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Re: [PATCH] Add support for HTTP proxies
From: |
Mark H Weaver |
Subject: |
Re: [PATCH] Add support for HTTP proxies |
Date: |
Tue, 16 Jul 2013 14:14:57 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) |
Hi Ludovic,
address@hidden (Ludovic Courtès) writes:
>> * The 'http-proxy-port?' object property (only needed if you connect to
>> a proxy yourself, without using 'open-socket-for-uri').
>
> What about hiding the fact that it’s an object property, by providing a
> ‘set-http-proxy-port?!’ procedure?
Okay.
>> +(define current-http-proxy (make-parameter 'auto))
>> +
>> +(define (choose-http-proxy)
>> + (let ((proxy (current-http-proxy)))
>> + (if (not (eq? proxy 'auto))
>> + proxy
>> + (let ((proxy (getenv "http_proxy")))
>> + (and (not (equal? proxy ""))
>> + proxy)))))
>
> What about just:
>
> (make-parameter (getenv "http_proxy"))
As Taylan pointed out, http_proxy="" is a widely supported convention
beyond of our control. However, I agree with you that internally, we
should keep it simple and strict, and not support "" as a valid setting
for (current-http-proxy). So how about this:
(define current-http-proxy
(make-parameter (let ((proxy (getenv "http_proxy")))
(and (not (equal? proxy ""))
proxy))))
I've attached an updated patch incorporating your suggestions, and
adding documentation for 'current-http-proxy'. I'm not sure if I want
to bother documenting 'http-proxy-port?' et al.
What do you think?
Regards,
Mark
>From 8a2d0fe7c1308848dab30b496fa4dad84b8a0189 Mon Sep 17 00:00:00 2001
From: Mark H Weaver <address@hidden>
Date: Fri, 7 Jun 2013 00:47:33 -0400
Subject: [PATCH] Add support for HTTP proxies.
* module/web/http.scm (http-proxy-port?, set-http-proxy-port?!): New
exported procedures.
(write-request-line): If we're using an http proxy, write an
absolute-URI in the request line.
* module/web/client.scm: Import (web http).
(current-http-proxy): New exported parameter.
(open-socket-for-uri): If 'current-http-proxy' is not false,
connect to the proxy instead of the URI host, and use
'set-http-proxy-port?!' to make note of that fact.
* doc/ref/web.texi (Web Client): Document 'current-http-proxy'.
---
doc/ref/web.texi | 14 ++++++++++++++
module/web/client.scm | 14 ++++++++++++--
module/web/http.scm | 25 ++++++++++++++++++++++++-
3 files changed, 50 insertions(+), 3 deletions(-)
diff --git a/doc/ref/web.texi b/doc/ref/web.texi
index 0d41f9f..00f851f 100644
--- a/doc/ref/web.texi
+++ b/doc/ref/web.texi
@@ -1459,6 +1459,20 @@ fetcher, similar in structure to the web server
(@pxref{Web Server}).
Another option, good but not as performant, would be to use threads,
possibly via par-map or futures.
address@hidden {Parameter} current-http-proxy
+Either @code{#f} or a non-empty string containing the URL of the HTTP
+proxy server to be used by the procedures in the @code{(web client)}
+module, including @code{open-socket-for-uri}. Its initial value is
+based on the @env{http_proxy} environment variable.
+
address@hidden
+(current-http-proxy) @result{} "http://localhost:8123/"
+(parameterize ((current-http-proxy #f))
+ (http-get "http://example.com/")) ; temporarily bypass proxy
+(current-http-proxy) @result{} "http://localhost:8123/"
address@hidden example
address@hidden deffn
+
@node Web Server
@subsection Web Server
diff --git a/module/web/client.scm b/module/web/client.scm
index 7d5ea49..24132c6 100644
--- a/module/web/client.scm
+++ b/module/web/client.scm
@@ -39,8 +39,10 @@
#:use-module (web request)
#:use-module (web response)
#:use-module (web uri)
+ #:use-module (web http)
#:use-module (srfi srfi-1)
- #:export (open-socket-for-uri
+ #:export (current-http-proxy
+ open-socket-for-uri
http-get
http-get*
http-head
@@ -50,6 +52,11 @@
http-trace
http-options))
+(define current-http-proxy
+ (make-parameter (let ((proxy (getenv "http_proxy")))
+ (and (not (equal? proxy ""))
+ proxy))))
+
(define (ensure-uri uri-or-string)
(cond
((string? uri-or-string) (string->uri uri-or-string))
@@ -58,7 +65,8 @@
(define (open-socket-for-uri uri-or-string)
"Return an open input/output port for a connection to URI."
- (define uri (ensure-uri uri-or-string))
+ (define http-proxy (current-http-proxy))
+ (define uri (ensure-uri (or http-proxy uri-or-string)))
(define addresses
(let ((port (uri-port uri)))
(delete-duplicates
@@ -84,6 +92,8 @@
(setvbuf s _IOFBF)
;; Enlarge the receive buffer.
(setsockopt s SOL_SOCKET SO_RCVBUF (* 12 1024))
+ ;; If we're using a proxy, make a note of that.
+ (when http-proxy (set-http-proxy-port?! s #t))
s)
(lambda args
;; Connection failed, so try one of the other addresses.
diff --git a/module/web/http.scm b/module/web/http.scm
index 35169ef..21d2964 100644
--- a/module/web/http.scm
+++ b/module/web/http.scm
@@ -66,7 +66,10 @@
write-response-line
make-chunked-input-port
- make-chunked-output-port))
+ make-chunked-output-port
+
+ http-proxy-port?
+ set-http-proxy-port?!))
(define (string->header name)
@@ -1117,6 +1120,21 @@ three values: the method, the URI, and the version."
"Write the first line of an HTTP request to PORT."
(display method port)
(display #\space port)
+ (when (http-proxy-port? port)
+ (let ((scheme (uri-scheme uri))
+ (host (uri-host uri))
+ (host-port (uri-port uri)))
+ (when (and scheme host)
+ (display scheme port)
+ (display "://" port)
+ (if (string-index host #\:)
+ (begin (display #\[ port)
+ (display host port)
+ (display #\] port))
+ (display host port))
+ (unless ((@@ (web uri) default-port?) scheme host-port)
+ (display #\: port)
+ (display host-port port)))))
(let ((path (uri-path uri))
(query (uri-query uri)))
(if (not (string-null? path))
@@ -1958,3 +1976,8 @@ KEEP-ALIVE? is true."
(unless keep-alive?
(close-port port)))
(make-soft-port (vector put-char put-string flush #f close) "w"))
+
+(define %http-proxy-port? (make-object-property))
+(define (http-proxy-port? port) (%http-proxy-port? port))
+(define (set-http-proxy-port?! port flag)
+ (set! (%http-proxy-port? port) flag))
--
1.7.10.4
- Re: [PATCH] Add support for HTTP proxies,
Mark H Weaver <=