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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2018 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix 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.
+;;;
+;;; GNU Guix 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 GNU Guix. If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix ci)
+ #:use-module (guix http-client)
+ #:autoload (json parser) (json->scm)
+ #:use-module (srfi srfi-9)
+ #:export (build?
+ build-id
+ build-derivation
+ build-system
+ build-status
+ build-timestamp
+
+ %query-limit
+ queued-builds
+ latest-builds))
+
+;;; Commentary:
+;;;
+;;; This module provides a client to the HTTP interface of the Hydra and
+;;; Cuirass continuous integration (CI) tools.
+;;;
+;;; Code:
+
+(define-record-type <build>
+ (make-build id derivation system status timestamp)
+ build?
+ (id build-id) ;integer
+ (derivation build-derivation) ;string | #f
+ (system build-system) ;string
+ (status build-status) ;integer
+ (timestamp build-timestamp)) ;integer
+
+(define %query-limit
+ ;; Max number of builds requested in queries.
+ 1000)
+
+(define (json-fetch url)
+ (let* ((port (http-fetch url))
+ (json (json->scm port)))
+ (close-port port)
+ json))
+
+(define (json->build json)
+ (make-build (hash-ref json "id")
+ (hash-ref json "derivation")
+ (hash-ref json "system")
+ (hash-ref json "buildstatus")
+ (hash-ref json "timestamp")))
+
+(define* (queued-builds url #:optional (limit %query-limit))
+ "Return the list of queued derivations on URL."
+ (let ((queue (json-fetch (string-append url "/api/queue?nr="
+ (number->string limit)))))
+ (map json->build queue)))
+
+(define* (latest-builds url #:optional (limit %query-limit))
+ (let ((latest (json-fetch (string-append url "/api/latestbuilds?nr="
+ (number->string limit)))))
+ ;; Note: Hydra does not provide a "derivation" field for entries in
+ ;; 'latestbuilds', but Cuirass does.
+ (map json->build latest)))