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Comment:second pass http, queue processing remaining
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Timelines: family | ancestors | descendants | both | http-transport
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SHA1: e6b987028dcb11af5e20c4da991b8001a32e6374
User & Date: matt on 2013-01-14 23:03:28
Other Links: branch diff | manifest | tags
Context
2013-01-15
17:40
incrementl changes for http transport check-in: d3db3e5ba1 user: mrwellan tags: http-transport
2013-01-14
23:03
second pass http, queue processing remaining check-in: e6b987028d user: matt tags: http-transport
22:17
first pass implemenation using http check-in: 0d7a6d510a user: matt tags: http-transport
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Modified db.scm from [887b32b0da] to [644346c603].

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			       flush
			       sync
			       set-verbosity
			       killserver))

;; not used, intended to indicate to run in calling process
(define db:run-local-queries '()) ;; rollup-tests-pass-fail))


























;; The queue is a list of vectors where the zeroth slot indicates the type of query to
;; apply and the second slot is the time of the query and the third entry is a list of 
;; values to be applied
;;
(define (db:process-queue db pubsock indata)
  (let* ((data       (sort indata (lambda (a b)








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			       flush
			       sync
			       set-verbosity
			       killserver))

;; not used, intended to indicate to run in calling process
(define db:run-local-queries '()) ;; rollup-tests-pass-fail))








UPDATE DB:PROCESS_QUEUE@@@@

















;; The queue is a list of vectors where the zeroth slot indicates the type of query to
;; apply and the second slot is the time of the query and the third entry is a list of 
;; values to be applied
;;
(define (db:process-queue db pubsock indata)
  (let* ((data       (sort indata (lambda (a b)
︙︙

Modified server.scm from [f532ca81a3] to [a4326a1d4d].

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					   (string-intersperse (map number->string (u8vector->list (hostname->ip hostname))) ".")
					   #f)))
			    (if ipstr ipstr hostname)))
	 (start-port    (if (args:get-arg "-port")
			    (string->number (args:get-arg "-port"))
			    (+ 5000 (random 1001)))))
    (set! *cache-on* #t)
    (server:try-start-server ipaddrstr portnum)))

















;; This is recursively run by server:run until sucessful
;;
(define (server:try-start-server ipaddrstr portnum)
  (handle-exceptions
   exn
   (begin
     (print-error-message exn)
     (if (< portnum 9000)
	 (begin 
	   (print "WARNING: failed to start on portnum: " portnum ", trying next port")
	   (sleep 1)
	   (server:try-start-server ipaddrstr (+ portnum 1)))
	 (print "ERROR: Tried and tried but could not start the server")))
   (print "INFO: Trying to start server on portnum: " portnum)






   (awful-start hello-world ip-address: ipaddrstr port: portnum)))

(define (server:mk-signature)
  (message-digest-string (md5-primitive) 
			 (with-output-to-string
			   (lambda ()
			     (write (list (current-directory)
					  (argv)))))))








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					   (string-intersperse (map number->string (u8vector->list (hostname->ip hostname))) ".")
					   #f)))
			    (if ipstr ipstr hostname)))
	 (start-port    (if (args:get-arg "-port")
			    (string->number (args:get-arg "-port"))
			    (+ 5000 (random 1001)))))
    (set! *cache-on* #t)
    (server:try-start-server ipaddrstr start-port)))


(define (server:main-loop)
  (define-page (main-page-path)
    (lambda ()
      (with-request-variables (dat)
	(let* ((packet (db:string->obj dat))
	       (qtype  (cdb:packet-get-qtype packet)))
	  (debug:print-info 12 "server=> received packet=" packet)
	  (if (not (member qtype '(sync ping)))
	      (begin
		(mutex-lock! *heartbeat-mutex*)
		(set! *last-db-access* (current-seconds))
		(mutex-unlock! *heartbeat-mutex*)))
	  (open-run-close db:process-queue #f pub-socket (cons packet queue-lst)))))))


;; This is recursively run by server:run until sucessful
;;
(define (server:try-start-server ipaddrstr portnum)
  (handle-exceptions
   exn
   (begin
     (print-error-message exn)
     (if (< portnum 9000)
	 (begin 
	   (print "WARNING: failed to start on portnum: " portnum ", trying next port")
	   (sleep 1)
	   (server:try-start-server ipaddrstr (+ portnum 1)))
	 (print "ERROR: Tried and tried but could not start the server")))
   (print "INFO: Trying to start server on portnum: " portnum)
   
   (set! *runremote* (list ipaddrstr portnum))
   (open-run-close tasks:server-register 
		   tasks:open-db 
		   (current-process-id)
		   ipaddrstr portnum 0 'live)
   (awful-start server:main-loop ip-address: ipaddrstr port: portnum)))

(define (server:mk-signature)
  (message-digest-string (md5-primitive) 
			 (with-output-to-string
			   (lambda ()
			     (write (list (current-directory)
					  (argv)))))))
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;;======================================================================

(define (server:get-client-signature)
  (if *my-client-signature* *my-client-signature*
      (let ((sig (server:mk-signature)))
	(set! *my-client-signature* sig)
	*my-client-signature*)))

;; <html>
;; <head></head>
;; <body>1 Hello, world! Goodbye Dolly</body></html>
;; Send msg to serverdat and receive result
(define (server:client-send-receive serverdat msg)
  (let* ((res (with-input-from-request (conc serverdat "/?dat=" msg) #f read-string))
	 (match (string-search (regexp "<body>(.*)<.body>") (caddr (string-split res "\n")))))
    (cadr match)))

(define (server:client-login serverdat)
  (cdb:login serverdat *toppath* (server:get-client-signature)))

;; Not currently used! But, I think it *should* be used!!!
(define (server:client-logout zmq-socket)
  (let ((ok (and (socket? zmq-socket)
		 (cdb:logout zmq-socket *toppath* (server:get-client-signature)))))
    ;; (close-socket zmq-socket)
    ok))

(define (server:client-connect iface port)
  (let* ((login-res   #f))

    (set! login-res (server:client-login serverdat))
    (if (and (not (null? login-res))
	     (car login-res))
	(begin
	  (debug:print-info 2 "Logged in and connected to " iface ":" pullport "/" pubport ".")
	  (set! *runremote* serverdat)
	  serverdat)
	(begin
	  (debug:print-info 2 "Failed to login or connect to " conurl)
	  (set! *runremote* #f)
	  #f))))

;; Do all the connection work, start a server if not already running
(define (server:client-setup #!key (numtries 50))
  (if (not *toppath*)
      (if (not (setup-for-run))
	  (begin
	    (debug:print 0 "ERROR: failed to find megatest.config, exiting")
	    (exit))))
  (let ((hostinfo   (open-run-close tasks:get-best-server tasks:open-db)))
    (if hostinfo
	(let ((host     (list-ref hostinfo 0))
	      (iface    (list-ref hostinfo 1)))
	  (debug:print-info 2 "Setting up to connect to " hostinfo)
	  (server:client-connect iface pullport pubport)) ;; )
	(if (> numtries 0)
	    (let ((exe (car (argv)))
		  (pid #f))
	      (debug:print-info 0 "No server available, attempting to start one...")
	      ;; (set! pid (process-run exe (list "-server" "-" "-debug" (if (list? *verbosity*)
	      ;;   							  (string-intersperse *verbosity* ",")
	      ;;   							  (conc *verbosity*)))))








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;;======================================================================

(define (server:get-client-signature)
  (if *my-client-signature* *my-client-signature*
      (let ((sig (server:mk-signature)))
	(set! *my-client-signature* sig)
	*my-client-signature*)))

;; <html>
;; <head></head>
;; <body>1 Hello, world! Goodbye Dolly</body></html>
;; Send msg to serverdat and receive result
(define (server:client-send-receive serverdat msg)
  (let* ((res (with-input-from-request (conc (server:make-server-url serverdat) "/?dat=" msg) #f read-string))
	 (match (string-search (regexp "<body>(.*)<.body>") (caddr (string-split res "\n")))))
    (cadr match)))

(define (server:client-login serverdat)
  (cdb:login serverdat *toppath* (server:get-client-signature)))

;; Not currently used! But, I think it *should* be used!!!
(define (server:client-logout serverdat)
  (let ((ok (and (socket? serverdat)
		 (cdb:logout serverdat *toppath* (server:get-client-signature)))))
    ;; (close-socket serverdat)
    ok))

(define (server:client-connect iface port)
  (let* ((login-res   #f)
	 (serverdat   (list iface port)))
    (set! login-res (server:client-login serverdat))
    (if (and (not (null? login-res))
	     (car login-res))
	(begin
	  (debug:print-info 2 "Logged in and connected to " iface ":" port)
	  (set! *runremote* serverdat)
	  serverdat)
	(begin
	  (debug:print-info 2 "Failed to login or connect to " iface ":" port)
	  (set! *runremote* #f)
	  #f))))

;; Do all the connection work, start a server if not already running
(define (server:client-setup #!key (numtries 50))
  (if (not *toppath*)
      (if (not (setup-for-run))
	  (begin
	    (debug:print 0 "ERROR: failed to find megatest.config, exiting")
	    (exit))))
  (let ((hostinfo   (open-run-close tasks:get-best-server tasks:open-db)))
    (if hostinfo
	(let ((host     (list-ref hostinfo 0))
	      (iface    (list-ref hostinfo 1)))
	  (debug:print-info 2 "Setting up to connect to " hostinfo)
	  (server:client-connect iface port)) ;; )
	(if (> numtries 0)
	    (let ((exe (car (argv)))
		  (pid #f))
	      (debug:print-info 0 "No server available, attempting to start one...")
	      ;; (set! pid (process-run exe (list "-server" "-" "-debug" (if (list? *verbosity*)
	      ;;   							  (string-intersperse *verbosity* ",")
	      ;;   							  (conc *verbosity*)))))
︙︙

Modified tasks.scm from [bc19277591] to [2c690c7219].

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                                hostname TEXT,
                                username TEXT,
                               CONSTRAINT monitors_constraint UNIQUE (pid,hostname));")
	  (sqlite3:execute mdb "CREATE TABLE IF NOT EXISTS servers (id INTEGER PRIMARY KEY,
                                  pid INTEGER,
                                  interface TEXT,
                                  hostname TEXT,
                                  pullport INTEGER,
                                  pubport  INTEGER,
                                  start_time TIMESTAMP,
                                  priority INTEGER,
                                  state TEXT,
                                  mt_version TEXT,
                                  heartbeat TIMESTAMP,
                               CONSTRAINT servers_constraint UNIQUE (pid,hostname,pullport,pubport));")
	  (sqlite3:execute mdb "CREATE TABLE IF NOT EXISTS clients (id INTEGER PRIMARY KEY,
                                  server_id INTEGER,
                                  pid INTEGER,
                                  hostname TEXT,
                                  cmdline TEXT,
                                  login_time TIMESTAMP,
                                  logout_time TIMESTAMP DEFAULT -1,
                                CONSTRAINT clients_constraint UNIQUE (pid,hostname));")
                                  
	  ))
    mdb))
    
;;======================================================================
;; Server and client management
;;======================================================================

;; state: 'live, 'shutting-down, 'dead
(define (tasks:server-register mdb pid interface pullport pubport priority state)
  (sqlite3:execute 
   mdb 
   "INSERT OR REPLACE INTO servers (pid,hostname,pullport,pubport,start_time,priority,state,mt_version,heartbeat,interface)
                             VALUES(?,  ?,       ?,       ?, strftime('%s','now'), ?, ?, ?, strftime('%s','now'),?);"
   pid (get-host-name) pullport pubport priority (conc state) megatest-version interface)
  (list 
   (tasks:server-get-server-id mdb (get-host-name) pullport pid)
   interface
   pullport
   pubport))

;; NB// two servers with same pid on different hosts will be removed from the list if pid: is used!
(define (tasks:server-deregister mdb hostname #!key (pullport #f)(pid #f)(action 'markdead))
  (debug:print-info 11 "server-deregister " hostname ", pullport " pullport ", pid " pid)
  (if pid
      (case action
	((delete)(sqlite3:execute mdb "DELETE FROM servers WHERE pid=?;" pid))
	(else    (sqlite3:execute mdb "UPDATE servers SET state='dead' WHERE pid=?;" pid)))
      (if pullport
	  (case action
	    ((delete)(sqlite3:execute mdb "DELETE FROM servers WHERE  hostname=? AND pullport=?;" hostname port))
	    (else    (sqlite3:execute mdb "UPDATE servers SET state='dead' WHERE hostname=? AND pullport=?;" hostname pullport)))
	  (debug:print 0 "ERROR: tasks:server-deregister called with neither pid nor port specified"))))

(define (tasks:server-deregister-self mdb hostname)
  (tasks:server-deregister mdb hostname pid: (current-process-id)))

(define (tasks:server-get-server-id mdb hostname pullport pid)
  (let ((res #f))
    (sqlite3:for-each-row
     (lambda (id)
       (set! res id))
     mdb
     (if (and hostname  pid)
	 "SELECT id FROM servers WHERE hostname=? AND pid=?;"
	 "SELECT id FROM servers WHERE hostname=? AND pullport=?;")
     hostname (if pid pid pullport))
    res))

(define (tasks:server-update-heartbeat mdb server-id)
  (sqlite3:execute mdb "UPDATE servers SET heartbeat=strftime('%s','now') WHERE id=?;" server-id))

;; alive servers keep the heartbeat field upto date with seconds every 6 or so seconds
(define (tasks:server-alive? mdb server-id #!key (hostname #f)(pullport #f)(pid #f))
  (let* ((server-id  (if server-id 
			 server-id
			 (tasks:server-get-server-id mdb hostname pullport pid)))
	 (heartbeat-delta 99e9))
    (sqlite3:for-each-row
     (lambda (delta)
       (set! heartbeat-delta delta))
     mdb "SELECT strftime('%s','now')-heartbeat FROM servers WHERE id=?;" server-id)
    (< heartbeat-delta 10)))









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                                hostname TEXT,
                                username TEXT,
                               CONSTRAINT monitors_constraint UNIQUE (pid,hostname));")
	  (sqlite3:execute mdb "CREATE TABLE IF NOT EXISTS servers (id INTEGER PRIMARY KEY,
                                  pid INTEGER,
                                  interface TEXT,
                                  hostname TEXT,
                                  port INTEGER,

                                  start_time TIMESTAMP,
                                  priority INTEGER,
                                  state TEXT,
                                  mt_version TEXT,
                                  heartbeat TIMESTAMP,
                               CONSTRAINT servers_constraint UNIQUE (pid,hostname,port));")
	  (sqlite3:execute mdb "CREATE TABLE IF NOT EXISTS clients (id INTEGER PRIMARY KEY,
                                  server_id INTEGER,
                                  pid INTEGER,
                                  hostname TEXT,
                                  cmdline TEXT,
                                  login_time TIMESTAMP,
                                  logout_time TIMESTAMP DEFAULT -1,
                                CONSTRAINT clients_constraint UNIQUE (pid,hostname));")
                                  
	  ))
    mdb))
    
;;======================================================================
;; Server and client management
;;======================================================================

;; state: 'live, 'shutting-down, 'dead
(define (tasks:server-register mdb pid interface port priority state)
  (sqlite3:execute 
   mdb 
   "INSERT OR REPLACE INTO servers (pid,hostname,port,start_time,priority,state,mt_version,heartbeat,interface)
                             VALUES(?,  ?,       ?, strftime('%s','now'), ?, ?, ?, strftime('%s','now'),?);"
   pid (get-host-name) port priority (conc state) megatest-version interface)
  (list 
   (tasks:server-get-server-id mdb (get-host-name) port pid)
   interface
   port
   ))

;; NB// two servers with same pid on different hosts will be removed from the list if pid: is used!
(define (tasks:server-deregister mdb hostname #!key (port #f)(pid #f)(action 'markdead))
  (debug:print-info 11 "server-deregister " hostname ", port " port ", pid " pid)
  (if pid
      (case action
	((delete)(sqlite3:execute mdb "DELETE FROM servers WHERE pid=?;" pid))
	(else    (sqlite3:execute mdb "UPDATE servers SET state='dead' WHERE pid=?;" pid)))
      (if port
	  (case action
	    ((delete)(sqlite3:execute mdb "DELETE FROM servers WHERE  hostname=? AND port=?;" hostname port))
	    (else    (sqlite3:execute mdb "UPDATE servers SET state='dead' WHERE hostname=? AND port=?;" hostname port)))
	  (debug:print 0 "ERROR: tasks:server-deregister called with neither pid nor port specified"))))

(define (tasks:server-deregister-self mdb hostname)
  (tasks:server-deregister mdb hostname pid: (current-process-id)))

(define (tasks:server-get-server-id mdb hostname port pid)
  (let ((res #f))
    (sqlite3:for-each-row
     (lambda (id)
       (set! res id))
     mdb
     (if (and hostname  pid)
	 "SELECT id FROM servers WHERE hostname=? AND pid=?;"
	 "SELECT id FROM servers WHERE hostname=? AND port=?;")
     hostname (if pid pid port))
    res))

(define (tasks:server-update-heartbeat mdb server-id)
  (sqlite3:execute mdb "UPDATE servers SET heartbeat=strftime('%s','now') WHERE id=?;" server-id))

;; alive servers keep the heartbeat field upto date with seconds every 6 or so seconds
(define (tasks:server-alive? mdb server-id #!key (hostname #f)(port #f)(pid #f))
  (let* ((server-id  (if server-id 
			 server-id
			 (tasks:server-get-server-id mdb hostname port pid)))
	 (heartbeat-delta 99e9))
    (sqlite3:for-each-row
     (lambda (delta)
       (set! heartbeat-delta delta))
     mdb "SELECT strftime('%s','now')-heartbeat FROM servers WHERE id=?;" server-id)
    (< heartbeat-delta 10)))
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;; ping each server in the db and return first found that responds. 
;; remove any others. will not necessarily remove all!
(define (tasks:get-best-server mdb)
  (let ((res '())
	(best #f))
    (sqlite3:for-each-row
     (lambda (id hostname interface pullport pubport pid)
       (set! res (cons (list hostname interface pullport pubport pid) res))
       (debug:print-info 2 "Found existing server " hostname ":" pullport " registered in db"))
     mdb
     "SELECT id,hostname,interface,pullport,pubport,pid FROM servers
         WHERE strftime('%s','now')-heartbeat < 10
               AND mt_version=? ORDER BY start_time ASC LIMIT 1;" megatest-version)
    (if (null? res) #f
	(let loop ((hed (car res))
		   (tal (cdr res)))
	  ;; (print "hed=" hed ", tal=" tal)
	  (let* ((host     (list-ref hed 0))
		 (iface    (list-ref hed 1))
		 (pullport (list-ref hed 2))
		 (pubport  (list-ref hed 3))
		 (pid      (list-ref hed 4))
		 (alive    (open-run-close tasks:server-alive? tasks:open-db #f hostname: host pullport: pullport)))
	    (if alive
		(begin
		  (debug:print-info 2 "Found an existing, alive, server " host ", " pullport " and " pubport ".")
		  (list host iface pullport pubport))
		(begin
		  (debug:print-info 1 "Marking " host ":" pullport " as dead in server registry.")
		  (if pullport
		      (open-run-close tasks:server-deregister tasks:open-db host pullport: pullport)
		      (open-run-close tasks:server-deregister tasks:open-db host pid:  pid))
		  (if (null? tal)
		      #f
		      (loop (car tal)(cdr tal))))))))))

(define (tasks:mark-server hostname pullport pid state)
  (if port
      (open-run-close tasks:server-deregister tasks:open-db hostname port: port)
      (open-run-close tasks:server-deregister tasks:open-db hostname pid:  pid)))


;; NOTE: NOT PORTED TO WORK WITH pullport/pubport
(define (tasks:kill-server status hostname port pid)
  (debug:print-info 1 "Removing defunct server record for " hostname ":" port)
  (if port
      (open-run-close tasks:server-deregister tasks:open-db hostname port: port)
      (open-run-close tasks:server-deregister tasks:open-db hostname pid:  pid))
  (if status ;; #t means alive
      (begin








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;; ping each server in the db and return first found that responds. 
;; remove any others. will not necessarily remove all!
(define (tasks:get-best-server mdb)
  (let ((res '())
	(best #f))
    (sqlite3:for-each-row
     (lambda (id hostname interface port pid)
       (set! res (cons (list hostname interface port pid) res))
       (debug:print-info 2 "Found existing server " hostname ":" port " registered in db"))
     mdb
     "SELECT id,hostname,interface,port,pid FROM servers
         WHERE strftime('%s','now')-heartbeat < 10
               AND mt_version=? ORDER BY start_time ASC LIMIT 1;" megatest-version)
    (if (null? res) #f
	(let loop ((hed (car res))
		   (tal (cdr res)))
	  ;; (print "hed=" hed ", tal=" tal)
	  (let* ((host     (list-ref hed 0))
		 (iface    (list-ref hed 1))
		 (port     (list-ref hed 2))

		 (pid      (list-ref hed 4))
		 (alive    (open-run-close tasks:server-alive? tasks:open-db #f hostname: host port: port)))
	    (if alive
		(begin
		  (debug:print-info 2 "Found an existing, alive, server " host ", " port ".")
		  (list host iface port))
		(begin
		  (debug:print-info 1 "Marking " host ":" port " as dead in server registry.")
		  (if port
		      (open-run-close tasks:server-deregister tasks:open-db host port: port)
		      (open-run-close tasks:server-deregister tasks:open-db host pid:  pid))
		  (if (null? tal)
		      #f
		      (loop (car tal)(cdr tal))))))))))

(define (tasks:mark-server hostname port pid state)
  (if port
      (open-run-close tasks:server-deregister tasks:open-db hostname port: port)
      (open-run-close tasks:server-deregister tasks:open-db hostname pid:  pid)))



(define (tasks:kill-server status hostname port pid)
  (debug:print-info 1 "Removing defunct server record for " hostname ":" port)
  (if port
      (open-run-close tasks:server-deregister tasks:open-db hostname port: port)
      (open-run-close tasks:server-deregister tasks:open-db hostname pid:  pid))
  (if status ;; #t means alive
      (begin
︙︙
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		(debug:print 0 "WARNING: Can't kill frozen server on remote host " hostname))))))



(define (tasks:get-all-servers mdb)
  (let ((res '()))
    (sqlite3:for-each-row
     (lambda (id pid hostname interface pullport pubport start-time priority state mt-version last-update)
       (set! res (cons (vector id pid hostname interface pullport pubport start-time priority state mt-version last-update) res)))
     mdb
     "SELECT id,pid,hostname,interface,pullport,pubport,start_time,priority,state,mt_version,strftime('%s','now')-heartbeat AS last_update FROM servers ORDER BY start_time DESC;")
    res))
       

;;======================================================================
;; Tasks and Task monitors
;;======================================================================









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		(debug:print 0 "WARNING: Can't kill frozen server on remote host " hostname))))))



(define (tasks:get-all-servers mdb)
  (let ((res '()))
    (sqlite3:for-each-row
     (lambda (id pid hostname interface port start-time priority state mt-version last-update)
       (set! res (cons (vector id pid hostname interface port start-time priority state mt-version last-update) res)))
     mdb
     "SELECT id,pid,hostname,interface,port,start_time,priority,state,mt_version,strftime('%s','now')-heartbeat AS last_update FROM servers ORDER BY start_time DESC;")
    res))
       

;;======================================================================
;; Tasks and Task monitors
;;======================================================================
︙︙

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