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Comment:Added bit more to api:tcp-dispatch stuff
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SHA1: 3aeaa622a51066910353e4384fa3c342b61a2115
User & Date: matt on 2024-01-27 18:57:10
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Context
2024-01-29
13:01
Merged in alt-dispatch changes check-in: 530b4ded14 user: mrwellan tags: v1.80-revolution
2024-01-28
15:47
couple more functions added for experimental dispatch check-in: eba00b3478 user: matt tags: v1.80-revolution-alt-dispatch
2024-01-27
18:57
Added bit more to api:tcp-dispatch stuff check-in: 3aeaa622a5 user: matt tags: v1.80-revolution
17:30
Give useful hint in weird situation where /etc/hosts is misconfigured. Added placeholder for api:tcp-dispatch-request-make-handler do over check-in: 43be641704 user: matt tags: v1.80-revolution
Changes

Modified api.scm from [cb9119f196] to [637d41cdff].

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    (if (> (- (current-seconds) *api:last-stats-print*) 15)
	(begin
	  (rmt:print-db-stats)
	  (set! *api:last-stats-print* (current-seconds))))
    (mutex-unlock! *api-print-db-stats-mutex*)
    (thread-sleep! 5)
    (loop)))
























(define (api:tcp-dispatch-request-make-handler-new dbstruct) ;; cmd run-id params)

  ;;  put proc into in-queue
  ;;  poll out-queue for result evey 25ms
  ;;  time out with big message
  
  #f








  )



























































(define api:tcp-dispatch-request-make-handler api:tcp-dispatch-request-make-handler-old)

;; indat is (cmd run-id params meta)
;;
;; WARNING: Do not print anything in the lambda of this function as it
;;          reads/writes to current in/out port








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    (if (> (- (current-seconds) *api:last-stats-print*) 15)
	(begin
	  (rmt:print-db-stats)
	  (set! *api:last-stats-print* (current-seconds))))
    (mutex-unlock! *api-print-db-stats-mutex*)
    (thread-sleep! 5)
    (loop)))

(define *api:queue-mutex* (make-mutex))
(define *api:in-queue* '())
(define *api:out-queue* '())

(define (api:start-queue-processor)
  ;; look for work in in-queue
  ;; process it
  ;; put result in out-queue
  ;; sleep 20ms
  
  #t)

(defstuct api:queue-item
  (proc #f)
  (cmd  #f)
  (params #f)
  (start-time (current-seconds))
  (end-time   #f)
  (id   #f))

(define (api:add-queue-item proc cmd params)
  #f)

(define (api:tcp-dispatch-request-make-handler-new dbstruct) ;; cmd run-id params)

  ;;  put proc into in-queue
  ;;  poll out-queue for result evey 25ms
  ;;  time out with big message
  

  (assert *toppath* "FATAL: api:tcp-dispatch-request-make-handler called but *toppath* not set.")
  (if (not *server-signature*)
      (set! *server-signature* (tt:mk-signature *toppath*)))
  (lambda (indat)
    (let* ((result 
	    (let* ((numthreads (api:get-count-threads-alive))
		   (delay-wait (if (> numthreads 10)
				   (- numthreads 10)
				   0))
		   (normal-proc (lambda (cmd run-id params)
				  (case cmd
				    ((ping) *server-signature*)
				    (else
				     (api:dispatch-request dbstruct cmd run-id params))))))
	      (set! *api-process-request-count* numthreads)
	      (set! *db-last-access* (current-seconds))
;; 	      (if (not (eq? numthreads numthreads))
;; 	      (begin
;; 	      (api:remove-dead-or-terminated)
;; 	      (let ((threads-now (api:get-count-threads-alive)))
;; 	      (debug:print 0 *default-log-port* "WARNING: numthreads="numthreads", numthreads="numthreads", remaining="threads-now)
;; 	      (set! numthreads threads-now))))
	      (match indat
		     ((cmd run-id params meta)
		      (let* ((start-t (current-milliseconds))
			     (db-ok  (let* ((dbfname (dbmod:run-id->dbfname run-id))
					    (ok      (equal? dbfname (dbr:dbstruct-dbfname dbstruct))))
				       (case cmd
					 ((ping) #t) ;; we are fine
					 (else
					  (assert ok "FATAL: database file and run-id not aligned.")))))
			     (ttdat   *server-info*)
			     (server-state (tt-state ttdat))
			     (maxthreads   20) ;; make this a parameter?
			     (status  (cond
				       ((and (> numthreads maxthreads)
					     (> (random 100) 70)) ;; allow a 30% probability to go through so we can figure out what is going wrong in main.db server.
					'busy)
				       ;; ((> numthreads 5) 'loaded) ;; this gets transmitted to the client which calls tt:backoff-incr to slow stuff down.
				       (else 'ok)))
			     (errmsg  (case status
					((busy)   (conc "Server overloaded, "numthreads" threads in flight"))
					((loaded) (conc "Server loaded, "numthreads" threads in flight"))
					(else     #f)))
			     (result  (case status
					((busy)
					 (if (eq? cmd 'ping)
					     (normal-proc cmd run-id params)
					     ;; numthreads must be greater than 5 for busy
					     (* 0.1 (- numthreads maxthreads)) ;; was 15 - return a number for the remote to delay
					     )) ;; (- numthreads 29)) ;; call back in as many seconds
					((loaded)
					 ;; 			    (if (eq? (rmt:transport-mode) 'tcp)
					 ;; 				(thread-sleep! 0.5))
					 (normal-proc cmd run-id params))
					(else
					 (normal-proc cmd run-id params))))
			     (meta   (case cmd
				       ((ping) `((sstate . ,server-state)))
				       (else   `((wait . ,delay-wait)))))
			     (payload (list status errmsg result meta)))
			;; (cmd run-id params meta)
			(db:add-stats cmd run-id params (- (current-milliseconds) start-t))
			payload))
		     (else
		      (assert #f "FATAL: failed to deserialize indat "indat))))))
      result)))

(define api:tcp-dispatch-request-make-handler api:tcp-dispatch-request-make-handler-old)

;; indat is (cmd run-id params meta)
;;
;; WARNING: Do not print anything in the lambda of this function as it
;;          reads/writes to current in/out port