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;;======================================================================
;; Copyright 2006-2012, Matthew Welland.
;;
;; This program is made available under the GNU GPL version 2.0 or
;; greater. See the accompanying file COPYING for details.
;;
;; This program is distributed WITHOUT ANY WARRANTY; without even the
;; implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
;; PURPOSE.
;;======================================================================
(use srfi-1 posix regex-case base64 format dot-locking csv-xml z3 sql-de-lite hostinfo md5 message-digest typed-records directory-utils)
(require-extension regex posix)
(require-extension (srfi 18) extras tcp rpc)
(import (prefix sqlite3 sqlite3:))
(import (prefix base64 base64:))
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;;======================================================================
;; Copyright 2006-2012, Matthew Welland.
;;
;; This program is made available under the GNU GPL version 2.0 or
;; greater. See the accompanying file COPYING for details.
;;
;; This program is distributed WITHOUT ANY WARRANTY; without even the
;; implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
;; PURPOSE.
;;======================================================================
(use srfi-1 posix regex-case base64 format dot-locking csv-xml z3 sql-de-lite hostinfo md5 message-digest typed-records directory-utils stack)
(require-extension regex posix)
(require-extension (srfi 18) extras tcp rpc)
(import (prefix sqlite3 sqlite3:))
(import (prefix base64 base64:))
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;; db stats
(define *db-stats* (make-hash-table)) ;; hash of vectors < count duration-total >
(define *db-stats-mutex* (make-mutex))
;; db access
(define *db-last-access* (current-seconds)) ;; last db access, used in server
(define *db-write-access* #t)
;; db sync
(define *db-last-write* 0) ;; used to record last touch of db
(define *db-multi-sync-mutex* (make-mutex)) ;; protect access to *db-sync-in-progress*, *db-last-sync* and *db-last-write*
;; task db
(define *task-db* #f) ;; (vector db path-to-db)
(define *db-access-allowed* #t) ;; flag to allow access
(define *db-access-mutex* (make-mutex))
(define *db-cache-path* #f)
;; SERVER
(define *my-client-signature* #f)
(define *transport-type* 'http) ;; override with [server] transport http|rpc|nmsg
(define *runremote* #f) ;; if set up for server communication this will hold <host port>
(define *max-cache-size* 0)
(define *logged-in-clients* (make-hash-table))
(define *server-id* #f)
(define *server-info* #f)
(define *time-to-exit* #f)
(define *server-run* #t)
(define *run-id* #f)
(define *server-kind-run* (make-hash-table))
(define *home-host* #f)
(define *total-non-write-delay* 0)
(define *heartbeat-mutex* (make-mutex))
;; client
(define *rmt-mutex* (make-mutex)) ;; remote access calls mutex
;; RPC transport
(define *rpc:listener* #f)
;; KEY info
(define *target* (make-hash-table)) ;; cache the target here; target is keyval1/keyval2/.../keyvalN
(define *keys* (make-hash-table)) ;; cache the keys here
(define *keyvals* (make-hash-table))
(define *toptest-paths* (make-hash-table)) ;; cache toptest path settings here
(define *test-paths* (make-hash-table)) ;; cache test-id to test run paths here
(define *test-ids* (make-hash-table)) ;; cache run-id, testname, and item-path => test-id
(define *test-info* (make-hash-table)) ;; cache the test info records, update the state, status, run_duration etc. from testdat.db
(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))
;; launching and hosts
(defstruct host
(reachable #f)
(last-update 0)
(last-used 0)
(last-cpuload 1))
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;; db stats
(define *db-stats* (make-hash-table)) ;; hash of vectors < count duration-total >
(define *db-stats-mutex* (make-mutex))
;; db access
(define *db-last-access* (current-seconds)) ;; last db access, used in server
(define *db-write-access* #t)
;; db sync
(define *db-last-sync* 0) ;; last time the sync to megatest.db happened
(define *db-sync-in-progress* #f) ;; if there is a sync in progress do not try to start another
(define *db-multi-sync-mutex* (make-mutex)) ;; protect access to *db-sync-in-progress*, *db-last-sync*
;; task db
(define *task-db* #f) ;; (vector db path-to-db)
(define *db-access-allowed* #t) ;; flag to allow access
(define *db-access-mutex* (make-mutex))
(define *db-transaction-mutex* (make-mutex))
(define *db-cache-path* #f)
(define *db-with-db-mutex* (make-mutex))
(define *db-api-call-time* (make-hash-table)) ;; hash of command => (list of times)
;; SERVER
(define *my-client-signature* #f)
(define *transport-type* 'http) ;; override with [server] transport http|rpc|nmsg
(define *runremote* #f) ;; if set up for server communication this will hold <host port>
(define *max-cache-size* 0)
(define *logged-in-clients* (make-hash-table))
(define *server-id* #f)
(define *server-info* #f)
(define *time-to-exit* #f)
(define *server-run* #t)
(define *run-id* #f)
(define *server-kind-run* (make-hash-table))
(define *home-host* #f)
(define *total-non-write-delay* 0)
(define *heartbeat-mutex* (make-mutex))
(define *api-process-request-count* 0)
(define *max-api-process-requests* 0)
;; client
(define *rmt-mutex* (make-mutex)) ;; remote access calls mutex
;; RPC transport
(define *rpc:listener* #f)
;; KEY info
(define *target* (make-hash-table)) ;; cache the target here; target is keyval1/keyval2/.../keyvalN
(define *keys* (make-hash-table)) ;; cache the keys here
(define *keyvals* (make-hash-table))
(define *toptest-paths* (make-hash-table)) ;; cache toptest path settings here
(define *test-paths* (make-hash-table)) ;; cache test-id to test run paths here
(define *test-ids* (make-hash-table)) ;; cache run-id, testname, and item-path => test-id
(define *test-info* (make-hash-table)) ;; cache the test info records, update the state, status, run_duration etc. from testdat.db
(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->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
(reachable #f)
(last-update 0)
(last-used 0)
(last-cpuload 1))
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(message-digest-string (md5-primitive) *toppath*))
;;======================================================================
;; E X I T H A N D L I N G
;;======================================================================
(define (common:run-sync?)
(let ((ohh (common:on-homehost?))
(srv (args:get-arg "-server")))
;; (debug:print-info 0 *default-log-port* "common:run-sync? ohh=" ohh ", srv=" srv)
(and (common:on-homehost?)
(args:get-arg "-server"))))
;;;; run-ids
;; if #f use *db-local-sync* : or 'local-sync-flags
;; if #t use timestamps : or 'timestamps
(define (common:sync-to-megatest.db dbstruct)
(let ((start-time (current-seconds))
(res (db:multi-db-sync dbstruct 'new2old)))
(let ((sync-time (- (current-seconds) start-time)))
(debug:print-info 3 *default-log-port* "Sync of newdb to olddb completed in " sync-time " seconds")
(if (common:low-noise-print 30 "sync new to old")
(debug:print-info 0 *default-log-port* "Sync of newdb to olddb completed in " sync-time " seconds")))
res))
;; currently the primary job of the watchdog is to run the sync back to megatest.db from the db in /tmp
;; if we are on the homehost and we are a server (by definition we are on the homehost if we are a server)
;;
(define (common:watchdog)
(thread-sleep! 0.05) ;; delay for startup
(let ((legacy-sync (common:run-sync?))
(debug-mode (debug:debug-mode 1))
(last-time (current-seconds)))
(debug:print-info 0 *default-log-port* "watchdog starting. legacy-sync is " legacy-sync)
(if legacy-sync
(let ((dbstruct (db:setup)))
(debug:print-info 0 *default-log-port* "Server running, periodic sync started.")
(let loop ()
;; sync for filesystem local db writes
;;
(mutex-lock! *db-multi-sync-mutex*)
(let* ((need-sync (>= *db-last-write* *db-last-sync*)) ;; no sync since last write
(sync-in-progress *db-sync-in-progress*)
(should-sync (> (- (current-seconds) *db-last-sync*) 5)) ;; sync every five seconds minimum
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(message-digest-string (md5-primitive) *toppath*))
;;======================================================================
;; E X I T H A N D L I N G
;;======================================================================
(define (common:run-sync?)
(and (common:on-homehost?)
(args:get-arg "-server")))
;; (let ((ohh (common:on-homehost?))
;; (srv (args:get-arg "-server")))
;; (and ohh srv)))
;; (debug:print-info 0 *default-log-port* "common:run-sync? ohh=" ohh ", srv=" srv)
;;;; run-ids
;; if #f use *db-local-sync* : or 'local-sync-flags
;; if #t use timestamps : or 'timestamps
(define (common:sync-to-megatest.db dbstruct)
(let ((start-time (current-seconds))
(res (db:multi-db-sync dbstruct 'new2old)))
(let ((sync-time (- (current-seconds) start-time)))
(debug:print-info 3 *default-log-port* "Sync of newdb to olddb completed in " sync-time " seconds pid="(current-process-id))
(if (common:low-noise-print 30 "sync new to old")
(debug:print-info 0 *default-log-port* "Sync of newdb to olddb completed in " sync-time " seconds pid="(current-process-id))))
res))
(define *wdnum* 0)
(define *wdnum*mutex (make-mutex))
;; currently the primary job of the watchdog is to run the sync back to megatest.db from the db in /tmp
;; if we are on the homehost and we are a server (by definition we are on the homehost if we are a server)
;;
(define (common:watchdog)
(thread-sleep! 0.05) ;; delay for startup
(let ((legacy-sync (common:run-sync?))
(debug-mode (debug:debug-mode 1))
(last-time (current-seconds))
(this-wd-num (begin (mutex-lock! *wdnum*mutex) (let ((x *wdnum*)) (set! *wdnum* (add1 *wdnum*)) (mutex-unlock! *wdnum*mutex) x)))
)
(debug:print-info 0 *default-log-port* "watchdog starting. legacy-sync is " legacy-sync" pid="(current-process-id)" this-wd-num="this-wd-num)
(if (and legacy-sync (not *time-to-exit*))
(let ((dbstruct (db:setup)))
(debug:print-info 0 *default-log-port* "Server running, periodic sync started.")
(let loop ()
;;(BB> "watchdog loop. pid="(current-process-id)" this-wd-num="this-wd-num" *time-to-exit*="*time-to-exit*)
;; sync for filesystem local db writes
;;
(mutex-lock! *db-multi-sync-mutex*)
(let* ((need-sync (>= *db-last-access* *db-last-sync*)) ;; no sync since last write
(sync-in-progress *db-sync-in-progress*)
(should-sync (and (not *time-to-exit*)
(> (- (current-seconds) *db-last-sync*) 5))) ;; sync every five seconds minimum
(will-sync (and (or need-sync should-sync)
(not sync-in-progress)))
(start-time (current-seconds)))
;; (debug:print-info 0 *default-log-port* "need-sync: " need-sync " sync-in-progress: " sync-in-progress " should-sync: " should-sync " will-sync: " will-sync)
(if will-sync (set! *db-sync-in-progress* #t))
(mutex-unlock! *db-multi-sync-mutex*)
(if will-sync
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(set! last-time start-time)
(debug:print-info 4 *default-log-port* "timestamp -> " (seconds->time-string (current-seconds)) ", time since start -> " (seconds->hr-min-sec (- (current-seconds) *time-zero*))))))
;; keep going unless time to exit
;;
(if (not *time-to-exit*)
(let delay-loop ((count 0))
(if (and (not *time-to-exit*)
(< count 4)) ;; was 11, changing to 4.
(begin
(thread-sleep! 1)
(delay-loop (+ count 1))))
(loop)))
(if (common:low-noise-print 30)
(debug:print-info 0 *default-log-port* "Exiting watchdog timer, *time-to-exit* = " *time-to-exit*)))))))
(define (std-exit-procedure)
(let ((no-hurry (if *time-to-exit* ;; hurry up
#f
(begin
(set! *time-to-exit* #t)
#t))))
(debug:print-info 4 *default-log-port* "starting exit process, finalizing databases.")
(if (and no-hurry (debug:debug-mode 18))
(rmt:print-db-stats))
(let ((th1 (make-thread (lambda () ;; thread for cleaning up, give it five seconds
(if *dbstruct-db* (db:close-all *dbstruct-db*)) ;; one second allocated
(close-output-port *default-log-port*)
(thread-sleep! 5) ;; give the clean up few seconds to do it's stuff
(thread-sleep! 2))
(debug:print 4 *default-log-port* " ... done")
)
"clean exit")))
(thread-start! th1)
(thread-start! th2)
(thread-join! th1))))
(define (std-signal-handler signum)
;; (signal-mask! signum)
(set! *time-to-exit* #t)
(debug:print-error 0 *default-log-port* "Received signal " signum " exiting promptly")
;; (std-exit-procedure) ;; shouldn't need this since we are exiting and it will be called anyway
(exit))
(set-signal-handler! signal/int std-signal-handler) ;; ^C
(set-signal-handler! signal/term std-signal-handler)
;; (set-signal-handler! signal/stop std-signal-handler) ;; ^Z NO, do NOT handle ^Z!
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(set! last-time start-time)
(debug:print-info 4 *default-log-port* "timestamp -> " (seconds->time-string (current-seconds)) ", time since start -> " (seconds->hr-min-sec (- (current-seconds) *time-zero*))))))
;; keep going unless time to exit
;;
(if (not *time-to-exit*)
(let delay-loop ((count 0))
;;(BB> "delay-loop top; count="count" pid="(current-process-id)" this-wd-num="this-wd-num" *time-to-exit*="*time-to-exit*)
(if (and (not *time-to-exit*)
(< count 4)) ;; was 11, changing to 4.
(begin
(thread-sleep! 1)
(delay-loop (+ count 1))))
(if (not *time-to-exit*) (loop))))
(if (common:low-noise-print 30)
(debug:print-info 0 *default-log-port* "Exiting watchdog timer, *time-to-exit* = " *time-to-exit*" pid="(current-process-id)" this-wd-num="this-wd-num)))))))
(define (std-exit-procedure)
(on-exit (lambda () 0))
;;(BB> "std-exit-procedure called; *time-to-exit*="*time-to-exit*)
(let ((no-hurry (if *time-to-exit* ;; hurry up
#f
(begin
(set! *time-to-exit* #t)
#t))))
(debug:print-info 4 *default-log-port* "starting exit process, finalizing databases.")
(if (and no-hurry (debug:debug-mode 18))
(rmt:print-db-stats))
(let ((th1 (make-thread (lambda () ;; thread for cleaning up, give it five seconds
(if *dbstruct-db* (db:close-all *dbstruct-db*)) ;; one second allocated
(if *task-db*
(let ((db (cdr *task-db*)))
(if (sqlite3:database? db)
(begin
(sqlite3:interrupt! db)
(sqlite3:finalize! db #t)
;; (vector-set! *task-db* 0 #f)
(set! *task-db* #f)))))
(if (and *runremote*
(remote-conndat *runremote*))
(begin
(http-client#close-all-connections!))) ;; for http-client
(if (not (eq? *default-log-port* (current-error-port)))
(close-output-port *default-log-port*))
(set! *default-log-port* (current-error-port))) "Cleanup db exit thread"))
(th2 (make-thread (lambda ()
(debug:print 4 *default-log-port* "Attempting clean exit. Please be patient and wait a few seconds...")
(if no-hurry
(begin
(thread-sleep! 5)) ;; give the clean up few seconds to do it's stuff
(begin
(thread-sleep! 2)))
(debug:print 4 *default-log-port* " ... done")
)
"clean exit")))
(thread-start! th1)
(thread-start! th2)
(thread-join! th1)
)
)
0)
(define (std-signal-handler signum)
;; (signal-mask! signum)
(set! *time-to-exit* #t)
;;(BB> "got signal "signum)
(debug:print-error 0 *default-log-port* "Received signal " signum " exiting promptly")
;; (std-exit-procedure) ;; shouldn't need this since we are exiting and it will be called anyway
(exit))
(set-signal-handler! signal/int std-signal-handler) ;; ^C
(set-signal-handler! signal/term std-signal-handler)
;; (set-signal-handler! signal/stop std-signal-handler) ;; ^Z NO, do NOT handle ^Z!
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(define (common:args-get-state)
(or (args:get-arg "-state")(args:get-arg ":state")))
(define (common:args-get-status)
(or (args:get-arg "-status")(args:get-arg ":status")))
(define (common:args-get-testpatt rconf)
(let* ((rtestpatt (if rconf (runconfigs-get rconf "TESTPATT") #f))
(args-testpatt (or (args:get-arg "-testpatt")
(args:get-arg "-runtests")
"%"))
(testpatt (or (and (equal? args-testpatt "%")
rtestpatt)
args-testpatt)))
(if rtestpatt (debug:print-info 0 *default-log-port* "TESTPATT from runconfigs: " rtestpatt))
testpatt))
(define (common:get-linktree)
(or (getenv "MT_LINKTREE")
(if *configdat*
(configf:lookup *configdat* "setup" "linktree"))))
(define (common:args-get-runname)
(let ((res (or (args:get-arg "-runname")
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(define (common:args-get-state)
(or (args:get-arg "-state")(args:get-arg ":state")))
(define (common:args-get-status)
(or (args:get-arg "-status")(args:get-arg ":status")))
(define (common:args-get-testpatt rconf)
(let* ((tagexpr (args:get-arg "-tagexpr"))
(tags-testpatt (if tagexpr (string-join (runs:get-tests-matching-tags tagexpr) ",") #f))
(testpatt-key (if (args:get-arg "--modepatt") (args:get-arg "--modepatt") "TESTPATT"))
(args-testpatt (or (args:get-arg "-testpatt") (args:get-arg "-runtests") "%"))
(rtestpatt (if rconf (runconfigs-get rconf testpatt-key) #f)))
(cond
(tags-testpatt
(debug:print-info 0 *default-log-port* "-tagexpr "tagexpr" selects testpatt "tags-testpatt)
tags-testpatt)
((and (equal? args-testpatt "%") rtestpatt)
(debug:print-info 0 *default-log-port* "testpatt defined in "testpatt-key" from runconfigs: " rtestpatt)
rtestpatt)
(else args-testpatt))))
(define (common:get-linktree)
(or (getenv "MT_LINKTREE")
(if *configdat*
(configf:lookup *configdat* "setup" "linktree"))))
(define (common:args-get-runname)
(let ((res (or (args:get-arg "-runname")
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(define (common:min-max comp lst)
(if (null? lst)
#f ;; better than an exception for my needs
(fold (lambda (a b)
(if (comp a b) a b))
(car lst)
lst)))
;; path list to hash-table tree
;; ((a b c)(a b d)(e b c)) => ((a (b (d) (c))) (e (b (c))))
;;
(define (common:list->htree lst)
(let ((resh (make-hash-table)))
(for-each
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(define (common:min-max comp lst)
(if (null? lst)
#f ;; better than an exception for my needs
(fold (lambda (a b)
(if (comp a b) a b))
(car lst)
lst)))
;; get min or max, use > for max and < for min, this works around the limits on apply
;;
(define (common:sum lst)
(if (null? lst)
0
(fold (lambda (a b)
(+ a b))
(car lst)
lst)))
;; path list to hash-table tree
;; ((a b c)(a b d)(e b c)) => ((a (b (d) (c))) (e (b (c))))
;;
(define (common:list->htree lst)
(let ((resh (make-hash-table)))
(for-each
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;; lazy-safe get file mod time. on any error (file not existing etc.) return 0
;;
(define (common:lazy-modification-time fpath)
(handle-exceptions
exn
0
(file-modification-time fpath)))
;; return a nice clean pathname made absolute
(define (common:nice-path dir)
(let ((match (string-match "^(~[^\\/]*)(\\/.*|)$" dir)))
(if match ;; using ~ for home?
(common:nice-path (conc (common:read-link-f (cadr match)) "/" (caddr match)))
(normalize-pathname (if (absolute-pathname? dir)
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;; lazy-safe get file mod time. on any error (file not existing etc.) return 0
;;
(define (common:lazy-modification-time fpath)
(handle-exceptions
exn
0
(file-modification-time fpath)))
;; find timestamp of newest file associated with a sqlite db file
(define (common:lazy-sqlite-db-modification-time fpath)
(let* ((glob-list (handle-exceptions
exn
'("/no/such/file")
(glob (conc fpath "*"))))
(file-list (if (eq? 0 (length glob-list))
'("/no/such/file")
glob-list)))
(apply max
(map
common:lazy-modification-time
file-list))))
;; return a nice clean pathname made absolute
(define (common:nice-path dir)
(let ((match (string-match "^(~[^\\/]*)(\\/.*|)$" dir)))
(if match ;; using ~ for home?
(common:nice-path (conc (common:read-link-f (cadr match)) "/" (caddr match)))
(normalize-pathname (if (absolute-pathname? dir)
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(with-input-from-pipe
(conc "ssh " remote-host " cat /proc/loadavg")
(lambda ()(list (read)(read)(read)))))
(with-input-from-file "/proc/loadavg"
(lambda ()(list (read)(read)(read))))))
;; 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 list (normalized-proc-load normalized-core-load 1m 5m 15m ncores nthreads)
;;
(define (common:get-normalized-cpu-load remote-host)
(let ((data (if remote-host
(with-input-from-pipe
(conc "ssh " remote-host " cat /proc/loadavg;cat /proc/cpuinfo;echo end")
read-lines)
(append
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(with-input-from-pipe
(conc "ssh " remote-host " cat /proc/loadavg")
(lambda ()(list (read)(read)(read)))))
(with-input-from-file "/proc/loadavg"
(lambda ()(list (read)(read)(read))))))
;; 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 (common:get-normalized-cpu-load remote-host)
(let ((data (if remote-host
(with-input-from-pipe
(conc "ssh " remote-host " cat /proc/loadavg;cat /proc/cpuinfo;echo end")
read-lines)
(append
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(define (common:unix-ping hostname)
(let ((res (system (conc "ping -c 1 " hostname " > /dev/null"))))
(eq? res 0)))
;; ideally put all this info into the db, no need to preserve it across moving homehost
;;
(define (common:get-least-loaded-host hosts-raw)
(let* ((hosts (filter (lambda (x)
(string-match (regexp "^\\S+$") x))
hosts-raw)))
(if (null? hosts)
#f
;;
;; stategy:
;; sort by last-used and normalized-load
;; if last-updated > 15 seconds then re-update
;; take the host with the lowest load with the lowest last-used (i.e. not used for longest time)
;;
(let ((best-host #f)
(curr-time (current-seconds)))
(for-each
(lambda (hostname)
(let* ((rec (let ((h (hash-table-ref/default *host-loads* hostname #f)))
(if h
h
(let ((h (make-host)))
(hash-table-set! *host-loads* hostname h)
h))))
;; if host hasn't been pinged in 15 sec update it's data
(ping-good (if (< (- curr-time (host-last-update rec)) 15)
(host-reachable rec)
(or (host-reachable rec)
(begin
(host-reachable-set! rec (common:unix-ping hostname))
(host-last-update-set! rec curr-time)
(host-last-cpuload-set! rec (common:get-normalized-cpu-load hostname))
(host-reachable rec))))))
(cond
((not best-host)
(set! best-host hostname))
((and ping-good
(< (alist-ref 'adj-core-load (host-last-cpuload rec))
(alist-ref 'adj-core-load
(host-last-cpuload (hash-table-ref *host-loads* best-host)))))
(set! best-host hostname)))))
hosts)
best-host))))
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(define (common:unix-ping hostname)
(let ((res (system (conc "ping -c 1 " hostname " > /dev/null"))))
(eq? res 0)))
;; ideally put all this info into the db, no need to preserve it across moving homehost
;;
;; return list of
;; ( reachable? cpuload update-time )
(define (common:get-host-info hostname)
(let* ((loadinfo (rmt:get-latest-host-load hostname))
(load (car loadinfo))
(load-sample-time (cdr loadinfo))
(load-sample-age (- (current-seconds) load-sample-time))
(loadinfo-timeout-seconds 20)
(host-last-update-timeout-seconds 10)
(host-rec (hash-table-ref/default *host-loads* hostname #f))
)
(cond
((< load-sample-age loadinfo-timeout-seconds)
(list #t
load-sample-time
load))
((and host-rec
(< (current-seconds) (+ (host-last-update host-rec) host-last-update-timeout-seconds)))
(list #t
(host-last-update host-rec)
(host-last-cpuload host-rec )))
((common:unix-ping hostname)
(list #t
(current-seconds)
(alist-ref 'adj-core-load (common:get-normalized-cpu-load hostname))))
(else
(list #f 0 -1)))))
(define (common:update-host-loads-table hosts-raw)
(let* ((hosts (filter (lambda (x)
(string-match (regexp "^\\S+$") x))
hosts-raw)))
(for-each
(lambda (hostname)
(let* ((rec (let ((h (hash-table-ref/default *host-loads* hostname #f)))
(if h
h
(let ((h (make-host)))
(hash-table-set! *host-loads* hostname h)
h))))
(host-info (common:get-host-info hostname))
(is-reachable (car host-info))
(last-reached-time (cadr host-info))
(load (caddr host-info)))
(host-reachable-set! rec is-reachable)
(host-last-update-set! rec last-reached-time)
(host-last-cpuload-set! rec load)))
hosts)))
(define (common:get-least-loaded-host hosts-raw)
(let* ((hosts (filter (lambda (x)
(string-match (regexp "^\\S+$") x))
hosts-raw))
(best-host #f)
(best-load 99999)
(curr-time (current-seconds)))
(common:update-host-loads-table hosts)
(for-each
(lambda (hostname)
(let* ((rec
(let ((h (hash-table-ref/default *host-loads* hostname #f)))
(if h
h
(let ((h (make-host)))
(hash-table-set! *host-loads* hostname h)
h))))
(reachable (host-reachable rec))
(load (host-last-cpuload rec)))
(cond
((not reachable) #f)
((< (+ load (/ (random 250) 1000)) ;; add a random factor to keep from getting in a rut
(+ best-load (/ (random 250) 1000)) )
(set! best-load load)
(set! best-host hostname)))))
hosts)
best-host))
(define (common:wait-for-cpuload maxload numcpus waitdelay #!key (count 1000) (msg #f)(remote-host #f))
(let* ((loadavg (common:get-cpu-load remote-host))
(first (car loadavg))
(next (cadr loadavg))
(adjload (* maxload numcpus))
(loadjmp (- first next)))
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