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Revision 1.196 by root, Tue Jun 8 10:04:17 2010 UTC

1	package AnyEvent::Handle;
2
3	no warnings;
4	use strict qw(subs vars);
5
6	use AnyEvent ();
7	use AnyEvent::Util qw(WSAEWOULDBLOCK);
8	use Scalar::Util ();
9	use Carp ();
10	use Fcntl ();
11	use Errno qw(EAGAIN EINTR);
12
13	=head1 NAME	1	=head1 NAME
14		2
15	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent	3	AnyEvent::Handle - non-blocking I/O on streaming handles via AnyEvent
16
17	=cut
18
19	our $VERSION = 4.232;
20		4
21	=head1 SYNOPSIS	5	=head1 SYNOPSIS
22		6
23	use AnyEvent;	7	use AnyEvent;
24	use AnyEvent::Handle;	8	use AnyEvent::Handle;
25		9
26	my $cv = AnyEvent->condvar;	10	my $cv = AnyEvent->condvar;
27		11
28	my $handle =	12	my $hdl; $hdl = new AnyEvent::Handle
29	AnyEvent::Handle->new (
30	fh => \*STDIN,	13	fh => \*STDIN,
31	on_eof => sub {	14	on_error => sub {
32	$cv->broadcast;	15	my ($hdl, $fatal, $msg) = @_;
33	},	16	warn "got error $msg\n";
		17	$hdl->destroy;
		18	$cv->send;
34	);	19	};
35		20
36	# send some request line	21	# send some request line
37	$handle->push_write ("getinfo\015\012");	22	$hdl->push_write ("getinfo\015\012");
38		23
39	# read the response line	24	# read the response line
40	$handle->push_read (line => sub {	25	$hdl->push_read (line => sub {
41	my ($handle, $line) = @_;	26	my ($hdl, $line) = @_;
42	warn "read line <$line>\n";	27	warn "got line <$line>\n";
43	$cv->send;	28	$cv->send;
44	});	29	});
45		30
46	$cv->recv;	31	$cv->recv;
47		32
48	=head1 DESCRIPTION	33	=head1 DESCRIPTION
49		34
50	This module is a helper module to make it easier to do event-based I/O on	35	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	36	stream-based filehandles (sockets, pipes or other stream things).
52	on sockets see L<AnyEvent::Util>.	37
		38	The L<AnyEvent::Intro> tutorial contains some well-documented
		39	AnyEvent::Handle examples.
53		40
54	In the following, when the documentation refers to of "bytes" then this	41	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	42	means characters. As sysread and syswrite are used for all I/O, their
56	treatment of characters applies to this module as well.	43	treatment of characters applies to this module as well.
57		44
		45	At the very minimum, you should specify C<fh> or C<connect>, and the
		46	C<on_error> callback.
		47
58	All callbacks will be invoked with the handle object as their first	48	All callbacks will be invoked with the handle object as their first
59	argument.	49	argument.
60		50
		51	=cut
		52
		53	package AnyEvent::Handle;
		54
		55	use Scalar::Util ();
		56	use List::Util ();
		57	use Carp ();
		58	use Errno qw(EAGAIN EINTR);
		59
		60	use AnyEvent (); BEGIN { AnyEvent::common_sense }
		61	use AnyEvent::Util qw(WSAEWOULDBLOCK);
		62
		63	our $VERSION = $AnyEvent::VERSION;
		64
		65	sub _load_func($) {
		66	my $func = $_[0];
		67
		68	unless (defined &$func) {
		69	my $pkg = $func;
		70	do {
		71	$pkg =~ s/::[^:]+$//
		72	or return;
		73	eval "require $pkg";
		74	} until defined &$func;
		75	}
		76
		77	\&$func
		78	}
		79
61	=head1 METHODS	80	=head1 METHODS
62		81
63	=over 4	82	=over 4
64		83
65	=item B<new (%args)>	84	=item $handle = B<new> AnyEvent::Handle fh => $filehandle, key => value...
66		85
67	The constructor supports these arguments (all as key => value pairs).	86	The constructor supports these arguments (all as C<< key => value >> pairs).
68		87
69	=over 4	88	=over 4
70		89
71	=item fh => $filehandle [MANDATORY]	90	=item fh => $filehandle [C<fh> or C<connect> MANDATORY]
72		91
73	The filehandle this L<AnyEvent::Handle> object will operate on.	92	The filehandle this L<AnyEvent::Handle> object will operate on.
74
75	NOTE: The filehandle will be set to non-blocking mode (using	93	NOTE: The filehandle will be set to non-blocking mode (using
76	C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in	94	C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in
77	that mode.	95	that mode.
78		96
		97	=item connect => [$host, $service] [C<fh> or C<connect> MANDATORY]
		98
		99	Try to connect to the specified host and service (port), using
		100	C<AnyEvent::Socket::tcp_connect>. The C<$host> additionally becomes the
		101	default C<peername>.
		102
		103	You have to specify either this parameter, or C<fh>, above.
		104
		105	It is possible to push requests on the read and write queues, and modify
		106	properties of the stream, even while AnyEvent::Handle is connecting.
		107
		108	When this parameter is specified, then the C<on_prepare>,
		109	C<on_connect_error> and C<on_connect> callbacks will be called under the
		110	appropriate circumstances:
		111
		112	=over 4
		113
79	=item on_eof => $cb->($handle)	114	=item on_prepare => $cb->($handle)
80		115
81	Set the callback to be called when an end-of-file condition is detected,	116	This (rarely used) callback is called before a new connection is
82	i.e. in the case of a socket, when the other side has closed the	117	attempted, but after the file handle has been created. It could be used to
83	connection cleanly.	118	prepare the file handle with parameters required for the actual connect
		119	(as opposed to settings that can be changed when the connection is already
		120	established).
84		121
85	For sockets, this just means that the other side has stopped sending data,	122	The return value of this callback should be the connect timeout value in
86	you can still try to write data, and, in fact, one can return from the eof	123	seconds (or C<0>, or C<undef>, or the empty list, to indicate the default
87	callback and continue writing data, as only the read part has been shut	124	timeout is to be used).
88	down.
89		125
90	While not mandatory, it is I<highly> recommended to set an eof callback,	126	=item on_connect => $cb->($handle, $host, $port, $retry->())
91	otherwise you might end up with a closed socket while you are still
92	waiting for data.
93		127
94	If an EOF condition has been detected but no C<on_eof> callback has been	128	This callback is called when a connection has been successfully established.
95	set, then a fatal error will be raised with C<$!> set to <0>.
96		129
		130	The actual numeric host and port (the socket peername) are passed as
		131	parameters, together with a retry callback.
		132
		133	When, for some reason, the handle is not acceptable, then calling
		134	C<$retry> will continue with the next connection target (in case of
		135	multi-homed hosts or SRV records there can be multiple connection
		136	endpoints). At the time it is called the read and write queues, eof
		137	status, tls status and similar properties of the handle will have been
		138	reset.
		139
		140	In most cases, ignoring the C<$retry> parameter is the way to go.
		141
		142	=item on_connect_error => $cb->($handle, $message)
		143
		144	This callback is called when the connection could not be
		145	established. C<$!> will contain the relevant error code, and C<$message> a
		146	message describing it (usually the same as C<"$!">).
		147
		148	If this callback isn't specified, then C<on_error> will be called with a
		149	fatal error instead.
		150
		151	=back
		152
97	=item on_error => $cb->($handle, $fatal)	153	=item on_error => $cb->($handle, $fatal, $message)
98		154
99	This is the error callback, which is called when, well, some error	155	This is the error callback, which is called when, well, some error
100	occured, such as not being able to resolve the hostname, failure to	156	occured, such as not being able to resolve the hostname, failure to
101	connect or a read error.	157	connect or a read error.
102		158
103	Some errors are fatal (which is indicated by C<$fatal> being true). On	159	Some errors are fatal (which is indicated by C<$fatal> being true). On
104	fatal errors the handle object will be shut down and will not be usable	160	fatal errors the handle object will be destroyed (by a call to C<< ->
105	(but you are free to look at the current C< ->rbuf >). Examples of fatal	161	destroy >>) after invoking the error callback (which means you are free to
106	errors are an EOF condition with active (but unsatisifable) read watchers	162	examine the handle object). Examples of fatal errors are an EOF condition
107	(C<EPIPE>) or I/O errors.	163	with active (but unsatisifable) read watchers (C<EPIPE>) or I/O errors. In
		164	cases where the other side can close the connection at their will it is
		165	often easiest to not report C<EPIPE> errors in this callback.
		166
		167	AnyEvent::Handle tries to find an appropriate error code for you to check
		168	against, but in some cases (TLS errors), this does not work well. It is
		169	recommended to always output the C<$message> argument in human-readable
		170	error messages (it's usually the same as C<"$!">).
108		171
109	Non-fatal errors can be retried by simply returning, but it is recommended	172	Non-fatal errors can be retried by simply returning, but it is recommended
110	to simply ignore this parameter and instead abondon the handle object	173	to simply ignore this parameter and instead abondon the handle object
111	when this callback is invoked. Examples of non-fatal errors are timeouts	174	when this callback is invoked. Examples of non-fatal errors are timeouts
112	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).	175	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
113		176
114	On callback entrance, the value of C<$!> contains the operating system	177	On callback entrance, the value of C<$!> contains the operating system
115	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).	178	error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or
		179	C<EPROTO>).
116		180
117	While not mandatory, it is I<highly> recommended to set this callback, as	181	While not mandatory, it is I<highly> recommended to set this callback, as
118	you will not be notified of errors otherwise. The default simply calls	182	you will not be notified of errors otherwise. The default simply calls
119	C<croak>.	183	C<croak>.
120		184
…		…
124	and no read request is in the queue (unlike read queue callbacks, this	188	and no read request is in the queue (unlike read queue callbacks, this
125	callback will only be called when at least one octet of data is in the	189	callback will only be called when at least one octet of data is in the
126	read buffer).	190	read buffer).
127		191
128	To access (and remove data from) the read buffer, use the C<< ->rbuf >>	192	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
129	method or access the C<$handle->{rbuf}> member directly.	193	method or access the C<< $handle->{rbuf} >> member directly. Note that you
		194	must not enlarge or modify the read buffer, you can only remove data at
		195	the beginning from it.
130		196
131	When an EOF condition is detected then AnyEvent::Handle will first try to	197	When an EOF condition is detected then AnyEvent::Handle will first try to
132	feed all the remaining data to the queued callbacks and C<on_read> before	198	feed all the remaining data to the queued callbacks and C<on_read> before
133	calling the C<on_eof> callback. If no progress can be made, then a fatal	199	calling the C<on_eof> callback. If no progress can be made, then a fatal
134	error will be raised (with C<$!> set to C<EPIPE>).	200	error will be raised (with C<$!> set to C<EPIPE>).
		201
		202	Note that, unlike requests in the read queue, an C<on_read> callback
		203	doesn't mean you I<require> some data: if there is an EOF and there
		204	are outstanding read requests then an error will be flagged. With an
		205	C<on_read> callback, the C<on_eof> callback will be invoked.
		206
		207	=item on_eof => $cb->($handle)
		208
		209	Set the callback to be called when an end-of-file condition is detected,
		210	i.e. in the case of a socket, when the other side has closed the
		211	connection cleanly, and there are no outstanding read requests in the
		212	queue (if there are read requests, then an EOF counts as an unexpected
		213	connection close and will be flagged as an error).
		214
		215	For sockets, this just means that the other side has stopped sending data,
		216	you can still try to write data, and, in fact, one can return from the EOF
		217	callback and continue writing data, as only the read part has been shut
		218	down.
		219
		220	If an EOF condition has been detected but no C<on_eof> callback has been
		221	set, then a fatal error will be raised with C<$!> set to <0>.
135		222
136	=item on_drain => $cb->($handle)	223	=item on_drain => $cb->($handle)
137		224
138	This sets the callback that is called when the write buffer becomes empty	225	This sets the callback that is called when the write buffer becomes empty
139	(or when the callback is set and the buffer is empty already).	226	(or when the callback is set and the buffer is empty already).
…		…
146	memory and push it into the queue, but instead only read more data from	233	memory and push it into the queue, but instead only read more data from
147	the file when the write queue becomes empty.	234	the file when the write queue becomes empty.
148		235
149	=item timeout => $fractional_seconds	236	=item timeout => $fractional_seconds
150		237
		238	=item rtimeout => $fractional_seconds
		239
		240	=item wtimeout => $fractional_seconds
		241
151	If non-zero, then this enables an "inactivity" timeout: whenever this many	242	If non-zero, then these enables an "inactivity" timeout: whenever this
152	seconds pass without a successful read or write on the underlying file	243	many seconds pass without a successful read or write on the underlying
153	handle, the C<on_timeout> callback will be invoked (and if that one is	244	file handle (or a call to C<timeout_reset>), the C<on_timeout> callback
154	missing, an C<ETIMEDOUT> error will be raised).	245	will be invoked (and if that one is missing, a non-fatal C<ETIMEDOUT>
		246	error will be raised).
		247
		248	There are three variants of the timeouts that work fully independent
		249	of each other, for both read and write, just read, and just write:
		250	C<timeout>, C<rtimeout> and C<wtimeout>, with corresponding callbacks
		251	C<on_timeout>, C<on_rtimeout> and C<on_wtimeout>, and reset functions
		252	C<timeout_reset>, C<rtimeout_reset>, and C<wtimeout_reset>.
155		253
156	Note that timeout processing is also active when you currently do not have	254	Note that timeout processing is also active when you currently do not have
157	any outstanding read or write requests: If you plan to keep the connection	255	any outstanding read or write requests: If you plan to keep the connection
158	idle then you should disable the timout temporarily or ignore the timeout	256	idle then you should disable the timout temporarily or ignore the timeout
159	in the C<on_timeout> callback.	257	in the C<on_timeout> callback, in which case AnyEvent::Handle will simply
		258	restart the timeout.
160		259
161	Zero (the default) disables this timeout.	260	Zero (the default) disables this timeout.
162		261
163	=item on_timeout => $cb->($handle)	262	=item on_timeout => $cb->($handle)
164		263
…		…
168		267
169	=item rbuf_max => <bytes>	268	=item rbuf_max => <bytes>
170		269
171	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)	270	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)
172	when the read buffer ever (strictly) exceeds this size. This is useful to	271	when the read buffer ever (strictly) exceeds this size. This is useful to
173	avoid denial-of-service attacks.	272	avoid some forms of denial-of-service attacks.
174		273
175	For example, a server accepting connections from untrusted sources should	274	For example, a server accepting connections from untrusted sources should
176	be configured to accept only so-and-so much data that it cannot act on	275	be configured to accept only so-and-so much data that it cannot act on
177	(for example, when expecting a line, an attacker could send an unlimited	276	(for example, when expecting a line, an attacker could send an unlimited
178	amount of data without a callback ever being called as long as the line	277	amount of data without a callback ever being called as long as the line
179	isn't finished).	278	isn't finished).
180		279
181	=item autocork => <boolean>	280	=item autocork => <boolean>
182		281
183	When disabled (the default), then C<push_write> will try to immediately	282	When disabled (the default), then C<push_write> will try to immediately
184	write the data to the handle if possible. This avoids having to register	283	write the data to the handle, if possible. This avoids having to register
185	a write watcher and wait for the next event loop iteration, but can be	284	a write watcher and wait for the next event loop iteration, but can
186	inefficient if you write multiple small chunks (this disadvantage is	285	be inefficient if you write multiple small chunks (on the wire, this
187	usually avoided by your kernel's nagle algorithm, see C<low_delay>).	286	disadvantage is usually avoided by your kernel's nagle algorithm, see
		287	C<no_delay>, but this option can save costly syscalls).
188		288
189	When enabled, then writes will always be queued till the next event loop	289	When enabled, then writes will always be queued till the next event loop
190	iteration. This is efficient when you do many small writes per iteration,	290	iteration. This is efficient when you do many small writes per iteration,
191	but less efficient when you do a single write only.	291	but less efficient when you do a single write only per iteration (or when
		292	the write buffer often is full). It also increases write latency.
192		293
193	=item no_delay => <boolean>	294	=item no_delay => <boolean>
194		295
195	When doing small writes on sockets, your operating system kernel might	296	When doing small writes on sockets, your operating system kernel might
196	wait a bit for more data before actually sending it out. This is called	297	wait a bit for more data before actually sending it out. This is called
197	the Nagle algorithm, and usually it is beneficial.	298	the Nagle algorithm, and usually it is beneficial.
198		299
199	In some situations you want as low a delay as possible, which cna be	300	In some situations you want as low a delay as possible, which can be
200	accomplishd by setting this option to true.	301	accomplishd by setting this option to a true value.
201		302
202	The default is your opertaing system's default behaviour, this option	303	The default is your opertaing system's default behaviour (most likely
203	explicitly enables or disables it, if possible.	304	enabled), this option explicitly enables or disables it, if possible.
		305
		306	=item keepalive => <boolean>
		307
		308	Enables (default disable) the SO_KEEPALIVE option on the stream socket:
		309	normally, TCP connections have no time-out once established, so TCP
		310	connections, once established, can stay alive forever even when the other
		311	side has long gone. TCP keepalives are a cheap way to take down long-lived
		312	TCP connections whent he other side becomes unreachable. While the default
		313	is OS-dependent, TCP keepalives usually kick in after around two hours,
		314	and, if the other side doesn't reply, take down the TCP connection some 10
		315	to 15 minutes later.
		316
		317	It is harmless to specify this option for file handles that do not support
		318	keepalives, and enabling it on connections that are potentially long-lived
		319	is usually a good idea.
		320
		321	=item oobinline => <boolean>
		322
		323	BSD majorly fucked up the implementation of TCP urgent data. The result
		324	is that almost no OS implements TCP according to the specs, and every OS
		325	implements it slightly differently.
		326
		327	If you want to handle TCP urgent data, then setting this flag (the default
		328	is enabled) gives you the most portable way of getting urgent data, by
		329	putting it into the stream.
		330
		331	Since BSD emulation of OOB data on top of TCP's urgent data can have
		332	security implications, AnyEvent::Handle sets this flag automatically
		333	unless explicitly specified. Note that setting this flag after
		334	establishing a connection I<may> be a bit too late (data loss could
		335	already have occured on BSD systems), but at least it will protect you
		336	from most attacks.
204		337
205	=item read_size => <bytes>	338	=item read_size => <bytes>
206		339
207	The default read block size (the amount of bytes this module will try to read	340	The default read block size (the amount of bytes this module will
208	during each (loop iteration). Default: C<8192>.	341	try to read during each loop iteration, which affects memory
		342	requirements). Default: C<8192>.
209		343
210	=item low_water_mark => <bytes>	344	=item low_water_mark => <bytes>
211		345
212	Sets the amount of bytes (default: C<0>) that make up an "empty" write	346	Sets the amount of bytes (default: C<0>) that make up an "empty" write
213	buffer: If the write reaches this size or gets even samller it is	347	buffer: If the write reaches this size or gets even samller it is
214	considered empty.	348	considered empty.
215		349
		350	Sometimes it can be beneficial (for performance reasons) to add data to
		351	the write buffer before it is fully drained, but this is a rare case, as
		352	the operating system kernel usually buffers data as well, so the default
		353	is good in almost all cases.
		354
216	=item linger => <seconds>	355	=item linger => <seconds>
217		356
218	If non-zero (default: C<3600>), then the destructor of the	357	If non-zero (default: C<3600>), then the destructor of the
219	AnyEvent::Handle object will check wether there is still outstanding write	358	AnyEvent::Handle object will check whether there is still outstanding
220	data and will install a watcher that will write out this data. No errors	359	write data and will install a watcher that will write this data to the
221	will be reported (this mostly matches how the operating system treats	360	socket. No errors will be reported (this mostly matches how the operating
222	outstanding data at socket close time).	361	system treats outstanding data at socket close time).
223		362
224	This will not work for partial TLS data that could not yet been	363	This will not work for partial TLS data that could not be encoded
225	encoded. This data will be lost.	364	yet. This data will be lost. Calling the C<stoptls> method in time might
		365	help.
		366
		367	=item peername => $string
		368
		369	A string used to identify the remote site - usually the DNS hostname
		370	(I<not> IDN!) used to create the connection, rarely the IP address.
		371
		372	Apart from being useful in error messages, this string is also used in TLS
		373	peername verification (see C<verify_peername> in L<AnyEvent::TLS>). This
		374	verification will be skipped when C<peername> is not specified or
		375	C<undef>.
226		376
227	=item tls => "accept" | "connect" | Net::SSLeay::SSL object	377	=item tls => "accept" | "connect" | Net::SSLeay::SSL object
228		378
229	When this parameter is given, it enables TLS (SSL) mode, that means it	379	When this parameter is given, it enables TLS (SSL) mode, that means
230	will start making tls handshake and will transparently encrypt/decrypt	380	AnyEvent will start a TLS handshake as soon as the connection has been
231	data.	381	established and will transparently encrypt/decrypt data afterwards.
		382
		383	All TLS protocol errors will be signalled as C<EPROTO>, with an
		384	appropriate error message.
232		385
233	TLS mode requires Net::SSLeay to be installed (it will be loaded	386	TLS mode requires Net::SSLeay to be installed (it will be loaded
234	automatically when you try to create a TLS handle).	387	automatically when you try to create a TLS handle): this module doesn't
		388	have a dependency on that module, so if your module requires it, you have
		389	to add the dependency yourself.
235		390
236	For the TLS server side, use C<accept>, and for the TLS client side of a	391	Unlike TCP, TLS has a server and client side: for the TLS server side, use
237	connection, use C<connect> mode.	392	C<accept>, and for the TLS client side of a connection, use C<connect>
		393	mode.
238		394
239	You can also provide your own TLS connection object, but you have	395	You can also provide your own TLS connection object, but you have
240	to make sure that you call either C<Net::SSLeay::set_connect_state>	396	to make sure that you call either C<Net::SSLeay::set_connect_state>
241	or C<Net::SSLeay::set_accept_state> on it before you pass it to	397	or C<Net::SSLeay::set_accept_state> on it before you pass it to
242	AnyEvent::Handle.	398	AnyEvent::Handle. Also, this module will take ownership of this connection
		399	object.
243		400
		401	At some future point, AnyEvent::Handle might switch to another TLS
		402	implementation, then the option to use your own session object will go
		403	away.
		404
		405	B<IMPORTANT:> since Net::SSLeay "objects" are really only integers,
		406	passing in the wrong integer will lead to certain crash. This most often
		407	happens when one uses a stylish C<< tls => 1 >> and is surprised about the
		408	segmentation fault.
		409
244	See the C<starttls> method if you need to start TLS negotiation later.	410	See the C<< ->starttls >> method for when need to start TLS negotiation later.
245		411
246	=item tls_ctx => $ssl_ctx	412	=item tls_ctx => $anyevent_tls
247		413
248	Use the given Net::SSLeay::CTX object to create the new TLS connection	414	Use the given C<AnyEvent::TLS> object to create the new TLS connection
249	(unless a connection object was specified directly). If this parameter is	415	(unless a connection object was specified directly). If this parameter is
250	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	416	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
251		417
		418	Instead of an object, you can also specify a hash reference with C<< key
		419	=> value >> pairs. Those will be passed to L<AnyEvent::TLS> to create a
		420	new TLS context object.
		421
		422	=item on_starttls => $cb->($handle, $success[, $error_message])
		423
		424	This callback will be invoked when the TLS/SSL handshake has finished. If
		425	C<$success> is true, then the TLS handshake succeeded, otherwise it failed
		426	(C<on_stoptls> will not be called in this case).
		427
		428	The session in C<< $handle->{tls} >> can still be examined in this
		429	callback, even when the handshake was not successful.
		430
		431	TLS handshake failures will not cause C<on_error> to be invoked when this
		432	callback is in effect, instead, the error message will be passed to C<on_starttls>.
		433
		434	Without this callback, handshake failures lead to C<on_error> being
		435	called, as normal.
		436
		437	Note that you cannot call C<starttls> right again in this callback. If you
		438	need to do that, start an zero-second timer instead whose callback can
		439	then call C<< ->starttls >> again.
		440
		441	=item on_stoptls => $cb->($handle)
		442
		443	When a SSLv3/TLS shutdown/close notify/EOF is detected and this callback is
		444	set, then it will be invoked after freeing the TLS session. If it is not,
		445	then a TLS shutdown condition will be treated like a normal EOF condition
		446	on the handle.
		447
		448	The session in C<< $handle->{tls} >> can still be examined in this
		449	callback.
		450
		451	This callback will only be called on TLS shutdowns, not when the
		452	underlying handle signals EOF.
		453
252	=item json => JSON or JSON::XS object	454	=item json => JSON or JSON::XS object
253		455
254	This is the json coder object used by the C<json> read and write types.	456	This is the json coder object used by the C<json> read and write types.
255		457
256	If you don't supply it, then AnyEvent::Handle will create and use a	458	If you don't supply it, then AnyEvent::Handle will create and use a
257	suitable one, which will write and expect UTF-8 encoded JSON texts.	459	suitable one (on demand), which will write and expect UTF-8 encoded JSON
		460	texts.
258		461
259	Note that you are responsible to depend on the JSON module if you want to	462	Note that you are responsible to depend on the JSON module if you want to
260	use this functionality, as AnyEvent does not have a dependency itself.	463	use this functionality, as AnyEvent does not have a dependency itself.
261		464
262	=item filter_r => $cb
263
264	=item filter_w => $cb
265
266	These exist, but are undocumented at this time.
267
268	=back	465	=back
269		466
270	=cut	467	=cut
271		468
272	sub new {	469	sub new {
273	my $class = shift;	470	my $class = shift;
274
275	my $self = bless { @_ }, $class;	471	my $self = bless { @_ }, $class;
276		472
277	$self->{fh} or Carp::croak "mandatory argument fh is missing";	473	if ($self->{fh}) {
		474	$self->_start;
		475	return unless $self->{fh}; # could be gone by now
		476
		477	} elsif ($self->{connect}) {
		478	require AnyEvent::Socket;
		479
		480	$self->{peername} = $self->{connect}[0]
		481	unless exists $self->{peername};
		482
		483	$self->{_skip_drain_rbuf} = 1;
		484
		485	{
		486	Scalar::Util::weaken (my $self = $self);
		487
		488	$self->{_connect} =
		489	AnyEvent::Socket::tcp_connect (
		490	$self->{connect}[0],
		491	$self->{connect}[1],
		492	sub {
		493	my ($fh, $host, $port, $retry) = @_;
		494
		495	if ($fh) {
		496	$self->{fh} = $fh;
		497
		498	delete $self->{_skip_drain_rbuf};
		499	$self->_start;
		500
		501	$self->{on_connect}
		502	and $self->{on_connect}($self, $host, $port, sub {
		503	delete @$self{qw(fh _tw _rtw _wtw _ww _rw _eof _queue rbuf _wbuf tls _tls_rbuf _tls_wbuf)};
		504	$self->{_skip_drain_rbuf} = 1;
		505	&$retry;
		506	});
		507
		508	} else {
		509	if ($self->{on_connect_error}) {
		510	$self->{on_connect_error}($self, "$!");
		511	$self->destroy;
		512	} else {
		513	$self->_error ($!, 1);
		514	}
		515	}
		516	},
		517	sub {
		518	local $self->{fh} = $_[0];
		519
		520	$self->{on_prepare}
		521	? $self->{on_prepare}->($self)
		522	: ()
		523	}
		524	);
		525	}
		526
		527	} else {
		528	Carp::croak "AnyEvent::Handle: either an existing fh or the connect parameter must be specified";
		529	}
		530
		531	$self
		532	}
		533
		534	sub _start {
		535	my ($self) = @_;
		536
		537	# too many clueless people try to use udp and similar sockets
		538	# with AnyEvent::Handle, do them a favour.
		539	my $type = getsockopt $self->{fh}, Socket::SOL_SOCKET (), Socket::SO_TYPE ();
		540	Carp::croak "AnyEvent::Handle: only stream sockets supported, anything else will NOT work!"
		541	if Socket::SOCK_STREAM () != (unpack "I", $type) && defined $type;
278		542
279	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	543	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
280		544
281	if ($self->{tls}) {	545	$self->{_activity} =
282	require Net::SSLeay;	546	$self->{_ractivity} =
		547	$self->{_wactivity} = AE::now;
		548
		549	$self->timeout (delete $self->{timeout} ) if $self->{timeout};
		550	$self->rtimeout (delete $self->{rtimeout} ) if $self->{rtimeout};
		551	$self->wtimeout (delete $self->{wtimeout} ) if $self->{wtimeout};
		552
		553	$self->no_delay (delete $self->{no_delay} ) if exists $self->{no_delay} && $self->{no_delay};
		554	$self->keepalive (delete $self->{keepalive}) if exists $self->{keepalive} && $self->{keepalive};
		555
		556	$self->oobinline (exists $self->{oobinline} ? delete $self->{oobinline} : 1);
		557
283	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});	558	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})
284	}	559	if $self->{tls};
285		560
286	$self->{_activity} = AnyEvent->now;
287	$self->_timeout;
288
289	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};	561	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};
290	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};
291		562
292	$self->start_read	563	$self->start_read
293	if $self->{on_read};	564	if $self->{on_read} || @{ $self->{_queue} };
294		565
295	$self	566	$self->_drain_wbuf;
296	}
297
298	sub _shutdown {
299	my ($self) = @_;
300
301	delete $self->{_tw};
302	delete $self->{_rw};
303	delete $self->{_ww};
304	delete $self->{fh};
305
306	$self->stoptls;
307
308	delete $self->{on_read};
309	delete $self->{_queue};
310	}	567	}
311		568
312	sub _error {	569	sub _error {
313	my ($self, $errno, $fatal) = @_;	570	my ($self, $errno, $fatal, $message) = @_;
314
315	$self->_shutdown
316	if $fatal;
317		571
318	$! = $errno;	572	$! = $errno;
		573	$message ||= "$!";
319		574
320	if ($self->{on_error}) {	575	if ($self->{on_error}) {
321	$self->{on_error}($self, $fatal);	576	$self->{on_error}($self, $fatal, $message);
322	} else {	577	$self->destroy if $fatal;
		578	} elsif ($self->{fh} || $self->{connect}) {
		579	$self->destroy;
323	Carp::croak "AnyEvent::Handle uncaught error: $!";	580	Carp::croak "AnyEvent::Handle uncaught error: $message";
324	}	581	}
325	}	582	}
326		583
327	=item $fh = $handle->fh	584	=item $fh = $handle->fh
328		585
329	This method returns the file handle of the L<AnyEvent::Handle> object.	586	This method returns the file handle used to create the L<AnyEvent::Handle> object.
330		587
331	=cut	588	=cut
332		589
333	sub fh { $_[0]{fh} }	590	sub fh { $_[0]{fh} }
334		591
…		…
352	$_[0]{on_eof} = $_[1];	609	$_[0]{on_eof} = $_[1];
353	}	610	}
354		611
355	=item $handle->on_timeout ($cb)	612	=item $handle->on_timeout ($cb)
356		613
357	Replace the current C<on_timeout> callback, or disables the callback	614	=item $handle->on_rtimeout ($cb)
358	(but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor
359	argument.
360		615
361	=cut	616	=item $handle->on_wtimeout ($cb)
362		617
363	sub on_timeout {	618	Replace the current C<on_timeout>, C<on_rtimeout> or C<on_wtimeout>
364	$_[0]{on_timeout} = $_[1];	619	callback, or disables the callback (but not the timeout) if C<$cb> =
365	}	620	C<undef>. See the C<timeout> constructor argument and method.
		621
		622	=cut
		623
		624	# see below
366		625
367	=item $handle->autocork ($boolean)	626	=item $handle->autocork ($boolean)
368		627
369	Enables or disables the current autocork behaviour (see C<autocork>	628	Enables or disables the current autocork behaviour (see C<autocork>
370	constructor argument).	629	constructor argument). Changes will only take effect on the next write.
371		630
372	=cut	631	=cut
		632
		633	sub autocork {
		634	$_[0]{autocork} = $_[1];
		635	}
373		636
374	=item $handle->no_delay ($boolean)	637	=item $handle->no_delay ($boolean)
375		638
376	Enables or disables the C<no_delay> setting (see constructor argument of	639	Enables or disables the C<no_delay> setting (see constructor argument of
377	the same name for details).	640	the same name for details).
…		…
381	sub no_delay {	644	sub no_delay {
382	$_[0]{no_delay} = $_[1];	645	$_[0]{no_delay} = $_[1];
383		646
384	eval {	647	eval {
385	local $SIG{__DIE__};	648	local $SIG{__DIE__};
386	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1];	649	setsockopt $_[0]{fh}, Socket::IPPROTO_TCP (), Socket::TCP_NODELAY (), int $_[1]
		650	if $_[0]{fh};
387	};	651	};
388	}	652	}
389		653
		654	=item $handle->keepalive ($boolean)
		655
		656	Enables or disables the C<keepalive> setting (see constructor argument of
		657	the same name for details).
		658
		659	=cut
		660
		661	sub keepalive {
		662	$_[0]{keepalive} = $_[1];
		663
		664	eval {
		665	local $SIG{__DIE__};
		666	setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_KEEPALIVE (), int $_[1]
		667	if $_[0]{fh};
		668	};
		669	}
		670
		671	=item $handle->oobinline ($boolean)
		672
		673	Enables or disables the C<oobinline> setting (see constructor argument of
		674	the same name for details).
		675
		676	=cut
		677
		678	sub oobinline {
		679	$_[0]{oobinline} = $_[1];
		680
		681	eval {
		682	local $SIG{__DIE__};
		683	setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_OOBINLINE (), int $_[1]
		684	if $_[0]{fh};
		685	};
		686	}
		687
		688	=item $handle->keepalive ($boolean)
		689
		690	Enables or disables the C<keepalive> setting (see constructor argument of
		691	the same name for details).
		692
		693	=cut
		694
		695	sub keepalive {
		696	$_[0]{keepalive} = $_[1];
		697
		698	eval {
		699	local $SIG{__DIE__};
		700	setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_KEEPALIVE (), int $_[1]
		701	if $_[0]{fh};
		702	};
		703	}
		704
		705	=item $handle->on_starttls ($cb)
		706
		707	Replace the current C<on_starttls> callback (see the C<on_starttls> constructor argument).
		708
		709	=cut
		710
		711	sub on_starttls {
		712	$_[0]{on_starttls} = $_[1];
		713	}
		714
		715	=item $handle->on_stoptls ($cb)
		716
		717	Replace the current C<on_stoptls> callback (see the C<on_stoptls> constructor argument).
		718
		719	=cut
		720
		721	sub on_stoptls {
		722	$_[0]{on_stoptls} = $_[1];
		723	}
		724
		725	=item $handle->rbuf_max ($max_octets)
		726
		727	Configures the C<rbuf_max> setting (C<undef> disables it).
		728
		729	=cut
		730
		731	sub rbuf_max {
		732	$_[0]{rbuf_max} = $_[1];
		733	}
		734
390	#############################################################################	735	#############################################################################
391		736
392	=item $handle->timeout ($seconds)	737	=item $handle->timeout ($seconds)
393		738
		739	=item $handle->rtimeout ($seconds)
		740
		741	=item $handle->wtimeout ($seconds)
		742
394	Configures (or disables) the inactivity timeout.	743	Configures (or disables) the inactivity timeout.
395		744
396	=cut	745	=item $handle->timeout_reset
397		746
398	sub timeout {	747	=item $handle->rtimeout_reset
		748
		749	=item $handle->wtimeout_reset
		750
		751	Reset the activity timeout, as if data was received or sent.
		752
		753	These methods are cheap to call.
		754
		755	=cut
		756
		757	for my $dir ("", "r", "w") {
		758	my $timeout = "${dir}timeout";
		759	my $tw = "_${dir}tw";
		760	my $on_timeout = "on_${dir}timeout";
		761	my $activity = "_${dir}activity";
		762	my $cb;
		763
		764	*$on_timeout = sub {
		765	$_[0]{$on_timeout} = $_[1];
		766	};
		767
		768	*$timeout = sub {
399	my ($self, $timeout) = @_;	769	my ($self, $new_value) = @_;
400		770
401	$self->{timeout} = $timeout;	771	$self->{$timeout} = $new_value;
402	$self->_timeout;	772	delete $self->{$tw}; &$cb;
403	}	773	};
404		774
		775	*{"${dir}timeout_reset"} = sub {
		776	$_[0]{$activity} = AE::now;
		777	};
		778
		779	# main workhorse:
405	# reset the timeout watcher, as neccessary	780	# reset the timeout watcher, as neccessary
406	# also check for time-outs	781	# also check for time-outs
407	sub _timeout {	782	$cb = sub {
408	my ($self) = @_;	783	my ($self) = @_;
409		784
410	if ($self->{timeout}) {	785	if ($self->{$timeout} && $self->{fh}) {
411	my $NOW = AnyEvent->now;	786	my $NOW = AE::now;
412		787
413	# when would the timeout trigger?	788	# when would the timeout trigger?
414	my $after = $self->{_activity} + $self->{timeout} - $NOW;	789	my $after = $self->{$activity} + $self->{$timeout} - $NOW;
415		790
416	# now or in the past already?	791	# now or in the past already?
417	if ($after <= 0) {	792	if ($after <= 0) {
418	$self->{_activity} = $NOW;	793	$self->{$activity} = $NOW;
419		794
420	if ($self->{on_timeout}) {	795	if ($self->{$on_timeout}) {
421	$self->{on_timeout}($self);	796	$self->{$on_timeout}($self);
422	} else {	797	} else {
423	$self->_error (&Errno::ETIMEDOUT);	798	$self->_error (Errno::ETIMEDOUT);
		799	}
		800
		801	# callback could have changed timeout value, optimise
		802	return unless $self->{$timeout};
		803
		804	# calculate new after
		805	$after = $self->{$timeout};
424	}	806	}
425		807
426	# callback could have changed timeout value, optimise	808	Scalar::Util::weaken $self;
427	return unless $self->{timeout};	809	return unless $self; # ->error could have destroyed $self
428		810
429	# calculate new after	811	$self->{$tw} ||= AE::timer $after, 0, sub {
430	$after = $self->{timeout};	812	delete $self->{$tw};
		813	$cb->($self);
		814	};
		815	} else {
		816	delete $self->{$tw};
431	}	817	}
432
433	Scalar::Util::weaken $self;
434	return unless $self; # ->error could have destroyed $self
435
436	$self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub {
437	delete $self->{_tw};
438	$self->_timeout;
439	});
440	} else {
441	delete $self->{_tw};
442	}	818	}
443	}	819	}
444		820
445	#############################################################################	821	#############################################################################
446		822
…		…
462	=item $handle->on_drain ($cb)	838	=item $handle->on_drain ($cb)
463		839
464	Sets the C<on_drain> callback or clears it (see the description of	840	Sets the C<on_drain> callback or clears it (see the description of
465	C<on_drain> in the constructor).	841	C<on_drain> in the constructor).
466		842
		843	This method may invoke callbacks (and therefore the handle might be
		844	destroyed after it returns).
		845
467	=cut	846	=cut
468		847
469	sub on_drain {	848	sub on_drain {
470	my ($self, $cb) = @_;	849	my ($self, $cb) = @_;
471		850
472	$self->{on_drain} = $cb;	851	$self->{on_drain} = $cb;
473		852
474	$cb->($self)	853	$cb->($self)
475	if $cb && $self->{low_water_mark} >= length $self->{wbuf};	854	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});
476	}	855	}
477		856
478	=item $handle->push_write ($data)	857	=item $handle->push_write ($data)
479		858
480	Queues the given scalar to be written. You can push as much data as you	859	Queues the given scalar to be written. You can push as much data as you
481	want (only limited by the available memory), as C<AnyEvent::Handle>	860	want (only limited by the available memory), as C<AnyEvent::Handle>
482	buffers it independently of the kernel.	861	buffers it independently of the kernel.
483		862
		863	This method may invoke callbacks (and therefore the handle might be
		864	destroyed after it returns).
		865
484	=cut	866	=cut
485		867
486	sub _drain_wbuf {	868	sub _drain_wbuf {
487	my ($self) = @_;	869	my ($self) = @_;
488		870
…		…
491	Scalar::Util::weaken $self;	873	Scalar::Util::weaken $self;
492		874
493	my $cb = sub {	875	my $cb = sub {
494	my $len = syswrite $self->{fh}, $self->{wbuf};	876	my $len = syswrite $self->{fh}, $self->{wbuf};
495		877
496	if ($len >= 0) {	878	if (defined $len) {
497	substr $self->{wbuf}, 0, $len, "";	879	substr $self->{wbuf}, 0, $len, "";
498		880
499	$self->{_activity} = AnyEvent->now;	881	$self->{_activity} = $self->{_wactivity} = AE::now;
500		882
501	$self->{on_drain}($self)	883	$self->{on_drain}($self)
502	if $self->{low_water_mark} >= length $self->{wbuf}	884	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
503	&& $self->{on_drain};	885	&& $self->{on_drain};
504		886
505	delete $self->{_ww} unless length $self->{wbuf};	887	delete $self->{_ww} unless length $self->{wbuf};
506	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	888	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
507	$self->_error ($!, 1);	889	$self->_error ($!, 1);
…		…
510		892
511	# try to write data immediately	893	# try to write data immediately
512	$cb->() unless $self->{autocork};	894	$cb->() unless $self->{autocork};
513		895
514	# if still data left in wbuf, we need to poll	896	# if still data left in wbuf, we need to poll
515	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)	897	$self->{_ww} = AE::io $self->{fh}, 1, $cb
516	if length $self->{wbuf};	898	if length $self->{wbuf};
517	};	899	};
518	}	900	}
519		901
520	our %WH;	902	our %WH;
521		903
		904	# deprecated
522	sub register_write_type($$) {	905	sub register_write_type($$) {
523	$WH{$_[0]} = $_[1];	906	$WH{$_[0]} = $_[1];
524	}	907	}
525		908
526	sub push_write {	909	sub push_write {
527	my $self = shift;	910	my $self = shift;
528		911
529	if (@_ > 1) {	912	if (@_ > 1) {
530	my $type = shift;	913	my $type = shift;
531		914
		915	@_ = ($WH{$type} ||= _load_func "$type\::anyevent_write_type"
532	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")	916	or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::push_write")
533	->($self, @_);	917	->($self, @_);
534	}	918	}
535		919
		920	# we downgrade here to avoid hard-to-track-down bugs,
		921	# and diagnose the problem earlier and better.
		922
536	if ($self->{filter_w}) {	923	if ($self->{tls}) {
537	$self->{filter_w}($self, \$_[0]);	924	utf8::downgrade $self->{_tls_wbuf} .= $_[0];
		925	&_dotls ($self) if $self->{fh};
538	} else {	926	} else {
539	$self->{wbuf} .= $_[0];	927	utf8::downgrade $self->{wbuf} .= $_[0];
540	$self->_drain_wbuf;	928	$self->_drain_wbuf if $self->{fh};
541	}	929	}
542	}	930	}
543		931
544	=item $handle->push_write (type => @args)	932	=item $handle->push_write (type => @args)
545		933
546	Instead of formatting your data yourself, you can also let this module do	934	Instead of formatting your data yourself, you can also let this module
547	the job by specifying a type and type-specific arguments.	935	do the job by specifying a type and type-specific arguments. You
		936	can also specify the (fully qualified) name of a package, in which
		937	case AnyEvent tries to load the package and then expects to find the
		938	C<anyevent_read_type> function inside (see "custom write types", below).
548		939
549	Predefined types are (if you have ideas for additional types, feel free to	940	Predefined types are (if you have ideas for additional types, feel free to
550	drop by and tell us):	941	drop by and tell us):
551		942
552	=over 4	943	=over 4
…		…
559	=cut	950	=cut
560		951
561	register_write_type netstring => sub {	952	register_write_type netstring => sub {
562	my ($self, $string) = @_;	953	my ($self, $string) = @_;
563		954
564	sprintf "%d:%s,", (length $string), $string	955	(length $string) . ":$string,"
565	};	956	};
566		957
567	=item packstring => $format, $data	958	=item packstring => $format, $data
568		959
569	An octet string prefixed with an encoded length. The encoding C<$format>	960	An octet string prefixed with an encoded length. The encoding C<$format>
…		…
609	Other languages could read single lines terminated by a newline and pass	1000	Other languages could read single lines terminated by a newline and pass
610	this line into their JSON decoder of choice.	1001	this line into their JSON decoder of choice.
611		1002
612	=cut	1003	=cut
613		1004
		1005	sub json_coder() {
		1006	eval { require JSON::XS; JSON::XS->new->utf8 }
		1007	|| do { require JSON; JSON->new->utf8 }
		1008	}
		1009
614	register_write_type json => sub {	1010	register_write_type json => sub {
615	my ($self, $ref) = @_;	1011	my ($self, $ref) = @_;
616		1012
617	require JSON;	1013	my $json = $self->{json} ||= json_coder;
618		1014
619	$self->{json} ? $self->{json}->encode ($ref)	1015	$json->encode ($ref)
620	: JSON::encode_json ($ref)
621	};	1016	};
622		1017
623	=item storable => $reference	1018	=item storable => $reference
624		1019
625	Freezes the given reference using L<Storable> and writes it to the	1020	Freezes the given reference using L<Storable> and writes it to the
…		…
635	pack "w/a*", Storable::nfreeze ($ref)	1030	pack "w/a*", Storable::nfreeze ($ref)
636	};	1031	};
637		1032
638	=back	1033	=back
639		1034
640	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)	1035	=item $handle->push_shutdown
641		1036
642	This function (not method) lets you add your own types to C<push_write>.	1037	Sometimes you know you want to close the socket after writing your data
		1038	before it was actually written. One way to do that is to replace your
		1039	C<on_drain> handler by a callback that shuts down the socket (and set
		1040	C<low_water_mark> to C<0>). This method is a shorthand for just that, and
		1041	replaces the C<on_drain> callback with:
		1042
		1043	sub { shutdown $_[0]{fh}, 1 } # for push_shutdown
		1044
		1045	This simply shuts down the write side and signals an EOF condition to the
		1046	the peer.
		1047
		1048	You can rely on the normal read queue and C<on_eof> handling
		1049	afterwards. This is the cleanest way to close a connection.
		1050
		1051	This method may invoke callbacks (and therefore the handle might be
		1052	destroyed after it returns).
		1053
		1054	=cut
		1055
		1056	sub push_shutdown {
		1057	my ($self) = @_;
		1058
		1059	delete $self->{low_water_mark};
		1060	$self->on_drain (sub { shutdown $_[0]{fh}, 1 });
		1061	}
		1062
		1063	=item custom write types - Package::anyevent_write_type $handle, @args
		1064
		1065	Instead of one of the predefined types, you can also specify the name of
		1066	a package. AnyEvent will try to load the package and then expects to find
		1067	a function named C<anyevent_write_type> inside. If it isn't found, it
		1068	progressively tries to load the parent package until it either finds the
		1069	function (good) or runs out of packages (bad).
		1070
643	Whenever the given C<type> is used, C<push_write> will invoke the code	1071	Whenever the given C<type> is used, C<push_write> will the function with
644	reference with the handle object and the remaining arguments.	1072	the handle object and the remaining arguments.
645		1073
646	The code reference is supposed to return a single octet string that will	1074	The function is supposed to return a single octet string that will be
647	be appended to the write buffer.	1075	appended to the write buffer, so you cna mentally treat this function as a
		1076	"arguments to on-the-wire-format" converter.
648		1077
649	Note that this is a function, and all types registered this way will be	1078	Example: implement a custom write type C<join> that joins the remaining
650	global, so try to use unique names.	1079	arguments using the first one.
		1080
		1081	$handle->push_write (My::Type => " ", 1,2,3);
		1082
		1083	# uses the following package, which can be defined in the "My::Type" or in
		1084	# the "My" modules to be auto-loaded, or just about anywhere when the
		1085	# My::Type::anyevent_write_type is defined before invoking it.
		1086
		1087	package My::Type;
		1088
		1089	sub anyevent_write_type {
		1090	my ($handle, $delim, @args) = @_;
		1091
		1092	join $delim, @args
		1093	}
651		1094
652	=cut	1095	=cut
653		1096
654	#############################################################################	1097	#############################################################################
655		1098
…		…
737	=cut	1180	=cut
738		1181
739	sub _drain_rbuf {	1182	sub _drain_rbuf {
740	my ($self) = @_;	1183	my ($self) = @_;
741		1184
		1185	# avoid recursion
		1186	return if $self->{_skip_drain_rbuf};
742	local $self->{_in_drain} = 1;	1187	local $self->{_skip_drain_rbuf} = 1;
743
744	if (
745	defined $self->{rbuf_max}
746	&& $self->{rbuf_max} < length $self->{rbuf}
747	) {
748	$self->_error (&Errno::ENOSPC, 1), return;
749	}
750		1188
751	while () {	1189	while () {
		1190	# we need to use a separate tls read buffer, as we must not receive data while
		1191	# we are draining the buffer, and this can only happen with TLS.
		1192	$self->{rbuf} .= delete $self->{_tls_rbuf}
		1193	if exists $self->{_tls_rbuf};
		1194
752	my $len = length $self->{rbuf};	1195	my $len = length $self->{rbuf};
753		1196
754	if (my $cb = shift @{ $self->{_queue} }) {	1197	if (my $cb = shift @{ $self->{_queue} }) {
755	unless ($cb->($self)) {	1198	unless ($cb->($self)) {
756	if ($self->{_eof}) {	1199	# no progress can be made
757	# no progress can be made (not enough data and no data forthcoming)	1200	# (not enough data and no data forthcoming)
758	$self->_error (&Errno::EPIPE, 1), return;	1201	$self->_error (Errno::EPIPE, 1), return
759	}	1202	if $self->{_eof};
760		1203
761	unshift @{ $self->{_queue} }, $cb;	1204	unshift @{ $self->{_queue} }, $cb;
762	last;	1205	last;
763	}	1206	}
764	} elsif ($self->{on_read}) {	1207	} elsif ($self->{on_read}) {
…		…
771	&& !@{ $self->{_queue} } # and the queue is still empty	1214	&& !@{ $self->{_queue} } # and the queue is still empty
772	&& $self->{on_read} # but we still have on_read	1215	&& $self->{on_read} # but we still have on_read
773	) {	1216	) {
774	# no further data will arrive	1217	# no further data will arrive
775	# so no progress can be made	1218	# so no progress can be made
776	$self->_error (&Errno::EPIPE, 1), return	1219	$self->_error (Errno::EPIPE, 1), return
777	if $self->{_eof};	1220	if $self->{_eof};
778		1221
779	last; # more data might arrive	1222	last; # more data might arrive
780	}	1223	}
781	} else {	1224	} else {
782	# read side becomes idle	1225	# read side becomes idle
783	delete $self->{_rw};	1226	delete $self->{_rw} unless $self->{tls};
784	last;	1227	last;
785	}	1228	}
786	}	1229	}
787		1230
788	if ($self->{_eof}) {	1231	if ($self->{_eof}) {
789	if ($self->{on_eof}) {	1232	$self->{on_eof}
790	$self->{on_eof}($self)	1233	? $self->{on_eof}($self)
791	} else {	1234	: $self->_error (0, 1, "Unexpected end-of-file");
792	$self->_error (0, 1);	1235
793	}	1236	return;
		1237	}
		1238
		1239	if (
		1240	defined $self->{rbuf_max}
		1241	&& $self->{rbuf_max} < length $self->{rbuf}
		1242	) {
		1243	$self->_error (Errno::ENOSPC, 1), return;
794	}	1244	}
795		1245
796	# may need to restart read watcher	1246	# may need to restart read watcher
797	unless ($self->{_rw}) {	1247	unless ($self->{_rw}) {
798	$self->start_read	1248	$self->start_read
…		…
804		1254
805	This replaces the currently set C<on_read> callback, or clears it (when	1255	This replaces the currently set C<on_read> callback, or clears it (when
806	the new callback is C<undef>). See the description of C<on_read> in the	1256	the new callback is C<undef>). See the description of C<on_read> in the
807	constructor.	1257	constructor.
808		1258
		1259	This method may invoke callbacks (and therefore the handle might be
		1260	destroyed after it returns).
		1261
809	=cut	1262	=cut
810		1263
811	sub on_read {	1264	sub on_read {
812	my ($self, $cb) = @_;	1265	my ($self, $cb) = @_;
813		1266
814	$self->{on_read} = $cb;	1267	$self->{on_read} = $cb;
815	$self->_drain_rbuf if $cb && !$self->{_in_drain};	1268	$self->_drain_rbuf if $cb;
816	}	1269	}
817		1270
818	=item $handle->rbuf	1271	=item $handle->rbuf
819		1272
820	Returns the read buffer (as a modifiable lvalue).	1273	Returns the read buffer (as a modifiable lvalue).
821		1274
822	You can access the read buffer directly as the C<< ->{rbuf} >> member, if	1275	You can access the read buffer directly as the C<< ->{rbuf} >>
823	you want.	1276	member, if you want. However, the only operation allowed on the
		1277	read buffer (apart from looking at it) is removing data from its
		1278	beginning. Otherwise modifying or appending to it is not allowed and will
		1279	lead to hard-to-track-down bugs.
824		1280
825	NOTE: The read buffer should only be used or modified if the C<on_read>,	1281	NOTE: The read buffer should only be used or modified if the C<on_read>,
826	C<push_read> or C<unshift_read> methods are used. The other read methods	1282	C<push_read> or C<unshift_read> methods are used. The other read methods
827	automatically manage the read buffer.	1283	automatically manage the read buffer.
828		1284
…		…
849		1305
850	If enough data was available, then the callback must remove all data it is	1306	If enough data was available, then the callback must remove all data it is
851	interested in (which can be none at all) and return a true value. After returning	1307	interested in (which can be none at all) and return a true value. After returning
852	true, it will be removed from the queue.	1308	true, it will be removed from the queue.
853		1309
		1310	These methods may invoke callbacks (and therefore the handle might be
		1311	destroyed after it returns).
		1312
854	=cut	1313	=cut
855		1314
856	our %RH;	1315	our %RH;
857		1316
858	sub register_read_type($$) {	1317	sub register_read_type($$) {
…		…
864	my $cb = pop;	1323	my $cb = pop;
865		1324
866	if (@_) {	1325	if (@_) {
867	my $type = shift;	1326	my $type = shift;
868		1327
		1328	$cb = ($RH{$type} ||= _load_func "$type\::anyevent_read_type"
869	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")	1329	or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::push_read")
870	->($self, $cb, @_);	1330	->($self, $cb, @_);
871	}	1331	}
872		1332
873	push @{ $self->{_queue} }, $cb;	1333	push @{ $self->{_queue} }, $cb;
874	$self->_drain_rbuf unless $self->{_in_drain};	1334	$self->_drain_rbuf;
875	}	1335	}
876		1336
877	sub unshift_read {	1337	sub unshift_read {
878	my $self = shift;	1338	my $self = shift;
879	my $cb = pop;	1339	my $cb = pop;
…		…
883		1343
884	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read")	1344	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read")
885	->($self, $cb, @_);	1345	->($self, $cb, @_);
886	}	1346	}
887		1347
888
889	unshift @{ $self->{_queue} }, $cb;	1348	unshift @{ $self->{_queue} }, $cb;
890	$self->_drain_rbuf unless $self->{_in_drain};	1349	$self->_drain_rbuf;
891	}	1350	}
892		1351
893	=item $handle->push_read (type => @args, $cb)	1352	=item $handle->push_read (type => @args, $cb)
894		1353
895	=item $handle->unshift_read (type => @args, $cb)	1354	=item $handle->unshift_read (type => @args, $cb)
896		1355
897	Instead of providing a callback that parses the data itself you can chose	1356	Instead of providing a callback that parses the data itself you can chose
898	between a number of predefined parsing formats, for chunks of data, lines	1357	between a number of predefined parsing formats, for chunks of data, lines
899	etc.	1358	etc. You can also specify the (fully qualified) name of a package, in
		1359	which case AnyEvent tries to load the package and then expects to find the
		1360	C<anyevent_read_type> function inside (see "custom read types", below).
900		1361
901	Predefined types are (if you have ideas for additional types, feel free to	1362	Predefined types are (if you have ideas for additional types, feel free to
902	drop by and tell us):	1363	drop by and tell us):
903		1364
904	=over 4	1365	=over 4
…		…
1028	return 1;	1489	return 1;
1029	}	1490	}
1030		1491
1031	# reject	1492	# reject
1032	if ($reject && $$rbuf =~ $reject) {	1493	if ($reject && $$rbuf =~ $reject) {
1033	$self->_error (&Errno::EBADMSG);	1494	$self->_error (Errno::EBADMSG);
1034	}	1495	}
1035		1496
1036	# skip	1497	# skip
1037	if ($skip && $$rbuf =~ $skip) {	1498	if ($skip && $$rbuf =~ $skip) {
1038	$data .= substr $$rbuf, 0, $+[0], "";	1499	$data .= substr $$rbuf, 0, $+[0], "";
…		…
1054	my ($self, $cb) = @_;	1515	my ($self, $cb) = @_;
1055		1516
1056	sub {	1517	sub {
1057	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {	1518	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {
1058	if ($_[0]{rbuf} =~ /[^0-9]/) {	1519	if ($_[0]{rbuf} =~ /[^0-9]/) {
1059	$self->_error (&Errno::EBADMSG);	1520	$self->_error (Errno::EBADMSG);
1060	}	1521	}
1061	return;	1522	return;
1062	}	1523	}
1063		1524
1064	my $len = $1;	1525	my $len = $1;
…		…
1067	my $string = $_[1];	1528	my $string = $_[1];
1068	$_[0]->unshift_read (chunk => 1, sub {	1529	$_[0]->unshift_read (chunk => 1, sub {
1069	if ($_[1] eq ",") {	1530	if ($_[1] eq ",") {
1070	$cb->($_[0], $string);	1531	$cb->($_[0], $string);
1071	} else {	1532	} else {
1072	$self->_error (&Errno::EBADMSG);	1533	$self->_error (Errno::EBADMSG);
1073	}	1534	}
1074	});	1535	});
1075	});	1536	});
1076		1537
1077	1	1538	1
…		…
1083	An octet string prefixed with an encoded length. The encoding C<$format>	1544	An octet string prefixed with an encoded length. The encoding C<$format>
1084	uses the same format as a Perl C<pack> format, but must specify a single	1545	uses the same format as a Perl C<pack> format, but must specify a single
1085	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an	1546	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
1086	optional C<!>, C<< < >> or C<< > >> modifier).	1547	optional C<!>, C<< < >> or C<< > >> modifier).
1087		1548
1088	DNS over TCP uses a prefix of C<n>, EPP uses a prefix of C<N>.	1549	For example, DNS over TCP uses a prefix of C<n> (2 octet network order),
		1550	EPP uses a prefix of C<N> (4 octtes).
1089		1551
1090	Example: read a block of data prefixed by its length in BER-encoded	1552	Example: read a block of data prefixed by its length in BER-encoded
1091	format (very efficient).	1553	format (very efficient).
1092		1554
1093	$handle->push_read (packstring => "w", sub {	1555	$handle->push_read (packstring => "w", sub {
…		…
1123	}	1585	}
1124	};	1586	};
1125		1587
1126	=item json => $cb->($handle, $hash_or_arrayref)	1588	=item json => $cb->($handle, $hash_or_arrayref)
1127		1589
1128	Reads a JSON object or array, decodes it and passes it to the callback.	1590	Reads a JSON object or array, decodes it and passes it to the
		1591	callback. When a parse error occurs, an C<EBADMSG> error will be raised.
1129		1592
1130	If a C<json> object was passed to the constructor, then that will be used	1593	If a C<json> object was passed to the constructor, then that will be used
1131	for the final decode, otherwise it will create a JSON coder expecting UTF-8.	1594	for the final decode, otherwise it will create a JSON coder expecting UTF-8.
1132		1595
1133	This read type uses the incremental parser available with JSON version	1596	This read type uses the incremental parser available with JSON version
…		…
1142	=cut	1605	=cut
1143		1606
1144	register_read_type json => sub {	1607	register_read_type json => sub {
1145	my ($self, $cb) = @_;	1608	my ($self, $cb) = @_;
1146		1609
1147	require JSON;	1610	my $json = $self->{json} ||= json_coder;
1148		1611
1149	my $data;	1612	my $data;
1150	my $rbuf = \$self->{rbuf};	1613	my $rbuf = \$self->{rbuf};
1151		1614
1152	my $json = $self->{json} ||= JSON->new->utf8;
1153
1154	sub {	1615	sub {
1155	my $ref = $json->incr_parse ($self->{rbuf});	1616	my $ref = eval { $json->incr_parse ($self->{rbuf}) };
1156		1617
1157	if ($ref) {	1618	if ($ref) {
1158	$self->{rbuf} = $json->incr_text;	1619	$self->{rbuf} = $json->incr_text;
1159	$json->incr_text = "";	1620	$json->incr_text = "";
1160	$cb->($self, $ref);	1621	$cb->($self, $ref);
1161		1622
1162	1	1623	1
		1624	} elsif ($@) {
		1625	# error case
		1626	$json->incr_skip;
		1627
		1628	$self->{rbuf} = $json->incr_text;
		1629	$json->incr_text = "";
		1630
		1631	$self->_error (Errno::EBADMSG);
		1632
		1633	()
1163	} else {	1634	} else {
1164	$self->{rbuf} = "";	1635	$self->{rbuf} = "";
		1636
1165	()	1637	()
1166	}	1638	}
1167	}	1639	}
1168	};	1640	};
1169		1641
…		…
1201	# read remaining chunk	1673	# read remaining chunk
1202	$_[0]->unshift_read (chunk => $len, sub {	1674	$_[0]->unshift_read (chunk => $len, sub {
1203	if (my $ref = eval { Storable::thaw ($_[1]) }) {	1675	if (my $ref = eval { Storable::thaw ($_[1]) }) {
1204	$cb->($_[0], $ref);	1676	$cb->($_[0], $ref);
1205	} else {	1677	} else {
1206	$self->_error (&Errno::EBADMSG);	1678	$self->_error (Errno::EBADMSG);
1207	}	1679	}
1208	});	1680	});
1209	}	1681	}
1210		1682
1211	1	1683	1
1212	}	1684	}
1213	};	1685	};
1214		1686
1215	=back	1687	=back
1216		1688
1217	=item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args)	1689	=item custom read types - Package::anyevent_read_type $handle, $cb, @args
1218		1690
1219	This function (not method) lets you add your own types to C<push_read>.	1691	Instead of one of the predefined types, you can also specify the name
		1692	of a package. AnyEvent will try to load the package and then expects to
		1693	find a function named C<anyevent_read_type> inside. If it isn't found, it
		1694	progressively tries to load the parent package until it either finds the
		1695	function (good) or runs out of packages (bad).
1220		1696
1221	Whenever the given C<type> is used, C<push_read> will invoke the code	1697	Whenever this type is used, C<push_read> will invoke the function with the
1222	reference with the handle object, the callback and the remaining	1698	handle object, the original callback and the remaining arguments.
1223	arguments.
1224		1699
1225	The code reference is supposed to return a callback (usually a closure)	1700	The function is supposed to return a callback (usually a closure) that
1226	that works as a plain read callback (see C<< ->push_read ($cb) >>).	1701	works as a plain read callback (see C<< ->push_read ($cb) >>), so you can
		1702	mentally treat the function as a "configurable read type to read callback"
		1703	converter.
1227		1704
1228	It should invoke the passed callback when it is done reading (remember to	1705	It should invoke the original callback when it is done reading (remember
1229	pass C<$handle> as first argument as all other callbacks do that).	1706	to pass C<$handle> as first argument as all other callbacks do that,
		1707	although there is no strict requirement on this).
1230		1708
1231	Note that this is a function, and all types registered this way will be
1232	global, so try to use unique names.
1233
1234	For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>,	1709	For examples, see the source of this module (F<perldoc -m
1235	search for C<register_read_type>)).	1710	AnyEvent::Handle>, search for C<register_read_type>)).
1236		1711
1237	=item $handle->stop_read	1712	=item $handle->stop_read
1238		1713
1239	=item $handle->start_read	1714	=item $handle->start_read
1240		1715
…		…
1246	Note that AnyEvent::Handle will automatically C<start_read> for you when	1721	Note that AnyEvent::Handle will automatically C<start_read> for you when
1247	you change the C<on_read> callback or push/unshift a read callback, and it	1722	you change the C<on_read> callback or push/unshift a read callback, and it
1248	will automatically C<stop_read> for you when neither C<on_read> is set nor	1723	will automatically C<stop_read> for you when neither C<on_read> is set nor
1249	there are any read requests in the queue.	1724	there are any read requests in the queue.
1250		1725
		1726	These methods will have no effect when in TLS mode (as TLS doesn't support
		1727	half-duplex connections).
		1728
1251	=cut	1729	=cut
1252		1730
1253	sub stop_read {	1731	sub stop_read {
1254	my ($self) = @_;	1732	my ($self) = @_;
1255		1733
1256	delete $self->{_rw};	1734	delete $self->{_rw} unless $self->{tls};
1257	}	1735	}
1258		1736
1259	sub start_read {	1737	sub start_read {
1260	my ($self) = @_;	1738	my ($self) = @_;
1261		1739
1262	unless ($self->{_rw} || $self->{_eof}) {	1740	unless ($self->{_rw} || $self->{_eof} || !$self->{fh}) {
1263	Scalar::Util::weaken $self;	1741	Scalar::Util::weaken $self;
1264		1742
1265	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1743	$self->{_rw} = AE::io $self->{fh}, 0, sub {
1266	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1744	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1267	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;	1745	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;
1268		1746
1269	if ($len > 0) {	1747	if ($len > 0) {
1270	$self->{_activity} = AnyEvent->now;	1748	$self->{_activity} = $self->{_ractivity} = AE::now;
1271		1749
1272	$self->{filter_r}	1750	if ($self->{tls}) {
1273	? $self->{filter_r}($self, $rbuf)	1751	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1274	: $self->{_in_drain} || $self->_drain_rbuf;	1752
		1753	&_dotls ($self);
		1754	} else {
		1755	$self->_drain_rbuf;
		1756	}
1275		1757
1276	} elsif (defined $len) {	1758	} elsif (defined $len) {
1277	delete $self->{_rw};	1759	delete $self->{_rw};
1278	$self->{_eof} = 1;	1760	$self->{_eof} = 1;
1279	$self->_drain_rbuf unless $self->{_in_drain};	1761	$self->_drain_rbuf;
1280		1762
1281	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	1763	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
1282	return $self->_error ($!, 1);	1764	return $self->_error ($!, 1);
1283	}	1765	}
1284	});	1766	};
1285	}	1767	}
1286	}	1768	}
1287		1769
		1770	our $ERROR_SYSCALL;
		1771	our $ERROR_WANT_READ;
		1772
		1773	sub _tls_error {
		1774	my ($self, $err) = @_;
		1775
		1776	return $self->_error ($!, 1)
		1777	if $err == Net::SSLeay::ERROR_SYSCALL ();
		1778
		1779	my $err =Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ());
		1780
		1781	# reduce error string to look less scary
		1782	$err =~ s/^error:[0-9a-fA-F]{8}:[^:]+:([^:]+):/\L$1: /;
		1783
		1784	if ($self->{_on_starttls}) {
		1785	(delete $self->{_on_starttls})->($self, undef, $err);
		1786	&_freetls;
		1787	} else {
		1788	&_freetls;
		1789	$self->_error (Errno::EPROTO, 1, $err);
		1790	}
		1791	}
		1792
		1793	# poll the write BIO and send the data if applicable
		1794	# also decode read data if possible
		1795	# this is basiclaly our TLS state machine
		1796	# more efficient implementations are possible with openssl,
		1797	# but not with the buggy and incomplete Net::SSLeay.
1288	sub _dotls {	1798	sub _dotls {
1289	my ($self) = @_;	1799	my ($self) = @_;
1290		1800
1291	my $buf;	1801	my $tmp;
1292		1802
1293	if (length $self->{_tls_wbuf}) {	1803	if (length $self->{_tls_wbuf}) {
1294	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1804	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1295	substr $self->{_tls_wbuf}, 0, $len, "";	1805	substr $self->{_tls_wbuf}, 0, $tmp, "";
1296	}	1806	}
1297	}
1298		1807
		1808	$tmp = Net::SSLeay::get_error ($self->{tls}, $tmp);
		1809	return $self->_tls_error ($tmp)
		1810	if $tmp != $ERROR_WANT_READ
		1811	&& ($tmp != $ERROR_SYSCALL || $!);
		1812	}
		1813
		1814	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
		1815	unless (length $tmp) {
		1816	$self->{_on_starttls}
		1817	and (delete $self->{_on_starttls})->($self, undef, "EOF during handshake"); # ???
		1818	&_freetls;
		1819
		1820	if ($self->{on_stoptls}) {
		1821	$self->{on_stoptls}($self);
		1822	return;
		1823	} else {
		1824	# let's treat SSL-eof as we treat normal EOF
		1825	delete $self->{_rw};
		1826	$self->{_eof} = 1;
		1827	}
		1828	}
		1829
		1830	$self->{_tls_rbuf} .= $tmp;
		1831	$self->_drain_rbuf;
		1832	$self->{tls} or return; # tls session might have gone away in callback
		1833	}
		1834
		1835	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
		1836	return $self->_tls_error ($tmp)
		1837	if $tmp != $ERROR_WANT_READ
		1838	&& ($tmp != $ERROR_SYSCALL || $!);
		1839
1299	if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {	1840	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1300	$self->{wbuf} .= $buf;	1841	$self->{wbuf} .= $tmp;
1301	$self->_drain_wbuf;	1842	$self->_drain_wbuf;
		1843	$self->{tls} or return; # tls session might have gone away in callback
1302	}	1844	}
1303		1845
1304	while (defined ($buf = Net::SSLeay::read ($self->{tls}))) {	1846	$self->{_on_starttls}
1305	if (length $buf) {	1847	and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK ()
1306	$self->{rbuf} .= $buf;	1848	and (delete $self->{_on_starttls})->($self, 1, "TLS/SSL connection established");
1307	$self->_drain_rbuf unless $self->{_in_drain};
1308	} else {
1309	# let's treat SSL-eof as we treat normal EOF
1310	$self->{_eof} = 1;
1311	$self->_shutdown;
1312	return;
1313	}
1314	}
1315
1316	my $err = Net::SSLeay::get_error ($self->{tls}, -1);
1317
1318	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {
1319	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {
1320	return $self->_error ($!, 1);
1321	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {
1322	return $self->_error (&Errno::EIO, 1);
1323	}
1324
1325	# all others are fine for our purposes
1326	}
1327	}	1849	}
1328		1850
1329	=item $handle->starttls ($tls[, $tls_ctx])	1851	=item $handle->starttls ($tls[, $tls_ctx])
1330		1852
1331	Instead of starting TLS negotiation immediately when the AnyEvent::Handle	1853	Instead of starting TLS negotiation immediately when the AnyEvent::Handle
1332	object is created, you can also do that at a later time by calling	1854	object is created, you can also do that at a later time by calling
1333	C<starttls>.	1855	C<starttls>.
1334		1856
		1857	Starting TLS is currently an asynchronous operation - when you push some
		1858	write data and then call C<< ->starttls >> then TLS negotiation will start
		1859	immediately, after which the queued write data is then sent.
		1860
1335	The first argument is the same as the C<tls> constructor argument (either	1861	The first argument is the same as the C<tls> constructor argument (either
1336	C<"connect">, C<"accept"> or an existing Net::SSLeay object).	1862	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
1337		1863
1338	The second argument is the optional C<Net::SSLeay::CTX> object that is	1864	The second argument is the optional C<AnyEvent::TLS> object that is used
1339	used when AnyEvent::Handle has to create its own TLS connection object.	1865	when AnyEvent::Handle has to create its own TLS connection object, or
		1866	a hash reference with C<< key => value >> pairs that will be used to
		1867	construct a new context.
1340		1868
1341	The TLS connection object will end up in C<< $handle->{tls} >> after this	1869	The TLS connection object will end up in C<< $handle->{tls} >>, the TLS
1342	call and can be used or changed to your liking. Note that the handshake	1870	context in C<< $handle->{tls_ctx} >> after this call and can be used or
1343	might have already started when this function returns.	1871	changed to your liking. Note that the handshake might have already started
		1872	when this function returns.
1344		1873
		1874	Due to bugs in OpenSSL, it might or might not be possible to do multiple
		1875	handshakes on the same stream. Best do not attempt to use the stream after
		1876	stopping TLS.
		1877
		1878	This method may invoke callbacks (and therefore the handle might be
		1879	destroyed after it returns).
		1880
1345	=cut	1881	=cut
		1882
		1883	our %TLS_CACHE; #TODO not yet documented, should we?
1346		1884
1347	sub starttls {	1885	sub starttls {
1348	my ($self, $ssl, $ctx) = @_;	1886	my ($self, $tls, $ctx) = @_;
1349		1887
1350	$self->stoptls;	1888	Carp::croak "It is an error to call starttls on an AnyEvent::Handle object while TLS is already active, caught"
		1889	if $self->{tls};
1351		1890
1352	if ($ssl eq "accept") {	1891	$self->{tls} = $tls;
1353	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());	1892	$self->{tls_ctx} = $ctx if @_ > 2;
1354	Net::SSLeay::set_accept_state ($ssl);	1893
1355	} elsif ($ssl eq "connect") {	1894	return unless $self->{fh};
1356	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());	1895
1357	Net::SSLeay::set_connect_state ($ssl);	1896	require Net::SSLeay;
		1897
		1898	$ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL ();
		1899	$ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ ();
		1900
		1901	$tls = delete $self->{tls};
		1902	$ctx = $self->{tls_ctx};
		1903
		1904	local $Carp::CarpLevel = 1; # skip ourselves when creating a new context or session
		1905
		1906	if ("HASH" eq ref $ctx) {
		1907	require AnyEvent::TLS;
		1908
		1909	if ($ctx->{cache}) {
		1910	my $key = $ctx+0;
		1911	$ctx = $TLS_CACHE{$key} ||= new AnyEvent::TLS %$ctx;
		1912	} else {
		1913	$ctx = new AnyEvent::TLS %$ctx;
		1914	}
		1915	}
1358	}	1916
1359		1917	$self->{tls_ctx} = $ctx || TLS_CTX ();
1360	$self->{tls} = $ssl;	1918	$self->{tls} = $tls = $self->{tls_ctx}->_get_session ($tls, $self, $self->{peername});
1361		1919
1362	# basically, this is deep magic (because SSL_read should have the same issues)	1920	# basically, this is deep magic (because SSL_read should have the same issues)
1363	# but the openssl maintainers basically said: "trust us, it just works".	1921	# but the openssl maintainers basically said: "trust us, it just works".
1364	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1922	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1365	# and mismaintained ssleay-module doesn't even offer them).	1923	# and mismaintained ssleay-module doesn't even offer them).
1366	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html	1924	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
		1925	#
		1926	# in short: this is a mess.
		1927	#
		1928	# note that we do not try to keep the length constant between writes as we are required to do.
		1929	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
		1930	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
		1931	# have identity issues in that area.
1367	Net::SSLeay::CTX_set_mode ($self->{tls},	1932	# Net::SSLeay::CTX_set_mode ($ssl,
1368	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)	1933	# (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)
1369	| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));	1934	# | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));
		1935	Net::SSLeay::CTX_set_mode ($tls, 1|2);
1370		1936
1371	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1937	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1372	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1938	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1373		1939
		1940	Net::SSLeay::BIO_write ($self->{_rbio}, delete $self->{rbuf});
		1941
1374	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	1942	Net::SSLeay::set_bio ($tls, $self->{_rbio}, $self->{_wbio});
1375		1943
1376	$self->{filter_w} = sub {	1944	$self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) }
1377	$_[0]{_tls_wbuf} .= ${$_[1]};	1945	if $self->{on_starttls};
1378	&_dotls;	1946
1379	};	1947	&_dotls; # need to trigger the initial handshake
1380	$self->{filter_r} = sub {	1948	$self->start_read; # make sure we actually do read
1381	Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]});
1382	&_dotls;
1383	};
1384	}	1949	}
1385		1950
1386	=item $handle->stoptls	1951	=item $handle->stoptls
1387		1952
1388	Destroys the SSL connection, if any. Partial read or write data will be	1953	Shuts down the SSL connection - this makes a proper EOF handshake by
1389	lost.	1954	sending a close notify to the other side, but since OpenSSL doesn't
		1955	support non-blocking shut downs, it is not guaranteed that you can re-use
		1956	the stream afterwards.
		1957
		1958	This method may invoke callbacks (and therefore the handle might be
		1959	destroyed after it returns).
1390		1960
1391	=cut	1961	=cut
1392		1962
1393	sub stoptls {	1963	sub stoptls {
1394	my ($self) = @_;	1964	my ($self) = @_;
1395		1965
1396	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};	1966	if ($self->{tls} && $self->{fh}) {
		1967	Net::SSLeay::shutdown ($self->{tls});
1397		1968
1398	delete $self->{_rbio};	1969	&_dotls;
1399	delete $self->{_wbio};	1970
1400	delete $self->{_tls_wbuf};	1971	# # we don't give a shit. no, we do, but we can't. no...#d#
1401	delete $self->{filter_r};	1972	# # we, we... have to use openssl :/#d#
1402	delete $self->{filter_w};	1973	# &_freetls;#d#
		1974	}
		1975	}
		1976
		1977	sub _freetls {
		1978	my ($self) = @_;
		1979
		1980	return unless $self->{tls};
		1981
		1982	$self->{tls_ctx}->_put_session (delete $self->{tls})
		1983	if $self->{tls} > 0;
		1984
		1985	delete @$self{qw(_rbio _wbio _tls_wbuf _on_starttls)};
1403	}	1986	}
1404		1987
1405	sub DESTROY {	1988	sub DESTROY {
1406	my $self = shift;	1989	my ($self) = @_;
1407		1990
1408	$self->stoptls;	1991	&_freetls;
1409		1992
1410	my $linger = exists $self->{linger} ? $self->{linger} : 3600;	1993	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
1411		1994
1412	if ($linger && length $self->{wbuf}) {	1995	if ($linger && length $self->{wbuf} && $self->{fh}) {
1413	my $fh = delete $self->{fh};	1996	my $fh = delete $self->{fh};
1414	my $wbuf = delete $self->{wbuf};	1997	my $wbuf = delete $self->{wbuf};
1415		1998
1416	my @linger;	1999	my @linger;
1417		2000
1418	push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub {	2001	push @linger, AE::io $fh, 1, sub {
1419	my $len = syswrite $fh, $wbuf, length $wbuf;	2002	my $len = syswrite $fh, $wbuf, length $wbuf;
1420		2003
1421	if ($len > 0) {	2004	if ($len > 0) {
1422	substr $wbuf, 0, $len, "";	2005	substr $wbuf, 0, $len, "";
1423	} else {	2006	} else {
1424	@linger = (); # end	2007	@linger = (); # end
1425	}	2008	}
1426	});	2009	};
1427	push @linger, AnyEvent->timer (after => $linger, cb => sub {	2010	push @linger, AE::timer $linger, 0, sub {
1428	@linger = ();	2011	@linger = ();
1429	});	2012	};
1430	}	2013	}
1431	}	2014	}
		2015
		2016	=item $handle->destroy
		2017
		2018	Shuts down the handle object as much as possible - this call ensures that
		2019	no further callbacks will be invoked and as many resources as possible
		2020	will be freed. Any method you will call on the handle object after
		2021	destroying it in this way will be silently ignored (and it will return the
		2022	empty list).
		2023
		2024	Normally, you can just "forget" any references to an AnyEvent::Handle
		2025	object and it will simply shut down. This works in fatal error and EOF
		2026	callbacks, as well as code outside. It does I<NOT> work in a read or write
		2027	callback, so when you want to destroy the AnyEvent::Handle object from
		2028	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
		2029	that case.
		2030
		2031	Destroying the handle object in this way has the advantage that callbacks
		2032	will be removed as well, so if those are the only reference holders (as
		2033	is common), then one doesn't need to do anything special to break any
		2034	reference cycles.
		2035
		2036	The handle might still linger in the background and write out remaining
		2037	data, as specified by the C<linger> option, however.
		2038
		2039	=cut
		2040
		2041	sub destroy {
		2042	my ($self) = @_;
		2043
		2044	$self->DESTROY;
		2045	%$self = ();
		2046	bless $self, "AnyEvent::Handle::destroyed";
		2047	}
		2048
		2049	sub AnyEvent::Handle::destroyed::AUTOLOAD {
		2050	#nop
		2051	}
		2052
		2053	=item $handle->destroyed
		2054
		2055	Returns false as long as the handle hasn't been destroyed by a call to C<<
		2056	->destroy >>, true otherwise.
		2057
		2058	Can be useful to decide whether the handle is still valid after some
		2059	callback possibly destroyed the handle. For example, C<< ->push_write >>,
		2060	C<< ->starttls >> and other methods can call user callbacks, which in turn
		2061	can destroy the handle, so work can be avoided by checking sometimes:
		2062
		2063	$hdl->starttls ("accept");
		2064	return if $hdl->destroyed;
		2065	$hdl->push_write (...
		2066
		2067	Note that the call to C<push_write> will silently be ignored if the handle
		2068	has been destroyed, so often you can just ignore the possibility of the
		2069	handle being destroyed.
		2070
		2071	=cut
		2072
		2073	sub destroyed { 0 }
		2074	sub AnyEvent::Handle::destroyed::destroyed { 1 }
1432		2075
1433	=item AnyEvent::Handle::TLS_CTX	2076	=item AnyEvent::Handle::TLS_CTX
1434		2077
1435	This function creates and returns the Net::SSLeay::CTX object used by	2078	This function creates and returns the AnyEvent::TLS object used by default
1436	default for TLS mode.	2079	for TLS mode.
1437		2080
1438	The context is created like this:	2081	The context is created by calling L<AnyEvent::TLS> without any arguments.
1439
1440	Net::SSLeay::load_error_strings;
1441	Net::SSLeay::SSLeay_add_ssl_algorithms;
1442	Net::SSLeay::randomize;
1443
1444	my $CTX = Net::SSLeay::CTX_new;
1445
1446	Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL
1447		2082
1448	=cut	2083	=cut
1449		2084
1450	our $TLS_CTX;	2085	our $TLS_CTX;
1451		2086
1452	sub TLS_CTX() {	2087	sub TLS_CTX() {
1453	$TLS_CTX || do {	2088	$TLS_CTX ||= do {
1454	require Net::SSLeay;	2089	require AnyEvent::TLS;
1455		2090
1456	Net::SSLeay::load_error_strings ();	2091	new AnyEvent::TLS
1457	Net::SSLeay::SSLeay_add_ssl_algorithms ();
1458	Net::SSLeay::randomize ();
1459
1460	$TLS_CTX = Net::SSLeay::CTX_new ();
1461
1462	Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ());
1463
1464	$TLS_CTX
1465	}	2092	}
1466	}	2093	}
1467		2094
1468	=back	2095	=back
		2096
		2097
		2098	=head1 NONFREQUENTLY ASKED QUESTIONS
		2099
		2100	=over 4
		2101
		2102	=item I C<undef> the AnyEvent::Handle reference inside my callback and
		2103	still get further invocations!
		2104
		2105	That's because AnyEvent::Handle keeps a reference to itself when handling
		2106	read or write callbacks.
		2107
		2108	It is only safe to "forget" the reference inside EOF or error callbacks,
		2109	from within all other callbacks, you need to explicitly call the C<<
		2110	->destroy >> method.
		2111
		2112	=item I get different callback invocations in TLS mode/Why can't I pause
		2113	reading?
		2114
		2115	Unlike, say, TCP, TLS connections do not consist of two independent
		2116	communication channels, one for each direction. Or put differently. The
		2117	read and write directions are not independent of each other: you cannot
		2118	write data unless you are also prepared to read, and vice versa.
		2119
		2120	This can mean than, in TLS mode, you might get C<on_error> or C<on_eof>
		2121	callback invocations when you are not expecting any read data - the reason
		2122	is that AnyEvent::Handle always reads in TLS mode.
		2123
		2124	During the connection, you have to make sure that you always have a
		2125	non-empty read-queue, or an C<on_read> watcher. At the end of the
		2126	connection (or when you no longer want to use it) you can call the
		2127	C<destroy> method.
		2128
		2129	=item How do I read data until the other side closes the connection?
		2130
		2131	If you just want to read your data into a perl scalar, the easiest way
		2132	to achieve this is by setting an C<on_read> callback that does nothing,
		2133	clearing the C<on_eof> callback and in the C<on_error> callback, the data
		2134	will be in C<$_[0]{rbuf}>:
		2135
		2136	$handle->on_read (sub { });
		2137	$handle->on_eof (undef);
		2138	$handle->on_error (sub {
		2139	my $data = delete $_[0]{rbuf};
		2140	});
		2141
		2142	The reason to use C<on_error> is that TCP connections, due to latencies
		2143	and packets loss, might get closed quite violently with an error, when in
		2144	fact, all data has been received.
		2145
		2146	It is usually better to use acknowledgements when transferring data,
		2147	to make sure the other side hasn't just died and you got the data
		2148	intact. This is also one reason why so many internet protocols have an
		2149	explicit QUIT command.
		2150
		2151	=item I don't want to destroy the handle too early - how do I wait until
		2152	all data has been written?
		2153
		2154	After writing your last bits of data, set the C<on_drain> callback
		2155	and destroy the handle in there - with the default setting of
		2156	C<low_water_mark> this will be called precisely when all data has been
		2157	written to the socket:
		2158
		2159	$handle->push_write (...);
		2160	$handle->on_drain (sub {
		2161	warn "all data submitted to the kernel\n";
		2162	undef $handle;
		2163	});
		2164
		2165	If you just want to queue some data and then signal EOF to the other side,
		2166	consider using C<< ->push_shutdown >> instead.
		2167
		2168	=item I want to contact a TLS/SSL server, I don't care about security.
		2169
		2170	If your TLS server is a pure TLS server (e.g. HTTPS) that only speaks TLS,
		2171	simply connect to it and then create the AnyEvent::Handle with the C<tls>
		2172	parameter:
		2173
		2174	tcp_connect $host, $port, sub {
		2175	my ($fh) = @_;
		2176
		2177	my $handle = new AnyEvent::Handle
		2178	fh => $fh,
		2179	tls => "connect",
		2180	on_error => sub { ... };
		2181
		2182	$handle->push_write (...);
		2183	};
		2184
		2185	=item I want to contact a TLS/SSL server, I do care about security.
		2186
		2187	Then you should additionally enable certificate verification, including
		2188	peername verification, if the protocol you use supports it (see
		2189	L<AnyEvent::TLS>, C<verify_peername>).
		2190
		2191	E.g. for HTTPS:
		2192
		2193	tcp_connect $host, $port, sub {
		2194	my ($fh) = @_;
		2195
		2196	my $handle = new AnyEvent::Handle
		2197	fh => $fh,
		2198	peername => $host,
		2199	tls => "connect",
		2200	tls_ctx => { verify => 1, verify_peername => "https" },
		2201	...
		2202
		2203	Note that you must specify the hostname you connected to (or whatever
		2204	"peername" the protocol needs) as the C<peername> argument, otherwise no
		2205	peername verification will be done.
		2206
		2207	The above will use the system-dependent default set of trusted CA
		2208	certificates. If you want to check against a specific CA, add the
		2209	C<ca_file> (or C<ca_cert>) arguments to C<tls_ctx>:
		2210
		2211	tls_ctx => {
		2212	verify => 1,
		2213	verify_peername => "https",
		2214	ca_file => "my-ca-cert.pem",
		2215	},
		2216
		2217	=item I want to create a TLS/SSL server, how do I do that?
		2218
		2219	Well, you first need to get a server certificate and key. You have
		2220	three options: a) ask a CA (buy one, use cacert.org etc.) b) create a
		2221	self-signed certificate (cheap. check the search engine of your choice,
		2222	there are many tutorials on the net) or c) make your own CA (tinyca2 is a
		2223	nice program for that purpose).
		2224
		2225	Then create a file with your private key (in PEM format, see
		2226	L<AnyEvent::TLS>), followed by the certificate (also in PEM format). The
		2227	file should then look like this:
		2228
		2229	-----BEGIN RSA PRIVATE KEY-----
		2230	...header data
		2231	... lots of base64'y-stuff
		2232	-----END RSA PRIVATE KEY-----
		2233
		2234	-----BEGIN CERTIFICATE-----
		2235	... lots of base64'y-stuff
		2236	-----END CERTIFICATE-----
		2237
		2238	The important bits are the "PRIVATE KEY" and "CERTIFICATE" parts. Then
		2239	specify this file as C<cert_file>:
		2240
		2241	tcp_server undef, $port, sub {
		2242	my ($fh) = @_;
		2243
		2244	my $handle = new AnyEvent::Handle
		2245	fh => $fh,
		2246	tls => "accept",
		2247	tls_ctx => { cert_file => "my-server-keycert.pem" },
		2248	...
		2249
		2250	When you have intermediate CA certificates that your clients might not
		2251	know about, just append them to the C<cert_file>.
		2252
		2253	=back
		2254
1469		2255
1470	=head1 SUBCLASSING AnyEvent::Handle	2256	=head1 SUBCLASSING AnyEvent::Handle
1471		2257
1472	In many cases, you might want to subclass AnyEvent::Handle.	2258	In many cases, you might want to subclass AnyEvent::Handle.
1473		2259

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