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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014, 2015, 2016, 2017, 2019 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 tests http)
#:use-module (ice-9 threads)
#:use-module (web server)
#:use-module (web server http)
#:use-module (web response)
#:use-module (srfi srfi-39)
#:use-module (ice-9 match)
#:export (with-http-server
call-with-http-server
%http-server-port
http-server-can-listen?
%local-url))
;;; Commentary:
;;;
;;; Code to spawn a Web server for testing purposes.
;;;
;;; Code:
(define %http-server-port
;; TCP port to use for the stub HTTP server.
(make-parameter 9999))
(define (open-http-server-socket)
"Return a listening socket for the web server. It is useful to export it so
that tests can check whether we succeeded opening the socket and tests skip if
needed."
(catch 'system-error
(lambda ()
(let ((sock (socket PF_INET SOCK_STREAM 0)))
(setsockopt sock SOL_SOCKET SO_REUSEADDR 1)
(bind sock
(make-socket-address AF_INET INADDR_LOOPBACK
(%http-server-port)))
sock))
(lambda args
(let ((err (system-error-errno args)))
(format (current-error-port)
"warning: cannot run Web server for tests: ~a~%"
(strerror err))
#f))))
(define (http-server-can-listen?)
"Return #t if we managed to open a listening socket."
(and=> (open-http-server-socket)
(lambda (socket)
(close-port socket)
#t)))
(define* (%local-url #:optional (port (%http-server-port)))
;; URL to use for 'home-page' tests.
(string-append "http://localhost:" (number->string port)
"/foo/bar"))
(define* (call-with-http-server responses+data thunk)
"Call THUNK with an HTTP server running and returning RESPONSES+DATA on HTTP
requests. Each element of RESPONSES+DATA must be a tuple containing a
response and a string, or an HTTP response code and a string."
(define responses
(map (match-lambda
(((? response? response) data)
(list response data))
(((? integer? code) data)
(list (build-response #:code code
#:reason-phrase "Such is life")
data)))
responses+data))
(define (http-write server client response body)
"Write RESPONSE."
(let* ((response (write-response response client))
(port (response-port response)))
(cond
((not body)) ;pass
(else
(write-response-body response body)))
(close-port port)
(when (null? responses)
(quit #t)) ;exit the server thread
(values)))
;; Mutex and condition variable to synchronize with the HTTP server.
(define %http-server-lock (make-mutex))
(define %http-server-ready (make-condition-variable))
(define (http-open . args)
"Start listening for HTTP requests and signal %HTTP-SERVER-READY."
(with-mutex %http-server-lock
(let ((result (apply (@@ (web server http) http-open) args)))
(signal-condition-variable %http-server-ready)
result)))
(define-server-impl stub-http-server
;; Stripped-down version of Guile's built-in HTTP server.
http-open
(@@ (web server http) http-read)
http-write
(@@ (web server http) http-close))
(define (server-body)
(define (handle request body)
(match responses
(((response data) rest ...)
(set! responses rest)
(values response data))))
(let ((socket (open-http-server-socket)))
(catch 'quit
(lambda ()
(run-server handle stub-http-server
`(#:socket ,socket)))
(lambda _
(close-port socket)))))
(with-mutex %http-server-lock
(let ((server (make-thread server-body)))
(wait-condition-variable %http-server-ready %http-server-lock)
;; Normally SERVER exits automatically once it has received a request.
(thunk))))
(define-syntax with-http-server
(syntax-rules ()
((_ responses+data body ...)
(call-with-http-server responses+data (lambda () body ...)))))
;;; http.scm ends here
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