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;;;; http.scm -- HTTP API
;;; Copyright © 2016 Mathieu Lirzin <mthl@gnu.org>
;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2018 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2018 Clément Lassieur <clement@lassieur.org>
;;;
;;; This file is part of Cuirass.
;;;
;;; Cuirass is free software: you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published by
;;; the Free Software Foundation, either version 3 of the License, or
;;; (at your option) any later version.
;;;
;;; Cuirass 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 General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with Cuirass. If not, see <http://www.gnu.org/licenses/>.
(define-module (cuirass http)
#:use-module (cuirass database)
#:use-module (cuirass utils)
#:use-module (cuirass logging)
#:use-module (srfi srfi-11)
#:use-module (srfi srfi-26)
#:use-module (ice-9 match)
#:use-module (json)
#:use-module (web request)
#:use-module (web response)
#:use-module ((web server) #:hide (run-server))
#:use-module (web uri)
#:use-module (fibers)
#:use-module (fibers channels)
#:export (run-cuirass-server))
(define (build->hydra-build build)
"Convert BUILD to an assoc list matching hydra API format."
(define (bool->int bool)
(if bool 1 0))
(define finished?
(not (memv (assq-ref build #:status)
(list (build-status scheduled)
(build-status started)))))
`((#:id . ,(assq-ref build #:id))
(#:jobset . ,(assq-ref build #:repo-name))
(#:job . ,(assq-ref build #:job-name))
;; Hydra's API uses "timestamp" as the time of the last useful event for
;; that build: evaluation or completion.
(#:timestamp . ,(if finished?
(assq-ref build #:stoptime)
(assq-ref build #:timestamp)))
(#:starttime . ,(assq-ref build #:starttime))
(#:stoptime . ,(assq-ref build #:stoptime))
(#:derivation . ,(assq-ref build #:derivation))
(#:buildoutputs . ,(assq-ref build #:outputs))
(#:system . ,(assq-ref build #:system))
(#:nixname . ,(assq-ref build #:nix-name))
(#:buildstatus . ,(assq-ref build #:status))
(#:busy . ,(bool->int (eqv? (build-status started)
(assq-ref build #:status))))
(#:priority . 0)
(#:finished . ,(bool->int finished?))
(#:buildproducts . #nil)
(#:releasename . #nil)
(#:buildinputs_builds . #nil)))
(define (handle-build-request db-channel build-id)
"Retrieve build identified by BUILD-ID over DB-CHANNEL and convert it to
hydra format. Return #f is not build was found."
(let ((build (with-critical-section db-channel (db)
(db-get-build db build-id))))
(and=> build build->hydra-build)))
(define (handle-builds-request db-channel filters)
"Retrieve all builds matched by FILTERS in DB-CHANNEL and convert them to
Hydra format."
(let ((builds (with-critical-section db-channel (db)
(with-time-logging "builds request"
(db-get-builds db filters)))))
(map build->hydra-build builds)))
(define (request-parameters request)
"Parse the REQUEST query parameters and return them under the form
'((parameter value) ...)."
(let* ((uri (request-uri request))
(query (uri-query uri)))
(if query
(map (lambda (param)
(match (string-split param #\=)
((key param)
(let ((key-symbol (string->symbol key)))
(list key-symbol
(match key-symbol
('id (string->number param))
('nr (string->number param))
(_ param)))))))
(string-split query #\&))
'())))
;;;
;;; Web server.
;;;
;;; The api is derived from the hydra one. It is partially described here :
;;;
;;; https://github.com/NixOS/hydra/blob/master/doc/manual/api.xml
;;;
(define (request-path-components request)
(split-and-decode-uri-path (uri-path (request-uri request))))
(define (url-handler request body db-channel)
(define* (respond response #:key body (db-channel db-channel))
(values response body db-channel))
(define-syntax-rule (respond-json body ...)
(respond '((content-type . (application/json)))
#:body body ...))
(define-syntax-rule (respond-text body ...)
(respond '((content-type . (text/plain)))
#:body body ...))
(define-syntax-rule (respond-json-with-error error-code message)
(respond
(build-response #:headers '((content-type . (application/json)))
#:code error-code)
#:body
(object->json-string
`((error . ,message)))))
(define (respond-build-not-found build-id)
(respond-json-with-error
404
(format #f "Build with ID ~a doesn't exist." build-id)))
(define (respond-build-log-not-found build)
(let ((drv (assq-ref build #:derivation)))
(respond-json-with-error
404
(format #f "The build log of derivation ~a is not available." drv))))
(log-message "~a ~a" (request-method request)
(uri-path (request-uri request)))
;; Reject OPTIONS, POST, etc.
(match (if (eq? 'GET (request-method request))
(request-path-components request)
'method-not-allowed)
(((or "jobsets" "specifications") . rest)
(respond-json (object->json-string
(with-critical-section db-channel (db)
(db-get-specifications db)))))
(("build" build-id)
(let ((hydra-build (handle-build-request db-channel
(string->number build-id))))
(if hydra-build
(respond-json (object->json-string hydra-build))
(respond-build-not-found build-id))))
(("build" build-id "log" "raw")
(let ((build (with-critical-section db-channel (db)
(db-get-build db (string->number build-id)))))
(if build
(match (assq-ref build #:outputs)
(((_ (#:path . (? string? output))) _ ...)
;; Redirect to a /log URL, which is assumed to be served
;; by 'guix publish'.
(let ((uri (string->uri-reference
(string-append "/log/"
(basename output)))))
(respond (build-response #:code 302
#:headers `((location . ,uri)))
#:body "")))
(()
;; Not entry for BUILD-ID in the 'Outputs' table.
(respond-json-with-error
500
(format #f "Outputs of build ~a are unknown." build-id)))
(#f
(respond-build-not-found build-id)))
(respond-build-not-found build-id))))
(("api" "evaluations")
(let* ((params (request-parameters request))
;; 'nr parameter is mandatory to limit query size.
(nr (match (assq-ref params 'nr)
((val) val)
(_ #f))))
(if nr
(respond-json (object->json-string
(with-critical-section db-channel (db)
(db-get-evaluations db nr))))
(respond-json-with-error 500 "Parameter not defined!"))))
(("api" "latestbuilds")
(let* ((params (request-parameters request))
;; 'nr parameter is mandatory to limit query size.
(valid-params? (assq-ref params 'nr)))
(if valid-params?
;; Limit results to builds that are "done".
(respond-json (object->json-string
(handle-builds-request db-channel
`((status done)
,@params
(order finish-time)))))
(respond-json-with-error 500 "Parameter not defined!"))))
(("api" "queue")
(let* ((params (request-parameters request))
;; 'nr parameter is mandatory to limit query size.
(valid-params? (assq-ref params 'nr)))
(if valid-params?
(respond-json
(object->json-string
;; Use the 'status+submission-time' order so that builds in
;; 'running' state appear before builds in 'scheduled' state.
(handle-builds-request db-channel
`((status pending)
,@params
(order status+submission-time)))))
(respond-json-with-error 500 "Parameter not defined!"))))
('method-not-allowed
;; 405 "Method Not Allowed"
(values (build-response #:code 405) #f db-channel))
(_
(respond (build-response #:code 404)
#:body (string-append "Resource not found: "
(uri->string (request-uri request)))))))
(define* (run-cuirass-server db #:key (host "localhost") (port 8080))
(let* ((host-info (gethostbyname host))
(address (inet-ntop (hostent:addrtype host-info)
(car (hostent:addr-list host-info))))
;; Spawn a fiber to process database queries sequentially. We need
;; this because guile-sqlite3 handles are not thread-safe (caching in
;; particular), and creating one new handle for each request would be
;; costly and may defeat statement caching.
(db-channel (make-critical-section db)))
(log-message "listening on ~A:~A" address port)
;; Here we use our own web backend, call 'fiberized'. We cannot use the
;; 'fibers' backend that comes with Fibers 1.0.0 because it does its own
;; thread creations and calls 'run-fibers' by itself, which isn't
;; necessary here (and harmful).
;;
;; In addition, we roll our own instead of using Guile's 'run-server' and
;; 'serve-one-client'. The key thing here is that we spawn a fiber to
;; process each client request and then directly go back waiting for the
;; next client (conversely, Guile's 'run-server' loop processes clients
;; one after another, sequentially.) We can do that because we don't
;; maintain any state across connections.
;;
;; XXX: We don't do 'call-with-sigint' like 'run-server' does.
(let* ((impl (lookup-server-impl 'fiberized))
(server (open-server impl `(#:host ,address #:port ,port))))
(let loop ()
(let-values (((client request body)
(read-client impl server)))
;; Spawn a fiber to handle REQUEST and reply to CLIENT.
(spawn-fiber
(lambda ()
(let-values (((response body state)
(handle-request (cut url-handler <> <> db-channel)
request body '())))
(write-client impl server client response body)))))
(loop)))))
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