aboutsummaryrefslogtreecommitdiff
path: root/guix-data-service/web/server.scm
blob: 6e91809c5cc4eded84fc48b3a4d27494127b5dae (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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
;;; Guix Data Service -- Information about Guix over time
;;; Copyright © 2017 Ricardo Wurmus <rekado@elephly.net>
;;; Copyright © 2019, 2020, 2022, 2023 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 web server)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-11)
  #:use-module (ice-9 match)
  #:use-module (web http)
  #:use-module (web request)
  #:use-module (web uri)
  #:use-module (system repl error-handling)
  #:use-module (ice-9 atomic)
  #:use-module (fibers)
  #:use-module (fibers scheduler)
  #:use-module (fibers conditions)
  #:use-module ((guix build syscalls)
                #:select (set-thread-name))
  #:use-module (prometheus)
  #:use-module (guix-data-service utils)
  #:use-module (guix-data-service database)
  #:use-module (guix-data-service web controller)
  #:use-module (guix-data-service web util)
  #:use-module (guix-data-service model guix-revision-package-derivation)
  #:export (%guix-data-service-metrics-registry

            start-guix-data-service-web-server))

(define (check-startup-completed startup-completed)
  (if (atomic-box-ref startup-completed)
      (begin
        ;; Just in case this atomic-box-ref is expensive, only do it when
        ;; necessary
        (set! check-startup-completed (const #t))
        #t)
      #f))

(define (handler request finished?
                 body controller secret-key-base startup-completed
                 render-metrics)
  (with-exception-handler
      (lambda (exn)
        (with-exception-handler
            (lambda _ #f)
          (lambda ()
            (simple-format (current-error-port)
                           "exception when logging: ~A\n" exn))
          #:unwind? #t)
        ;; If we can't log, exit
        (signal-condition! finished?))
    (lambda ()
      (display
       (format #f "~a ~a\n"
               (request-method request)
               (uri-path (request-uri request)))))
    #:unwind? #t)
  (apply values
         (let-values (((request-components mime-types)
                       (request->path-components-and-mime-type request)))
           (controller request
                       (cons (request-method request)
                             request-components)
                       mime-types
                       body
                       secret-key-base
                       (check-startup-completed startup-completed)
                       render-metrics))))

(define %guix-data-service-metrics-registry
  (make-parameter #f))

(define* (start-guix-data-service-web-server port host secret-key-base
                                             startup-completed
                                             #:key postgresql-statement-timeout
                                             postgresql-connections)
  (define registry
    (make-metrics-registry #:namespace "guixdataservice"))

  (%database-metrics-registry registry)

  (%guix-data-service-metrics-registry registry)

  (let ((finished? (make-condition)))
    (call-with-sigint
     (lambda ()
       (run-fibers
        (lambda ()
          (let* ((current (current-scheduler))
                 (schedulers
                  (cons current (scheduler-remote-peers current))))
            (for-each
             (lambda (i sched)
               (spawn-fiber
                (lambda ()
                  (catch 'system-error
                    (lambda ()
                      (set-thread-name
                       (string-append "fibers " (number->string i))))
                    (const #t)))
                sched))
             (iota (length schedulers))
             schedulers))

          (parameterize
              ((connection-pool
                (make-resource-pool
                 (lambda ()
                   (open-postgresql-connection
                    "web"
                    postgresql-statement-timeout))
                 (floor (/ postgresql-connections 2))
                 #:idle-seconds 30
                 #:destructor
                 (lambda (conn)
                   (close-postgresql-connection conn "web"))))

               (reserved-connection-pool
                (make-resource-pool
                 (lambda ()
                   (open-postgresql-connection
                    "web-reserved"
                    postgresql-statement-timeout))
                 (floor (/ postgresql-connections 2))
                 #:idle-seconds 600
                 #:destructor
                 (lambda (conn)
                   (close-postgresql-connection conn "web-reserved"))))

               (resource-pool-default-timeout 5))

            (let ((resource-pool-checkout-failures-metric
                   (make-counter-metric registry
                                        "resource_pool_checkout_timeouts_total"
                                        #:labels '(pool_name))))
              (%resource-pool-timeout-handler
               (lambda (pool proc timeout)
                 (let ((pool-name
                        (cond
                         ((eq? pool (connection-pool)) "normal")
                         ((eq? pool (reserved-connection-pool)) "reserved")
                         (else #f))))
                   (when pool-name
                     (metric-increment
                      resource-pool-checkout-failures-metric
                      #:label-values `((pool_name . ,pool-name))))))))

            (spawn-fiber
             (lambda ()
               (with-resource-from-pool (connection-pool) conn
                 (backfill-guix-revision-package-derivation-distribution-counts
                  conn))))

            (let ((render-metrics
                   (make-render-metrics registry))
                  (requests-metric
                   (make-counter-metric registry "requests_total")))

              (with-exception-handler
                  (lambda (exn)
                    (simple-format
                     (current-error-port)
                     "\n
error: guix-data-service could not start: ~A

Check if it's already running, or whether another process is using that
port. Also, the port used can be changed by passing the --port option.\n"
                     exn)
                    (primitive-exit 1))
                (lambda ()
                  (run-server/patched
                   (lambda (request body)
                     (metric-increment requests-metric)

                     (handler request finished? body controller
                              secret-key-base
                              startup-completed
                              render-metrics))
                   #:host host
                   #:port port))
                #:unwind? #t)))

          ;; Guile sometimes just seems to stop listening on the port, so try
          ;; and detect this and quit
          (spawn-port-monitoring-fiber port finished?)

          (wait finished?))
        #:parallelism 4))
     finished?)))