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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>
;;;
;;; 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 (ice-9 match)
#:use-module (json)
#:use-module (web request)
#:use-module (web response)
#:use-module (web server)
#:use-module (web uri)
#:export (run-cuirass-server))
(define (build->hydra-build build)
"Convert BUILD to an assoc list matching hydra API format."
`((#:id . ,(assq-ref build #:id))
(#:project . ,(assq-ref build #:repo-name))
(#:jobset . ,(assq-ref build #:branch))
(#:job . ,(assq-ref build #:job-name))
(#:timestamp . ,(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))
;; TODO: Fill the fields above with correct values.
(#:busy . 0)
(#:priority . 0)
(#:finished . 1)
(#:buildproducts . #nil)
(#:releasename . #nil)
(#:buildinputs_builds . #nil)))
(define (handle-build-request db build-id)
"Retrieve build identified by BUILD-ID in DB and convert it to hydra
format. Return #f is not build was found."
(let ((build (db-get-build db build-id)))
(and=> build build->hydra-build)))
(define (handle-builds-request db filters)
"Retrieve all builds matched by FILTERS in DB and convert them to hydra
format."
(let ((builds (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)))
(and query
(map (lambda (param)
(match (string-split param #\=)
((key param)
(list (string->symbol key) 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)
(define* (respond response #:key body (db db))
(values response body db))
(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))))
(match (request-path-components request)
(((or "jobsets" "specifications") . rest)
(respond-json (object->json-string (car (db-get-specifications db)))))
(("build" build-id)
(let ((hydra-build (handle-build-request db 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 (db-get-build db 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" "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
`((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
(handle-builds-request db
`((status pending)
,@params
(order submission-time)))))
(respond-json-with-error 500 "Parameter not defined!"))))
(_
(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)))))
(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).
(run-server url-handler
'fiberized
`(#:host ,address #:port ,port)
db)))
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