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;;; 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?)))
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