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

Comparing AnyEvent-HTTP/HTTP.pm (file contents):
Revision 1.2 by root, Wed Jun 4 11:37:41 2008 UTC vs.
Revision 1.62 by root, Thu Dec 30 04:30:24 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 $USERAGENT = "Mozilla/5.0 (compatible; AnyEvent::HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)";	56	our $USERAGENT = "Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)";
39	our $MAX_REDIRECTS = 10;	57	our $MAX_RECURSE = 10;
40	our $MAX_PERSISTENT = 8;	58	our $MAX_PERSISTENT = 8;
41	our $PERSISTENT_TIMEOUT = 2;	59	our $PERSISTENT_TIMEOUT = 2;
42	our $TIMEOUT = 300;	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;
47		65
48	our $PROXY;	66	our $PROXY;
		67	our $ACTIVE = 0;
49		68
50	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
51		71
52	=item http_get $url, key => value..., $cb->($data, $headers)	72	=item http_get $url, key => value..., $cb->($data, $headers)
53		73
54	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
55	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.
56		87
57	=item http_request $method => $url, key => value..., $cb->($data, $headers)	88	=item http_request $method => $url, key => value..., $cb->($data, $headers)
58		89
59	Executes a HTTP request of type C<$method> (e.g. C<GET>, C<POST>). The URL	90	Executes a HTTP request of type C<$method> (e.g. C<GET>, C<POST>). The URL
60	must be an absolute http or https URL.	91	must be an absolute http or https URL.
61		92
		93	When called in void context, nothing is returned. In other contexts,
		94	C<http_request> returns a "cancellation guard" - you have to keep the
		95	object at least alive until the callback get called. If the object gets
		96	destroyed before the callback is called, the request will be cancelled.
		97
62	The callback will be called with the response data as first argument	98	The callback will be called with the response body data as first argument
63	(or C<undef> if it wasn't available due to errors), and a hash-ref with	99	(or C<undef> if an error occured), and a hash-ref with response headers as
64	response headers as second argument.	100	second argument.
65		101
66	All the headers in that has are lowercased. In addition to the response	102	All the headers in that hash are lowercased. In addition to the response
67	headers, the three "pseudo-headers" C<HTTPVersion>, C<Status> and	103	headers, the "pseudo-headers" (uppercase to avoid clashing with possible
		104	response headers) C<HTTPVersion>, C<Status> and C<Reason> contain the
68	C<Reason> contain the three parts of the HTTP Status-Line of the same	105	three parts of the HTTP Status-Line of the same name.
69	name.	106
		107	The pseudo-header C<URL> contains the actual URL (which can differ from
		108	the requested URL when following redirects - for example, you might get
		109	an error that your URL scheme is not supported even though your URL is a
		110	valid http URL because it redirected to an ftp URL, in which case you can
		111	look at the URL pseudo header).
		112
		113	The pseudo-header C<Redirect> only exists when the request was a result
		114	of an internal redirect. In that case it is an array reference with
		115	the C<($data, $headers)> from the redirect response. Note that this
		116	response could in turn be the result of a redirect itself, and C<<
		117	$headers->{Redirect}[1]{Redirect} >> will then contain the original
		118	response, and so on.
		119
		120	If the server sends a header multiple times, then their contents will be
		121	joined together with a comma (C<,>), as per the HTTP spec.
70		122
71	If an internal error occurs, such as not being able to resolve a hostname,	123	If an internal error occurs, such as not being able to resolve a hostname,
72	then C<$data> will be C<undef>, C<< $headers->{Status} >> will be C<599>	124	then C<$data> will be C<undef>, C<< $headers->{Status} >> will be C<59x>
73	and the C<Reason> pseudo-header will contain an error message.	125	(usually C<599>) and the C<Reason> pseudo-header will contain an error
		126	message.
		127
		128	A typical callback might look like this:
		129
		130	sub {
		131	my ($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	}
74		139
75	Additional parameters are key-value pairs, and are fully optional. They	140	Additional parameters are key-value pairs, and are fully optional. They
76	include:	141	include:
77		142
78	=over 4	143	=over 4
79		144
80	=item recurse => $boolean (default: true)	145	=item recurse => $count (default: $MAX_RECURSE)
81		146
82	Whether to recurse requests or not, e.g. on redirects, authentication	147	Whether to recurse requests or not, e.g. on redirects, authentication
83	retries and so on.	148	retries and so on, and how often to do so.
84		149
85	=item headers => hashref	150	=item headers => hashref
86		151
87	The request headers to use.	152	The request headers to use, with the header name (I<MUST be in lowercase>)
		153	as key and header value as hash value.
		154
		155	Currently, http_request> may provide its own C<host>, C<content-length>,
		156	C<connection> and C<cookie> headers and will provide defaults for
		157	C<user-agent> and C<referer> (this can be suppressed by using a value of
		158	C<undef> for these headers in which case they won't be sent at all).
88		159
89	=item timeout => $seconds	160	=item timeout => $seconds
90		161
91	The time-out to use for various stages - each connect attempt will reset	162	The time-out to use for various stages - each connect attempt will reset
92	the timeout, as will read or write activity. Default timeout is 5 minutes.	163	the timeout, as will read or write activity, i.e. this is not an overall
		164	timeout.
		165
		166	Default timeout is 5 minutes.
93		167
94	=item proxy => [$host, $port[, $scheme]] or undef	168	=item proxy => [$host, $port[, $scheme]] or undef
95		169
96	Use the given http proxy for all requests. If not specified, then the	170	Use the given http proxy for all requests. If not specified, then the
97	default proxy (as specified by C<$ENV{http_proxy}>) is used.	171	default proxy (as specified by C<$ENV{http_proxy}>) is used.
98		172
99	C<$scheme> must be either missing or C<http> for HTTP, or C<https> for	173	C<$scheme> must be either missing, C<http> for HTTP or C<https> for
100	HTTPS.	174	HTTPS.
101		175
		176	=item body => $string
		177
		178	The request body, usually empty. Will be-sent as-is (future versions of
		179	this module might offer more options).
		180
		181	=item cookie_jar => $hash_ref
		182
		183	Passing this parameter enables (simplified) cookie-processing, loosely
		184	based on the original netscape specification.
		185
		186	The C<$hash_ref> must be an (initially empty) hash reference which will
		187	get updated automatically. It is possible to save the cookie_jar to
		188	persistent storage with something like JSON or Storable, but this is not
		189	recommended, as expiry times are currently being ignored.
		190
		191	Note that this cookie implementation is not of very high quality, nor
		192	meant to be complete. If you want complete cookie management you have to
		193	do that on your own. C<cookie_jar> is meant as a quick fix to get some
		194	cookie-using sites working. Cookies are a privacy disaster, do not use
		195	them unless required to.
		196
		197	=item tls_ctx => $scheme \| $tls_ctx
		198
		199	Specifies the AnyEvent::TLS context to be used for https connections. This
		200	parameter follows the same rules as the C<tls_ctx> parameter to
		201	L<AnyEvent::Handle>, but additionally, the two strings C<low> or
		202	C<high> can be specified, which give you a predefined low-security (no
		203	verification, highest compatibility) and high-security (CA and common-name
		204	verification) TLS context.
		205
		206	The default for this option is C<low>, which could be interpreted as "give
		207	me the page, no matter what".
		208
		209	=item on_prepare => $callback->($fh)
		210
		211	In rare cases you need to "tune" the socket before it is used to
		212	connect (for exmaple, to bind it on a given IP address). This parameter
		213	overrides the prepare callback passed to C<AnyEvent::Socket::tcp_connect>
		214	and behaves exactly the same way (e.g. it has to provide a
		215	timeout). See the description for the C<$prepare_cb> argument of
		216	C<AnyEvent::Socket::tcp_connect> for details.
		217
		218	=item tcp_connect => $callback->($host, $service, $connect_cb, $prepare_cb)
		219
		220	In even rarer cases you want total control over how AnyEvent::HTTP
		221	establishes connections. Normally it uses L<AnyEvent::Socket::tcp_connect>
		222	to do this, but you can provide your own C<tcp_connect> function -
		223	obviously, it has to follow the same calling conventions, except that it
		224	may always return a connection guard object.
		225
		226	There are probably lots of weird uses for this function, starting from
		227	tracing the hosts C<http_request> actually tries to connect, to (inexact
		228	but fast) host => IP address caching or even socks protocol support.
		229
		230	=item on_header => $callback->($headers)
		231
		232	When specified, this callback will be called with the header hash as soon
		233	as headers have been successfully received from the remote server (not on
		234	locally-generated errors).
		235
		236	It has to return either true (in which case AnyEvent::HTTP will continue),
		237	or false, in which case AnyEvent::HTTP will cancel the download (and call
		238	the finish callback with an error code of C<598>).
		239
		240	This callback is useful, among other things, to quickly reject unwanted
		241	content, which, if it is supposed to be rare, can be faster than first
		242	doing a C<HEAD> request.
		243
		244	Example: cancel the request unless the content-type is "text/html".
		245
		246	on_header => sub {
		247	$_[0]{"content-type"} =~ /^text\/html\s*(?:;\|$)/
		248	},
		249
		250	=item on_body => $callback->($partial_body, $headers)
		251
		252	When specified, all body data will be passed to this callback instead of
		253	to the completion callback. The completion callback will get the empty
		254	string instead of the body data.
		255
		256	It has to return either true (in which case AnyEvent::HTTP will continue),
		257	or false, in which case AnyEvent::HTTP will cancel the download (and call
		258	the completion callback with an error code of C<598>).
		259
		260	This callback is useful when the data is too large to be held in memory
		261	(so the callback writes it to a file) or when only some information should
		262	be extracted, or when the body should be processed incrementally.
		263
		264	It is usually preferred over doing your own body handling via
		265	C<want_body_handle>, but in case of streaming APIs, where HTTP is
		266	only used to create a connection, C<want_body_handle> is the better
		267	alternative, as it allows you to install your own event handler, reducing
		268	resource usage.
		269
		270	=item want_body_handle => $enable
		271
		272	When enabled (default is disabled), the behaviour of AnyEvent::HTTP
		273	changes considerably: after parsing the headers, and instead of
		274	downloading the body (if any), the completion callback will be
		275	called. Instead of the C<$body> argument containing the body data, the
		276	callback will receive the L<AnyEvent::Handle> object associated with the
		277	connection. In error cases, C<undef> will be passed. When there is no body
		278	(e.g. status C<304>), the empty string will be passed.
		279
		280	The handle object might or might not be in TLS mode, might be connected to
		281	a proxy, be a persistent connection etc., and configured in unspecified
		282	ways. The user is responsible for this handle (it will not be used by this
		283	module anymore).
		284
		285	This is useful with some push-type services, where, after the initial
		286	headers, an interactive protocol is used (typical example would be the
		287	push-style twitter API which starts a JSON/XML stream).
		288
		289	If you think you need this, first have a look at C<on_body>, to see if
		290	that doesn't solve your problem in a better way.
		291
102	=back	292	=back
103		293
104	=back	294	Example: make a simple HTTP GET request for http://www.nethype.de/
		295
		296	http_request GET => "http://www.nethype.de/", sub {
		297	my ($body, $hdr) = @_;
		298	print "$body\n";
		299	};
		300
		301	Example: make a HTTP HEAD request on https://www.google.com/, use a
		302	timeout of 30 seconds.
		303
		304	http_request
		305	GET => "https://www.google.com",
		306	timeout => 30,
		307	sub {
		308	my ($body, $hdr) = @_;
		309	use Data::Dumper;
		310	print Dumper $hdr;
		311	}
		312	;
		313
		314	Example: make another simple HTTP GET request, but immediately try to
		315	cancel it.
		316
		317	my $request = http_request GET => "http://www.nethype.de/", sub {
		318	my ($body, $hdr) = @_;
		319	print "$body\n";
		320	};
		321
		322	undef $request;
105		323
106	=cut	324	=cut
107		325
		326	sub _slot_schedule;
		327	sub _slot_schedule($) {
		328	my $host = shift;
		329
		330	while ($CO_SLOT{$host}[0] < $MAX_PER_HOST) {
		331	if (my $cb = shift @{ $CO_SLOT{$host}[1] }) {
		332	# somebody wants that slot
		333	++$CO_SLOT{$host}[0];
		334	++$ACTIVE;
		335
		336	$cb->(AnyEvent::Util::guard {
		337	--$ACTIVE;
		338	--$CO_SLOT{$host}[0];
		339	_slot_schedule $host;
		340	});
		341	} else {
		342	# nobody wants the slot, maybe we can forget about it
		343	delete $CO_SLOT{$host} unless $CO_SLOT{$host}[0];
		344	last;
		345	}
		346	}
		347	}
		348
		349	# wait for a free slot on host, call callback
		350	sub _get_slot($$) {
		351	push @{ $CO_SLOT{$_[0]}[1] }, $_[1];
		352
		353	_slot_schedule $_[0];
		354	}
		355
		356	our $qr_nlnl = qr{(?<![^\012])\015?\012};
		357
		358	our $TLS_CTX_LOW = { cache => 1, sslv2 => 1 };
		359	our $TLS_CTX_HIGH = { cache => 1, verify => 1, verify_peername => "https" };
		360
108	sub http_request($$$;@) {	361	sub http_request($$@) {
109	my $cb = pop;	362	my $cb = pop;
110	my ($method, $url, %arg) = @_;	363	my ($method, $url, %arg) = @_;
111		364
112	my %hdr;	365	my %hdr;
113		366
		367	$arg{tls_ctx} = $TLS_CTX_LOW if $arg{tls_ctx} eq "low" \|\| !exists $arg{tls_ctx};
		368	$arg{tls_ctx} = $TLS_CTX_HIGH if $arg{tls_ctx} eq "high";
		369
		370	$method = uc $method;
		371
114	if (my $hdr = delete $arg{headers}) {	372	if (my $hdr = $arg{headers}) {
115	while (my ($k, $v) = each %$hdr) {	373	while (my ($k, $v) = each %$hdr) {
116	$hdr{lc $k} = $v;	374	$hdr{lc $k} = $v;
117	}	375	}
118	}	376	}
119		377
		378	# pseudo headers for all subsequent responses
		379	my @pseudo = (URL => $url);
		380	push @pseudo, Redirect => delete $arg{Redirect} if exists $arg{Redirect};
		381
		382	my $recurse = exists $arg{recurse} ? delete $arg{recurse} : $MAX_RECURSE;
		383
		384	return $cb->(undef, { Status => 599, Reason => "Too many redirections", @pseudo })
		385	if $recurse < 0;
		386
120	my $proxy = $arg{proxy} \|\| $PROXY;	387	my $proxy = $arg{proxy} \|\| $PROXY;
121	my $timeout = $arg{timeout} \|\| $TIMEOUT;	388	my $timeout = $arg{timeout} \|\| $TIMEOUT;
122		389
123	$hdr{"user-agent"} \|\|= $USERAGENT;	390	my ($uscheme, $uauthority, $upath, $query, $fragment) =
		391	$url =~ m\|(?:([^:/?#]+):)?(?://([^/?#]))?([^?#])(?:(\?[^#]))?(?:#(.))?\|;
124		392
125	my ($host, $port, $path, $scheme);	393	$uscheme = lc $uscheme;
		394
		395	my $uport = $uscheme eq "http" ? 80
		396	: $uscheme eq "https" ? 443
		397	: return $cb->(undef, { Status => 599, Reason => "Only http and https URL schemes supported", @pseudo });
		398
		399	$uauthority =~ /^(?: .*\@ )? ([^\@:]+) (?: : (\d+) )?$/x
		400	or return $cb->(undef, { Status => 599, Reason => "Unparsable URL", @pseudo });
		401
		402	my $uhost = $1;
		403	$uport = $2 if defined $2;
		404
		405	$hdr{host} = defined $2 ? "$uhost:$2" : "$uhost"
		406	unless exists $hdr{host};
		407
		408	$uhost =~ s/^\[(.*)\]$/$1/;
		409	$upath .= $query if length $query;
		410
		411	$upath =~ s%^/?%/%;
		412
		413	# cookie processing
		414	if (my $jar = $arg{cookie_jar}) {
		415	%$jar = () if $jar->{version} != 1;
		416
		417	my @cookie;
		418
		419	while (my ($chost, $v) = each %$jar) {
		420	if ($chost =~ /^\./) {
		421	next unless $chost eq substr $uhost, -length $chost;
		422	} elsif ($chost =~ /\./) {
		423	next unless $chost eq $uhost;
		424	} else {
		425	next;
		426	}
		427
		428	while (my ($cpath, $v) = each %$v) {
		429	next unless $cpath eq substr $upath, 0, length $cpath;
		430
		431	while (my ($k, $v) = each %$v) {
		432	next if $uscheme ne "https" && exists $v->{secure};
		433	my $value = $v->{value};
		434	$value =~ s/([\\"])/\\$1/g;
		435	push @cookie, "$k=\"$value\"";
		436	}
		437	}
		438	}
		439
		440	$hdr{cookie} = join "; ", @cookie
		441	if @cookie;
		442	}
		443
		444	my ($rhost, $rport, $rscheme, $rpath); # request host, port, path
126		445
127	if ($proxy) {	446	if ($proxy) {
128	($host, $port, $scheme) = @$proxy;	447	($rpath, $rhost, $rport, $rscheme) = ($url, @$proxy);
129	$path = $url;	448
		449	$rscheme = "http" unless defined $rscheme;
		450
		451	# don't support https requests over https-proxy transport,
		452	# can't be done with tls as spec'ed, unless you double-encrypt.
		453	$rscheme = "http" if $uscheme eq "https" && $rscheme eq "https";
130	} else {	454	} else {
131	($scheme, my $authority, $path, my $query, my $fragment) =	455	($rhost, $rport, $rscheme, $rpath) = ($uhost, $uport, $uscheme, $upath);
132	$url =~ m\|(?:([^:/?#]+):)?(?://([^/?#]))?([^?#])(?:\?([^#]))?(?:#(.))?\|;
133
134	$port = $scheme eq "http" ? 80
135	: $scheme eq "https" ? 443
136	: croak "$url: only http and https URLs supported";
137
138	$authority =~ /^(?: .*\@ )? ([^\@:]+) (?: : (\d+) )?$/x
139	or croak "$authority: unparsable URL";
140
141	$host = $1;
142	$port = $2 if defined $2;
143
144	$host =~ s/^\[(.*)\]$/$1/;
145	$path .= "?$query" if length $query;
146
147	$path = "/" unless $path;
148
149	$hdr{host} = $host = lc $host;
150	}	456	}
151		457
152	$scheme = lc $scheme;	458	# leave out fragment and query string, just a heuristic
		459	$hdr{referer} \|\|= "$uscheme://$uauthority$upath" unless exists $hdr{referer};
		460	$hdr{"user-agent"} \|\|= $USERAGENT unless exists $hdr{"user-agent"};
153		461
154	my %state;
155
156	my $body = "";
157	$state{body} = $body;
158
159	$hdr{"content-length"} = length $body;	462	$hdr{"content-length"} = length $arg{body}
		463	if length $arg{body} \|\| $method ne "GET";
160		464
161	$state{connect_guard} = AnyEvent::Socket::tcp_connect $host, $port, sub {	465	my %state = (connect_guard => 1);
		466
		467	_get_slot $uhost, sub {
		468	$state{slot_guard} = shift;
		469
		470	return unless $state{connect_guard};
		471
		472	my $tcp_connect = $arg{tcp_connect}
		473	\|\| do { require AnyEvent::Socket; \&AnyEvent::Socket::tcp_connect };
		474
		475	$state{connect_guard} = $tcp_connect->(
		476	$rhost,
		477	$rport,
		478	sub {
162	$state{fh} = shift	479	$state{fh} = shift
		480	or do {
		481	my $err = "$!";
		482	%state = ();
163	or return $cb->(undef, { Status => 599, Reason => "$!" });	483	return $cb->(undef, { Status => 599, Reason => $err, @pseudo });
		484	};
164		485
165	delete $state{connect_guard}; # reduce memory usage, save a tree	486	pop; # free memory, save a tree
166		487
		488	return unless delete $state{connect_guard};
		489
167	# get handle	490	# get handle
168	$state{handle} = new AnyEvent::Handle	491	$state{handle} = new AnyEvent::Handle
169	fh => $state{fh},	492	fh => $state{fh},
170	($scheme eq "https" ? (tls => "connect") : ());	493	peername => $rhost,
		494	tls_ctx => $arg{tls_ctx},
		495	# these need to be reconfigured on keepalive handles
		496	timeout => $timeout,
		497	on_error => sub {
		498	%state = ();
		499	$cb->(undef, { Status => 599, Reason => $_[2], @pseudo });
		500	},
		501	on_eof => sub {
		502	%state = ();
		503	$cb->(undef, { Status => 599, Reason => "Unexpected end-of-file", @pseudo });
		504	},
		505	;
171		506
172	# limit the number of persistent connections	507	# limit the number of persistent connections
		508	# keepalive not yet supported
173	if ($KA_COUNT{$_[1]} < $MAX_PERSISTENT_PER_HOST) {	509	# if ($KA_COUNT{$_[1]} < $MAX_PERSISTENT_PER_HOST) {
174	++$KA_COUNT{$_[1]};	510	# ++$KA_COUNT{$_[1]};
175	$state{handle}{ka_count_guard} = AnyEvent::Util::guard { --$KA_COUNT{$_[1]} };	511	# $state{handle}{ka_count_guard} = AnyEvent::Util::guard {
		512	# --$KA_COUNT{$_[1]}
		513	# };
176	$hdr{connection} = "keep-alive";	514	# $hdr{connection} = "keep-alive";
177	delete $hdr{connection}; # keep-alive not yet supported
178	} else {	515	# } else {
179	delete $hdr{connection};	516	delete $hdr{connection};
180	}	517	# }
181		518
182	# (re-)configure handle	519	$state{handle}->starttls ("connect") if $rscheme eq "https";
183	$state{handle}->timeout ($timeout);
184	$state{handle}->on_error (sub {
185	%state = ();
186	$cb->(undef, { Status => 599, Reason => "$!" });
187	});
188	$state{handle}->on_eof (sub {
189	%state = ();
190	$cb->(undef, { Status => 599, Reason => "unexpected end-of-file" });
191	});
192		520
		521	# handle actual, non-tunneled, request
		522	my $handle_actual_request = sub {
		523	$state{handle}->starttls ("connect") if $uscheme eq "https" && !exists $state{handle}{tls};
		524
193	# send request	525	# send request
194	$state{handle}->push_write (	526	$state{handle}->push_write (
195	"\U$method\E $path HTTP/1.0\015\012"	527	"$method $rpath HTTP/1.0\015\012"
196	. (join "", map "$_: $hdr{$_}\015\012", keys %hdr)	528	. (join "", map "\u$_: $hdr{$_}\015\012", grep defined $hdr{$_}, keys %hdr)
197	. "\015\012"	529	. "\015\012"
198	. (delete $state{body})	530	. (delete $arg{body})
199	);	531	);
200		532
201	%hdr = (); # reduce memory usage, save a kitten	533	# return if error occured during push_write()
		534	return unless %state;
202		535
203	# status line	536	%hdr = (); # reduce memory usage, save a kitten, also make it possible to re-use
		537
		538	# status line and headers
204	$state{handle}->push_read (line => qr/\015?\012/, sub {	539	$state{handle}->push_read (line => $qr_nlnl, sub {
		540	for ("$_[1]") {
		541	y/\015//d; # weed out any \015, as they show up in the weirdest of places.
		542
205	$_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) \s+ ([^\015\012]+)/ix	543	/^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )? \015?\012/igxc
206	or return (%state = (), $cb->(undef, { Status => 599, Reason => "invalid server response ($_[1])" }));	544	or return (%state = (), $cb->(undef, { Status => 599, Reason => "Invalid server response", @pseudo }));
207		545
208	my %hdr = ( # response headers	546	push @pseudo,
209	HTTPVersion => ",$1",	547	HTTPVersion => $1,
210	Status => ",$2",	548	Status => $2,
211	Reason => ",$3",	549	Reason => $3,
212	);	550	;
213		551
214	# headers, could be optimized a bit	552	# things seen, not parsed:
215	$state{handle}->unshift_read (line => qr/\015?\012\015?\012/, sub {	553	# p3pP="NON CUR OTPi OUR NOR UNI"
216	for ("$_[1]\012") {	554
217	# we support spaces in field names, as lotus domino
218	# creates them.
219	$hdr{lc $1} .= ",$2"	555	$hdr{lc $1} .= ",$2"
220	while /\G	556	while /\G
221	([^:\000-\037]+):	557	([^:\000-\037]*):
222	[\011\040]*	558	[\011\040]*
223	((?: [^\015\012]+ \| \015?\012[\011\040] )*)	559	((?: [^\012]+ \| \012[\011\040] )*)
224	\015?\012	560	\012
225	/gxc;	561	/gxc;
226		562
227	/\G$/	563	/\G$/
228	or return $cb->(undef, { Status => 599, Reason => "garbled response headers" });	564	or return (%state = (), $cb->(undef, { Status => 599, Reason => "Garbled response headers", @pseudo }));
229	}	565	}
230		566
		567	# remove the "," prefix we added to all headers above
231	substr $_, 0, 1, ""	568	substr $_, 0, 1, ""
232	for values %hdr;	569	for values %hdr;
233		570
234	if (exists $hdr{"content-length"}) {	571	# patch in all pseudo headers
235	$_[0]->unshift_read (chunk => $hdr{"content-length"}, sub {	572	%hdr = (%hdr, @pseudo);
236	# could cache persistent connection now	573
237	if ($hdr{connection} =~ /\bkeep-alive\b/i) {	574	# redirect handling
238	# but we don't, due to misdesigns, this is annoyingly complex	575	# microsoft and other shitheads don't give a shit for following standards,
		576	# try to support some common forms of broken Location headers.
		577	if ($hdr{location} !~ /^(?: $ \| [^:\/?\#]+ : )/x) {
		578	$hdr{location} =~ s/^\.\/+//;
		579
		580	my $url = "$rscheme://$uhost:$uport";
		581
		582	unless ($hdr{location} =~ s/^\///) {
		583	$url .= $upath;
		584	$url =~ s/\/[^\/]*$//;
		585	}
		586
		587	$hdr{location} = "$url/$hdr{location}";
		588	}
		589
		590	my $redirect;
		591
		592	if ($recurse) {
		593	my $status = $hdr{Status};
		594
		595	# industry standard is to redirect POST as GET for
		596	# 301, 302 and 303, in contrast to http/1.0 and 1.1.
		597	# also, the UA should ask the user for 301 and 307 and POST,
		598	# industry standard seems to be to simply follow.
		599	# we go with the industry standard.
		600	if ($status == 301 or $status == 302 or $status == 303) {
		601	# HTTP/1.1 is unclear on how to mutate the method
		602	$method = "GET" unless $method eq "HEAD";
		603	$redirect = 1;
		604	} elsif ($status == 307) {
		605	$redirect = 1;
		606	}
		607	}
		608
		609	my $finish = sub {
		610	$state{handle}->destroy if $state{handle};
		611	%state = ();
		612
		613	# set-cookie processing
		614	if ($arg{cookie_jar}) {
		615	for ($_[1]{"set-cookie"}) {
		616	# parse NAME=VALUE
		617	my @kv;
		618
		619	while (/\G\s* ([^=;,[:space:]]+) \s=\s (?: "((?:[^\\"]+\|\\.))" \| ([^=;,[:space:]]) )/gcxs) {
		620	my $name = $1;
		621	my $value = $3;
		622
		623	unless ($value) {
		624	$value = $2;
		625	$value =~ s/\\(.)/$1/gs;
		626	}
		627
		628	push @kv, $name => $value;
		629
		630	last unless /\G\s*;/gc;
		631	}
		632
		633	last unless @kv;
		634
		635	my $name = shift @kv;
		636	my %kv = (value => shift @kv, @kv);
		637
		638	my $cdom;
		639	my $cpath = (delete $kv{path}) \|\| "/";
		640
		641	if (exists $kv{domain}) {
		642	$cdom = delete $kv{domain};
		643
		644	$cdom =~ s/^\.?/./; # make sure it starts with a "."
		645
		646	next if $cdom =~ /\.$/;
		647
		648	# this is not rfc-like and not netscape-like. go figure.
		649	my $ndots = $cdom =~ y/.//;
		650	next if $ndots < ($cdom =~ /\.[^.][^.]\.[^.][^.]$/ ? 3 : 2);
		651	} else {
		652	$cdom = $uhost;
		653	}
		654
		655	# store it
		656	$arg{cookie_jar}{version} = 1;
		657	$arg{cookie_jar}{$cdom}{$cpath}{$name} = \%kv;
		658
		659	redo if /\G\s*,/gc;
		660	}
		661	}
		662
		663	if ($redirect && exists $hdr{location}) {
		664	# we ignore any errors, as it is very common to receive
		665	# Content-Length != 0 but no actual body
		666	# we also access %hdr, as $_[1] might be an erro
		667	http_request (
		668	$method => $hdr{location},
		669	%arg,
		670	recurse => $recurse - 1,
		671	Redirect => \@_,
		672	$cb);
		673	} else {
		674	$cb->($_[0], $_[1]);
		675	}
239	};	676	};
240		677
		678	my $len = $hdr{"content-length"};
		679
		680	if (!$redirect && $arg{on_header} && !$arg{on_header}(\%hdr)) {
		681	$finish->(undef, { Status => 598, Reason => "Request cancelled by on_header", @pseudo });
		682	} elsif (
		683	$hdr{Status} =~ /^(?:1..\|[23]04)$/
		684	or $method eq "HEAD"
		685	or (defined $len && !$len)
		686	) {
		687	# no body
		688	$finish->("", \%hdr);
		689	} else {
		690	# body handling, four different code paths
		691	# for want_body_handle, on_body (2x), normal (2x)
		692	# we might read too much here, but it does not matter yet (no pers. connections)
		693	if (!$redirect && $arg{want_body_handle}) {
		694	$_[0]->on_eof (undef);
		695	$_[0]->on_error (undef);
		696	$_[0]->on_read (undef);
		697
		698	$finish->(delete $state{handle}, \%hdr);
		699
		700	} elsif ($arg{on_body}) {
		701	$_[0]->on_error (sub { $finish->(undef, { Status => 599, Reason => $_[2], @pseudo }) });
		702	if ($len) {
		703	$_[0]->on_eof (undef);
		704	$_[0]->on_read (sub {
		705	$len -= length $_[0]{rbuf};
		706
		707	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
		708	or $finish->(undef, { Status => 598, Reason => "Request cancelled by on_body", @pseudo });
		709
		710	$len > 0
		711	or $finish->("", \%hdr);
		712	});
		713	} else {
		714	$_[0]->on_eof (sub {
		715	$finish->("", \%hdr);
		716	});
		717	$_[0]->on_read (sub {
		718	$arg{on_body}(delete $_[0]{rbuf}, \%hdr)
		719	or $finish->(undef, { Status => 598, Reason => "Request cancelled by on_body", @pseudo });
		720	});
		721	}
		722	} else {
		723	$_[0]->on_eof (undef);
		724
		725	if ($len) {
		726	$_[0]->on_error (sub { $finish->(undef, { Status => 599, Reason => $_[2], @pseudo }) });
		727	$_[0]->on_read (sub {
		728	$finish->((substr delete $_[0]{rbuf}, 0, $len, ""), \%hdr)
		729	if $len <= length $_[0]{rbuf};
		730	});
		731	} else {
		732	$_[0]->on_error (sub {
		733	($! == Errno::EPIPE \|\| !$!)
		734	? $finish->(delete $_[0]{rbuf}, \%hdr)
		735	: $finish->(undef, { Status => 599, Reason => $_[2], @pseudo });
		736	});
		737	$_[0]->on_read (sub { });
		738	}
		739	}
		740	}
		741	});
		742	};
		743
		744	# now handle proxy-CONNECT method
		745	if ($proxy && $uscheme eq "https") {
		746	# oh dear, we have to wrap it into a connect request
		747
		748	# maybe re-use $uauthority with patched port?
		749	$state{handle}->push_write ("CONNECT $uhost:$uport HTTP/1.0\015\012Host: $uhost\015\012\015\012");
		750	$state{handle}->push_read (line => $qr_nlnl, sub {
		751	$_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )?/ix
		752	or return (%state = (), $cb->(undef, { Status => 599, Reason => "Invalid proxy connect response ($_[1])", @pseudo }));
		753
		754	if ($2 == 200) {
		755	$rpath = $upath;
		756	&$handle_actual_request;
		757	} else {
241	%state = ();	758	%state = ();
242	$cb->($_[1], \%hdr);	759	$cb->(undef, { Status => $2, Reason => $3, @pseudo });
		760	}
243	});	761	});
244	} else {	762	} else {
245	# too bad, need to read until we get an error or EOF,	763	&$handle_actual_request;
246	# no way to detect winged data.
247	$_[0]->on_error (sub {
248	%state = ();
249	$cb->($_[0]{rbuf}, \%hdr);
250	});
251	$_[0]->on_eof (undef);
252	$_[0]->on_read (sub { });
253	}	764	}
		765
254	});	766	},
		767	$arg{on_prepare} \|\| sub { $timeout }
255	});	768	);
256	}, sub {
257	$timeout
258	};	769	};
259		770
260	defined wantarray && AnyEvent::Util::guard { %state = () }	771	defined wantarray && AnyEvent::Util::guard { %state = () }
261	}	772	}
262		773
263	sub http_get($$;@) {	774	sub http_get($@) {
264	unshift @_, "GET";	775	unshift @_, "GET";
265	&http_request	776	&http_request
266	}	777	}
267		778
		779	sub http_head($@) {
		780	unshift @_, "HEAD";
		781	&http_request
		782	}
		783
		784	sub http_post($$@) {
		785	my $url = shift;
		786	unshift @_, "POST", $url, "body";
		787	&http_request
		788	}
		789
		790	=back
		791
		792	=head2 DNS CACHING
		793
		794	AnyEvent::HTTP uses the AnyEvent::Socket::tcp_connect function for
		795	the actual connection, which in turn uses AnyEvent::DNS to resolve
		796	hostnames. The latter is a simple stub resolver and does no caching
		797	on its own. If you want DNS caching, you currently have to provide
		798	your own default resolver (by storing a suitable resolver object in
		799	C<$AnyEvent::DNS::RESOLVER>).
		800
268	=head2 GLOBAL FUNCTIONS AND VARIABLES	801	=head2 GLOBAL FUNCTIONS AND VARIABLES
269		802
270	=over 4	803	=over 4
271		804
272	=item AnyEvent::HTTP::set_proxy "proxy-url"	805	=item AnyEvent::HTTP::set_proxy "proxy-url"
273		806
274	Sets the default proxy server to use. The proxy-url must begin with a	807	Sets the default proxy server to use. The proxy-url must begin with a
275	string of the form C<http://host:port> (optionally C<https:...>).	808	string of the form C<http://host:port> (optionally C<https:...>), croaks
		809	otherwise.
276		810
		811	To clear an already-set proxy, use C<undef>.
		812
		813	=item $date = AnyEvent::HTTP::format_date $timestamp
		814
		815	Takes a POSIX timestamp (seconds since the epoch) and formats it as a HTTP
		816	Date (RFC 2616).
		817
		818	=item $timestamp = AnyEvent::HTTP::parse_date $date
		819
		820	Takes a HTTP Date (RFC 2616) and returns the corresponding POSIX
		821	timestamp, or C<undef> if the date cannot be parsed.
		822
277	=item $AnyEvent::HTTP::MAX_REDIRECTS	823	=item $AnyEvent::HTTP::MAX_RECURSE
278		824
279	The default value for the C<max_redirects> request parameter	825	The default value for the C<recurse> request parameter (default: C<10>).
280	(default: C<10>).
281		826
282	=item $AnyEvent::HTTP::USERAGENT	827	=item $AnyEvent::HTTP::USERAGENT
283		828
284	The default value for the C<User-Agent> header (the default is	829	The default value for the C<User-Agent> header (the default is
285	C<Mozilla/5.0 (compatible; AnyEvent::HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)>).	830	C<Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)>).
286		831
287	=item $AnyEvent::HTTP::MAX_PERSISTENT	832	=item $AnyEvent::HTTP::MAX_PER_HOST
288		833
289	The maximum number of persistent connections to keep open (default: 8).	834	The maximum number of concurrent connections to the same host (identified
		835	by the hostname). If the limit is exceeded, then the additional requests
		836	are queued until previous connections are closed.
290		837
291	=item $AnyEvent::HTTP::PERSISTENT_TIMEOUT	838	The default value for this is C<4>, and it is highly advisable to not
		839	increase it.
292		840
293	The maximum time to cache a persistent connection, in seconds (default: 2).	841	=item $AnyEvent::HTTP::ACTIVE
		842
		843	The number of active connections. This is not the number of currently
		844	running requests, but the number of currently open and non-idle TCP
		845	connections. This number of can be useful for load-leveling.
294		846
295	=back	847	=back
296		848
297	=cut	849	=cut
298		850
		851	our @month = qw(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec);
		852	our @weekday = qw(Sun Mon Tue Wed Thu Fri Sat);
		853
		854	sub format_date($) {
		855	my ($time) = @_;
		856
		857	# RFC 822/1123 format
		858	my ($S, $M, $H, $mday, $mon, $year, $wday, $yday, undef) = gmtime $time;
		859
		860	sprintf "%s, %02d %s %04d %02d:%02d:%02d GMT",
		861	$weekday[$wday], $mday, $month[$mon], $year + 1900,
		862	$H, $M, $S;
		863	}
		864
		865	sub parse_date($) {
		866	my ($date) = @_;
		867
		868	my ($d, $m, $y, $H, $M, $S);
		869
		870	if ($date =~ /^[A-Z][a-z][a-z], ([0-9][0-9]) ([A-Z][a-z][a-z]) ([0-9][0-9][0-9][0-9]) ([0-9][0-9]):([0-9][0-9]):([0-9][0-9]) GMT$/) {
		871	# RFC 822/1123, required by RFC 2616
		872	($d, $m, $y, $H, $M, $S) = ($1, $2, $3, $4, $5, $6);
		873
		874	} elsif ($date =~ /^[A-Z][a-z]+, ([0-9][0-9])-([A-Z][a-z][a-z])-([0-9][0-9]) ([0-9][0-9]):([0-9][0-9]):([0-9][0-9]) GMT$/) {
		875	# RFC 850
		876	($d, $m, $y, $H, $M, $S) = ($1, $2, $3 < 69 ? $3 + 2000 : $3 + 1900, $4, $5, $6);
		877
		878	} elsif ($date =~ /^[A-Z][a-z][a-z] ([A-Z][a-z][a-z]) ([0-9 ][0-9]) ([0-9][0-9]):([0-9][0-9]):([0-9][0-9]) ([0-9][0-9][0-9][0-9])$/) {
		879	# ISO C's asctime
		880	($d, $m, $y, $H, $M, $S) = ($2, $1, $6, $3, $4, $5);
		881	}
		882	# other formats fail in the loop below
		883
		884	for (0..11) {
		885	if ($m eq $month[$_]) {
		886	require Time::Local;
		887	return Time::Local::timegm ($S, $M, $H, $d, $_, $y);
		888	}
		889	}
		890
		891	undef
		892	}
		893
299	sub set_proxy($) {	894	sub set_proxy($) {
		895	if (length $_[0]) {
300	$PROXY = [$2, $3 \|\| 3128, $1] if $_[0] =~ m%^(https?):// ([^:/]+) (?: : (\d*) )?%ix;	896	$_[0] =~ m%^(https?):// ([^:/]+) (?: : (\d*) )?%ix
		897	or Carp::croak "$_[0]: invalid proxy URL";
		898	$PROXY = [$2, $3 \|\| 3128, $1]
		899	} else {
		900	undef $PROXY;
		901	}
301	}	902	}
302		903
303	# initialise proxy from environment	904	# initialise proxy from environment
		905	eval {
304	set_proxy $ENV{http_proxy};	906	set_proxy $ENV{http_proxy};
		907	};
		908
		909	=head2 SOCKS PROXIES
		910
		911	Socks proxies are not directly supported by AnyEvent::HTTP. You can
		912	compile your perl to support socks, or use an external program such as
		913	F<socksify> (dante) or F<tsocks> to make your program use a socks proxy
		914	transparently.
		915
		916	Alternatively, for AnyEvent::HTTP only, you can use your own
		917	C<tcp_connect> function that does the proxy handshake - here is an example
		918	that works with socks4a proxies:
		919
		920	use Errno;
		921	use AnyEvent::Util;
		922	use AnyEvent::Socket;
		923	use AnyEvent::Handle;
		924
		925	# host, port and username of/for your socks4a proxy
		926	my $socks_host = "10.0.0.23";
		927	my $socks_port = 9050;
		928	my $socks_user = "";
		929
		930	sub socks4a_connect {
		931	my ($host, $port, $connect_cb, $prepare_cb) = @_;
		932
		933	my $hdl = new AnyEvent::Handle
		934	connect => [$socks_host, $socks_port],
		935	on_prepare => sub { $prepare_cb->($_[0]{fh}) },
		936	on_error => sub { $connect_cb->() },
		937	;
		938
		939	$hdl->push_write (pack "CCnNZZ", 4, 1, $port, 1, $socks_user, $host);
		940
		941	$hdl->push_read (chunk => 8, sub {
		942	my ($hdl, $chunk) = @_;
		943	my ($status, $port, $ipn) = unpack "xCna4", $chunk;
		944
		945	if ($status == 0x5a) {
		946	$connect_cb->($hdl->{fh}, (format_address $ipn) . ":$port");
		947	} else {
		948	$! = Errno::ENXIO; $connect_cb->();
		949	}
		950	});
		951
		952	$hdl
		953	}
		954
		955	Use C<socks4a_connect> instead of C<tcp_connect> when doing C<http_request>s,
		956	possibly after switching off other proxy types:
		957
		958	AnyEvent::HTTP::set_proxy undef; # usually you do not want other proxies
		959
		960	http_get 'http://www.google.com', tcp_connect => \&socks4a_connect, sub {
		961	my ($data, $headers) = @_;
		962	...
		963	};
305		964
306	=head1 SEE ALSO	965	=head1 SEE ALSO
307		966
308	L<AnyEvent>.	967	L<AnyEvent>.
309		968
310	=head1 AUTHOR	969	=head1 AUTHOR
311		970
312	Marc Lehmann <schmorp@schmorp.de>	971	Marc Lehmann <schmorp@schmorp.de>
313	http://home.schmorp.de/	972	http://home.schmorp.de/
		973
		974	With many thanks to Дмитрий Шалашов, who provided countless
		975	testcases and bugreports.
314		976
315	=cut	977	=cut
316		978
317	1	979	1
318		980

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Comparing AnyEvent-HTTP/HTTP.pm (file contents): Revision 1.2 by root, Wed Jun 4 11:37:41 2008 UTC vs. Revision 1.62 by root, Thu Dec 30 04:30:24 2010 UTC

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Comparing AnyEvent-HTTP/HTTP.pm (file contents):
Revision 1.2 by root, Wed Jun 4 11:37:41 2008 UTC vs.
Revision 1.62 by root, Thu Dec 30 04:30:24 2010 UTC