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Revision 1.61 by root, Fri Jun 6 10:23:50 2008 UTC vs.
Revision 1.165 by root, Mon Jul 27 22:49:23 2009 UTC

1	package AnyEvent::Handle;	1	package AnyEvent::Handle;
2		2
3	no warnings;
4	use strict;
5
6	use AnyEvent ();
7	use AnyEvent::Util qw(WSAEWOULDBLOCK);
8	use Scalar::Util ();	3	use Scalar::Util ();
9	use Carp ();	4	use Carp ();
10	use Fcntl ();
11	use Errno qw(EAGAIN EINTR);	5	use Errno qw(EAGAIN EINTR);
12		6
		7	use AnyEvent (); BEGIN { AnyEvent::common_sense }
		8	use AnyEvent::Util qw(WSAEWOULDBLOCK);
		9
13	=head1 NAME	10	=head1 NAME
14		11
15	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent	12	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent
16		13
17	=cut	14	=cut
18		15
19	our $VERSION = 4.14;	16	our $VERSION = 4.87;
20		17
21	=head1 SYNOPSIS	18	=head1 SYNOPSIS
22		19
23	use AnyEvent;	20	use AnyEvent;
24	use AnyEvent::Handle;	21	use AnyEvent::Handle;
25		22
26	my $cv = AnyEvent->condvar;	23	my $cv = AnyEvent->condvar;
27		24
28	my $handle =	25	my $hdl; $hdl = new AnyEvent::Handle
29	AnyEvent::Handle->new (
30	fh => \*STDIN,	26	fh => \*STDIN,
31	on_eof => sub {	27	on_error => sub {
32	$cv->broadcast;	28	my ($hdl, $fatal, $msg) = @_;
33	},	29	warn "got error $msg\n";
		30	$hdl->destroy;
		31	$cv->send;
34	);	32	);
35		33
36	# send some request line	34	# send some request line
37	$handle->push_write ("getinfo\015\012");	35	$hdl->push_write ("getinfo\015\012");
38		36
39	# read the response line	37	# read the response line
40	$handle->push_read (line => sub {	38	$hdl->push_read (line => sub {
41	my ($handle, $line) = @_;	39	my ($hdl, $line) = @_;
42	warn "read line <$line>\n";	40	warn "got line <$line>\n";
43	$cv->send;	41	$cv->send;
44	});	42	});
45		43
46	$cv->recv;	44	$cv->recv;
47		45
48	=head1 DESCRIPTION	46	=head1 DESCRIPTION
49		47
50	This module is a helper module to make it easier to do event-based I/O on	48	This module is a helper module to make it easier to do event-based I/O on
51	filehandles. For utility functions for doing non-blocking connects and accepts	49	filehandles.
52	on sockets see L<AnyEvent::Util>.	50
		51	The L<AnyEvent::Intro> tutorial contains some well-documented
		52	AnyEvent::Handle examples.
53		53
54	In the following, when the documentation refers to of "bytes" then this	54	In the following, when the documentation refers to of "bytes" then this
55	means characters. As sysread and syswrite are used for all I/O, their	55	means characters. As sysread and syswrite are used for all I/O, their
56	treatment of characters applies to this module as well.	56	treatment of characters applies to this module as well.
57		57
		58	At the very minimum, you should specify C<fh> or C<connect>, and the
		59	C<on_error> callback.
		60
58	All callbacks will be invoked with the handle object as their first	61	All callbacks will be invoked with the handle object as their first
59	argument.	62	argument.
60		63
61	=head1 METHODS	64	=head1 METHODS
62		65
63	=over 4	66	=over 4
64		67
65	=item B<new (%args)>	68	=item $handle = B<new> AnyEvent::TLS fh => $filehandle, key => value...
66		69
67	The constructor supports these arguments (all as key => value pairs).	70	The constructor supports these arguments (all as C<< key => value >> pairs).
68		71
69	=over 4	72	=over 4
70		73
71	=item fh => $filehandle [MANDATORY]	74	=item fh => $filehandle [C<fh> or C<connect> MANDATORY]
72		75
73	The filehandle this L<AnyEvent::Handle> object will operate on.	76	The filehandle this L<AnyEvent::Handle> object will operate on.
74
75	NOTE: The filehandle will be set to non-blocking (using	77	NOTE: The filehandle will be set to non-blocking mode (using
76	AnyEvent::Util::fh_nonblocking).	78	C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in
		79	that mode.
77		80
		81	=item connect => [$host, $service] [C<fh> or C<connect> MANDATORY]
		82
		83	Try to connect to the specified host and service (port), using
		84	C<AnyEvent::Socket::tcp_connect>. The C<$host> additionally becomes the
		85	default C<peername>.
		86
		87	You have to specify either this parameter, or C<fh>, above.
		88
		89	It is possible to push requests on the read and write queues, and modify
		90	properties of the stream, even while AnyEvent::Handle is connecting.
		91
		92	When this parameter is specified, then the C<on_prepare>,
		93	C<on_connect_error> and C<on_connect> callbacks will be called under the
		94	appropriate circumstances:
		95
		96	=over 4
		97
78	=item on_eof => $cb->($handle)	98	=item on_prepare => $cb->($handle)
79		99
80	Set the callback to be called when an end-of-file condition is detcted,	100	This (rarely used) callback is called before a new connection is
81	i.e. in the case of a socket, when the other side has closed the	101	attempted, but after the file handle has been created. It could be used to
82	connection cleanly.	102	prepare the file handle with parameters required for the actual connect
		103	(as opposed to settings that can be changed when the connection is already
		104	established).
83		105
84	While not mandatory, it is highly recommended to set an eof callback,	106	The return value of this callback should be the connect timeout value in
85	otherwise you might end up with a closed socket while you are still	107	seconds (or C<0>, or C<undef>, or the empty list, to indicate the default
86	waiting for data.	108	timeout is to be used).
87		109
		110	=item on_connect => $cb->($handle, $host, $port, $retry->())
		111
		112	This callback is called when a connection has been successfully established.
		113
		114	The actual numeric host and port (the socket peername) are passed as
		115	parameters, together with a retry callback.
		116
		117	When, for some reason, the handle is not acceptable, then calling
		118	C<$retry> will continue with the next conenction target (in case of
		119	multi-homed hosts or SRV records there can be multiple connection
		120	endpoints). When it is called then the read and write queues, eof status,
		121	tls status and similar properties of the handle are being reset.
		122
		123	In most cases, ignoring the C<$retry> parameter is the way to go.
		124
		125	=item on_connect_error => $cb->($handle, $message)
		126
		127	This callback is called when the conenction could not be
		128	established. C<$!> will contain the relevant error code, and C<$message> a
		129	message describing it (usually the same as C<"$!">).
		130
		131	If this callback isn't specified, then C<on_error> will be called with a
		132	fatal error instead.
		133
		134	=back
		135
88	=item on_error => $cb->($handle, $fatal)	136	=item on_error => $cb->($handle, $fatal, $message)
89		137
90	This is the error callback, which is called when, well, some error	138	This is the error callback, which is called when, well, some error
91	occured, such as not being able to resolve the hostname, failure to	139	occured, such as not being able to resolve the hostname, failure to
92	connect or a read error.	140	connect or a read error.
93		141
94	Some errors are fatal (which is indicated by C<$fatal> being true). On	142	Some errors are fatal (which is indicated by C<$fatal> being true). On
95	fatal errors the handle object will be shut down and will not be	143	fatal errors the handle object will be destroyed (by a call to C<< ->
		144	destroy >>) after invoking the error callback (which means you are free to
		145	examine the handle object). Examples of fatal errors are an EOF condition
		146	with active (but unsatisifable) read watchers (C<EPIPE>) or I/O errors. In
		147	cases where the other side can close the connection at their will it is
		148	often easiest to not report C<EPIPE> errors in this callback.
		149
		150	AnyEvent::Handle tries to find an appropriate error code for you to check
		151	against, but in some cases (TLS errors), this does not work well. It is
		152	recommended to always output the C<$message> argument in human-readable
		153	error messages (it's usually the same as C<"$!">).
		154
96	usable. Non-fatal errors can be retried by simply returning, but it is	155	Non-fatal errors can be retried by simply returning, but it is recommended
97	recommended to simply ignore this parameter and instead abondon the handle	156	to simply ignore this parameter and instead abondon the handle object
98	object when this callback is invoked.	157	when this callback is invoked. Examples of non-fatal errors are timeouts
		158	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
99		159
100	On callback entrance, the value of C<$!> contains the operating system	160	On callback entrance, the value of C<$!> contains the operating system
101	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).	161	error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or
		162	C<EPROTO>).
102		163
103	While not mandatory, it is I<highly> recommended to set this callback, as	164	While not mandatory, it is I<highly> recommended to set this callback, as
104	you will not be notified of errors otherwise. The default simply calls	165	you will not be notified of errors otherwise. The default simply calls
105	C<croak>.	166	C<croak>.
106		167
…		…
110	and no read request is in the queue (unlike read queue callbacks, this	171	and no read request is in the queue (unlike read queue callbacks, this
111	callback will only be called when at least one octet of data is in the	172	callback will only be called when at least one octet of data is in the
112	read buffer).	173	read buffer).
113		174
114	To access (and remove data from) the read buffer, use the C<< ->rbuf >>	175	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
115	method or access the C<$handle->{rbuf}> member directly.	176	method or access the C<< $handle->{rbuf} >> member directly. Note that you
		177	must not enlarge or modify the read buffer, you can only remove data at
		178	the beginning from it.
116		179
117	When an EOF condition is detected then AnyEvent::Handle will first try to	180	When an EOF condition is detected then AnyEvent::Handle will first try to
118	feed all the remaining data to the queued callbacks and C<on_read> before	181	feed all the remaining data to the queued callbacks and C<on_read> before
119	calling the C<on_eof> callback. If no progress can be made, then a fatal	182	calling the C<on_eof> callback. If no progress can be made, then a fatal
120	error will be raised (with C<$!> set to C<EPIPE>).	183	error will be raised (with C<$!> set to C<EPIPE>).
121		184
		185	Note that, unlike requests in the read queue, an C<on_read> callback
		186	doesn't mean you I<require> some data: if there is an EOF and there
		187	are outstanding read requests then an error will be flagged. With an
		188	C<on_read> callback, the C<on_eof> callback will be invoked.
		189
		190	=item on_eof => $cb->($handle)
		191
		192	Set the callback to be called when an end-of-file condition is detected,
		193	i.e. in the case of a socket, when the other side has closed the
		194	connection cleanly, and there are no outstanding read requests in the
		195	queue (if there are read requests, then an EOF counts as an unexpected
		196	connection close and will be flagged as an error).
		197
		198	For sockets, this just means that the other side has stopped sending data,
		199	you can still try to write data, and, in fact, one can return from the EOF
		200	callback and continue writing data, as only the read part has been shut
		201	down.
		202
		203	If an EOF condition has been detected but no C<on_eof> callback has been
		204	set, then a fatal error will be raised with C<$!> set to <0>.
		205
122	=item on_drain => $cb->($handle)	206	=item on_drain => $cb->($handle)
123		207
124	This sets the callback that is called when the write buffer becomes empty	208	This sets the callback that is called when the write buffer becomes empty
125	(or when the callback is set and the buffer is empty already).	209	(or when the callback is set and the buffer is empty already).
126		210
127	To append to the write buffer, use the C<< ->push_write >> method.	211	To append to the write buffer, use the C<< ->push_write >> method.
		212
		213	This callback is useful when you don't want to put all of your write data
		214	into the queue at once, for example, when you want to write the contents
		215	of some file to the socket you might not want to read the whole file into
		216	memory and push it into the queue, but instead only read more data from
		217	the file when the write queue becomes empty.
128		218
129	=item timeout => $fractional_seconds	219	=item timeout => $fractional_seconds
130		220
131	If non-zero, then this enables an "inactivity" timeout: whenever this many	221	If non-zero, then this enables an "inactivity" timeout: whenever this many
132	seconds pass without a successful read or write on the underlying file	222	seconds pass without a successful read or write on the underlying file
133	handle, the C<on_timeout> callback will be invoked (and if that one is	223	handle, the C<on_timeout> callback will be invoked (and if that one is
134	missing, an C<ETIMEDOUT> error will be raised).	224	missing, a non-fatal C<ETIMEDOUT> error will be raised).
135		225
136	Note that timeout processing is also active when you currently do not have	226	Note that timeout processing is also active when you currently do not have
137	any outstanding read or write requests: If you plan to keep the connection	227	any outstanding read or write requests: If you plan to keep the connection
138	idle then you should disable the timout temporarily or ignore the timeout	228	idle then you should disable the timout temporarily or ignore the timeout
139	in the C<on_timeout> callback.	229	in the C<on_timeout> callback, in which case AnyEvent::Handle will simply
		230	restart the timeout.
140		231
141	Zero (the default) disables this timeout.	232	Zero (the default) disables this timeout.
142		233
143	=item on_timeout => $cb->($handle)	234	=item on_timeout => $cb->($handle)
144		235
…		…
148		239
149	=item rbuf_max => <bytes>	240	=item rbuf_max => <bytes>
150		241
151	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)	242	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)
152	when the read buffer ever (strictly) exceeds this size. This is useful to	243	when the read buffer ever (strictly) exceeds this size. This is useful to
153	avoid denial-of-service attacks.	244	avoid some forms of denial-of-service attacks.
154		245
155	For example, a server accepting connections from untrusted sources should	246	For example, a server accepting connections from untrusted sources should
156	be configured to accept only so-and-so much data that it cannot act on	247	be configured to accept only so-and-so much data that it cannot act on
157	(for example, when expecting a line, an attacker could send an unlimited	248	(for example, when expecting a line, an attacker could send an unlimited
158	amount of data without a callback ever being called as long as the line	249	amount of data without a callback ever being called as long as the line
159	isn't finished).	250	isn't finished).
160		251
		252	=item autocork => <boolean>
		253
		254	When disabled (the default), then C<push_write> will try to immediately
		255	write the data to the handle, if possible. This avoids having to register
		256	a write watcher and wait for the next event loop iteration, but can
		257	be inefficient if you write multiple small chunks (on the wire, this
		258	disadvantage is usually avoided by your kernel's nagle algorithm, see
		259	C<no_delay>, but this option can save costly syscalls).
		260
		261	When enabled, then writes will always be queued till the next event loop
		262	iteration. This is efficient when you do many small writes per iteration,
		263	but less efficient when you do a single write only per iteration (or when
		264	the write buffer often is full). It also increases write latency.
		265
		266	=item no_delay => <boolean>
		267
		268	When doing small writes on sockets, your operating system kernel might
		269	wait a bit for more data before actually sending it out. This is called
		270	the Nagle algorithm, and usually it is beneficial.
		271
		272	In some situations you want as low a delay as possible, which can be
		273	accomplishd by setting this option to a true value.
		274
		275	The default is your opertaing system's default behaviour (most likely
		276	enabled), this option explicitly enables or disables it, if possible.
		277
161	=item read_size => <bytes>	278	=item read_size => <bytes>
162		279
163	The default read block size (the amount of bytes this module will try to read	280	The default read block size (the amount of bytes this module will
164	during each (loop iteration). Default: C<8192>.	281	try to read during each loop iteration, which affects memory
		282	requirements). Default: C<8192>.
165		283
166	=item low_water_mark => <bytes>	284	=item low_water_mark => <bytes>
167		285
168	Sets the amount of bytes (default: C<0>) that make up an "empty" write	286	Sets the amount of bytes (default: C<0>) that make up an "empty" write
169	buffer: If the write reaches this size or gets even samller it is	287	buffer: If the write reaches this size or gets even samller it is
170	considered empty.	288	considered empty.
171		289
		290	Sometimes it can be beneficial (for performance reasons) to add data to
		291	the write buffer before it is fully drained, but this is a rare case, as
		292	the operating system kernel usually buffers data as well, so the default
		293	is good in almost all cases.
		294
		295	=item linger => <seconds>
		296
		297	If non-zero (default: C<3600>), then the destructor of the
		298	AnyEvent::Handle object will check whether there is still outstanding
		299	write data and will install a watcher that will write this data to the
		300	socket. No errors will be reported (this mostly matches how the operating
		301	system treats outstanding data at socket close time).
		302
		303	This will not work for partial TLS data that could not be encoded
		304	yet. This data will be lost. Calling the C<stoptls> method in time might
		305	help.
		306
		307	=item peername => $string
		308
		309	A string used to identify the remote site - usually the DNS hostname
		310	(I<not> IDN!) used to create the connection, rarely the IP address.
		311
		312	Apart from being useful in error messages, this string is also used in TLS
		313	peername verification (see C<verify_peername> in L<AnyEvent::TLS>). This
		314	verification will be skipped when C<peername> is not specified or
		315	C<undef>.
		316
172	=item tls => "accept" | "connect" | Net::SSLeay::SSL object	317	=item tls => "accept" | "connect" | Net::SSLeay::SSL object
173		318
174	When this parameter is given, it enables TLS (SSL) mode, that means it	319	When this parameter is given, it enables TLS (SSL) mode, that means
175	will start making tls handshake and will transparently encrypt/decrypt	320	AnyEvent will start a TLS handshake as soon as the conenction has been
176	data.	321	established and will transparently encrypt/decrypt data afterwards.
		322
		323	All TLS protocol errors will be signalled as C<EPROTO>, with an
		324	appropriate error message.
177		325
178	TLS mode requires Net::SSLeay to be installed (it will be loaded	326	TLS mode requires Net::SSLeay to be installed (it will be loaded
179	automatically when you try to create a TLS handle).	327	automatically when you try to create a TLS handle): this module doesn't
		328	have a dependency on that module, so if your module requires it, you have
		329	to add the dependency yourself.
180		330
181	For the TLS server side, use C<accept>, and for the TLS client side of a	331	Unlike TCP, TLS has a server and client side: for the TLS server side, use
182	connection, use C<connect> mode.	332	C<accept>, and for the TLS client side of a connection, use C<connect>
		333	mode.
183		334
184	You can also provide your own TLS connection object, but you have	335	You can also provide your own TLS connection object, but you have
185	to make sure that you call either C<Net::SSLeay::set_connect_state>	336	to make sure that you call either C<Net::SSLeay::set_connect_state>
186	or C<Net::SSLeay::set_accept_state> on it before you pass it to	337	or C<Net::SSLeay::set_accept_state> on it before you pass it to
187	AnyEvent::Handle.	338	AnyEvent::Handle. Also, this module will take ownership of this connection
		339	object.
188		340
		341	At some future point, AnyEvent::Handle might switch to another TLS
		342	implementation, then the option to use your own session object will go
		343	away.
		344
		345	B<IMPORTANT:> since Net::SSLeay "objects" are really only integers,
		346	passing in the wrong integer will lead to certain crash. This most often
		347	happens when one uses a stylish C<< tls => 1 >> and is surprised about the
		348	segmentation fault.
		349
189	See the C<starttls> method if you need to start TLs negotiation later.	350	See the C<< ->starttls >> method for when need to start TLS negotiation later.
190		351
191	=item tls_ctx => $ssl_ctx	352	=item tls_ctx => $anyevent_tls
192		353
193	Use the given Net::SSLeay::CTX object to create the new TLS connection	354	Use the given C<AnyEvent::TLS> object to create the new TLS connection
194	(unless a connection object was specified directly). If this parameter is	355	(unless a connection object was specified directly). If this parameter is
195	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	356	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
196		357
		358	Instead of an object, you can also specify a hash reference with C<< key
		359	=> value >> pairs. Those will be passed to L<AnyEvent::TLS> to create a
		360	new TLS context object.
		361
		362	=item on_starttls => $cb->($handle, $success[, $error_message])
		363
		364	This callback will be invoked when the TLS/SSL handshake has finished. If
		365	C<$success> is true, then the TLS handshake succeeded, otherwise it failed
		366	(C<on_stoptls> will not be called in this case).
		367
		368	The session in C<< $handle->{tls} >> can still be examined in this
		369	callback, even when the handshake was not successful.
		370
		371	TLS handshake failures will not cause C<on_error> to be invoked when this
		372	callback is in effect, instead, the error message will be passed to C<on_starttls>.
		373
		374	Without this callback, handshake failures lead to C<on_error> being
		375	called, as normal.
		376
		377	Note that you cannot call C<starttls> right again in this callback. If you
		378	need to do that, start an zero-second timer instead whose callback can
		379	then call C<< ->starttls >> again.
		380
		381	=item on_stoptls => $cb->($handle)
		382
		383	When a SSLv3/TLS shutdown/close notify/EOF is detected and this callback is
		384	set, then it will be invoked after freeing the TLS session. If it is not,
		385	then a TLS shutdown condition will be treated like a normal EOF condition
		386	on the handle.
		387
		388	The session in C<< $handle->{tls} >> can still be examined in this
		389	callback.
		390
		391	This callback will only be called on TLS shutdowns, not when the
		392	underlying handle signals EOF.
		393
197	=item json => JSON or JSON::XS object	394	=item json => JSON or JSON::XS object
198		395
199	This is the json coder object used by the C<json> read and write types.	396	This is the json coder object used by the C<json> read and write types.
200		397
201	If you don't supply it, then AnyEvent::Handle will create and use a	398	If you don't supply it, then AnyEvent::Handle will create and use a
202	suitable one, which will write and expect UTF-8 encoded JSON texts.	399	suitable one (on demand), which will write and expect UTF-8 encoded JSON
		400	texts.
203		401
204	Note that you are responsible to depend on the JSON module if you want to	402	Note that you are responsible to depend on the JSON module if you want to
205	use this functionality, as AnyEvent does not have a dependency itself.	403	use this functionality, as AnyEvent does not have a dependency itself.
206		404
207	=item filter_r => $cb
208
209	=item filter_w => $cb
210
211	These exist, but are undocumented at this time.
212
213	=back	405	=back
214		406
215	=cut	407	=cut
216		408
217	sub new {	409	sub new {
218	my $class = shift;	410	my $class = shift;
219
220	my $self = bless { @_ }, $class;	411	my $self = bless { @_ }, $class;
221		412
222	$self->{fh} or Carp::croak "mandatory argument fh is missing";	413	if ($self->{fh}) {
		414	$self->_start;
		415	return unless $self->{fh}; # could be gone by now
		416
		417	} elsif ($self->{connect}) {
		418	require AnyEvent::Socket;
		419
		420	$self->{peername} = $self->{connect}[0]
		421	unless exists $self->{peername};
		422
		423	$self->{_skip_drain_rbuf} = 1;
		424
		425	{
		426	Scalar::Util::weaken (my $self = $self);
		427
		428	$self->{_connect} =
		429	AnyEvent::Socket::tcp_connect (
		430	$self->{connect}[0],
		431	$self->{connect}[1],
		432	sub {
		433	my ($fh, $host, $port, $retry) = @_;
		434
		435	if ($fh) {
		436	$self->{fh} = $fh;
		437
		438	delete $self->{_skip_drain_rbuf};
		439	$self->_start;
		440
		441	$self->{on_connect}
		442	and $self->{on_connect}($self, $host, $port, sub {
		443	delete @$self{qw(fh _tw _ww _rw _eof _queue rbuf _wbuf tls _tls_rbuf _tls_wbuf)};
		444	$self->{_skip_drain_rbuf} = 1;
		445	&$retry;
		446	});
		447
		448	} else {
		449	if ($self->{on_connect_error}) {
		450	$self->{on_connect_error}($self, "$!");
		451	$self->destroy;
		452	} else {
		453	$self->_error ($!, 1);
		454	}
		455	}
		456	},
		457	sub {
		458	local $self->{fh} = $_[0];
		459
		460	$self->{on_prepare}
		461	? $self->{on_prepare}->($self)
		462	: ()
		463	}
		464	);
		465	}
		466
		467	} else {
		468	Carp::croak "AnyEvent::Handle: either an existing fh or the connect parameter must be specified";
		469	}
		470
		471	$self
		472	}
		473
		474	sub _start {
		475	my ($self) = @_;
223		476
224	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	477	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
225
226	if ($self->{tls}) {
227	require Net::SSLeay;
228	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});
229	}
230		478
231	$self->{_activity} = AnyEvent->now;	479	$self->{_activity} = AnyEvent->now;
232	$self->_timeout;	480	$self->_timeout;
233		481
		482	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};
		483
		484	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})
		485	if $self->{tls};
		486
234	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};	487	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};
235		488
236	$self	489	$self->start_read
237	}	490	if $self->{on_read} || @{ $self->{_queue} };
238		491
		492	$self->_drain_wbuf;
		493	}
		494
239	sub _shutdown {	495	#sub _shutdown {
240	my ($self) = @_;	496	# my ($self) = @_;
241		497	#
242	delete $self->{_tw};	498	# delete @$self{qw(_tw _rw _ww fh wbuf on_read _queue)};
243	delete $self->{_rw};	499	# $self->{_eof} = 1; # tell starttls et. al to stop trying
244	delete $self->{_ww};	500	#
245	delete $self->{fh};	501	# &_freetls;
246		502	#}
247	$self->stoptls;
248	}
249		503
250	sub _error {	504	sub _error {
251	my ($self, $errno, $fatal) = @_;	505	my ($self, $errno, $fatal, $message) = @_;
252
253	$self->_shutdown
254	if $fatal;
255		506
256	$! = $errno;	507	$! = $errno;
		508	$message ||= "$!";
257		509
258	if ($self->{on_error}) {	510	if ($self->{on_error}) {
259	$self->{on_error}($self, $fatal);	511	$self->{on_error}($self, $fatal, $message);
260	} else {	512	$self->destroy if $fatal;
		513	} elsif ($self->{fh}) {
		514	$self->destroy;
261	Carp::croak "AnyEvent::Handle uncaught error: $!";	515	Carp::croak "AnyEvent::Handle uncaught error: $message";
262	}	516	}
263	}	517	}
264		518
265	=item $fh = $handle->fh	519	=item $fh = $handle->fh
266		520
267	This method returns the file handle of the L<AnyEvent::Handle> object.	521	This method returns the file handle used to create the L<AnyEvent::Handle> object.
268		522
269	=cut	523	=cut
270		524
271	sub fh { $_[0]{fh} }	525	sub fh { $_[0]{fh} }
272		526
…		…
290	$_[0]{on_eof} = $_[1];	544	$_[0]{on_eof} = $_[1];
291	}	545	}
292		546
293	=item $handle->on_timeout ($cb)	547	=item $handle->on_timeout ($cb)
294		548
295	Replace the current C<on_timeout> callback, or disables the callback	549	Replace the current C<on_timeout> callback, or disables the callback (but
296	(but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor	550	not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor
297	argument.	551	argument and method.
298		552
299	=cut	553	=cut
300		554
301	sub on_timeout {	555	sub on_timeout {
302	$_[0]{on_timeout} = $_[1];	556	$_[0]{on_timeout} = $_[1];
		557	}
		558
		559	=item $handle->autocork ($boolean)
		560
		561	Enables or disables the current autocork behaviour (see C<autocork>
		562	constructor argument). Changes will only take effect on the next write.
		563
		564	=cut
		565
		566	sub autocork {
		567	$_[0]{autocork} = $_[1];
		568	}
		569
		570	=item $handle->no_delay ($boolean)
		571
		572	Enables or disables the C<no_delay> setting (see constructor argument of
		573	the same name for details).
		574
		575	=cut
		576
		577	sub no_delay {
		578	$_[0]{no_delay} = $_[1];
		579
		580	eval {
		581	local $SIG{__DIE__};
		582	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1]
		583	if $_[0]{fh};
		584	};
		585	}
		586
		587	=item $handle->on_starttls ($cb)
		588
		589	Replace the current C<on_starttls> callback (see the C<on_starttls> constructor argument).
		590
		591	=cut
		592
		593	sub on_starttls {
		594	$_[0]{on_starttls} = $_[1];
		595	}
		596
		597	=item $handle->on_stoptls ($cb)
		598
		599	Replace the current C<on_stoptls> callback (see the C<on_stoptls> constructor argument).
		600
		601	=cut
		602
		603	sub on_starttls {
		604	$_[0]{on_stoptls} = $_[1];
303	}	605	}
304		606
305	#############################################################################	607	#############################################################################
306		608
307	=item $handle->timeout ($seconds)	609	=item $handle->timeout ($seconds)
…		…
320	# reset the timeout watcher, as neccessary	622	# reset the timeout watcher, as neccessary
321	# also check for time-outs	623	# also check for time-outs
322	sub _timeout {	624	sub _timeout {
323	my ($self) = @_;	625	my ($self) = @_;
324		626
325	if ($self->{timeout}) {	627	if ($self->{timeout} && $self->{fh}) {
326	my $NOW = AnyEvent->now;	628	my $NOW = AnyEvent->now;
327		629
328	# when would the timeout trigger?	630	# when would the timeout trigger?
329	my $after = $self->{_activity} + $self->{timeout} - $NOW;	631	my $after = $self->{_activity} + $self->{timeout} - $NOW;
330		632
…		…
333	$self->{_activity} = $NOW;	635	$self->{_activity} = $NOW;
334		636
335	if ($self->{on_timeout}) {	637	if ($self->{on_timeout}) {
336	$self->{on_timeout}($self);	638	$self->{on_timeout}($self);
337	} else {	639	} else {
338	$self->_error (&Errno::ETIMEDOUT);	640	$self->_error (Errno::ETIMEDOUT);
339	}	641	}
340		642
341	# callback could have changed timeout value, optimise	643	# callback could have changed timeout value, optimise
342	return unless $self->{timeout};	644	return unless $self->{timeout};
343		645
…		…
385	my ($self, $cb) = @_;	687	my ($self, $cb) = @_;
386		688
387	$self->{on_drain} = $cb;	689	$self->{on_drain} = $cb;
388		690
389	$cb->($self)	691	$cb->($self)
390	if $cb && $self->{low_water_mark} >= length $self->{wbuf};	692	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});
391	}	693	}
392		694
393	=item $handle->push_write ($data)	695	=item $handle->push_write ($data)
394		696
395	Queues the given scalar to be written. You can push as much data as you	697	Queues the given scalar to be written. You can push as much data as you
…		…
406	Scalar::Util::weaken $self;	708	Scalar::Util::weaken $self;
407		709
408	my $cb = sub {	710	my $cb = sub {
409	my $len = syswrite $self->{fh}, $self->{wbuf};	711	my $len = syswrite $self->{fh}, $self->{wbuf};
410		712
411	if ($len >= 0) {	713	if (defined $len) {
412	substr $self->{wbuf}, 0, $len, "";	714	substr $self->{wbuf}, 0, $len, "";
413		715
414	$self->{_activity} = AnyEvent->now;	716	$self->{_activity} = AnyEvent->now;
415		717
416	$self->{on_drain}($self)	718	$self->{on_drain}($self)
417	if $self->{low_water_mark} >= length $self->{wbuf}	719	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
418	&& $self->{on_drain};	720	&& $self->{on_drain};
419		721
420	delete $self->{_ww} unless length $self->{wbuf};	722	delete $self->{_ww} unless length $self->{wbuf};
421	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	723	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
422	$self->_error ($!, 1);	724	$self->_error ($!, 1);
423	}	725	}
424	};	726	};
425		727
426	# try to write data immediately	728	# try to write data immediately
427	$cb->();	729	$cb->() unless $self->{autocork};
428		730
429	# if still data left in wbuf, we need to poll	731	# if still data left in wbuf, we need to poll
430	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)	732	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)
431	if length $self->{wbuf};	733	if length $self->{wbuf};
432	};	734	};
…		…
446		748
447	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")	749	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")
448	->($self, @_);	750	->($self, @_);
449	}	751	}
450		752
451	if ($self->{filter_w}) {	753	if ($self->{tls}) {
452	$self->{filter_w}($self, \$_[0]);	754	$self->{_tls_wbuf} .= $_[0];
		755	&_dotls ($self) if $self->{fh};
453	} else {	756	} else {
454	$self->{wbuf} .= $_[0];	757	$self->{wbuf} .= $_[0];
455	$self->_drain_wbuf;	758	$self->_drain_wbuf if $self->{fh};
456	}	759	}
457	}	760	}
458		761
459	=item $handle->push_write (type => @args)	762	=item $handle->push_write (type => @args)
460		763
…		…
474	=cut	777	=cut
475		778
476	register_write_type netstring => sub {	779	register_write_type netstring => sub {
477	my ($self, $string) = @_;	780	my ($self, $string) = @_;
478		781
479	sprintf "%d:%s,", (length $string), $string	782	(length $string) . ":$string,"
480	};	783	};
481		784
482	=item packstring => $format, $data	785	=item packstring => $format, $data
483		786
484	An octet string prefixed with an encoded length. The encoding C<$format>	787	An octet string prefixed with an encoded length. The encoding C<$format>
…		…
489	=cut	792	=cut
490		793
491	register_write_type packstring => sub {	794	register_write_type packstring => sub {
492	my ($self, $format, $string) = @_;	795	my ($self, $format, $string) = @_;
493		796
494	pack "$format/a", $string	797	pack "$format/a*", $string
495	};	798	};
496		799
497	=item json => $array_or_hashref	800	=item json => $array_or_hashref
498		801
499	Encodes the given hash or array reference into a JSON object. Unless you	802	Encodes the given hash or array reference into a JSON object. Unless you
…		…
533		836
534	$self->{json} ? $self->{json}->encode ($ref)	837	$self->{json} ? $self->{json}->encode ($ref)
535	: JSON::encode_json ($ref)	838	: JSON::encode_json ($ref)
536	};	839	};
537		840
		841	=item storable => $reference
		842
		843	Freezes the given reference using L<Storable> and writes it to the
		844	handle. Uses the C<nfreeze> format.
		845
		846	=cut
		847
		848	register_write_type storable => sub {
		849	my ($self, $ref) = @_;
		850
		851	require Storable;
		852
		853	pack "w/a*", Storable::nfreeze ($ref)
		854	};
		855
538	=back	856	=back
		857
		858	=item $handle->push_shutdown
		859
		860	Sometimes you know you want to close the socket after writing your data
		861	before it was actually written. One way to do that is to replace your
		862	C<on_drain> handler by a callback that shuts down the socket (and set
		863	C<low_water_mark> to C<0>). This method is a shorthand for just that, and
		864	replaces the C<on_drain> callback with:
		865
		866	sub { shutdown $_[0]{fh}, 1 } # for push_shutdown
		867
		868	This simply shuts down the write side and signals an EOF condition to the
		869	the peer.
		870
		871	You can rely on the normal read queue and C<on_eof> handling
		872	afterwards. This is the cleanest way to close a connection.
		873
		874	=cut
		875
		876	sub push_shutdown {
		877	my ($self) = @_;
		878
		879	delete $self->{low_water_mark};
		880	$self->on_drain (sub { shutdown $_[0]{fh}, 1 });
		881	}
539		882
540	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)	883	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)
541		884
542	This function (not method) lets you add your own types to C<push_write>.	885	This function (not method) lets you add your own types to C<push_write>.
543	Whenever the given C<type> is used, C<push_write> will invoke the code	886	Whenever the given C<type> is used, C<push_write> will invoke the code
…		…
564	ways, the "simple" way, using only C<on_read> and the "complex" way, using	907	ways, the "simple" way, using only C<on_read> and the "complex" way, using
565	a queue.	908	a queue.
566		909
567	In the simple case, you just install an C<on_read> callback and whenever	910	In the simple case, you just install an C<on_read> callback and whenever
568	new data arrives, it will be called. You can then remove some data (if	911	new data arrives, it will be called. You can then remove some data (if
569	enough is there) from the read buffer (C<< $handle->rbuf >>) if you want	912	enough is there) from the read buffer (C<< $handle->rbuf >>). Or you cna
570	or not.	913	leave the data there if you want to accumulate more (e.g. when only a
		914	partial message has been received so far).
571		915
572	In the more complex case, you want to queue multiple callbacks. In this	916	In the more complex case, you want to queue multiple callbacks. In this
573	case, AnyEvent::Handle will call the first queued callback each time new	917	case, AnyEvent::Handle will call the first queued callback each time new
574	data arrives (also the first time it is queued) and removes it when it has	918	data arrives (also the first time it is queued) and removes it when it has
575	done its job (see C<push_read>, below).	919	done its job (see C<push_read>, below).
…		…
593	# handle xml	937	# handle xml
594	});	938	});
595	});	939	});
596	});	940	});
597		941
598	Example 2: Implement a client for a protocol that replies either with	942	Example 2: Implement a client for a protocol that replies either with "OK"
599	"OK" and another line or "ERROR" for one request, and 64 bytes for the	943	and another line or "ERROR" for the first request that is sent, and 64
600	second request. Due tot he availability of a full queue, we can just	944	bytes for the second request. Due to the availability of a queue, we can
601	pipeline sending both requests and manipulate the queue as necessary in	945	just pipeline sending both requests and manipulate the queue as necessary
602	the callbacks:	946	in the callbacks.
603		947
604	# request one	948	When the first callback is called and sees an "OK" response, it will
		949	C<unshift> another line-read. This line-read will be queued I<before> the
		950	64-byte chunk callback.
		951
		952	# request one, returns either "OK + extra line" or "ERROR"
605	$handle->push_write ("request 1\015\012");	953	$handle->push_write ("request 1\015\012");
606		954
607	# we expect "ERROR" or "OK" as response, so push a line read	955	# we expect "ERROR" or "OK" as response, so push a line read
608	$handle->push_read (line => sub {	956	$handle->push_read (line => sub {
609	# if we got an "OK", we have to _prepend_ another line,	957	# if we got an "OK", we have to _prepend_ another line,
…		…
616	...	964	...
617	});	965	});
618	}	966	}
619	});	967	});
620		968
621	# request two	969	# request two, simply returns 64 octets
622	$handle->push_write ("request 2\015\012");	970	$handle->push_write ("request 2\015\012");
623		971
624	# simply read 64 bytes, always	972	# simply read 64 bytes, always
625	$handle->push_read (chunk => 64, sub {	973	$handle->push_read (chunk => 64, sub {
626	my $response = $_[1];	974	my $response = $_[1];
…		…
632	=cut	980	=cut
633		981
634	sub _drain_rbuf {	982	sub _drain_rbuf {
635	my ($self) = @_;	983	my ($self) = @_;
636		984
		985	# avoid recursion
		986	return if exists $self->{_skip_drain_rbuf};
637	local $self->{_in_drain} = 1;	987	local $self->{_skip_drain_rbuf} = 1;
638		988
639	if (	989	if (
640	defined $self->{rbuf_max}	990	defined $self->{rbuf_max}
641	&& $self->{rbuf_max} < length $self->{rbuf}	991	&& $self->{rbuf_max} < length $self->{rbuf}
642	) {	992	) {
643	return $self->_error (&Errno::ENOSPC, 1);	993	$self->_error (Errno::ENOSPC, 1), return;
644	}	994	}
645		995
646	while () {	996	while () {
647	no strict 'refs';	997	# we need to use a separate tls read buffer, as we must not receive data while
		998	# we are draining the buffer, and this can only happen with TLS.
		999	$self->{rbuf} .= delete $self->{_tls_rbuf}
		1000	if exists $self->{_tls_rbuf};
648		1001
649	my $len = length $self->{rbuf};	1002	my $len = length $self->{rbuf};
650		1003
651	if (my $cb = shift @{ $self->{_queue} }) {	1004	if (my $cb = shift @{ $self->{_queue} }) {
652	unless ($cb->($self)) {	1005	unless ($cb->($self)) {
653	if ($self->{_eof}) {	1006	# no progress can be made
654	# no progress can be made (not enough data and no data forthcoming)	1007	# (not enough data and no data forthcoming)
655	$self->_error (&Errno::EPIPE, 1), last;	1008	$self->_error (Errno::EPIPE, 1), return
656	}	1009	if $self->{_eof};
657		1010
658	unshift @{ $self->{_queue} }, $cb;	1011	unshift @{ $self->{_queue} }, $cb;
659	last;	1012	last;
660	}	1013	}
661	} elsif ($self->{on_read}) {	1014	} elsif ($self->{on_read}) {
…		…
668	&& !@{ $self->{_queue} } # and the queue is still empty	1021	&& !@{ $self->{_queue} } # and the queue is still empty
669	&& $self->{on_read} # but we still have on_read	1022	&& $self->{on_read} # but we still have on_read
670	) {	1023	) {
671	# no further data will arrive	1024	# no further data will arrive
672	# so no progress can be made	1025	# so no progress can be made
673	$self->_error (&Errno::EPIPE, 1), last	1026	$self->_error (Errno::EPIPE, 1), return
674	if $self->{_eof};	1027	if $self->{_eof};
675		1028
676	last; # more data might arrive	1029	last; # more data might arrive
677	}	1030	}
678	} else {	1031	} else {
679	# read side becomes idle	1032	# read side becomes idle
680	delete $self->{_rw};	1033	delete $self->{_rw} unless $self->{tls};
681	last;	1034	last;
682	}	1035	}
683	}	1036	}
684		1037
		1038	if ($self->{_eof}) {
		1039	$self->{on_eof}
685	$self->{on_eof}($self)	1040	? $self->{on_eof}($self)
686	if $self->{_eof} && $self->{on_eof};	1041	: $self->_error (0, 1, "Unexpected end-of-file");
		1042
		1043	return;
		1044	}
687		1045
688	# may need to restart read watcher	1046	# may need to restart read watcher
689	unless ($self->{_rw}) {	1047	unless ($self->{_rw}) {
690	$self->start_read	1048	$self->start_read
691	if $self->{on_read} || @{ $self->{_queue} };	1049	if $self->{on_read} || @{ $self->{_queue} };
…		…
702		1060
703	sub on_read {	1061	sub on_read {
704	my ($self, $cb) = @_;	1062	my ($self, $cb) = @_;
705		1063
706	$self->{on_read} = $cb;	1064	$self->{on_read} = $cb;
707	$self->_drain_rbuf if $cb && !$self->{_in_drain};	1065	$self->_drain_rbuf if $cb;
708	}	1066	}
709		1067
710	=item $handle->rbuf	1068	=item $handle->rbuf
711		1069
712	Returns the read buffer (as a modifiable lvalue).	1070	Returns the read buffer (as a modifiable lvalue).
713		1071
714	You can access the read buffer directly as the C<< ->{rbuf} >> member, if	1072	You can access the read buffer directly as the C<< ->{rbuf} >>
715	you want.	1073	member, if you want. However, the only operation allowed on the
		1074	read buffer (apart from looking at it) is removing data from its
		1075	beginning. Otherwise modifying or appending to it is not allowed and will
		1076	lead to hard-to-track-down bugs.
716		1077
717	NOTE: The read buffer should only be used or modified if the C<on_read>,	1078	NOTE: The read buffer should only be used or modified if the C<on_read>,
718	C<push_read> or C<unshift_read> methods are used. The other read methods	1079	C<push_read> or C<unshift_read> methods are used. The other read methods
719	automatically manage the read buffer.	1080	automatically manage the read buffer.
720		1081
…		…
761	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")	1122	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")
762	->($self, $cb, @_);	1123	->($self, $cb, @_);
763	}	1124	}
764		1125
765	push @{ $self->{_queue} }, $cb;	1126	push @{ $self->{_queue} }, $cb;
766	$self->_drain_rbuf unless $self->{_in_drain};	1127	$self->_drain_rbuf;
767	}	1128	}
768		1129
769	sub unshift_read {	1130	sub unshift_read {
770	my $self = shift;	1131	my $self = shift;
771	my $cb = pop;	1132	my $cb = pop;
…		…
777	->($self, $cb, @_);	1138	->($self, $cb, @_);
778	}	1139	}
779		1140
780		1141
781	unshift @{ $self->{_queue} }, $cb;	1142	unshift @{ $self->{_queue} }, $cb;
782	$self->_drain_rbuf unless $self->{_in_drain};	1143	$self->_drain_rbuf;
783	}	1144	}
784		1145
785	=item $handle->push_read (type => @args, $cb)	1146	=item $handle->push_read (type => @args, $cb)
786		1147
787	=item $handle->unshift_read (type => @args, $cb)	1148	=item $handle->unshift_read (type => @args, $cb)
…		…
817	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");	1178	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");
818	1	1179	1
819	}	1180	}
820	};	1181	};
821		1182
822	# compatibility with older API
823	sub push_read_chunk {
824	$_[0]->push_read (chunk => $_[1], $_[2]);
825	}
826
827	sub unshift_read_chunk {
828	$_[0]->unshift_read (chunk => $_[1], $_[2]);
829	}
830
831	=item line => [$eol, ]$cb->($handle, $line, $eol)	1183	=item line => [$eol, ]$cb->($handle, $line, $eol)
832		1184
833	The callback will be called only once a full line (including the end of	1185	The callback will be called only once a full line (including the end of
834	line marker, C<$eol>) has been read. This line (excluding the end of line	1186	line marker, C<$eol>) has been read. This line (excluding the end of line
835	marker) will be passed to the callback as second argument (C<$line>), and	1187	marker) will be passed to the callback as second argument (C<$line>), and
…		…
850	=cut	1202	=cut
851		1203
852	register_read_type line => sub {	1204	register_read_type line => sub {
853	my ($self, $cb, $eol) = @_;	1205	my ($self, $cb, $eol) = @_;
854		1206
855	$eol = qr|(\015?\012)| if @_ < 3;	1207	if (@_ < 3) {
		1208	# this is more than twice as fast as the generic code below
		1209	sub {
		1210	$_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return;
		1211
		1212	$cb->($_[0], $1, $2);
		1213	1
		1214	}
		1215	} else {
856	$eol = quotemeta $eol unless ref $eol;	1216	$eol = quotemeta $eol unless ref $eol;
857	$eol = qr|^(.*?)($eol)|s;	1217	$eol = qr|^(.*?)($eol)|s;
858		1218
859	sub {	1219	sub {
860	$_[0]{rbuf} =~ s/$eol// or return;	1220	$_[0]{rbuf} =~ s/$eol// or return;
861		1221
862	$cb->($_[0], $1, $2);	1222	$cb->($_[0], $1, $2);
		1223	1
863	1	1224	}
864	}	1225	}
865	};	1226	};
866
867	# compatibility with older API
868	sub push_read_line {
869	my $self = shift;
870	$self->push_read (line => @_);
871	}
872
873	sub unshift_read_line {
874	my $self = shift;
875	$self->unshift_read (line => @_);
876	}
877		1227
878	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)	1228	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)
879		1229
880	Makes a regex match against the regex object C<$accept> and returns	1230	Makes a regex match against the regex object C<$accept> and returns
881	everything up to and including the match.	1231	everything up to and including the match.
…		…
931	return 1;	1281	return 1;
932	}	1282	}
933		1283
934	# reject	1284	# reject
935	if ($reject && $$rbuf =~ $reject) {	1285	if ($reject && $$rbuf =~ $reject) {
936	$self->_error (&Errno::EBADMSG);	1286	$self->_error (Errno::EBADMSG);
937	}	1287	}
938		1288
939	# skip	1289	# skip
940	if ($skip && $$rbuf =~ $skip) {	1290	if ($skip && $$rbuf =~ $skip) {
941	$data .= substr $$rbuf, 0, $+[0], "";	1291	$data .= substr $$rbuf, 0, $+[0], "";
…		…
957	my ($self, $cb) = @_;	1307	my ($self, $cb) = @_;
958		1308
959	sub {	1309	sub {
960	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {	1310	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {
961	if ($_[0]{rbuf} =~ /[^0-9]/) {	1311	if ($_[0]{rbuf} =~ /[^0-9]/) {
962	$self->_error (&Errno::EBADMSG);	1312	$self->_error (Errno::EBADMSG);
963	}	1313	}
964	return;	1314	return;
965	}	1315	}
966		1316
967	my $len = $1;	1317	my $len = $1;
…		…
970	my $string = $_[1];	1320	my $string = $_[1];
971	$_[0]->unshift_read (chunk => 1, sub {	1321	$_[0]->unshift_read (chunk => 1, sub {
972	if ($_[1] eq ",") {	1322	if ($_[1] eq ",") {
973	$cb->($_[0], $string);	1323	$cb->($_[0], $string);
974	} else {	1324	} else {
975	$self->_error (&Errno::EBADMSG);	1325	$self->_error (Errno::EBADMSG);
976	}	1326	}
977	});	1327	});
978	});	1328	});
979		1329
980	1	1330	1
…		…
986	An octet string prefixed with an encoded length. The encoding C<$format>	1336	An octet string prefixed with an encoded length. The encoding C<$format>
987	uses the same format as a Perl C<pack> format, but must specify a single	1337	uses the same format as a Perl C<pack> format, but must specify a single
988	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an	1338	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
989	optional C<!>, C<< < >> or C<< > >> modifier).	1339	optional C<!>, C<< < >> or C<< > >> modifier).
990		1340
991	DNS over TCP uses a prefix of C<n>, EPP uses a prefix of C<N>.	1341	For example, DNS over TCP uses a prefix of C<n> (2 octet network order),
		1342	EPP uses a prefix of C<N> (4 octtes).
992		1343
993	Example: read a block of data prefixed by its length in BER-encoded	1344	Example: read a block of data prefixed by its length in BER-encoded
994	format (very efficient).	1345	format (very efficient).
995		1346
996	$handle->push_read (packstring => "w", sub {	1347	$handle->push_read (packstring => "w", sub {
…		…
1002	register_read_type packstring => sub {	1353	register_read_type packstring => sub {
1003	my ($self, $cb, $format) = @_;	1354	my ($self, $cb, $format) = @_;
1004		1355
1005	sub {	1356	sub {
1006	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method	1357	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method
1007	defined (my $len = eval { unpack $format, $_[0]->{rbuf} })	1358	defined (my $len = eval { unpack $format, $_[0]{rbuf} })
1008	or return;	1359	or return;
1009		1360
		1361	$format = length pack $format, $len;
		1362
		1363	# bypass unshift if we already have the remaining chunk
		1364	if ($format + $len <= length $_[0]{rbuf}) {
		1365	my $data = substr $_[0]{rbuf}, $format, $len;
		1366	substr $_[0]{rbuf}, 0, $format + $len, "";
		1367	$cb->($_[0], $data);
		1368	} else {
1010	# remove prefix	1369	# remove prefix
1011	substr $_[0]->{rbuf}, 0, (length pack $format, $len), "";	1370	substr $_[0]{rbuf}, 0, $format, "";
1012		1371
1013	# read rest	1372	# read remaining chunk
1014	$_[0]->unshift_read (chunk => $len, $cb);	1373	$_[0]->unshift_read (chunk => $len, $cb);
		1374	}
1015		1375
1016	1	1376	1
1017	}	1377	}
1018	};	1378	};
1019		1379
1020	=item json => $cb->($handle, $hash_or_arrayref)	1380	=item json => $cb->($handle, $hash_or_arrayref)
1021		1381
1022	Reads a JSON object or array, decodes it and passes it to the callback.	1382	Reads a JSON object or array, decodes it and passes it to the
		1383	callback. When a parse error occurs, an C<EBADMSG> error will be raised.
1023		1384
1024	If a C<json> object was passed to the constructor, then that will be used	1385	If a C<json> object was passed to the constructor, then that will be used
1025	for the final decode, otherwise it will create a JSON coder expecting UTF-8.	1386	for the final decode, otherwise it will create a JSON coder expecting UTF-8.
1026		1387
1027	This read type uses the incremental parser available with JSON version	1388	This read type uses the incremental parser available with JSON version
…		…
1034	the C<json> write type description, above, for an actual example.	1395	the C<json> write type description, above, for an actual example.
1035		1396
1036	=cut	1397	=cut
1037		1398
1038	register_read_type json => sub {	1399	register_read_type json => sub {
1039	my ($self, $cb, $accept, $reject, $skip) = @_;	1400	my ($self, $cb) = @_;
1040		1401
1041	require JSON;	1402	my $json = $self->{json} ||=
		1403	eval { require JSON::XS; JSON::XS->new->utf8 }
		1404	|| do { require JSON; JSON->new->utf8 };
1042		1405
1043	my $data;	1406	my $data;
1044	my $rbuf = \$self->{rbuf};	1407	my $rbuf = \$self->{rbuf};
1045		1408
1046	my $json = $self->{json} ||= JSON->new->utf8;
1047
1048	sub {	1409	sub {
1049	my $ref = $json->incr_parse ($self->{rbuf});	1410	my $ref = eval { $json->incr_parse ($self->{rbuf}) };
1050		1411
1051	if ($ref) {	1412	if ($ref) {
1052	$self->{rbuf} = $json->incr_text;	1413	$self->{rbuf} = $json->incr_text;
1053	$json->incr_text = "";	1414	$json->incr_text = "";
1054	$cb->($self, $ref);	1415	$cb->($self, $ref);
1055		1416
1056	1	1417	1
		1418	} elsif ($@) {
		1419	# error case
		1420	$json->incr_skip;
		1421
		1422	$self->{rbuf} = $json->incr_text;
		1423	$json->incr_text = "";
		1424
		1425	$self->_error (Errno::EBADMSG);
		1426
		1427	()
1057	} else {	1428	} else {
1058	$self->{rbuf} = "";	1429	$self->{rbuf} = "";
		1430
1059	()	1431	()
1060	}	1432	}
		1433	}
		1434	};
		1435
		1436	=item storable => $cb->($handle, $ref)
		1437
		1438	Deserialises a L<Storable> frozen representation as written by the
		1439	C<storable> write type (BER-encoded length prefix followed by nfreeze'd
		1440	data).
		1441
		1442	Raises C<EBADMSG> error if the data could not be decoded.
		1443
		1444	=cut
		1445
		1446	register_read_type storable => sub {
		1447	my ($self, $cb) = @_;
		1448
		1449	require Storable;
		1450
		1451	sub {
		1452	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method
		1453	defined (my $len = eval { unpack "w", $_[0]{rbuf} })
		1454	or return;
		1455
		1456	my $format = length pack "w", $len;
		1457
		1458	# bypass unshift if we already have the remaining chunk
		1459	if ($format + $len <= length $_[0]{rbuf}) {
		1460	my $data = substr $_[0]{rbuf}, $format, $len;
		1461	substr $_[0]{rbuf}, 0, $format + $len, "";
		1462	$cb->($_[0], Storable::thaw ($data));
		1463	} else {
		1464	# remove prefix
		1465	substr $_[0]{rbuf}, 0, $format, "";
		1466
		1467	# read remaining chunk
		1468	$_[0]->unshift_read (chunk => $len, sub {
		1469	if (my $ref = eval { Storable::thaw ($_[1]) }) {
		1470	$cb->($_[0], $ref);
		1471	} else {
		1472	$self->_error (Errno::EBADMSG);
		1473	}
		1474	});
		1475	}
		1476
		1477	1
1061	}	1478	}
1062	};	1479	};
1063		1480
1064	=back	1481	=back
1065		1482
…		…
1095	Note that AnyEvent::Handle will automatically C<start_read> for you when	1512	Note that AnyEvent::Handle will automatically C<start_read> for you when
1096	you change the C<on_read> callback or push/unshift a read callback, and it	1513	you change the C<on_read> callback or push/unshift a read callback, and it
1097	will automatically C<stop_read> for you when neither C<on_read> is set nor	1514	will automatically C<stop_read> for you when neither C<on_read> is set nor
1098	there are any read requests in the queue.	1515	there are any read requests in the queue.
1099		1516
		1517	These methods will have no effect when in TLS mode (as TLS doesn't support
		1518	half-duplex connections).
		1519
1100	=cut	1520	=cut
1101		1521
1102	sub stop_read {	1522	sub stop_read {
1103	my ($self) = @_;	1523	my ($self) = @_;
1104		1524
1105	delete $self->{_rw};	1525	delete $self->{_rw} unless $self->{tls};
1106	}	1526	}
1107		1527
1108	sub start_read {	1528	sub start_read {
1109	my ($self) = @_;	1529	my ($self) = @_;
1110		1530
1111	unless ($self->{_rw} || $self->{_eof}) {	1531	unless ($self->{_rw} || $self->{_eof}) {
1112	Scalar::Util::weaken $self;	1532	Scalar::Util::weaken $self;
1113		1533
1114	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1534	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
1115	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1535	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1116	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;	1536	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;
1117		1537
1118	if ($len > 0) {	1538	if ($len > 0) {
1119	$self->{_activity} = AnyEvent->now;	1539	$self->{_activity} = AnyEvent->now;
1120		1540
1121	$self->{filter_r}	1541	if ($self->{tls}) {
1122	? $self->{filter_r}($self, $rbuf)	1542	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1123	: $self->{_in_drain} || $self->_drain_rbuf;	1543
		1544	&_dotls ($self);
		1545	} else {
		1546	$self->_drain_rbuf;
		1547	}
1124		1548
1125	} elsif (defined $len) {	1549	} elsif (defined $len) {
1126	delete $self->{_rw};	1550	delete $self->{_rw};
1127	$self->{_eof} = 1;	1551	$self->{_eof} = 1;
1128	$self->_drain_rbuf unless $self->{_in_drain};	1552	$self->_drain_rbuf;
1129		1553
1130	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	1554	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
1131	return $self->_error ($!, 1);	1555	return $self->_error ($!, 1);
1132	}	1556	}
1133	});	1557	});
1134	}	1558	}
1135	}	1559	}
1136		1560
		1561	our $ERROR_SYSCALL;
		1562	our $ERROR_WANT_READ;
		1563
		1564	sub _tls_error {
		1565	my ($self, $err) = @_;
		1566
		1567	return $self->_error ($!, 1)
		1568	if $err == Net::SSLeay::ERROR_SYSCALL ();
		1569
		1570	my $err =Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ());
		1571
		1572	# reduce error string to look less scary
		1573	$err =~ s/^error:[0-9a-fA-F]{8}:[^:]+:([^:]+):/\L$1: /;
		1574
		1575	if ($self->{_on_starttls}) {
		1576	(delete $self->{_on_starttls})->($self, undef, $err);
		1577	&_freetls;
		1578	} else {
		1579	&_freetls;
		1580	$self->_error (Errno::EPROTO, 1, $err);
		1581	}
		1582	}
		1583
		1584	# poll the write BIO and send the data if applicable
		1585	# also decode read data if possible
		1586	# this is basiclaly our TLS state machine
		1587	# more efficient implementations are possible with openssl,
		1588	# but not with the buggy and incomplete Net::SSLeay.
1137	sub _dotls {	1589	sub _dotls {
1138	my ($self) = @_;	1590	my ($self) = @_;
1139		1591
1140	my $buf;	1592	my $tmp;
1141		1593
1142	if (length $self->{_tls_wbuf}) {	1594	if (length $self->{_tls_wbuf}) {
1143	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1595	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1144	substr $self->{_tls_wbuf}, 0, $len, "";	1596	substr $self->{_tls_wbuf}, 0, $tmp, "";
1145	}	1597	}
1146	}
1147		1598
		1599	$tmp = Net::SSLeay::get_error ($self->{tls}, $tmp);
		1600	return $self->_tls_error ($tmp)
		1601	if $tmp != $ERROR_WANT_READ
		1602	&& ($tmp != $ERROR_SYSCALL || $!);
		1603	}
		1604
		1605	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
		1606	unless (length $tmp) {
		1607	$self->{_on_starttls}
		1608	and (delete $self->{_on_starttls})->($self, undef, "EOF during handshake"); # ???
		1609	&_freetls;
		1610
		1611	if ($self->{on_stoptls}) {
		1612	$self->{on_stoptls}($self);
		1613	return;
		1614	} else {
		1615	# let's treat SSL-eof as we treat normal EOF
		1616	delete $self->{_rw};
		1617	$self->{_eof} = 1;
		1618	}
		1619	}
		1620
		1621	$self->{_tls_rbuf} .= $tmp;
		1622	$self->_drain_rbuf;
		1623	$self->{tls} or return; # tls session might have gone away in callback
		1624	}
		1625
		1626	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
		1627	return $self->_tls_error ($tmp)
		1628	if $tmp != $ERROR_WANT_READ
		1629	&& ($tmp != $ERROR_SYSCALL || $!);
		1630
1148	if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {	1631	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1149	$self->{wbuf} .= $buf;	1632	$self->{wbuf} .= $tmp;
1150	$self->_drain_wbuf;	1633	$self->_drain_wbuf;
1151	}	1634	}
1152		1635
1153	while (defined ($buf = Net::SSLeay::read ($self->{tls}))) {	1636	$self->{_on_starttls}
1154	if (length $buf) {	1637	and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK ()
1155	$self->{rbuf} .= $buf;	1638	and (delete $self->{_on_starttls})->($self, 1, "TLS/SSL connection established");
1156	$self->_drain_rbuf unless $self->{_in_drain};
1157	} else {
1158	# let's treat SSL-eof as we treat normal EOF
1159	$self->{_eof} = 1;
1160	$self->_shutdown;
1161	return;
1162	}
1163	}
1164
1165	my $err = Net::SSLeay::get_error ($self->{tls}, -1);
1166
1167	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {
1168	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {
1169	return $self->_error ($!, 1);
1170	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {
1171	return $self->_error (&Errno::EIO, 1);
1172	}
1173
1174	# all others are fine for our purposes
1175	}
1176	}	1639	}
1177		1640
1178	=item $handle->starttls ($tls[, $tls_ctx])	1641	=item $handle->starttls ($tls[, $tls_ctx])
1179		1642
1180	Instead of starting TLS negotiation immediately when the AnyEvent::Handle	1643	Instead of starting TLS negotiation immediately when the AnyEvent::Handle
1181	object is created, you can also do that at a later time by calling	1644	object is created, you can also do that at a later time by calling
1182	C<starttls>.	1645	C<starttls>.
1183		1646
		1647	Starting TLS is currently an asynchronous operation - when you push some
		1648	write data and then call C<< ->starttls >> then TLS negotiation will start
		1649	immediately, after which the queued write data is then sent.
		1650
1184	The first argument is the same as the C<tls> constructor argument (either	1651	The first argument is the same as the C<tls> constructor argument (either
1185	C<"connect">, C<"accept"> or an existing Net::SSLeay object).	1652	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
1186		1653
1187	The second argument is the optional C<Net::SSLeay::CTX> object that is	1654	The second argument is the optional C<AnyEvent::TLS> object that is used
1188	used when AnyEvent::Handle has to create its own TLS connection object.	1655	when AnyEvent::Handle has to create its own TLS connection object, or
		1656	a hash reference with C<< key => value >> pairs that will be used to
		1657	construct a new context.
1189		1658
1190	The TLS connection object will end up in C<< $handle->{tls} >> after this	1659	The TLS connection object will end up in C<< $handle->{tls} >>, the TLS
1191	call and can be used or changed to your liking. Note that the handshake	1660	context in C<< $handle->{tls_ctx} >> after this call and can be used or
1192	might have already started when this function returns.	1661	changed to your liking. Note that the handshake might have already started
		1662	when this function returns.
1193		1663
		1664	Due to bugs in OpenSSL, it might or might not be possible to do multiple
		1665	handshakes on the same stream. Best do not attempt to use the stream after
		1666	stopping TLS.
		1667
1194	=cut	1668	=cut
		1669
		1670	our %TLS_CACHE; #TODO not yet documented, should we?
1195		1671
1196	sub starttls {	1672	sub starttls {
1197	my ($self, $ssl, $ctx) = @_;	1673	my ($self, $tls, $ctx) = @_;
1198		1674
1199	$self->stoptls;	1675	Carp::croak "It is an error to call starttls on an AnyEvent::Handle object while TLS is already active, caught"
		1676	if $self->{tls};
1200		1677
1201	if ($ssl eq "accept") {	1678	$self->{tls} = $tls;
1202	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());	1679	$self->{tls_ctx} = $ctx if @_ > 2;
1203	Net::SSLeay::set_accept_state ($ssl);	1680
1204	} elsif ($ssl eq "connect") {	1681	return unless $self->{fh};
1205	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());	1682
1206	Net::SSLeay::set_connect_state ($ssl);	1683	require Net::SSLeay;
		1684
		1685	$ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL ();
		1686	$ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ ();
		1687
		1688	$tls = $self->{tls};
		1689	$ctx = $self->{tls_ctx};
		1690
		1691	local $Carp::CarpLevel = 1; # skip ourselves when creating a new context or session
		1692
		1693	if ("HASH" eq ref $ctx) {
		1694	require AnyEvent::TLS;
		1695
		1696	if ($ctx->{cache}) {
		1697	my $key = $ctx+0;
		1698	$ctx = $TLS_CACHE{$key} ||= new AnyEvent::TLS %$ctx;
		1699	} else {
		1700	$ctx = new AnyEvent::TLS %$ctx;
		1701	}
		1702	}
1207	}	1703
1208		1704	$self->{tls_ctx} = $ctx || TLS_CTX ();
1209	$self->{tls} = $ssl;	1705	$self->{tls} = $tls = $self->{tls_ctx}->_get_session ($tls, $self, $self->{peername});
1210		1706
1211	# basically, this is deep magic (because SSL_read should have the same issues)	1707	# basically, this is deep magic (because SSL_read should have the same issues)
1212	# but the openssl maintainers basically said: "trust us, it just works".	1708	# but the openssl maintainers basically said: "trust us, it just works".
1213	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1709	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1214	# and mismaintained ssleay-module doesn't even offer them).	1710	# and mismaintained ssleay-module doesn't even offer them).
1215	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html	1711	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
		1712	#
		1713	# in short: this is a mess.
		1714	#
		1715	# note that we do not try to keep the length constant between writes as we are required to do.
		1716	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
		1717	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
		1718	# have identity issues in that area.
1216	Net::SSLeay::CTX_set_mode ($self->{tls},	1719	# Net::SSLeay::CTX_set_mode ($ssl,
1217	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)	1720	# (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)
1218	| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));	1721	# | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));
		1722	Net::SSLeay::CTX_set_mode ($tls, 1|2);
1219		1723
1220	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1724	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1221	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1725	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1222		1726
1223	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	1727	Net::SSLeay::set_bio ($tls, $self->{_rbio}, $self->{_wbio});
1224		1728
1225	$self->{filter_w} = sub {	1729	$self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) }
1226	$_[0]{_tls_wbuf} .= ${$_[1]};	1730	if $self->{on_starttls};
1227	&_dotls;	1731
1228	};	1732	&_dotls; # need to trigger the initial handshake
1229	$self->{filter_r} = sub {	1733	$self->start_read; # make sure we actually do read
1230	Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]});
1231	&_dotls;
1232	};
1233	}	1734	}
1234		1735
1235	=item $handle->stoptls	1736	=item $handle->stoptls
1236		1737
1237	Destroys the SSL connection, if any. Partial read or write data will be	1738	Shuts down the SSL connection - this makes a proper EOF handshake by
1238	lost.	1739	sending a close notify to the other side, but since OpenSSL doesn't
		1740	support non-blocking shut downs, it is not guarenteed that you can re-use
		1741	the stream afterwards.
1239		1742
1240	=cut	1743	=cut
1241		1744
1242	sub stoptls {	1745	sub stoptls {
1243	my ($self) = @_;	1746	my ($self) = @_;
1244		1747
1245	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};	1748	if ($self->{tls}) {
		1749	Net::SSLeay::shutdown ($self->{tls});
1246		1750
1247	delete $self->{_rbio};	1751	&_dotls;
1248	delete $self->{_wbio};	1752
1249	delete $self->{_tls_wbuf};	1753	# # we don't give a shit. no, we do, but we can't. no...#d#
1250	delete $self->{filter_r};	1754	# # we, we... have to use openssl :/#d#
1251	delete $self->{filter_w};	1755	# &_freetls;#d#
		1756	}
		1757	}
		1758
		1759	sub _freetls {
		1760	my ($self) = @_;
		1761
		1762	return unless $self->{tls};
		1763
		1764	$self->{tls_ctx}->_put_session (delete $self->{tls})
		1765	if ref $self->{tls};
		1766
		1767	delete @$self{qw(_rbio _wbio _tls_wbuf _on_starttls)};
1252	}	1768	}
1253		1769
1254	sub DESTROY {	1770	sub DESTROY {
1255	my $self = shift;	1771	my ($self) = @_;
1256		1772
1257	$self->stoptls;	1773	&_freetls;
		1774
		1775	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
		1776
		1777	if ($linger && length $self->{wbuf} && $self->{fh}) {
		1778	my $fh = delete $self->{fh};
		1779	my $wbuf = delete $self->{wbuf};
		1780
		1781	my @linger;
		1782
		1783	push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub {
		1784	my $len = syswrite $fh, $wbuf, length $wbuf;
		1785
		1786	if ($len > 0) {
		1787	substr $wbuf, 0, $len, "";
		1788	} else {
		1789	@linger = (); # end
		1790	}
		1791	});
		1792	push @linger, AnyEvent->timer (after => $linger, cb => sub {
		1793	@linger = ();
		1794	});
		1795	}
		1796	}
		1797
		1798	=item $handle->destroy
		1799
		1800	Shuts down the handle object as much as possible - this call ensures that
		1801	no further callbacks will be invoked and as many resources as possible
		1802	will be freed. Any method you will call on the handle object after
		1803	destroying it in this way will be silently ignored (and it will return the
		1804	empty list).
		1805
		1806	Normally, you can just "forget" any references to an AnyEvent::Handle
		1807	object and it will simply shut down. This works in fatal error and EOF
		1808	callbacks, as well as code outside. It does I<NOT> work in a read or write
		1809	callback, so when you want to destroy the AnyEvent::Handle object from
		1810	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
		1811	that case.
		1812
		1813	Destroying the handle object in this way has the advantage that callbacks
		1814	will be removed as well, so if those are the only reference holders (as
		1815	is common), then one doesn't need to do anything special to break any
		1816	reference cycles.
		1817
		1818	The handle might still linger in the background and write out remaining
		1819	data, as specified by the C<linger> option, however.
		1820
		1821	=cut
		1822
		1823	sub destroy {
		1824	my ($self) = @_;
		1825
		1826	$self->DESTROY;
		1827	%$self = ();
		1828	bless $self, "AnyEvent::Handle::destroyed";
		1829	}
		1830
		1831	sub AnyEvent::Handle::destroyed::AUTOLOAD {
		1832	#nop
1258	}	1833	}
1259		1834
1260	=item AnyEvent::Handle::TLS_CTX	1835	=item AnyEvent::Handle::TLS_CTX
1261		1836
1262	This function creates and returns the Net::SSLeay::CTX object used by	1837	This function creates and returns the AnyEvent::TLS object used by default
1263	default for TLS mode.	1838	for TLS mode.
1264		1839
1265	The context is created like this:	1840	The context is created by calling L<AnyEvent::TLS> without any arguments.
1266
1267	Net::SSLeay::load_error_strings;
1268	Net::SSLeay::SSLeay_add_ssl_algorithms;
1269	Net::SSLeay::randomize;
1270
1271	my $CTX = Net::SSLeay::CTX_new;
1272
1273	Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL
1274		1841
1275	=cut	1842	=cut
1276		1843
1277	our $TLS_CTX;	1844	our $TLS_CTX;
1278		1845
1279	sub TLS_CTX() {	1846	sub TLS_CTX() {
1280	$TLS_CTX || do {	1847	$TLS_CTX ||= do {
1281	require Net::SSLeay;	1848	require AnyEvent::TLS;
1282		1849
1283	Net::SSLeay::load_error_strings ();	1850	new AnyEvent::TLS
1284	Net::SSLeay::SSLeay_add_ssl_algorithms ();
1285	Net::SSLeay::randomize ();
1286
1287	$TLS_CTX = Net::SSLeay::CTX_new ();
1288
1289	Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ());
1290
1291	$TLS_CTX
1292	}	1851	}
1293	}	1852	}
1294		1853
1295	=back	1854	=back
		1855
		1856
		1857	=head1 NONFREQUENTLY ASKED QUESTIONS
		1858
		1859	=over 4
		1860
		1861	=item I C<undef> the AnyEvent::Handle reference inside my callback and
		1862	still get further invocations!
		1863
		1864	That's because AnyEvent::Handle keeps a reference to itself when handling
		1865	read or write callbacks.
		1866
		1867	It is only safe to "forget" the reference inside EOF or error callbacks,
		1868	from within all other callbacks, you need to explicitly call the C<<
		1869	->destroy >> method.
		1870
		1871	=item I get different callback invocations in TLS mode/Why can't I pause
		1872	reading?
		1873
		1874	Unlike, say, TCP, TLS connections do not consist of two independent
		1875	communication channels, one for each direction. Or put differently. The
		1876	read and write directions are not independent of each other: you cannot
		1877	write data unless you are also prepared to read, and vice versa.
		1878
		1879	This can mean than, in TLS mode, you might get C<on_error> or C<on_eof>
		1880	callback invocations when you are not expecting any read data - the reason
		1881	is that AnyEvent::Handle always reads in TLS mode.
		1882
		1883	During the connection, you have to make sure that you always have a
		1884	non-empty read-queue, or an C<on_read> watcher. At the end of the
		1885	connection (or when you no longer want to use it) you can call the
		1886	C<destroy> method.
		1887
		1888	=item How do I read data until the other side closes the connection?
		1889
		1890	If you just want to read your data into a perl scalar, the easiest way
		1891	to achieve this is by setting an C<on_read> callback that does nothing,
		1892	clearing the C<on_eof> callback and in the C<on_error> callback, the data
		1893	will be in C<$_[0]{rbuf}>:
		1894
		1895	$handle->on_read (sub { });
		1896	$handle->on_eof (undef);
		1897	$handle->on_error (sub {
		1898	my $data = delete $_[0]{rbuf};
		1899	});
		1900
		1901	The reason to use C<on_error> is that TCP connections, due to latencies
		1902	and packets loss, might get closed quite violently with an error, when in
		1903	fact, all data has been received.
		1904
		1905	It is usually better to use acknowledgements when transferring data,
		1906	to make sure the other side hasn't just died and you got the data
		1907	intact. This is also one reason why so many internet protocols have an
		1908	explicit QUIT command.
		1909
		1910	=item I don't want to destroy the handle too early - how do I wait until
		1911	all data has been written?
		1912
		1913	After writing your last bits of data, set the C<on_drain> callback
		1914	and destroy the handle in there - with the default setting of
		1915	C<low_water_mark> this will be called precisely when all data has been
		1916	written to the socket:
		1917
		1918	$handle->push_write (...);
		1919	$handle->on_drain (sub {
		1920	warn "all data submitted to the kernel\n";
		1921	undef $handle;
		1922	});
		1923
		1924	If you just want to queue some data and then signal EOF to the other side,
		1925	consider using C<< ->push_shutdown >> instead.
		1926
		1927	=item I want to contact a TLS/SSL server, I don't care about security.
		1928
		1929	If your TLS server is a pure TLS server (e.g. HTTPS) that only speaks TLS,
		1930	simply connect to it and then create the AnyEvent::Handle with the C<tls>
		1931	parameter:
		1932
		1933	tcp_connect $host, $port, sub {
		1934	my ($fh) = @_;
		1935
		1936	my $handle = new AnyEvent::Handle
		1937	fh => $fh,
		1938	tls => "connect",
		1939	on_error => sub { ... };
		1940
		1941	$handle->push_write (...);
		1942	};
		1943
		1944	=item I want to contact a TLS/SSL server, I do care about security.
		1945
		1946	Then you should additionally enable certificate verification, including
		1947	peername verification, if the protocol you use supports it (see
		1948	L<AnyEvent::TLS>, C<verify_peername>).
		1949
		1950	E.g. for HTTPS:
		1951
		1952	tcp_connect $host, $port, sub {
		1953	my ($fh) = @_;
		1954
		1955	my $handle = new AnyEvent::Handle
		1956	fh => $fh,
		1957	peername => $host,
		1958	tls => "connect",
		1959	tls_ctx => { verify => 1, verify_peername => "https" },
		1960	...
		1961
		1962	Note that you must specify the hostname you connected to (or whatever
		1963	"peername" the protocol needs) as the C<peername> argument, otherwise no
		1964	peername verification will be done.
		1965
		1966	The above will use the system-dependent default set of trusted CA
		1967	certificates. If you want to check against a specific CA, add the
		1968	C<ca_file> (or C<ca_cert>) arguments to C<tls_ctx>:
		1969
		1970	tls_ctx => {
		1971	verify => 1,
		1972	verify_peername => "https",
		1973	ca_file => "my-ca-cert.pem",
		1974	},
		1975
		1976	=item I want to create a TLS/SSL server, how do I do that?
		1977
		1978	Well, you first need to get a server certificate and key. You have
		1979	three options: a) ask a CA (buy one, use cacert.org etc.) b) create a
		1980	self-signed certificate (cheap. check the search engine of your choice,
		1981	there are many tutorials on the net) or c) make your own CA (tinyca2 is a
		1982	nice program for that purpose).
		1983
		1984	Then create a file with your private key (in PEM format, see
		1985	L<AnyEvent::TLS>), followed by the certificate (also in PEM format). The
		1986	file should then look like this:
		1987
		1988	-----BEGIN RSA PRIVATE KEY-----
		1989	...header data
		1990	... lots of base64'y-stuff
		1991	-----END RSA PRIVATE KEY-----
		1992
		1993	-----BEGIN CERTIFICATE-----
		1994	... lots of base64'y-stuff
		1995	-----END CERTIFICATE-----
		1996
		1997	The important bits are the "PRIVATE KEY" and "CERTIFICATE" parts. Then
		1998	specify this file as C<cert_file>:
		1999
		2000	tcp_server undef, $port, sub {
		2001	my ($fh) = @_;
		2002
		2003	my $handle = new AnyEvent::Handle
		2004	fh => $fh,
		2005	tls => "accept",
		2006	tls_ctx => { cert_file => "my-server-keycert.pem" },
		2007	...
		2008
		2009	When you have intermediate CA certificates that your clients might not
		2010	know about, just append them to the C<cert_file>.
		2011
		2012	=back
		2013
1296		2014
1297	=head1 SUBCLASSING AnyEvent::Handle	2015	=head1 SUBCLASSING AnyEvent::Handle
1298		2016
1299	In many cases, you might want to subclass AnyEvent::Handle.	2017	In many cases, you might want to subclass AnyEvent::Handle.
1300		2018
…		…
1304	=over 4	2022	=over 4
1305		2023
1306	=item * all constructor arguments become object members.	2024	=item * all constructor arguments become object members.
1307		2025
1308	At least initially, when you pass a C<tls>-argument to the constructor it	2026	At least initially, when you pass a C<tls>-argument to the constructor it
1309	will end up in C<< $handle->{tls} >>. Those members might be changes or	2027	will end up in C<< $handle->{tls} >>. Those members might be changed or
1310	mutated later on (for example C<tls> will hold the TLS connection object).	2028	mutated later on (for example C<tls> will hold the TLS connection object).
1311		2029
1312	=item * other object member names are prefixed with an C<_>.	2030	=item * other object member names are prefixed with an C<_>.
1313		2031
1314	All object members not explicitly documented (internal use) are prefixed	2032	All object members not explicitly documented (internal use) are prefixed

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