[ViewVC] Diff of: cvs/AnyEvent-HTTP/HTTP.pm

Comparing AnyEvent-HTTP/HTTP.pm (file contents):
Revision 1.1 by root, Tue Jun 3 16:37:13 2008 UTC vs.
Revision 1.59 by root, Wed Dec 29 23:59:36 2010 UTC

…		…
3	AnyEvent::HTTP - simple but non-blocking HTTP/HTTPS client	3	AnyEvent::HTTP - simple but non-blocking HTTP/HTTPS client
4		4
5	=head1 SYNOPSIS	5	=head1 SYNOPSIS
6		6
7	use AnyEvent::HTTP;	7	use AnyEvent::HTTP;
		8
		9	http_get "http://www.nethype.de/", sub { print $_[1] };
		10
		11	# ... do something else here
8		12
9	=head1 DESCRIPTION	13	=head1 DESCRIPTION
10		14
11	This module is an L<AnyEvent> user, you need to make sure that you use and	15	This module is an L<AnyEvent> user, you need to make sure that you use and
12	run a supported event loop.	16	run a supported event loop.
13		17
		18	This module implements a simple, stateless and non-blocking HTTP
		19	client. It supports GET, POST and other request methods, cookies and more,
		20	all on a very low level. It can follow redirects supports proxies and
		21	automatically limits the number of connections to the values specified in
		22	the RFC.
		23
		24	It should generally be a "good client" that is enough for most HTTP
		25	tasks. Simple tasks should be simple, but complex tasks should still be
		26	possible as the user retains control over request and response headers.
		27
		28	The caller is responsible for authentication management, cookies (if
		29	the simplistic implementation in this module doesn't suffice), referer
		30	and other high-level protocol details for which this module offers only
		31	limited support.
		32
14	=head2 METHODS	33	=head2 METHODS
15		34
16	=over 4	35	=over 4
17		36
18	=cut	37	=cut
…		…
20	package AnyEvent::HTTP;	39	package AnyEvent::HTTP;
21		40
22	use strict;	41	use strict;
23	no warnings;	42	no warnings;
24		43
25	use Carp;	44	use Errno ();
26		45
27	use AnyEvent ();	46	use AnyEvent 5.0 ();
28	use AnyEvent::Util ();	47	use AnyEvent::Util ();
29	use AnyEvent::Socket ();
30	use AnyEvent::Handle ();	48	use AnyEvent::Handle ();
31		49
32	use base Exporter::;	50	use base Exporter::;
33		51
34	our $VERSION = '1.0';	52	our $VERSION = '1.46';
35		53
36	our @EXPORT = qw(http_get http_request);	54	our @EXPORT = qw(http_get http_post http_head http_request);
37		55
38	our $MAX_REDIRECTS = 10;
39	our $USERAGENT = "Mozilla/5.0 (compatible; AnyEvent::HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)";	56	our $USERAGENT = "Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)";
		57	our $MAX_RECURSE = 10;
40	our $MAX_PERSISTENT = 8;	58	our $MAX_PERSISTENT = 8;
41	our $PERSISTENT_TIMEOUT = 15;	59	our $PERSISTENT_TIMEOUT = 2;
42	our $TIMEOUT = 60;	60	our $TIMEOUT = 300;
43		61
44	# changing these is evil	62	# changing these is evil
45	our $MAX_PERSISTENT_PER_HOST = 2;	63	our $MAX_PERSISTENT_PER_HOST = 0;
46	our $MAX_PER_HOST = 4; # not respected yet :(	64	our $MAX_PER_HOST = 4;
		65
		66	our $PROXY;
		67	our $ACTIVE = 0;
47		68
48	my %KA_COUNT; # number of open keep-alive connections per host	69	my %KA_COUNT; # number of open keep-alive connections per host
		70	my %CO_SLOT; # number of open connections, and wait queue, per host
49		71
50	=item http_get $url, key => value..., $cb->($data, $headers)	72	=item http_get $url, key => value..., $cb->($data, $headers)
51		73
52	Executes an HTTP-GET request. See the http_request function for details on	74	Executes an HTTP-GET request. See the http_request function for details on
53	additional parameters.	75	additional parameters and the return value.
		76
		77	=item http_head $url, key => value..., $cb->($data, $headers)
		78
		79	Executes an HTTP-HEAD request. See the http_request function for details
		80	on additional parameters and the return value.
		81
		82	=item http_post $url, $body, key => value..., $cb->($data, $headers)
		83
		84	Executes an HTTP-POST request with a request body of C<$body>. See the
		85	http_request function for details on additional parameters and the return
		86	value.
54		87
55	=item http_request $method => $url, key => value..., $cb->($data, $headers)	88	=item http_request $method => $url, key => value..., $cb->($data, $headers)
56		89
57	Executes a HTTP request of type C<$method> (e.g. C<GET>, C<POST>). The URL	90	Executes a HTTP request of type C<$method> (e.g. C<GET>, C<POST>). The URL
58	must be an absolute http or https URL.	91	must be an absolute http or https URL.
59		92
		93	When called in void context, nothing is returned. In other contexts,
		94	C<http_request> returns a "cancellation guard" - you have to keep the
		95	object at least alive until the callback get called. If the object gets
		96	destroyed before the callback is called, the request will be cancelled.
		97
		98	The callback will be called with the response body data as first argument
		99	(or C<undef> if an error occured), and a hash-ref with response headers as
		100	second argument.
		101
		102	All the headers in that hash are lowercased. In addition to the response
		103	headers, the "pseudo-headers" (uppercase to avoid clashing with possible
		104	response headers) C<HTTPVersion>, C<Status> and C<Reason> contain the
		105	three parts of the HTTP Status-Line of the same name.
		106
		107	The pseudo-header C<URL> contains the actual URL (which can differ from
		108	the requested URL when following redirects - for example, you might get
		109	an error that your URL scheme is not supported even though your URL is a
		110	valid http URL because it redirected to an ftp URL, in which case you can
		111	look at the URL pseudo header).
		112
		113	The pseudo-header C<Redirect> only exists when the request was a result
		114	of an internal redirect. In that case it is an array reference with
		115	the C<($data, $headers)> from the redirect response. Note that this
		116	response could in turn be the result of a redirect itself, and C<<
		117	$headers->{Redirect}[1]{Redirect} >> will then contain the original
		118	response, and so on.
		119
		120	If the server sends a header multiple times, then their contents will be
		121	joined together with a comma (C<,>), as per the HTTP spec.
		122
		123	If an internal error occurs, such as not being able to resolve a hostname,
		124	then C<$data> will be C<undef>, C<< $headers->{Status} >> will be C<59x>
		125	(usually C<599>) and the C<Reason> pseudo-header will contain an error
		126	message.
		127
		128	A typical callback might look like this:
		129
		130	sub {
		131	my ($body, $hdr) = @_;
		132
		133	if ($hdr->{Status} =~ /^2/) {
		134	... everything should be ok
		135	} else {
		136	print "error, $hdr->{Status} $hdr->{Reason}\n";
		137	}
		138	}
		139
60	Additional parameters are key-value pairs, and are fully optional. They	140	Additional parameters are key-value pairs, and are fully optional. They
61	include:	141	include:
62		142
63	=over 4	143	=over 4
64		144
65	=item recurse => $boolean (default: true)	145	=item recurse => $count (default: $MAX_RECURSE)
66		146
67	Whether to recurse requests or not, e.g. on redirects, authentication	147	Whether to recurse requests or not, e.g. on redirects, authentication
68	retries and so on.	148	retries and so on, and how often to do so.
69		149
70	=item headers => hashref	150	=item headers => hashref
71		151
72	The request headers to use.	152	The request headers to use. Currently, C<http_request> may provide its
		153	own C<Host:>, C<Content-Length:>, C<Connection:> and C<Cookie:> headers
		154	and will provide defaults for C<User-Agent:> and C<Referer:> (this can be
		155	suppressed by using C<undef> for these headers in which case they won't be
		156	sent at all).
73		157
74	=item timeout => $seconds	158	=item timeout => $seconds
75		159
76	The time-out to use for various stages - each connect attempt will reset	160	The time-out to use for various stages - each connect attempt will reset
77	the timeout, as will read or write activity.	161	the timeout, as will read or write activity, i.e. this is not an overall
		162	timeout.
		163
		164	Default timeout is 5 minutes.
		165
		166	=item proxy => [$host, $port[, $scheme]] or undef
		167
		168	Use the given http proxy for all requests. If not specified, then the
		169	default proxy (as specified by C<$ENV{http_proxy}>) is used.
		170
		171	C<$scheme> must be either missing, C<http> for HTTP or C<https> for
		172	HTTPS.
		173
		174	=item body => $string
		175
		176	The request body, usually empty. Will be-sent as-is (future versions of
		177	this module might offer more options).
		178
		179	=item cookie_jar => $hash_ref
		180
		181	Passing this parameter enables (simplified) cookie-processing, loosely
		182	based on the original netscape specification.
		183
		184	The C<$hash_ref> must be an (initially empty) hash reference which will
		185	get updated automatically. It is possible to save the cookie_jar to
		186	persistent storage with something like JSON or Storable, but this is not
		187	recommended, as expiry times are currently being ignored.
		188
		189	Note that this cookie implementation is not of very high quality, nor
		190	meant to be complete. If you want complete cookie management you have to
		191	do that on your own. C<cookie_jar> is meant as a quick fix to get some
		192	cookie-using sites working. Cookies are a privacy disaster, do not use
		193	them unless required to.
		194
		195	=item tls_ctx => $scheme \| $tls_ctx
		196
		197	Specifies the AnyEvent::TLS context to be used for https connections. This
		198	parameter follows the same rules as the C<tls_ctx> parameter to
		199	L<AnyEvent::Handle>, but additionally, the two strings C<low> or
		200	C<high> can be specified, which give you a predefined low-security (no
		201	verification, highest compatibility) and high-security (CA and common-name
		202	verification) TLS context.
		203
		204	The default for this option is C<low>, which could be interpreted as "give
		205	me the page, no matter what".
		206
		207	=item on_prepare => $callback->($fh)
		208
		209	In rare cases you need to "tune" the socket before it is used to
		210	connect (for exmaple, to bind it on a given IP address). This parameter
		211	overrides the prepare callback passed to C<AnyEvent::Socket::tcp_connect>
		212	and behaves exactly the same way (e.g. it has to provide a
		213	timeout). See the description for the C<$prepare_cb> argument of
		214	C<AnyEvent::Socket::tcp_connect> for details.
		215
		216	=item tcp_connect => $callback->($host, $service, $connect_cb, $prepare_cb)
		217
		218	In even rarer cases you want total control over how AnyEvent::HTTP
		219	establishes connections. Normally it uses L<AnyEvent::Socket::tcp_connect>
		220	to do this, but you can provide your own C<tcp_connect> function -
		221	obviously, it has to follow the same calling conventions.
		222
		223	There are probably lots of weird uses for this function, starting from
		224	tracing the hosts C<http_request> actually tries to connect, to (inexact
		225	but fast) host => IP address caching or even socks protocol support.
		226
		227	=item on_header => $callback->($headers)
		228
		229	When specified, this callback will be called with the header hash as soon
		230	as headers have been successfully received from the remote server (not on
		231	locally-generated errors).
		232
		233	It has to return either true (in which case AnyEvent::HTTP will continue),
		234	or false, in which case AnyEvent::HTTP will cancel the download (and call
		235	the finish callback with an error code of C<598>).
		236
		237	This callback is useful, among other things, to quickly reject unwanted
		238	content, which, if it is supposed to be rare, can be faster than first
		239	doing a C<HEAD> request.
		240
		241	Example: cancel the request unless the content-type is "text/html".
		242
		243	on_header => sub {
		244	$_[0]{"content-type"} =~ /^text\/html\s*(?:;\|$)/
		245	},
		246
		247	=item on_body => $callback->($partial_body, $headers)
		248
		249	When specified, all body data will be passed to this callback instead of
		250	to the completion callback. The completion callback will get the empty
		251	string instead of the body data.
		252
		253	It has to return either true (in which case AnyEvent::HTTP will continue),
		254	or false, in which case AnyEvent::HTTP will cancel the download (and call
		255	the completion callback with an error code of C<598>).
		256
		257	This callback is useful when the data is too large to be held in memory
		258	(so the callback writes it to a file) or when only some information should
		259	be extracted, or when the body should be processed incrementally.
		260
		261	It is usually preferred over doing your own body handling via
		262	C<want_body_handle>, but in case of streaming APIs, where HTTP is
		263	only used to create a connection, C<want_body_handle> is the better
		264	alternative, as it allows you to install your own event handler, reducing
		265	resource usage.
		266
		267	=item want_body_handle => $enable
		268
		269	When enabled (default is disabled), the behaviour of AnyEvent::HTTP
		270	changes considerably: after parsing the headers, and instead of
		271	downloading the body (if any), the completion callback will be
		272	called. Instead of the C<$body> argument containing the body data, the
		273	callback will receive the L<AnyEvent::Handle> object associated with the
		274	connection. In error cases, C<undef> will be passed. When there is no body
		275	(e.g. status C<304>), the empty string will be passed.
		276
		277	The handle object might or might not be in TLS mode, might be connected to
		278	a proxy, be a persistent connection etc., and configured in unspecified
		279	ways. The user is responsible for this handle (it will not be used by this
		280	module anymore).
		281
		282	This is useful with some push-type services, where, after the initial
		283	headers, an interactive protocol is used (typical example would be the
		284	push-style twitter API which starts a JSON/XML stream).
		285
		286	If you think you need this, first have a look at C<on_body>, to see if
		287	that doesn't solve your problem in a better way.
78		288
79	=back	289	=back
80		290
81	=back	291	Example: make a simple HTTP GET request for http://www.nethype.de/
		292
		293	http_request GET => "http://www.nethype.de/", sub {
		294	my ($body, $hdr) = @_;
		295	print "$body\n";
		296	};
		297
		298	Example: make a HTTP HEAD request on https://www.google.com/, use a
		299	timeout of 30 seconds.
		300
		301	http_request
		302	GET => "https://www.google.com",
		303	timeout => 30,
		304	sub {
		305	my ($body, $hdr) = @_;
		306	use Data::Dumper;
		307	print Dumper $hdr;
		308	}
		309	;
		310
		311	Example: make another simple HTTP GET request, but immediately try to
		312	cancel it.
		313
		314	my $request = http_request GET => "http://www.nethype.de/", sub {
		315	my ($body, $hdr) = @_;
		316	print "$body\n";
		317	};
		318
		319	undef $request;
82		320
83	=cut	321	=cut
84		322
		323	sub _slot_schedule;
		324	sub _slot_schedule($) {
		325	my $host = shift;
		326
		327	while ($CO_SLOT{$host}[0] < $MAX_PER_HOST) {
		328	if (my $cb = shift @{ $CO_SLOT{$host}[1] }) {
		329	# somebody wants that slot
		330	++$CO_SLOT{$host}[0];
		331	++$ACTIVE;
		332
		333	$cb->(AnyEvent::Util::guard {
		334	--$ACTIVE;
		335	--$CO_SLOT{$host}[0];
		336	_slot_schedule $host;
		337	});
		338	} else {
		339	# nobody wants the slot, maybe we can forget about it
		340	delete $CO_SLOT{$host} unless $CO_SLOT{$host}[0];
		341	last;
		342	}
		343	}
		344	}
		345
		346	# wait for a free slot on host, call callback
		347	sub _get_slot($$) {
		348	push @{ $CO_SLOT{$_[0]}[1] }, $_[1];
		349
		350	_slot_schedule $_[0];
		351	}
		352
		353	our $qr_nlnl = qr{(?<![^\012])\015?\012};
		354
		355	our $TLS_CTX_LOW = { cache => 1, sslv2 => 1 };
		356	our $TLS_CTX_HIGH = { cache => 1, verify => 1, verify_peername => "https" };
		357
85	sub http_request($$$;@) {	358	sub http_request($$@) {
86	my $cb = pop;	359	my $cb = pop;
87	my ($method, $url, %arg) = @_;	360	my ($method, $url, %arg) = @_;
88		361
89	my %hdr;	362	my %hdr;
90		363
		364	$arg{tls_ctx} = $TLS_CTX_LOW if $arg{tls_ctx} eq "low" \|\| !exists $arg{tls_ctx};
		365	$arg{tls_ctx} = $TLS_CTX_HIGH if $arg{tls_ctx} eq "high";
		366
		367	$method = uc $method;
		368
91	if (my $hdr = delete $arg{headers}) {	369	if (my $hdr = $arg{headers}) {
92	while (my ($k, $v) = each %$hdr) {	370	while (my ($k, $v) = each %$hdr) {
93	$hdr{lc $k} = $v;	371	$hdr{lc $k} = $v;
94	}	372	}
95	}	373	}
96		374
		375	# pseudo headers for all subsequent responses
		376	my @pseudo = (URL => $url);
		377	push @pseudo, Redirect => delete $arg{Redirect} if exists $arg{Redirect};
		378
		379	my $recurse = exists $arg{recurse} ? delete $arg{recurse} : $MAX_RECURSE;
		380
		381	return $cb->(undef, { Status => 599, Reason => "Too many redirections", @pseudo })
		382	if $recurse < 0;
		383
		384	my $proxy = $arg{proxy} \|\| $PROXY;
97	my $timeout = $arg{timeout} \|\| $TIMEOUT;	385	my $timeout = $arg{timeout} \|\| $TIMEOUT;
98		386
99	$hdr{"user-agent"} \|\|= $USERAGENT;
100
101	my ($scheme, $authority, $path, $query, $fragment) =	387	my ($uscheme, $uauthority, $upath, $query, $fragment) =
102	$url =~ m\|(?:([^:/?#]+):)?(?://([^/?#]))?([^?#])(?:\?([^#]))?(?:#(.))?\|;	388	$url =~ m\|(?:([^:/?#]+):)?(?://([^/?#]))?([^?#])(?:(\?[^#]))?(?:#(.))?\|;
103		389
104	$scheme = lc $scheme;	390	$uscheme = lc $uscheme;
		391
105	my $port = $scheme eq "http" ? 80	392	my $uport = $uscheme eq "http" ? 80
106	: $scheme eq "https" ? 443	393	: $uscheme eq "https" ? 443
107	: croak "$url: only http and https URLs supported";	394	: return $cb->(undef, { Status => 599, Reason => "Only http and https URL schemes supported", @pseudo });
108		395
109	$authority =~ /^(?: .*\@ )? ([^\@:]+) (?: : (\d+) )?$/x	396	$uauthority =~ /^(?: .*\@ )? ([^\@:]+) (?: : (\d+) )?$/x
110	or croak "$authority: unparsable URL";	397	or return $cb->(undef, { Status => 599, Reason => "Unparsable URL", @pseudo });
111		398
112	my $host = $1;	399	my $uhost = $1;
113	$port = $2 if defined $2;	400	$uport = $2 if defined $2;
114		401
		402	$hdr{host} = defined $2 ? "$uhost:$2" : "$uhost"
		403	unless exists $hdr{host};
		404
115	$host =~ s/^\[(.*)\]$/$1/;	405	$uhost =~ s/^\[(.*)\]$/$1/;
116	$path .= "?$query" if length $query;	406	$upath .= $query if length $query;
117		407
118	$hdr{host} = $host = lc $host;	408	$upath =~ s%^/?%/%;
119		409
120	my %state;	410	# cookie processing
121		411	if (my $jar = $arg{cookie_jar}) {
122	my $body = "";	412	%$jar = () if $jar->{version} != 1;
123	$state{body} = $body;	413
124		414	my @cookie;
125	$hdr{"content-length"} = length $body;	415
126		416	while (my ($chost, $v) = each %$jar) {
127	$state{connect_guard} = AnyEvent::Socket::tcp_connect $host, $port, sub {	417	if ($chost =~ /^\./) {
128	$state{fh} = shift	418	next unless $chost eq substr $uhost, -length $chost;
129	or return $cb->(undef, { Status => 599, Reason => "$!" });	419	} elsif ($chost =~ /\./) {
130		420	next unless $chost eq $uhost;
131	delete $state{connect_guard}; # reduce memory usage, save a tree
132
133	# get handle
134	$state{handle} = new AnyEvent::Handle
135	fh => $state{fh},
136	($scheme eq "https" ? (tls => "connect") : ());
137
138	# limit the number of persistent connections
139	if ($KA_COUNT{$_[1]} < $MAX_PERSISTENT_PER_HOST) {
140	++$KA_COUNT{$_[1]};
141	$state{handle}{ka_count_guard} = AnyEvent::Util::guard { --$KA_COUNT{$_[1]} };
142	$hdr{connection} = "keep-alive";
143	} else {	421	} else {
144	delete $hdr{connection};	422	next;
		423	}
		424
		425	while (my ($cpath, $v) = each %$v) {
		426	next unless $cpath eq substr $upath, 0, length $cpath;
		427
		428	while (my ($k, $v) = each %$v) {
		429	next if $uscheme ne "https" && exists $v->{secure};
		430	my $value = $v->{value};
		431	$value =~ s/([\\"])/\\$1/g;
		432	push @cookie, "$k=\"$value\"";
		433	}
		434	}
145	}	435	}
		436
		437	$hdr{cookie} = join "; ", @cookie
		438	if @cookie;
		439	}
146		440
147	# (re-)configure handle	441	my ($rhost, $rport, $rscheme, $rpath); # request host, port, path
148	$state{handle}->timeout ($timeout);	442
149	$state{handle}->on_error (sub {	443	if ($proxy) {
		444	($rpath, $rhost, $rport, $rscheme) = ($url, @$proxy);
		445
		446	$rscheme = "http" unless defined $rscheme;
		447
		448	# don't support https requests over https-proxy transport,
		449	# can't be done with tls as spec'ed, unless you double-encrypt.
		450	$rscheme = "http" if $uscheme eq "https" && $rscheme eq "https";
		451	} else {
		452	($rhost, $rport, $rscheme, $rpath) = ($uhost, $uport, $uscheme, $upath);
		453	}
		454
		455	# leave out fragment and query string, just a heuristic
		456	$hdr{referer} \|\|= "$uscheme://$uauthority$upath" unless exists $hdr{referer};
		457	$hdr{"user-agent"} \|\|= $USERAGENT unless exists $hdr{"user-agent"};
		458
		459	$hdr{"content-length"} = length $arg{body}
		460	if length $arg{body} \|\| $method ne "GET";
		461
		462	my %state = (connect_guard => 1);
		463
		464	_get_slot $uhost, sub {
		465	$state{slot_guard} = shift;
		466
		467	return unless $state{connect_guard};
		468
		469	my $tcp_connect = $arg{tcp_connect}
		470	\|\| do { require AnyEvent::Socket; \&AnyEvent::Socket::tcp_connect };
		471
		472	$state{connect_guard} = $tcp_connect->(
		473	$rhost,
		474	$rport,
		475	sub {
		476	$state{fh} = shift
		477	or do {
		478	my $err = "$!";
150	%state = ();	479	%state = ();
151	$cb->(undef, { Status => 599, Reason => "$!" });	480	return $cb->(undef, { Status => 599, Reason => $err, @pseudo });
152	});	481	};
153	$state{handle}->on_eof (sub {	482
		483	pop; # free memory, save a tree
		484
		485	return unless delete $state{connect_guard};
		486
		487	# get handle
		488	$state{handle} = new AnyEvent::Handle
		489	fh => $state{fh},
		490	peername => $rhost,
		491	tls_ctx => $arg{tls_ctx},
		492	# these need to be reconfigured on keepalive handles
		493	timeout => $timeout,
		494	on_error => sub {
154	%state = ();	495	%state = ();
		496	$cb->(undef, { Status => 599, Reason => $_[2], @pseudo });
		497	},
		498	on_eof => sub {
		499	%state = ();
155	$cb->(undef, { Status => 599, Reason => "unexpected end-of-file" });	500	$cb->(undef, { Status => 599, Reason => "Unexpected end-of-file", @pseudo });
156	});	501	},
157
158	# send request
159	$state{handle}->push_write (
160	"\U$method\E $path HTTP/1.0\015\012"
161	. (join "", map "$_: $hdr{$_}\015\012", keys %hdr)
162	. "\015\012"
163	. (delete $state{body})
164	);
165
166	%hdr = (); # reduce memory usage, save a kitten
167
168	# status line
169	$state{handle}->push_read (line => qr/\015?\012/, sub {
170	$_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) \s+ ([^\015\012]+)/ix
171	or return (%state = (), $cb->(undef, { Status => 599, Reason => "invalid server response ($_[1])" }));
172
173	my %hdr = ( # response headers
174	HTTPVersion => ",$1",
175	Status => ",$2",
176	Reason => ",$3",
177	);	502	;
178		503
179	# headers, could be optimized a bit	504	# limit the number of persistent connections
180	$state{handle}->unshift_read (line => qr/\015?\012\015?\012/, sub {	505	# keepalive not yet supported
181	for ("$_[1]\012") {	506	# if ($KA_COUNT{$_[1]} < $MAX_PERSISTENT_PER_HOST) {
182	$hdr{lc $1} .= ",$2"	507	# ++$KA_COUNT{$_[1]};
183	while /\G	508	# $state{handle}{ka_count_guard} = AnyEvent::Util::guard {
184	([^:\000-\040]+):	509	# --$KA_COUNT{$_[1]}
185	[\011\040]*
186	((?: [^\015\012]+ \| \015?\012[\011\040] )*)
187	\015?\012
188	/gxc;
189
190	/\G$/
191	or return $cb->(undef, { Status => 599, Reason => "garbled response headers" });
192	}	510	# };
		511	# $hdr{connection} = "keep-alive";
		512	# } else {
		513	delete $hdr{connection};
		514	# }
193		515
		516	$state{handle}->starttls ("connect") if $rscheme eq "https";
		517
		518	# handle actual, non-tunneled, request
		519	my $handle_actual_request = sub {
		520	$state{handle}->starttls ("connect") if $uscheme eq "https" && !exists $state{handle}{tls};
		521
		522	# send request
		523	$state{handle}->push_write (
		524	"$method $rpath HTTP/1.0\015\012"
		525	. (join "", map "\u$_: $hdr{$_}\015\012", grep defined $hdr{$_}, keys %hdr)
		526	. "\015\012"
		527	. (delete $arg{body})
		528	);
		529
		530	# return if error occured during push_write()
		531	return unless %state;
		532
		533	%hdr = (); # reduce memory usage, save a kitten, also make it possible to re-use
		534
		535	# status line and headers
		536	$state{handle}->push_read (line => $qr_nlnl, sub {
		537	for ("$_[1]") {
		538	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
		539
		540	/^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )? \015?\012/igxc
		541	or return (%state = (), $cb->(undef, { Status => 599, Reason => "Invalid server response", @pseudo }));
		542
		543	push @pseudo,
		544	HTTPVersion => $1,
		545	Status => $2,
		546	Reason => $3,
		547	;
		548
		549	# things seen, not parsed:
		550	# p3pP="NON CUR OTPi OUR NOR UNI"
		551
		552	$hdr{lc $1} .= ",$2"
		553	while /\G
		554	([^:\000-\037]*):
		555	[\011\040]*
		556	((?: [^\012]+ \| \012[\011\040] )*)
		557	\012
		558	/gxc;
		559
		560	/\G$/
		561	or return (%state = (), $cb->(undef, { Status => 599, Reason => "Garbled response headers", @pseudo }));
		562	}
		563
		564	# remove the "," prefix we added to all headers above
194	substr $_, 0, 1, ""	565	substr $_, 0, 1, ""
195	for values %hdr;	566	for values %hdr;
196		567
197	if (exists $hdr{"content-length"}) {	568	# patch in all pseudo headers
198	$_[0]->unshift_read (chunk => $hdr{"content-length"}, sub {	569	%hdr = (%hdr, @pseudo);
199	# could cache persistent connection now	570
200	if ($hdr{connection} =~ /\bkeep-alive\b/i) {	571	# redirect handling
		572	# microsoft and other shitheads don't give a shit for following standards,
		573	# try to support some common forms of broken Location headers.
		574	if ($hdr{location} !~ /^(?: $ \| [^:\/?\#]+ : )/x) {
		575	$hdr{location} =~ s/^\.\/+//;
		576
		577	my $url = "$rscheme://$uhost:$uport";
		578
		579	unless ($hdr{location} =~ s/^\///) {
		580	$url .= $upath;
		581	$url =~ s/\/[^\/]*$//;
		582	}
		583
		584	$hdr{location} = "$url/$hdr{location}";
		585	}
		586
		587	my $redirect;
		588
		589	if ($recurse) {
		590	my $status = $hdr{Status};
		591
		592	# industry standard is to redirect POST as GET for
		593	# 301, 302 and 303, in contrast to http/1.0 and 1.1.
		594	# also, the UA should ask the user for 301 and 307 and POST,
		595	# industry standard seems to be to simply follow.
		596	# we go with the industry standard.
		597	if ($status == 301 or $status == 302 or $status == 303) {
		598	# HTTP/1.1 is unclear on how to mutate the method
		599	$method = "GET" unless $method eq "HEAD";
		600	$redirect = 1;
		601	} elsif ($status == 307) {
		602	$redirect = 1;
		603	}
		604	}
		605
		606	my $finish = sub {
		607	$state{handle}->destroy if $state{handle};
		608	%state = ();
		609
		610	# set-cookie processing
		611	if ($arg{cookie_jar}) {
		612	for ($_[1]{"set-cookie"}) {
		613	# parse NAME=VALUE
		614	my @kv;
		615
		616	while (/\G\s* ([^=;,[:space:]]+) \s=\s (?: "((?:[^\\"]+\|\\.))" \| ([^=;,[:space:]]) )/gcxs) {
		617	my $name = $1;
		618	my $value = $3;
		619
		620	unless ($value) {
		621	$value = $2;
		622	$value =~ s/\\(.)/$1/gs;
		623	}
		624
		625	push @kv, $name => $value;
		626
		627	last unless /\G\s*;/gc;
		628	}
		629
		630	last unless @kv;
		631
		632	my $name = shift @kv;
		633	my %kv = (value => shift @kv, @kv);
		634
		635	my $cdom;
		636	my $cpath = (delete $kv{path}) \|\| "/";
		637
		638	if (exists $kv{domain}) {
		639	$cdom = delete $kv{domain};
		640
		641	$cdom =~ s/^\.?/./; # make sure it starts with a "."
		642
		643	next if $cdom =~ /\.$/;
		644
		645	# this is not rfc-like and not netscape-like. go figure.
		646	my $ndots = $cdom =~ y/.//;
		647	next if $ndots < ($cdom =~ /\.[^.][^.]\.[^.][^.]$/ ? 3 : 2);
		648	} else {
		649	$cdom = $uhost;
		650	}
		651
		652	# store it
		653	$arg{cookie_jar}{version} = 1;
		654	$arg{cookie_jar}{$cdom}{$cpath}{$name} = \%kv;
		655
		656	redo if /\G\s*,/gc;
		657	}
		658	}
		659
		660	if ($redirect && exists $hdr{location}) {
		661	# we ignore any errors, as it is very common to receive
		662	# Content-Length != 0 but no actual body
		663	# we also access %hdr, as $_[1] might be an erro
		664	http_request (
		665	$method => $hdr{location},
		666	%arg,
		667	recurse => $recurse - 1,
		668	Redirect => \@_,
		669	$cb);
		670	} else {
		671	$cb->($_[0], $_[1]);
		672	}
201	};	673	};
202		674
		675	my $len = $hdr{"content-length"};
		676
		677	if (!$redirect && $arg{on_header} && !$arg{on_header}(\%hdr)) {
		678	$finish->(undef, { Status => 598, Reason => "Request cancelled by on_header", @pseudo });
		679	} elsif (
		680	$hdr{Status} =~ /^(?:1..\|[23]04)$/
		681	or $method eq "HEAD"
		682	or (defined $len && !$len)
		683	) {
		684	# no body
		685	$finish->("", \%hdr);
		686	} else {
		687	# body handling, four different code paths
		688	# for want_body_handle, on_body (2x), normal (2x)
		689	# we might read too much here, but it does not matter yet (no pers. connections)
		690	if (!$redirect && $arg{want_body_handle}) {
		691	$_[0]->on_eof (undef);
		692	$_[0]->on_error (undef);
		693	$_[0]->on_read (undef);
		694
		695	$finish->(delete $state{handle}, \%hdr);
		696
		697	} elsif ($arg{on_body}) {
		698	$_[0]->on_error (sub { $finish->(undef, { Status => 599, Reason => $_[2], @pseudo }) });
		699	if ($len) {
		700	$_[0]->on_eof (undef);
		701	$_[0]->on_read (sub {
		702	$len -= length $_[0]{rbuf};
		703
		704	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
		705	or $finish->(undef, { Status => 598, Reason => "Request cancelled by on_body", @pseudo });
		706
		707	$len > 0
		708	or $finish->("", \%hdr);
		709	});
		710	} else {
		711	$_[0]->on_eof (sub {
		712	$finish->("", \%hdr);
		713	});
		714	$_[0]->on_read (sub {
		715	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
		716	or $finish->(undef, { Status => 598, Reason => "Request cancelled by on_body", @pseudo });
		717	});
		718	}
		719	} else {
		720	$_[0]->on_eof (undef);
		721
		722	if ($len) {
		723	$_[0]->on_error (sub { $finish->(undef, { Status => 599, Reason => $_[2], @pseudo }) });
		724	$_[0]->on_read (sub {
		725	$finish->((substr delete $_[0]{rbuf}, 0, $len, ""), \%hdr)
		726	if $len <= length $_[0]{rbuf};
		727	});
		728	} else {
		729	$_[0]->on_error (sub {
		730	($! == Errno::EPIPE \|\| !$!)
		731	? $finish->(delete $_[0]{rbuf}, \%hdr)
		732	: $finish->(undef, { Status => 599, Reason => $_[2], @pseudo });
		733	});
		734	$_[0]->on_read (sub { });
		735	}
		736	}
		737	}
		738	});
		739	};
		740
		741	# now handle proxy-CONNECT method
		742	if ($proxy && $uscheme eq "https") {
		743	# oh dear, we have to wrap it into a connect request
		744
		745	# maybe re-use $uauthority with patched port?
		746	$state{handle}->push_write ("CONNECT $uhost:$uport HTTP/1.0\015\012Host: $uhost\015\012\015\012");
		747	$state{handle}->push_read (line => $qr_nlnl, sub {
		748	$_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )?/ix
		749	or return (%state = (), $cb->(undef, { Status => 599, Reason => "Invalid proxy connect response ($_[1])", @pseudo }));
		750
		751	if ($2 == 200) {
		752	$rpath = $upath;
		753	&$handle_actual_request;
		754	} else {
203	%state = ();	755	%state = ();
204	$cb->($_[1], \%hdr);	756	$cb->(undef, { Status => $2, Reason => $3, @pseudo });
		757	}
205	});	758	});
206	} else {	759	} else {
207	# too bad, need to read until we get an error or EOF,	760	&$handle_actual_request;
208	# no way to detect winged data.
209	$_[0]->on_error (sub {
210	%state = ();
211	$cb->($_[0]{rbuf}, \%hdr);
212	});
213	$_[0]->on_eof (undef);
214	$_[0]->on_read (sub { });
215	}	761	}
		762
216	});	763	},
		764	$arg{on_prepare} \|\| sub { $timeout }
217	});	765	);
218	}, sub {
219	$timeout
220	};	766	};
221		767
222	defined wantarray && AnyEvent::Util::guard { %state = () }	768	defined wantarray && AnyEvent::Util::guard { %state = () }
223	}	769	}
224		770
225	sub http_get($$;@) {	771	sub http_get($@) {
226	unshift @_, "GET";	772	unshift @_, "GET";
227	&http_request	773	&http_request
228	}	774	}
229		775
		776	sub http_head($@) {
		777	unshift @_, "HEAD";
		778	&http_request
		779	}
		780
		781	sub http_post($$@) {
		782	my $url = shift;
		783	unshift @_, "POST", $url, "body";
		784	&http_request
		785	}
		786
		787	=back
		788
		789	=head2 DNS CACHING
		790
		791	AnyEvent::HTTP uses the AnyEvent::Socket::tcp_connect function for
		792	the actual connection, which in turn uses AnyEvent::DNS to resolve
		793	hostnames. The latter is a simple stub resolver and does no caching
		794	on its own. If you want DNS caching, you currently have to provide
		795	your own default resolver (by storing a suitable resolver object in
		796	C<$AnyEvent::DNS::RESOLVER>).
		797
230	=head2 GLOBAL VARIABLES	798	=head2 GLOBAL FUNCTIONS AND VARIABLES
231		799
232	=over 4	800	=over 4
233		801
		802	=item AnyEvent::HTTP::set_proxy "proxy-url"
		803
		804	Sets the default proxy server to use. The proxy-url must begin with a
		805	string of the form C<http://host:port> (optionally C<https:...>), croaks
		806	otherwise.
		807
		808	To clear an already-set proxy, use C<undef>.
		809
234	=item $AnyEvent::HTTP::MAX_REDIRECTS	810	=item $AnyEvent::HTTP::MAX_RECURSE
235		811
236	The default value for the C<max_redirects> request parameter	812	The default value for the C<recurse> request parameter (default: C<10>).
237	(default: C<10>).
238		813
239	=item $AnyEvent::HTTP::USERAGENT	814	=item $AnyEvent::HTTP::USERAGENT
240		815
241	The default value for the C<User-Agent> header (the default is	816	The default value for the C<User-Agent> header (the default is
242	C<Mozilla/5.0 (compatible; AnyEvent::HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)>).	817	C<Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)>).
243		818
244	=item $AnyEvent::HTTP::MAX_PERSISTENT	819	=item $AnyEvent::HTTP::MAX_PER_HOST
245		820
246	The maximum number of persistent connections to keep open (default: 8).	821	The maximum number of concurrent connections to the same host (identified
		822	by the hostname). If the limit is exceeded, then the additional requests
		823	are queued until previous connections are closed.
247		824
248	=item $AnyEvent::HTTP::PERSISTENT_TIMEOUT	825	The default value for this is C<4>, and it is highly advisable to not
		826	increase it.
249		827
250	The maximum time to cache a persistent connection, in seconds (default: 15).	828	=item $AnyEvent::HTTP::ACTIVE
		829
		830	The number of active connections. This is not the number of currently
		831	running requests, but the number of currently open and non-idle TCP
		832	connections. This number of can be useful for load-leveling.
251		833
252	=back	834	=back
253		835
254	=cut	836	=cut
255		837
		838	sub set_proxy($) {
		839	if (length $_[0]) {
		840	$_[0] =~ m%^(https?):// ([^:/]+) (?: : (\d*) )?%ix
		841	or Carp::croak "$_[0]: invalid proxy URL";
		842	$PROXY = [$2, $3 \|\| 3128, $1]
		843	} else {
		844	undef $PROXY;
		845	}
		846	}
		847
		848	# initialise proxy from environment
		849	eval {
		850	set_proxy $ENV{http_proxy};
		851	};
		852
256	=head1 SEE ALSO	853	=head1 SEE ALSO
257		854
258	L<AnyEvent>.	855	L<AnyEvent>.
259		856
260	=head1 AUTHOR	857	=head1 AUTHOR
261		858
262	Marc Lehmann <schmorp@schmorp.de>	859	Marc Lehmann <schmorp@schmorp.de>
263	http://home.schmorp.de/	860	http://home.schmorp.de/
		861
		862	With many thanks to Дмитрий Шалашов, who provided countless
		863	testcases and bugreports.
264		864
265	=cut	865	=cut
266		866
267	1	867	1
268		868

Diff Legend

-–
+Removed lines
-+
+Added lines
-<
+Changed lines
->
+Changed lines

Comparing AnyEvent-HTTP/HTTP.pm (file contents): Revision 1.1 by root, Tue Jun 3 16:37:13 2008 UTC vs. Revision 1.59 by root, Wed Dec 29 23:59:36 2010 UTC

Diff Legend

Comparing AnyEvent-HTTP/HTTP.pm (file contents):
Revision 1.1 by root, Tue Jun 3 16:37:13 2008 UTC vs.
Revision 1.59 by root, Wed Dec 29 23:59:36 2010 UTC