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Revision 1.132 by elmex, Thu Jul 2 22:25:13 2009 UTC vs.
Revision 1.237 by root, Tue Jul 30 23:14:32 2013 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 = 4.45;
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; $hdl = new AnyEvent::Handle
29	AnyEvent::Handle->new (
30	fh => \*STDIN,	13	fh => \*STDIN,
31	on_eof => sub {	14	on_error => sub {
		15	my ($hdl, $fatal, $msg) = @_;
		16	AE::log error => $msg;
		17	$hdl->destroy;
32	$cv->send;	18	$cv->send;
33	},
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	say "got line <$line>";
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 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, and other stream things).
52	on sockets see L<AnyEvent::Util>.
53		37
54	The L<AnyEvent::Intro> tutorial contains some well-documented	38	The L<AnyEvent::Intro> tutorial contains some well-documented
55	AnyEvent::Handle examples.	39	AnyEvent::Handle examples.
56		40
57	In the following, when the documentation refers to of "bytes" then this	41	In the following, where the documentation refers to "bytes", it means
58	means characters. As sysread and syswrite are used for all I/O, their	42	characters. As sysread and syswrite are used for all I/O, their
59	treatment of characters applies to this module as well.	43	treatment of characters applies to this module as well.
		44
		45	At the very minimum, you should specify C<fh> or C<connect>, and the
		46	C<on_error> callback.
60		47
61	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
62	argument.	49	argument.
63		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
		80	sub MAX_READ_SIZE() { 131072 }
		81
64	=head1 METHODS	82	=head1 METHODS
65		83
66	=over 4	84	=over 4
67		85
68	=item $handle = B<new> AnyEvent::TLS fh => $filehandle, key => value...	86	=item $handle = B<new> AnyEvent::Handle fh => $filehandle, key => value...
69		87
70	The constructor supports these arguments (all as C<< key => value >> pairs).	88	The constructor supports these arguments (all as C<< key => value >> pairs).
71		89
72	=over 4	90	=over 4
73		91
74	=item fh => $filehandle [MANDATORY]	92	=item fh => $filehandle [C<fh> or C<connect> MANDATORY]
75		93
76	The filehandle this L<AnyEvent::Handle> object will operate on.	94	The filehandle this L<AnyEvent::Handle> object will operate on.
77
78	NOTE: The filehandle will be set to non-blocking mode (using	95	NOTE: The filehandle will be set to non-blocking mode (using
79	C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in	96	C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in
80	that mode.	97	that mode.
81		98
		99	=item connect => [$host, $service] [C<fh> or C<connect> MANDATORY]
		100
		101	Try to connect to the specified host and service (port), using
		102	C<AnyEvent::Socket::tcp_connect>. The C<$host> additionally becomes the
		103	default C<peername>.
		104
		105	You have to specify either this parameter, or C<fh>, above.
		106
		107	It is possible to push requests on the read and write queues, and modify
		108	properties of the stream, even while AnyEvent::Handle is connecting.
		109
		110	When this parameter is specified, then the C<on_prepare>,
		111	C<on_connect_error> and C<on_connect> callbacks will be called under the
		112	appropriate circumstances:
		113
		114	=over 4
		115
		116	=item on_prepare => $cb->($handle)
		117
		118	This (rarely used) callback is called before a new connection is
		119	attempted, but after the file handle has been created (you can access that
		120	file handle via C<< $handle->{fh} >>). It could be used to prepare the
		121	file handle with parameters required for the actual connect (as opposed to
		122	settings that can be changed when the connection is already established).
		123
		124	The return value of this callback should be the connect timeout value in
		125	seconds (or C<0>, or C<undef>, or the empty list, to indicate that the
		126	default timeout is to be used).
		127
		128	=item on_connect => $cb->($handle, $host, $port, $retry->())
		129
		130	This callback is called when a connection has been successfully established.
		131
		132	The peer's numeric host and port (the socket peername) are passed as
		133	parameters, together with a retry callback. At the time it is called the
		134	read and write queues, EOF status, TLS status and similar properties of
		135	the handle will have been reset.
		136
		137	It is not allowed to use the read or write queues while the handle object
		138	is connecting.
		139
		140	If, for some reason, the handle is not acceptable, calling C<$retry> will
		141	continue with the next connection target (in case of multi-homed hosts or
		142	SRV records there can be multiple connection endpoints). The C<$retry>
		143	callback can be invoked after the connect callback returns, i.e. one can
		144	start a handshake and then decide to retry with the next host if the
		145	handshake fails.
		146
		147	In most cases, you should ignore the C<$retry> parameter.
		148
		149	=item on_connect_error => $cb->($handle, $message)
		150
		151	This callback is called when the connection could not be
		152	established. C<$!> will contain the relevant error code, and C<$message> a
		153	message describing it (usually the same as C<"$!">).
		154
		155	If this callback isn't specified, then C<on_error> will be called with a
		156	fatal error instead.
		157
		158	=back
		159
		160	=item on_error => $cb->($handle, $fatal, $message)
		161
		162	This is the error callback, which is called when, well, some error
		163	occured, such as not being able to resolve the hostname, failure to
		164	connect, or a read error.
		165
		166	Some errors are fatal (which is indicated by C<$fatal> being true). On
		167	fatal errors the handle object will be destroyed (by a call to C<< ->
		168	destroy >>) after invoking the error callback (which means you are free to
		169	examine the handle object). Examples of fatal errors are an EOF condition
		170	with active (but unsatisfiable) read watchers (C<EPIPE>) or I/O errors. In
		171	cases where the other side can close the connection at will, it is
		172	often easiest to not report C<EPIPE> errors in this callback.
		173
		174	AnyEvent::Handle tries to find an appropriate error code for you to check
		175	against, but in some cases (TLS errors), this does not work well.
		176
		177	If you report the error to the user, it is recommended to always output
		178	the C<$message> argument in human-readable error messages (you don't need
		179	to report C<"$!"> if you report C<$message>).
		180
		181	If you want to react programmatically to the error, then looking at C<$!>
		182	and comparing it against some of the documented C<Errno> values is usually
		183	better than looking at the C<$message>.
		184
		185	Non-fatal errors can be retried by returning, but it is recommended
		186	to simply ignore this parameter and instead abondon the handle object
		187	when this callback is invoked. Examples of non-fatal errors are timeouts
		188	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
		189
		190	On entry to the callback, the value of C<$!> contains the operating
		191	system error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or
		192	C<EPROTO>).
		193
		194	While not mandatory, it is I<highly> recommended to set this callback, as
		195	you will not be notified of errors otherwise. The default just calls
		196	C<croak>.
		197
		198	=item on_read => $cb->($handle)
		199
		200	This sets the default read callback, which is called when data arrives
		201	and no read request is in the queue (unlike read queue callbacks, this
		202	callback will only be called when at least one octet of data is in the
		203	read buffer).
		204
		205	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
		206	method or access the C<< $handle->{rbuf} >> member directly. Note that you
		207	must not enlarge or modify the read buffer, you can only remove data at
		208	the beginning from it.
		209
		210	You can also call C<< ->push_read (...) >> or any other function that
		211	modifies the read queue. Or do both. Or ...
		212
		213	When an EOF condition is detected, AnyEvent::Handle will first try to
		214	feed all the remaining data to the queued callbacks and C<on_read> before
		215	calling the C<on_eof> callback. If no progress can be made, then a fatal
		216	error will be raised (with C<$!> set to C<EPIPE>).
		217
		218	Note that, unlike requests in the read queue, an C<on_read> callback
		219	doesn't mean you I<require> some data: if there is an EOF and there
		220	are outstanding read requests then an error will be flagged. With an
		221	C<on_read> callback, the C<on_eof> callback will be invoked.
		222
82	=item on_eof => $cb->($handle)	223	=item on_eof => $cb->($handle)
83		224
84	Set the callback to be called when an end-of-file condition is detected,	225	Set the callback to be called when an end-of-file condition is detected,
85	i.e. in the case of a socket, when the other side has closed the	226	i.e. in the case of a socket, when the other side has closed the
86	connection cleanly.	227	connection cleanly, and there are no outstanding read requests in the
		228	queue (if there are read requests, then an EOF counts as an unexpected
		229	connection close and will be flagged as an error).
87		230
88	For sockets, this just means that the other side has stopped sending data,	231	For sockets, this just means that the other side has stopped sending data,
89	you can still try to write data, and, in fact, one can return from the EOF	232	you can still try to write data, and, in fact, one can return from the EOF
90	callback and continue writing data, as only the read part has been shut	233	callback and continue writing data, as only the read part has been shut
91	down.	234	down.
92		235
93	While not mandatory, it is I<highly> recommended to set an EOF callback,
94	otherwise you might end up with a closed socket while you are still
95	waiting for data.
96
97	If an EOF condition has been detected but no C<on_eof> callback has been	236	If an EOF condition has been detected but no C<on_eof> callback has been
98	set, then a fatal error will be raised with C<$!> set to <0>.	237	set, then a fatal error will be raised with C<$!> set to <0>.
99		238
100	=item on_error => $cb->($handle, $fatal)
101
102	This is the error callback, which is called when, well, some error
103	occured, such as not being able to resolve the hostname, failure to
104	connect or a read error.
105
106	Some errors are fatal (which is indicated by C<$fatal> being true). On
107	fatal errors the handle object will be shut down and will not be usable
108	(but you are free to look at the current C<< ->rbuf >>). Examples of fatal
109	errors are an EOF condition with active (but unsatisifable) read watchers
110	(C<EPIPE>) or I/O errors.
111
112	Non-fatal errors can be retried by simply returning, but it is recommended
113	to simply ignore this parameter and instead abondon the handle object
114	when this callback is invoked. Examples of non-fatal errors are timeouts
115	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
116
117	On callback entrance, the value of C<$!> contains the operating system
118	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).
119
120	While not mandatory, it is I<highly> recommended to set this callback, as
121	you will not be notified of errors otherwise. The default simply calls
122	C<croak>.
123
124	=item on_read => $cb->($handle)
125
126	This sets the default read callback, which is called when data arrives
127	and no read request is in the queue (unlike read queue callbacks, this
128	callback will only be called when at least one octet of data is in the
129	read buffer).
130
131	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
132	method or access the C<$handle->{rbuf}> member directly. Note that you
133	must not enlarge or modify the read buffer, you can only remove data at
134	the beginning from it.
135
136	When an EOF condition is detected then AnyEvent::Handle will first try to
137	feed all the remaining data to the queued callbacks and C<on_read> before
138	calling the C<on_eof> callback. If no progress can be made, then a fatal
139	error will be raised (with C<$!> set to C<EPIPE>).
140
141	=item on_drain => $cb->($handle)	239	=item on_drain => $cb->($handle)
142		240
143	This sets the callback that is called when the write buffer becomes empty	241	This sets the callback that is called once when the write buffer becomes
144	(or when the callback is set and the buffer is empty already).	242	empty (and immediately when the handle object is created).
145		243
146	To append to the write buffer, use the C<< ->push_write >> method.	244	To append to the write buffer, use the C<< ->push_write >> method.
147		245
148	This callback is useful when you don't want to put all of your write data	246	This callback is useful when you don't want to put all of your write data
149	into the queue at once, for example, when you want to write the contents	247	into the queue at once, for example, when you want to write the contents
…		…
151	memory and push it into the queue, but instead only read more data from	249	memory and push it into the queue, but instead only read more data from
152	the file when the write queue becomes empty.	250	the file when the write queue becomes empty.
153		251
154	=item timeout => $fractional_seconds	252	=item timeout => $fractional_seconds
155		253
		254	=item rtimeout => $fractional_seconds
		255
		256	=item wtimeout => $fractional_seconds
		257
156	If non-zero, then this enables an "inactivity" timeout: whenever this many	258	If non-zero, then these enables an "inactivity" timeout: whenever this
157	seconds pass without a successful read or write on the underlying file	259	many seconds pass without a successful read or write on the underlying
158	handle, the C<on_timeout> callback will be invoked (and if that one is	260	file handle (or a call to C<timeout_reset>), the C<on_timeout> callback
159	missing, a non-fatal C<ETIMEDOUT> error will be raised).	261	will be invoked (and if that one is missing, a non-fatal C<ETIMEDOUT>
		262	error will be raised).
160		263
		264	There are three variants of the timeouts that work independently of each
		265	other, for both read and write (triggered when nothing was read I<OR>
		266	written), just read (triggered when nothing was read), and just write:
		267	C<timeout>, C<rtimeout> and C<wtimeout>, with corresponding callbacks
		268	C<on_timeout>, C<on_rtimeout> and C<on_wtimeout>, and reset functions
		269	C<timeout_reset>, C<rtimeout_reset>, and C<wtimeout_reset>.
		270
161	Note that timeout processing is also active when you currently do not have	271	Note that timeout processing is active even when you do not have any
162	any outstanding read or write requests: If you plan to keep the connection	272	outstanding read or write requests: If you plan to keep the connection
163	idle then you should disable the timout temporarily or ignore the timeout	273	idle then you should disable the timeout temporarily or ignore the
164	in the C<on_timeout> callback, in which case AnyEvent::Handle will simply	274	timeout in the corresponding C<on_timeout> callback, in which case
165	restart the timeout.	275	AnyEvent::Handle will simply restart the timeout.
166		276
167	Zero (the default) disables this timeout.	277	Zero (the default) disables the corresponding timeout.
168		278
169	=item on_timeout => $cb->($handle)	279	=item on_timeout => $cb->($handle)
		280
		281	=item on_rtimeout => $cb->($handle)
		282
		283	=item on_wtimeout => $cb->($handle)
170		284
171	Called whenever the inactivity timeout passes. If you return from this	285	Called whenever the inactivity timeout passes. If you return from this
172	callback, then the timeout will be reset as if some activity had happened,	286	callback, then the timeout will be reset as if some activity had happened,
173	so this condition is not fatal in any way.	287	so this condition is not fatal in any way.
174		288
…		…
182	be configured to accept only so-and-so much data that it cannot act on	296	be configured to accept only so-and-so much data that it cannot act on
183	(for example, when expecting a line, an attacker could send an unlimited	297	(for example, when expecting a line, an attacker could send an unlimited
184	amount of data without a callback ever being called as long as the line	298	amount of data without a callback ever being called as long as the line
185	isn't finished).	299	isn't finished).
186		300
		301	=item wbuf_max => <bytes>
		302
		303	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)
		304	when the write buffer ever (strictly) exceeds this size. This is useful to
		305	avoid some forms of denial-of-service attacks.
		306
		307	Although the units of this parameter is bytes, this is the I<raw> number
		308	of bytes not yet accepted by the kernel. This can make a difference when
		309	you e.g. use TLS, as TLS typically makes your write data larger (but it
		310	can also make it smaller due to compression).
		311
		312	As an example of when this limit is useful, take a chat server that sends
		313	chat messages to a client. If the client does not read those in a timely
		314	manner then the send buffer in the server would grow unbounded.
		315
187	=item autocork => <boolean>	316	=item autocork => <boolean>
188		317
189	When disabled (the default), then C<push_write> will try to immediately	318	When disabled (the default), C<push_write> will try to immediately
190	write the data to the handle, if possible. This avoids having to register	319	write the data to the handle if possible. This avoids having to register
191	a write watcher and wait for the next event loop iteration, but can	320	a write watcher and wait for the next event loop iteration, but can
192	be inefficient if you write multiple small chunks (on the wire, this	321	be inefficient if you write multiple small chunks (on the wire, this
193	disadvantage is usually avoided by your kernel's nagle algorithm, see	322	disadvantage is usually avoided by your kernel's nagle algorithm, see
194	C<no_delay>, but this option can save costly syscalls).	323	C<no_delay>, but this option can save costly syscalls).
195		324
196	When enabled, then writes will always be queued till the next event loop	325	When enabled, writes will always be queued till the next event loop
197	iteration. This is efficient when you do many small writes per iteration,	326	iteration. This is efficient when you do many small writes per iteration,
198	but less efficient when you do a single write only per iteration (or when	327	but less efficient when you do a single write only per iteration (or when
199	the write buffer often is full). It also increases write latency.	328	the write buffer often is full). It also increases write latency.
200		329
201	=item no_delay => <boolean>	330	=item no_delay => <boolean>
…		…
205	the Nagle algorithm, and usually it is beneficial.	334	the Nagle algorithm, and usually it is beneficial.
206		335
207	In some situations you want as low a delay as possible, which can be	336	In some situations you want as low a delay as possible, which can be
208	accomplishd by setting this option to a true value.	337	accomplishd by setting this option to a true value.
209		338
210	The default is your opertaing system's default behaviour (most likely	339	The default is your operating system's default behaviour (most likely
211	enabled), this option explicitly enables or disables it, if possible.	340	enabled). This option explicitly enables or disables it, if possible.
		341
		342	=item keepalive => <boolean>
		343
		344	Enables (default disable) the SO_KEEPALIVE option on the stream socket:
		345	normally, TCP connections have no time-out once established, so TCP
		346	connections, once established, can stay alive forever even when the other
		347	side has long gone. TCP keepalives are a cheap way to take down long-lived
		348	TCP connections when the other side becomes unreachable. While the default
		349	is OS-dependent, TCP keepalives usually kick in after around two hours,
		350	and, if the other side doesn't reply, take down the TCP connection some 10
		351	to 15 minutes later.
		352
		353	It is harmless to specify this option for file handles that do not support
		354	keepalives, and enabling it on connections that are potentially long-lived
		355	is usually a good idea.
		356
		357	=item oobinline => <boolean>
		358
		359	BSD majorly fucked up the implementation of TCP urgent data. The result
		360	is that almost no OS implements TCP according to the specs, and every OS
		361	implements it slightly differently.
		362
		363	If you want to handle TCP urgent data, then setting this flag (the default
		364	is enabled) gives you the most portable way of getting urgent data, by
		365	putting it into the stream.
		366
		367	Since BSD emulation of OOB data on top of TCP's urgent data can have
		368	security implications, AnyEvent::Handle sets this flag automatically
		369	unless explicitly specified. Note that setting this flag after
		370	establishing a connection I<may> be a bit too late (data loss could
		371	already have occured on BSD systems), but at least it will protect you
		372	from most attacks.
212		373
213	=item read_size => <bytes>	374	=item read_size => <bytes>
214		375
215	The default read block size (the amount of bytes this module will	376	The initial read block size, the number of bytes this module will try
216	try to read during each loop iteration, which affects memory	377	to read during each loop iteration. Each handle object will consume
217	requirements). Default: C<8192>.	378	at least this amount of memory for the read buffer as well, so when
		379	handling many connections watch out for memory requirements). See also
		380	C<max_read_size>. Default: C<2048>.
		381
		382	=item max_read_size => <bytes>
		383
		384	The maximum read buffer size used by the dynamic adjustment
		385	algorithm: Each time AnyEvent::Handle can read C<read_size> bytes in
		386	one go it will double C<read_size> up to the maximum given by this
		387	option. Default: C<131072> or C<read_size>, whichever is higher.
218		388
219	=item low_water_mark => <bytes>	389	=item low_water_mark => <bytes>
220		390
221	Sets the amount of bytes (default: C<0>) that make up an "empty" write	391	Sets the number of bytes (default: C<0>) that make up an "empty" write
222	buffer: If the write reaches this size or gets even samller it is	392	buffer: If the buffer reaches this size or gets even samller it is
223	considered empty.	393	considered empty.
224		394
225	Sometimes it can be beneficial (for performance reasons) to add data to	395	Sometimes it can be beneficial (for performance reasons) to add data to
226	the write buffer before it is fully drained, but this is a rare case, as	396	the write buffer before it is fully drained, but this is a rare case, as
227	the operating system kernel usually buffers data as well, so the default	397	the operating system kernel usually buffers data as well, so the default
228	is good in almost all cases.	398	is good in almost all cases.
229		399
230	=item linger => <seconds>	400	=item linger => <seconds>
231		401
232	If non-zero (default: C<3600>), then the destructor of the	402	If this is non-zero (default: C<3600>), the destructor of the
233	AnyEvent::Handle object will check whether there is still outstanding	403	AnyEvent::Handle object will check whether there is still outstanding
234	write data and will install a watcher that will write this data to the	404	write data and will install a watcher that will write this data to the
235	socket. No errors will be reported (this mostly matches how the operating	405	socket. No errors will be reported (this mostly matches how the operating
236	system treats outstanding data at socket close time).	406	system treats outstanding data at socket close time).
237		407
238	This will not work for partial TLS data that could not be encoded	408	This will not work for partial TLS data that could not be encoded
239	yet. This data will be lost. Calling the C<stoptls> method in time might	409	yet. This data will be lost. Calling the C<stoptls> method in time might
240	help.	410	help.
241		411
242	=item common_name => $string	412	=item peername => $string
243		413
244	The common name used by some verification methods (most notably SSL/TLS)	414	A string used to identify the remote site - usually the DNS hostname
245	associated with this connection. Usually this is the remote hostname used	415	(I<not> IDN!) used to create the connection, rarely the IP address.
246	to connect, but can be almost anything.	416
		417	Apart from being useful in error messages, this string is also used in TLS
		418	peername verification (see C<verify_peername> in L<AnyEvent::TLS>). This
		419	verification will be skipped when C<peername> is not specified or is
		420	C<undef>.
247		421
248	=item tls => "accept" | "connect" | Net::SSLeay::SSL object	422	=item tls => "accept" | "connect" | Net::SSLeay::SSL object
249		423
250	When this parameter is given, it enables TLS (SSL) mode, that means	424	When this parameter is given, it enables TLS (SSL) mode, that means
251	AnyEvent will start a TLS handshake as soon as the conenction has been	425	AnyEvent will start a TLS handshake as soon as the connection has been
252	established and will transparently encrypt/decrypt data afterwards.	426	established and will transparently encrypt/decrypt data afterwards.
		427
		428	All TLS protocol errors will be signalled as C<EPROTO>, with an
		429	appropriate error message.
253		430
254	TLS mode requires Net::SSLeay to be installed (it will be loaded	431	TLS mode requires Net::SSLeay to be installed (it will be loaded
255	automatically when you try to create a TLS handle): this module doesn't	432	automatically when you try to create a TLS handle): this module doesn't
256	have a dependency on that module, so if your module requires it, you have	433	have a dependency on that module, so if your module requires it, you have
257	to add the dependency yourself.	434	to add the dependency yourself. If Net::SSLeay cannot be loaded or is too
		435	old, you get an C<EPROTO> error.
258		436
259	Unlike TCP, TLS has a server and client side: for the TLS server side, use	437	Unlike TCP, TLS has a server and client side: for the TLS server side, use
260	C<accept>, and for the TLS client side of a connection, use C<connect>	438	C<accept>, and for the TLS client side of a connection, use C<connect>
261	mode.	439	mode.
262		440
…		…
273	B<IMPORTANT:> since Net::SSLeay "objects" are really only integers,	451	B<IMPORTANT:> since Net::SSLeay "objects" are really only integers,
274	passing in the wrong integer will lead to certain crash. This most often	452	passing in the wrong integer will lead to certain crash. This most often
275	happens when one uses a stylish C<< tls => 1 >> and is surprised about the	453	happens when one uses a stylish C<< tls => 1 >> and is surprised about the
276	segmentation fault.	454	segmentation fault.
277		455
278	See the C<< ->starttls >> method for when need to start TLS negotiation later.	456	Use the C<< ->starttls >> method if you need to start TLS negotiation later.
279		457
280	=item tls_ctx => $anyevent_tls	458	=item tls_ctx => $anyevent_tls
281		459
282	Use the given C<AnyEvent::TLS> object to create the new TLS connection	460	Use the given C<AnyEvent::TLS> object to create the new TLS connection
283	(unless a connection object was specified directly). If this parameter is	461	(unless a connection object was specified directly). If this
284	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	462	parameter is missing (or C<undef>), then AnyEvent::Handle will use
		463	C<AnyEvent::Handle::TLS_CTX>.
285		464
286	Instead of an object, you can also specify a hash reference with C<< key	465	Instead of an object, you can also specify a hash reference with C<< key
287	=> value >> pairs. Those will be passed to L<AnyEvent::TLS> to create a	466	=> value >> pairs. Those will be passed to L<AnyEvent::TLS> to create a
288	new TLS context object.	467	new TLS context object.
289		468
		469	=item on_starttls => $cb->($handle, $success[, $error_message])
		470
		471	This callback will be invoked when the TLS/SSL handshake has finished. If
		472	C<$success> is true, then the TLS handshake succeeded, otherwise it failed
		473	(C<on_stoptls> will not be called in this case).
		474
		475	The session in C<< $handle->{tls} >> can still be examined in this
		476	callback, even when the handshake was not successful.
		477
		478	TLS handshake failures will not cause C<on_error> to be invoked when this
		479	callback is in effect, instead, the error message will be passed to C<on_starttls>.
		480
		481	Without this callback, handshake failures lead to C<on_error> being
		482	called as usual.
		483
		484	Note that you cannot just call C<starttls> again in this callback. If you
		485	need to do that, start an zero-second timer instead whose callback can
		486	then call C<< ->starttls >> again.
		487
		488	=item on_stoptls => $cb->($handle)
		489
		490	When a SSLv3/TLS shutdown/close notify/EOF is detected and this callback is
		491	set, then it will be invoked after freeing the TLS session. If it is not,
		492	then a TLS shutdown condition will be treated like a normal EOF condition
		493	on the handle.
		494
		495	The session in C<< $handle->{tls} >> can still be examined in this
		496	callback.
		497
		498	This callback will only be called on TLS shutdowns, not when the
		499	underlying handle signals EOF.
		500
290	=item json => JSON or JSON::XS object	501	=item json => JSON or JSON::XS object
291		502
292	This is the json coder object used by the C<json> read and write types.	503	This is the json coder object used by the C<json> read and write types.
293		504
294	If you don't supply it, then AnyEvent::Handle will create and use a	505	If you don't supply it, then AnyEvent::Handle will create and use a
…		…
304		515
305	sub new {	516	sub new {
306	my $class = shift;	517	my $class = shift;
307	my $self = bless { @_ }, $class;	518	my $self = bless { @_ }, $class;
308		519
309	$self->{fh} or Carp::croak "mandatory argument fh is missing";	520	if ($self->{fh}) {
		521	$self->_start;
		522	return unless $self->{fh}; # could be gone by now
		523
		524	} elsif ($self->{connect}) {
		525	require AnyEvent::Socket;
		526
		527	$self->{peername} = $self->{connect}[0]
		528	unless exists $self->{peername};
		529
		530	$self->{_skip_drain_rbuf} = 1;
		531
		532	{
		533	Scalar::Util::weaken (my $self = $self);
		534
		535	$self->{_connect} =
		536	AnyEvent::Socket::tcp_connect (
		537	$self->{connect}[0],
		538	$self->{connect}[1],
		539	sub {
		540	my ($fh, $host, $port, $retry) = @_;
		541
		542	delete $self->{_connect}; # no longer needed
		543
		544	if ($fh) {
		545	$self->{fh} = $fh;
		546
		547	delete $self->{_skip_drain_rbuf};
		548	$self->_start;
		549
		550	$self->{on_connect}
		551	and $self->{on_connect}($self, $host, $port, sub {
		552	delete @$self{qw(fh _tw _rtw _wtw _ww _rw _eof _queue rbuf _wbuf tls _tls_rbuf _tls_wbuf)};
		553	$self->{_skip_drain_rbuf} = 1;
		554	&$retry;
		555	});
		556
		557	} else {
		558	if ($self->{on_connect_error}) {
		559	$self->{on_connect_error}($self, "$!");
		560	$self->destroy if $self;
		561	} else {
		562	$self->_error ($!, 1);
		563	}
		564	}
		565	},
		566	sub {
		567	local $self->{fh} = $_[0];
		568
		569	$self->{on_prepare}
		570	? $self->{on_prepare}->($self)
		571	: ()
		572	}
		573	);
		574	}
		575
		576	} else {
		577	Carp::croak "AnyEvent::Handle: either an existing fh or the connect parameter must be specified";
		578	}
		579
		580	$self
		581	}
		582
		583	sub _start {
		584	my ($self) = @_;
		585
		586	# too many clueless people try to use udp and similar sockets
		587	# with AnyEvent::Handle, do them a favour.
		588	my $type = getsockopt $self->{fh}, Socket::SOL_SOCKET (), Socket::SO_TYPE ();
		589	Carp::croak "AnyEvent::Handle: only stream sockets supported, anything else will NOT work!"
		590	if Socket::SOCK_STREAM () != (unpack "I", $type) && defined $type;
310		591
311	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	592	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
312		593
		594	$self->{_activity} =
		595	$self->{_ractivity} =
313	$self->{_activity} = AnyEvent->now;	596	$self->{_wactivity} = AE::now;
314	$self->_timeout;
315		597
		598	$self->{read_size} ||= 2048;
		599	$self->{max_read_size} = $self->{read_size}
		600	if $self->{read_size} > ($self->{max_read_size} || MAX_READ_SIZE);
		601
		602	$self->timeout (delete $self->{timeout} ) if $self->{timeout};
		603	$self->rtimeout (delete $self->{rtimeout} ) if $self->{rtimeout};
		604	$self->wtimeout (delete $self->{wtimeout} ) if $self->{wtimeout};
		605
316	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};	606	$self->no_delay (delete $self->{no_delay} ) if exists $self->{no_delay} && $self->{no_delay};
		607	$self->keepalive (delete $self->{keepalive}) if exists $self->{keepalive} && $self->{keepalive};
317		608
		609	$self->oobinline (exists $self->{oobinline} ? delete $self->{oobinline} : 1);
		610
318	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})	611	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})
319	if $self->{tls};	612	if $self->{tls};
320		613
321	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};	614	$self->on_drain (delete $self->{on_drain} ) if $self->{on_drain};
322		615
323	$self->start_read	616	$self->start_read
324	if $self->{on_read};	617	if $self->{on_read} || @{ $self->{_queue} };
325		618
326	$self->{fh} && $self	619	$self->_drain_wbuf;
327	}
328
329	sub _shutdown {
330	my ($self) = @_;
331
332	delete @$self{qw(_tw _rw _ww fh wbuf on_read _queue)};
333	$self->{_eof} = 1; # tell starttls et. al to stop trying
334
335	&_freetls;
336	}	620	}
337		621
338	sub _error {	622	sub _error {
339	my ($self, $errno, $fatal) = @_;	623	my ($self, $errno, $fatal, $message) = @_;
340
341	$self->_shutdown
342	if $fatal;
343		624
344	$! = $errno;	625	$! = $errno;
		626	$message ||= "$!";
345		627
346	if ($self->{on_error}) {	628	if ($self->{on_error}) {
347	$self->{on_error}($self, $fatal);	629	$self->{on_error}($self, $fatal, $message);
348	} elsif ($self->{fh}) {	630	$self->destroy if $fatal;
		631	} elsif ($self->{fh} || $self->{connect}) {
		632	$self->destroy;
349	Carp::croak "AnyEvent::Handle uncaught error: $!";	633	Carp::croak "AnyEvent::Handle uncaught error: $message";
350	}	634	}
351	}	635	}
352		636
353	=item $fh = $handle->fh	637	=item $fh = $handle->fh
354		638
…		…
378	$_[0]{on_eof} = $_[1];	662	$_[0]{on_eof} = $_[1];
379	}	663	}
380		664
381	=item $handle->on_timeout ($cb)	665	=item $handle->on_timeout ($cb)
382		666
383	Replace the current C<on_timeout> callback, or disables the callback (but	667	=item $handle->on_rtimeout ($cb)
384	not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor
385	argument and method.
386		668
387	=cut	669	=item $handle->on_wtimeout ($cb)
388		670
389	sub on_timeout {	671	Replace the current C<on_timeout>, C<on_rtimeout> or C<on_wtimeout>
390	$_[0]{on_timeout} = $_[1];	672	callback, or disables the callback (but not the timeout) if C<$cb> =
391	}	673	C<undef>. See the C<timeout> constructor argument and method.
		674
		675	=cut
		676
		677	# see below
392		678
393	=item $handle->autocork ($boolean)	679	=item $handle->autocork ($boolean)
394		680
395	Enables or disables the current autocork behaviour (see C<autocork>	681	Enables or disables the current autocork behaviour (see C<autocork>
396	constructor argument). Changes will only take effect on the next write.	682	constructor argument). Changes will only take effect on the next write.
…		…
409	=cut	695	=cut
410		696
411	sub no_delay {	697	sub no_delay {
412	$_[0]{no_delay} = $_[1];	698	$_[0]{no_delay} = $_[1];
413		699
		700	setsockopt $_[0]{fh}, Socket::IPPROTO_TCP (), Socket::TCP_NODELAY (), int $_[1]
		701	if $_[0]{fh};
		702	}
		703
		704	=item $handle->keepalive ($boolean)
		705
		706	Enables or disables the C<keepalive> setting (see constructor argument of
		707	the same name for details).
		708
		709	=cut
		710
		711	sub keepalive {
		712	$_[0]{keepalive} = $_[1];
		713
414	eval {	714	eval {
415	local $SIG{__DIE__};	715	local $SIG{__DIE__};
416	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1];	716	setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_KEEPALIVE (), int $_[1]
		717	if $_[0]{fh};
417	};	718	};
418	}	719	}
419		720
		721	=item $handle->oobinline ($boolean)
		722
		723	Enables or disables the C<oobinline> setting (see constructor argument of
		724	the same name for details).
		725
		726	=cut
		727
		728	sub oobinline {
		729	$_[0]{oobinline} = $_[1];
		730
		731	eval {
		732	local $SIG{__DIE__};
		733	setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_OOBINLINE (), int $_[1]
		734	if $_[0]{fh};
		735	};
		736	}
		737
		738	=item $handle->keepalive ($boolean)
		739
		740	Enables or disables the C<keepalive> setting (see constructor argument of
		741	the same name for details).
		742
		743	=cut
		744
		745	sub keepalive {
		746	$_[0]{keepalive} = $_[1];
		747
		748	eval {
		749	local $SIG{__DIE__};
		750	setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_KEEPALIVE (), int $_[1]
		751	if $_[0]{fh};
		752	};
		753	}
		754
		755	=item $handle->on_starttls ($cb)
		756
		757	Replace the current C<on_starttls> callback (see the C<on_starttls> constructor argument).
		758
		759	=cut
		760
		761	sub on_starttls {
		762	$_[0]{on_starttls} = $_[1];
		763	}
		764
		765	=item $handle->on_stoptls ($cb)
		766
		767	Replace the current C<on_stoptls> callback (see the C<on_stoptls> constructor argument).
		768
		769	=cut
		770
		771	sub on_stoptls {
		772	$_[0]{on_stoptls} = $_[1];
		773	}
		774
		775	=item $handle->rbuf_max ($max_octets)
		776
		777	Configures the C<rbuf_max> setting (C<undef> disables it).
		778
		779	=item $handle->wbuf_max ($max_octets)
		780
		781	Configures the C<wbuf_max> setting (C<undef> disables it).
		782
		783	=cut
		784
		785	sub rbuf_max {
		786	$_[0]{rbuf_max} = $_[1];
		787	}
		788
		789	sub wbuf_max {
		790	$_[0]{wbuf_max} = $_[1];
		791	}
		792
420	#############################################################################	793	#############################################################################
421		794
422	=item $handle->timeout ($seconds)	795	=item $handle->timeout ($seconds)
423		796
		797	=item $handle->rtimeout ($seconds)
		798
		799	=item $handle->wtimeout ($seconds)
		800
424	Configures (or disables) the inactivity timeout.	801	Configures (or disables) the inactivity timeout.
425		802
426	=cut	803	The timeout will be checked instantly, so this method might destroy the
		804	handle before it returns.
427		805
428	sub timeout {	806	=item $handle->timeout_reset
		807
		808	=item $handle->rtimeout_reset
		809
		810	=item $handle->wtimeout_reset
		811
		812	Reset the activity timeout, as if data was received or sent.
		813
		814	These methods are cheap to call.
		815
		816	=cut
		817
		818	for my $dir ("", "r", "w") {
		819	my $timeout = "${dir}timeout";
		820	my $tw = "_${dir}tw";
		821	my $on_timeout = "on_${dir}timeout";
		822	my $activity = "_${dir}activity";
		823	my $cb;
		824
		825	*$on_timeout = sub {
		826	$_[0]{$on_timeout} = $_[1];
		827	};
		828
		829	*$timeout = sub {
429	my ($self, $timeout) = @_;	830	my ($self, $new_value) = @_;
430		831
		832	$new_value >= 0
		833	or Carp::croak "AnyEvent::Handle->$timeout called with negative timeout ($new_value), caught";
		834
431	$self->{timeout} = $timeout;	835	$self->{$timeout} = $new_value;
432	$self->_timeout;	836	delete $self->{$tw}; &$cb;
433	}	837	};
434		838
		839	*{"${dir}timeout_reset"} = sub {
		840	$_[0]{$activity} = AE::now;
		841	};
		842
		843	# main workhorse:
435	# reset the timeout watcher, as neccessary	844	# reset the timeout watcher, as neccessary
436	# also check for time-outs	845	# also check for time-outs
437	sub _timeout {	846	$cb = sub {
438	my ($self) = @_;	847	my ($self) = @_;
439		848
440	if ($self->{timeout}) {	849	if ($self->{$timeout} && $self->{fh}) {
441	my $NOW = AnyEvent->now;	850	my $NOW = AE::now;
442		851
443	# when would the timeout trigger?	852	# when would the timeout trigger?
444	my $after = $self->{_activity} + $self->{timeout} - $NOW;	853	my $after = $self->{$activity} + $self->{$timeout} - $NOW;
445		854
446	# now or in the past already?	855	# now or in the past already?
447	if ($after <= 0) {	856	if ($after <= 0) {
448	$self->{_activity} = $NOW;	857	$self->{$activity} = $NOW;
449		858
450	if ($self->{on_timeout}) {	859	if ($self->{$on_timeout}) {
451	$self->{on_timeout}($self);	860	$self->{$on_timeout}($self);
452	} else {	861	} else {
453	$self->_error (&Errno::ETIMEDOUT);	862	$self->_error (Errno::ETIMEDOUT);
		863	}
		864
		865	# callback could have changed timeout value, optimise
		866	return unless $self->{$timeout};
		867
		868	# calculate new after
		869	$after = $self->{$timeout};
454	}	870	}
455		871
456	# callback could have changed timeout value, optimise	872	Scalar::Util::weaken $self;
457	return unless $self->{timeout};	873	return unless $self; # ->error could have destroyed $self
458		874
459	# calculate new after	875	$self->{$tw} ||= AE::timer $after, 0, sub {
460	$after = $self->{timeout};	876	delete $self->{$tw};
		877	$cb->($self);
		878	};
		879	} else {
		880	delete $self->{$tw};
461	}	881	}
462
463	Scalar::Util::weaken $self;
464	return unless $self; # ->error could have destroyed $self
465
466	$self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub {
467	delete $self->{_tw};
468	$self->_timeout;
469	});
470	} else {
471	delete $self->{_tw};
472	}	882	}
473	}	883	}
474		884
475	#############################################################################	885	#############################################################################
476		886
…		…
483		893
484	The write queue is very simple: you can add data to its end, and	894	The write queue is very simple: you can add data to its end, and
485	AnyEvent::Handle will automatically try to get rid of it for you.	895	AnyEvent::Handle will automatically try to get rid of it for you.
486		896
487	When data could be written and the write buffer is shorter then the low	897	When data could be written and the write buffer is shorter then the low
488	water mark, the C<on_drain> callback will be invoked.	898	water mark, the C<on_drain> callback will be invoked once.
489		899
490	=over 4	900	=over 4
491		901
492	=item $handle->on_drain ($cb)	902	=item $handle->on_drain ($cb)
493		903
494	Sets the C<on_drain> callback or clears it (see the description of	904	Sets the C<on_drain> callback or clears it (see the description of
495	C<on_drain> in the constructor).	905	C<on_drain> in the constructor).
496		906
		907	This method may invoke callbacks (and therefore the handle might be
		908	destroyed after it returns).
		909
497	=cut	910	=cut
498		911
499	sub on_drain {	912	sub on_drain {
500	my ($self, $cb) = @_;	913	my ($self, $cb) = @_;
501		914
…		…
505	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});	918	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});
506	}	919	}
507		920
508	=item $handle->push_write ($data)	921	=item $handle->push_write ($data)
509		922
510	Queues the given scalar to be written. You can push as much data as you	923	Queues the given scalar to be written. You can push as much data as
511	want (only limited by the available memory), as C<AnyEvent::Handle>	924	you want (only limited by the available memory and C<wbuf_max>), as
512	buffers it independently of the kernel.	925	C<AnyEvent::Handle> buffers it independently of the kernel.
		926
		927	This method may invoke callbacks (and therefore the handle might be
		928	destroyed after it returns).
513		929
514	=cut	930	=cut
515		931
516	sub _drain_wbuf {	932	sub _drain_wbuf {
517	my ($self) = @_;	933	my ($self) = @_;
…		…
521	Scalar::Util::weaken $self;	937	Scalar::Util::weaken $self;
522		938
523	my $cb = sub {	939	my $cb = sub {
524	my $len = syswrite $self->{fh}, $self->{wbuf};	940	my $len = syswrite $self->{fh}, $self->{wbuf};
525		941
526	if ($len >= 0) {	942	if (defined $len) {
527	substr $self->{wbuf}, 0, $len, "";	943	substr $self->{wbuf}, 0, $len, "";
528		944
529	$self->{_activity} = AnyEvent->now;	945	$self->{_activity} = $self->{_wactivity} = AE::now;
530		946
531	$self->{on_drain}($self)	947	$self->{on_drain}($self)
532	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})	948	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
533	&& $self->{on_drain};	949	&& $self->{on_drain};
534		950
…		…
540		956
541	# try to write data immediately	957	# try to write data immediately
542	$cb->() unless $self->{autocork};	958	$cb->() unless $self->{autocork};
543		959
544	# if still data left in wbuf, we need to poll	960	# if still data left in wbuf, we need to poll
545	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)	961	$self->{_ww} = AE::io $self->{fh}, 1, $cb
546	if length $self->{wbuf};	962	if length $self->{wbuf};
		963
		964	if (
		965	defined $self->{wbuf_max}
		966	&& $self->{wbuf_max} < length $self->{wbuf}
		967	) {
		968	$self->_error (Errno::ENOSPC, 1), return;
		969	}
547	};	970	};
548	}	971	}
549		972
550	our %WH;	973	our %WH;
551		974
		975	# deprecated
552	sub register_write_type($$) {	976	sub register_write_type($$) {
553	$WH{$_[0]} = $_[1];	977	$WH{$_[0]} = $_[1];
554	}	978	}
555		979
556	sub push_write {	980	sub push_write {
557	my $self = shift;	981	my $self = shift;
558		982
559	if (@_ > 1) {	983	if (@_ > 1) {
560	my $type = shift;	984	my $type = shift;
561		985
		986	@_ = ($WH{$type} ||= _load_func "$type\::anyevent_write_type"
562	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")	987	or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::push_write")
563	->($self, @_);	988	->($self, @_);
564	}	989	}
565		990
		991	# we downgrade here to avoid hard-to-track-down bugs,
		992	# and diagnose the problem earlier and better.
		993
566	if ($self->{tls}) {	994	if ($self->{tls}) {
567	$self->{_tls_wbuf} .= $_[0];	995	utf8::downgrade $self->{_tls_wbuf} .= $_[0];
568		996	&_dotls ($self) if $self->{fh};
569	&_dotls ($self);
570	} else {	997	} else {
571	$self->{wbuf} .= $_[0];	998	utf8::downgrade $self->{wbuf} .= $_[0];
572	$self->_drain_wbuf;	999	$self->_drain_wbuf if $self->{fh};
573	}	1000	}
574	}	1001	}
575		1002
576	=item $handle->push_write (type => @args)	1003	=item $handle->push_write (type => @args)
577		1004
578	Instead of formatting your data yourself, you can also let this module do	1005	Instead of formatting your data yourself, you can also let this module
579	the job by specifying a type and type-specific arguments.	1006	do the job by specifying a type and type-specific arguments. You
		1007	can also specify the (fully qualified) name of a package, in which
		1008	case AnyEvent tries to load the package and then expects to find the
		1009	C<anyevent_write_type> function inside (see "custom write types", below).
580		1010
581	Predefined types are (if you have ideas for additional types, feel free to	1011	Predefined types are (if you have ideas for additional types, feel free to
582	drop by and tell us):	1012	drop by and tell us):
583		1013
584	=over 4	1014	=over 4
…		…
641	Other languages could read single lines terminated by a newline and pass	1071	Other languages could read single lines terminated by a newline and pass
642	this line into their JSON decoder of choice.	1072	this line into their JSON decoder of choice.
643		1073
644	=cut	1074	=cut
645		1075
		1076	sub json_coder() {
		1077	eval { require JSON::XS; JSON::XS->new->utf8 }
		1078	|| do { require JSON; JSON->new->utf8 }
		1079	}
		1080
646	register_write_type json => sub {	1081	register_write_type json => sub {
647	my ($self, $ref) = @_;	1082	my ($self, $ref) = @_;
648		1083
649	require JSON;	1084	my $json = $self->{json} ||= json_coder;
650		1085
651	$self->{json} ? $self->{json}->encode ($ref)	1086	$json->encode ($ref)
652	: JSON::encode_json ($ref)
653	};	1087	};
654		1088
655	=item storable => $reference	1089	=item storable => $reference
656		1090
657	Freezes the given reference using L<Storable> and writes it to the	1091	Freezes the given reference using L<Storable> and writes it to the
…		…
660	=cut	1094	=cut
661		1095
662	register_write_type storable => sub {	1096	register_write_type storable => sub {
663	my ($self, $ref) = @_;	1097	my ($self, $ref) = @_;
664		1098
665	require Storable;	1099	require Storable unless $Storable::VERSION;
666		1100
667	pack "w/a*", Storable::nfreeze ($ref)	1101	pack "w/a*", Storable::nfreeze ($ref)
668	};	1102	};
669		1103
670	=back	1104	=back
671		1105
672	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)	1106	=item $handle->push_shutdown
673		1107
674	This function (not method) lets you add your own types to C<push_write>.	1108	Sometimes you know you want to close the socket after writing your data
		1109	before it was actually written. One way to do that is to replace your
		1110	C<on_drain> handler by a callback that shuts down the socket (and set
		1111	C<low_water_mark> to C<0>). This method is a shorthand for just that, and
		1112	replaces the C<on_drain> callback with:
		1113
		1114	sub { shutdown $_[0]{fh}, 1 }
		1115
		1116	This simply shuts down the write side and signals an EOF condition to the
		1117	the peer.
		1118
		1119	You can rely on the normal read queue and C<on_eof> handling
		1120	afterwards. This is the cleanest way to close a connection.
		1121
		1122	This method may invoke callbacks (and therefore the handle might be
		1123	destroyed after it returns).
		1124
		1125	=cut
		1126
		1127	sub push_shutdown {
		1128	my ($self) = @_;
		1129
		1130	delete $self->{low_water_mark};
		1131	$self->on_drain (sub { shutdown $_[0]{fh}, 1 });
		1132	}
		1133
		1134	=item custom write types - Package::anyevent_write_type $handle, @args
		1135
		1136	Instead of one of the predefined types, you can also specify the name of
		1137	a package. AnyEvent will try to load the package and then expects to find
		1138	a function named C<anyevent_write_type> inside. If it isn't found, it
		1139	progressively tries to load the parent package until it either finds the
		1140	function (good) or runs out of packages (bad).
		1141
675	Whenever the given C<type> is used, C<push_write> will invoke the code	1142	Whenever the given C<type> is used, C<push_write> will the function with
676	reference with the handle object and the remaining arguments.	1143	the handle object and the remaining arguments.
677		1144
678	The code reference is supposed to return a single octet string that will	1145	The function is supposed to return a single octet string that will be
679	be appended to the write buffer.	1146	appended to the write buffer, so you can mentally treat this function as a
		1147	"arguments to on-the-wire-format" converter.
680		1148
681	Note that this is a function, and all types registered this way will be	1149	Example: implement a custom write type C<join> that joins the remaining
682	global, so try to use unique names.	1150	arguments using the first one.
		1151
		1152	$handle->push_write (My::Type => " ", 1,2,3);
		1153
		1154	# uses the following package, which can be defined in the "My::Type" or in
		1155	# the "My" modules to be auto-loaded, or just about anywhere when the
		1156	# My::Type::anyevent_write_type is defined before invoking it.
		1157
		1158	package My::Type;
		1159
		1160	sub anyevent_write_type {
		1161	my ($handle, $delim, @args) = @_;
		1162
		1163	join $delim, @args
		1164	}
683		1165
684	=cut	1166	=cut
685		1167
686	#############################################################################	1168	#############################################################################
687		1169
…		…
696	ways, the "simple" way, using only C<on_read> and the "complex" way, using	1178	ways, the "simple" way, using only C<on_read> and the "complex" way, using
697	a queue.	1179	a queue.
698		1180
699	In the simple case, you just install an C<on_read> callback and whenever	1181	In the simple case, you just install an C<on_read> callback and whenever
700	new data arrives, it will be called. You can then remove some data (if	1182	new data arrives, it will be called. You can then remove some data (if
701	enough is there) from the read buffer (C<< $handle->rbuf >>). Or you cna	1183	enough is there) from the read buffer (C<< $handle->rbuf >>). Or you can
702	leave the data there if you want to accumulate more (e.g. when only a	1184	leave the data there if you want to accumulate more (e.g. when only a
703	partial message has been received so far).	1185	partial message has been received so far), or change the read queue with
		1186	e.g. C<push_read>.
704		1187
705	In the more complex case, you want to queue multiple callbacks. In this	1188	In the more complex case, you want to queue multiple callbacks. In this
706	case, AnyEvent::Handle will call the first queued callback each time new	1189	case, AnyEvent::Handle will call the first queued callback each time new
707	data arrives (also the first time it is queued) and removes it when it has	1190	data arrives (also the first time it is queued) and remove it when it has
708	done its job (see C<push_read>, below).	1191	done its job (see C<push_read>, below).
709		1192
710	This way you can, for example, push three line-reads, followed by reading	1193	This way you can, for example, push three line-reads, followed by reading
711	a chunk of data, and AnyEvent::Handle will execute them in order.	1194	a chunk of data, and AnyEvent::Handle will execute them in order.
712		1195
…		…
769	=cut	1252	=cut
770		1253
771	sub _drain_rbuf {	1254	sub _drain_rbuf {
772	my ($self) = @_;	1255	my ($self) = @_;
773		1256
		1257	# avoid recursion
		1258	return if $self->{_skip_drain_rbuf};
774	local $self->{_in_drain} = 1;	1259	local $self->{_skip_drain_rbuf} = 1;
775
776	if (
777	defined $self->{rbuf_max}
778	&& $self->{rbuf_max} < length $self->{rbuf}
779	) {
780	$self->_error (&Errno::ENOSPC, 1), return;
781	}
782		1260
783	while () {	1261	while () {
784	# we need to use a separate tls read buffer, as we must not receive data while	1262	# we need to use a separate tls read buffer, as we must not receive data while
785	# we are draining the buffer, and this can only happen with TLS.	1263	# we are draining the buffer, and this can only happen with TLS.
786	$self->{rbuf} .= delete $self->{_tls_rbuf} if exists $self->{_tls_rbuf};	1264	$self->{rbuf} .= delete $self->{_tls_rbuf}
		1265	if exists $self->{_tls_rbuf};
787		1266
788	my $len = length $self->{rbuf};	1267	my $len = length $self->{rbuf};
789		1268
790	if (my $cb = shift @{ $self->{_queue} }) {	1269	if (my $cb = shift @{ $self->{_queue} }) {
791	unless ($cb->($self)) {	1270	unless ($cb->($self)) {
792	if ($self->{_eof}) {	1271	# no progress can be made
793	# no progress can be made (not enough data and no data forthcoming)	1272	# (not enough data and no data forthcoming)
794	$self->_error (&Errno::EPIPE, 1), return;	1273	$self->_error (Errno::EPIPE, 1), return
795	}	1274	if $self->{_eof};
796		1275
797	unshift @{ $self->{_queue} }, $cb;	1276	unshift @{ $self->{_queue} }, $cb;
798	last;	1277	last;
799	}	1278	}
800	} elsif ($self->{on_read}) {	1279	} elsif ($self->{on_read}) {
…		…
807	&& !@{ $self->{_queue} } # and the queue is still empty	1286	&& !@{ $self->{_queue} } # and the queue is still empty
808	&& $self->{on_read} # but we still have on_read	1287	&& $self->{on_read} # but we still have on_read
809	) {	1288	) {
810	# no further data will arrive	1289	# no further data will arrive
811	# so no progress can be made	1290	# so no progress can be made
812	$self->_error (&Errno::EPIPE, 1), return	1291	$self->_error (Errno::EPIPE, 1), return
813	if $self->{_eof};	1292	if $self->{_eof};
814		1293
815	last; # more data might arrive	1294	last; # more data might arrive
816	}	1295	}
817	} else {	1296	} else {
…		…
820	last;	1299	last;
821	}	1300	}
822	}	1301	}
823		1302
824	if ($self->{_eof}) {	1303	if ($self->{_eof}) {
825	if ($self->{on_eof}) {	1304	$self->{on_eof}
826	$self->{on_eof}($self)	1305	? $self->{on_eof}($self)
827	} else {	1306	: $self->_error (0, 1, "Unexpected end-of-file");
828	$self->_error (0, 1);	1307
829	}	1308	return;
		1309	}
		1310
		1311	if (
		1312	defined $self->{rbuf_max}
		1313	&& $self->{rbuf_max} < length $self->{rbuf}
		1314	) {
		1315	$self->_error (Errno::ENOSPC, 1), return;
830	}	1316	}
831		1317
832	# may need to restart read watcher	1318	# may need to restart read watcher
833	unless ($self->{_rw}) {	1319	unless ($self->{_rw}) {
834	$self->start_read	1320	$self->start_read
…		…
840		1326
841	This replaces the currently set C<on_read> callback, or clears it (when	1327	This replaces the currently set C<on_read> callback, or clears it (when
842	the new callback is C<undef>). See the description of C<on_read> in the	1328	the new callback is C<undef>). See the description of C<on_read> in the
843	constructor.	1329	constructor.
844		1330
		1331	This method may invoke callbacks (and therefore the handle might be
		1332	destroyed after it returns).
		1333
845	=cut	1334	=cut
846		1335
847	sub on_read {	1336	sub on_read {
848	my ($self, $cb) = @_;	1337	my ($self, $cb) = @_;
849		1338
850	$self->{on_read} = $cb;	1339	$self->{on_read} = $cb;
851	$self->_drain_rbuf if $cb && !$self->{_in_drain};	1340	$self->_drain_rbuf if $cb;
852	}	1341	}
853		1342
854	=item $handle->rbuf	1343	=item $handle->rbuf
855		1344
856	Returns the read buffer (as a modifiable lvalue).	1345	Returns the read buffer (as a modifiable lvalue). You can also access the
		1346	read buffer directly as the C<< ->{rbuf} >> member, if you want (this is
		1347	much faster, and no less clean).
857		1348
858	You can access the read buffer directly as the C<< ->{rbuf} >>	1349	The only operation allowed on the read buffer (apart from looking at it)
859	member, if you want. However, the only operation allowed on the	1350	is removing data from its beginning. Otherwise modifying or appending to
860	read buffer (apart from looking at it) is removing data from its	1351	it is not allowed and will lead to hard-to-track-down bugs.
861	beginning. Otherwise modifying or appending to it is not allowed and will
862	lead to hard-to-track-down bugs.
863		1352
864	NOTE: The read buffer should only be used or modified if the C<on_read>,	1353	NOTE: The read buffer should only be used or modified in the C<on_read>
865	C<push_read> or C<unshift_read> methods are used. The other read methods	1354	callback or when C<push_read> or C<unshift_read> are used with a single
866	automatically manage the read buffer.	1355	callback (i.e. untyped). Typed C<push_read> and C<unshift_read> methods
		1356	will manage the read buffer on their own.
867		1357
868	=cut	1358	=cut
869		1359
870	sub rbuf : lvalue {	1360	sub rbuf : lvalue {
871	$_[0]{rbuf}	1361	$_[0]{rbuf}
…		…
888		1378
889	If enough data was available, then the callback must remove all data it is	1379	If enough data was available, then the callback must remove all data it is
890	interested in (which can be none at all) and return a true value. After returning	1380	interested in (which can be none at all) and return a true value. After returning
891	true, it will be removed from the queue.	1381	true, it will be removed from the queue.
892		1382
		1383	These methods may invoke callbacks (and therefore the handle might be
		1384	destroyed after it returns).
		1385
893	=cut	1386	=cut
894		1387
895	our %RH;	1388	our %RH;
896		1389
897	sub register_read_type($$) {	1390	sub register_read_type($$) {
…		…
903	my $cb = pop;	1396	my $cb = pop;
904		1397
905	if (@_) {	1398	if (@_) {
906	my $type = shift;	1399	my $type = shift;
907		1400
		1401	$cb = ($RH{$type} ||= _load_func "$type\::anyevent_read_type"
908	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")	1402	or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::push_read")
909	->($self, $cb, @_);	1403	->($self, $cb, @_);
910	}	1404	}
911		1405
912	push @{ $self->{_queue} }, $cb;	1406	push @{ $self->{_queue} }, $cb;
913	$self->_drain_rbuf unless $self->{_in_drain};	1407	$self->_drain_rbuf;
914	}	1408	}
915		1409
916	sub unshift_read {	1410	sub unshift_read {
917	my $self = shift;	1411	my $self = shift;
918	my $cb = pop;	1412	my $cb = pop;
919		1413
920	if (@_) {	1414	if (@_) {
921	my $type = shift;	1415	my $type = shift;
922		1416
		1417	$cb = ($RH{$type} ||= _load_func "$type\::anyevent_read_type"
923	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read")	1418	or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::unshift_read")
924	->($self, $cb, @_);	1419	->($self, $cb, @_);
925	}	1420	}
926		1421
927
928	unshift @{ $self->{_queue} }, $cb;	1422	unshift @{ $self->{_queue} }, $cb;
929	$self->_drain_rbuf unless $self->{_in_drain};	1423	$self->_drain_rbuf;
930	}	1424	}
931		1425
932	=item $handle->push_read (type => @args, $cb)	1426	=item $handle->push_read (type => @args, $cb)
933		1427
934	=item $handle->unshift_read (type => @args, $cb)	1428	=item $handle->unshift_read (type => @args, $cb)
935		1429
936	Instead of providing a callback that parses the data itself you can chose	1430	Instead of providing a callback that parses the data itself you can chose
937	between a number of predefined parsing formats, for chunks of data, lines	1431	between a number of predefined parsing formats, for chunks of data, lines
938	etc.	1432	etc. You can also specify the (fully qualified) name of a package, in
		1433	which case AnyEvent tries to load the package and then expects to find the
		1434	C<anyevent_read_type> function inside (see "custom read types", below).
939		1435
940	Predefined types are (if you have ideas for additional types, feel free to	1436	Predefined types are (if you have ideas for additional types, feel free to
941	drop by and tell us):	1437	drop by and tell us):
942		1438
943	=over 4	1439	=over 4
…		…
949	data.	1445	data.
950		1446
951	Example: read 2 bytes.	1447	Example: read 2 bytes.
952		1448
953	$handle->push_read (chunk => 2, sub {	1449	$handle->push_read (chunk => 2, sub {
954	warn "yay ", unpack "H*", $_[1];	1450	say "yay " . unpack "H*", $_[1];
955	});	1451	});
956		1452
957	=cut	1453	=cut
958		1454
959	register_read_type chunk => sub {	1455	register_read_type chunk => sub {
…		…
989		1485
990	register_read_type line => sub {	1486	register_read_type line => sub {
991	my ($self, $cb, $eol) = @_;	1487	my ($self, $cb, $eol) = @_;
992		1488
993	if (@_ < 3) {	1489	if (@_ < 3) {
994	# this is more than twice as fast as the generic code below	1490	# this is faster then the generic code below
995	sub {	1491	sub {
996	$_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return;	1492	(my $pos = index $_[0]{rbuf}, "\012") >= 0
		1493	or return;
997		1494
		1495	(my $str = substr $_[0]{rbuf}, 0, $pos + 1, "") =~ s/(\015?\012)\Z// or die;
998	$cb->($_[0], $1, $2);	1496	$cb->($_[0], $str, "$1");
999	1	1497	1
1000	}	1498	}
1001	} else {	1499	} else {
1002	$eol = quotemeta $eol unless ref $eol;	1500	$eol = quotemeta $eol unless ref $eol;
1003	$eol = qr|^(.*?)($eol)|s;	1501	$eol = qr|^(.*?)($eol)|s;
1004		1502
1005	sub {	1503	sub {
1006	$_[0]{rbuf} =~ s/$eol// or return;	1504	$_[0]{rbuf} =~ s/$eol// or return;
1007		1505
1008	$cb->($_[0], $1, $2);	1506	$cb->($_[0], "$1", "$2");
1009	1	1507	1
1010	}	1508	}
1011	}	1509	}
1012	};	1510	};
1013		1511
…		…
1035	the receive buffer when neither C<$accept> nor C<$reject> match,	1533	the receive buffer when neither C<$accept> nor C<$reject> match,
1036	and everything preceding and including the match will be accepted	1534	and everything preceding and including the match will be accepted
1037	unconditionally. This is useful to skip large amounts of data that you	1535	unconditionally. This is useful to skip large amounts of data that you
1038	know cannot be matched, so that the C<$accept> or C<$reject> regex do not	1536	know cannot be matched, so that the C<$accept> or C<$reject> regex do not
1039	have to start matching from the beginning. This is purely an optimisation	1537	have to start matching from the beginning. This is purely an optimisation
1040	and is usually worth only when you expect more than a few kilobytes.	1538	and is usually worth it only when you expect more than a few kilobytes.
1041		1539
1042	Example: expect a http header, which ends at C<\015\012\015\012>. Since we	1540	Example: expect a http header, which ends at C<\015\012\015\012>. Since we
1043	expect the header to be very large (it isn't in practise, but...), we use	1541	expect the header to be very large (it isn't in practice, but...), we use
1044	a skip regex to skip initial portions. The skip regex is tricky in that	1542	a skip regex to skip initial portions. The skip regex is tricky in that
1045	it only accepts something not ending in either \015 or \012, as these are	1543	it only accepts something not ending in either \015 or \012, as these are
1046	required for the accept regex.	1544	required for the accept regex.
1047		1545
1048	$handle->push_read (regex =>	1546	$handle->push_read (regex =>
…		…
1061		1559
1062	sub {	1560	sub {
1063	# accept	1561	# accept
1064	if ($$rbuf =~ $accept) {	1562	if ($$rbuf =~ $accept) {
1065	$data .= substr $$rbuf, 0, $+[0], "";	1563	$data .= substr $$rbuf, 0, $+[0], "";
1066	$cb->($self, $data);	1564	$cb->($_[0], $data);
1067	return 1;	1565	return 1;
1068	}	1566	}
1069		1567
1070	# reject	1568	# reject
1071	if ($reject && $$rbuf =~ $reject) {	1569	if ($reject && $$rbuf =~ $reject) {
1072	$self->_error (&Errno::EBADMSG);	1570	$_[0]->_error (Errno::EBADMSG);
1073	}	1571	}
1074		1572
1075	# skip	1573	# skip
1076	if ($skip && $$rbuf =~ $skip) {	1574	if ($skip && $$rbuf =~ $skip) {
1077	$data .= substr $$rbuf, 0, $+[0], "";	1575	$data .= substr $$rbuf, 0, $+[0], "";
…		…
1093	my ($self, $cb) = @_;	1591	my ($self, $cb) = @_;
1094		1592
1095	sub {	1593	sub {
1096	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {	1594	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {
1097	if ($_[0]{rbuf} =~ /[^0-9]/) {	1595	if ($_[0]{rbuf} =~ /[^0-9]/) {
1098	$self->_error (&Errno::EBADMSG);	1596	$_[0]->_error (Errno::EBADMSG);
1099	}	1597	}
1100	return;	1598	return;
1101	}	1599	}
1102		1600
1103	my $len = $1;	1601	my $len = $1;
1104		1602
1105	$self->unshift_read (chunk => $len, sub {	1603	$_[0]->unshift_read (chunk => $len, sub {
1106	my $string = $_[1];	1604	my $string = $_[1];
1107	$_[0]->unshift_read (chunk => 1, sub {	1605	$_[0]->unshift_read (chunk => 1, sub {
1108	if ($_[1] eq ",") {	1606	if ($_[1] eq ",") {
1109	$cb->($_[0], $string);	1607	$cb->($_[0], $string);
1110	} else {	1608	} else {
1111	$self->_error (&Errno::EBADMSG);	1609	$_[0]->_error (Errno::EBADMSG);
1112	}	1610	}
1113	});	1611	});
1114	});	1612	});
1115		1613
1116	1	1614	1
…		…
1183	=cut	1681	=cut
1184		1682
1185	register_read_type json => sub {	1683	register_read_type json => sub {
1186	my ($self, $cb) = @_;	1684	my ($self, $cb) = @_;
1187		1685
1188	require JSON;	1686	my $json = $self->{json} ||= json_coder;
1189		1687
1190	my $data;	1688	my $data;
1191	my $rbuf = \$self->{rbuf};	1689	my $rbuf = \$self->{rbuf};
1192		1690
1193	my $json = $self->{json} ||= JSON->new->utf8;
1194
1195	sub {	1691	sub {
1196	my $ref = eval { $json->incr_parse ($self->{rbuf}) };	1692	my $ref = eval { $json->incr_parse ($_[0]{rbuf}) };
1197		1693
1198	if ($ref) {	1694	if ($ref) {
1199	$self->{rbuf} = $json->incr_text;	1695	$_[0]{rbuf} = $json->incr_text;
1200	$json->incr_text = "";	1696	$json->incr_text = "";
1201	$cb->($self, $ref);	1697	$cb->($_[0], $ref);
1202		1698
1203	1	1699	1
1204	} elsif ($@) {	1700	} elsif ($@) {
1205	# error case	1701	# error case
1206	$json->incr_skip;	1702	$json->incr_skip;
1207		1703
1208	$self->{rbuf} = $json->incr_text;	1704	$_[0]{rbuf} = $json->incr_text;
1209	$json->incr_text = "";	1705	$json->incr_text = "";
1210		1706
1211	$self->_error (&Errno::EBADMSG);	1707	$_[0]->_error (Errno::EBADMSG);
1212		1708
1213	()	1709	()
1214	} else {	1710	} else {
1215	$self->{rbuf} = "";	1711	$_[0]{rbuf} = "";
1216		1712
1217	()	1713	()
1218	}	1714	}
1219	}	1715	}
1220	};	1716	};
…		…
1230	=cut	1726	=cut
1231		1727
1232	register_read_type storable => sub {	1728	register_read_type storable => sub {
1233	my ($self, $cb) = @_;	1729	my ($self, $cb) = @_;
1234		1730
1235	require Storable;	1731	require Storable unless $Storable::VERSION;
1236		1732
1237	sub {	1733	sub {
1238	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method	1734	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method
1239	defined (my $len = eval { unpack "w", $_[0]{rbuf} })	1735	defined (my $len = eval { unpack "w", $_[0]{rbuf} })
1240	or return;	1736	or return;
…		…
1243		1739
1244	# bypass unshift if we already have the remaining chunk	1740	# bypass unshift if we already have the remaining chunk
1245	if ($format + $len <= length $_[0]{rbuf}) {	1741	if ($format + $len <= length $_[0]{rbuf}) {
1246	my $data = substr $_[0]{rbuf}, $format, $len;	1742	my $data = substr $_[0]{rbuf}, $format, $len;
1247	substr $_[0]{rbuf}, 0, $format + $len, "";	1743	substr $_[0]{rbuf}, 0, $format + $len, "";
		1744
1248	$cb->($_[0], Storable::thaw ($data));	1745	eval { $cb->($_[0], Storable::thaw ($data)); 1 }
		1746	or return $_[0]->_error (Errno::EBADMSG);
1249	} else {	1747	} else {
1250	# remove prefix	1748	# remove prefix
1251	substr $_[0]{rbuf}, 0, $format, "";	1749	substr $_[0]{rbuf}, 0, $format, "";
1252		1750
1253	# read remaining chunk	1751	# read remaining chunk
1254	$_[0]->unshift_read (chunk => $len, sub {	1752	$_[0]->unshift_read (chunk => $len, sub {
1255	if (my $ref = eval { Storable::thaw ($_[1]) }) {	1753	eval { $cb->($_[0], Storable::thaw ($_[1])); 1 }
1256	$cb->($_[0], $ref);
1257	} else {
1258	$self->_error (&Errno::EBADMSG);	1754	or $_[0]->_error (Errno::EBADMSG);
1259	}
1260	});	1755	});
1261	}	1756	}
1262		1757
1263	1	1758	1
1264	}	1759	}
1265	};	1760	};
1266		1761
		1762	=item tls_detect => $cb->($handle, $detect, $major, $minor)
		1763
		1764	Checks the input stream for a valid SSL or TLS handshake TLSPaintext
		1765	record without consuming anything. Only SSL version 3 or higher
		1766	is handled, up to the fictituous protocol 4.x (but both SSL3+ and
		1767	SSL2-compatible framing is supported).
		1768
		1769	If it detects that the input data is likely TLS, it calls the callback
		1770	with a true value for C<$detect> and the (on-wire) TLS version as second
		1771	and third argument (C<$major> is C<3>, and C<$minor> is 0..3 for SSL
		1772	3.0, TLS 1.0, 1.1 and 1.2, respectively). If it detects the input to
		1773	be definitely not TLS, it calls the callback with a false value for
		1774	C<$detect>.
		1775
		1776	The callback could use this information to decide whether or not to start
		1777	TLS negotiation.
		1778
		1779	In all cases the data read so far is passed to the following read
		1780	handlers.
		1781
		1782	Usually you want to use the C<tls_autostart> read type instead.
		1783
		1784	If you want to design a protocol that works in the presence of TLS
		1785	dtection, make sure that any non-TLS data doesn't start with the octet 22
		1786	(ASCII SYN, 16 hex) or 128-255 (i.e. highest bit set). The checks this
		1787	read type does are a bit more strict, but might losen in the future to
		1788	accomodate protocol changes.
		1789
		1790	This read type does not rely on L<AnyEvent::TLS> (and thus, not on
		1791	L<Net::SSLeay>).
		1792
		1793	=item tls_autostart => $tls[, $tls_ctx]
		1794
		1795	Tries to detect a valid SSL or TLS handshake. If one is detected, it tries
		1796	to start tls by calling C<starttls> with the given arguments.
		1797
		1798	In practise, C<$tls> must be C<accept>, or a Net::SSLeay context that has
		1799	been configured to accept, as servers do not normally send a handshake on
		1800	their own and ths cannot be detected in this way.
		1801
		1802	See C<tls_detect> above for more details.
		1803
		1804	Example: give the client a chance to start TLS before accepting a text
		1805	line.
		1806
		1807	$hdl->push_read (tls_detect => "accept");
		1808	$hdl->push_read (line => sub {
		1809	print "received ", ($_[0]{tls} ? "encrypted" : "cleartext"), " <$_[1]>\n";
		1810	});
		1811
		1812	=cut
		1813
		1814	register_read_type tls_detect => sub {
		1815	my ($self, $cb) = @_;
		1816
		1817	sub {
		1818	# this regex matches a full or partial tls record
		1819	if (
		1820	# ssl3+: type(22=handshake) major(=3) minor(any) length_hi
		1821	$self->{rbuf} =~ /^(?:\z| \x16 (\z| [\x03\x04] (?:\z| . (?:\z| [\x00-\x40] ))))/xs
		1822	# ssl2 comapatible: len_hi len_lo type(1) major minor dummy(forlength)
		1823	or $self->{rbuf} =~ /^(?:\z| [\x80-\xff] (?:\z| . (?:\z| \x01 (\z| [\x03\x04] (?:\z| . (?:\z| . ))))))/xs
		1824	) {
		1825	return if 3 != length $1; # partial match, can't decide yet
		1826
		1827	# full match, valid TLS record
		1828	my ($major, $minor) = unpack "CC", $1;
		1829	$cb->($self, "accept", $major + $minor * 0.1);
		1830	} else {
		1831	# mismatch == guaranteed not TLS
		1832	$cb->($self, undef);
		1833	}
		1834
		1835	1
		1836	}
		1837	};
		1838
		1839	register_read_type tls_autostart => sub {
		1840	my ($self, @tls) = @_;
		1841
		1842	$RH{tls_detect}($self, sub {
		1843	return unless $_[1];
		1844	$_[0]->starttls (@tls);
		1845	})
		1846	};
		1847
1267	=back	1848	=back
1268		1849
1269	=item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args)	1850	=item custom read types - Package::anyevent_read_type $handle, $cb, @args
1270		1851
1271	This function (not method) lets you add your own types to C<push_read>.	1852	Instead of one of the predefined types, you can also specify the name
		1853	of a package. AnyEvent will try to load the package and then expects to
		1854	find a function named C<anyevent_read_type> inside. If it isn't found, it
		1855	progressively tries to load the parent package until it either finds the
		1856	function (good) or runs out of packages (bad).
1272		1857
1273	Whenever the given C<type> is used, C<push_read> will invoke the code	1858	Whenever this type is used, C<push_read> will invoke the function with the
1274	reference with the handle object, the callback and the remaining	1859	handle object, the original callback and the remaining arguments.
1275	arguments.
1276		1860
1277	The code reference is supposed to return a callback (usually a closure)	1861	The function is supposed to return a callback (usually a closure) that
1278	that works as a plain read callback (see C<< ->push_read ($cb) >>).	1862	works as a plain read callback (see C<< ->push_read ($cb) >>), so you can
		1863	mentally treat the function as a "configurable read type to read callback"
		1864	converter.
1279		1865
1280	It should invoke the passed callback when it is done reading (remember to	1866	It should invoke the original callback when it is done reading (remember
1281	pass C<$handle> as first argument as all other callbacks do that).	1867	to pass C<$handle> as first argument as all other callbacks do that,
		1868	although there is no strict requirement on this).
1282		1869
1283	Note that this is a function, and all types registered this way will be
1284	global, so try to use unique names.
1285
1286	For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>,	1870	For examples, see the source of this module (F<perldoc -m
1287	search for C<register_read_type>)).	1871	AnyEvent::Handle>, search for C<register_read_type>)).
1288		1872
1289	=item $handle->stop_read	1873	=item $handle->stop_read
1290		1874
1291	=item $handle->start_read	1875	=item $handle->start_read
1292		1876
…		…
1298	Note that AnyEvent::Handle will automatically C<start_read> for you when	1882	Note that AnyEvent::Handle will automatically C<start_read> for you when
1299	you change the C<on_read> callback or push/unshift a read callback, and it	1883	you change the C<on_read> callback or push/unshift a read callback, and it
1300	will automatically C<stop_read> for you when neither C<on_read> is set nor	1884	will automatically C<stop_read> for you when neither C<on_read> is set nor
1301	there are any read requests in the queue.	1885	there are any read requests in the queue.
1302		1886
1303	These methods will have no effect when in TLS mode (as TLS doesn't support	1887	In older versions of this module (<= 5.3), these methods had no effect,
1304	half-duplex connections).	1888	as TLS does not support half-duplex connections. In current versions they
		1889	work as expected, as this behaviour is required to avoid certain resource
		1890	attacks, where the program would be forced to read (and buffer) arbitrary
		1891	amounts of data before being able to send some data. The drawback is that
		1892	some readings of the the SSL/TLS specifications basically require this
		1893	attack to be working, as SSL/TLS implementations might stall sending data
		1894	during a rehandshake.
		1895
		1896	As a guideline, during the initial handshake, you should not stop reading,
		1897	and as a client, it might cause problems, depending on your application.
1305		1898
1306	=cut	1899	=cut
1307		1900
1308	sub stop_read {	1901	sub stop_read {
1309	my ($self) = @_;	1902	my ($self) = @_;
1310		1903
1311	delete $self->{_rw} unless $self->{tls};	1904	delete $self->{_rw};
1312	}	1905	}
1313		1906
1314	sub start_read {	1907	sub start_read {
1315	my ($self) = @_;	1908	my ($self) = @_;
1316		1909
1317	unless ($self->{_rw} || $self->{_eof}) {	1910	unless ($self->{_rw} || $self->{_eof} || !$self->{fh}) {
1318	Scalar::Util::weaken $self;	1911	Scalar::Util::weaken $self;
1319		1912
1320	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1913	$self->{_rw} = AE::io $self->{fh}, 0, sub {
1321	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});	1914	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1322	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;	1915	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size}, length $$rbuf;
1323		1916
1324	if ($len > 0) {	1917	if ($len > 0) {
1325	$self->{_activity} = AnyEvent->now;	1918	$self->{_activity} = $self->{_ractivity} = AE::now;
1326		1919
1327	if ($self->{tls}) {	1920	if ($self->{tls}) {
1328	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);	1921	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1329		1922
1330	&_dotls ($self);	1923	&_dotls ($self);
1331	} else {	1924	} else {
1332	$self->_drain_rbuf unless $self->{_in_drain};	1925	$self->_drain_rbuf;
		1926	}
		1927
		1928	if ($len == $self->{read_size}) {
		1929	$self->{read_size} *= 2;
		1930	$self->{read_size} = $self->{max_read_size} || MAX_READ_SIZE
		1931	if $self->{read_size} > ($self->{max_read_size} || MAX_READ_SIZE);
1333	}	1932	}
1334		1933
1335	} elsif (defined $len) {	1934	} elsif (defined $len) {
1336	delete $self->{_rw};	1935	delete $self->{_rw};
1337	$self->{_eof} = 1;	1936	$self->{_eof} = 1;
1338	$self->_drain_rbuf unless $self->{_in_drain};	1937	$self->_drain_rbuf;
1339		1938
1340	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	1939	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
1341	return $self->_error ($!, 1);	1940	return $self->_error ($!, 1);
1342	}	1941	}
1343	});	1942	};
		1943	}
		1944	}
		1945
		1946	our $ERROR_SYSCALL;
		1947	our $ERROR_WANT_READ;
		1948
		1949	sub _tls_error {
		1950	my ($self, $err) = @_;
		1951
		1952	return $self->_error ($!, 1)
		1953	if $err == Net::SSLeay::ERROR_SYSCALL ();
		1954
		1955	my $err = Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ());
		1956
		1957	# reduce error string to look less scary
		1958	$err =~ s/^error:[0-9a-fA-F]{8}:[^:]+:([^:]+):/\L$1: /;
		1959
		1960	if ($self->{_on_starttls}) {
		1961	(delete $self->{_on_starttls})->($self, undef, $err);
		1962	&_freetls;
		1963	} else {
		1964	&_freetls;
		1965	$self->_error (Errno::EPROTO, 1, $err);
1344	}	1966	}
1345	}	1967	}
1346		1968
1347	# poll the write BIO and send the data if applicable	1969	# poll the write BIO and send the data if applicable
		1970	# also decode read data if possible
		1971	# this is basiclaly our TLS state machine
		1972	# more efficient implementations are possible with openssl,
		1973	# but not with the buggy and incomplete Net::SSLeay.
1348	sub _dotls {	1974	sub _dotls {
1349	my ($self) = @_;	1975	my ($self) = @_;
1350		1976
1351	my $tmp;	1977	my $tmp;
1352		1978
1353	if (length $self->{_tls_wbuf}) {	1979	if (length $self->{_tls_wbuf}) {
1354	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1980	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1355	substr $self->{_tls_wbuf}, 0, $tmp, "";	1981	substr $self->{_tls_wbuf}, 0, $tmp, "";
1356	}	1982	}
		1983
		1984	$tmp = Net::SSLeay::get_error ($self->{tls}, $tmp);
		1985	return $self->_tls_error ($tmp)
		1986	if $tmp != $ERROR_WANT_READ
		1987	&& ($tmp != $ERROR_SYSCALL || $!);
1357	}	1988	}
1358		1989
1359	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {	1990	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
1360	unless (length $tmp) {	1991	unless (length $tmp) {
1361	# let's treat SSL-eof as we treat normal EOF	1992	$self->{_on_starttls}
1362	delete $self->{_rw};	1993	and (delete $self->{_on_starttls})->($self, undef, "EOF during handshake"); # ???
1363	$self->{_eof} = 1;
1364	&_freetls;	1994	&_freetls;
		1995
		1996	if ($self->{on_stoptls}) {
		1997	$self->{on_stoptls}($self);
		1998	return;
		1999	} else {
		2000	# let's treat SSL-eof as we treat normal EOF
		2001	delete $self->{_rw};
		2002	$self->{_eof} = 1;
		2003	}
1365	}	2004	}
1366		2005
1367	$self->{_tls_rbuf} .= $tmp;	2006	$self->{_tls_rbuf} .= $tmp;
1368	$self->_drain_rbuf unless $self->{_in_drain};	2007	$self->_drain_rbuf;
1369	$self->{tls} or return; # tls session might have gone away in callback	2008	$self->{tls} or return; # tls session might have gone away in callback
1370	}	2009	}
1371		2010
1372	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);	2011	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
1373
1374	if ($tmp != Net::SSLeay::ERROR_WANT_READ ()) {
1375	if ($tmp == Net::SSLeay::ERROR_SYSCALL ()) {
1376	return $self->_error ($!, 1);	2012	return $self->_tls_error ($tmp)
1377	} elsif ($tmp == Net::SSLeay::ERROR_SSL ()) {	2013	if $tmp != $ERROR_WANT_READ
1378	return $self->_error (&Errno::EIO, 1);	2014	&& ($tmp != $ERROR_SYSCALL || $!);
1379	}
1380
1381	# all other errors are fine for our purposes
1382	}
1383		2015
1384	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {	2016	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1385	$self->{wbuf} .= $tmp;	2017	$self->{wbuf} .= $tmp;
1386	$self->_drain_wbuf;	2018	$self->_drain_wbuf;
		2019	$self->{tls} or return; # tls session might have gone away in callback
1387	}	2020	}
		2021
		2022	$self->{_on_starttls}
		2023	and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK ()
		2024	and (delete $self->{_on_starttls})->($self, 1, "TLS/SSL connection established");
1388	}	2025	}
1389		2026
1390	=item $handle->starttls ($tls[, $tls_ctx])	2027	=item $handle->starttls ($tls[, $tls_ctx])
1391		2028
1392	Instead of starting TLS negotiation immediately when the AnyEvent::Handle	2029	Instead of starting TLS negotiation immediately when the AnyEvent::Handle
1393	object is created, you can also do that at a later time by calling	2030	object is created, you can also do that at a later time by calling
1394	C<starttls>.	2031	C<starttls>. See the C<tls> constructor argument for general info.
		2032
		2033	Starting TLS is currently an asynchronous operation - when you push some
		2034	write data and then call C<< ->starttls >> then TLS negotiation will start
		2035	immediately, after which the queued write data is then sent. This might
		2036	change in future versions, so best make sure you have no outstanding write
		2037	data when calling this method.
1395		2038
1396	The first argument is the same as the C<tls> constructor argument (either	2039	The first argument is the same as the C<tls> constructor argument (either
1397	C<"connect">, C<"accept"> or an existing Net::SSLeay object).	2040	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
1398		2041
1399	The second argument is the optional C<AnyEvent::TLS> object that is used	2042	The second argument is the optional C<AnyEvent::TLS> object that is used
…		…
1404	The TLS connection object will end up in C<< $handle->{tls} >>, the TLS	2047	The TLS connection object will end up in C<< $handle->{tls} >>, the TLS
1405	context in C<< $handle->{tls_ctx} >> after this call and can be used or	2048	context in C<< $handle->{tls_ctx} >> after this call and can be used or
1406	changed to your liking. Note that the handshake might have already started	2049	changed to your liking. Note that the handshake might have already started
1407	when this function returns.	2050	when this function returns.
1408		2051
1409	If it an error to start a TLS handshake more than once per	2052	Due to bugs in OpenSSL, it might or might not be possible to do multiple
1410	AnyEvent::Handle object (this is due to bugs in OpenSSL).	2053	handshakes on the same stream. It is best to not attempt to use the
		2054	stream after stopping TLS.
1411		2055
		2056	This method may invoke callbacks (and therefore the handle might be
		2057	destroyed after it returns).
		2058
1412	=cut	2059	=cut
		2060
		2061	our %TLS_CACHE; #TODO not yet documented, should we?
1413		2062
1414	sub starttls {	2063	sub starttls {
1415	my ($self, $ssl, $ctx) = @_;	2064	my ($self, $tls, $ctx) = @_;
1416		2065
1417	require Net::SSLeay;	2066	Carp::croak "It is an error to call starttls on an AnyEvent::Handle object while TLS is already active, caught"
1418
1419	Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object"
1420	if $self->{tls};	2067	if $self->{tls};
1421		2068
		2069	unless (defined $AnyEvent::TLS::VERSION) {
		2070	eval {
		2071	require Net::SSLeay;
		2072	require AnyEvent::TLS;
		2073	1
		2074	} or return $self->_error (Errno::EPROTO, 1, "TLS support not available on this system");
		2075	}
		2076
		2077	$self->{tls} = $tls;
		2078	$self->{tls_ctx} = $ctx if @_ > 2;
		2079
		2080	return unless $self->{fh};
		2081
		2082	$ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL ();
		2083	$ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ ();
		2084
		2085	$tls = delete $self->{tls};
1422	$ctx ||= $self->{tls_ctx};	2086	$ctx = $self->{tls_ctx};
		2087
		2088	local $Carp::CarpLevel = 1; # skip ourselves when creating a new context or session
1423		2089
1424	if ("HASH" eq ref $ctx) {	2090	if ("HASH" eq ref $ctx) {
1425	require AnyEvent::TLS;	2091	if ($ctx->{cache}) {
1426		2092	my $key = $ctx+0;
1427	local $Carp::CarpLevel = 1; # skip ourselves when creating a new context	2093	$ctx = $TLS_CACHE{$key} ||= new AnyEvent::TLS %$ctx;
		2094	} else {
1428	$ctx = new AnyEvent::TLS %$ctx;	2095	$ctx = new AnyEvent::TLS %$ctx;
		2096	}
1429	}	2097	}
1430		2098
1431	$self->{tls_ctx} = $ctx || TLS_CTX ();	2099	$self->{tls_ctx} = $ctx || TLS_CTX ();
1432	$self->{tls} = $ssl = $self->{tls_ctx}->_get_session ($ssl, $self);	2100	$self->{tls} = $tls = $self->{tls_ctx}->_get_session ($tls, $self, $self->{peername});
1433		2101
1434	# basically, this is deep magic (because SSL_read should have the same issues)	2102	# basically, this is deep magic (because SSL_read should have the same issues)
1435	# but the openssl maintainers basically said: "trust us, it just works".	2103	# but the openssl maintainers basically said: "trust us, it just works".
1436	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	2104	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1437	# and mismaintained ssleay-module doesn't even offer them).	2105	# and mismaintained ssleay-module doesn't even offer them).
…		…
1444	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to	2112	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
1445	# have identity issues in that area.	2113	# have identity issues in that area.
1446	# Net::SSLeay::CTX_set_mode ($ssl,	2114	# Net::SSLeay::CTX_set_mode ($ssl,
1447	# (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)	2115	# (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)
1448	# | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));	2116	# | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));
1449	Net::SSLeay::CTX_set_mode ($ssl, 1|2);	2117	Net::SSLeay::CTX_set_mode ($tls, 1|2);
1450		2118
1451	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	2119	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1452	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	2120	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1453		2121
		2122	Net::SSLeay::BIO_write ($self->{_rbio}, $self->{rbuf});
		2123	$self->{rbuf} = "";
		2124
1454	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	2125	Net::SSLeay::set_bio ($tls, $self->{_rbio}, $self->{_wbio});
		2126
		2127	$self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) }
		2128	if $self->{on_starttls};
1455		2129
1456	&_dotls; # need to trigger the initial handshake	2130	&_dotls; # need to trigger the initial handshake
1457	$self->start_read; # make sure we actually do read	2131	$self->start_read; # make sure we actually do read
1458	}	2132	}
1459		2133
1460	=item $handle->stoptls	2134	=item $handle->stoptls
1461		2135
1462	Shuts down the SSL connection - this makes a proper EOF handshake by	2136	Shuts down the SSL connection - this makes a proper EOF handshake by
1463	sending a close notify to the other side, but since OpenSSL doesn't	2137	sending a close notify to the other side, but since OpenSSL doesn't
1464	support non-blocking shut downs, it is not possible to re-use the stream	2138	support non-blocking shut downs, it is not guaranteed that you can re-use
1465	afterwards.	2139	the stream afterwards.
		2140
		2141	This method may invoke callbacks (and therefore the handle might be
		2142	destroyed after it returns).
1466		2143
1467	=cut	2144	=cut
1468		2145
1469	sub stoptls {	2146	sub stoptls {
1470	my ($self) = @_;	2147	my ($self) = @_;
1471		2148
1472	if ($self->{tls}) {	2149	if ($self->{tls} && $self->{fh}) {
1473	Net::SSLeay::shutdown ($self->{tls});	2150	Net::SSLeay::shutdown ($self->{tls});
1474		2151
1475	&_dotls;	2152	&_dotls;
1476		2153
1477	# we don't give a shit. no, we do, but we can't. no...	2154	# # we don't give a shit. no, we do, but we can't. no...#d#
1478	# we, we... have to use openssl :/	2155	# # we, we... have to use openssl :/#d#
1479	&_freetls;	2156	# &_freetls;#d#
1480	}	2157	}
1481	}	2158	}
1482		2159
1483	sub _freetls {	2160	sub _freetls {
1484	my ($self) = @_;	2161	my ($self) = @_;
1485		2162
1486	return unless $self->{tls};	2163	return unless $self->{tls};
1487		2164
1488	$self->{tls_ctx}->_put_session (delete $self->{tls});	2165	$self->{tls_ctx}->_put_session (delete $self->{tls})
		2166	if $self->{tls} > 0;
1489		2167
1490	delete @$self{qw(_rbio _wbio _tls_wbuf)};	2168	delete @$self{qw(_rbio _wbio _tls_wbuf _on_starttls)};
1491	}	2169	}
		2170
		2171	=item $handle->resettls
		2172
		2173	This rarely-used method simply resets and TLS state on the handle, usually
		2174	causing data loss.
		2175
		2176	One case where it may be useful is when you want to skip over the data in
		2177	the stream but you are not interested in interpreting it, so data loss is
		2178	no concern.
		2179
		2180	=cut
		2181
		2182	*resettls = \&_freetls;
1492		2183
1493	sub DESTROY {	2184	sub DESTROY {
1494	my ($self) = @_;	2185	my ($self) = @_;
1495		2186
1496	&_freetls;	2187	&_freetls;
1497		2188
1498	my $linger = exists $self->{linger} ? $self->{linger} : 3600;	2189	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
1499		2190
1500	if ($linger && length $self->{wbuf}) {	2191	if ($linger && length $self->{wbuf} && $self->{fh}) {
1501	my $fh = delete $self->{fh};	2192	my $fh = delete $self->{fh};
1502	my $wbuf = delete $self->{wbuf};	2193	my $wbuf = delete $self->{wbuf};
1503		2194
1504	my @linger;	2195	my @linger;
1505		2196
1506	push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub {	2197	push @linger, AE::io $fh, 1, sub {
1507	my $len = syswrite $fh, $wbuf, length $wbuf;	2198	my $len = syswrite $fh, $wbuf, length $wbuf;
1508		2199
1509	if ($len > 0) {	2200	if ($len > 0) {
1510	substr $wbuf, 0, $len, "";	2201	substr $wbuf, 0, $len, "";
1511	} else {	2202	} elsif (defined $len || ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK)) {
1512	@linger = (); # end	2203	@linger = (); # end
1513	}	2204	}
1514	});	2205	};
1515	push @linger, AnyEvent->timer (after => $linger, cb => sub {	2206	push @linger, AE::timer $linger, 0, sub {
1516	@linger = ();	2207	@linger = ();
1517	});	2208	};
1518	}	2209	}
1519	}	2210	}
1520		2211
1521	=item $handle->destroy	2212	=item $handle->destroy
1522		2213
1523	Shuts down the handle object as much as possible - this call ensures that	2214	Shuts down the handle object as much as possible - this call ensures that
1524	no further callbacks will be invoked and resources will be freed as much	2215	no further callbacks will be invoked and as many resources as possible
1525	as possible. You must not call any methods on the object afterwards.	2216	will be freed. Any method you will call on the handle object after
		2217	destroying it in this way will be silently ignored (and it will return the
		2218	empty list).
1526		2219
1527	Normally, you can just "forget" any references to an AnyEvent::Handle	2220	Normally, you can just "forget" any references to an AnyEvent::Handle
1528	object and it will simply shut down. This works in fatal error and EOF	2221	object and it will simply shut down. This works in fatal error and EOF
1529	callbacks, as well as code outside. It does I<NOT> work in a read or write	2222	callbacks, as well as code outside. It does I<NOT> work in a read or write
1530	callback, so when you want to destroy the AnyEvent::Handle object from	2223	callback, so when you want to destroy the AnyEvent::Handle object from
1531	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in	2224	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
1532	that case.	2225	that case.
1533		2226
		2227	Destroying the handle object in this way has the advantage that callbacks
		2228	will be removed as well, so if those are the only reference holders (as
		2229	is common), then one doesn't need to do anything special to break any
		2230	reference cycles.
		2231
1534	The handle might still linger in the background and write out remaining	2232	The handle might still linger in the background and write out remaining
1535	data, as specified by the C<linger> option, however.	2233	data, as specified by the C<linger> option, however.
1536		2234
1537	=cut	2235	=cut
1538		2236
1539	sub destroy {	2237	sub destroy {
1540	my ($self) = @_;	2238	my ($self) = @_;
1541		2239
1542	$self->DESTROY;	2240	$self->DESTROY;
1543	%$self = ();	2241	%$self = ();
		2242	bless $self, "AnyEvent::Handle::destroyed";
1544	}	2243	}
		2244
		2245	sub AnyEvent::Handle::destroyed::AUTOLOAD {
		2246	#nop
		2247	}
		2248
		2249	=item $handle->destroyed
		2250
		2251	Returns false as long as the handle hasn't been destroyed by a call to C<<
		2252	->destroy >>, true otherwise.
		2253
		2254	Can be useful to decide whether the handle is still valid after some
		2255	callback possibly destroyed the handle. For example, C<< ->push_write >>,
		2256	C<< ->starttls >> and other methods can call user callbacks, which in turn
		2257	can destroy the handle, so work can be avoided by checking sometimes:
		2258
		2259	$hdl->starttls ("accept");
		2260	return if $hdl->destroyed;
		2261	$hdl->push_write (...
		2262
		2263	Note that the call to C<push_write> will silently be ignored if the handle
		2264	has been destroyed, so often you can just ignore the possibility of the
		2265	handle being destroyed.
		2266
		2267	=cut
		2268
		2269	sub destroyed { 0 }
		2270	sub AnyEvent::Handle::destroyed::destroyed { 1 }
1545		2271
1546	=item AnyEvent::Handle::TLS_CTX	2272	=item AnyEvent::Handle::TLS_CTX
1547		2273
1548	This function creates and returns the AnyEvent::TLS object used by default	2274	This function creates and returns the AnyEvent::TLS object used by default
1549	for TLS mode.	2275	for TLS mode.
…		…
1577		2303
1578	It is only safe to "forget" the reference inside EOF or error callbacks,	2304	It is only safe to "forget" the reference inside EOF or error callbacks,
1579	from within all other callbacks, you need to explicitly call the C<<	2305	from within all other callbacks, you need to explicitly call the C<<
1580	->destroy >> method.	2306	->destroy >> method.
1581		2307
		2308	=item Why is my C<on_eof> callback never called?
		2309
		2310	Probably because your C<on_error> callback is being called instead: When
		2311	you have outstanding requests in your read queue, then an EOF is
		2312	considered an error as you clearly expected some data.
		2313
		2314	To avoid this, make sure you have an empty read queue whenever your handle
		2315	is supposed to be "idle" (i.e. connection closes are O.K.). You can set
		2316	an C<on_read> handler that simply pushes the first read requests in the
		2317	queue.
		2318
		2319	See also the next question, which explains this in a bit more detail.
		2320
		2321	=item How can I serve requests in a loop?
		2322
		2323	Most protocols consist of some setup phase (authentication for example)
		2324	followed by a request handling phase, where the server waits for requests
		2325	and handles them, in a loop.
		2326
		2327	There are two important variants: The first (traditional, better) variant
		2328	handles requests until the server gets some QUIT command, causing it to
		2329	close the connection first (highly desirable for a busy TCP server). A
		2330	client dropping the connection is an error, which means this variant can
		2331	detect an unexpected detection close.
		2332
		2333	To handle this case, always make sure you have a non-empty read queue, by
		2334	pushing the "read request start" handler on it:
		2335
		2336	# we assume a request starts with a single line
		2337	my @start_request; @start_request = (line => sub {
		2338	my ($hdl, $line) = @_;
		2339
		2340	... handle request
		2341
		2342	# push next request read, possibly from a nested callback
		2343	$hdl->push_read (@start_request);
		2344	});
		2345
		2346	# auth done, now go into request handling loop
		2347	# now push the first @start_request
		2348	$hdl->push_read (@start_request);
		2349
		2350	By always having an outstanding C<push_read>, the handle always expects
		2351	some data and raises the C<EPIPE> error when the connction is dropped
		2352	unexpectedly.
		2353
		2354	The second variant is a protocol where the client can drop the connection
		2355	at any time. For TCP, this means that the server machine may run out of
		2356	sockets easier, and in general, it means you cannot distinguish a protocl
		2357	failure/client crash from a normal connection close. Nevertheless, these
		2358	kinds of protocols are common (and sometimes even the best solution to the
		2359	problem).
		2360
		2361	Having an outstanding read request at all times is possible if you ignore
		2362	C<EPIPE> errors, but this doesn't help with when the client drops the
		2363	connection during a request, which would still be an error.
		2364
		2365	A better solution is to push the initial request read in an C<on_read>
		2366	callback. This avoids an error, as when the server doesn't expect data
		2367	(i.e. is idly waiting for the next request, an EOF will not raise an
		2368	error, but simply result in an C<on_eof> callback. It is also a bit slower
		2369	and simpler:
		2370
		2371	# auth done, now go into request handling loop
		2372	$hdl->on_read (sub {
		2373	my ($hdl) = @_;
		2374
		2375	# called each time we receive data but the read queue is empty
		2376	# simply start read the request
		2377
		2378	$hdl->push_read (line => sub {
		2379	my ($hdl, $line) = @_;
		2380
		2381	... handle request
		2382
		2383	# do nothing special when the request has been handled, just
		2384	# let the request queue go empty.
		2385	});
		2386	});
		2387
1582	=item I get different callback invocations in TLS mode/Why can't I pause	2388	=item I get different callback invocations in TLS mode/Why can't I pause
1583	reading?	2389	reading?
1584		2390
1585	Unlike, say, TCP, TLS connections do not consist of two independent	2391	Unlike, say, TCP, TLS connections do not consist of two independent
1586	communication channels, one for each direction. Or put differently. The	2392	communication channels, one for each direction. Or put differently, the
1587	read and write directions are not independent of each other: you cannot	2393	read and write directions are not independent of each other: you cannot
1588	write data unless you are also prepared to read, and vice versa.	2394	write data unless you are also prepared to read, and vice versa.
1589		2395
1590	This can mean than, in TLS mode, you might get C<on_error> or C<on_eof>	2396	This means that, in TLS mode, you might get C<on_error> or C<on_eof>
1591	callback invocations when you are not expecting any read data - the reason	2397	callback invocations when you are not expecting any read data - the reason
1592	is that AnyEvent::Handle always reads in TLS mode.	2398	is that AnyEvent::Handle always reads in TLS mode.
1593		2399
1594	During the connection, you have to make sure that you always have a	2400	During the connection, you have to make sure that you always have a
1595	non-empty read-queue, or an C<on_read> watcher. At the end of the	2401	non-empty read-queue, or an C<on_read> watcher. At the end of the
…		…
1605		2411
1606	$handle->on_read (sub { });	2412	$handle->on_read (sub { });
1607	$handle->on_eof (undef);	2413	$handle->on_eof (undef);
1608	$handle->on_error (sub {	2414	$handle->on_error (sub {
1609	my $data = delete $_[0]{rbuf};	2415	my $data = delete $_[0]{rbuf};
1610	undef $handle;
1611	});	2416	});
		2417
		2418	Note that this example removes the C<rbuf> member from the handle object,
		2419	which is not normally allowed by the API. It is expressly permitted in
		2420	this case only, as the handle object needs to be destroyed afterwards.
1612		2421
1613	The reason to use C<on_error> is that TCP connections, due to latencies	2422	The reason to use C<on_error> is that TCP connections, due to latencies
1614	and packets loss, might get closed quite violently with an error, when in	2423	and packets loss, might get closed quite violently with an error, when in
1615	fact, all data has been received.	2424	fact all data has been received.
1616		2425
1617	It is usually better to use acknowledgements when transferring data,	2426	It is usually better to use acknowledgements when transferring data,
1618	to make sure the other side hasn't just died and you got the data	2427	to make sure the other side hasn't just died and you got the data
1619	intact. This is also one reason why so many internet protocols have an	2428	intact. This is also one reason why so many internet protocols have an
1620	explicit QUIT command.	2429	explicit QUIT command.
…		…
1627	C<low_water_mark> this will be called precisely when all data has been	2436	C<low_water_mark> this will be called precisely when all data has been
1628	written to the socket:	2437	written to the socket:
1629		2438
1630	$handle->push_write (...);	2439	$handle->push_write (...);
1631	$handle->on_drain (sub {	2440	$handle->on_drain (sub {
1632	warn "all data submitted to the kernel\n";	2441	AE::log debug => "All data submitted to the kernel.";
1633	undef $handle;	2442	undef $handle;
1634	});	2443	});
1635		2444
		2445	If you just want to queue some data and then signal EOF to the other side,
		2446	consider using C<< ->push_shutdown >> instead.
		2447
		2448	=item I want to contact a TLS/SSL server, I don't care about security.
		2449
		2450	If your TLS server is a pure TLS server (e.g. HTTPS) that only speaks TLS,
		2451	connect to it and then create the AnyEvent::Handle with the C<tls>
		2452	parameter:
		2453
		2454	tcp_connect $host, $port, sub {
		2455	my ($fh) = @_;
		2456
		2457	my $handle = new AnyEvent::Handle
		2458	fh => $fh,
		2459	tls => "connect",
		2460	on_error => sub { ... };
		2461
		2462	$handle->push_write (...);
		2463	};
		2464
		2465	=item I want to contact a TLS/SSL server, I do care about security.
		2466
		2467	Then you should additionally enable certificate verification, including
		2468	peername verification, if the protocol you use supports it (see
		2469	L<AnyEvent::TLS>, C<verify_peername>).
		2470
		2471	E.g. for HTTPS:
		2472
		2473	tcp_connect $host, $port, sub {
		2474	my ($fh) = @_;
		2475
		2476	my $handle = new AnyEvent::Handle
		2477	fh => $fh,
		2478	peername => $host,
		2479	tls => "connect",
		2480	tls_ctx => { verify => 1, verify_peername => "https" },
		2481	...
		2482
		2483	Note that you must specify the hostname you connected to (or whatever
		2484	"peername" the protocol needs) as the C<peername> argument, otherwise no
		2485	peername verification will be done.
		2486
		2487	The above will use the system-dependent default set of trusted CA
		2488	certificates. If you want to check against a specific CA, add the
		2489	C<ca_file> (or C<ca_cert>) arguments to C<tls_ctx>:
		2490
		2491	tls_ctx => {
		2492	verify => 1,
		2493	verify_peername => "https",
		2494	ca_file => "my-ca-cert.pem",
		2495	},
		2496
		2497	=item I want to create a TLS/SSL server, how do I do that?
		2498
		2499	Well, you first need to get a server certificate and key. You have
		2500	three options: a) ask a CA (buy one, use cacert.org etc.) b) create a
		2501	self-signed certificate (cheap. check the search engine of your choice,
		2502	there are many tutorials on the net) or c) make your own CA (tinyca2 is a
		2503	nice program for that purpose).
		2504
		2505	Then create a file with your private key (in PEM format, see
		2506	L<AnyEvent::TLS>), followed by the certificate (also in PEM format). The
		2507	file should then look like this:
		2508
		2509	-----BEGIN RSA PRIVATE KEY-----
		2510	...header data
		2511	... lots of base64'y-stuff
		2512	-----END RSA PRIVATE KEY-----
		2513
		2514	-----BEGIN CERTIFICATE-----
		2515	... lots of base64'y-stuff
		2516	-----END CERTIFICATE-----
		2517
		2518	The important bits are the "PRIVATE KEY" and "CERTIFICATE" parts. Then
		2519	specify this file as C<cert_file>:
		2520
		2521	tcp_server undef, $port, sub {
		2522	my ($fh) = @_;
		2523
		2524	my $handle = new AnyEvent::Handle
		2525	fh => $fh,
		2526	tls => "accept",
		2527	tls_ctx => { cert_file => "my-server-keycert.pem" },
		2528	...
		2529
		2530	When you have intermediate CA certificates that your clients might not
		2531	know about, just append them to the C<cert_file>.
		2532
1636	=back	2533	=back
1637
1638		2534
1639	=head1 SUBCLASSING AnyEvent::Handle	2535	=head1 SUBCLASSING AnyEvent::Handle
1640		2536
1641	In many cases, you might want to subclass AnyEvent::Handle.	2537	In many cases, you might want to subclass AnyEvent::Handle.
1642		2538
…		…
1659		2555
1660	=item * all members not documented here and not prefixed with an underscore	2556	=item * all members not documented here and not prefixed with an underscore
1661	are free to use in subclasses.	2557	are free to use in subclasses.
1662		2558
1663	Of course, new versions of AnyEvent::Handle may introduce more "public"	2559	Of course, new versions of AnyEvent::Handle may introduce more "public"
1664	member variables, but thats just life, at least it is documented.	2560	member variables, but that's just life. At least it is documented.
1665		2561
1666	=back	2562	=back
1667		2563
1668	=head1 AUTHOR	2564	=head1 AUTHOR
1669		2565
1670	Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>.	2566	Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>.
1671		2567
1672	=cut	2568	=cut
1673		2569
1674	1; # End of AnyEvent::Handle	2570	1
		2571

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