Megatest

Changes On Branch v1.63-tdb-dotserver-refactor
Login

Changes In Branch v1.63-tdb-dotserver-refactor Excluding Merge-Ins

This is equivalent to a diff from 2148615256 to 5cb3a069f8

2017-01-03
16:07
wip Closed-Leaf check-in: 5cb3a069f8 user: bjbarcla tags: v1.63-tdb-dotserver-refactor
14:08
wip check-in: e617679e45 user: bjbarcla tags: v1.63-tdb-dotserver-refactor
13:55
Merged in v1.63-server-fix branch to v1.63 check-in: 3e16b59518 user: mrwellan tags: v1.63
2016-12-29
15:16
fixed bug with kind-run call Closed-Leaf check-in: 2148615256 user: bjbarcla tags: v1.63-server-fix
00:14
added script manyservers.sh which will be basis for a test of server start & collision resilency check-in: 3d418034bd user: bjbarcla tags: v1.63-server-fix

Modified common.scm from [4b29489636] to [d04656dbed].

134
135
136
137
138
139
140
141

142
143
144
145
146
147
148
134
135
136
137
138
139
140

141
142
143
144
145
146
147
148







-
+








(define *run-info-cache*     (make-hash-table)) ;; run info is stable, no need to reget
(define *launch-setup-mutex* (make-mutex))     ;; need to be able to call launch:setup often so mutex it and re-call the real deal only if *toppath* not set
(define *homehost-mutex*     (make-mutex))

(defstruct remote
  (hh-dat            (common:get-homehost)) ;; homehost record ( addr . hhflag )
  (server-url        (if *toppath* (server:read-dotserver *toppath*))) ;; (server:check-if-running *toppath*) #f))
  (server-url        (if *toppath* (server:read-dotserver->server-url *toppath*))) ;; (server:check-if-running *toppath*) #f))
  (last-server-check 0)  ;; last time we checked to see if the server was alive
  (conndat           #f)
  (transport         *transport-type*)
  (server-timeout    (or (server:get-timeout) 100))) ;; default to 100 seconds

;; launching and hosts
(defstruct host

Modified http-transport.scm from [85b3cef6fd] to [e1abcb3338].

397
398
399
400
401
402
403
404

405
406

407
408
409
410
411
412
413
397
398
399
400
401
402
403

404
405

406
407
408
409
410
411
412
413







-
+

-
+







			(tasks:server-set-state! (db:delay-if-busy tdbdat) server-id "dbprep")
                        ;;(BB> "http-transport: ->dbprep")
			(thread-sleep! 0.5) ;; give some margin for queries to complete before switching from file based access to server based access
			(set! *dbstruct-db*  (db:setup)) ;;  run-id))
			(set! server-going #t)
			(tasks:server-set-state! (db:delay-if-busy tdbdat) server-id "running")
                        ;;(BB> "http-transport: ->running")
			(server:write-dotserver *toppath* (conc iface ":" port))
			(server:write-dotserver *toppath* iface port (current-process-id) 'http) ;; create file .server
                        (thread-start! *watchdog*)
                        (server:complete-attempt *toppath*))
                        (server:complete-attempt *toppath*)) ;; delete file .starting-server
		      (begin ;; gotta exit nicely
                        ;;(BB> "http-transport: ->collision")
			(tasks:server-set-state! (db:delay-if-busy tdbdat) server-id "collision")
			(http-transport:server-shutdown server-id port))))))
      
      ;; 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.
454
455
456
457
458
459
460
461







462
463
464
465
466
467
468
454
455
456
457
458
459
460

461
462
463
464
465
466
467
468
469
470
471
472
473
474







-
+
+
+
+
+
+
+







		    (current-seconds)))
	    (begin
	      (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)))
	      ;;
	      ;; Consider implementing some smarts here to re-insert the record or kill self is
	      ;; the db indicates so
	      ;;
              ;;
              ;; BB - added this because servers are hanging about, alive and well
              ;;      but in defunctdefault state in tdb and a .server file
              ;;      preventing replacement servers from starting.
              (tasks:server-set-state! (db:delay-if-busy tdbdat) server-id "running")

              ;;
	      ;; (if (tasks:server-am-i-the-server? tdb run-id)
	      ;;     (tasks:server-set-state! tdb server-id "running"))
	      ;;
	      (loop 0 server-state bad-sync-count (current-milliseconds)))
	    (http-transport:server-shutdown server-id port))))))

;; code cut out from above

Modified rmt.scm from [c70f311cf0] to [193d5930f9].

116
117
118
119
120
121
122
123

124
125
126
127
128
129
130
116
117
118
119
120
121
122

123
124
125
126
127
128
129
130







-
+







     ;;  (rmt:open-qry-close-locally cmd 0 params))

     
     ;; no server contact made and this is a write, passively start a server 
     ((and (not (remote-server-url *runremote*))
	   (not (member cmd api:read-only-queries)))
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case  5")
      (let ((serverconn (server:read-dotserver *toppath*))) ;; (server:check-if-running *toppath*))) ;; Do NOT want to run server:check-if-running - very expensive to do for every write call
      (let ((serverconn (server:read-dotserver->server-url *toppath*))) ;; (server:check-if-running *toppath*))) ;; Do NOT want to run server:check-if-running - very expensive to do for every write call
	(if serverconn
	    (remote-server-url-set! *runremote* serverconn) ;; the string can be consumed by the client setup if needed
	    (if (not (server:start-attempted? *toppath*))
		(server:kind-run *toppath*))))
      (if (cdr (remote-hh-dat *runremote*)) ;; we are on the homehost, just do the call
          (begin
            (mutex-unlock! *rmt-mutex*)

Modified server.scm from [24b58ed32b] to [055a606575].

135
136
137
138
139
140
141
142

143
144
145
146
147
148
149
135
136
137
138
139
140
141

142
143
144
145
146
147
148
149







-
+







	 (log-rotate  (make-thread common:rotate-logs  "server run, rotate logs thread")))
    ;; we want the remote server to start in *toppath* so push there
    (push-directory areapath)
    (cond
     (attempt-in-progress
      (debug:print 0 *default-log-port* "INFO: Not trying to start server because attempt is in progress: "attempt-in-progress))
     (dot-server-url
            (debug:print 0 *default-log-port* "INFO: Not trying to start server because one is already running : "dot-server-url))
      (debug:print 0 *default-log-port* "INFO: Not trying to start server because one is already running : "dot-server-url))
     (else
      (debug:print 0 *default-log-port* "INFO: Trying to start server (" cmdln ") ...")
      (thread-start! log-rotate)

      ;; host.domain.tld match host?
      (if (and target-host 
               ;; look at target host, is it host.domain.tld or ip address and does it 
206
207
208
209
210
211
212
213


214
215
216
217
218
219
220
221
222
223
224
225
226
























227
228
229
230

231
232


233
234
235
236
237
238
239

240
241

242
243
244
245
246
247

248
249
250

251
252
253
254
255
256
257
258
259
260
261
262
263
264


265
266

267
268
269
270

271
272

273
274
275
276
277
278
279
280
281
282
283

284
285
286
287
288
289
290
206
207
208
209
210
211
212

213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254

255
256

257
258
259
260
261
262
263
264

265
266

267
268
269
270
271
272

273
274
275

276
277
278
279
280
281
282
283
284
285
286
287
288


289
290
291

292
293
294
295

296
297

298
299
300
301
302
303
304
305
306
307
308

309
310
311
312
313
314
315
316







-
+
+













+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+



-
+

-
+
+






-
+

-
+





-
+


-
+












-
-
+
+

-
+



-
+

-
+










-
+







                  (file-modification-time flagfile))
               15)) ;; exists and less than 15 seconds old
       (with-input-from-file flagfile (lambda () (read-line))))
      ((file-exists? flagfile) ;; it is stale.
       (server:complete-attempt areapath)
       #f)
      (else #f)))))
    


(define (server:read-dotserver areapath)
  (let ((dotfile (conc areapath "/.server")))
    (handle-exceptions
     exn
     #f  ;; if things go wrong pretend we can't see the file
     (if (and (file-exists? dotfile)
	      (file-read-access? dotfile))
	 (with-input-from-file
	     dotfile
	   (lambda ()
	     (read-line)))
	 #f))))

(define (server:read-dotserver->server-url areapath)
  (let* ((temp (server:read-dotserver areapath))
         (tokens (if temp (string-split temp ":") '())))
    (if (eq? 4 (length tokens))
        (string-join (list-ref tokens 0) ":" (list-ref tokens 1))
        #f)))

(define (server:read-dotserver->pid areapath)
  (let* ((temp (server:read-dotserver areapath))
         (tokens (if temp (string-split temp ":") '())))
    (if (eq? 4 (length tokens))
        (list-ref tokens 2)
        #f)))

(define (server:read-dotserver->transport areapath)
  (let* ((temp (server:read-dotserver areapath))
         (tokens (if temp (string-split temp ":") '())))
    (if (eq? 4 (length tokens))
        (string->symbol (list-ref tokens 3))
        #f)))

(define (server:running-or-starting? areapath) ;; Note: may be unreiable on non-homehost due to NFS lag
  (or (server:read-dotserver areapath) (server:start-attempted? areapath)))

;; write a .server file in *toppath* with hostport
;; return #t on success, #f otherwise
;;
(define (server:write-dotserver areapath hostport)
(define (server:write-dotserver areapath host port pid transport)
  (let ((lock-file   (conc areapath "/.server.lock"))
	(server-file (conc areapath "/.server")))
	(server-file (conc areapath "/.server"))
        (payload (conc host ":" port ":" pid ":" transport)))
    (if (common:simple-file-lock lock-file)
	(let ((res (handle-exceptions
		    exn
		    #f ;; failed for some reason, for the moment simply return #f
		    (with-output-to-file server-file
		      (lambda ()
			(print hostport)))
			(print payload)))
		    #t)))
	  (debug:print-info 0 *default-log-port* "server file " server-file " for " hostport " created")
	  (debug:print-info 0 *default-log-port* "server file " server-file " for " payload " created")
	  (common:simple-file-release-lock lock-file)
	  res)
	#f)))

(define (server:remove-dotserver-file areapath hostport)
  (let ((dotserver   (server:read-dotserver areapath))
  (let ((serverurl   (server:read-dotserver->server-url areapath))
	(server-file (conc areapath "/.server"))
	(lock-file   (conc areapath "/.server.lock")))
    (if (and dotserver (string-match (conc ".*:" hostport "$") dotserver)) ;; port matches, good enough info to decide to remove the file
    (if (and serverurl (string-match (conc ".*:" hostport "$") serverurl)) ;; port matches, good enough info to decide to remove the file
	(if (common:simple-file-lock lock-file)
	    (begin
	      (handle-exceptions
	       exn
	       #f
	       (delete-file* server-file))
	      (debug:print-info 0 *default-log-port* "server file " server-file " for " hostport " removed")
	      (common:simple-file-release-lock lock-file))))))

;; no longer care if multiple servers are started by accident. older servers will drop off in time.
;;
(define (server:check-if-running areapath)
  (let* ((dotserver (server:read-dotserver areapath))) ;; tdbdat (tasks:open-db)))
    (if dotserver
  (let* ((serverurl (server:read-dotserver->server-url areapath))) ;; tdbdat (tasks:open-db)))
    (if serverurl
	(let* ((res (case *transport-type*
		      ((http)(server:ping-server dotserver))
		      ((http)(server:ping-server serverurl))
		      ;; ((nmsg)(nmsg-transport:ping (tasks:hostinfo-get-interface server)
		      )))
	  (if res
	      dotserver
	      serverurl
	      (begin
                (server:remove-dotserver-file areapath ".*") ;; remove stale dotserver
                (server:remove-dotserver-file areapath ".*") ;; remove stale dotserver file
                #f)))
	#f)))

;; called in megatest.scm, host-port is string hostname:port
;;
;; NOTE: This is NOT called directly from clients as not all transports support a client running
;;       in the same process as the server.
;;
(define (server:ping host-port-in #!key (do-exit #f))
  (let ((host:port (if (not host-port-in) ;; use read-dotserver to find
		       (server:read-dotserver *toppath*)
		       (server:read-dotserver->server-url *toppath*)
		       (if (number? host-port-in) ;; we were handed a server-id
			   (let ((srec (tasks:get-server-by-id (db:delay-if-busy (tasks:open-db)) host-port-in)))
			     ;; (print "srec: " srec " host-port-in: " host-port-in)
			     (if srec
				 (conc (vector-ref srec 3) ":" (vector-ref srec 4))
				 (conc "no such server-id " host-port-in)))
			   host-port-in))))

Modified tasks.scm from [a0c6ff1ee2] to [65c2fe0cbf].

328
329
330
331
332
333
334




335
336
337
338
339
340
341
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345







+
+
+
+







     (conc "SELECT " selstr " FROM servers WHERE state in ('available','running','dbprep') ORDER BY start_time DESC;")
     )
    (vector header res)))

(define (tasks:get-server mdb run-id #!key (retries 10))
  (let ((res  #f)
	(best #f))

    (set! res (vector id interface port pubport transport pid hostname)))

    
    (handle-exceptions
     exn
     (begin
       (print-call-chain (current-error-port))
       (debug:print 0 *default-log-port* "WARNING: tasks:get-server db access error.")
       (debug:print 0 *default-log-port* " message: " ((condition-property-accessor 'exn 'message) exn))
       (debug:print 0 *default-log-port* " for run " run-id)
352
353
354
355
356
357
358
359

360
361
362
363
364
365
366
367
368

369
370
371
372
373
374
375
376
377

378
379
380
381
382
383
384
356
357
358
359
360
361
362

363
364








365









366
367
368
369
370
371
372
373







-
+

-
-
-
-
-
-
-
-
+
-
-
-
-
-
-
-
-
-
+







      mdb
      ;; removed:
      ;; strftime('%s','now')-heartbeat < 10 AND mt_version = ?
      "SELECT id,interface,port,pubport,transport,pid,hostname FROM servers
          WHERE run_id=? AND state='running'
          ORDER BY start_time DESC LIMIT 1;" run-id) ;; (common:version-signature) run-id)
     res)))

   
(define (tasks:server-running-or-starting? mdb run-id)
  (let ((res #f))
    (sqlite3:for-each-row
     (lambda (id)
       (set! res id))
     mdb ;; NEEDS dbprep ADDED
     "SELECT id FROM servers WHERE run_id=? AND (state = 'running' OR (state = 'dbprep' AND  (strftime('%s','now') - start_time) < 60));" run-id)
    res))

  (server:running-or-starting? *toppath*))
(define (tasks:server-running? mdb run-id)
  (let ((res #f))
    (sqlite3:for-each-row
     (lambda (id)
       (set! res id))
     mdb ;; NEEDS dbprep ADDED
     "SELECT id FROM servers WHERE run_id=? AND state = 'running';" run-id)
    res))

  
(define (tasks:need-server run-id)
  (equal? (configf:lookup *configdat* "server" "required") "yes"))

;; 	(maxqry (cdr (rmt:get-max-query-average run-id)))
;; 	(threshold   (string->number (or (configf:lookup *configdat* "server" "server-query-threshold") "10"))))
;;     (cond
;;      (forced