blob: 7e7a533387c5db88aa23c265fba687fd5ee0313a (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
;;; 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 (guix-data-service jobs load-new-guix-revision)
#:export (process-jobs
default-max-processes))
(define* (process-jobs conn #:key 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))
(define default-max-processes
(max (round (/ (current-processor-count)
4))
1))
(define default-timeout
(* (* 60 60) ;; 1 hour in seconds
24))
(define* (process-jobs-concurrently fetch-new-jobs
process-job
handle-job-failure
#:key (max-processes
default-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)
(hashv-remove! processes pid)
(simple-format (current-error-port)
"pid ~A failed with status ~A\n"
pid status)
;; 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 (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)))
(while #t
(kill-long-running-processes)
(wait-on-processes)
(display-status)
(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?
;; For priority jobs, burst up to twice the number
;; of max processes
(* 2 max-processes)
max-processes))
(fork-and-process-job (list job-id))))))
jobs)))
(unless (eq? 0 (sleep 15))
(exit 0))))
|