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;;; Guix Data Service -- Information about Guix over time
;;; Copyright © 2019 Christopher Baines <mail@cbaines.net>
;;;
;;; This program is free software: you can redistribute it and/or
;;; modify it under the terms of the GNU Affero General Public License
;;; as published by the Free Software Foundation, either version 3 of
;;; the License, or (at your option) any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; Affero General Public License for more details.
;;;
;;; You should have received a copy of the GNU Affero General Public
;;; License along with this program. If not, see
;;; <http://www.gnu.org/licenses/>.
(define-module (guix-data-service jobs)
#:use-module (ice-9 match)
#:use-module (ice-9 format)
#:use-module (ice-9 threads)
#:use-module (ice-9 atomic)
#:use-module (guix-data-service jobs load-new-guix-revision)
#:export (process-jobs
default-max-processes))
(define* (process-jobs conn #:key max-processes
latest-branch-revision-max-processes)
(define (fetch-new-jobs)
(fetch-unlocked-jobs conn))
(define (process-job job-id)
(execlp "guix-data-service-process-job"
"guix-data-service-process-job"
job-id))
(define (handle-job-failure job-id)
(record-job-event conn job-id "failure")
(display (simple-format #f "recording failure for job ~A\n" job-id)
(current-error-port))
(when (> (count-log-parts conn job-id)
0)
(combine-log-parts! conn job-id)))
(process-jobs-concurrently fetch-new-jobs
process-job
handle-job-failure
#:max-processes max-processes
#:priority-max-processes
latest-branch-revision-max-processes))
(define default-max-processes
(max (round (/ (current-processor-count)
4))
1))
(define default-timeout
(* (* 60 60) ;; 1 hour in seconds
72))
(define* (process-jobs-concurrently
fetch-new-jobs
process-job
handle-job-failure
#:key
(max-processes default-max-processes)
(priority-max-processes (* 2 max-processes))
(timeout default-timeout))
(define processes
(make-hash-table))
(define (display-status)
(display
(string-append
"\n\n"
(let ((running-jobs (hash-count (const #t) processes)))
(cond
((eq? running-jobs 0)
"status: 0 running jobs")
((eq? running-jobs 1)
"status: 1 running job")
(else
(simple-format #f "status: ~A running jobs"
running-jobs))))
"\n"
(string-concatenate
(hash-map->list
(match-lambda*
((pid (start-time job-args))
(format #f " pid: ~5d job args: ~a\n"
pid job-args)))
processes))
"\n")))
(define (wait-on-processes)
(catch
#t
(lambda ()
(match (waitpid WAIT_ANY WNOHANG)
((0 . status)
;; No process to wait for
#f)
((pid . status)
(unless (eq? status 0)
(match (hash-ref processes pid)
((_ (id))
(simple-format (current-error-port)
"pid ~A (job: ~A) failed with status ~A\n"
pid id status)
(handle-job-failure id))))
(hashv-remove! processes pid)
;; Recurse, to check for other finished processes.
(wait-on-processes))))
(lambda (key . args)
(simple-format #t "key ~A args ~A\n"
key args))))
(define (kill-long-running-processes)
(hash-map->list
(match-lambda*
((pid (start-time job-args))
(let ((running-for
(- (current-time) start-time)))
(when (> running-for timeout)
(display
(simple-format
#f "sending SIGTERM to pid ~A started at ~A, now running for ~A\n"
pid start-time running-for)
(current-error-port))
(kill pid SIGTERM)
(match job-args
((id)
(handle-job-failure id)))))))
processes))
(define (stop-running-processes)
(hash-map->list
(match-lambda*
((pid (start-time job-args))
(display
(simple-format
#f "sending SIGTERM to pid ~A\n"
pid)
(current-error-port))
(kill pid SIGTERM)))
processes))
(define (fork-and-process-job job-args)
(match (primitive-fork)
(0
(dynamic-wind
(const #t)
(lambda ()
(apply process-job job-args))
(lambda ()
(primitive-exit 127))))
(pid
(hashv-set! processes pid
(list (current-time) job-args))
#t)))
(define exit?
(make-atomic-box #f))
(sigaction SIGTERM
(lambda args
(simple-format (current-error-port) "exiting due to SIGTERM\n")
(atomic-box-set! exit? #t)))
(while #t
(kill-long-running-processes)
(wait-on-processes)
(display-status)
(when (atomic-box-ref exit?)
(stop-running-processes)
(exit 0))
(match (fetch-new-jobs)
(()
;; Nothing to do
#f)
((jobs ...)
(for-each
(match-lambda
((job-id priority?)
(let ((current-processes
(hash-count (const #t) processes)))
(when (< current-processes
(if priority?
priority-max-processes
max-processes))
(fork-and-process-job (list job-id))))))
jobs)))
(sleep 15)))
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