ADDED ulex/dbmgr.scm
Index: ulex/dbmgr.scm
==================================================================
--- /dev/null
+++ ulex/dbmgr.scm
@@ -0,0 +1,1131 @@
+;;======================================================================
+;; Copyright 2022, Matthew Welland.
+;;
+;; This file is part of Megatest.
+;;
+;; Megatest is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+;;
+;; Megatest is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with Megatest. If not, see .
+
+;;======================================================================
+
+(declare (unit dbmgrmod))
+
+(declare (uses ulex))
+(declare (uses apimod))
+(declare (uses pkts))
+(declare (uses commonmod))
+(declare (uses dbmod))
+(declare (uses mtargs))
+(declare (uses portloggermod))
+(declare (uses debugprint))
+
+(module dbmgrmod
+ *
+
+(import scheme
+ chicken.base
+ chicken.condition
+ chicken.file
+ chicken.format
+ chicken.port
+ chicken.process
+ chicken.process-context
+ chicken.process-context.posix
+ chicken.sort
+ chicken.string
+ chicken.time
+
+ (prefix sqlite3 sqlite3:)
+ matchable
+ md5
+ message-digest
+ regex
+ s11n
+ srfi-1
+ srfi-18
+ srfi-69
+ system-information
+ typed-records
+
+ pkts
+ ulex
+
+ commonmod
+ apimod
+ dbmod
+ debugprint
+ (prefix mtargs args:)
+ portloggermod
+ )
+
+;; Configurations for server
+;; (tcp-buffer-size 2048)
+;; (max-connections 2048)
+
+;; info about me as a listener and my connections to db servers
+;; stored (for now) in *db-serv-info*
+;;
+(defstruct servdat
+ (host #f)
+ (port #f)
+ (uuid #f)
+ (dbfile #f)
+ (uconn #f) ;; this is the listener *FOR THIS PROCESS*
+ (mode #f)
+ (status 'starting)
+ (trynum 0) ;; count the number of ports we've tried
+ (conns (make-hash-table)) ;; apath/dbname => conndat
+ )
+
+(define *db-serv-info* (make-servdat))
+
+(define (servdat->url sdat)
+ (conc (servdat-host sdat)":"(servdat-port sdat)))
+
+;; db servers contact info
+;;
+(defstruct conndat
+ (apath #f)
+ (dbname #f)
+ (fullname #f)
+ (hostport #f)
+ (ipaddr #f)
+ (port #f)
+ (srvpkt #f)
+ (srvkey #f)
+ (lastmsg 0)
+ (expires 0))
+
+(define *srvpktspec*
+ `((server (host . h)
+ (port . p)
+ (servkey . k)
+ (pid . i)
+ (ipaddr . a)
+ (dbpath . d))))
+
+;;======================================================================
+;; S U P P O R T F U N C T I O N S
+;;======================================================================
+
+;; set up the api proc, seems like there should be a better place for this?
+;;
+;; IS THIS NEEDED ANYMORE? TODO - REMOVE IF POSSIBLE
+;;
+;; (define api-proc (make-parameter conc))
+;; (api-proc api:execute-requests)
+
+;; do we have a connection to apath dbname and
+;; is it not expired? then return it
+;;
+;; else setup a connection
+;;
+;; if that fails, return '(#f "some reason") ;; NB// convert to raising an exception
+;;
+(define (rmt:get-conn remdat apath dbname)
+ (let* ((fullname (db:dbname->path apath dbname)))
+ (hash-table-ref/default (servdat-conns remdat) fullname #f)))
+
+(define (rmt:drop-conn remdat apath dbname)
+ (let* ((fullname (db:dbname->path apath dbname)))
+ (hash-table-delete! (servdat-conns remdat) fullname)))
+
+(define (rmt:find-main-server uconn apath dbname)
+ (let* ((pktsdir (get-pkts-dir apath))
+ (all-srvpkts (get-all-server-pkts pktsdir *srvpktspec*))
+ (viable-srvs (get-viable-servers all-srvpkts dbname)))
+ (get-the-server uconn apath viable-srvs)))
+
+
+(define *connstart-mutex* (make-mutex))
+(define *last-main-start* 0)
+
+;; looks for a connection to main, returns if have and not exired
+;; creates new otherwise
+;;
+;; connections for other servers happens by requesting from main
+;;
+;; TODO: This is unnecessarily re-creating the record in the hash table
+;;
+(define (rmt:open-main-connection remdat apath)
+ (let* ((fullpath (db:dbname->path apath ".db/main.db"))
+ (conns (servdat-conns remdat))
+ (conn (rmt:get-conn remdat apath ".db/main.db")) ;; (hash-table-ref/default conns fullpath #f)) ;; TODO - create call for this
+ (start-rmt:run (lambda ()
+ (let* ((th1 (make-thread (lambda ()(rmt:run (get-host-name))) "non-db mode server")))
+ (thread-start! th1)
+ (thread-sleep! 1)
+ (let loop ((count 0))
+ (assert (< count 30) "FATAL: responder failed to initialize in rmt:open-main-connection")
+ (if (or (not *db-serv-info*)
+ (not (servdat-uconn *db-serv-info*)))
+ (begin
+ (thread-sleep! 1)
+ (loop (+ count 1)))
+ (begin
+ (servdat-mode-set! *db-serv-info* 'non-db)
+ (servdat-uconn *db-serv-info*)))))))
+ (myconn (servdat-uconn *db-serv-info*)))
+ (cond
+ ((not myconn)
+ (start-rmt:run)
+ (rmt:open-main-connection remdat apath))
+ ((and conn ;; conn is NOT a socket, just saying ...
+ (< (current-seconds) (conndat-expires conn)))
+ #t) ;; we are current and good to go - we'll deal elsewhere with a server that was killed or died
+ ((and conn
+ (>= (current-seconds)(conndat-expires conn)))
+ (debug:print-info 0 *default-log-port* "connection to "fullpath" server expired. Reconnecting.")
+ (rmt:drop-conn remdat apath ".db/main.db") ;;
+ (rmt:open-main-connection remdat apath))
+ (else
+ ;; Below we will find or create and connect to main
+ (debug:print-info 0 *default-log-port* "rmt:open-main-connection - starting from scratch")
+ (let* ((dbname (db:run-id->dbname #f))
+ (the-srv (rmt:find-main-server myconn apath dbname))
+ (start-main-srv (lambda () ;; call IF there is no the-srv found
+ (mutex-lock! *connstart-mutex*)
+ (if (> (- (current-seconds) *last-main-start*) 5) ;; at least four seconds since last attempt to start main server
+ (begin
+ (api:run-server-process apath dbname)
+ (set! *last-main-start* (current-seconds))
+ (thread-sleep! 1))
+ (thread-sleep! 0.25))
+ (mutex-unlock! *connstart-mutex*)
+ (rmt:open-main-connection remdat apath) ;; TODO: Add limit to number of tries
+ )))
+ (if (not the-srv) ;; have server, try connecting to it
+ (start-main-srv)
+ (let* ((srv-addr (server-address the-srv)) ;; need serv
+ (ipaddr (alist-ref 'ipaddr the-srv))
+ (port (alist-ref 'port the-srv))
+ (srvkey (alist-ref 'servkey the-srv))
+ (fullpath (db:dbname->path apath dbname))
+
+ (new-the-srv (make-conndat
+ apath: apath
+ dbname: dbname
+ fullname: fullpath
+ hostport: srv-addr
+ ;; socket: (open-nn-connection srv-addr) - TODO - open ulex connection?
+ ipaddr: ipaddr
+ port: port
+ srvpkt: the-srv
+ srvkey: srvkey ;; generated by rmt:get-signature on the server side
+ lastmsg: (current-seconds)
+ expires: (+ (current-seconds)
+ (server:expiration-timeout)
+ -2) ;; this needs to be gathered during the ping
+ )))
+ (hash-table-set! conns fullpath new-the-srv)))
+ #t)))))
+
+;; NB// sinfo is a servdat struct
+;;
+(define (rmt:general-open-connection sinfo apath dbname #!key (num-tries 5))
+ (assert (not (equal? dbname ".db/main.db")) "ERROR: general-open-connection should never be called with main as the db")
+ (let* ((mdbname ".db/main.db") ;; (db:run-id->dbname #f)) TODO: put this back to the lookup when stable
+ (fullname (db:dbname->path apath dbname))
+ (conns (servdat-conns sinfo))
+ (mconn (rmt:get-conn sinfo apath ".db/main.db"))
+ (dconn (rmt:get-conn sinfo apath dbname)))
+ #;(if (and mconn
+ (not (debug:print-logger)))
+ (begin
+ (debug:print-info 0 *default-log-port* "Turning on logging to main, look in logs dir for main log.")
+ (debug:print-logger rmt:log-to-main)))
+ (cond
+ ((and mconn
+ dconn
+ (< (current-seconds)(conndat-expires dconn)))
+ #t) ;; good to go
+ ((not mconn) ;; no channel open to main? open it...
+ (rmt:open-main-connection sinfo apath)
+ (rmt:general-open-connection sinfo apath dbname num-tries: (- num-tries 1)))
+ ((not dconn) ;; no channel open to dbname?
+ (let* ((res (rmt:send-receive-real sinfo apath mdbname 'get-server `(,apath ,dbname))))
+ (case res
+ ((server-started)
+ (if (> num-tries 0)
+ (begin
+ (thread-sleep! 2)
+ (rmt:general-open-connection sinfo apath dbname num-tries: (- num-tries 1)))
+ (begin
+ (debug:print-error 0 *default-log-port* "Failed to start servers needed or open channel to "apath", "dbname)
+ (exit 1))))
+ (else
+ (if (list? res) ;; server has been registered and the info was returned. pass it on.
+ (begin ;; ("192.168.0.9" 53817
+ ;; "5e34239f48e8973b3813221e54701a01" "24310"
+ ;; "192.168.0.9"
+ ;; "/home/matt/data/megatest/tests/simplerun"
+ ;; ".db/1.db")
+ (match
+ res
+ ((host port servkey pid ipaddr apath dbname)
+ (debug:print-info 0 *default-log-port* "got "res)
+ (hash-table-set! conns
+ fullname
+ (make-conndat
+ apath: apath
+ dbname: dbname
+ hostport: (conc host":"port)
+ ;; socket: (open-nn-connection (conc host":"port)) ;; TODO - open ulex connection?
+ ipaddr: ipaddr
+ port: port
+ srvkey: servkey
+ lastmsg: (current-seconds)
+ expires: (+ (current-seconds)
+ (server:expiration-timeout)
+ -2))))
+ (else
+ (debug:print-info 0 *default-log-port* "return data from starting server did not match host port servkey pid ipaddr apath dbname " res)))
+ res)
+ (begin
+ (debug:print-info 0 *default-log-port* "Unexpected result: " res)
+ res)))))))
+ #t))
+
+;;======================================================================
+
+;; FOR DEBUGGING SET TO #t
+;; (define *localmode* #t)
+(define *localmode* #f)
+(define *dbstruct* (make-dbr:dbstruct))
+
+;; Defaults to current area
+;;
+(define (rmt:send-receive cmd rid params #!key (attemptnum 1)(area-dat #f))
+ (let* ((apath *toppath*)
+ (sinfo *db-serv-info*)
+ (dbname (db:run-id->dbname rid)))
+ (if *localmode*
+ (api:execute-requests *dbstruct* cmd params)
+ (begin
+ (rmt:open-main-connection sinfo apath)
+ (if rid (rmt:general-open-connection sinfo apath dbname))
+ #;(if (not (member cmd '(log-to-main)))
+ (debug:print-info 0 *default-log-port* "rmt:send-receive "cmd" params="params))
+ (rmt:send-receive-real sinfo apath dbname cmd params)))))
+
+;; db is at apath/.db/dbname, rid is an intermediary solution and will be removed
+;; sometime in the future
+;;
+(define (rmt:send-receive-real sinfo apath dbname cmd params)
+ (assert (not (eq? 'primordial (thread-name (current-thread)))) "FATAL: Do not call rmt:send-receive-real in the primodial thread.")
+ (let* ((cdat (rmt:get-conn sinfo apath dbname)))
+ (assert cdat "FATAL: rmt:send-receive-real called without the needed channels opened")
+ (let* ((uconn (servdat-uconn sinfo)) ;; get the interface to ulex
+ ;; then send-receive using the ulex layer to host-port stored in cdat
+ (res (send-receive uconn (conndat-hostport cdat) cmd params))
+ #;(th1 (make-thread (lambda ()
+ (set! res (send-receive uconn (conndat-hostport cdat) cmd params)))
+ "send-receive thread")))
+ ;; (thread-start! th1)
+ ;; (thread-join! th1) ;; gratuitious thread stuff is so that mailbox is not used in primordial thead
+ ;; since we accessed the server we can bump the expires time up
+ (conndat-expires-set! cdat (+ (current-seconds)
+ (server:expiration-timeout)
+ -10)) ;; ten second margin for network time misalignments etc.
+ res)))
+
+;; db is at apath/.db/dbname, rid is an intermediary solution and will be removed
+;; sometime in the future.
+;;
+;; Purpose - call the main.db server and request a server be started
+;; for the given area path and dbname
+;;
+
+(define (rmt:print-db-stats)
+ (let ((fmtstr "~40a~7-d~9-d~20,2-f")) ;; "~20,2-f"
+ (debug:print 18 *default-log-port* "DB Stats, "(seconds->year-week/day-time (current-seconds))"\n=====================")
+ (debug:print 18 *default-log-port* (format #f "~40a~8a~10a~10a" "Cmd" "Count" "TotTime" "Avg"))
+ (for-each (lambda (cmd)
+ (let ((cmd-dat (hash-table-ref *db-stats* cmd)))
+ (debug:print 18 *default-log-port* (format #f fmtstr cmd (vector-ref cmd-dat 0) (vector-ref cmd-dat 1) (/ (vector-ref cmd-dat 1)(vector-ref cmd-dat 0))))))
+ (sort (hash-table-keys *db-stats*)
+ (lambda (a b)
+ (> (vector-ref (hash-table-ref *db-stats* a) 0)
+ (vector-ref (hash-table-ref *db-stats* b) 0)))))))
+
+(define (rmt:get-max-query-average run-id)
+ (mutex-lock! *db-stats-mutex*)
+ (let* ((runkey (conc "run-id=" run-id " "))
+ (cmds (filter (lambda (x)
+ (substring-index runkey x))
+ (hash-table-keys *db-stats*)))
+ (res (if (null? cmds)
+ (cons 'none 0)
+ (let loop ((cmd (car cmds))
+ (tal (cdr cmds))
+ (max-cmd (car cmds))
+ (res 0))
+ (let* ((cmd-dat (hash-table-ref *db-stats* cmd))
+ (tot (vector-ref cmd-dat 0))
+ (curravg (/ (vector-ref cmd-dat 1) (vector-ref cmd-dat 0))) ;; count is never zero by construction
+ (currmax (max res curravg))
+ (newmax-cmd (if (> curravg res) cmd max-cmd)))
+ (if (null? tal)
+ (if (> tot 10)
+ (cons newmax-cmd currmax)
+ (cons 'none 0))
+ (loop (car tal)(cdr tal) newmax-cmd currmax)))))))
+ (mutex-unlock! *db-stats-mutex*)
+ res))
+
+;; host and port are used to ensure we are remove proper records
+(define (rmt:server-shutdown host port)
+ (let ((dbfile (servdat-dbfile *db-serv-info*)))
+ (debug:print-info 0 *default-log-port* "dbfile is "dbfile)
+ (if dbfile
+ (let* ((am-server (args:get-arg "-server"))
+ (dbfile (args:get-arg "-db"))
+ (apath *toppath*)
+ #;(sinfo *remotedat*)) ;; foundation for future fix
+ (if *dbstruct-db*
+ (let* ((dbdat (db:get-dbdat *dbstruct-db* apath dbfile))
+ (db (dbr:dbdat-db dbdat))
+ (inmem (dbr:dbdat-db dbdat)) ;; WRONG
+ )
+ ;; do a final sync here
+ (debug:print-info 0 *default-log-port* "Doing final sync for "apath" "dbfile" at "(current-seconds))
+ (db:sync-inmem->disk *dbstruct-db* apath dbfile force-sync: #t)
+ ;; let's finalize here
+ (debug:print-info 0 *default-log-port* "Finalizing db and inmem")
+ (if (sqlite3:database? db)
+ (sqlite3:finalize! db)
+ (debug:print-info 0 *default-log-port* "in rmt:server-shutdown, db is not a database, not finalizing..."))
+ (if (sqlite3:database? inmem)
+ (sqlite3:finalize! inmem)
+ (debug:print-info 0 *default-log-port* "in rmt:server-shutdown, inmem is not a database, not finalizing..."))
+ (debug:print-info 0 *default-log-port* "Finalizing db and inmem complete"))
+ (debug:print-info 0 *default-log-port* "Db was never opened, no cleanup to do."))
+ (if (not am-server)
+ (debug:print-info 0 *default-log-port* "I am not a server, should NOT get here!")
+ (if (string-match ".*/main.db$" dbfile)
+ (let ((pkt-file (conc (get-pkts-dir *toppath*)
+ "/" (servdat-uuid *db-serv-info*)
+ ".pkt")))
+ (debug:print-info 0 *default-log-port* "removing pkt "pkt-file)
+ (delete-file* pkt-file)
+ (debug:print-info 0 *default-log-port* "Releasing lock (if any) for "dbfile ", host "host", port "port)
+ (db:with-lock-db
+ (servdat-dbfile *db-serv-info*)
+ (lambda (dbh dbfile)
+ (db:release-lock dbh dbfile host port)))) ;; I'm not the server - should not have a lock to remove
+ (let* ((sdat *db-serv-info*) ;; we have a run-id server
+ (host (servdat-host sdat))
+ (port (servdat-port sdat))
+ (uuid (servdat-uuid sdat))
+ (res (rmt:deregister-server *db-serv-info* *toppath* host port uuid dbfile)))
+ (debug:print-info 0 *default-log-port* "deregistered-server, res="res)
+ (debug:print-info 0 *default-log-port* "deregistering server "host":"port" with uuid "uuid)
+ )))))))
+
+
+(define (common:run-sync?)
+ ;; (and (common:on-homehost?)
+ (args:get-arg "-server"))
+
+(define *rmt:run-mutex* (make-mutex))
+(define *rmt:run-flag* #f)
+
+;; Main entry point to start a server. was start-server
+(define (rmt:run hostn)
+ (mutex-lock! *rmt:run-mutex*)
+ (if *rmt:run-flag*
+ (begin
+ (debug:print-warn 0 *default-log-port* "rmt:run already running.")
+ (mutex-unlock! *rmt:run-mutex*))
+ (begin
+ (set! *rmt:run-flag* #t)
+ (mutex-unlock! *rmt:run-mutex*)
+ ;; ;; Configurations for server
+ ;; (tcp-buffer-size 2048)
+ ;; (max-connections 2048)
+ (debug:print 2 *default-log-port* "PID: "(current-process-id)". Attempting to start the server ...")
+ (if (and *db-serv-info*
+ (servdat-uconn *db-serv-info*))
+ (let* ((uconn (servdat-uconn *db-serv-info*)))
+ (wait-and-close uconn))
+ (let* ((port (portlogger:open-run-close portlogger:find-port))
+ (handler-proc (lambda (rem-host-port qrykey cmd params) ;;
+ (set! *db-last-access* (current-seconds))
+ (assert (list? params) "FATAL: handler called with non-list params")
+ (assert (args:get-arg "-server") "FATAL: handler called on non-server side. cmd="cmd", params="params)
+ (debug:print 0 *default-log-port* "handler call: "cmd", params="params)
+ (api:execute-requests *dbstruct-db* cmd params))))
+ ;; (api:process-request *dbstuct-db*
+ (if (not *db-serv-info*)
+ (set! *db-serv-info* (make-servdat host: hostn port: port)))
+ (let* ((uconn (run-listener handler-proc port))
+ (rport (udat-port uconn))) ;; the real port
+ (servdat-host-set! *db-serv-info* hostn)
+ (servdat-port-set! *db-serv-info* rport)
+ (servdat-uconn-set! *db-serv-info* uconn)
+ (wait-and-close uconn)
+ (db:print-current-query-stats)
+ )))
+ (let* ((host (servdat-host *db-serv-info*))
+ (port (servdat-port *db-serv-info*))
+ (mode (or (servdat-mode *db-serv-info*)
+ "non-db")))
+ ;; server exit stuff here
+ ;; (rmt:server-shutdown host port) - always do in on-exit
+ ;; (portlogger:open-run-close portlogger:set-port port "released") ;; moved to on-exit
+ (debug:print-info 0 *default-log-port* "Server "host":"port" mode "mode"shutdown complete. Exiting")
+ ))))
+
+;;======================================================================
+;; S E R V E R U T I L I T I E S
+;;======================================================================
+
+
+;;======================================================================
+;; NEW SERVER METHOD
+;;======================================================================
+
+;; only use for main.db - need to re-write some of this :(
+;;
+(define (get-lock-db sdat dbfile host port)
+ (assert host "FATAL: get-lock-db called with host not set.")
+ (assert port "FATAL: get-lock-db called with port not set.")
+ (let* ((dbh (db:open-run-db dbfile db:initialize-db)) ;; open-run-db creates a standard db with schema used by all situations
+ (res (db:get-iam-server-lock dbh dbfile host port))
+ (uconn (servdat-uconn sdat)))
+ ;; res => list then already locked, check server is responsive
+ ;; => #t then sucessfully got the lock
+ ;; => #f reserved for future use as to indicate something went wrong
+ (match res
+ ((owner_pid owner_host owner_port event_time)
+ (if (server-ready? uconn (conc owner_host":"owner_port) "abc")
+ #f ;; locked by someone else
+ (begin ;; locked by someone dead and gone
+ (debug:print 0 *default-log-port* "WARNING: stale lock - have to steal it. This may fail.")
+ (db:steal-lock-db dbh dbfile port))))
+ (#t #t) ;; placeholder so that we don't touch res if it is #t
+ (else (set! res #f)))
+ (sqlite3:finalize! dbh)
+ res))
+
+
+(define (register-server pkts-dir pkt-spec host port servkey ipaddr dbpath)
+ (let* ((pkt-dat `((host . ,host)
+ (port . ,port)
+ (servkey . ,servkey)
+ (pid . ,(current-process-id))
+ (ipaddr . ,ipaddr)
+ (dbpath . ,dbpath)))
+ (uuid (write-alist->pkt
+ pkts-dir
+ pkt-dat
+ pktspec: pkt-spec
+ ptype: 'server)))
+ (debug:print 0 *default-log-port* "Server on "host":"port" registered in pkt "uuid)
+ uuid))
+
+(define (get-pkts-dir #!optional (apath #f))
+ (let* ((effective-toppath (or *toppath* apath)))
+ (assert effective-toppath
+ "ERROR: get-pkts-dir called without *toppath* set. Exiting.")
+ (let* ((pdir (conc effective-toppath "/.meta/srvpkts")))
+ (if (file-exists? pdir)
+ pdir
+ (begin
+ (handle-exceptions ;; this exception handler should NOT be needed but ...
+ exn
+ pdir
+ (create-directory pdir #t))
+ pdir)))))
+
+;; given a pkts dir read
+;;
+(define (get-all-server-pkts pktsdir-in pktspec)
+ (let* ((pktsdir (if (file-exists? pktsdir-in)
+ pktsdir-in
+ (begin
+ (create-directory pktsdir-in #t)
+ pktsdir-in)))
+ (all-pkt-files (glob (conc pktsdir "/*.pkt"))))
+ (map (lambda (pkt-file)
+ (read-pkt->alist pkt-file pktspec: pktspec))
+ all-pkt-files)))
+
+(define (server-address srv-pkt)
+ (conc (alist-ref 'host srv-pkt) ":"
+ (alist-ref 'port srv-pkt)))
+
+(define (server-ready? uconn host-port key) ;; server-address is host:port
+ (let* ((params `((cmd . ping)(key . ,key)))
+ (data `((cmd . ping)
+ (key . ,key)
+ (params . ,params))) ;; I don't get it.
+ (res (send-receive uconn host-port 'ping data)))
+ (if (eq? res 'ack) ;; yep, likely it is who we want on the other end
+ res
+ #f)))
+;; (begin (debug:print-info 0 *default-log-port* "server-ready? => "res) #f))))
+
+; from the pkts return servers associated with dbpath
+;; NOTE: Only one can be alive - have to check on each
+;; in the list of pkts returned
+;;
+(define (get-viable-servers serv-pkts dbpath)
+ (let loop ((tail serv-pkts)
+ (res '()))
+ (if (null? tail)
+ res ;; NOTE: sort by age so oldest is considered first
+ (let* ((spkt (car tail)))
+ (loop (cdr tail)
+ (if (equal? dbpath (alist-ref 'dbpath spkt))
+ (cons spkt res)
+ res))))))
+
+(define (remove-pkts-if-not-alive uconn serv-pkts)
+ (filter (lambda (pkt)
+ (let* ((host (alist-ref 'host pkt))
+ (port (alist-ref 'port pkt))
+ (host-port (conc host":"port))
+ (key (alist-ref 'servkey pkt))
+ (pktz (alist-ref 'Z pkt))
+ (res (server-ready? uconn host-port key)))
+ (if res
+ res
+ (let* ((pktsdir (get-pkts-dir *toppath*))
+ (pktpath (conc pktsdir"/"pktz".pkt")))
+ (debug:print 0 *default-log-port* "WARNING: pkt with no server "pktpath)
+ (delete-file* pktpath)
+ #f))))
+ serv-pkts))
+
+;; from viable servers get one that is alive and ready
+;;
+(define (get-the-server uconn apath serv-pkts)
+ (let loop ((tail serv-pkts))
+ (if (null? tail)
+ #f
+ (let* ((spkt (car tail))
+ (host (alist-ref 'ipaddr spkt))
+ (port (alist-ref 'port spkt))
+ (host-port (conc host":"port))
+ (dbpth (alist-ref 'dbpath spkt))
+ (srvkey (alist-ref 'Z spkt)) ;; (alist-ref 'srvkey spkt))
+ (addr (server-address spkt)))
+ (if (server-ready? uconn host-port srvkey)
+ spkt
+ (loop (cdr tail)))))))
+
+;; am I the "first" in line server? I.e. my D card is smallest
+;; use Z card as tie breaker
+;;
+(define (get-best-candidate serv-pkts dbpath)
+ (if (null? serv-pkts)
+ #f
+ (let loop ((tail serv-pkts)
+ (best (car serv-pkts)))
+ (if (null? tail)
+ best
+ (let* ((candidate (car tail))
+ (candidate-bd (string->number (alist-ref 'D candidate)))
+ (best-bd (string->number (alist-ref 'D best)))
+ ;; bigger number is younger
+ (candidate-z (alist-ref 'Z candidate))
+ (best-z (alist-ref 'Z best))
+ (new-best (cond
+ ((> best-bd candidate-bd) ;; best is younger than candidate
+ candidate)
+ ((< best-bd candidate-bd) ;; candidate is younger than best
+ best)
+ (else
+ (if (string>=? best-z candidate-z)
+ best
+ candidate))))) ;; use Z card as tie breaker
+ (if (null? tail)
+ new-best
+ (loop (cdr tail) new-best)))))))
+
+
+;;======================================================================
+;; END NEW SERVER METHOD
+;;======================================================================
+
+;; if .db/main.db check the pkts
+;;
+(define (rmt:wait-for-server pkts-dir db-file server-key)
+ (let* ((sdat *db-serv-info*))
+ (let loop ((start-time (current-seconds))
+ (changed #t)
+ (last-sdat "not this"))
+ (begin ;; let ((sdat #f))
+ (thread-sleep! 0.01)
+ (debug:print-info 0 *default-log-port* "Waiting for server alive signature")
+ (mutex-lock! *heartbeat-mutex*)
+ (set! sdat *db-serv-info*)
+ (mutex-unlock! *heartbeat-mutex*)
+ (if (and sdat
+ (not changed)
+ (> (- (current-seconds) start-time) 2))
+ (let* ((uconn (servdat-uconn sdat)))
+ (servdat-status-set! sdat 'iface-stable)
+ (debug:print-info 0 *default-log-port* "Received server alive signature, now attempting to lock in server")
+ ;; create a server pkt in *toppath*/.meta/srvpkts
+
+ ;; TODO:
+ ;; 1. change sdat to stuct
+ ;; 2. add uuid to struct
+ ;; 3. update uuid in sdat here
+ ;;
+ (servdat-uuid-set! sdat
+ (register-server
+ pkts-dir *srvpktspec*
+ (get-host-name)
+ (servdat-port sdat) server-key
+ (servdat-host sdat) db-file))
+ ;; (set! *my-signature* (servdat-uuid sdat)) ;; replace with Z, no, stick with proper key
+ ;; now read pkts and see if we are a contender
+ (let* ((all-pkts (get-all-server-pkts pkts-dir *srvpktspec*))
+ (viables (get-viable-servers all-pkts db-file))
+ (alive (remove-pkts-if-not-alive uconn viables))
+ (best-srv (get-best-candidate alive db-file))
+ (best-srv-key (if best-srv (alist-ref 'servkey best-srv) #f))
+ (i-am-srv (equal? best-srv-key server-key))
+ (delete-pkt (lambda ()
+ (let* ((pktfile (conc (get-pkts-dir *toppath*)
+ "/" (servdat-uuid *db-serv-info*)
+ ".pkt")))
+ (debug:print-info 0 *default-log-port* "Attempting to remove bogus pkt file "pktfile)
+ (delete-file* pktfile))))) ;; remove immediately instead of waiting for on-exit
+ (debug:print 0 *default-log-port* "best-srv-key: "best-srv-key", server-key: "server-key", i-am-srv: "i-am-srv)
+ ;; am I the best-srv, compare server-keys to know
+ (if i-am-srv
+ (if (get-lock-db sdat db-file (servdat-host sdat)(servdat-port sdat)) ;; (db:get-iam-server-lock *dbstruct-db* *toppath* run-id)
+ (begin
+ (debug:print-info 0 *default-log-port* "I'm the server!")
+ (servdat-dbfile-set! sdat db-file)
+ (servdat-status-set! sdat 'db-locked))
+ (begin
+ (debug:print-info 0 *default-log-port* "I'm not the server, exiting.")
+ (bdat-time-to-exit-set! *bdat* #t)
+ (delete-pkt)
+ (thread-sleep! 0.2)
+ (exit)))
+ (begin
+ (debug:print-info 0 *default-log-port*
+ "Keys do not match "best-srv-key", "server-key", exiting.")
+ (bdat-time-to-exit-set! *bdat* #t)
+ (delete-pkt)
+ (thread-sleep! 0.2)
+ (exit)))
+ sdat))
+ (begin ;; sdat not yet contains server info
+ (debug:print-info 0 *default-log-port* "Still waiting, last-sdat=" last-sdat)
+ (sleep 4)
+ (if (> (- (current-seconds) start-time) 120) ;; been waiting for two minutes
+ (begin
+ (debug:print-error 0 *default-log-port* "transport appears to have died, exiting server")
+ (exit))
+ (loop start-time
+ (equal? sdat last-sdat)
+ sdat))))))))
+
+(define (rmt:register-server sinfo apath iface port server-key dbname)
+ (servdat-conns sinfo) ;; just checking types
+ (rmt:open-main-connection sinfo apath) ;; we need a channel to main.db
+ (rmt:send-receive-real sinfo apath ;; params: host port servkey pid ipaddr dbpath
+ (db:run-id->dbname #f)
+ 'register-server `(,iface
+ ,port
+ ,server-key
+ ,(current-process-id)
+ ,iface
+ ,apath
+ ,dbname)))
+
+(define (rmt:get-count-servers sinfo apath)
+ (servdat-conns sinfo) ;; just checking types
+ (rmt:open-main-connection sinfo apath) ;; we need a channel to main.db
+ (rmt:send-receive-real sinfo apath ;; params: host port servkey pid ipaddr dbpath
+ (db:run-id->dbname #f)
+ 'get-count-servers `(,apath)))
+
+(define (rmt:get-servers-info apath)
+ (rmt:send-receive 'get-servers-info #f `(,apath)))
+
+(define (rmt:deregister-server db-serv-info apath iface port server-key dbname)
+ (rmt:open-main-connection db-serv-info apath) ;; we need a channel to main.db
+ (rmt:send-receive-real db-serv-info apath ;; params: host port servkey pid ipaddr dbpath
+ (db:run-id->dbname #f)
+ 'deregister-server `(,iface
+ ,port
+ ,server-key
+ ,(current-process-id)
+ ,iface
+ ,apath
+ ,dbname)))
+
+(define (rmt:wait-for-stable-interface #!optional (num-tries-allowed 100))
+ ;; wait until *db-serv-info* stops changing
+ (let* ((stime (current-seconds)))
+ (let loop ((last-host #f)
+ (last-port #f)
+ (tries 0))
+ (let* ((curr-host (and *db-serv-info* (servdat-host *db-serv-info*)))
+ (curr-port (and *db-serv-info* (servdat-port *db-serv-info*))))
+ ;; first we verify port and interface, update *db-serv-info* in need be.
+ (cond
+ ((> tries num-tries-allowed)
+ (debug:print 0 *default-log-port* "rmt:keep-running, giving up after trying for several minutes.")
+ (exit 1))
+ ((not *db-serv-info*)
+ (thread-sleep! 0.25)
+ (loop curr-host curr-port (+ tries 1)))
+ ((or (not last-host)(not last-port))
+ (debug:print 0 *default-log-port* "rmt:keep-running, still no interface, tries="tries)
+ (thread-sleep! 0.25)
+ (loop curr-host curr-port (+ tries 1)))
+ ((or (not (equal? last-host curr-host))
+ (not (equal? last-port curr-port)))
+ (debug:print-info 0 *default-log-port* "WARNING: interface changed, refreshing iface and port info")
+ (thread-sleep! 0.25)
+ (loop curr-host curr-port (+ tries 1)))
+ ((< (- (current-seconds) stime) 1) ;; keep up the looping until at least 3 seconds have passed
+ (thread-sleep! 0.5)
+ (loop curr-host curr-port (+ tries 1)))
+ (else
+ (rmt:get-signature) ;; sets *my-signature* as side effect
+ (servdat-status-set! *db-serv-info* 'interface-stable)
+ (debug:print 0 *default-log-port*
+ "SERVER STARTED: " curr-host
+ ":" curr-port
+ " AT " (current-seconds) " server signature: " *my-signature*
+ " with "(servdat-trynum *db-serv-info*)" port changes")
+ (flush-output *default-log-port*)
+ #t))))))
+
+;; run rmt:keep-running in a parallel thread to monitor that the db is being
+;; used and to shutdown after sometime if it is not.
+;;
+(define (rmt:keep-running dbname)
+ ;; if none running or if > 20 seconds since
+ ;; server last used then start shutdown
+ ;; This thread waits for the server to come alive
+ (debug:print-info 0 *default-log-port* "Starting the sync-back, keep alive thread in server")
+
+ (let* ((sinfo *db-serv-info*)
+ (server-start-time (current-seconds))
+ (pkts-dir (get-pkts-dir))
+ (server-key (rmt:get-signature)) ;; This servers key
+ (is-main (equal? (args:get-arg "-db") ".db/main.db"))
+ (last-access 0)
+ (server-timeout (server:expiration-timeout))
+ (shutdown-server-sequence (lambda (host port)
+ (set! *unclean-shutdown* #f) ;; Should not be needed anymore
+ (debug:print-info 0 *default-log-port* "Starting to shutdown the server. pid="(current-process-id))
+ ;; (rmt:server-shutdown host port) -- called in on-exit
+ ;; (portlogger:open-run-close portlogger:set-port port "released") called in on-exit
+ (exit)))
+ (timed-out? (lambda ()
+ (<= (+ last-access server-timeout)
+ (current-seconds)))))
+ (servdat-dbfile-set! *db-serv-info* (args:get-arg "-db"))
+ ;; main and run db servers have both got wait logic (could/should merge it)
+ (if is-main
+ (rmt:wait-for-server pkts-dir dbname server-key)
+ (rmt:wait-for-stable-interface))
+ ;; this is our forever loop
+ (let* ((iface (servdat-host *db-serv-info*))
+ (port (servdat-port *db-serv-info*))
+ (uconn (servdat-uconn *db-serv-info*)))
+ (let loop ((count 0)
+ (bad-sync-count 0)
+ (start-time (current-milliseconds)))
+ (if (and (not is-main)
+ (common:low-noise-print 60 "servdat-status"))
+ (debug:print-info 0 *default-log-port* "servdat-status is " (servdat-status *db-serv-info*)))
+
+ (mutex-lock! *heartbeat-mutex*)
+ ;; set up the database handle
+ (if (not *dbstruct-db*) ;; no db opened yet, open the db and register with main if appropriate
+ (let ((watchdog (bdat-watchdog *bdat*)))
+ (debug:print 0 *default-log-port* "SERVER: dbprep")
+ (db:setup dbname) ;; sets *dbstruct-db* as side effect
+ (servdat-status-set! *db-serv-info* 'db-opened)
+ ;; IFF I'm not main, call into main and register self
+ (if (not is-main)
+ (let ((res (rmt:register-server sinfo
+ *toppath* iface port
+ server-key dbname)))
+ (if res ;; we are the server
+ (servdat-status-set! *db-serv-info* 'have-interface-and-db)
+ ;; now check that the db locker is alive, clear it out if not
+ (let* ((serv-info (rmt:server-info *toppath* dbname)))
+ (match serv-info
+ ((host port servkey pid ipaddr apath dbpath)
+ (if (not (server-ready? uconn (conc host":"port) servkey))
+ (begin
+ (debug:print-info 0 *default-log-port* "Server registered but not alive. Removing and trying again.")
+ (rmt:deregister-server sinfo apath host port servkey dbpath) ;; servkey pid ipaddr apath dbpath)
+ (loop (+ count 1) bad-sync-count start-time))))
+ (else
+ (debug:print 0 *default-log-port* "We are not the server for "dbname", exiting. Server info is: "serv-info)
+ (exit)))))))
+ (debug:print 0 *default-log-port*
+ "SERVER: running, db "dbname" opened, megatest version: "
+ (common:get-full-version))
+ ;; start the watchdog
+
+ ;; is this really needed?
+
+ #;(if watchdog
+ (if (not (member (thread-state watchdog)
+ '(ready running blocked
+ sleeping dead)))
+ (begin
+ (debug:print-info 0 *default-log-port* "Starting watchdog thread (in state "(thread-state watchdog)")")
+ (thread-start! watchdog))
+ (debug:print-info 0 *default-log-port* "Not starting watchdog thread (in state "(thread-state watchdog)")"))
+ (debug:print 0 *default-log-port* "ERROR: *watchdog* not setup, cannot start it."))
+ #;(loop (+ count 1) bad-sync-count start-time)
+ ))
+
+ (db:sync-inmem->disk *dbstruct-db* *toppath* dbname force-sync: #t)
+
+ (mutex-unlock! *heartbeat-mutex*)
+
+ ;; when things go wrong we don't want to be doing the various
+ ;; queries too often so we strive to run this stuff only every
+ ;; four seconds or so.
+ (let* ((sync-time (- (current-milliseconds) start-time))
+ (rem-time (quotient (- 4000 sync-time) 1000)))
+ (if (and (<= rem-time 4)
+ (> rem-time 0))
+ (thread-sleep! rem-time)))
+
+ ;; Transfer *db-last-access* to last-access to use in checking that we are still alive
+ (set! last-access *db-last-access*)
+
+ (if (< count 1) ;; 3x3 = 9 secs aprox
+ (loop (+ count 1) bad-sync-count (current-milliseconds)))
+
+ (if (common:low-noise-print 60 "dbstats")
+ (begin
+ (debug:print 0 *default-log-port* "Server stats:")
+ (db:print-current-query-stats)))
+ (let* ((hrs-since-start (/ (- (current-seconds) server-start-time) 3600)))
+ (cond
+ ((not *server-run*)
+ (debug:print-info 0 *default-log-port* "*server-run* set to #f. Shutting down.")
+ (shutdown-server-sequence (get-host-name) port))
+ ((timed-out?)
+ (debug:print-info 0 *default-log-port* "Server timed out. seconds since last db access: " (- (current-seconds) last-access))
+ (shutdown-server-sequence (get-host-name) port))
+ ((and *server-run*
+ (or (not (timed-out?))
+ (if is-main ;; do not exit if there are other servers (keep main open until all others gone)
+ (> (rmt:get-count-servers sinfo *toppath*) 1)
+ #f)))
+ (if (common:low-noise-print 120 "server continuing")
+ (debug:print-info 0 *default-log-port* "Server continuing, seconds since last db access: " (- (current-seconds) last-access)))
+ (loop 0 bad-sync-count (current-milliseconds)))
+ (else
+ (set! *unclean-shutdown* #f)
+ (debug:print-info 0 *default-log-port* "Server timed out. seconds since last db access: " (- (current-seconds) last-access))
+ (shutdown-server-sequence (get-host-name) port)
+ #;(debug:print-info 0 *default-log-port* "Sending 'quit to server, received: "
+ (open-send-receive-nn (conc iface":"port) ;; do this here and not in server-shutdown
+ (sexpr->string 'quit))))))))))
+
+(define (rmt:get-reasonable-hostname)
+ (let* ((inhost (or (args:get-arg "-server") "-")))
+ (if (equal? inhost "-")
+ (get-host-name)
+ inhost)))
+
+;; Call this to start the actual server
+;;
+;; all routes though here end in exit ...
+;;
+;; This is the point at which servers are started
+;;
+(define (rmt:server-launch dbname)
+ (debug:print-info 0 *default-log-port* "Entered rmt:server-launch")
+ (let* ((th2 (make-thread (lambda ()
+ (debug:print-info 0 *default-log-port* "Server run thread started")
+ (rmt:run (rmt:get-reasonable-hostname)))
+ "Server run"))
+ (th3 (make-thread (lambda ()
+ (debug:print-info 0 *default-log-port* "Server monitor thread started")
+ (if (args:get-arg "-server")
+ (rmt:keep-running dbname)))
+ "Keep running")))
+ (thread-start! th2)
+ (thread-sleep! 0.252) ;; give the server time to settle before starting the keep-running monitor.
+ (thread-start! th3)
+ (set! *didsomething* #t)
+ (thread-join! th2)
+ (thread-join! th3))
+ #f)
+
+;;======================================================================
+;; S E R V E R - D I R E C T C A L L S
+;;======================================================================
+
+(define (rmt:kill-server run-id)
+ (rmt:send-receive 'kill-server #f (list run-id)))
+
+(define (rmt:start-server run-id)
+ (rmt:send-receive 'start-server #f (list run-id)))
+
+(define (rmt:server-info apath dbname)
+ (rmt:send-receive 'get-server-info #f (list apath dbname)))
+
+;;======================================================================
+;; Nanomsg transport
+;;======================================================================
+
+#;(define (is-port-in-use port-num)
+ (let* ((ret #f))
+ (let-values (((inp oup pid)
+ (process "netstat" (list "-tulpn" ))))
+ (let loop ((inl (read-line inp)))
+ (if (not (eof-object? inl))
+ (begin
+ (if (string-search (regexp (conc ":" port-num)) inl)
+ (begin
+ ;(print "Output: " inl)
+ (set! ret #t))
+ (loop (read-line inp)))))))
+ ret))
+
+#;(define (open-nn-connection host-port)
+ (let ((req (make-req-socket))
+ (uri (conc "tcp://" host-port)))
+ (nng-dial req uri)
+ (socket-set! req 'nng/recvtimeo 2000)
+ req))
+
+#;(define (send-receive-nn req msg)
+ (nng-send req msg)
+ (nng-recv req))
+
+#;(define (close-nn-connection req)
+ (nng-close! req))
+
+;; ;; open connection to server, send message, close connection
+;; ;;
+;; (define (open-send-close-nn host-port msg #!key (timeout 3) ) ;; default timeout is 3 seconds
+;; (let ((req (make-req-socket 'req))
+;; (uri (conc "tcp://" host-port))
+;; (res #f)
+;; ;; (contacts (alist-ref 'contact attrib))
+;; ;; (mode (alist-ref 'mode attrib))
+;; )
+;; (socket-set! req 'nng/recvtimeo 2000)
+;; (handle-exceptions
+;; exn
+;; (let ((emsg ((condition-property-accessor 'exn 'message) exn)))
+;; ;; Send notification
+;; (debug:print 0 *default-log-port* "ERROR: Failed to connect / send to " uri " message was \"" emsg "\"" )
+;; #f)
+;; (nng-dial req uri)
+;; ;; (print "Connected to the server " )
+;; (nng-send req msg)
+;; ;; (print "Request Sent")
+;; (let* ((th1 (make-thread (lambda ()
+;; (let ((resp (nng-recv req)))
+;; (nng-close! req)
+;; (set! res (if (equal? resp "ok")
+;; #t
+;; #f))))
+;; "recv thread"))
+;; (th2 (make-thread (lambda ()
+;; (thread-sleep! timeout)
+;; (thread-terminate! th1))
+;; "timer thread")))
+;; (thread-start! th1)
+;; (thread-start! th2)
+;; (thread-join! th1)
+;; res))))
+;;
+#;(define (open-send-receive-nn host-port msg #!key (timeout 3) ) ;; default timeout is 3 seconds
+ (let ((req (make-req-socket))
+ (uri (conc "tcp://" host-port))
+ (res #f))
+ (handle-exceptions
+ exn
+ (let ((emsg ((condition-property-accessor 'exn 'message) exn)))
+ ;; Send notification
+ (debug:print 0 *default-log-port* "ERROR: Failed to connect / send to " uri " message was \"" emsg "\", exn=" exn)
+ #f)
+ (nng-dial req uri)
+ (nng-send req msg)
+ (let* ((th1 (make-thread (lambda ()
+ (let ((resp (nng-recv req)))
+ (nng-close! req)
+ ;; (print resp)
+ (set! res resp)))
+ "recv thread"))
+ (th2 (make-thread (lambda ()
+ (thread-sleep! timeout)
+ (thread-terminate! th1))
+ "timer thread")))
+ (thread-start! th1)
+ (thread-start! th2)
+ (thread-join! th1)
+ res))))
+
+;;======================================================================
+;; S E R V E R U T I L I T I E S
+;;======================================================================
+
+;; run ping in separate process, safest way in some cases
+;;
+#;(define (server:ping-server ifaceport)
+ (with-input-from-pipe
+ (conc (common:get-megatest-exe) " -ping " ifaceport)
+ (lambda ()
+ (let loop ((inl (read-line))
+ (res "NOREPLY"))
+ (if (eof-object? inl)
+ (case (string->symbol res)
+ ((NOREPLY) #f)
+ ((LOGIN_OK) #t)
+ (else #f))
+ (loop (read-line) inl))))))
+
+;; NOT USED (well, ok, reference in rpc-transport but otherwise not used).
+;;
+#;(define (server:login toppath)
+ (lambda (toppath)
+ (set! *db-last-access* (current-seconds)) ;; might not be needed.
+ (if (equal? *toppath* toppath)
+ #t
+ #f)))
+
+;; (define server:sync-lock-token "SERVER_SYNC_LOCK")
+;; (define (server:release-sync-lock)
+;; (db:no-sync-del! *no-sync-db* server:sync-lock-token))
+;; (define (server:have-sync-lock?)
+;; (let* ((have-lock-pair (db:no-sync-get-lock *no-sync-db* server:sync-lock-token))
+;; (have-lock? (car have-lock-pair))
+;; (lock-time (cdr have-lock-pair))
+;; (lock-age (- (current-seconds) lock-time)))
+;; (cond
+;; (have-lock? #t)
+;; ((>lock-age
+;; (* 3 (configf:lookup-number *configdat* "server" "minimum-intersync-delay" default: 180)))
+;; (server:release-sync-lock)
+;; (server:have-sync-lock?))
+;; (else #f))))
+
+)
Index: ulex/ulex.scm
==================================================================
--- ulex/ulex.scm
+++ ulex/ulex.scm
@@ -1,8 +1,8 @@
;; ulex: Distributed sqlite3 db
;;;
-;; Copyright (C) 2018 Matt Welland
+;; Copyright (C) 2018-2021 Matt Welland
;; Redistribution and use in source and binary forms, with or without
;; modification, is permitted.
;;
;; THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
;; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
@@ -23,330 +23,521 @@
;; NOTES:
;; Why sql-de-lite and not say, dbi? - performance mostly, then simplicity.
;;
;;======================================================================
-(use mailbox)
-
-(module ulex
- *
-
-(import scheme posix chicken data-structures ports extras files mailbox)
-(import srfi-18 pkts matchable regex
- typed-records srfi-69 srfi-1
- srfi-4 regex-case
- (prefix sqlite3 sqlite3:)
- foreign
- tcp6
- ;; ulex-netutil
- hostinfo
- )
-
-;; make it a global? Well, it is local to area module
-
-(define *captain-pktspec*
- `((captain (host . h)
- (port . p)
- (pid . i)
- (ipaddr . a)
- )
- #;(data (hostname . h) ;; sender hostname
- (port . p) ;; sender port
- (ipaddr . a) ;; sender ip
- (hostkey . k) ;; sending host key - store info at server under this key
- (servkey . s) ;; server key - this needs to match at server end or reject the msg
- (format . f) ;; sb=serialized-base64, t=text, sx=sexpr, j=json
- (data . d) ;; base64 encoded slln data
- )))
-
-;; struct for keeping track of our world
-
-(defstruct udat
- ;; captain info
- (captain-address #f)
- (captain-host #f)
- (captain-port #f)
- (captain-pid #f)
- (captain-lease 0) ;; time (unix epoc) seconds when the lease is up
- (ulex-dir (conc (get-environment-variable "HOME") "/.ulex"))
- (cpkts-dir (conc (get-environment-variable "HOME") "/.ulex/pkts"))
- (cpkt-spec *captain-pktspec*)
- ;; this processes info
- (my-cpkt-key #f) ;; put Z card here when I create a pkt for myself as captain
- (my-address #f)
- (my-hostname #f)
- (my-port #f)
- (my-pid (current-process-id))
- (my-dbs '())
- ;; server and handler thread
- (serv-listener #f) ;; this processes server info
- (handler-thread #f)
- (mboxes (make-hash-table)) ;; key => mbox
- ;; other servers
- (peers (make-hash-table)) ;; host-port => peer record
- (dbowners (make-hash-table)) ;; dbfile => host-port
- (handlers (make-hash-table)) ;; dbfile => proc
- ;; (outgoing-conns (make-hash-table)) ;; host:port -> conn
- (work-queue (make-queue)) ;; most stuff goes here
- ;; (fast-queue (make-queue)) ;; super quick stuff goes here (e.g. ping)
- (busy #f) ;; is either of the queues busy, use to switch between queuing tasks or doing immediately
- ;; app info
- (appname #f)
- (dbtypes (make-hash-table)) ;; this should be an alist but hash is easier. dbtype => [ initproc syncproc ]
- ;; cookies
- (cnum 0) ;; cookie num
- )
-
-;;======================================================================
-;; NEW APPROACH
-;;======================================================================
-
-;; start-server-find-port ;; gotta have a server port ready from the very begining
-
-;; udata - all the connection info, captain, server, ulex db etc. MUST BE PASSED IN
-;; dbpath - full path and filename of the db to talk to or a symbol naming the db?
-;; callname - the remote call to execute
-;; params - parameters to pass to the remote call
-;;
-(define (remote-call udata dbpath dbtype callname . params)
- (start-server-find-port udata) ;; ensure we have a local server
- (find-or-setup-captain udata)
- ;; look at connect, process-request, send, send-receive
- (let-values (((cookie-key host-port)(get-db-owner udata dbpath dbtype)))
- (send-receive udata host-port callname cookie-key params)))
-
-;;======================================================================
-;; KEY FUNCTIONS - THESE ARE TOO BE EXPOSED AND USED
-;;======================================================================
-
-;; connection setup and management functions
-
-;; This is the basic setup command. Must always be
-;; called before connecting to a db using connect.
-;;
-;; find or become the captain
-;; setup and return a ulex object
-;;
-(define (find-or-setup-captain udata)
- ;; see if we already have a captain and if the lease is ok
- (if (and (udat-captain-address udata)
- (udat-captain-port udata)
- (< (current-seconds) (udat-captain-lease udata)))
- udata
- (let* ((cpkts (get-all-captain-pkts udata)) ;; read captain pkts
- (captn (get-winning-pkt cpkts)))
- (if captn
- (let* ((port (alist-ref 'port captn))
- (host (alist-ref 'host captn))
- (ipaddr (alist-ref 'ipaddr captn))
- (pid (alist-ref 'pid captn))
- (Z (alist-ref 'Z captn)))
- (udat-captain-address-set! udata ipaddr)
- (udat-captain-host-set! udata host)
- (udat-captain-port-set! udata port)
- (udat-captain-pid-set! udata pid)
- (udat-captain-lease-set! udata (+ (current-seconds) 10))
- (let-values (((success pingtime)(ping udata (conc ipaddr ":" port))))
- (if success
- udata
- (begin
- (print "Found unreachable captain at " ipaddr ":" port ", removing pkt")
- (remove-captain-pkt udata captn)
- (find-or-setup-captain udata))))
- (begin
- (setup-as-captain udata) ;; this saves the thread to captain-thread and starts the thread
- (find-or-setup-captain udata)))))))
-
-;; connect to a specific dbfile
-;; - if already connected - return the dbowner host-port
-;; - ask the captain who to talk to for this db
-;; - put the entry in the dbowners hash as dbfile => host-port
-;;
-(define (connect udata dbfname dbtype)
- (or (hash-table-ref/default (udat-dbowners udata) dbfname #f)
- (let-values (((success dbowner-host-port)(get-db-owner udata dbfname dbtype)))
- (if success
- (begin
- ;; just clobber the record, this is the new data no matter what
- (hash-table-set! (udat-dbowners udata) dbfname dbowner-host-port)
- dbowner-host-port)
- #f))))
-
-;; returns: success pingtime
-;;
-;; NOTE: causes the callee to store the info on this host along with the dbs this host currently owns
-;;
-(define (ping udata host-port)
- (let* ((start (current-milliseconds))
- (cookie (make-cookie udata))
- (dbs (udat-my-dbs udata))
- (msg (string-intersperse dbs " "))
- (res (send udata host-port 'ping cookie msg retval: #t))
- (delta (- (current-milliseconds) start)))
- (values (equal? res cookie) delta)))
-
-;; returns: success pingtime
-;;
-;; NOTE: causes all references to this worker to be wiped out in the
-;; callee (ususally the captain)
-;;
-(define (goodbye-ping udata host-port)
- (let* ((start (current-milliseconds))
- (cookie (make-cookie udata))
- (dbs (udat-my-dbs udata))
- (res (send udata host-port 'goodbye cookie "nomsg" retval: #t))
- (delta (- (current-milliseconds) start)))
- (values (equal? res cookie) delta)))
-
-(define (goodbye-captain udata)
- (let* ((host-port (udat-captain-host-port udata)))
- (if host-port
- (goodbye-ping udata host-port)
- (values #f -1))))
-
-(define (get-db-owner udata dbname dbtype)
- (let* ((host-port (udat-captain-host-port udata)))
- (if host-port
- (let* ((cookie (make-cookie udata))
- (msg #f) ;; (conc dbname " " dbtype))
- (params `(,dbname ,dbtype))
- (res (send udata host-port 'db-owner cookie msg
- params: params retval: #t)))
- (match (string-split res)
- ((retcookie owner-host-port)
- (values (equal? retcookie cookie) owner-host-port))))
- (values #f -1))))
-
-;; called in ulex-handler to dispatch work, called on the workers side
-;; calls (proc params data)
-;; returns result with cookie
-;;
-;; pdat is the info of the caller, used to send the result data
-;; prockey is key into udat-handlers hash dereferencing a proc
-;; procparam is a first param handed to proc - often to do further derefrencing
-;; NOTE: params is intended to be a list of strings, encoding on data
-;; is up to the user but data must be a single line
-;;
-(define (process-request udata pdat dbname cookie prockey procparam data)
- (let* ((dbrec (ulex-open-db udata dbname)) ;; this will be a dbconn record, looks for in udata first
- (proc (hash-table-ref udata prockey)))
- (let* ((result (proc dbrec procparam data)))
- result)))
-
-;; remote-request - send to remote to process in process-request
-;; uconn comes from a call to connect and can be used instead of calling connect again
-;; uconn is the host-port to call
-;; we send dbname to the worker so they know which file to open
-;; data must be a string with no newlines, it will be handed to the proc
-;; at the remote site unchanged. It is up to the user to encode/decode it's contents
-;;
-;; rtype: immediate, read-only, normal, low-priority
-;;
-(define (remote-request udata uconn rtype dbname prockey procparam data)
- (let* ((cookie (make-cookie udata)))
- (send-receive udata uconn rtype cookie data `(,prockey procparam))))
-
-(define (ulex-open-db udata dbname)
- #f)
-
-
-;;======================================================================
-;; Ulex db
-;;
-;; - track who is captain, lease expire time
-;; - track who owns what db, lease
-;;
-;;======================================================================
-
-;;
-;;
-(define (ulex-dbfname)
- (let ((dbdir (conc (get-environment-variable "HOME") "/.ulex")))
- (if (not (file-exists? dbdir))
- (create-directory dbdir #t))
- (conc dbdir "/network.db")))
-
-;; always goes in ~/.ulex/network.db
-;; role is captain, adjutant, node
-;;
-(define (ulexdb-setup)
- (let* ((dbfname (ulex-dbfname))
- (have-db (file-exists? dbfname))
- (db (sqlite3:open-database dbfname)))
- (sqlite3:set-busy-handler! db (sqlite3:make-busy-timeout 136000))
- (sqlite3:execute db "PRAGMA synchronous = 0;")
- (if (not have-db)
- (sqlite3:with-transaction
- db
- (lambda ()
- (for-each
- (lambda (stmt)
- (if stmt (sqlite3:execute db stmt)))
- `("CREATE TABLE IF NOT EXISTS nodes
- (id INTEGER PRIMARY KEY,
- role TEXT NOT NULL,
- host TEXT NOT NULL,
- port TEXT NOT NULL,
- ipadr TEXT NOT NULL,
- pid INTEGER NOT NULL,
- zcard TEXT NOT NULL,
- regtime INTEGER DEFAULT (strftime('%s','now')),
- lease_thru INTEGER DEFAULT (strftime('%s','now')),
- last_update INTEGER DEFAULT (strftime('%s','now')));"
- "CREATE TRIGGER IF NOT EXISTS update_nodes_trigger AFTER UPDATE ON nodes
- FOR EACH ROW
- BEGIN
- UPDATE nodes SET last_update=(strftime('%s','now'))
- WHERE id=old.id;
- END;"
- "CREATE TABLE IF NOT EXISTS dbs
- (id INTEGER PRIMARY KEY,
- dbname TEXT NOT NULL,
- dbfile TEXT NOT NULL,
- dbtype TEXT NOT NULL,
- host_port TEXT NOT NULL,
- regtime INTEGER DEFAULT (strftime('%s','now')),
- lease_thru INTEGER DEFAULT (strftime('%s','now')),
- last_update INTEGER DEFAULT (strftime('%s','now')));"
- "CREATE TRIGGER IF NOT EXISTS update_dbs_trigger AFTER UPDATE ON dbs
- FOR EACH ROW
- BEGIN
- UPDATE dbs SET last_update=(strftime('%s','now'))
- WHERE id=old.id;
- END;")))))
- db))
-
-(define (get-host-port-lease db dbfname)
- (sqlite3:fold-row
- (lambda (rem host-port lease-thru)
- (list host-port lease-thru))
- #f db "SELECT host_port,lease_thru FROM dbs WHERE dbfile = ?" dbfname))
-
-(define (register-captain db host ipadr port pid zcard #!key (lease 20))
- (let* ((dbfname (ulex-dbfname))
- (host-port (conc host ":" port)))
- (sqlite3:with-transaction
- db
- (lambda ()
- (match (get-host-port-lease db dbfname)
- ((host-port lease-thru)
- (if (> (current-seconds) lease-thru)
- (begin
- (sqlite3:execute db "UPDATE dbs SET host_port=?,lease_thru=? WHERE dbname=?"
- (conc host ":" port)
- (+ (current-seconds) lease)
- dbfname)
- #t)
- #f))
- (#f (sqlite3:execute db "INSERT INTO dbs (dbname,dbfile,dbtype,host_port,lease_thru) VALUES (?,?,?,?,?)"
- "captain" dbfname "captain" host-port (+ (current-seconds) lease)))
- (else (print "ERROR: Unrecognised result from fold-row")
- (exit 1)))))))
-
+(module ulex
+ *
+ #;(
+
+ ;; NOTE: looking for the handler proc - find the run-listener :)
+
+ run-listener ;; (run-listener handler-proc [port]) => uconn
+
+ ;; NOTE: handler-proc params;
+ ;; (handler-proc rem-host-port qrykey cmd params)
+
+ send-receive ;; (send-receive uconn host-port cmd data)
+
+ ;; NOTE: cmd can be any plain text symbol except for these;
+ ;; 'ping 'ack 'goodbye 'response
+
+ set-work-handler ;; (set-work-handler proc)
+
+ wait-and-close ;; (wait-and-close uconn)
+
+ ulex-listener?
+
+ ;; needed to get the interface:port that was automatically found
+ udat-port
+ udat-host-port
+
+ ;; for testing only
+ ;; pp-uconn
+
+ ;; parameters
+ work-method ;; parameter; 'threads, 'mailbox, 'limited, 'direct
+ return-method ;; parameter; 'mailbox, 'polling, 'direct
+ )
+
+(import scheme
+ chicken.base
+ chicken.file
+ chicken.io
+ chicken.time
+ chicken.condition
+ chicken.string
+ chicken.sort
+ chicken.pretty-print
+
+ address-info
+ mailbox
+ matchable
+ ;; queues
+ regex
+ regex-case
+ simple-exceptions
+ s11n
+ srfi-1
+ srfi-18
+ srfi-4
+ srfi-69
+ system-information
+ tcp6
+ typed-records
+ )
+
+;; udat struct, used by both caller and callee
+;; instantiated as uconn by convention
+;;
+(defstruct udat
+ ;; the listener side
+ (port #f)
+ (host-port #f)
+ (socket #f)
+ ;; the peers
+ (peers (make-hash-table)) ;; host:port->peer
+ ;; work handling
+ (work-queue (make-mailbox))
+ (work-proc #f) ;; set by user
+ (cnum 0) ;; cookie number
+ (mboxes (make-hash-table)) ;; for the replies
+ (avail-cmboxes '()) ;; list of ( . ) for re-use
+ ;; threads
+ (numthreads 10)
+ (cmd-thread #f)
+ (work-queue-thread #f)
+ (num-threads-running 0)
+ )
+
+;; Parameters
+
+;; work-method:
+(define work-method (make-parameter 'mailbox))
+;; mailbox - all rdat goes through mailbox
+;; threads - all rdat immediately executed in new thread
+;; direct - no queuing
+;;
+
+;; return-method, return the result to waiting send-receive:
+(define return-method (make-parameter 'mailbox))
+;; mailbox - create a mailbox and use it for passing returning results to send-receive
+;; polling - put the result in a hash table keyed by qrykey and send-receive can poll it for result
+;; direct - no queuing, result is passed back in single tcp connection
+;;
+
+;; ;; struct for keeping track of others we are talking to
+;; ;;
+;; (defstruct pdat
+;; (host-port #f)
+;; (conns '()) ;; list of pcon structs, pop one off when calling the peer
+;; )
+;;
+;; ;; struct for peer connections, keep track of expiration etc.
+;; ;;
+;; (defstruct pcon
+;; (inp #f)
+;; (oup #f)
+;; (exp (+ (current-seconds) 59)) ;; expires at this time, set to (+ (current-seconds) 59)
+;; (lifetime (+ (current-seconds) 600)) ;; throw away and create new after five minutes
+;; )
+
+;;======================================================================
+;; listener
+;;======================================================================
+
+;; is uconn a ulex connector (listener)
+;;
+(define (ulex-listener? uconn)
+ (udat? uconn))
+
+;; create a tcp listener and return a populated udat struct with
+;; my port, address, hostname, pid etc.
+;; return #f if fail to find a port to allocate.
+;;
+;; if udata-in is #f create the record
+;; if there is already a serv-listener return the udata
+;;
+(define (setup-listener uconn #!optional (port 4242))
+ (handle-exceptions
+ exn
+ (if (< port 65535)
+ (setup-listener uconn (+ port 1))
+ #f)
+ (connect-listener uconn port)))
+
+(define (connect-listener uconn port)
+ ;; (tcp-listener-socket LISTENER)(socket-name so)
+ ;; sockaddr-address, sockaddr-port, sockaddr->string
+ (let* ((tlsn (tcp-listen port 1000 #f)) ;; (tcp-listen TCPPORT [BACKLOG [HOST]])
+ (addr (get-my-best-address))) ;; (hostinfo-addresses (host-information (current-hostname)))
+ (udat-port-set! uconn port)
+ (udat-host-port-set! uconn (conc addr":"port))
+ (udat-socket-set! uconn tlsn)
+ uconn))
+
+;; run-listener does all the work of starting a listener in a thread
+;; it then returns control
+;;
+(define (run-listener handler-proc #!optional (port-suggestion 4242))
+ (let* ((uconn (make-udat)))
+ (udat-work-proc-set! uconn handler-proc)
+ (if (setup-listener uconn port-suggestion)
+ (let* ((th1 (make-thread (lambda ()(ulex-cmd-loop uconn)) "Ulex command loop"))
+ (th2 (make-thread (lambda ()
+ (case (work-method)
+ ((mailbox limited)
+ (process-work-queue uconn))))
+ "Ulex work queue processor")))
+ ;; (tcp-buffer-size 2048)
+ (thread-start! th1)
+ (thread-start! th2)
+ (udat-cmd-thread-set! uconn th1)
+ (udat-work-queue-thread-set! uconn th2)
+ (print "cmd loop and process workers started, listening on "(udat-host-port uconn)".")
+ uconn)
+ (assert #f "ERROR: run-listener called without proper setup."))))
+
+(define (wait-and-close uconn)
+ (thread-join! (udat-cmd-thread uconn))
+ (tcp-close (udat-socket uconn)))
+
+;;======================================================================
+;; peers and connections
+;;======================================================================
+
+(define *send-mutex* (make-mutex))
+
+;; send structured data to recipient
+;;
+;; NOTE: qrykey is what was called the "cookie" previously
+;;
+;; retval tells send to expect and wait for return data (one line) and return it or time out
+;; this is for ping where we don't want to necessarily have set up our own server yet.
+;;
+;; NOTE: see below for beginnings of code to allow re-use of tcp connections
+;; - I believe (without substantial evidence) that re-using connections will
+;; be beneficial ...
+;;
+(define (send udata host-port qrykey cmd params)
+ (let* ((my-host-port (udat-host-port udata)) ;; remote will return to this
+ (isme #f #;(equal? host-port my-host-port)) ;; calling myself?
+ ;; dat is a self-contained work block that can be sent or handled locally
+ (dat (list my-host-port qrykey cmd params #;(cons (current-seconds)(current-milliseconds)))))
+ (cond
+ (isme (ulex-handler udata dat)) ;; no transmission needed
+ (else
+ (handle-exceptions ;; TODO - MAKE THIS EXCEPTION CMD SPECIFIC?
+ exn
+ (message exn)
+ (begin
+ ;; (mutex-lock! *send-mutex*) ;; DOESN'T SEEM TO HELP
+ (let-values (((inp oup)(tcp-connect host-port)))
+ (let ((res (if (and inp oup)
+ (begin
+ (serialize dat oup)
+ (close-output-port oup)
+ (deserialize inp)
+ )
+ (begin
+ (print "ERROR: send called but no receiver has been setup. Please call setup first!")
+ #f))))
+ (close-input-port inp)
+ ;; (mutex-unlock! *send-mutex*) ;; DOESN'T SEEM TO HELP
+ res)))))))) ;; res will always be 'ack unless return-method is direct
+
+(define (send-via-polling uconn host-port cmd data)
+ (let* ((qrykey (make-cookie uconn))
+ (sres (send uconn host-port qrykey cmd data)))
+ (case sres
+ ((ack)
+ (let loop ((start-time (current-milliseconds)))
+ (if (> (current-milliseconds)(+ start-time 10000)) ;; ten seconds timeout
+ (begin
+ (print "ULEX ERROR: timed out waiting for response from "host-port", "cmd" "data)
+ #f)
+ (let* ((result (hash-table-ref/default (udat-mboxes uconn) qrykey #f))) ;; NOTE: we are re-using mboxes hash
+ (if result ;; result is '(status . result-data) or #f for nothing yet
+ (begin
+ (hash-table-delete! (udat-mboxes uconn) qrykey)
+ (cdr result))
+ (begin
+ (thread-sleep! 0.01)
+ (loop start-time)))))))
+ (else
+ (print "ULEX ERROR: Communication failed? sres="sres)
+ #f))))
+
+(define (send-via-mailbox uconn host-port cmd data)
+ (let* ((cmbox (get-cmbox uconn)) ;; would it be better to keep a stack of mboxes to reuse?
+ (qrykey (car cmbox))
+ (mbox (cdr cmbox))
+ (mbox-time (current-milliseconds))
+ (sres (send uconn host-port qrykey cmd data))) ;; short res
+ (if (eq? sres 'ack) ;; BUG: change to be less than server:expiration-timeout?
+ (let* ((mbox-timeout-secs 120 #;(if (eq? 'primordial (thread-name (current-thread)))
+ #f
+ 120)) ;; timeout)
+ (mbox-timeout-result 'MBOX_TIMEOUT)
+ (res (mailbox-receive! mbox mbox-timeout-secs mbox-timeout-result))
+ (mbox-receive-time (current-milliseconds)))
+ ;; (put-cmbox uconn cmbox) ;; reuse mbox and cookie. is it worth it?
+ (hash-table-delete! (udat-mboxes uconn) qrykey)
+ (if (eq? res 'MBOX_TIMEOUT)
+ (begin
+ (print "WARNING: mbox timed out for query "cmd", with data "data
+ ", waiting for response from "host-port".")
+
+ ;; here it might make sense to clean up connection records and force clean start?
+ ;; NO. The progam using ulex needs to do the reset. Right thing here is exception
+
+ #f) ;; convert to raising exception?
+ res))
+ (begin
+ (print "ERROR: Communication failed? Got "sres)
+ #f))))
+
+;; send a request to the given host-port and register a mailbox in udata
+;; wait for the mailbox data and return it
+;;
+(define (send-receive uconn host-port cmd data)
+ (let* ((start-time (current-milliseconds))
+ (result (cond
+ ((member cmd '(ping goodbye)) ;; these are immediate
+ (send uconn host-port 'ping cmd data))
+ ((eq? (work-method) 'direct)
+ ;; the result from send will be the actual result, not an 'ack
+ (send uconn host-port 'direct cmd data))
+ (else
+ (case (return-method)
+ ((polling)
+ (send-via-polling uconn host-port cmd data))
+ ((mailbox)
+ (send-via-mailbox uconn host-port cmd data))
+ (else
+ (print "ULEX ERROR: unrecognised return-method "(return-method)".")
+ #f)))))
+ (duration (- (current-milliseconds) start-time)))
+ ;; this is ONLY for development and debugging. It will be removed once Ulex is stable.
+ (if (< 5000 duration)
+ (print "ULEX WARNING: round-trip took "(inexact->exact (round (/ duration 1000)))
+ " seconds; "cmd", host-port="host-port", data="data))
+ result))
+
+
+;;======================================================================
+;; responder side
+;;======================================================================
+
+;; take a request, rdat, and if not immediate put it in the work queue
+;;
+;; Reserved cmds; ack ping goodbye response
+;;
+(define (ulex-handler uconn rdat)
+ (assert (list? rdat) "FATAL: ulex-handler give rdat as not list")
+ (match rdat ;; (string-split controldat)
+ ((rem-host-port qrykey cmd params);; timedata)
+ ;; (print "ulex-handler got: "rem-host-port" qrykey: "qrykey" cmd: "cmd" params: "params)
+ (case cmd
+ ;; ((ack )(print "Got ack! But why? Should NOT get here.") 'ack)
+ ((ping)
+ ;; (print "Got Ping!")
+ ;; (add-to-work-queue uconn rdat)
+ 'ack)
+ ((goodbye)
+ ;; just clear out references to the caller. NOT COMPLETE
+ (add-to-work-queue uconn rdat)
+ 'ack)
+ ((response) ;; this is a result from remote processing, send it as mail ...
+ (case (return-method)
+ ((polling)
+ (hash-table-set! (udat-mboxes uconn) qrykey (cons 'ok params))
+ 'ack)
+ ((mailbox)
+ (let ((mbox (hash-table-ref/default (udat-mboxes uconn) qrykey #f)))
+ (if mbox
+ (begin
+ (mailbox-send! mbox params) ;; params here is our result
+ 'ack)
+ (begin
+ (print "ERROR: received result but no associated mbox for cookie "qrykey)
+ 'no-mbox-found))))
+ (else (print "ULEX ERROR: unrecognised return-method "(return-method))
+ 'bad-return-method)))
+ (else ;; generic request - hand it to the work queue
+ (add-to-work-queue uconn rdat)
+ 'ack)))
+ (else
+ (print "ULEX ERROR: bad rdat "rdat)
+ 'bad-rdat)))
+
+;; given an already set up uconn start the cmd-loop
+;;
+(define (ulex-cmd-loop uconn)
+ (let* ((serv-listener (udat-socket uconn))
+ (listener (lambda ()
+ (let loop ((state 'start))
+ (let-values (((inp oup)(tcp-accept serv-listener)))
+ ;; (mutex-lock! *send-mutex*) ;; DOESN'T SEEM TO HELP
+ (let* ((rdat (deserialize inp)) ;; '(my-host-port qrykey cmd params)
+ (resp (ulex-handler uconn rdat)))
+ (serialize resp oup)
+ (close-input-port inp)
+ (close-output-port oup)
+ ;; (mutex-unlock! *send-mutex*) ;; DOESN'T SEEM TO HELP
+ )
+ (loop state))))))
+ ;; start N of them
+ (let loop ((thnum 0)
+ (threads '()))
+ (if (< thnum 100)
+ (let* ((th (make-thread listener (conc "listener" thnum))))
+ (thread-start! th)
+ (loop (+ thnum 1)
+ (cons th threads)))
+ (map thread-join! threads)))))
+
+;; add a proc to the cmd list, these are done symetrically (i.e. in all instances)
+;; so that the proc can be dereferenced remotely
+;;
+(define (set-work-handler uconn proc)
+ (udat-work-proc-set! uconn proc))
+
+;;======================================================================
+;; work queues - this is all happening on the listener side
+;;======================================================================
+
+;; rdat is (rem-host-port qrykey cmd params)
+
+(define (add-to-work-queue uconn rdat)
+ #;(queue-add! (udat-work-queue uconn) rdat)
+ (case (work-method)
+ ((threads)
+ (thread-start! (make-thread (lambda ()
+ (do-work uconn rdat))
+ "worker thread")))
+ ((mailbox)
+ (mailbox-send! (udat-work-queue uconn) rdat))
+ ((direct)
+ (do-work uconn rdat))
+ (else
+ (print "ULEX ERROR: work-method "(work-method)" not recognised, using mailbox.")
+ (mailbox-send! (udat-work-queue uconn) rdat))))
+
+;; move the logic to return the result somewhere else?
+;;
+(define (do-work uconn rdat)
+ (let* ((proc (udat-work-proc uconn))) ;; get it each time - conceivebly it could change
+ ;; put this following into a do-work procedure
+ (match rdat
+ ((rem-host-port qrykey cmd params)
+ (let* ((start-time (current-milliseconds))
+ (result (proc rem-host-port qrykey cmd params))
+ (end-time (current-milliseconds))
+ (run-time (- end-time start-time)))
+ (case (work-method)
+ ((direct) result)
+ (else
+ (if (> run-time 1000)(print "ULEX: Warning, work "cmd", "params" done in "run-time" ms"))
+ ;; send 'response as cmd and result as params
+ (send uconn rem-host-port qrykey 'response result) ;; could check for ack
+ (let* ((duration (- (current-milliseconds) end-time)))
+ (if (> duration 500)(print "ULEX: Warning, response sent back to "rem-host-port" for "qrykey" in "duration"ms")))))))
+ (MBOX_TIMEOUT 'do-work-timeout)
+ (else
+ (print "ERROR: rdat "rdat", did not match rem-host-port qrykey cmd params")))))
+
+;; NEW APPROACH:
+;;
+(define (process-work-queue uconn)
+ (let ((wqueue (udat-work-queue uconn))
+ (proc (udat-work-proc uconn))
+ (numthr (udat-numthreads uconn)))
+ (let loop ((thnum 1)
+ (threads '()))
+ (let ((thlst (cons (make-thread (lambda ()
+ (let work-loop ()
+ (let ((rdat (mailbox-receive! wqueue 24000 'MBOX_TIMEOUT)))
+ (do-work uconn rdat))
+ (work-loop)))
+ (conc "work thread " thnum))
+ threads)))
+ (if (< thnum numthr)
+ (loop (+ thnum 1)
+ thlst)
+ (begin
+ (print "ULEX: Starting "(length thlst)" worker threads.")
+ (map thread-start! thlst)
+ (print "ULEX: Threads started. Joining all.")
+ (map thread-join! thlst)))))))
+
+;; below was to enable re-use of connections. This seems non-trivial so for
+;; now lets open on each call
+;;
+;; ;; given host-port get or create peer struct
+;; ;;
+;; (define (udat-get-peer uconn host-port)
+;; (or (hash-table-ref/default (udat-peers uconn) host-port #f)
+;; ;; no peer, so create pdat and init it
+;;
+;; ;; NEED stack of connections, pop and use; inp, oup,
+;; ;; creation_time (remove and create new if over 24hrs old
+;; ;;
+;; (let ((pdat (make-pdat host-port: host-port)))
+;; (hash-table-set! (udat-peers uconn) host-port pdat)
+;; pdat)))
+;;
+;; ;; is pcon alive
+;;
+;; ;; given host-port and pdat get a pcon
+;; ;;
+;; (define (pdat-get-pcon pdat host-port)
+;; (let loop ((conns (pdat-conns pdat)))
+;; (if (null? conns) ;; none? make and return - do NOT add - it will be pushed back on list later
+;; (init-pcon (make-pcon))
+;; (let* ((conn (pop conns)))
+;;
+;; ;; given host-port get a pcon struct
+;; ;;
+;; (define (udat-get-pcon
+
+;;======================================================================
+;; misc utils
+;;======================================================================
+
+(define (make-cookie uconn)
+ (let ((newcnum (+ (udat-cnum uconn) 1)))
+ (udat-cnum-set! uconn newcnum)
+ (conc (udat-host-port uconn) ":"
+ newcnum)))
+
+;; cookie/mboxes
+
+;; we store each mbox with a cookie ( . )
+;;
+(define (get-cmbox uconn)
+ (if (null? (udat-avail-cmboxes uconn))
+ (let ((cookie (make-cookie uconn))
+ (mbox (make-mailbox)))
+ (hash-table-set! (udat-mboxes uconn) cookie mbox)
+ `(,cookie . ,mbox))
+ (let ((cmbox (car (udat-avail-cmboxes uconn))))
+ (udat-avail-cmboxes-set! uconn (cdr (udat-avail-cmboxes uconn)))
+ cmbox)))
+
+(define (put-cmbox uconn cmbox)
+ (udat-avail-cmboxes-set! uconn (cons cmbox (udat-avail-cmboxes uconn))))
+
+(define (pp-uconn uconn)
+ (pp (udat->alist uconn)))
+
+
;;======================================================================
;; network utilities
;;======================================================================
+
+;; NOTE: Look at address-info egg as alternative to some of this
(define (rate-ip ipaddr)
(regex-case ipaddr
( "^127\\..*" _ 0 )
( "^(10\\.0|192\\.168)\\..*" _ 1 )
@@ -354,1899 +545,26 @@
;; Change this to bias for addresses with a reasonable broadcast value?
;;
(define (ip-pref-less? a b)
(> (rate-ip a) (rate-ip b)))
-
(define (get-my-best-address)
- (let ((all-my-addresses (get-all-ips))
- ;;(all-my-addresses-old (vector->list (hostinfo-addresses (hostname->hostinfo (get-host-name)))))
- )
+ (let ((all-my-addresses (get-all-ips)))
(cond
((null? all-my-addresses)
(get-host-name)) ;; no interfaces?
((eq? (length all-my-addresses) 1)
(car all-my-addresses)) ;; only one to choose from, just go with it
-
(else
- (car (sort all-my-addresses ip-pref-less?)))
- ;; (else
- ;; (ip->string (car (filter (lambda (x) ;; take any but 127.
- ;; (not (eq? (u8vector-ref x 0) 127)))
- ;; all-my-addresses))))
-
- )))
+ (car (sort all-my-addresses ip-pref-less?))))))
(define (get-all-ips-sorted)
(sort (get-all-ips) ip-pref-less?))
(define (get-all-ips)
- (map ip->string (vector->list
- (hostinfo-addresses
- (host-information (current-hostname))))))
-
-(define (udat-my-host-port udata)
- (if (and (udat-my-address udata)(udat-my-port udata))
- (conc (udat-my-address udata) ":" (udat-my-port udata))
- #f))
-
-(define (udat-captain-host-port udata)
- (if (and (udat-captain-address udata)(udat-captain-port udata))
- (conc (udat-captain-address udata) ":" (udat-captain-port udata))
- #f))
-
-(define (udat-get-peer udata host-port)
- (hash-table-ref/default (udat-peers udata) host-port #f))
-
-;; struct for keeping track of others we are talking to
-
-(defstruct peer
- (addr-port #f)
- (hostname #f)
- (pid #f)
- ;; (inp #f)
- ;; (oup #f)
- (dbs '()) ;; list of databases this peer is currently handling
- )
-
-(defstruct work
- (peer-dat #f)
- (handlerkey #f)
- (qrykey #f)
- (data #f)
- (start (current-milliseconds)))
-
-#;(defstruct dbowner
- (pdat #f)
- (last-update (current-seconds)))
-
-;;======================================================================
-;; Captain functions
-;;======================================================================
-
-;; NB// This needs to be started in a thread
-;;
-;; setup to be a captain
-;; - local server MUST be started already
-;; - create pkt
-;; - start server port handler
-;;
-(define (setup-as-captain udata)
- (if (create-captain-pkt udata)
- (let* ((my-addr (udat-my-address udata))
- (my-port (udat-my-port udata))
- (th (make-thread (lambda ()
- (ulex-handler-loop udata)) "Captain handler")))
- (udat-handler-thread-set! udata th)
- (udat-captain-address-set! udata my-addr)
- (udat-captain-port-set! udata my-port)
- (thread-start! th))
- (begin
- (print "ERROR: failed to create captain pkt")
- #f)))
-
-;; given a pkts dir read
-;;
-(define (get-all-captain-pkts udata)
- (let* ((pktsdir (let ((d (udat-cpkts-dir udata)))
- (if (file-exists? d)
- d
- (begin
- (create-directory d #t)
- d))))
- (all-pkt-files (glob (conc pktsdir "/*.pkt")))
- (pkt-spec (udat-cpkt-spec udata)))
- (map (lambda (pkt-file)
- (read-pkt->alist pkt-file pktspec: pkt-spec))
- all-pkt-files)))
-
-;; sort by D then Z, return one, choose the oldest then
-;; differentiate if needed using the Z key
-;;l
-(define (get-winning-pkt pkts)
- (if (null? pkts)
- #f
- (car (sort pkts (lambda (a b)
- (let ((ad (string->number (alist-ref 'D a)))
- (bd (string->number (alist-ref 'D b))))
- (if (eq? a b)
- (let ((az (alist-ref 'Z a))
- (bz (alist-ref 'Z b)))
- (string>=? az bz))
- (> ad bd))))))))
-
-;; put the host, ip, port and pid into a pkt in
-;; the captain pkts dir
-;; - assumes user has already fired up a server
-;; which will be in the udata struct
-;;
-(define (create-captain-pkt udata)
- (if (not (udat-serv-listener udata))
- (begin
- (print "ERROR: create-captain-pkt called with out a listener")
- #f)
- (let* ((pktdat `((port . ,(udat-my-port udata))
- (host . ,(udat-my-hostname udata))
- (ipaddr . ,(udat-my-address udata))
- (pid . ,(udat-my-pid udata))))
- (pktdir (udat-cpkts-dir udata))
- (pktspec (udat-cpkt-spec udata))
- )
- (udat-my-cpkt-key-set!
- udata
- (write-alist->pkt
- pktdir
- pktdat
- pktspec: pktspec
- ptype: 'captain))
- (udat-my-cpkt-key udata))))
-
-;; remove pkt associated with captn (the Z key .pkt)
-;;
-(define (remove-captain-pkt udata captn)
- (let ((Z (alist-ref 'Z captn))
- (cpktdir (udat-cpkts-dir udata)))
- (delete-file* (conc cpktdir "/" Z ".pkt"))))
-
-;; call all known peers and tell them to delete their info on the captain
-;; thus forcing them to re-read pkts and connect to a new captain
-;; call this when the captain needs to exit and if an older captain is
-;; detected. Due to delays in sending file meta data in NFS multiple
-;; captains can be initiated in a "Storm of Captains", book soon to be
-;; on Amazon
-;;
-(define (drop-captain udata)
- (let* ((peers (hash-table-keys (udat-peers udata)))
- (cookie (make-cookie udata)))
- (for-each
- (lambda (host-port)
- (send udata host-port 'dropcaptain cookie "nomsg" retval: #t))
- peers)))
-
-;;======================================================================
-;; server primitives
-;;======================================================================
-
-(define (make-cookie udata)
- (let ((newcnum (+ (udat-cnum udata) 1)))
- (udat-cnum-set! udata newcnum)
- (conc (udat-my-address udata) ":"
- (udat-my-port udata) "-"
- (udat-my-pid udata) "-"
- newcnum)))
-
-;; create a tcp listener and return a populated udat struct with
-;; my port, address, hostname, pid etc.
-;; return #f if fail to find a port to allocate.
-;;
-;; if udata-in is #f create the record
-;; if there is already a serv-listener return the udata
-;;
-(define (start-server-find-port udata-in #!optional (port 4242))
- (let ((udata (or udata-in (make-udat))))
- (if (udat-serv-listener udata) ;; TODO - add check that the listener is alive and ready?
- udata
- (handle-exceptions
- exn
- (if (< port 65535)
- (start-server-find-port udata (+ port 1))
- #f)
- (connect-server udata port)))))
-
-(define (connect-server udata port)
- ;; (tcp-listener-socket LISTENER)(socket-name so)
- ;; sockaddr-address, sockaddr-port, sockaddr->string
- (let* ((tlsn (tcp-listen port 1000 #f)) ;; (tcp-listen TCPPORT [BACKLOG [HOST]])
- (addr (get-my-best-address))) ;; (hostinfo-addresses (host-information (current-hostname)))
- (udat-my-address-set! udata addr)
- (udat-my-port-set! udata port)
- (udat-my-hostname-set! udata (get-host-name))
- (udat-serv-listener-set! udata tlsn)
- udata))
-
-(define (get-peer-dat udata host-port #!optional (hostname #f)(pid #f))
- (let* ((pdat (or (udat-get-peer udata host-port)
- (handle-exceptions ;; ERROR - MAKE THIS EXCEPTION HANDLER MORE SPECIFIC
- exn
- #f
- (let ((npdat (make-peer addr-port: host-port)))
- (if hostname (peer-hostname-set! npdat hostname))
- (if pid (peer-pid-set! npdat pid))
- npdat)))))
- pdat))
-
-;; send structured data to recipient
-;;
-;; NOTE: qrykey is what was called the "cookie" previously
-;;
-;; retval tells send to expect and wait for return data (one line) and return it or time out
-;; this is for ping where we don't want to necessarily have set up our own server yet.
-;;
-(define (send udata host-port handler qrykey data
- #!key (hostname #f)(pid #f)(params '())(retval #f))
- (let* ((my-host-port (udat-my-host-port udata))
- (isme (equal? host-port my-host-port)) ;; am I calling
- ;; myself?
- (dat (list
- handler ;; " "
- my-host-port ;; " "
- (udat-my-pid udata) ;; " "
- qrykey
- params ;;(if (null? params) "" (conc " "
- ;;(string-intersperse params " ")))
- )))
- ;; (print "send isme is " (if isme "true!" "false!") ",
- ;; my-host-port: " my-host-port ", host-port: " host-port)
- (if isme
- (ulex-handler udata dat data)
- (handle-exceptions ;; ERROR - MAKE THIS EXCEPTION HANDLER MORE
- ;; SPECIFIC
- exn
- #f
- (let-values (((inp oup)(tcp-connect host-port)))
- ;;
- ;; CONTROL LINE:
- ;; handlerkey host:port pid qrykey params ...
- ;;
- (let ((res
- (if (and inp oup)
- (let* ()
- (if my-host-port
- (begin
- (write dat oup)
- (write data oup) ;; send as sexpr
- ;; (print "Sent dat: " dat " data: " data)
- (if retval
- (read inp)
- #t))
- (begin
- (print "ERROR: send called but no receiver has been setup. Please call setup first!")
- #f))
- ;; NOTE: DO NOT BE TEMPTED TO LOOK AT ANY DATA ON INP HERE!
- ;; (there is a listener for handling that)
- )
- #f))) ;; #f means failed to connect and send
- (close-input-port inp)
- (close-output-port oup)
- res))))))
-
-;; send a request to the given host-port and register a mailbox in udata
-;; wait for the mailbox data and return it
-;;
-(define (send-receive udata host-port handler qrykey data #!key (hostname #f)(pid #f)(params '())(timeout 20))
- (let ((mbox (make-mailbox))
- (mbox-time (current-milliseconds))
- (mboxes (udat-mboxes udata)))
- (hash-table-set! mboxes qrykey mbox)
- (if (send udata host-port handler qrykey data hostname: hostname pid: pid params: params)
- (let* ((mbox-timeout-secs timeout)
- (mbox-timeout-result 'MBOX_TIMEOUT)
- (res (mailbox-receive! mbox mbox-timeout-secs mbox-timeout-result))
- (mbox-receive-time (current-milliseconds)))
- (hash-table-delete! mboxes qrykey)
- (if (eq? res 'MBOX_TIMEOUT)
- #f
- res))
- #f))) ;; #f means failed to communicate
-
-;;
-(define (ulex-handler udata controldat data)
- (print "controldat: " controldat " data: " data)
- (match controldat ;; (string-split controldat)
- ((handlerkey host-port pid qrykey params ...)
- ;; (print "handlerkey: " handlerkey " host-port: " host-port " pid: " pid " qrykey: " qrykey " params: " params)
- (case handlerkey ;; (string->symbol handlerkey)
- ((ack)(print "Got ack!"))
- ((ping) ;; special case - return result immediately on the same connection
- (let* ((proc (hash-table-ref/default (udat-handlers udata) 'ping #f))
- (val (if proc (proc) "gotping"))
- (peer (make-peer addr-port: host-port pid: pid))
- (dbshash (udat-dbowners udata)))
- (peer-dbs-set! peer params) ;; params for ping is list of dbs owned by pinger
- (for-each (lambda (dbfile)
- (hash-table-set! dbshash dbfile host-port)) ;; WRONG?
- params) ;; register each db in the dbshash
- (if (not (hash-table-exists? (udat-peers udata) host-port))
- (hash-table-set! (udat-peers udata) host-port peer)) ;; save the details of this caller in peers
- qrykey)) ;; End of ping
- ((goodbye)
- ;; remove all traces of the caller in db ownership etc.
- (let* ((peer (hash-table-ref/default (udat-peers udata) host-port #f))
- (dbs (if peer (peer-dbs peer) '()))
- (dbshash (udat-dbowners udata)))
- (for-each (lambda (dbfile)(hash-table-delete! dbshash dbfile)) dbs)
- (hash-table-delete! (udat-peers udata) host-port)
- qrykey))
- ((dropcaptain)
- ;; remove all traces of the captain
- (udat-captain-address-set! udata #f)
- (udat-captain-host-set! udata #f)
- (udat-captain-port-set! udata #f)
- (udat-captain-pid-set! udata #f)
- qrykey)
- ((rucaptain) ;; remote is asking if I'm the captain
- (if (udat-my-cpkt-key udata) "yes" "no"))
- ((db-owner) ;; given a db name who do I send my queries to
- ;; look up the file in handlers, if have an entry ping them to be sure
- ;; they are still alive and then return that host:port.
- ;; if no handler found or if the ping fails pick from peers the oldest that
- ;; is managing the fewest dbs
- (match params
- ((dbfile dbtype)
- (let* ((owner-host-port (hash-table-ref/default (udat-dbowners udata) dbfile #f)))
- (if owner-host-port
- (conc qrykey " " owner-host-port)
- (let* ((pdat (or (hash-table-ref/default (udat-peers udata) host-port #f) ;; no owner - caller gets to own it!
- (make-peer addr-port: host-port pid: pid dbs: `(,dbfile)))))
- (hash-table-set! (udat-peers udata) host-port pdat)
- (hash-table-set! (udat-dbowners udata) dbfile host-port)
- (conc qrykey " " host-port)))))
- (else (conc qrykey " BADDATA"))))
- ;; for work items:
- ;; handler is one of; immediate, read-only, read-write, high-priority
- ((immediate read-only normal low-priority) ;; do this work immediately
- ;; host-port (caller), pid (caller), qrykey (cookie), params <= all from first line
- ;; data => a single line encoded however you want, or should I build json into it?
- (print "handlerkey=" handlerkey)
- (let* ((pdat (get-peer-dat udata host-port)))
- (match params ;; dbfile prockey procparam
- ((dbfile prockey procparam)
- (case handlerkey
- ((immediate read-only)
- (process-request udata pdat dbfile qrykey prockey procparam data))
- ((normal low-priority) ;; split off later and add logic to support low priority
- (add-to-work-queue udata pdat dbfile qrykey prockey procparam data))
- (else
- #f)))
- (else
- (print "INFO: params=" params " handlerkey=" handlerkey " controldat=" controldat)
- #f))))
- (else
- ;; (add-to-work-queue udata (get-peer-dat udata host-port) handlerkey qrykey data)
- #f)))
- (else
- (print "BAD DATA? controldat=" controldat " data=" data)
- #f)));; handles the incoming messages and dispatches to queues
-
-;;
-(define (ulex-handler-loop udata)
- (let* ((serv-listener (udat-serv-listener udata)))
- ;; data comes as two lines
- ;; handlerkey resp-addr:resp-port hostname pid qrykey [dbpath/dbfile.db]
- ;; data
- (let loop ((state 'start))
- (let-values (((inp oup)(tcp-accept serv-listener)))
- (let* ((controldat (read inp))
- (data (read inp))
- (resp (ulex-handler udata controldat data)))
- (if resp (write resp oup))
- (close-input-port inp)
- (close-output-port oup))
- (loop state)))))
-
-;; add a proc to the handler list, these are done symetrically (i.e. in all instances)
-;; so that the proc can be dereferenced remotely
-;;
-(define (register-handler udata key proc)
- (hash-table-set! (udat-handlers udata) key proc))
-
-
-;;======================================================================
-;; work queues
-;;======================================================================
-
-(define (add-to-work-queue udata peer-dat handlerkey qrykey data)
- (let ((wdat (make-work peer-dat: peer-dat handlerkey: handlerkey qrykey: qrykey data: data)))
- (if (udat-busy udata)
- (queue-add! (udat-work-queue udata) wdat)
- (process-work udata wdat)) ;; passing in wdat tells process-work to first process the passed in wdat
- ))
-
-(define (do-work udata wdat)
- #f)
-
-(define (process-work udata #!optional wdat)
- (if wdat (do-work udata wdat)) ;; process wdat
- (let ((wqueue (udat-work-queue udata)))
- (if (not (queue-empty? wqueue))
- (let loop ((wd (queue-remove! wqueue)))
- (do-work udata wd)
- (if (not (queue-empty? wqueue))
- (loop (queue-remove! wqueue)))))))
-
-;;======================================================================
-;; Generic db handling
-;; setup a inmem db instance
-;; open connection to on-disk db
-;; sync on-disk db to inmem
-;; get lock in on-disk db for dbowner of this db
-;; put sync-proc, init-proc, on-disk handle, inmem handle in dbconn stuct
-;; return the stuct
-;;======================================================================
-
-(defstruct dbconn
- (fname #f)
- (inmem #f)
- (conn #f)
- (sync #f) ;; sync proc
- (init #f) ;; init proc
- (lastsync (current-seconds))
- )
-
-(defstruct dbinfo
- (initproc #f)
- (syncproc #f))
-
-;; open inmem and disk database
-;; init with initproc
-;; return db struct
-;;
-;; appname; megatest, ulex or something else.
-;;
-(define (setup-db-connection udata fname-in appname dbtype)
- (let* ((is-ulex (eq? appname 'ulex))
- (dbinf (if is-ulex ;; ulex is a built-in special case
- (make-dbinfo initproc: ulexdb-init syncproc: ulexdb-sync)
- (hash-table-ref/default (udat-dbtypes udata) dbtype #f)))
- (initproc (dbinfo-initproc dbinf))
- (syncproc (dbinfo-syncproc dbinf))
- (fname (if is-ulex
- (conc (udat-ulex-dir udata) "/ulex.db")
- fname-in))
- (inmem-db (open-and-initdb udata #f 'inmem (dbinfo-initproc dbinf)))
- (disk-db (open-and-initdb udata fname 'disk (dbinfo-initproc dbinf))))
- (make-dbconn inmem: inmem-db conn: disk-db sync: syncproc init: initproc)))
-
-;; dest='inmem or 'disk
-;;
-(define (open-and-initdb udata filename dest init-proc)
- (let* ((inmem (eq? dest 'inmem))
- (dbfile (if inmem
- ":INMEM:"
- filename))
- (dbexists (if inmem #t (file-exists? dbfile)))
- (db (sqlite3:open-database dbfile)))
- (sqlite3:set-busy-handler! db (sqlite3:make-busy-timeout 136000))
- (if (not dbexists)
- (init-proc db))
- db))
-
-
-;;======================================================================
-;; Previous Ulex db stuff
-;;======================================================================
-
-(define (ulexdb-init db inmem)
- (sqlite3:with-transaction
- db
- (lambda ()
- (for-each
- (lambda (stmt)
- (if stmt (sqlite3:execute db stmt)))
- `("CREATE TABLE IF NOT EXISTS processes
- (id INTEGER PRIMARY KEY,
- host TEXT NOT NULL,
- ipadr TEXT NOT NULL,
- port INTEGER NOT NULL,
- pid INTEGER NOT NULL,
- regtime INTEGER DEFAULT (strftime('%s','now')),
- last_update INTEGER DEFAULT (strftime('%s','now')));"
- (if inmem
- "CREATE TRIGGER IF NOT EXISTS update_proces_trigger AFTER UPDATE ON processes
- FOR EACH ROW
- BEGIN
- UPDATE processes SET last_update=(strftime('%s','now'))
- WHERE id=old.id;
- END;"
- #f))))))
-
-;; open databases, do initial sync
-(define (ulexdb-sync dbconndat udata)
- #f)
-
-
-) ;; END OF ULEX
-
-
-;;; ;;======================================================================
-;;; ;; D E B U G H E L P E R S
-;;; ;;======================================================================
-;;;
-;;; (define (dbg> . args)
-;;; (with-output-to-port (current-error-port)
-;;; (lambda ()
-;;; (apply print "dbg> " args))))
-;;;
-;;; (define (debug-pp . args)
-;;; (if (get-environment-variable "ULEX_DEBUG")
-;;; (with-output-to-port (current-error-port)
-;;; (lambda ()
-;;; (apply pp args)))))
-;;;
-;;; (define *default-debug-port* (current-error-port))
-;;;
-;;; (define (sdbg> fn stage-name stage-start stage-end start-time . message)
-;;; (if (get-environment-variable "ULEX_DEBUG")
-;;; (with-output-to-port *default-debug-port*
-;;; (lambda ()
-;;; (apply print "ulex:" fn " " stage-name " took " (- (if stage-end stage-end (current-milliseconds)) stage-start) " ms. "
-;;; (if start-time
-;;; (conc "total time " (- (current-milliseconds) start-time)
-;;; " ms.")
-;;; "")
-;;; message
-;;; )))))
-
-;;======================================================================
-;; M A C R O S
-;;======================================================================
-;; iup callbacks are not dumping the stack, this is a work-around
-;;
-
-;; Some of these routines use:
-;;
-;; http://www.cs.toronto.edu/~gfb/scheme/simple-macros.html
-;;
-;; Syntax for defining macros in a simple style similar to function definiton,
-;; when there is a single pattern for the argument list and there are no keywords.
-;;
-;; (define-simple-syntax (name arg ...) body ...)
-;;
-;;
-;; (define-syntax define-simple-syntax
-;; (syntax-rules ()
-;; ((_ (name arg ...) body ...)
-;; (define-syntax name (syntax-rules () ((name arg ...) (begin body ...)))))))
-;;
-;; (define-simple-syntax (catch-and-dump proc procname)
-;; (handle-exceptions
-;; exn
-;; (begin
-;; (print-call-chain (current-error-port))
-;; (with-output-to-port (current-error-port)
-;; (lambda ()
-;; (print ((condition-property-accessor 'exn 'message) exn))
-;; (print "Callback error in " procname)
-;; (print "Full condition info:\n" (condition->list exn)))))
-;; (proc)))
-;;
-;;
-;;======================================================================
-;; R E C O R D S
-;;======================================================================
-
-;;; ;; information about me as a server
-;;; ;;
-;;; (defstruct area
-;;; ;; about this area
-;;; (useportlogger #f)
-;;; (lowport 32768)
-;;; (server-type 'auto) ;; auto=create up to five servers/pkts, main=create pkts, passive=no pkt (unless there are no pkts at all)
-;;; (conn #f)
-;;; (port #f)
-;;; (myaddr (get-my-best-address))
-;;; pktid ;; get pkt from hosts table if needed
-;;; pktfile
-;;; pktsdir
-;;; dbdir
-;;; (dbhandles (make-hash-table)) ;; fname => list-of-dbh, NOTE: Should really never need more than one?
-;;; (mutex (make-mutex))
-;;; (rtable (make-hash-table)) ;; registration table of available actions
-;;; (dbs (make-hash-table)) ;; filename => random number, used for choosing what dbs I serve
-;;; ;; about other servers
-;;; (hosts (make-hash-table)) ;; key => hostdat
-;;; (hoststats (make-hash-table)) ;; key => alist of fname => ( qcount . qtime )
-;;; (reqs (make-hash-table)) ;; uri => queue
-;;; ;; work queues
-;;; (wqueues (make-hash-table)) ;; fname => qdat
-;;; (stats (make-hash-table)) ;; fname => totalqueries
-;;; (last-srvup (current-seconds)) ;; last time we updated the known servers
-;;; (cookie2mbox (make-hash-table)) ;; map cookie for outstanding request to mailbox of awaiting call
-;;; (ready #f)
-;;; (health (make-hash-table)) ;; ipaddr:port => num failed pings since last good ping
-;;; )
-;;;
-;;; ;; host stats
-;;; ;;
-;;; (defstruct hostdat
-;;; (pkt #f)
-;;; (dbload (make-hash-table)) ;; "dbfile.db" => queries/min
-;;; (hostload #f) ;; normalized load ( 5min load / numcpus )
-;;; )
-;;;
-;;; ;; dbdat
-;;; ;;
-;;; (defstruct dbdat
-;;; (dbh #f)
-;;; (fname #f)
-;;; (write-access #f)
-;;; (sths (make-hash-table)) ;; hash mapping query strings to handles
-;;; )
-;;;
-;;; ;; qdat
-;;; ;;
-;;; (defstruct qdat
-;;; (writeq (make-queue))
-;;; (readq (make-queue))
-;;; (rwq (make-queue))
-;;; (logq (make-queue)) ;; do we need a queue for logging? yes, if we use sqlite3 db for logging
-;;; (osshort (make-queue))
-;;; (oslong (make-queue))
-;;; (misc (make-queue)) ;; used for things like ping-full
-;;; )
-;;;
-;;; ;; calldat
-;;; ;;
-;;; (defstruct calldat
-;;; (ctype 'dbwrite)
-;;; (obj #f) ;; this would normally be an SQL statement e.g. SELECT, INSERT etc.
-;;; (rtime (current-milliseconds)))
-;;;
-;;; ;; make it a global? Well, it is local to area module
-;;;
-;;; (define *pktspec*
-;;; `((server (hostname . h)
-;;; (port . p)
-;;; (pid . i)
-;;; (ipaddr . a)
-;;; )
-;;; (data (hostname . h) ;; sender hostname
-;;; (port . p) ;; sender port
-;;; (ipaddr . a) ;; sender ip
-;;; (hostkey . k) ;; sending host key - store info at server under this key
-;;; (servkey . s) ;; server key - this needs to match at server end or reject the msg
-;;; (format . f) ;; sb=serialized-base64, t=text, sx=sexpr, j=json
-;;; (data . d) ;; base64 encoded slln data
-;;; )))
-;;;
-;;; ;; work item
-;;; ;;
-;;; (defstruct witem
-;;; (rhost #f) ;; return host
-;;; (ripaddr #f) ;; return ipaddr
-;;; (rport #f) ;; return port
-;;; (servkey #f) ;; the packet representing the client of this workitem, used by final send-message
-;;; (rdat #f) ;; the request - usually an sql query, type is rdat
-;;; (action #f) ;; the action: immediate, dbwrite, dbread,oslong, osshort
-;;; (cookie #f) ;; cookie id for response
-;;; (data #f) ;; the data payload, i.e. parameters
-;;; (result #f) ;; the result from processing the data
-;;; (caller #f)) ;; the calling peer according to rpc itself
-;;;
-;;; (define (trim-pktid pktid)
-;;; (if (string? pktid)
-;;; (substring pktid 0 4)
-;;; "nopkt"))
-;;;
-;;; (define (any->number num)
-;;; (cond
-;;; ((number? num) num)
-;;; ((string? num) (string->number num))
-;;; (else num)))
-;;;
-;;; (use trace)
-;;; (trace-call-sites #t)
-;;;
-;;; ;;======================================================================
-;;; ;; D A T A B A S E H A N D L I N G
-;;; ;;======================================================================
-;;;
-;;; ;; look in dbhandles for a db, return it, else return #f
-;;; ;;
-;;; (define (get-dbh acfg fname)
-;;; (let ((dbh-lst (hash-table-ref/default (area-dbhandles acfg) fname '())))
-;;; (if (null? dbh-lst)
-;;; (begin
-;;; ;; (print "opening db for " fname)
-;;; (open-db acfg fname)) ;; Note that the handles get put back in the queue in the save-dbh calls
-;;; (let ((rem-lst (cdr dbh-lst)))
-;;; ;; (print "re-using saved connection for " fname)
-;;; (hash-table-set! (area-dbhandles acfg) fname rem-lst)
-;;; (car dbh-lst)))))
-;;;
-;;; (define (save-dbh acfg fname dbdat)
-;;; ;; (print "saving dbh for " fname)
-;;; (hash-table-set! (area-dbhandles acfg) fname (cons dbdat (hash-table-ref/default (area-dbhandles acfg) fname '()))))
-;;;
-;;; ;; open the database, if never before opened init it. put the handle in the
-;;; ;; open db's hash table
-;;; ;; returns: the dbdat
-;;; ;;
-;;; (define (open-db acfg fname)
-;;; (let* ((fullname (conc (area-dbdir acfg) "/" fname))
-;;; (exists (file-exists? fullname))
-;;; (write-access (if exists
-;;; (file-write-access? fullname)
-;;; (file-write-access? (area-dbdir acfg))))
-;;; (db (sqlite3:open-database fullname))
-;;; (handler (sqlite3:make-busy-timeout 136000))
-;;; )
-;;; (sqlite3:set-busy-handler! db handler)
-;;; (sqlite3:execute db "PRAGMA synchronous = 0;")
-;;; (if (not exists) ;; need to init the db
-;;; (if write-access
-;;; (let ((isql (get-rsql acfg 'dbinitsql))) ;; get the init sql statements
-;;; ;; (sqlite3:with-transaction
-;;; ;; db
-;;; ;; (lambda ()
-;;; (if isql
-;;; (for-each
-;;; (lambda (sql)
-;;; (sqlite3:execute db sql))
-;;; isql)))
-;;; (print "ERROR: no write access to " (area-dbdir acfg))))
-;;; (make-dbdat dbh: db fname: fname write-access: write-access)))
-;;;
-;;; ;; This is a low-level command to retrieve or to prepare, save and return a prepared statment
-;;; ;; you must extract the db handle
-;;; ;;
-;;; (define (get-sth db cache stmt)
-;;; (if (hash-table-exists? cache stmt)
-;;; (begin
-;;; ;; (print "Reusing cached stmt for " stmt)
-;;; (hash-table-ref/default cache stmt #f))
-;;; (let ((sth (sqlite3:prepare db stmt)))
-;;; (hash-table-set! cache stmt sth)
-;;; ;; (print "prepared stmt for " stmt)
-;;; sth)))
-;;;
-;;; ;; a little more expensive but does all the tedious deferencing - only use if you don't already
-;;; ;; have dbdat and db sitting around
-;;; ;;
-;;; (define (full-get-sth acfg fname stmt)
-;;; (let* ((dbdat (get-dbh acfg fname))
-;;; (db (dbdat-dbh dbdat))
-;;; (sths (dbdat-sths dbdat)))
-;;; (get-sth db sths stmt)))
-;;;
-;;; ;; write to a db
-;;; ;; acfg: area data
-;;; ;; rdat: request data
-;;; ;; hdat: (host . port)
-;;; ;;
-;;; ;; (define (dbwrite acfg rdat hdat data-in)
-;;; ;; (let* ((dbname (car data-in))
-;;; ;; (dbdat (get-dbh acfg dbname))
-;;; ;; (db (dbdat-dbh dbdat))
-;;; ;; (sths (dbdat-sths dbdat))
-;;; ;; (stmt (calldat-obj rdat))
-;;; ;; (sth (get-sth db sths stmt))
-;;; ;; (data (cdr data-in)))
-;;; ;; (print "dbname: " dbname " acfg: " acfg " rdat: " (calldat->alist rdat) " hdat: " hdat " data: " data)
-;;; ;; (print "dbdat: " (dbdat->alist dbdat))
-;;; ;; (apply sqlite3:execute sth data)
-;;; ;; (save-dbh acfg dbname dbdat)
-;;; ;; #t
-;;; ;; ))
-;;;
-;;; (define (finalize-all-db-handles acfg)
-;;; (let* ((dbhandles (area-dbhandles acfg)) ;; dbhandles is hash of fname ==> dbdat
-;;; (num 0))
-;;; (for-each
-;;; (lambda (area-name)
-;;; (print "Closing handles for " area-name)
-;;; (let ((dbdats (hash-table-ref/default dbhandles area-name '())))
-;;; (for-each
-;;; (lambda (dbdat)
-;;; ;; first close all statement handles
-;;; (for-each
-;;; (lambda (sth)
-;;; (sqlite3:finalize! sth)
-;;; (set! num (+ num 1)))
-;;; (hash-table-values (dbdat-sths dbdat)))
-;;; ;; now close the dbh
-;;; (set! num (+ num 1))
-;;; (sqlite3:finalize! (dbdat-dbh dbdat)))
-;;; dbdats)))
-;;; (hash-table-keys dbhandles))
-;;; (print "FINALIZED " num " dbhandles")))
-;;;
-;;; ;;======================================================================
-;;; ;; W O R K Q U E U E H A N D L I N G
-;;; ;;======================================================================
-;;;
-;;; (define (register-db-as-mine acfg dbname)
-;;; (let ((ht (area-dbs acfg)))
-;;; (if (not (hash-table-ref/default ht dbname #f))
-;;; (hash-table-set! ht dbname (random 10000)))))
-;;;
-;;; (define (work-queue-add acfg fname witem)
-;;; (let* ((work-queue-start (current-milliseconds))
-;;; (action (witem-action witem)) ;; NB the action is the index into the rdat actions
-;;; (qdat (or (hash-table-ref/default (area-wqueues acfg) fname #f)
-;;; (let ((newqdat (make-qdat)))
-;;; (hash-table-set! (area-wqueues acfg) fname newqdat)
-;;; newqdat)))
-;;; (rdat (hash-table-ref/default (area-rtable acfg) action #f)))
-;;; (if rdat
-;;; (queue-add!
-;;; (case (calldat-ctype rdat)
-;;; ((dbwrite) (register-db-as-mine acfg fname)(qdat-writeq qdat))
-;;; ((dbread) (register-db-as-mine acfg fname)(qdat-readq qdat))
-;;; ((dbrw) (register-db-as-mine acfg fname)(qdat-rwq qdat))
-;;; ((oslong) (qdat-oslong qdat))
-;;; ((osshort) (qdat-osshort qdat))
-;;; ((full-ping) (qdat-misc qdat))
-;;; (else
-;;; (print "ERROR: no queue for " action ". Adding to dbwrite queue.")
-;;; (qdat-writeq qdat)))
-;;; witem)
-;;; (case action
-;;; ((full-ping)(qdat-misc qdat))
-;;; (else
-;;; (print "ERROR: No action " action " was registered"))))
-;;; (sdbg> "work-queue-add" "queue-add" work-queue-start #f #f)
-;;; #t)) ;; for now, simply return #t to indicate request got to the queue
-;;;
-;;; (define (doqueue acfg q fname dbdat dbh)
-;;; ;; (print "doqueue: " fname)
-;;; (let* ((start-time (current-milliseconds))
-;;; (qlen (queue-length q)))
-;;; (if (> qlen 1)
-;;; (print "Processing queue of length " qlen))
-;;; (let loop ((count 0)
-;;; (responses '()))
-;;; (let ((delta (- (current-milliseconds) start-time)))
-;;; (if (or (queue-empty? q)
-;;; (> delta 400)) ;; stop working on this queue after 400ms have passed
-;;; (list count delta responses) ;; return count, delta and responses list
-;;; (let* ((witem (queue-remove! q))
-;;; (action (witem-action witem))
-;;; (rdat (witem-rdat witem))
-;;; (stmt (calldat-obj rdat))
-;;; (sth (full-get-sth acfg fname stmt))
-;;; (ctype (calldat-ctype rdat))
-;;; (data (witem-data witem))
-;;; (cookie (witem-cookie witem)))
-;;; ;; do the processing and save the result in witem-result
-;;; (witem-result-set!
-;;; witem
-;;; (case ctype ;; action
-;;; ((noblockwrite) ;; blind write, no ack of success returned
-;;; (apply sqlite3:execute sth data)
-;;; (sqlite3:last-insert-rowid dbh))
-;;; ((dbwrite) ;; blocking write
-;;; (apply sqlite3:execute sth data)
-;;; #t)
-;;; ((dbread) ;; TODO: consider breaking this up and shipping in pieces for large query
-;;; (apply sqlite3:map-row (lambda x x) sth data))
-;;; ((full-ping) 'full-ping)
-;;; (else (print "Not ready for action " action) #f)))
-;;; (loop (add1 count)
-;;; (if cookie
-;;; (cons witem responses)
-;;; responses))))))))
-;;;
-;;; ;; do up to 400ms of processing on each queue
-;;; ;; - the work-queue-processor will allow the max 1200ms of work to complete but it will flag as overloaded
-;;; ;;
-;;; (define (process-db-queries acfg fname)
-;;; (if (hash-table-exists? (area-wqueues acfg) fname)
-;;; (let* ((process-db-queries-start-time (current-milliseconds))
-;;; (qdat (hash-table-ref/default (area-wqueues acfg) fname #f))
-;;; (queue-sym->queue (lambda (queue-sym)
-;;; (case queue-sym ;; lookup the queue from qdat given a name (symbol)
-;;; ((wqueue) (qdat-writeq qdat))
-;;; ((rqueue) (qdat-readq qdat))
-;;; ((rwqueue) (qdat-rwq qdat))
-;;; ((misc) (qdat-misc qdat))
-;;; (else #f))))
-;;; (dbdat (get-dbh acfg fname))
-;;; (dbh (if (dbdat? dbdat)(dbdat-dbh dbdat) #f))
-;;; (nowtime (current-seconds)))
-;;; ;; handle the queues that require a transaction
-;;; ;;
-;;; (map ;;
-;;; (lambda (queue-sym)
-;;; ;; (print "processing queue " queue-sym)
-;;; (let* ((queue (queue-sym->queue queue-sym)))
-;;; (if (not (queue-empty? queue))
-;;; (let ((responses
-;;; (sqlite3:with-transaction ;; todo - catch exceptions...
-;;; dbh
-;;; (lambda ()
-;;; (let* ((res (doqueue acfg queue fname dbdat dbh))) ;; this does the work!
-;;; ;; (print "res=" res)
-;;; (match res
-;;; ((count delta responses)
-;;; (update-stats acfg fname queue-sym delta count)
-;;; (sdbg> "process-db-queries" "sqlite3-transaction" process-db-queries-start-time #f #f)
-;;; responses) ;; return responses
-;;; (else
-;;; (print "ERROR: bad return data from doqueue " res)))
-;;; )))))
-;;; ;; having completed the transaction, send the responses.
-;;; ;; (print "INFO: sending " (length responses) " responses.")
-;;; (let loop ((responses-left responses))
-;;; (cond
-;;; ((null? responses-left) #t)
-;;; (else
-;;; (let* ((witem (car responses-left))
-;;; (response (cdr responses-left)))
-;;; (call-deliver-response acfg (witem-ripaddr witem)(witem-rport witem)
-;;; (witem-cookie witem)(witem-result witem)))
-;;; (loop (cdr responses-left))))))
-;;; )))
-;;; '(wqueue rwqueue rqueue))
-;;;
-;;; ;; handle misc queue
-;;; ;;
-;;; ;; (print "processing misc queue")
-;;; (let ((queue (queue-sym->queue 'misc)))
-;;; (doqueue acfg queue fname dbdat dbh))
-;;; ;; ....
-;;; (save-dbh acfg fname dbdat)
-;;; #t ;; just to let the tests know we got here
-;;; )
-;;; #f ;; nothing processed
-;;; ))
-;;;
-;;; ;; run all queues in parallel per db but sequentially per queue for that db.
-;;; ;; - process the queues every 500 or so ms
-;;; ;; - allow for long running queries to continue but all other activities for that
-;;; ;; db will be blocked.
-;;; ;;
-;;; (define (work-queue-processor acfg)
-;;; (let* ((threads (make-hash-table))) ;; fname => thread
-;;; (let loop ((fnames (hash-table-keys (area-wqueues acfg)))
-;;; (target-time (+ (current-milliseconds) 50)))
-;;; ;;(if (not (null? fnames))(print "Processing for these databases: " fnames))
-;;; (for-each
-;;; (lambda (fname)
-;;; ;; (print "processing for " fname)
-;;; ;;(process-db-queries acfg fname))
-;;; (let ((th (hash-table-ref/default threads fname #f)))
-;;; (if (and th (not (member (thread-state th) '(dead terminated))))
-;;; (begin
-;;; (print "WARNING: worker thread for " fname " is taking a long time.")
-;;; (print "Thread is in state " (thread-state th)))
-;;; (let ((th1 (make-thread (lambda ()
-;;; ;; (catch-and-dump
-;;; ;; (lambda ()
-;;; ;; (print "Process queries for " fname)
-;;; (let ((start-time (current-milliseconds)))
-;;; (process-db-queries acfg fname)
-;;; ;; (thread-sleep! 0.01) ;; need the thread to take at least some time
-;;; (hash-table-delete! threads fname)) ;; no mutexes?
-;;; fname)
-;;; "th1"))) ;; ))
-;;; (hash-table-set! threads fname th1)
-;;; (thread-start! th1)))))
-;;; fnames)
-;;; ;; (thread-sleep! 0.1) ;; give the threads some time to process requests
-;;; ;; burn time until 400ms is up
-;;; (let ((now-time (current-milliseconds)))
-;;; (if (< now-time target-time)
-;;; (let ((delta (- target-time now-time)))
-;;; (thread-sleep! (/ delta 1000)))))
-;;; (loop (hash-table-keys (area-wqueues acfg))
-;;; (+ (current-milliseconds) 50)))))
-;;;
-;;; ;;======================================================================
-;;; ;; S T A T S G A T H E R I N G
-;;; ;;======================================================================
-;;;
-;;; (defstruct stat
-;;; (qcount-avg 0) ;; coarse running average
-;;; (qtime-avg 0) ;; coarse running average
-;;; (qcount 0) ;; total
-;;; (qtime 0) ;; total
-;;; (last-qcount 0) ;; last
-;;; (last-qtime 0) ;; last
-;;; (dbs '()) ;; list of db files handled by this node
-;;; (when 0)) ;; when the last query happened - seconds
-;;;
-;;;
-;;; (define (update-stats acfg fname bucket duration numqueries)
-;;; (let* ((key fname) ;; for now do not use bucket. Was: (conc fname "-" bucket)) ;; lazy but good enough
-;;; (stats (or (hash-table-ref/default (area-stats acfg) key #f)
-;;; (let ((newstats (make-stat)))
-;;; (hash-table-set! (area-stats acfg) key newstats)
-;;; newstats))))
-;;; ;; when the last query happended (used to remove the fname from the active list)
-;;; (stat-when-set! stats (current-seconds))
-;;; ;; last values
-;;; (stat-last-qcount-set! stats numqueries)
-;;; (stat-last-qtime-set! stats duration)
-;;; ;; total over process lifetime
-;;; (stat-qcount-set! stats (+ (stat-qcount stats) numqueries))
-;;; (stat-qtime-set! stats (+ (stat-qtime stats) duration))
-;;; ;; coarse average
-;;; (stat-qcount-avg-set! stats (/ (+ (stat-qcount-avg stats) numqueries) 2))
-;;; (stat-qtime-avg-set! stats (/ (+ (stat-qtime-avg stats) duration) 2))
-;;;
-;;; ;; here is where we add the stats for a given dbfile
-;;; (if (not (member fname (stat-dbs stats)))
-;;; (stat-dbs-set! stats (cons fname (stat-dbs stats))))
-;;;
-;;; ))
-;;;
-;;; ;;======================================================================
-;;; ;; S E R V E R S T U F F
-;;; ;;======================================================================
-;;;
-;;; ;; this does NOT return!
-;;; ;;
-;;; (define (find-free-port-and-open acfg)
-;;; (let ((port (or (area-port acfg) 3200)))
-;;; (handle-exceptions
-;;; exn
-;;; (begin
-;;; (print "INFO: cannot bind to port " (rpc:default-server-port) ", trying next port")
-;;; (area-port-set! acfg (+ port 1))
-;;; (find-free-port-and-open acfg))
-;;; (rpc:default-server-port port)
-;;; (area-port-set! acfg port)
-;;; (tcp-read-timeout 120000)
-;;; ;; ((rpc:make-server (tcp-listen port)) #t)
-;;; (tcp-listen (rpc:default-server-port)
-;;; ))))
-;;;
-;;; ;; register this node by putting a packet into the pkts dir.
-;;; ;; look for other servers
-;;; ;; contact other servers and compile list of servers
-;;; ;; there are two types of server
-;;; ;; main servers - dashboards, runners and dedicated servers - need pkt
-;;; ;; passive servers - test executers, step calls, list-runs - no pkt
-;;; ;;
-;;; (define (register-node acfg hostip port-num)
-;;; ;;(mutex-lock! (area-mutex acfg))
-;;; (let* ((server-type (area-server-type acfg)) ;; auto, main, passive (no pkt created)
-;;; (best-ip (or hostip (get-my-best-address)))
-;;; (mtdir (area-dbdir acfg))
-;;; (pktdir (area-pktsdir acfg))) ;; conc mtdir "/.server-pkts")))
-;;; (print "Registering node " best-ip ":" port-num)
-;;; (if (not mtdir) ;; require a home for this node to put or find databases
-;;; #f
-;;; (begin
-;;; (if (not (directory? pktdir))(create-directory pktdir))
-;;; ;; server is started, now create pkt if needed
-;;; (print "Starting server in " server-type " mode with port " port-num)
-;;; (if (member server-type '(auto main)) ;; TODO: if auto, count number of servers registers, if > 3 then don't put out a pkt
-;;; (begin
-;;; (area-pktid-set! acfg
-;;; (write-alist->pkt
-;;; pktdir
-;;; `((hostname . ,(get-host-name))
-;;; (ipaddr . ,best-ip)
-;;; (port . ,port-num)
-;;; (pid . ,(current-process-id)))
-;;; pktspec: *pktspec*
-;;; ptype: 'server))
-;;; (area-pktfile-set! acfg (conc pktdir "/" (area-pktid acfg) ".pkt"))))
-;;; (area-port-set! acfg port-num)
-;;; #;(mutex-unlock! (area-mutex acfg))))))
-;;;
-;;; (define *cookie-seqnum* 0)
-;;; (define (make-cookie key)
-;;; (set! *cookie-seqnum* (add1 *cookie-seqnum*))
-;;; ;;(print "MAKE COOKIE CALLED -- on "servkey"-"*cookie-seqnum*)
-;;; (conc key "-" *cookie-seqnum*)
-;;; )
-;;;
-;;; ;; dispatch locally if possible
-;;; ;;
-;;; (define (call-deliver-response acfg ipaddr port cookie data)
-;;; (if (and (equal? (area-myaddr acfg) ipaddr)
-;;; (equal? (area-port acfg) port))
-;;; (deliver-response acfg cookie data)
-;;; ((rpc:procedure 'response ipaddr port) cookie data)))
-;;;
-;;; (define (deliver-response acfg cookie data)
-;;; (let ((deliver-response-start (current-milliseconds)))
-;;; (thread-start! (make-thread
-;;; (lambda ()
-;;; (let loop ((tries-left 5))
-;;; ;;(print "TOP OF DELIVER_RESPONSE LOOP; triesleft="tries-left)
-;;; ;;(pp (hash-table->alist (area-cookie2mbox acfg)))
-;;; (let* ((mbox (hash-table-ref/default (area-cookie2mbox acfg) cookie #f)))
-;;; (cond
-;;; ((eq? 0 tries-left)
-;;; (print "ulex:deliver-response: I give up. Mailbox never appeared. cookie="cookie)
-;;; )
-;;; (mbox
-;;; ;;(print "got mbox="mbox" got data="data" send.")
-;;; (mailbox-send! mbox data))
-;;; (else
-;;; ;;(print "no mbox yet. look for "cookie)
-;;; (thread-sleep! (/ (- 6 tries-left) 10))
-;;; (loop (sub1 tries-left))))))
-;;; ;; (debug-pp (list (conc "ulex:deliver-response took " (- (current-milliseconds) deliver-response-start) " ms, cookie=" cookie " data=") data))
-;;; (sdbg> "deliver-response" "mailbox-send" deliver-response-start #f #f cookie)
-;;; )
-;;; (conc "deliver-response thread for cookie="cookie))))
-;;; #t)
-;;;
-;;; ;; action:
-;;; ;; immediate - quick actions, no need to put in queues
-;;; ;; dbwrite - put in dbwrite queue
-;;; ;; dbread - put in dbread queue
-;;; ;; oslong - os actions, e.g. du, that could take a long time
-;;; ;; osshort - os actions that should be quick, e.g. df
-;;; ;;
-;;; (define (request acfg from-ipaddr from-port servkey action cookie fname params) ;; std-peer-handler
-;;; ;; NOTE: Use rpc:current-peer for getting return address
-;;; (let* ((std-peer-handler-start (current-milliseconds))
-;;; ;; (raw-data (alist-ref 'data dat))
-;;; (rdat (hash-table-ref/default
-;;; (area-rtable acfg) action #f)) ;; this looks up the sql query or other details indexed by the action
-;;; (witem (make-witem ripaddr: from-ipaddr ;; rhost: from-host
-;;; rport: from-port action: action
-;;; rdat: rdat cookie: cookie
-;;; servkey: servkey data: params ;; TODO - rename data to params
-;;; caller: (rpc:current-peer))))
-;;; (if (not (equal? servkey (area-pktid acfg)))
-;;; `(#f . ,(conc "I don't know you servkey=" servkey ", pktid=" (area-pktid acfg))) ;; immediately return this
-;;; (let* ((ctype (if rdat
-;;; (calldat-ctype rdat) ;; is this necessary? these should be identical
-;;; action)))
-;;; (sdbg> "std-peer-handler" "immediate" std-peer-handler-start #f #f)
-;;; (case ctype
-;;; ;; (dbwrite acfg rdat (cons from-ipaddr from-port) data)))
-;;; ((full-ping) `(#t "ack to full ping" ,(work-queue-add acfg fname witem) ,cookie))
-;;; ((response) `(#t "ack from requestor" ,(deliver-response acfg fname params)))
-;;; ((dbwrite) `(#t "db write submitted" ,(work-queue-add acfg fname witem) ,cookie))
-;;; ((dbread) `(#t "db read submitted" ,(work-queue-add acfg fname witem) ,cookie ))
-;;; ((dbrw) `(#t "db read/write submitted" ,cookie))
-;;; ((osshort) `(#t "os short submitted" ,cookie))
-;;; ((oslong) `(#t "os long submitted" ,cookie))
-;;; (else `(#f "unrecognised action" ,ctype)))))))
-;;;
-;;; ;; Call this to start the actual server
-;;; ;;
-;;; ;; start_server
-;;; ;;
-;;; ;; mode: '
-;;; ;; handler: proc which takes pktrecieved as argument
-;;; ;;
-;;;
-;;; (define (start-server acfg)
-;;; (let* ((conn (find-free-port-and-open acfg))
-;;; (port (area-port acfg)))
-;;; (rpc:publish-procedure!
-;;; 'delist-db
-;;; (lambda (fname)
-;;; (hash-table-delete! (area-dbs acfg) fname)))
-;;; (rpc:publish-procedure!
-;;; 'calling-addr
-;;; (lambda ()
-;;; (rpc:current-peer)))
-;;; (rpc:publish-procedure!
-;;; 'ping
-;;; (lambda ()(real-ping acfg)))
-;;; (rpc:publish-procedure!
-;;; 'request
-;;; (lambda (from-addr from-port servkey action cookie dbname params)
-;;; (request acfg from-addr from-port servkey action cookie dbname params)))
-;;; (rpc:publish-procedure!
-;;; 'response
-;;; (lambda (cookie res-dat)
-;;; (deliver-response acfg cookie res-dat)))
-;;; (area-ready-set! acfg #t)
-;;; (area-conn-set! acfg conn)
-;;; ((rpc:make-server conn) #f)));; ((tcp-listen (rpc:default-server-port)) #t)
-;;;
-;;;
-;;; (define (launch acfg) ;; #!optional (proc std-peer-handler))
-;;; (print "starting launch")
-;;; (update-known-servers acfg) ;; gotta do this on every start (thus why limit number of publicised servers)
-;;; #;(let ((original-handler (current-exception-handler))) ;; is th
-;;; (lambda (exception)
-;;; (server-exit-procedure)
-;;; (original-handler exception)))
-;;; (on-exit (lambda ()
-;;; (shutdown acfg))) ;; (finalize-all-db-handles acfg)))
-;;; ;; set up the rpc handler
-;;; (let* ((th1 (make-thread
-;;; (lambda ()(start-server acfg))
-;;; "server thread"))
-;;; (th2 (make-thread
-;;; (lambda ()
-;;; (print "th2 starting")
-;;; (let loop ()
-;;; (work-queue-processor acfg)
-;;; (print "work-queue-processor crashed!")
-;;; (loop)))
-;;; "work queue thread")))
-;;; (thread-start! th1)
-;;; (thread-start! th2)
-;;; (let loop ()
-;;; (thread-sleep! 0.025)
-;;; (if (area-ready acfg)
-;;; #t
-;;; (loop)))
-;;; ;; attempt to fix my address
-;;; (let* ((all-addr (get-all-ips-sorted))) ;; could use (tcp-addresses conn)?
-;;; (let loop ((rem-addrs all-addr))
-;;; (if (null? rem-addrs)
-;;; (begin
-;;; (print "ERROR: Failed to figure out the ip address of myself as a server. Giving up.")
-;;; (exit 1)) ;; BUG Changeme to raising an exception
-;;;
-;;; (let* ((addr (car rem-addrs))
-;;; (good-addr (handle-exceptions
-;;; exn
-;;; #f
-;;; ((rpc:procedure 'calling-addr addr (area-port acfg))))))
-;;; (if good-addr
-;;; (begin
-;;; (print "Got good-addr of " good-addr)
-;;; (area-myaddr-set! acfg good-addr))
-;;; (loop (cdr rem-addrs)))))))
-;;; (register-node acfg (area-myaddr acfg)(area-port acfg))
-;;; (print "INFO: Server started on " (area-myaddr acfg) ":" (area-port acfg))
-;;; ;; (update-known-servers acfg) ;; gotta do this on every start (thus why limit number of publicised servers)
-;;; ))
-;;;
-;;; (define (clear-server-pkt acfg)
-;;; (let ((pktf (area-pktfile acfg)))
-;;; (if pktf (delete-file* pktf))))
-;;;
-;;; (define (shutdown acfg)
-;;; (let (;;(conn (area-conn acfg))
-;;; (pktf (area-pktfile acfg))
-;;; (port (area-port acfg)))
-;;; (if pktf (delete-file* pktf))
-;;; (send-all "imshuttingdown")
-;;; ;; (rpc:close-all-connections!) ;; don't know if this is actually needed
-;;; (finalize-all-db-handles acfg)))
-;;;
-;;; (define (send-all msg)
-;;; #f)
-;;;
-;;; ;; given a area record look up all the packets
-;;; ;;
-;;; (define (get-all-server-pkts acfg)
-;;; (let ((all-pkt-files (glob (conc (area-pktsdir acfg) "/*.pkt"))))
-;;; (map (lambda (pkt-file)
-;;; (read-pkt->alist pkt-file pktspec: *pktspec*))
-;;; all-pkt-files)))
-;;;
-;;; #;((Z . "9a0212302295a19610d5796fce0370fa130758e9")
-;;; (port . "34827")
-;;; (pid . "28748")
-;;; (hostname . "zeus")
-;;; (T . "server")
-;;; (D . "1549427032.0"))
-;;;
-;;; #;(define (get-my-best-address)
-;;; (let ((all-my-addresses (get-all-ips))) ;; (vector->list (hostinfo-addresses (hostname->hostinfo (get-host-name))))))
-;;; (cond
-;;; ((null? all-my-addresses)
-;;; (get-host-name)) ;; no interfaces?
-;;; ((eq? (length all-my-addresses) 1)
-;;; (ip->string (car all-my-addresses))) ;; only one to choose from, just go with it
-;;; (else
-;;; (ip->string (car (filter (lambda (x) ;; take any but 127.
-;;; (not (eq? (u8vector-ref x 0) 127)))
-;;; all-my-addresses)))))))
-;;;
-;;; ;; whoami? I am my pkt
-;;; ;;
-;;; (define (whoami? acfg)
-;;; (hash-table-ref/default (area-hosts acfg)(area-pktid acfg) #f))
-;;;
-;;; ;;======================================================================
-;;; ;; "Client side" operations
-;;; ;;======================================================================
-;;;
-;;; (define (safe-call call-key host port . params)
-;;; (handle-exceptions
-;;; exn
-;;; (begin
-;;; (print "Call " call-key " to " host ":" port " failed")
-;;; #f)
-;;; (apply (rpc:procedure call-key host port) params)))
-;;;
-;;; ;; ;; convert to/from string / sexpr
-;;; ;;
-;;; ;; (define (string->sexpr str)
-;;; ;; (if (string? str)
-;;; ;; (with-input-from-string str read)
-;;; ;; str))
-;;; ;;
-;;; ;; (define (sexpr->string s)
-;;; ;; (with-output-to-string (lambda ()(write s))))
-;;;
-;;; ;; is the server alive?
-;;; ;;
-;;; (define (ping acfg host port)
-;;; (let* ((myaddr (area-myaddr acfg))
-;;; (myport (area-port acfg))
-;;; (start-time (current-milliseconds))
-;;; (res (if (and (equal? myaddr host)
-;;; (equal? myport port))
-;;; (real-ping acfg)
-;;; ((rpc:procedure 'ping host port)))))
-;;; (cons (- (current-milliseconds) start-time)
-;;; res)))
-;;;
-;;; ;; returns ( ipaddr port alist-fname=>randnum )
-;;; (define (real-ping acfg)
-;;; `(,(area-myaddr acfg) ,(area-port acfg) ,(get-host-stats acfg)))
-;;;
-;;; ;; is the server alive AND the queues processing?
-;;; ;;
-;;; #;(define (full-ping acfg servpkt)
-;;; (let* ((start-time (current-milliseconds))
-;;; (res (send-message acfg servpkt '(full-ping) 'full-ping)))
-;;; (cons (- (current-milliseconds) start-time)
-;;; res))) ;; (equal? res "got ping"))))
-;;;
-;;;
-;;; ;; look up all pkts and get the server id (the hash), port, host/ip
-;;; ;; store this info in acfg
-;;; ;; return the number of responsive servers found
-;;; ;;
-;;; ;; DO NOT VERIFY THAT THE SERVER IS ALIVE HERE. This is called at times where the current server is not yet alive and cannot ping itself
-;;; ;;
-;;; (define (update-known-servers acfg)
-;;; ;; readll all pkts
-;;; ;; foreach pkt; if it isn't me ping the server; if alive, add to hosts hash, else rm the pkt
-;;; (let* ((start-time (current-milliseconds))
-;;; (all-pkts (delete-duplicates
-;;; (append (get-all-server-pkts acfg)
-;;; (hash-table-values (area-hosts acfg)))))
-;;; (hostshash (area-hosts acfg))
-;;; (my-id (area-pktid acfg))
-;;; (pktsdir (area-pktsdir acfg)) ;; needed to remove pkts from non-responsive servers
-;;; (numsrvs 0)
-;;; (delpkt (lambda (pktsdir sid)
-;;; (print "clearing out server " sid)
-;;; (delete-file* (conc pktsdir "/" sid ".pkt"))
-;;; (hash-table-delete! hostshash sid))))
-;;; (area-last-srvup-set! acfg (current-seconds))
-;;; (for-each
-;;; (lambda (servpkt)
-;;; (if (list? servpkt)
-;;; ;; (pp servpkt)
-;;; (let* ((shost (alist-ref 'ipaddr servpkt))
-;;; (sport (any->number (alist-ref 'port servpkt)))
-;;; (res (handle-exceptions
-;;; exn
-;;; (begin
-;;; ;; (print "INFO: bad server on " shost ":" sport)
-;;; #f)
-;;; (ping acfg shost sport)))
-;;; (sid (alist-ref 'Z servpkt)) ;; Z code is our name for the server
-;;; (url (conc shost ":" sport))
-;;; )
-;;; #;(if (or (not res)
-;;; (null? res))
-;;; (begin
-;;; (print "STRANGE: ping of " url " gave " res)))
-;;;
-;;; ;; (print "Got " res " from " shost ":" sport)
-;;; (match res
-;;; ((qduration . payload)
-;;; ;; (print "Server pkt:" (alist-ref 'ipaddr servpkt) ":" (alist-ref 'port servpkt)
-;;; ;; (if payload
-;;; ;; "Success" "Fail"))
-;;; (match payload
-;;; ((host port stats)
-;;; ;; (print "From " host ":" port " got stats: " stats)
-;;; (if (and host port stats)
-;;; (let ((url (conc host ":" port)))
-;;; (hash-table-set! hostshash sid servpkt)
-;;; ;; store based on host:port
-;;; (hash-table-set! (area-hoststats acfg) sid stats))
-;;; (print "missing data from the server, not sure what that means!"))
-;;; (set! numsrvs (+ numsrvs 1)))
-;;; (#f
-;;; (print "Removing pkt " sid " due to #f from server or failed ping")
-;;; (delpkt pktsdir sid))
-;;; (else
-;;; (print "Got ")(pp res)(print " from server ")(pp servpkt) " but response did not match (#f/#t . msg)")))
-;;; (else
-;;; ;; here we delete the pkt - can't reach the server, remove it
-;;; ;; however this logic is inadequate. we should mark the server as checked
-;;; ;; and not good, if it happens a second time - then remove the pkt
-;;; ;; or something similar. I.e. don't be too quick to assume the server is wedged or dead
-;;; ;; could be it is simply too busy to reply
-;;; (let ((bad-pings (hash-table-ref/default (area-health acfg) url 0)))
-;;; (if (> bad-pings 1) ;; two bad pings - remove pkt
-;;; (begin
-;;; (print "INFO: " bad-pings " bad responses from " url ", deleting pkt " sid)
-;;; (delpkt pktsdir sid))
-;;; (begin
-;;; (print "INFO: " bad-pings " bad responses from " shost ":" sport " not deleting pkt yet")
-;;; (hash-table-set! (area-health acfg)
-;;; url
-;;; (+ (hash-table-ref/default (area-health acfg) url 0) 1))
-;;; ))
-;;; ))))
-;;; ;; servpkt is not actually a pkt?
-;;; (begin
-;;; (print "Bad pkt " servpkt))))
-;;; all-pkts)
-;;; (sdbg> "update-known-servers" "end" start-time #f #f " found " numsrvs
-;;; " servers, pkts: " (map (lambda (p)
-;;; (alist-ref 'Z p))
-;;; all-pkts))
-;;; numsrvs))
-;;;
-;;; (defstruct srvstat
-;;; (numfiles 0) ;; number of db files handled by this server - subtract 1 for the db being currently looked at
-;;; (randnum #f) ;; tie breaker number assigned to by the server itself - applies only to the db under consideration
-;;; (pkt #f)) ;; the server pkt
-;;;
-;;; ;;(define (srv->srvstat srvpkt)
-;;;
-;;; ;; Get the server best for given dbname and key
-;;; ;;
-;;; ;; NOTE: key is not currently used. The key points to the kind of query, this may be useful for directing read-only queries.
-;;; ;;
-;;; (define (get-best-server acfg dbname key)
-;;; (let* (;; (servers (hash-table-values (area-hosts acfg)))
-;;; (servers (area-hosts acfg))
-;;; (skeys (sort (hash-table-keys servers) string>=?)) ;; a stable listing
-;;; (start-time (current-milliseconds))
-;;; (srvstats (make-hash-table)) ;; srvid => srvstat
-;;; (url (conc (area-myaddr acfg) ":" (area-port acfg))))
-;;; ;; (print "scores for " dbname ": " (map (lambda (k)(cons k (calc-server-score acfg dbname k))) skeys))
-;;; (if (null? skeys)
-;;; (if (> (update-known-servers acfg) 0)
-;;; (get-best-server acfg dbname key) ;; some risk of infinite loop here, TODO add try counter
-;;; (begin
-;;; (print "ERROR: no server found!") ;; since this process is also a server this should never happen
-;;; #f))
-;;; (begin
-;;; ;; (print "in get-best-server with skeys=" skeys)
-;;; (if (> (- (current-seconds) (area-last-srvup acfg)) 10)
-;;; (begin
-;;; (update-known-servers acfg)
-;;; (sdbg> "get-best-server" "update-known-servers" start-time #f #f)))
-;;;
-;;; ;; for each server look at the list of dbfiles, total number of dbs being handled
-;;; ;; and the rand number, save the best host
-;;; ;; also do a delist-db for each server dbfile not used
-;;; (let* ((best-server #f)
-;;; (servers-to-delist (make-hash-table)))
-;;; (for-each
-;;; (lambda (srvid)
-;;; (let* ((server (hash-table-ref/default servers srvid #f))
-;;; (stats (hash-table-ref/default (area-hoststats acfg) srvid '(()))))
-;;; ;; (print "stats: " stats)
-;;; (if server
-;;; (let* ((dbweights (car stats))
-;;; (srvload (length (filter (lambda (x)(not (equal? dbname (car x)))) dbweights)))
-;;; (dbrec (alist-ref dbname dbweights equal?)) ;; get the pair with fname . randscore
-;;; (randnum (if dbrec
-;;; dbrec ;; (cdr dbrec)
-;;; 0)))
-;;; (hash-table-set! srvstats srvid (make-srvstat numfiles: srvload randnum: randnum pkt: server))))))
-;;; skeys)
-;;;
-;;; (let* ((sorted (sort (hash-table-values srvstats)
-;;; (lambda (a b)
-;;; (let ((numfiles-a (srvstat-numfiles a))
-;;; (numfiles-b (srvstat-numfiles b))
-;;; (randnum-a (srvstat-randnum a))
-;;; (randnum-b (srvstat-randnum b)))
-;;; (if (< numfiles-a numfiles-b) ;; Note, I don't think adding an offset works here. Goal was only move file handling to a different server if it has 2 less
-;;; #t
-;;; (if (and (equal? numfiles-a numfiles-b)
-;;; (< randnum-a randnum-b))
-;;; #t
-;;; #f))))))
-;;; (best (if (null? sorted)
-;;; (begin
-;;; (print "ERROR: should never be null due to self as server.")
-;;; #f)
-;;; (srvstat-pkt (car sorted)))))
-;;; #;(print "SERVER(" url "): " dbname ": " (map (lambda (srv)
-;;; (let ((p (srvstat-pkt srv)))
-;;; (conc (alist-ref 'ipaddr p) ":" (alist-ref 'port p)
-;;; "(" (srvstat-numfiles srv)","(srvstat-randnum srv)")")))
-;;; sorted))
-;;; best))))))
-;;;
-;;; ;; send out an "I'm about to exit notice to all known servers"
-;;; ;;
-;;; (define (death-imminent acfg)
-;;; '())
-;;;
-;;; ;;======================================================================
-;;; ;; U L E X - T H E I N T E R E S T I N G S T U F F ! !
-;;; ;;======================================================================
-;;;
-;;; ;; register a handler
-;;; ;; NOTES:
-;;; ;; dbinitsql is reserved for a list of sql statements for initializing the db
-;;; ;; dbinitfn is reserved for a db init function, if exists called after dbinitsql
-;;; ;;
-;;; (define (register acfg key obj #!optional (ctype 'dbwrite))
-;;; (let ((ht (area-rtable acfg)))
-;;; (if (hash-table-exists? ht key)
-;;; (print "WARNING: redefinition of entry " key))
-;;; (hash-table-set! ht key (make-calldat obj: obj ctype: ctype))))
-;;;
-;;; ;; usage: register-batch acfg '((key1 . sql1) (key2 . sql2) ... )
-;;; ;; NB// obj is often an sql query
-;;; ;;
-;;; (define (register-batch acfg ctype data)
-;;; (let ((ht (area-rtable acfg)))
-;;; (map (lambda (dat)
-;;; (hash-table-set! ht (car dat)(make-calldat obj: (cdr dat) ctype: ctype)))
-;;; data)))
-;;;
-;;; (define (initialize-area-calls-from-specfile area specfile)
-;;; (let* ((callspec (with-input-from-file specfile read )))
-;;; (for-each (lambda (group)
-;;; (register-batch
-;;; area
-;;; (car group)
-;;; (cdr group)))
-;;; callspec)))
-;;;
-;;; ;; get-rentry
-;;; ;;
-;;; (define (get-rentry acfg key)
-;;; (hash-table-ref/default (area-rtable acfg) key #f))
-;;;
-;;; (define (get-rsql acfg key)
-;;; (let ((cdat (get-rentry acfg key)))
-;;; (if cdat
-;;; (calldat-obj cdat)
-;;; #f)))
-;;;
-;;;
-;;;
-;;; ;; blocking call:
-;;; ;; client server
-;;; ;; ------ ------
-;;; ;; call()
-;;; ;; send-message()
-;;; ;; nmsg-send()
-;;; ;; nmsg-receive()
-;;; ;; nmsg-respond(ack,cookie)
-;;; ;; ack, cookie
-;;; ;; mbox-thread-wait(cookie)
-;;; ;; nmsg-send(client,cookie,result)
-;;; ;; nmsg-respond(ack)
-;;; ;; return result
-;;; ;;
-;;; ;; reserved action:
-;;; ;; 'immediate
-;;; ;; 'dbinitsql
-;;; ;;
-;;; (define (call acfg dbname action params #!optional (count 0))
-;;; (let* ((call-start-time (current-milliseconds))
-;;; (srv (get-best-server acfg dbname action))
-;;; (post-get-start-time (current-milliseconds))
-;;; (rdat (hash-table-ref/default (area-rtable acfg) action #f))
-;;; (myid (trim-pktid (area-pktid acfg)))
-;;; (srvid (trim-pktid (alist-ref 'Z srv)))
-;;; (cookie (make-cookie myid)))
-;;; (sdbg> "call" "get-best-server" call-start-time #f call-start-time " from: " myid " to server: " srvid " for " dbname " action: " action " params: " params " rdat: " rdat)
-;;; (print "INFO: call to " (alist-ref 'ipaddr srv) ":" (alist-ref 'port srv) " from " (area-myaddr acfg) ":" (area-port acfg) " for " dbname)
-;;; (if (and srv rdat) ;; need both to dispatch a request
-;;; (let* ((ripaddr (alist-ref 'ipaddr srv))
-;;; (rsrvid (alist-ref 'Z srv))
-;;; (rport (any->number (alist-ref 'port srv)))
-;;; (res-full (if (and (equal? ripaddr (area-myaddr acfg))
-;;; (equal? rport (area-port acfg)))
-;;; (request acfg ripaddr rport (area-pktid acfg) action cookie dbname params)
-;;; (safe-call 'request ripaddr rport
-;;; (area-myaddr acfg)
-;;; (area-port acfg)
-;;; #;(area-pktid acfg)
-;;; rsrvid
-;;; action cookie dbname params))))
-;;; ;; (print "res-full: " res-full)
-;;; (match res-full
-;;; ((response-ok response-msg rem ...)
-;;; (let* ((send-message-time (current-milliseconds))
-;;; ;; (match res-full
-;;; ;; ((response-ok response-msg)
-;;; ;; (response-ok (car res-full))
-;;; ;; (response-msg (cadr res-full)
-;;; )
-;;; ;; (res (take res-full 3))) ;; ctype == action, TODO: converge on one term <<=== what was this? BUG
-;;; ;; (print "ulex:call: send-message took " (- send-message-time post-get-start-time) " ms params=" params)
-;;; (sdbg> "call" "send-message" post-get-start-time #f call-start-time)
-;;; (cond
-;;; ((not response-ok) #f)
-;;; ((member response-msg '("db read submitted" "db write submitted"))
-;;; (let* ((cookie-id (cadddr res-full))
-;;; (mbox (make-mailbox))
-;;; (mbox-time (current-milliseconds)))
-;;; (hash-table-set! (area-cookie2mbox acfg) cookie-id mbox)
-;;; (let* ((mbox-timeout-secs 20)
-;;; (mbox-timeout-result 'MBOX_TIMEOUT)
-;;; (res (mailbox-receive! mbox mbox-timeout-secs mbox-timeout-result))
-;;; (mbox-receive-time (current-milliseconds)))
-;;; (hash-table-delete! (area-cookie2mbox acfg) cookie-id)
-;;; (sdbg> "call" "mailbox-receive" mbox-time #f call-start-time " from: " myid " to server: " srvid " for " dbname)
-;;; ;; (print "ulex:call mailbox-receive took " (- mbox-receive-time mbox-time) "ms params=" params)
-;;; res)))
-;;; (else
-;;; (print "Unhandled response \""response-msg"\"")
-;;; #f))
-;;; ;; depending on what action (i.e. ctype) is we will block here waiting for
-;;; ;; all the data (mechanism to be determined)
-;;; ;;
-;;; ;; if res is a "working on it" then wait
-;;; ;; wait for result
-;;; ;; mailbox thread wait on
-;;;
-;;; ;; if res is a "can't help you" then try a different server
-;;; ;; if res is a "ack" (e.g. for one-shot requests) then return res
-;;; ))
-;;; (else
-;;; (if (< count 10)
-;;; (let* ((url (conc (alist-ref 'ipaddr srv) ":" (alist-ref 'port srv))))
-;;; (thread-sleep! 1)
-;;; (print "ERROR: Bad result from " url ", dbname: " dbname ", action: " action ", params: " params ". Trying again in 1 second.")
-;;; (call acfg dbname action params (+ count 1)))
-;;; (begin
-;;; (error (conc "ERROR: " count " tries, still have improper response res-full=" res-full)))))))
-;;; (begin
-;;; (if (not rdat)
-;;; (print "ERROR: action " action " not registered.")
-;;; (if (< count 10)
-;;; (begin
-;;; (thread-sleep! 1)
-;;; (area-hosts-set! acfg (make-hash-table)) ;; clear out all known hosts
-;;; (print "ERROR: no server found, srv=" srv ", trying again in 1 seconds")
-;;; (call acfg dbname action params (+ count 1)))
-;;; (begin
-;;; (error (conc "ERROR: no server found after 10 tries, srv=" srv ", giving up."))
-;;; #;(error "No server available"))))))))
-;;;
-;;;
-;;; ;;======================================================================
-;;; ;; U T I L I T I E S
-;;; ;;======================================================================
-;;;
-;;; ;; get a signature for identifing this process
-;;; ;;
-;;; (define (get-process-signature)
-;;; (cons (get-host-name)(current-process-id)))
-;;;
-;;; ;;======================================================================
-;;; ;; S Y S T E M S T U F F
-;;; ;;======================================================================
-;;;
-;;; ;; get normalized cpu load by reading from /proc/loadavg and
-;;; ;; /proc/cpuinfo return all three values and the number of real cpus
-;;; ;; and the number of threads returns alist '((adj-cpu-load
-;;; ;; . normalized-proc-load) ... etc. keys: adj-proc-load,
-;;; ;; adj-core-load, 1m-load, 5m-load, 15m-load
-;;; ;;
-;;; (define (get-normalized-cpu-load)
-;;; (let ((res (get-normalized-cpu-load-raw))
-;;; (default `((adj-proc-load . 2) ;; there is no right answer
-;;; (adj-core-load . 2)
-;;; (1m-load . 2)
-;;; (5m-load . 0) ;; causes a large delta - thus causing default of throttling if stuff goes wrong
-;;; (15m-load . 0)
-;;; (proc . 1)
-;;; (core . 1)
-;;; (phys . 1)
-;;; (error . #t))))
-;;; (cond
-;;; ((and (list? res)
-;;; (> (length res) 2))
-;;; res)
-;;; ((eq? res #f) default) ;; add messages?
-;;; ((eq? res #f) default) ;; this would be the #eof
-;;; (else default))))
-;;;
-;;; (define (get-normalized-cpu-load-raw)
-;;; (let* ((actual-host (get-host-name))) ;; #f is localhost
-;;; (let ((data (append
-;;; (with-input-from-file "/proc/loadavg" read-lines)
-;;; (with-input-from-file "/proc/cpuinfo" read-lines)
-;;; (list "end")))
-;;; (load-rx (regexp "^([\\d\\.]+)\\s+([\\d\\.]+)\\s+([\\d\\.]+)\\s+.*$"))
-;;; (proc-rx (regexp "^processor\\s+:\\s+(\\d+)\\s*$"))
-;;; (core-rx (regexp "^core id\\s+:\\s+(\\d+)\\s*$"))
-;;; (phys-rx (regexp "^physical id\\s+:\\s+(\\d+)\\s*$"))
-;;; (max-num (lambda (p n)(max (string->number p) n))))
-;;; ;; (print "data=" data)
-;;; (if (null? data) ;; something went wrong
-;;; #f
-;;; (let loop ((hed (car data))
-;;; (tal (cdr data))
-;;; (loads #f)
-;;; (proc-num 0) ;; processor includes threads
-;;; (phys-num 0) ;; physical chip on motherboard
-;;; (core-num 0)) ;; core
-;;; ;; (print hed ", " loads ", " proc-num ", " phys-num ", " core-num)
-;;; (if (null? tal) ;; have all our data, calculate normalized load and return result
-;;; (let* ((act-proc (+ proc-num 1))
-;;; (act-phys (+ phys-num 1))
-;;; (act-core (+ core-num 1))
-;;; (adj-proc-load (/ (car loads) act-proc))
-;;; (adj-core-load (/ (car loads) act-core))
-;;; (result
-;;; (append (list (cons 'adj-proc-load adj-proc-load)
-;;; (cons 'adj-core-load adj-core-load))
-;;; (list (cons '1m-load (car loads))
-;;; (cons '5m-load (cadr loads))
-;;; (cons '15m-load (caddr loads)))
-;;; (list (cons 'proc act-proc)
-;;; (cons 'core act-core)
-;;; (cons 'phys act-phys)))))
-;;; result)
-;;; (regex-case
-;;; hed
-;;; (load-rx ( x l1 l5 l15 ) (loop (car tal)(cdr tal)(map string->number (list l1 l5 l15)) proc-num phys-num core-num))
-;;; (proc-rx ( x p ) (loop (car tal)(cdr tal) loads (max-num p proc-num) phys-num core-num))
-;;; (phys-rx ( x p ) (loop (car tal)(cdr tal) loads proc-num (max-num p phys-num) core-num))
-;;; (core-rx ( x c ) (loop (car tal)(cdr tal) loads proc-num phys-num (max-num c core-num)))
-;;; (else
-;;; (begin
-;;; ;; (print "NO MATCH: " hed)
-;;; (loop (car tal)(cdr tal) loads proc-num phys-num core-num))))))))))
-;;;
-;;; (define (get-host-stats acfg)
-;;; (let ((stats-hash (area-stats acfg)))
-;;; ;; use this opportunity to remove references to dbfiles which have not been accessed in a while
-;;; (for-each
-;;; (lambda (dbname)
-;;; (let* ((stats (hash-table-ref stats-hash dbname))
-;;; (last-access (stat-when stats)))
-;;; (if (and (> last-access 0) ;; if zero then there has been no access
-;;; (> (- (current-seconds) last-access) 10)) ;; not used in ten seconds
-;;; (begin
-;;; (print "Removing " dbname " from stats list")
-;;; (hash-table-delete! stats-hash dbname) ;; remove from stats hash
-;;; (stat-dbs-set! stats (hash-table-keys stats))))))
-;;; (hash-table-keys stats-hash))
-;;;
-;;; `(,(hash-table->alist (area-dbs acfg)) ;; dbname => randnum
-;;; ,(map (lambda (dbname) ;; dbname is the db name
-;;; (cons dbname (stat-when (hash-table-ref stats-hash dbname))))
-;;; (hash-table-keys stats-hash))
-;;; (cpuload . ,(get-normalized-cpu-load)))))
-;;; #;(stats . ,(map (lambda (k) ;; create an alist from the stats data
-;;; (cons k (stat->alist (hash-table-ref (area-stats acfg) k))))
-;;; (hash-table-keys (area-stats acfg))))
-;;;
-;;; #;(trace
-;;; ;; assv
-;;; ;; cdr
-;;; ;; caar
-;;; ;; ;; cdr
-;;; ;; call
-;;; ;; finalize-all-db-handles
-;;; ;; get-all-server-pkts
-;;; ;; get-normalized-cpu-load
-;;; ;; get-normalized-cpu-load-raw
-;;; ;; launch
-;;; ;; nmsg-send
-;;; ;; process-db-queries
-;;; ;; receive-message
-;;; ;; std-peer-handler
-;;; ;; update-known-servers
-;;; ;; work-queue-processor
-;;; )
-;;;
-;;; ;;======================================================================
-;;; ;; netutil
-;;; ;; move this back to ulex-netutil.scm someday?
-;;; ;;======================================================================
-;;;
-;;; ;; #include
-;;; ;; #include
-;;; ;; #include
-;;; ;; #include
-;;;
-;;; (foreign-declare "#include \"sys/types.h\"")
-;;; (foreign-declare "#include \"sys/socket.h\"")
-;;; (foreign-declare "#include \"ifaddrs.h\"")
-;;; (foreign-declare "#include \"arpa/inet.h\"")
-;;;
-;;; ;; get IP addresses from ALL interfaces
-;;; (define get-all-ips
-;;; (foreign-safe-lambda* scheme-object ()
-;;; "
-;;;
-;;; // from https://stackoverflow.com/questions/17909401/linux-c-get-default-interfaces-ip-address :
-;;;
-;;;
-;;; C_word lst = C_SCHEME_END_OF_LIST, len, str, *a;
-;;; // struct ifaddrs *ifa, *i;
-;;; // struct sockaddr *sa;
-;;;
-;;; struct ifaddrs * ifAddrStruct = NULL;
-;;; struct ifaddrs * ifa = NULL;
-;;; void * tmpAddrPtr = NULL;
-;;;
-;;; if ( getifaddrs(&ifAddrStruct) != 0)
-;;; C_return(C_SCHEME_FALSE);
-;;;
-;;; // for (i = ifa; i != NULL; i = i->ifa_next) {
-;;; for (ifa = ifAddrStruct; ifa != NULL; ifa = ifa->ifa_next) {
-;;; if (ifa->ifa_addr->sa_family==AF_INET) { // Check it is
-;;; // a valid IPv4 address
-;;; tmpAddrPtr = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
-;;; char addressBuffer[INET_ADDRSTRLEN];
-;;; inet_ntop(AF_INET, tmpAddrPtr, addressBuffer, INET_ADDRSTRLEN);
-;;; // printf(\"%s IP Address %s\\n\", ifa->ifa_name, addressBuffer);
-;;; len = strlen(addressBuffer);
-;;; a = C_alloc(C_SIZEOF_PAIR + C_SIZEOF_STRING(len));
-;;; str = C_string(&a, len, addressBuffer);
-;;; lst = C_a_pair(&a, str, lst);
-;;; }
-;;;
-;;; // else if (ifa->ifa_addr->sa_family==AF_INET6) { // Check it is
-;;; // // a valid IPv6 address
-;;; // tmpAddrPtr = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
-;;; // char addressBuffer[INET6_ADDRSTRLEN];
-;;; // inet_ntop(AF_INET6, tmpAddrPtr, addressBuffer, INET6_ADDRSTRLEN);
-;;; //// printf(\"%s IP Address %s\\n\", ifa->ifa_name, addressBuffer);
-;;; // len = strlen(addressBuffer);
-;;; // a = C_alloc(C_SIZEOF_PAIR + C_SIZEOF_STRING(len));
-;;; // str = C_string(&a, len, addressBuffer);
-;;; // lst = C_a_pair(&a, str, lst);
-;;; // }
-;;;
-;;; // else {
-;;; // printf(\" not an IPv4 address\\n\");
-;;; // }
-;;;
-;;; }
-;;;
-;;; freeifaddrs(ifa);
-;;; C_return(lst);
-;;;
-;;; "))
-;;;
-;;; ;; Change this to bias for addresses with a reasonable broadcast value?
-;;; ;;
-;;; (define (ip-pref-less? a b)
-;;; (let* ((rate (lambda (ipstr)
-;;; (regex-case ipstr
-;;; ( "^127\\." _ 0 )
-;;; ( "^(10\\.0|192\\.168\\.)\\..*" _ 1 )
-;;; ( else 2 ) ))))
-;;; (< (rate a) (rate b))))
-;;;
-;;;
-;;; (define (get-my-best-address)
-;;; (let ((all-my-addresses (get-all-ips))
-;;; ;;(all-my-addresses-old (vector->list (hostinfo-addresses (hostname->hostinfo (get-host-name)))))
-;;; )
-;;; (cond
-;;; ((null? all-my-addresses)
-;;; (get-host-name)) ;; no interfaces?
-;;; ((eq? (length all-my-addresses) 1)
-;;; (car all-my-addresses)) ;; only one to choose from, just go with it
-;;;
-;;; (else
-;;; (car (sort all-my-addresses ip-pref-less?)))
-;;; ;; (else
-;;; ;; (ip->string (car (filter (lambda (x) ;; take any but 127.
-;;; ;; (not (eq? (u8vector-ref x 0) 127)))
-;;; ;; all-my-addresses))))
-;;;
-;;; )))
-;;;
-;;; (define (get-all-ips-sorted)
-;;; (sort (get-all-ips) ip-pref-less?))
-;;;
-;;;
-
+ (map address-info-host
+ (filter (lambda (x)
+ (equal? (address-info-type x) "tcp"))
+ (address-infos (get-host-name)))))
+
+)