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Comment:Refactor http transport
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SHA1: b662cb0a5135aec5ba17091dd11b08efda616cea
User & Date: matt on 2013-05-07 23:06:19
Other Links: branch diff | manifest | tags
Context
2013-05-08
00:34
Added timeout on no server. Auto starts a server on timeout Closed-Leaf check-in: bf5639be89 user: matt tags: refactor-http-transport
2013-05-07
23:06
Refactor http transport check-in: b662cb0a51 user: matt tags: refactor-http-transport
2013-05-06
15:37
Bumped version to v1.5422 check-in: 1037acdf73 user: mrwellan tags: v1.54, v1.5422
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Modified client.scm from [6a286c8420] to [0cd46ef301].

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(require-extension (srfi 18) extras tcp s11n)

(use sqlite3 srfi-1 posix regex regex-case srfi-69 hostinfo md5 message-digest)
;; (use zmq)

(import (prefix sqlite3 sqlite3:))

(use spiffy uri-common intarweb http-client spiffy-request-vars)

(declare (unit client))

(declare (uses common))
(declare (uses db))
(declare (uses tasks)) ;; tasks are where stuff is maintained about what is running.









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(require-extension (srfi 18) extras tcp s11n)

(use sqlite3 srfi-1 posix regex regex-case srfi-69 hostinfo md5 message-digest)
;; (use zmq)

(import (prefix sqlite3 sqlite3:))

(use spiffy uri-common intarweb http-client spiffy-request-vars uri-common intarweb)

(declare (unit client))

(declare (uses common))
(declare (uses db))
(declare (uses tasks)) ;; tasks are where stuff is maintained about what is running.
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Modified http-transport.scm from [fe6673ff15] to [9d03c1c19f].

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;;  PURPOSE.

(require-extension (srfi 18) extras tcp s11n)

(use sqlite3 srfi-1 posix regex regex-case srfi-69 hostinfo md5 message-digest)
(import (prefix sqlite3 sqlite3:))

(use spiffy uri-common intarweb http-client spiffy-request-vars)

;; Configurations for server
(tcp-buffer-size 2048)
(max-connections 2048) 

(declare (unit http-transport))









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;;  PURPOSE.

(require-extension (srfi 18) extras tcp s11n)

(use sqlite3 srfi-1 posix regex regex-case srfi-69 hostinfo md5 message-digest)
(import (prefix sqlite3 sqlite3:))

(use spiffy uri-common intarweb http-client spiffy-request-vars  uri-common intarweb)

;; Configurations for server
(tcp-buffer-size 2048)
(max-connections 2048) 

(declare (unit http-transport))
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	 (print "ERROR: Tried and tried but could not start the server")))
   ;; any error in following steps will result in a retry
   (set! *runremote* (list ipaddrstr portnum))
   ;; (open-run-close tasks:remove-server-records tasks:open-db)
   (open-run-close tasks:server-register 
		   tasks:open-db 
		   (current-process-id)
		   ipaddrstr portnum 0 'live 'http)
   (print "INFO: Trying to start server on " ipaddrstr ":" portnum)
   ;; This starts the spiffy server
   ;; NEED WAY TO SET IP TO #f TO BIND ALL
   (start-server bind-address: ipaddrstr port: portnum)
   (open-run-close tasks:server-delete tasks:open-db ipaddrstr portnum)
   (print "INFO: server has been stopped")))

;;======================================================================
;; S E R V E R   U T I L I T I E S 
;;======================================================================

;;======================================================================
;; C L I E N T S
;;======================================================================

;; <html>
;; <head></head>
;; <body>1 Hello, world! Goodbye Dolly</body></html>
;; Send msg to serverdat and receive result
(define (http-transport:client-send-receive serverdat msg)
  (let* ((url        (http-transport:make-server-url serverdat))
	 (fullurl    (conc url "/ctrl")) ;; (conc url "/?dat=" msg)))
	 (numretries 0))     

    (handle-exceptions
     exn



     (if (< numretries 200)
	 (http-transport:client-send-receive serverdat msg))
     (begin
       (debug:print-info 11 "fullurl=" fullurl "\n")
       ;; set up the http-client here
       (max-retry-attempts 100)

       (retry-request? (lambda (request)
			 (thread-sleep! (/ (if (> numretries 100) 100 numretries) 10))
			 (set! numretries (+ numretries 1))
			 #t))
       ;; send the data and get the response
       ;; extract the needed info from the http data and 
       ;; process and return it.

       (let* ((res   (with-input-from-request fullurl 
					      ;; #f
					      ;; msg 
					      (list (cons 'dat msg)) 
					      read-string)))



	 (debug:print-info 11 "got res=" res)
	 (let ((match (string-search (regexp "<body>(.*)<.body>") res)))
	   (debug:print-info 11 "match=" match)
	   (let ((final (cadr match)))
	     (debug:print-info 11 "final=" final)
	     final)))))))

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

	 (serverdat   (list iface port)))
    (set! login-res (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 0 "Failed to login or connect to " iface ":" port)

	  (set! *runremote* #f)
	  (set! *transport-type* 'fs)
	  #f))))


;; run http-transport:keep-running in a parallel thread to monitor that the db is being 
;; used and to shutdown after sometime if it is not.
;;
(define (http-transport:keep-running)
  ;; if none running or if > 20 seconds since 
  ;; server last used then start shutdown
  ;; This thread waits for the server to come alive
  (let* ((server-info (let loop ()
                        (let ((sdat #f))
                          (mutex-lock! *heartbeat-mutex*)
                          (set! sdat *runremote*)
                          (mutex-unlock! *heartbeat-mutex*)
                          (if sdat sdat

                              (begin
                                (sleep 4)
                                (loop))))))
         (iface       (car server-info))
         (port        (cadr server-info))
         (last-access 0)
	 (tdb         (tasks:open-db))








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	 (print "ERROR: Tried and tried but could not start the server")))
   ;; any error in following steps will result in a retry
   (set! *runremote* (list ipaddrstr portnum))
   ;; (open-run-close tasks:remove-server-records tasks:open-db)
   (open-run-close tasks:server-register 
		   tasks:open-db 
		   (current-process-id)
		   ipaddrstr portnum 0 'startup 'http)
   (debug:print 1 "INFO: Trying to start server on " ipaddrstr ":" portnum)
   ;; This starts the spiffy server
   ;; NEED WAY TO SET IP TO #f TO BIND ALL
   (start-server bind-address: ipaddrstr port: portnum)
   (open-run-close tasks:server-delete tasks:open-db ipaddrstr portnum)
   (debug:print 1 "INFO: server has been stopped")))

;;======================================================================
;; S E R V E R   U T I L I T I E S 
;;======================================================================

;;======================================================================
;; C L I E N T S
;;======================================================================

;; <html>
;; <head></head>
;; <body>1 Hello, world! Goodbye Dolly</body></html>
;; Send msg to serverdat and receive result
(define (http-transport:client-send-receive serverdat msg)
  (let* (;; (url        (http-transport:make-server-url serverdat))
	 (fullurl    (caddr serverdat)) ;; (conc url "/ctrl")) ;; (conc url "/?dat=" msg)))
	 (numretries 10)
	 (res        #f))
    (handle-exceptions
     exn
     (begin
       (print "ERROR IN http-transport:client-send-receive " ((condition-property-accessor 'exn 'message) exn))
       (thread-sleep! 2)
       (if (> numretries 0)
	   (http-transport:client-send-receive serverdat msg)))
     (begin
       (debug:print-info 11 "fullurl=" fullurl "\n")
       ;; set up the http-client here
       (max-retry-attempts 5)
       ;; consider all requests indempotent
       (retry-request? (lambda (request)
			 #t))   ;;  		 (thread-sleep! (/ (if (> numretries 100) 100 numretries) 10))
       (set! numretries (- numretries 1))
       ;;  		 #t))
       ;; send the data and get the response
       ;; extract the needed info from the http data and 
       ;; process and return it.
       (let* ((send-recieve (lambda ()
			      (set! res (with-input-from-request 
					 fullurl 

					 (list (cons 'dat msg)) 
					 read-string))))
	      (th1 (make-thread send-recieve "with-input-from-request")))
	 (thread-start! th1)
	 (thread-join! th1)
	 (debug:print-info 11 "got res=" res)
	 (let ((match (string-search (regexp "<body>(.*)<.body>") res)))
	   (debug:print-info 11 "match=" match)
	   (let ((final (cadr match)))
	     (debug:print-info 11 "final=" final)
	     final)))))))

(define (http-transport:client-connect iface port)
  (let* ((login-res   #f)
	 (uri-dat     (make-request method: 'POST uri: (uri-reference (conc "http://" iface ":" port "/ctrl"))))
	 (serverdat   (list iface port uri-dat)))
    (set! login-res (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 0 "ERROR: Failed to login or connect to " iface ":" port)
	  (exit 1)))))
;; 	  (set! *runremote* #f)
;; 	  (set! *transport-type* 'fs)
;; 	  #f))))


;; run http-transport:keep-running in a parallel thread to monitor that the db is being 
;; used and to shutdown after sometime if it is not.
;;
(define (http-transport:keep-running)
  ;; if none running or if > 20 seconds since 
  ;; server last used then start shutdown
  ;; This thread waits for the server to come alive
  (let* ((server-info (let loop ()
                        (let ((sdat #f))
                          (mutex-lock! *heartbeat-mutex*)
                          (set! sdat *runremote*)
                          (mutex-unlock! *heartbeat-mutex*)
                          (if sdat
			      sdat
                              (begin
                                (sleep 4)
                                (loop))))))
         (iface       (car server-info))
         (port        (cadr server-info))
         (last-access 0)
	 (tdb         (tasks:open-db))
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Modified tasks.scm from [4adf87fded] to [86ea9ba13f].

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(define (tasks:open-db)
  (let* ((dbpath  (conc *toppath* "/monitor.db"))
	 (exists  (file-exists? dbpath))
	 (mdb     (sqlite3:open-database dbpath)) ;; (never-give-up-open-db dbpath))
	 (handler (make-busy-timeout 36000)))
    (sqlite3:set-busy-handler! mdb handler)
    (sqlite3:execute mdb (conc "PRAGMA synchronous = 1;"))
    (if (not exists)
	(begin
	  (sqlite3:execute mdb "CREATE TABLE IF NOT EXISTS tasks_queue (id INTEGER PRIMARY KEY,
                                action TEXT DEFAULT '',
                                owner TEXT,
                                state TEXT DEFAULT 'new',
                                target TEXT DEFAULT '',








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(define (tasks:open-db)
  (let* ((dbpath  (conc *toppath* "/monitor.db"))
	 (exists  (file-exists? dbpath))
	 (mdb     (sqlite3:open-database dbpath)) ;; (never-give-up-open-db dbpath))
	 (handler (make-busy-timeout 36000)))
    (sqlite3:set-busy-handler! mdb handler)
    (sqlite3:execute mdb (conc "PRAGMA synchronous = 0;"))
    (if (not exists)
	(begin
	  (sqlite3:execute mdb "CREATE TABLE IF NOT EXISTS tasks_queue (id INTEGER PRIMARY KEY,
                                action TEXT DEFAULT '',
                                owner TEXT,
                                state TEXT DEFAULT 'new',
                                target TEXT DEFAULT '',
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	 (debug:print 0 "ERROR: tasks:server-get-server-id needs (hostname and pid) OR (iface and port) OR (hostname and port)")
	 "SELECT id FROM servers WHERE pid=-999;")))
     (if hostname hostname iface)(if pid pid port))
    res))

(define (tasks:server-update-heartbeat mdb server-id)
  (debug:print-info 0 "Heart beat update of server id=" 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 (iface #f)(hostname #f)(port #f)(pid #f))
  (let* ((server-id  (if server-id 
			 server-id
			 (tasks:server-get-server-id mdb hostname iface port pid)))
	 (heartbeat-delta 99e9))








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	 (debug:print 0 "ERROR: tasks:server-get-server-id needs (hostname and pid) OR (iface and port) OR (hostname and port)")
	 "SELECT id FROM servers WHERE pid=-999;")))
     (if hostname hostname iface)(if pid pid port))
    res))

(define (tasks:server-update-heartbeat mdb server-id)
  (debug:print-info 0 "Heart beat update of server id=" server-id)
  (handle-exceptions
   exn
   (begin
     (debug:print 0 "WARNING: probable timeout on monitor.db access")
     (thread-sleep! 1)
     (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 (iface #f)(hostname #f)(port #f)(pid #f))
  (let* ((server-id  (if server-id 
			 server-id
			 (tasks:server-get-server-id mdb hostname iface port pid)))
	 (heartbeat-delta 99e9))
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