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Revision 1.56 by root, Wed Jun 4 09:55:16 2008 UTC vs.
Revision 1.162 by root, Sun Jul 26 00:17:25 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 = 4.12;	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
107	=item on_read => $cb->($handle)	168	=item on_read => $cb->($handle)
108		169
109	This sets the default read callback, which is called when data arrives	170	This sets the default read callback, which is called when data arrives
110	and no read request is in the queue.	171	and no read request is in the queue (unlike read queue callbacks, this
		172	callback will only be called when at least one octet of data is in the
		173	read buffer).
111		174
112	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 >>
113	method or access the C<$handle->{rbuf}> member directly.	176	method or access the C<< $handle->{rbuf} >> member directly. Note that you
		177	must not enlarge or modify the read buffer, you can only remove data at
		178	the beginning from it.
114		179
115	When an EOF condition is detected then AnyEvent::Handle will first try to	180	When an EOF condition is detected then AnyEvent::Handle will first try to
116	feed all the remaining data to the queued callbacks and C<on_read> before	181	feed all the remaining data to the queued callbacks and C<on_read> before
117	calling the C<on_eof> callback. If no progress can be made, then a fatal	182	calling the C<on_eof> callback. If no progress can be made, then a fatal
118	error will be raised (with C<$!> set to C<EPIPE>).	183	error will be raised (with C<$!> set to C<EPIPE>).
119		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
120	=item on_drain => $cb->($handle)	206	=item on_drain => $cb->($handle)
121		207
122	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
123	(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).
124		210
125	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.
126		218
127	=item timeout => $fractional_seconds	219	=item timeout => $fractional_seconds
128		220
129	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
130	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
131	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
132	missing, an C<ETIMEDOUT> error will be raised).	224	missing, a non-fatal C<ETIMEDOUT> error will be raised).
133		225
134	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
135	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
136	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
137	in the C<on_timeout> callback.	229	in the C<on_timeout> callback, in which case AnyEvent::Handle will simply
		230	restart the timeout.
138		231
139	Zero (the default) disables this timeout.	232	Zero (the default) disables this timeout.
140		233
141	=item on_timeout => $cb->($handle)	234	=item on_timeout => $cb->($handle)
142		235
…		…
146		239
147	=item rbuf_max => <bytes>	240	=item rbuf_max => <bytes>
148		241
149	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>)
150	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
151	avoid denial-of-service attacks.	244	avoid some forms of denial-of-service attacks.
152		245
153	For example, a server accepting connections from untrusted sources should	246	For example, a server accepting connections from untrusted sources should
154	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
155	(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
156	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
157	isn't finished).	250	isn't finished).
158		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
159	=item read_size => <bytes>	278	=item read_size => <bytes>
160		279
161	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
162	during each (loop iteration). Default: C<8192>.	281	try to read during each loop iteration, which affects memory
		282	requirements). Default: C<8192>.
163		283
164	=item low_water_mark => <bytes>	284	=item low_water_mark => <bytes>
165		285
166	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
167	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
168	considered empty.	288	considered empty.
169		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
170	=item tls => "accept" | "connect" | Net::SSLeay::SSL object	317	=item tls => "accept" | "connect" | Net::SSLeay::SSL object
171		318
172	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
173	will start making tls handshake and will transparently encrypt/decrypt	320	AnyEvent will start a TLS handshake as soon as the conenction has been
174	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.
175		325
176	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
177	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.
178		330
179	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
180	connection, use C<connect> mode.	332	C<accept>, and for the TLS client side of a connection, use C<connect>
		333	mode.
181		334
182	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
183	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>
184	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
185	AnyEvent::Handle.	338	AnyEvent::Handle. Also, this module will take ownership of this connection
		339	object.
186		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
187	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.
188		351
189	=item tls_ctx => $ssl_ctx	352	=item tls_ctx => $anyevent_tls
190		353
191	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
192	(unless a connection object was specified directly). If this parameter is	355	(unless a connection object was specified directly). If this parameter is
193	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	356	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
194		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
195	=item json => JSON or JSON::XS object	394	=item json => JSON or JSON::XS object
196		395
197	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.
198		397
199	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
200	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.
201		401
202	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
203	use this functionality, as AnyEvent does not have a dependency itself.	403	use this functionality, as AnyEvent does not have a dependency itself.
204		404
205	=item filter_r => $cb
206
207	=item filter_w => $cb
208
209	These exist, but are undocumented at this time.
210
211	=back	405	=back
212		406
213	=cut	407	=cut
214		408
215	sub new {	409	sub new {
216	my $class = shift;	410	my $class = shift;
217
218	my $self = bless { @_ }, $class;	411	my $self = bless { @_ }, $class;
219		412
220	$self->{fh} or Carp::croak "mandatory argument fh is missing";	413	if ($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) = @_;
221		476
222	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	477	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
223
224	if ($self->{tls}) {
225	require Net::SSLeay;
226	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});
227	}
228
229	# $self->on_eof (delete $self->{on_eof} ) if $self->{on_eof}; # nop
230	# $self->on_error (delete $self->{on_error}) if $self->{on_error}; # nop
231	# $self->on_read (delete $self->{on_read} ) if $self->{on_read}; # nop
232	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};
233		478
234	$self->{_activity} = AnyEvent->now;	479	$self->{_activity} = AnyEvent->now;
235	$self->_timeout;	480	$self->_timeout;
236		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
		487	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};
		488
237	$self->start_read;	489	$self->start_read
		490	if $self->{on_read} || @{ $self->{_queue} };
238		491
239	$self	492	$self->_drain_wbuf;
240	}	493	}
241		494
242	sub _shutdown {	495	#sub _shutdown {
243	my ($self) = @_;	496	# my ($self) = @_;
244		497	#
245	delete $self->{_tw};	498	# delete @$self{qw(_tw _rw _ww fh wbuf on_read _queue)};
246	delete $self->{_rw};	499	# $self->{_eof} = 1; # tell starttls et. al to stop trying
247	delete $self->{_ww};	500	#
248	delete $self->{fh};	501	# &_freetls;
249		502	#}
250	$self->stoptls;
251	}
252		503
253	sub _error {	504	sub _error {
254	my ($self, $errno, $fatal) = @_;	505	my ($self, $errno, $fatal, $message) = @_;
255
256	$self->_shutdown
257	if $fatal;
258		506
259	$! = $errno;	507	$! = $errno;
		508	$message ||= "$!";
260		509
261	if ($self->{on_error}) {	510	if ($self->{on_error}) {
262	$self->{on_error}($self, $fatal);	511	$self->{on_error}($self, $fatal, $message);
263	} else {	512	$self->destroy if $fatal;
		513	} elsif ($self->{fh}) {
		514	$self->destroy;
264	Carp::croak "AnyEvent::Handle uncaught error: $!";	515	Carp::croak "AnyEvent::Handle uncaught error: $message";
265	}	516	}
266	}	517	}
267		518
268	=item $fh = $handle->fh	519	=item $fh = $handle->fh
269		520
270	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.
271		522
272	=cut	523	=cut
273		524
274	sub fh { $_[0]{fh} }	525	sub fh { $_[0]{fh} }
275		526
…		…
293	$_[0]{on_eof} = $_[1];	544	$_[0]{on_eof} = $_[1];
294	}	545	}
295		546
296	=item $handle->on_timeout ($cb)	547	=item $handle->on_timeout ($cb)
297		548
298	Replace the current C<on_timeout> callback, or disables the callback	549	Replace the current C<on_timeout> callback, or disables the callback (but
299	(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
300	argument.	551	argument and method.
301		552
302	=cut	553	=cut
303		554
304	sub on_timeout {	555	sub on_timeout {
305	$_[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];
306	}	605	}
307		606
308	#############################################################################	607	#############################################################################
309		608
310	=item $handle->timeout ($seconds)	609	=item $handle->timeout ($seconds)
…		…
323	# reset the timeout watcher, as neccessary	622	# reset the timeout watcher, as neccessary
324	# also check for time-outs	623	# also check for time-outs
325	sub _timeout {	624	sub _timeout {
326	my ($self) = @_;	625	my ($self) = @_;
327		626
328	if ($self->{timeout}) {	627	if ($self->{timeout} && $self->{fh}) {
329	my $NOW = AnyEvent->now;	628	my $NOW = AnyEvent->now;
330		629
331	# when would the timeout trigger?	630	# when would the timeout trigger?
332	my $after = $self->{_activity} + $self->{timeout} - $NOW;	631	my $after = $self->{_activity} + $self->{timeout} - $NOW;
333		632
…		…
336	$self->{_activity} = $NOW;	635	$self->{_activity} = $NOW;
337		636
338	if ($self->{on_timeout}) {	637	if ($self->{on_timeout}) {
339	$self->{on_timeout}($self);	638	$self->{on_timeout}($self);
340	} else {	639	} else {
341	$self->_error (&Errno::ETIMEDOUT);	640	$self->_error (Errno::ETIMEDOUT);
342	}	641	}
343		642
344	# callback could have changed timeout value, optimise	643	# callback could have changed timeout value, optimise
345	return unless $self->{timeout};	644	return unless $self->{timeout};
346		645
…		…
388	my ($self, $cb) = @_;	687	my ($self, $cb) = @_;
389		688
390	$self->{on_drain} = $cb;	689	$self->{on_drain} = $cb;
391		690
392	$cb->($self)	691	$cb->($self)
393	if $cb && $self->{low_water_mark} >= length $self->{wbuf};	692	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});
394	}	693	}
395		694
396	=item $handle->push_write ($data)	695	=item $handle->push_write ($data)
397		696
398	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
…		…
409	Scalar::Util::weaken $self;	708	Scalar::Util::weaken $self;
410		709
411	my $cb = sub {	710	my $cb = sub {
412	my $len = syswrite $self->{fh}, $self->{wbuf};	711	my $len = syswrite $self->{fh}, $self->{wbuf};
413		712
414	if ($len >= 0) {	713	if (defined $len) {
415	substr $self->{wbuf}, 0, $len, "";	714	substr $self->{wbuf}, 0, $len, "";
416		715
417	$self->{_activity} = AnyEvent->now;	716	$self->{_activity} = AnyEvent->now;
418		717
419	$self->{on_drain}($self)	718	$self->{on_drain}($self)
420	if $self->{low_water_mark} >= length $self->{wbuf}	719	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
421	&& $self->{on_drain};	720	&& $self->{on_drain};
422		721
423	delete $self->{_ww} unless length $self->{wbuf};	722	delete $self->{_ww} unless length $self->{wbuf};
424	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	723	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
425	$self->_error ($!, 1);	724	$self->_error ($!, 1);
426	}	725	}
427	};	726	};
428		727
429	# try to write data immediately	728	# try to write data immediately
430	$cb->();	729	$cb->() unless $self->{autocork};
431		730
432	# if still data left in wbuf, we need to poll	731	# if still data left in wbuf, we need to poll
433	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)	732	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)
434	if length $self->{wbuf};	733	if length $self->{wbuf};
435	};	734	};
…		…
449		748
450	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")	749	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")
451	->($self, @_);	750	->($self, @_);
452	}	751	}
453		752
454	if ($self->{filter_w}) {	753	if ($self->{tls}) {
455	$self->{filter_w}($self, \$_[0]);	754	$self->{_tls_wbuf} .= $_[0];
		755	&_dotls ($self) if $self->{fh};
456	} else {	756	} else {
457	$self->{wbuf} .= $_[0];	757	$self->{wbuf} .= $_[0];
458	$self->_drain_wbuf;	758	$self->_drain_wbuf if $self->{fh};
459	}	759	}
460	}	760	}
461		761
462	=item $handle->push_write (type => @args)	762	=item $handle->push_write (type => @args)
463		763
…		…
477	=cut	777	=cut
478		778
479	register_write_type netstring => sub {	779	register_write_type netstring => sub {
480	my ($self, $string) = @_;	780	my ($self, $string) = @_;
481		781
482	sprintf "%d:%s,", (length $string), $string	782	(length $string) . ":$string,"
		783	};
		784
		785	=item packstring => $format, $data
		786
		787	An octet string prefixed with an encoded length. The encoding C<$format>
		788	uses the same format as a Perl C<pack> format, but must specify a single
		789	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
		790	optional C<!>, C<< < >> or C<< > >> modifier).
		791
		792	=cut
		793
		794	register_write_type packstring => sub {
		795	my ($self, $format, $string) = @_;
		796
		797	pack "$format/a*", $string
483	};	798	};
484		799
485	=item json => $array_or_hashref	800	=item json => $array_or_hashref
486		801
487	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
…		…
521		836
522	$self->{json} ? $self->{json}->encode ($ref)	837	$self->{json} ? $self->{json}->encode ($ref)
523	: JSON::encode_json ($ref)	838	: JSON::encode_json ($ref)
524	};	839	};
525		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
526	=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	}
527		882
528	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)	883	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)
529		884
530	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>.
531	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
…		…
552	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
553	a queue.	908	a queue.
554		909
555	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
556	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
557	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
558	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).
559		915
560	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
561	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
562	data arrives and removes it when it has done its job (see C<push_read>,	918	data arrives (also the first time it is queued) and removes it when it has
563	below).	919	done its job (see C<push_read>, below).
564		920
565	This way you can, for example, push three line-reads, followed by reading	921	This way you can, for example, push three line-reads, followed by reading
566	a chunk of data, and AnyEvent::Handle will execute them in order.	922	a chunk of data, and AnyEvent::Handle will execute them in order.
567		923
568	Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by	924	Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by
…		…
581	# handle xml	937	# handle xml
582	});	938	});
583	});	939	});
584	});	940	});
585		941
586	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"
587	"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
588	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
589	pipeline sending both requests and manipulate the queue as necessary in	945	just pipeline sending both requests and manipulate the queue as necessary
590	the callbacks:	946	in the callbacks.
591		947
592	# 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"
593	$handle->push_write ("request 1\015\012");	953	$handle->push_write ("request 1\015\012");
594		954
595	# 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
596	$handle->push_read (line => sub {	956	$handle->push_read (line => sub {
597	# if we got an "OK", we have to _prepend_ another line,	957	# if we got an "OK", we have to _prepend_ another line,
…		…
604	...	964	...
605	});	965	});
606	}	966	}
607	});	967	});
608		968
609	# request two	969	# request two, simply returns 64 octets
610	$handle->push_write ("request 2\015\012");	970	$handle->push_write ("request 2\015\012");
611		971
612	# simply read 64 bytes, always	972	# simply read 64 bytes, always
613	$handle->push_read (chunk => 64, sub {	973	$handle->push_read (chunk => 64, sub {
614	my $response = $_[1];	974	my $response = $_[1];
…		…
620	=cut	980	=cut
621		981
622	sub _drain_rbuf {	982	sub _drain_rbuf {
623	my ($self) = @_;	983	my ($self) = @_;
624		984
		985	# avoid recursion
		986	return if exists $self->{_skip_drain_rbuf};
		987	local $self->{_skip_drain_rbuf} = 1;
		988
625	if (	989	if (
626	defined $self->{rbuf_max}	990	defined $self->{rbuf_max}
627	&& $self->{rbuf_max} < length $self->{rbuf}	991	&& $self->{rbuf_max} < length $self->{rbuf}
628	) {	992	) {
629	return $self->_error (&Errno::ENOSPC, 1);	993	$self->_error (Errno::ENOSPC, 1), return;
630	}	994	}
631		995
632	return if $self->{in_drain};	996	while () {
633	local $self->{in_drain} = 1;	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} if exists $self->{_tls_rbuf};
634		1000
635	while (my $len = length $self->{rbuf}) {	1001	my $len = length $self->{rbuf};
636	no strict 'refs';	1002
637	if (my $cb = shift @{ $self->{_queue} }) {	1003	if (my $cb = shift @{ $self->{_queue} }) {
638	unless ($cb->($self)) {	1004	unless ($cb->($self)) {
639	if ($self->{_eof}) {	1005	if ($self->{_eof}) {
640	# no progress can be made (not enough data and no data forthcoming)	1006	# no progress can be made (not enough data and no data forthcoming)
641	return $self->_error (&Errno::EPIPE, 1);	1007	$self->_error (Errno::EPIPE, 1), return;
642	}	1008	}
643		1009
644	unshift @{ $self->{_queue} }, $cb;	1010	unshift @{ $self->{_queue} }, $cb;
645	last;	1011	last;
646	}	1012	}
647	} elsif ($self->{on_read}) {	1013	} elsif ($self->{on_read}) {
		1014	last unless $len;
		1015
648	$self->{on_read}($self);	1016	$self->{on_read}($self);
649		1017
650	if (	1018	if (
651	$len == length $self->{rbuf} # if no data has been consumed	1019	$len == length $self->{rbuf} # if no data has been consumed
652	&& !@{ $self->{_queue} } # and the queue is still empty	1020	&& !@{ $self->{_queue} } # and the queue is still empty
653	&& $self->{on_read} # but we still have on_read	1021	&& $self->{on_read} # but we still have on_read
654	) {	1022	) {
655	# no further data will arrive	1023	# no further data will arrive
656	# so no progress can be made	1024	# so no progress can be made
657	return $self->_error (&Errno::EPIPE, 1)	1025	$self->_error (Errno::EPIPE, 1), return
658	if $self->{_eof};	1026	if $self->{_eof};
659		1027
660	last; # more data might arrive	1028	last; # more data might arrive
661	}	1029	}
662	} else {	1030	} else {
663	# read side becomes idle	1031	# read side becomes idle
664	delete $self->{_rw};	1032	delete $self->{_rw} unless $self->{tls};
665	last;	1033	last;
666	}	1034	}
667	}	1035	}
668		1036
		1037	if ($self->{_eof}) {
		1038	if ($self->{on_eof}) {
669	$self->{on_eof}($self)	1039	$self->{on_eof}($self)
670	if $self->{_eof} && $self->{on_eof};	1040	} else {
		1041	$self->_error (0, 1, "Unexpected end-of-file");
		1042	}
		1043	}
671		1044
672	# may need to restart read watcher	1045	# may need to restart read watcher
673	unless ($self->{_rw}) {	1046	unless ($self->{_rw}) {
674	$self->start_read	1047	$self->start_read
675	if $self->{on_read} || @{ $self->{_queue} };	1048	if $self->{on_read} || @{ $self->{_queue} };
…		…
686		1059
687	sub on_read {	1060	sub on_read {
688	my ($self, $cb) = @_;	1061	my ($self, $cb) = @_;
689		1062
690	$self->{on_read} = $cb;	1063	$self->{on_read} = $cb;
		1064	$self->_drain_rbuf if $cb;
691	}	1065	}
692		1066
693	=item $handle->rbuf	1067	=item $handle->rbuf
694		1068
695	Returns the read buffer (as a modifiable lvalue).	1069	Returns the read buffer (as a modifiable lvalue).
696		1070
697	You can access the read buffer directly as the C<< ->{rbuf} >> member, if	1071	You can access the read buffer directly as the C<< ->{rbuf} >>
698	you want.	1072	member, if you want. However, the only operation allowed on the
		1073	read buffer (apart from looking at it) is removing data from its
		1074	beginning. Otherwise modifying or appending to it is not allowed and will
		1075	lead to hard-to-track-down bugs.
699		1076
700	NOTE: The read buffer should only be used or modified if the C<on_read>,	1077	NOTE: The read buffer should only be used or modified if the C<on_read>,
701	C<push_read> or C<unshift_read> methods are used. The other read methods	1078	C<push_read> or C<unshift_read> methods are used. The other read methods
702	automatically manage the read buffer.	1079	automatically manage the read buffer.
703		1080
…		…
800	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");	1177	$cb->($_[0], substr $_[0]{rbuf}, 0, $len, "");
801	1	1178	1
802	}	1179	}
803	};	1180	};
804		1181
805	# compatibility with older API
806	sub push_read_chunk {
807	$_[0]->push_read (chunk => $_[1], $_[2]);
808	}
809
810	sub unshift_read_chunk {
811	$_[0]->unshift_read (chunk => $_[1], $_[2]);
812	}
813
814	=item line => [$eol, ]$cb->($handle, $line, $eol)	1182	=item line => [$eol, ]$cb->($handle, $line, $eol)
815		1183
816	The callback will be called only once a full line (including the end of	1184	The callback will be called only once a full line (including the end of
817	line marker, C<$eol>) has been read. This line (excluding the end of line	1185	line marker, C<$eol>) has been read. This line (excluding the end of line
818	marker) will be passed to the callback as second argument (C<$line>), and	1186	marker) will be passed to the callback as second argument (C<$line>), and
…		…
833	=cut	1201	=cut
834		1202
835	register_read_type line => sub {	1203	register_read_type line => sub {
836	my ($self, $cb, $eol) = @_;	1204	my ($self, $cb, $eol) = @_;
837		1205
838	$eol = qr|(\015?\012)| if @_ < 3;	1206	if (@_ < 3) {
839	$eol = quotemeta $eol unless ref $eol;	1207	# this is more than twice as fast as the generic code below
840	$eol = qr|^(.*?)($eol)|s;
841
842	sub {	1208	sub {
843	$_[0]{rbuf} =~ s/$eol// or return;	1209	$_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return;
844		1210
845	$cb->($_[0], $1, $2);	1211	$cb->($_[0], $1, $2);
846	1
847	}
848	};
849
850	# compatibility with older API
851	sub push_read_line {
852	my $self = shift;
853	$self->push_read (line => @_);
854	}
855
856	sub unshift_read_line {
857	my $self = shift;
858	$self->unshift_read (line => @_);
859	}
860
861	=item netstring => $cb->($handle, $string)
862
863	A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement).
864
865	Throws an error with C<$!> set to EBADMSG on format violations.
866
867	=cut
868
869	register_read_type netstring => sub {
870	my ($self, $cb) = @_;
871
872	sub {
873	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {
874	if ($_[0]{rbuf} =~ /[^0-9]/) {
875	$self->_error (&Errno::EBADMSG);
876	}	1212	1
877	return;
878	}	1213	}
		1214	} else {
		1215	$eol = quotemeta $eol unless ref $eol;
		1216	$eol = qr|^(.*?)($eol)|s;
879		1217
880	my $len = $1;	1218	sub {
		1219	$_[0]{rbuf} =~ s/$eol// or return;
881		1220
882	$self->unshift_read (chunk => $len, sub {	1221	$cb->($_[0], $1, $2);
883	my $string = $_[1];
884	$_[0]->unshift_read (chunk => 1, sub {
885	if ($_[1] eq ",") {
886	$cb->($_[0], $string);
887	} else {
888	$self->_error (&Errno::EBADMSG);
889	}
890	});	1222	1
891	});	1223	}
892
893	1
894	}	1224	}
895	};	1225	};
896		1226
897	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)	1227	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)
898		1228
…		…
950	return 1;	1280	return 1;
951	}	1281	}
952		1282
953	# reject	1283	# reject
954	if ($reject && $$rbuf =~ $reject) {	1284	if ($reject && $$rbuf =~ $reject) {
955	$self->_error (&Errno::EBADMSG);	1285	$self->_error (Errno::EBADMSG);
956	}	1286	}
957		1287
958	# skip	1288	# skip
959	if ($skip && $$rbuf =~ $skip) {	1289	if ($skip && $$rbuf =~ $skip) {
960	$data .= substr $$rbuf, 0, $+[0], "";	1290	$data .= substr $$rbuf, 0, $+[0], "";
…		…
962		1292
963	()	1293	()
964	}	1294	}
965	};	1295	};
966		1296
		1297	=item netstring => $cb->($handle, $string)
		1298
		1299	A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement).
		1300
		1301	Throws an error with C<$!> set to EBADMSG on format violations.
		1302
		1303	=cut
		1304
		1305	register_read_type netstring => sub {
		1306	my ($self, $cb) = @_;
		1307
		1308	sub {
		1309	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {
		1310	if ($_[0]{rbuf} =~ /[^0-9]/) {
		1311	$self->_error (Errno::EBADMSG);
		1312	}
		1313	return;
		1314	}
		1315
		1316	my $len = $1;
		1317
		1318	$self->unshift_read (chunk => $len, sub {
		1319	my $string = $_[1];
		1320	$_[0]->unshift_read (chunk => 1, sub {
		1321	if ($_[1] eq ",") {
		1322	$cb->($_[0], $string);
		1323	} else {
		1324	$self->_error (Errno::EBADMSG);
		1325	}
		1326	});
		1327	});
		1328
		1329	1
		1330	}
		1331	};
		1332
		1333	=item packstring => $format, $cb->($handle, $string)
		1334
		1335	An octet string prefixed with an encoded length. The encoding C<$format>
		1336	uses the same format as a Perl C<pack> format, but must specify a single
		1337	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
		1338	optional C<!>, C<< < >> or C<< > >> modifier).
		1339
		1340	For example, DNS over TCP uses a prefix of C<n> (2 octet network order),
		1341	EPP uses a prefix of C<N> (4 octtes).
		1342
		1343	Example: read a block of data prefixed by its length in BER-encoded
		1344	format (very efficient).
		1345
		1346	$handle->push_read (packstring => "w", sub {
		1347	my ($handle, $data) = @_;
		1348	});
		1349
		1350	=cut
		1351
		1352	register_read_type packstring => sub {
		1353	my ($self, $cb, $format) = @_;
		1354
		1355	sub {
		1356	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method
		1357	defined (my $len = eval { unpack $format, $_[0]{rbuf} })
		1358	or return;
		1359
		1360	$format = length pack $format, $len;
		1361
		1362	# bypass unshift if we already have the remaining chunk
		1363	if ($format + $len <= length $_[0]{rbuf}) {
		1364	my $data = substr $_[0]{rbuf}, $format, $len;
		1365	substr $_[0]{rbuf}, 0, $format + $len, "";
		1366	$cb->($_[0], $data);
		1367	} else {
		1368	# remove prefix
		1369	substr $_[0]{rbuf}, 0, $format, "";
		1370
		1371	# read remaining chunk
		1372	$_[0]->unshift_read (chunk => $len, $cb);
		1373	}
		1374
		1375	1
		1376	}
		1377	};
		1378
967	=item json => $cb->($handle, $hash_or_arrayref)	1379	=item json => $cb->($handle, $hash_or_arrayref)
968		1380
969	Reads a JSON object or array, decodes it and passes it to the callback.	1381	Reads a JSON object or array, decodes it and passes it to the
		1382	callback. When a parse error occurs, an C<EBADMSG> error will be raised.
970		1383
971	If a C<json> object was passed to the constructor, then that will be used	1384	If a C<json> object was passed to the constructor, then that will be used
972	for the final decode, otherwise it will create a JSON coder expecting UTF-8.	1385	for the final decode, otherwise it will create a JSON coder expecting UTF-8.
973		1386
974	This read type uses the incremental parser available with JSON version	1387	This read type uses the incremental parser available with JSON version
…		…
981	the C<json> write type description, above, for an actual example.	1394	the C<json> write type description, above, for an actual example.
982		1395
983	=cut	1396	=cut
984		1397
985	register_read_type json => sub {	1398	register_read_type json => sub {
986	my ($self, $cb, $accept, $reject, $skip) = @_;	1399	my ($self, $cb) = @_;
987		1400
988	require JSON;	1401	my $json = $self->{json} ||=
		1402	eval { require JSON::XS; JSON::XS->new->utf8 }
		1403	|| do { require JSON; JSON->new->utf8 };
989		1404
990	my $data;	1405	my $data;
991	my $rbuf = \$self->{rbuf};	1406	my $rbuf = \$self->{rbuf};
992		1407
993	my $json = $self->{json} ||= JSON->new->utf8;
994
995	sub {	1408	sub {
996	my $ref = $json->incr_parse ($self->{rbuf});	1409	my $ref = eval { $json->incr_parse ($self->{rbuf}) };
997		1410
998	if ($ref) {	1411	if ($ref) {
999	$self->{rbuf} = $json->incr_text;	1412	$self->{rbuf} = $json->incr_text;
1000	$json->incr_text = "";	1413	$json->incr_text = "";
1001	$cb->($self, $ref);	1414	$cb->($self, $ref);
1002		1415
1003	1	1416	1
		1417	} elsif ($@) {
		1418	# error case
		1419	$json->incr_skip;
		1420
		1421	$self->{rbuf} = $json->incr_text;
		1422	$json->incr_text = "";
		1423
		1424	$self->_error (Errno::EBADMSG);
		1425
		1426	()
1004	} else {	1427	} else {
1005	$self->{rbuf} = "";	1428	$self->{rbuf} = "";
		1429
1006	()	1430	()
1007	}	1431	}
		1432	}
		1433	};
		1434
		1435	=item storable => $cb->($handle, $ref)
		1436
		1437	Deserialises a L<Storable> frozen representation as written by the
		1438	C<storable> write type (BER-encoded length prefix followed by nfreeze'd
		1439	data).
		1440
		1441	Raises C<EBADMSG> error if the data could not be decoded.
		1442
		1443	=cut
		1444
		1445	register_read_type storable => sub {
		1446	my ($self, $cb) = @_;
		1447
		1448	require Storable;
		1449
		1450	sub {
		1451	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method
		1452	defined (my $len = eval { unpack "w", $_[0]{rbuf} })
		1453	or return;
		1454
		1455	my $format = length pack "w", $len;
		1456
		1457	# bypass unshift if we already have the remaining chunk
		1458	if ($format + $len <= length $_[0]{rbuf}) {
		1459	my $data = substr $_[0]{rbuf}, $format, $len;
		1460	substr $_[0]{rbuf}, 0, $format + $len, "";
		1461	$cb->($_[0], Storable::thaw ($data));
		1462	} else {
		1463	# remove prefix
		1464	substr $_[0]{rbuf}, 0, $format, "";
		1465
		1466	# read remaining chunk
		1467	$_[0]->unshift_read (chunk => $len, sub {
		1468	if (my $ref = eval { Storable::thaw ($_[1]) }) {
		1469	$cb->($_[0], $ref);
		1470	} else {
		1471	$self->_error (Errno::EBADMSG);
		1472	}
		1473	});
		1474	}
		1475
		1476	1
1008	}	1477	}
1009	};	1478	};
1010		1479
1011	=back	1480	=back
1012		1481
…		…
1033	=item $handle->stop_read	1502	=item $handle->stop_read
1034		1503
1035	=item $handle->start_read	1504	=item $handle->start_read
1036		1505
1037	In rare cases you actually do not want to read anything from the	1506	In rare cases you actually do not want to read anything from the
1038	socket. In this case you can call C<stop_read>. Neither C<on_read> no	1507	socket. In this case you can call C<stop_read>. Neither C<on_read> nor
1039	any queued callbacks will be executed then. To start reading again, call	1508	any queued callbacks will be executed then. To start reading again, call
1040	C<start_read>.	1509	C<start_read>.
1041		1510
1042	Note that AnyEvent::Handle will automatically C<start_read> for you when	1511	Note that AnyEvent::Handle will automatically C<start_read> for you when
1043	you change the C<on_read> callback or push/unshift a read callback, and it	1512	you change the C<on_read> callback or push/unshift a read callback, and it
1044	will automatically C<stop_read> for you when neither C<on_read> is set nor	1513	will automatically C<stop_read> for you when neither C<on_read> is set nor
1045	there are any read requests in the queue.	1514	there are any read requests in the queue.
1046		1515
		1516	These methods will have no effect when in TLS mode (as TLS doesn't support
		1517	half-duplex connections).
		1518
1047	=cut	1519	=cut
1048		1520
1049	sub stop_read {	1521	sub stop_read {
1050	my ($self) = @_;	1522	my ($self) = @_;
1051		1523
1052	delete $self->{_rw};	1524	delete $self->{_rw} unless $self->{tls};
1053	}	1525	}
1054		1526
1055	sub start_read {	1527	sub start_read {
1056	my ($self) = @_;	1528	my ($self) = @_;
1057		1529
1058	unless ($self->{_rw} || $self->{_eof}) {	1530	unless ($self->{_rw} || $self->{_eof}) {
1059	Scalar::Util::weaken $self;	1531	Scalar::Util::weaken $self;
1060		1532
1061	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1533	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
1062	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1534	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1063	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;	1535	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;
1064		1536
1065	if ($len > 0) {	1537	if ($len > 0) {
1066	$self->{_activity} = AnyEvent->now;	1538	$self->{_activity} = AnyEvent->now;
1067		1539
1068	$self->{filter_r}	1540	if ($self->{tls}) {
1069	? $self->{filter_r}($self, $rbuf)	1541	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
		1542
		1543	&_dotls ($self);
		1544	} else {
1070	: $self->_drain_rbuf;	1545	$self->_drain_rbuf;
		1546	}
1071		1547
1072	} elsif (defined $len) {	1548	} elsif (defined $len) {
1073	delete $self->{_rw};	1549	delete $self->{_rw};
1074	$self->{_eof} = 1;	1550	$self->{_eof} = 1;
1075	$self->_drain_rbuf;	1551	$self->_drain_rbuf;
…		…
1079	}	1555	}
1080	});	1556	});
1081	}	1557	}
1082	}	1558	}
1083		1559
		1560	our $ERROR_SYSCALL;
		1561	our $ERROR_WANT_READ;
		1562
		1563	sub _tls_error {
		1564	my ($self, $err) = @_;
		1565
		1566	return $self->_error ($!, 1)
		1567	if $err == Net::SSLeay::ERROR_SYSCALL ();
		1568
		1569	my $err =Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ());
		1570
		1571	# reduce error string to look less scary
		1572	$err =~ s/^error:[0-9a-fA-F]{8}:[^:]+:([^:]+):/\L$1: /;
		1573
		1574	if ($self->{_on_starttls}) {
		1575	(delete $self->{_on_starttls})->($self, undef, $err);
		1576	&_freetls;
		1577	} else {
		1578	&_freetls;
		1579	$self->_error (Errno::EPROTO, 1, $err);
		1580	}
		1581	}
		1582
		1583	# poll the write BIO and send the data if applicable
		1584	# also decode read data if possible
		1585	# this is basiclaly our TLS state machine
		1586	# more efficient implementations are possible with openssl,
		1587	# but not with the buggy and incomplete Net::SSLeay.
1084	sub _dotls {	1588	sub _dotls {
1085	my ($self) = @_;	1589	my ($self) = @_;
1086		1590
1087	my $buf;	1591	my $tmp;
1088		1592
1089	if (length $self->{_tls_wbuf}) {	1593	if (length $self->{_tls_wbuf}) {
1090	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1594	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1091	substr $self->{_tls_wbuf}, 0, $len, "";	1595	substr $self->{_tls_wbuf}, 0, $tmp, "";
1092	}	1596	}
1093	}
1094		1597
		1598	$tmp = Net::SSLeay::get_error ($self->{tls}, $tmp);
		1599	return $self->_tls_error ($tmp)
		1600	if $tmp != $ERROR_WANT_READ
		1601	&& ($tmp != $ERROR_SYSCALL || $!);
		1602	}
		1603
		1604	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
		1605	unless (length $tmp) {
		1606	$self->{_on_starttls}
		1607	and (delete $self->{_on_starttls})->($self, undef, "EOF during handshake"); # ???
		1608	&_freetls;
		1609
		1610	if ($self->{on_stoptls}) {
		1611	$self->{on_stoptls}($self);
		1612	return;
		1613	} else {
		1614	# let's treat SSL-eof as we treat normal EOF
		1615	delete $self->{_rw};
		1616	$self->{_eof} = 1;
		1617	}
		1618	}
		1619
		1620	$self->{_tls_rbuf} .= $tmp;
		1621	$self->_drain_rbuf;
		1622	$self->{tls} or return; # tls session might have gone away in callback
		1623	}
		1624
		1625	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
		1626	return $self->_tls_error ($tmp)
		1627	if $tmp != $ERROR_WANT_READ
		1628	&& ($tmp != $ERROR_SYSCALL || $!);
		1629
1095	if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {	1630	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1096	$self->{wbuf} .= $buf;	1631	$self->{wbuf} .= $tmp;
1097	$self->_drain_wbuf;	1632	$self->_drain_wbuf;
1098	}	1633	}
1099		1634
1100	while (defined ($buf = Net::SSLeay::read ($self->{tls}))) {	1635	$self->{_on_starttls}
1101	if (length $buf) {	1636	and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK ()
1102	$self->{rbuf} .= $buf;	1637	and (delete $self->{_on_starttls})->($self, 1, "TLS/SSL connection established");
1103	$self->_drain_rbuf;
1104	} else {
1105	# let's treat SSL-eof as we treat normal EOF
1106	$self->{_eof} = 1;
1107	$self->_shutdown;
1108	return;
1109	}
1110	}
1111
1112	my $err = Net::SSLeay::get_error ($self->{tls}, -1);
1113
1114	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {
1115	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {
1116	return $self->_error ($!, 1);
1117	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {
1118	return $self->_error (&Errno::EIO, 1);
1119	}
1120
1121	# all others are fine for our purposes
1122	}
1123	}	1638	}
1124		1639
1125	=item $handle->starttls ($tls[, $tls_ctx])	1640	=item $handle->starttls ($tls[, $tls_ctx])
1126		1641
1127	Instead of starting TLS negotiation immediately when the AnyEvent::Handle	1642	Instead of starting TLS negotiation immediately when the AnyEvent::Handle
1128	object is created, you can also do that at a later time by calling	1643	object is created, you can also do that at a later time by calling
1129	C<starttls>.	1644	C<starttls>.
1130		1645
		1646	Starting TLS is currently an asynchronous operation - when you push some
		1647	write data and then call C<< ->starttls >> then TLS negotiation will start
		1648	immediately, after which the queued write data is then sent.
		1649
1131	The first argument is the same as the C<tls> constructor argument (either	1650	The first argument is the same as the C<tls> constructor argument (either
1132	C<"connect">, C<"accept"> or an existing Net::SSLeay object).	1651	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
1133		1652
1134	The second argument is the optional C<Net::SSLeay::CTX> object that is	1653	The second argument is the optional C<AnyEvent::TLS> object that is used
1135	used when AnyEvent::Handle has to create its own TLS connection object.	1654	when AnyEvent::Handle has to create its own TLS connection object, or
		1655	a hash reference with C<< key => value >> pairs that will be used to
		1656	construct a new context.
1136		1657
1137	The TLS connection object will end up in C<< $handle->{tls} >> after this	1658	The TLS connection object will end up in C<< $handle->{tls} >>, the TLS
1138	call and can be used or changed to your liking. Note that the handshake	1659	context in C<< $handle->{tls_ctx} >> after this call and can be used or
1139	might have already started when this function returns.	1660	changed to your liking. Note that the handshake might have already started
		1661	when this function returns.
1140		1662
		1663	Due to bugs in OpenSSL, it might or might not be possible to do multiple
		1664	handshakes on the same stream. Best do not attempt to use the stream after
		1665	stopping TLS.
		1666
1141	=cut	1667	=cut
		1668
		1669	our %TLS_CACHE; #TODO not yet documented, should we?
1142		1670
1143	sub starttls {	1671	sub starttls {
1144	my ($self, $ssl, $ctx) = @_;	1672	my ($self, $tls, $ctx) = @_;
1145		1673
1146	$self->stoptls;	1674	Carp::croak "It is an error to call starttls on an AnyEvent::Handle object while TLS is already active, caught"
		1675	if $self->{tls};
1147		1676
1148	if ($ssl eq "accept") {	1677	$self->{tls} = $tls;
1149	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());	1678	$self->{tls_ctx} = $ctx if @_ > 2;
1150	Net::SSLeay::set_accept_state ($ssl);	1679
1151	} elsif ($ssl eq "connect") {	1680	return unless $self->{fh};
1152	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());	1681
1153	Net::SSLeay::set_connect_state ($ssl);	1682	require Net::SSLeay;
		1683
		1684	$ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL ();
		1685	$ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ ();
		1686
		1687	$tls = $self->{tls};
		1688	$ctx = $self->{tls_ctx};
		1689
		1690	local $Carp::CarpLevel = 1; # skip ourselves when creating a new context or session
		1691
		1692	if ("HASH" eq ref $ctx) {
		1693	require AnyEvent::TLS;
		1694
		1695	if ($ctx->{cache}) {
		1696	my $key = $ctx+0;
		1697	$ctx = $TLS_CACHE{$key} ||= new AnyEvent::TLS %$ctx;
		1698	} else {
		1699	$ctx = new AnyEvent::TLS %$ctx;
		1700	}
		1701	}
1154	}	1702
1155		1703	$self->{tls_ctx} = $ctx || TLS_CTX ();
1156	$self->{tls} = $ssl;	1704	$self->{tls} = $tls = $self->{tls_ctx}->_get_session ($tls, $self, $self->{peername});
1157		1705
1158	# basically, this is deep magic (because SSL_read should have the same issues)	1706	# basically, this is deep magic (because SSL_read should have the same issues)
1159	# but the openssl maintainers basically said: "trust us, it just works".	1707	# but the openssl maintainers basically said: "trust us, it just works".
1160	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1708	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1161	# and mismaintained ssleay-module doesn't even offer them).	1709	# and mismaintained ssleay-module doesn't even offer them).
1162	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html	1710	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
		1711	#
		1712	# in short: this is a mess.
		1713	#
		1714	# note that we do not try to keep the length constant between writes as we are required to do.
		1715	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
		1716	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
		1717	# have identity issues in that area.
1163	Net::SSLeay::CTX_set_mode ($self->{tls},	1718	# Net::SSLeay::CTX_set_mode ($ssl,
1164	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)	1719	# (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)
1165	| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));	1720	# | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));
		1721	Net::SSLeay::CTX_set_mode ($tls, 1|2);
1166		1722
1167	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1723	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1168	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1724	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1169		1725
1170	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	1726	Net::SSLeay::set_bio ($tls, $self->{_rbio}, $self->{_wbio});
1171		1727
1172	$self->{filter_w} = sub {	1728	$self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) }
1173	$_[0]{_tls_wbuf} .= ${$_[1]};	1729	if $self->{on_starttls};
1174	&_dotls;	1730
1175	};	1731	&_dotls; # need to trigger the initial handshake
1176	$self->{filter_r} = sub {	1732	$self->start_read; # make sure we actually do read
1177	Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]});
1178	&_dotls;
1179	};
1180	}	1733	}
1181		1734
1182	=item $handle->stoptls	1735	=item $handle->stoptls
1183		1736
1184	Destroys the SSL connection, if any. Partial read or write data will be	1737	Shuts down the SSL connection - this makes a proper EOF handshake by
1185	lost.	1738	sending a close notify to the other side, but since OpenSSL doesn't
		1739	support non-blocking shut downs, it is not guarenteed that you can re-use
		1740	the stream afterwards.
1186		1741
1187	=cut	1742	=cut
1188		1743
1189	sub stoptls {	1744	sub stoptls {
1190	my ($self) = @_;	1745	my ($self) = @_;
1191		1746
1192	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};	1747	if ($self->{tls}) {
		1748	Net::SSLeay::shutdown ($self->{tls});
1193		1749
1194	delete $self->{_rbio};	1750	&_dotls;
1195	delete $self->{_wbio};	1751
1196	delete $self->{_tls_wbuf};	1752	# # we don't give a shit. no, we do, but we can't. no...#d#
1197	delete $self->{filter_r};	1753	# # we, we... have to use openssl :/#d#
1198	delete $self->{filter_w};	1754	# &_freetls;#d#
		1755	}
		1756	}
		1757
		1758	sub _freetls {
		1759	my ($self) = @_;
		1760
		1761	return unless $self->{tls};
		1762
		1763	$self->{tls_ctx}->_put_session (delete $self->{tls})
		1764	if ref $self->{tls};
		1765
		1766	delete @$self{qw(_rbio _wbio _tls_wbuf _on_starttls)};
1199	}	1767	}
1200		1768
1201	sub DESTROY {	1769	sub DESTROY {
1202	my $self = shift;	1770	my ($self) = @_;
1203		1771
1204	$self->stoptls;	1772	&_freetls;
		1773
		1774	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
		1775
		1776	if ($linger && length $self->{wbuf} && $self->{fh}) {
		1777	my $fh = delete $self->{fh};
		1778	my $wbuf = delete $self->{wbuf};
		1779
		1780	my @linger;
		1781
		1782	push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub {
		1783	my $len = syswrite $fh, $wbuf, length $wbuf;
		1784
		1785	if ($len > 0) {
		1786	substr $wbuf, 0, $len, "";
		1787	} else {
		1788	@linger = (); # end
		1789	}
		1790	});
		1791	push @linger, AnyEvent->timer (after => $linger, cb => sub {
		1792	@linger = ();
		1793	});
		1794	}
		1795	}
		1796
		1797	=item $handle->destroy
		1798
		1799	Shuts down the handle object as much as possible - this call ensures that
		1800	no further callbacks will be invoked and as many resources as possible
		1801	will be freed. You must not call any methods on the object afterwards.
		1802
		1803	Normally, you can just "forget" any references to an AnyEvent::Handle
		1804	object and it will simply shut down. This works in fatal error and EOF
		1805	callbacks, as well as code outside. It does I<NOT> work in a read or write
		1806	callback, so when you want to destroy the AnyEvent::Handle object from
		1807	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
		1808	that case.
		1809
		1810	Destroying the handle object in this way has the advantage that callbacks
		1811	will be removed as well, so if those are the only reference holders (as
		1812	is common), then one doesn't need to do anything special to break any
		1813	reference cycles.
		1814
		1815	The handle might still linger in the background and write out remaining
		1816	data, as specified by the C<linger> option, however.
		1817
		1818	=cut
		1819
		1820	sub destroy {
		1821	my ($self) = @_;
		1822
		1823	$self->DESTROY;
		1824	%$self = ();
1205	}	1825	}
1206		1826
1207	=item AnyEvent::Handle::TLS_CTX	1827	=item AnyEvent::Handle::TLS_CTX
1208		1828
1209	This function creates and returns the Net::SSLeay::CTX object used by	1829	This function creates and returns the AnyEvent::TLS object used by default
1210	default for TLS mode.	1830	for TLS mode.
1211		1831
1212	The context is created like this:	1832	The context is created by calling L<AnyEvent::TLS> without any arguments.
1213
1214	Net::SSLeay::load_error_strings;
1215	Net::SSLeay::SSLeay_add_ssl_algorithms;
1216	Net::SSLeay::randomize;
1217
1218	my $CTX = Net::SSLeay::CTX_new;
1219
1220	Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL
1221		1833
1222	=cut	1834	=cut
1223		1835
1224	our $TLS_CTX;	1836	our $TLS_CTX;
1225		1837
1226	sub TLS_CTX() {	1838	sub TLS_CTX() {
1227	$TLS_CTX || do {	1839	$TLS_CTX ||= do {
1228	require Net::SSLeay;	1840	require AnyEvent::TLS;
1229		1841
1230	Net::SSLeay::load_error_strings ();	1842	new AnyEvent::TLS
1231	Net::SSLeay::SSLeay_add_ssl_algorithms ();
1232	Net::SSLeay::randomize ();
1233
1234	$TLS_CTX = Net::SSLeay::CTX_new ();
1235
1236	Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ());
1237
1238	$TLS_CTX
1239	}	1843	}
1240	}	1844	}
1241		1845
1242	=back	1846	=back
		1847
		1848
		1849	=head1 NONFREQUENTLY ASKED QUESTIONS
		1850
		1851	=over 4
		1852
		1853	=item I C<undef> the AnyEvent::Handle reference inside my callback and
		1854	still get further invocations!
		1855
		1856	That's because AnyEvent::Handle keeps a reference to itself when handling
		1857	read or write callbacks.
		1858
		1859	It is only safe to "forget" the reference inside EOF or error callbacks,
		1860	from within all other callbacks, you need to explicitly call the C<<
		1861	->destroy >> method.
		1862
		1863	=item I get different callback invocations in TLS mode/Why can't I pause
		1864	reading?
		1865
		1866	Unlike, say, TCP, TLS connections do not consist of two independent
		1867	communication channels, one for each direction. Or put differently. The
		1868	read and write directions are not independent of each other: you cannot
		1869	write data unless you are also prepared to read, and vice versa.
		1870
		1871	This can mean than, in TLS mode, you might get C<on_error> or C<on_eof>
		1872	callback invocations when you are not expecting any read data - the reason
		1873	is that AnyEvent::Handle always reads in TLS mode.
		1874
		1875	During the connection, you have to make sure that you always have a
		1876	non-empty read-queue, or an C<on_read> watcher. At the end of the
		1877	connection (or when you no longer want to use it) you can call the
		1878	C<destroy> method.
		1879
		1880	=item How do I read data until the other side closes the connection?
		1881
		1882	If you just want to read your data into a perl scalar, the easiest way
		1883	to achieve this is by setting an C<on_read> callback that does nothing,
		1884	clearing the C<on_eof> callback and in the C<on_error> callback, the data
		1885	will be in C<$_[0]{rbuf}>:
		1886
		1887	$handle->on_read (sub { });
		1888	$handle->on_eof (undef);
		1889	$handle->on_error (sub {
		1890	my $data = delete $_[0]{rbuf};
		1891	});
		1892
		1893	The reason to use C<on_error> is that TCP connections, due to latencies
		1894	and packets loss, might get closed quite violently with an error, when in
		1895	fact, all data has been received.
		1896
		1897	It is usually better to use acknowledgements when transferring data,
		1898	to make sure the other side hasn't just died and you got the data
		1899	intact. This is also one reason why so many internet protocols have an
		1900	explicit QUIT command.
		1901
		1902	=item I don't want to destroy the handle too early - how do I wait until
		1903	all data has been written?
		1904
		1905	After writing your last bits of data, set the C<on_drain> callback
		1906	and destroy the handle in there - with the default setting of
		1907	C<low_water_mark> this will be called precisely when all data has been
		1908	written to the socket:
		1909
		1910	$handle->push_write (...);
		1911	$handle->on_drain (sub {
		1912	warn "all data submitted to the kernel\n";
		1913	undef $handle;
		1914	});
		1915
		1916	If you just want to queue some data and then signal EOF to the other side,
		1917	consider using C<< ->push_shutdown >> instead.
		1918
		1919	=item I want to contact a TLS/SSL server, I don't care about security.
		1920
		1921	If your TLS server is a pure TLS server (e.g. HTTPS) that only speaks TLS,
		1922	simply connect to it and then create the AnyEvent::Handle with the C<tls>
		1923	parameter:
		1924
		1925	tcp_connect $host, $port, sub {
		1926	my ($fh) = @_;
		1927
		1928	my $handle = new AnyEvent::Handle
		1929	fh => $fh,
		1930	tls => "connect",
		1931	on_error => sub { ... };
		1932
		1933	$handle->push_write (...);
		1934	};
		1935
		1936	=item I want to contact a TLS/SSL server, I do care about security.
		1937
		1938	Then you should additionally enable certificate verification, including
		1939	peername verification, if the protocol you use supports it (see
		1940	L<AnyEvent::TLS>, C<verify_peername>).
		1941
		1942	E.g. for HTTPS:
		1943
		1944	tcp_connect $host, $port, sub {
		1945	my ($fh) = @_;
		1946
		1947	my $handle = new AnyEvent::Handle
		1948	fh => $fh,
		1949	peername => $host,
		1950	tls => "connect",
		1951	tls_ctx => { verify => 1, verify_peername => "https" },
		1952	...
		1953
		1954	Note that you must specify the hostname you connected to (or whatever
		1955	"peername" the protocol needs) as the C<peername> argument, otherwise no
		1956	peername verification will be done.
		1957
		1958	The above will use the system-dependent default set of trusted CA
		1959	certificates. If you want to check against a specific CA, add the
		1960	C<ca_file> (or C<ca_cert>) arguments to C<tls_ctx>:
		1961
		1962	tls_ctx => {
		1963	verify => 1,
		1964	verify_peername => "https",
		1965	ca_file => "my-ca-cert.pem",
		1966	},
		1967
		1968	=item I want to create a TLS/SSL server, how do I do that?
		1969
		1970	Well, you first need to get a server certificate and key. You have
		1971	three options: a) ask a CA (buy one, use cacert.org etc.) b) create a
		1972	self-signed certificate (cheap. check the search engine of your choice,
		1973	there are many tutorials on the net) or c) make your own CA (tinyca2 is a
		1974	nice program for that purpose).
		1975
		1976	Then create a file with your private key (in PEM format, see
		1977	L<AnyEvent::TLS>), followed by the certificate (also in PEM format). The
		1978	file should then look like this:
		1979
		1980	-----BEGIN RSA PRIVATE KEY-----
		1981	...header data
		1982	... lots of base64'y-stuff
		1983	-----END RSA PRIVATE KEY-----
		1984
		1985	-----BEGIN CERTIFICATE-----
		1986	... lots of base64'y-stuff
		1987	-----END CERTIFICATE-----
		1988
		1989	The important bits are the "PRIVATE KEY" and "CERTIFICATE" parts. Then
		1990	specify this file as C<cert_file>:
		1991
		1992	tcp_server undef, $port, sub {
		1993	my ($fh) = @_;
		1994
		1995	my $handle = new AnyEvent::Handle
		1996	fh => $fh,
		1997	tls => "accept",
		1998	tls_ctx => { cert_file => "my-server-keycert.pem" },
		1999	...
		2000
		2001	When you have intermediate CA certificates that your clients might not
		2002	know about, just append them to the C<cert_file>.
		2003
		2004	=back
		2005
1243		2006
1244	=head1 SUBCLASSING AnyEvent::Handle	2007	=head1 SUBCLASSING AnyEvent::Handle
1245		2008
1246	In many cases, you might want to subclass AnyEvent::Handle.	2009	In many cases, you might want to subclass AnyEvent::Handle.
1247		2010
…		…
1251	=over 4	2014	=over 4
1252		2015
1253	=item * all constructor arguments become object members.	2016	=item * all constructor arguments become object members.
1254		2017
1255	At least initially, when you pass a C<tls>-argument to the constructor it	2018	At least initially, when you pass a C<tls>-argument to the constructor it
1256	will end up in C<< $handle->{tls} >>. Those members might be changes or	2019	will end up in C<< $handle->{tls} >>. Those members might be changed or
1257	mutated later on (for example C<tls> will hold the TLS connection object).	2020	mutated later on (for example C<tls> will hold the TLS connection object).
1258		2021
1259	=item * other object member names are prefixed with an C<_>.	2022	=item * other object member names are prefixed with an C<_>.
1260		2023
1261	All object members not explicitly documented (internal use) are prefixed	2024	All object members not explicitly documented (internal use) are prefixed

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