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Revision 1.238 by root, Tue Dec 10 15:54:51 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, $message)
101
102	This is the error callback, which is called when, well, some error
103	occured, such as not being able to resolve the hostname, failure to
104	connect or a read error.
105
106	Some errors are fatal (which is indicated by C<$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	AnyEvent::Handle tries to find an appropriate error code for you to check
113	against, but in some cases (TLS errors), this does not work well. It is
114	recommended to always output the C<$message> argument in human-readable
115	error messages (it's usually the same as C<"$!">).
116
117	Non-fatal errors can be retried by simply returning, but it is recommended
118	to simply ignore this parameter and instead abondon the handle object
119	when this callback is invoked. Examples of non-fatal errors are timeouts
120	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
121
122	On callback entrance, the value of C<$!> contains the operating system
123	error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or
124	C<EPROTO>).
125
126	While not mandatory, it is I<highly> recommended to set this callback, as
127	you will not be notified of errors otherwise. The default simply calls
128	C<croak>.
129
130	=item on_read => $cb->($handle)
131
132	This sets the default read callback, which is called when data arrives
133	and no read request is in the queue (unlike read queue callbacks, this
134	callback will only be called when at least one octet of data is in the
135	read buffer).
136
137	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
138	method or access the C<$handle->{rbuf}> member directly. Note that you
139	must not enlarge or modify the read buffer, you can only remove data at
140	the beginning from it.
141
142	When an EOF condition is detected then AnyEvent::Handle will first try to
143	feed all the remaining data to the queued callbacks and C<on_read> before
144	calling the C<on_eof> callback. If no progress can be made, then a fatal
145	error will be raised (with C<$!> set to C<EPIPE>).
146
147	=item on_drain => $cb->($handle)	239	=item on_drain => $cb->($handle)
148		240
149	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
150	(or when the callback is set and the buffer is empty already).	242	empty (and immediately when the handle object is created).
151		243
152	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.
153		245
154	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
155	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
…		…
157	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
158	the file when the write queue becomes empty.	250	the file when the write queue becomes empty.
159		251
160	=item timeout => $fractional_seconds	252	=item timeout => $fractional_seconds
161		253
		254	=item rtimeout => $fractional_seconds
		255
		256	=item wtimeout => $fractional_seconds
		257
162	If non-zero, then this enables an "inactivity" timeout: whenever this many	258	If non-zero, then these enables an "inactivity" timeout: whenever this
163	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
164	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
165	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).
166		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
167	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
168	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
169	idle then you should disable the timout temporarily or ignore the timeout	273	idle then you should disable the timeout temporarily or ignore the
170	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
171	restart the timeout.	275	AnyEvent::Handle will simply restart the timeout.
172		276
173	Zero (the default) disables this timeout.	277	Zero (the default) disables the corresponding timeout.
174		278
175	=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)
176		284
177	Called whenever the inactivity timeout passes. If you return from this	285	Called whenever the inactivity timeout passes. If you return from this
178	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,
179	so this condition is not fatal in any way.	287	so this condition is not fatal in any way.
180		288
…		…
188	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
189	(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
190	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
191	isn't finished).	299	isn't finished).
192		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
193	=item autocork => <boolean>	316	=item autocork => <boolean>
194		317
195	When disabled (the default), then C<push_write> will try to immediately	318	When disabled (the default), C<push_write> will try to immediately
196	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
197	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
198	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
199	disadvantage is usually avoided by your kernel's nagle algorithm, see	322	disadvantage is usually avoided by your kernel's nagle algorithm, see
200	C<no_delay>, but this option can save costly syscalls).	323	C<no_delay>, but this option can save costly syscalls).
201		324
202	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
203	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,
204	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
205	the write buffer often is full). It also increases write latency.	328	the write buffer often is full). It also increases write latency.
206		329
207	=item no_delay => <boolean>	330	=item no_delay => <boolean>
…		…
211	the Nagle algorithm, and usually it is beneficial.	334	the Nagle algorithm, and usually it is beneficial.
212		335
213	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
214	accomplishd by setting this option to a true value.	337	accomplishd by setting this option to a true value.
215		338
216	The default is your opertaing system's default behaviour (most likely	339	The default is your operating system's default behaviour (most likely
217	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.
218		373
219	=item read_size => <bytes>	374	=item read_size => <bytes>
220		375
221	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
222	try to read during each loop iteration, which affects memory	377	to read during each loop iteration. Each handle object will consume
223	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.
224		388
225	=item low_water_mark => <bytes>	389	=item low_water_mark => <bytes>
226		390
227	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
228	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
229	considered empty.	393	considered empty.
230		394
231	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
232	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
233	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
234	is good in almost all cases.	398	is good in almost all cases.
235		399
236	=item linger => <seconds>	400	=item linger => <seconds>
237		401
238	If non-zero (default: C<3600>), then the destructor of the	402	If this is non-zero (default: C<3600>), the destructor of the
239	AnyEvent::Handle object will check whether there is still outstanding	403	AnyEvent::Handle object will check whether there is still outstanding
240	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
241	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
242	system treats outstanding data at socket close time).	406	system treats outstanding data at socket close time).
243		407
…		…
249		413
250	A string used to identify the remote site - usually the DNS hostname	414	A string used to identify the remote site - usually the DNS hostname
251	(I<not> IDN!) used to create the connection, rarely the IP address.	415	(I<not> IDN!) used to create the connection, rarely the IP address.
252		416
253	Apart from being useful in error messages, this string is also used in TLS	417	Apart from being useful in error messages, this string is also used in TLS
254	common name verification (see C<verify_cn> in L<AnyEvent::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>.
255		421
256	=item tls => "accept" | "connect" | Net::SSLeay::SSL object	422	=item tls => "accept" | "connect" | Net::SSLeay::SSL object
257		423
258	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
259	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
260	established and will transparently encrypt/decrypt data afterwards.	426	established and will transparently encrypt/decrypt data afterwards.
261		427
262	All TLS protocol errors will be signalled as C<EPROTO>, with an	428	All TLS protocol errors will be signalled as C<EPROTO>, with an
263	appropriate error message.	429	appropriate error message.
264		430
265	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
266	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
267	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
268	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.
269		436
270	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
271	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>
272	mode.	439	mode.
273		440
…		…
284	B<IMPORTANT:> since Net::SSLeay "objects" are really only integers,	451	B<IMPORTANT:> since Net::SSLeay "objects" are really only integers,
285	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
286	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
287	segmentation fault.	454	segmentation fault.
288		455
289	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.
290		457
291	=item tls_ctx => $anyevent_tls	458	=item tls_ctx => $anyevent_tls
292		459
293	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
294	(unless a connection object was specified directly). If this parameter is	461	(unless a connection object was specified directly). If this
295	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>.
296		464
297	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
298	=> 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
299	new TLS context object.	467	new TLS context object.
300		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
301	=item json => JSON or JSON::XS object	501	=item json => L<JSON> or L<JSON::XS> object
302		502
303	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.
304		504
305	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
306	suitable one (on demand), which will write and expect UTF-8 encoded JSON	506	suitable one (on demand), which will write and expect UTF-8 encoded JSON
307	texts.	507	texts.
308		508
309	Note that you are responsible to depend on the JSON module if you want to	509	Note that you are responsible to depend on the L<JSON> module if you want
310	use this functionality, as AnyEvent does not have a dependency itself.	510	to use this functionality, as AnyEvent does not have a dependency on it
		511	itself.
		512
		513	=item cbor => L<CBOR::XS> object
		514
		515	This is the cbor coder object used by the C<cbor> read and write types.
		516
		517	If you don't supply it, then AnyEvent::Handle will create and use a
		518	suitable one (on demand), which will write CBOR without using extensions,
		519	if possible. texts.
		520
		521	Note that you are responsible to depend on the L<CBOR::XS> module if you
		522	want to use this functionality, as AnyEvent does not have a dependency on
		523	it itself.
311		524
312	=back	525	=back
313		526
314	=cut	527	=cut
315		528
316	sub new {	529	sub new {
317	my $class = shift;	530	my $class = shift;
318	my $self = bless { @_ }, $class;	531	my $self = bless { @_ }, $class;
319		532
320	$self->{fh} or Carp::croak "mandatory argument fh is missing";	533	if ($self->{fh}) {
		534	$self->_start;
		535	return unless $self->{fh}; # could be gone by now
		536
		537	} elsif ($self->{connect}) {
		538	require AnyEvent::Socket;
		539
		540	$self->{peername} = $self->{connect}[0]
		541	unless exists $self->{peername};
		542
		543	$self->{_skip_drain_rbuf} = 1;
		544
		545	{
		546	Scalar::Util::weaken (my $self = $self);
		547
		548	$self->{_connect} =
		549	AnyEvent::Socket::tcp_connect (
		550	$self->{connect}[0],
		551	$self->{connect}[1],
		552	sub {
		553	my ($fh, $host, $port, $retry) = @_;
		554
		555	delete $self->{_connect}; # no longer needed
		556
		557	if ($fh) {
		558	$self->{fh} = $fh;
		559
		560	delete $self->{_skip_drain_rbuf};
		561	$self->_start;
		562
		563	$self->{on_connect}
		564	and $self->{on_connect}($self, $host, $port, sub {
		565	delete @$self{qw(fh _tw _rtw _wtw _ww _rw _eof _queue rbuf _wbuf tls _tls_rbuf _tls_wbuf)};
		566	$self->{_skip_drain_rbuf} = 1;
		567	&$retry;
		568	});
		569
		570	} else {
		571	if ($self->{on_connect_error}) {
		572	$self->{on_connect_error}($self, "$!");
		573	$self->destroy if $self;
		574	} else {
		575	$self->_error ($!, 1);
		576	}
		577	}
		578	},
		579	sub {
		580	local $self->{fh} = $_[0];
		581
		582	$self->{on_prepare}
		583	? $self->{on_prepare}->($self)
		584	: ()
		585	}
		586	);
		587	}
		588
		589	} else {
		590	Carp::croak "AnyEvent::Handle: either an existing fh or the connect parameter must be specified";
		591	}
		592
		593	$self
		594	}
		595
		596	sub _start {
		597	my ($self) = @_;
		598
		599	# too many clueless people try to use udp and similar sockets
		600	# with AnyEvent::Handle, do them a favour.
		601	my $type = getsockopt $self->{fh}, Socket::SOL_SOCKET (), Socket::SO_TYPE ();
		602	Carp::croak "AnyEvent::Handle: only stream sockets supported, anything else will NOT work!"
		603	if Socket::SOCK_STREAM () != (unpack "I", $type) && defined $type;
321		604
322	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	605	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
323		606
		607	$self->{_activity} =
		608	$self->{_ractivity} =
324	$self->{_activity} = AnyEvent->now;	609	$self->{_wactivity} = AE::now;
325	$self->_timeout;
326		610
		611	$self->{read_size} ||= 2048;
		612	$self->{max_read_size} = $self->{read_size}
		613	if $self->{read_size} > ($self->{max_read_size} || MAX_READ_SIZE);
		614
		615	$self->timeout (delete $self->{timeout} ) if $self->{timeout};
		616	$self->rtimeout (delete $self->{rtimeout} ) if $self->{rtimeout};
		617	$self->wtimeout (delete $self->{wtimeout} ) if $self->{wtimeout};
		618
327	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};	619	$self->no_delay (delete $self->{no_delay} ) if exists $self->{no_delay} && $self->{no_delay};
		620	$self->keepalive (delete $self->{keepalive}) if exists $self->{keepalive} && $self->{keepalive};
328		621
		622	$self->oobinline (exists $self->{oobinline} ? delete $self->{oobinline} : 1);
		623
329	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})	624	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})
330	if $self->{tls};	625	if $self->{tls};
331		626
332	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};	627	$self->on_drain (delete $self->{on_drain} ) if $self->{on_drain};
333		628
334	$self->start_read	629	$self->start_read
335	if $self->{on_read};	630	if $self->{on_read} || @{ $self->{_queue} };
336		631
337	$self->{fh} && $self	632	$self->_drain_wbuf;
338	}
339
340	sub _shutdown {
341	my ($self) = @_;
342
343	delete @$self{qw(_tw _rw _ww fh wbuf on_read _queue)};
344	$self->{_eof} = 1; # tell starttls et. al to stop trying
345
346	&_freetls;
347	}	633	}
348		634
349	sub _error {	635	sub _error {
350	my ($self, $errno, $fatal, $message) = @_;	636	my ($self, $errno, $fatal, $message) = @_;
351		637
352	$self->_shutdown
353	if $fatal;
354
355	$! = $errno;	638	$! = $errno;
356	$message ||= "$!";	639	$message ||= "$!";
357		640
358	if ($self->{on_error}) {	641	if ($self->{on_error}) {
359	$self->{on_error}($self, $fatal, $message);	642	$self->{on_error}($self, $fatal, $message);
360	} elsif ($self->{fh}) {	643	$self->destroy if $fatal;
		644	} elsif ($self->{fh} || $self->{connect}) {
		645	$self->destroy;
361	Carp::croak "AnyEvent::Handle uncaught error: $message";	646	Carp::croak "AnyEvent::Handle uncaught error: $message";
362	}	647	}
363	}	648	}
364		649
365	=item $fh = $handle->fh	650	=item $fh = $handle->fh
…		…
390	$_[0]{on_eof} = $_[1];	675	$_[0]{on_eof} = $_[1];
391	}	676	}
392		677
393	=item $handle->on_timeout ($cb)	678	=item $handle->on_timeout ($cb)
394		679
395	Replace the current C<on_timeout> callback, or disables the callback (but	680	=item $handle->on_rtimeout ($cb)
396	not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor
397	argument and method.
398		681
399	=cut	682	=item $handle->on_wtimeout ($cb)
400		683
401	sub on_timeout {	684	Replace the current C<on_timeout>, C<on_rtimeout> or C<on_wtimeout>
402	$_[0]{on_timeout} = $_[1];	685	callback, or disables the callback (but not the timeout) if C<$cb> =
403	}	686	C<undef>. See the C<timeout> constructor argument and method.
		687
		688	=cut
		689
		690	# see below
404		691
405	=item $handle->autocork ($boolean)	692	=item $handle->autocork ($boolean)
406		693
407	Enables or disables the current autocork behaviour (see C<autocork>	694	Enables or disables the current autocork behaviour (see C<autocork>
408	constructor argument). Changes will only take effect on the next write.	695	constructor argument). Changes will only take effect on the next write.
…		…
421	=cut	708	=cut
422		709
423	sub no_delay {	710	sub no_delay {
424	$_[0]{no_delay} = $_[1];	711	$_[0]{no_delay} = $_[1];
425		712
		713	setsockopt $_[0]{fh}, Socket::IPPROTO_TCP (), Socket::TCP_NODELAY (), int $_[1]
		714	if $_[0]{fh};
		715	}
		716
		717	=item $handle->keepalive ($boolean)
		718
		719	Enables or disables the C<keepalive> setting (see constructor argument of
		720	the same name for details).
		721
		722	=cut
		723
		724	sub keepalive {
		725	$_[0]{keepalive} = $_[1];
		726
426	eval {	727	eval {
427	local $SIG{__DIE__};	728	local $SIG{__DIE__};
428	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1];	729	setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_KEEPALIVE (), int $_[1]
		730	if $_[0]{fh};
429	};	731	};
430	}	732	}
431		733
		734	=item $handle->oobinline ($boolean)
		735
		736	Enables or disables the C<oobinline> setting (see constructor argument of
		737	the same name for details).
		738
		739	=cut
		740
		741	sub oobinline {
		742	$_[0]{oobinline} = $_[1];
		743
		744	eval {
		745	local $SIG{__DIE__};
		746	setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_OOBINLINE (), int $_[1]
		747	if $_[0]{fh};
		748	};
		749	}
		750
		751	=item $handle->keepalive ($boolean)
		752
		753	Enables or disables the C<keepalive> setting (see constructor argument of
		754	the same name for details).
		755
		756	=cut
		757
		758	sub keepalive {
		759	$_[0]{keepalive} = $_[1];
		760
		761	eval {
		762	local $SIG{__DIE__};
		763	setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_KEEPALIVE (), int $_[1]
		764	if $_[0]{fh};
		765	};
		766	}
		767
		768	=item $handle->on_starttls ($cb)
		769
		770	Replace the current C<on_starttls> callback (see the C<on_starttls> constructor argument).
		771
		772	=cut
		773
		774	sub on_starttls {
		775	$_[0]{on_starttls} = $_[1];
		776	}
		777
		778	=item $handle->on_stoptls ($cb)
		779
		780	Replace the current C<on_stoptls> callback (see the C<on_stoptls> constructor argument).
		781
		782	=cut
		783
		784	sub on_stoptls {
		785	$_[0]{on_stoptls} = $_[1];
		786	}
		787
		788	=item $handle->rbuf_max ($max_octets)
		789
		790	Configures the C<rbuf_max> setting (C<undef> disables it).
		791
		792	=item $handle->wbuf_max ($max_octets)
		793
		794	Configures the C<wbuf_max> setting (C<undef> disables it).
		795
		796	=cut
		797
		798	sub rbuf_max {
		799	$_[0]{rbuf_max} = $_[1];
		800	}
		801
		802	sub wbuf_max {
		803	$_[0]{wbuf_max} = $_[1];
		804	}
		805
432	#############################################################################	806	#############################################################################
433		807
434	=item $handle->timeout ($seconds)	808	=item $handle->timeout ($seconds)
435		809
		810	=item $handle->rtimeout ($seconds)
		811
		812	=item $handle->wtimeout ($seconds)
		813
436	Configures (or disables) the inactivity timeout.	814	Configures (or disables) the inactivity timeout.
437		815
438	=cut	816	The timeout will be checked instantly, so this method might destroy the
		817	handle before it returns.
439		818
440	sub timeout {	819	=item $handle->timeout_reset
		820
		821	=item $handle->rtimeout_reset
		822
		823	=item $handle->wtimeout_reset
		824
		825	Reset the activity timeout, as if data was received or sent.
		826
		827	These methods are cheap to call.
		828
		829	=cut
		830
		831	for my $dir ("", "r", "w") {
		832	my $timeout = "${dir}timeout";
		833	my $tw = "_${dir}tw";
		834	my $on_timeout = "on_${dir}timeout";
		835	my $activity = "_${dir}activity";
		836	my $cb;
		837
		838	*$on_timeout = sub {
		839	$_[0]{$on_timeout} = $_[1];
		840	};
		841
		842	*$timeout = sub {
441	my ($self, $timeout) = @_;	843	my ($self, $new_value) = @_;
442		844
		845	$new_value >= 0
		846	or Carp::croak "AnyEvent::Handle->$timeout called with negative timeout ($new_value), caught";
		847
443	$self->{timeout} = $timeout;	848	$self->{$timeout} = $new_value;
444	$self->_timeout;	849	delete $self->{$tw}; &$cb;
445	}	850	};
446		851
		852	*{"${dir}timeout_reset"} = sub {
		853	$_[0]{$activity} = AE::now;
		854	};
		855
		856	# main workhorse:
447	# reset the timeout watcher, as neccessary	857	# reset the timeout watcher, as neccessary
448	# also check for time-outs	858	# also check for time-outs
449	sub _timeout {	859	$cb = sub {
450	my ($self) = @_;	860	my ($self) = @_;
451		861
452	if ($self->{timeout}) {	862	if ($self->{$timeout} && $self->{fh}) {
453	my $NOW = AnyEvent->now;	863	my $NOW = AE::now;
454		864
455	# when would the timeout trigger?	865	# when would the timeout trigger?
456	my $after = $self->{_activity} + $self->{timeout} - $NOW;	866	my $after = $self->{$activity} + $self->{$timeout} - $NOW;
457		867
458	# now or in the past already?	868	# now or in the past already?
459	if ($after <= 0) {	869	if ($after <= 0) {
460	$self->{_activity} = $NOW;	870	$self->{$activity} = $NOW;
461		871
462	if ($self->{on_timeout}) {	872	if ($self->{$on_timeout}) {
463	$self->{on_timeout}($self);	873	$self->{$on_timeout}($self);
464	} else {	874	} else {
465	$self->_error (&Errno::ETIMEDOUT);	875	$self->_error (Errno::ETIMEDOUT);
		876	}
		877
		878	# callback could have changed timeout value, optimise
		879	return unless $self->{$timeout};
		880
		881	# calculate new after
		882	$after = $self->{$timeout};
466	}	883	}
467		884
468	# callback could have changed timeout value, optimise	885	Scalar::Util::weaken $self;
469	return unless $self->{timeout};	886	return unless $self; # ->error could have destroyed $self
470		887
471	# calculate new after	888	$self->{$tw} ||= AE::timer $after, 0, sub {
472	$after = $self->{timeout};	889	delete $self->{$tw};
		890	$cb->($self);
		891	};
		892	} else {
		893	delete $self->{$tw};
473	}	894	}
474
475	Scalar::Util::weaken $self;
476	return unless $self; # ->error could have destroyed $self
477
478	$self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub {
479	delete $self->{_tw};
480	$self->_timeout;
481	});
482	} else {
483	delete $self->{_tw};
484	}	895	}
485	}	896	}
486		897
487	#############################################################################	898	#############################################################################
488		899
…		…
495		906
496	The write queue is very simple: you can add data to its end, and	907	The write queue is very simple: you can add data to its end, and
497	AnyEvent::Handle will automatically try to get rid of it for you.	908	AnyEvent::Handle will automatically try to get rid of it for you.
498		909
499	When data could be written and the write buffer is shorter then the low	910	When data could be written and the write buffer is shorter then the low
500	water mark, the C<on_drain> callback will be invoked.	911	water mark, the C<on_drain> callback will be invoked once.
501		912
502	=over 4	913	=over 4
503		914
504	=item $handle->on_drain ($cb)	915	=item $handle->on_drain ($cb)
505		916
506	Sets the C<on_drain> callback or clears it (see the description of	917	Sets the C<on_drain> callback or clears it (see the description of
507	C<on_drain> in the constructor).	918	C<on_drain> in the constructor).
508		919
		920	This method may invoke callbacks (and therefore the handle might be
		921	destroyed after it returns).
		922
509	=cut	923	=cut
510		924
511	sub on_drain {	925	sub on_drain {
512	my ($self, $cb) = @_;	926	my ($self, $cb) = @_;
513		927
…		…
517	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});	931	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});
518	}	932	}
519		933
520	=item $handle->push_write ($data)	934	=item $handle->push_write ($data)
521		935
522	Queues the given scalar to be written. You can push as much data as you	936	Queues the given scalar to be written. You can push as much data as
523	want (only limited by the available memory), as C<AnyEvent::Handle>	937	you want (only limited by the available memory and C<wbuf_max>), as
524	buffers it independently of the kernel.	938	C<AnyEvent::Handle> buffers it independently of the kernel.
		939
		940	This method may invoke callbacks (and therefore the handle might be
		941	destroyed after it returns).
525		942
526	=cut	943	=cut
527		944
528	sub _drain_wbuf {	945	sub _drain_wbuf {
529	my ($self) = @_;	946	my ($self) = @_;
…		…
533	Scalar::Util::weaken $self;	950	Scalar::Util::weaken $self;
534		951
535	my $cb = sub {	952	my $cb = sub {
536	my $len = syswrite $self->{fh}, $self->{wbuf};	953	my $len = syswrite $self->{fh}, $self->{wbuf};
537		954
538	if ($len >= 0) {	955	if (defined $len) {
539	substr $self->{wbuf}, 0, $len, "";	956	substr $self->{wbuf}, 0, $len, "";
540		957
541	$self->{_activity} = AnyEvent->now;	958	$self->{_activity} = $self->{_wactivity} = AE::now;
542		959
543	$self->{on_drain}($self)	960	$self->{on_drain}($self)
544	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})	961	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
545	&& $self->{on_drain};	962	&& $self->{on_drain};
546		963
…		…
552		969
553	# try to write data immediately	970	# try to write data immediately
554	$cb->() unless $self->{autocork};	971	$cb->() unless $self->{autocork};
555		972
556	# if still data left in wbuf, we need to poll	973	# if still data left in wbuf, we need to poll
557	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)	974	$self->{_ww} = AE::io $self->{fh}, 1, $cb
558	if length $self->{wbuf};	975	if length $self->{wbuf};
		976
		977	if (
		978	defined $self->{wbuf_max}
		979	&& $self->{wbuf_max} < length $self->{wbuf}
		980	) {
		981	$self->_error (Errno::ENOSPC, 1), return;
		982	}
559	};	983	};
560	}	984	}
561		985
562	our %WH;	986	our %WH;
563		987
		988	# deprecated
564	sub register_write_type($$) {	989	sub register_write_type($$) {
565	$WH{$_[0]} = $_[1];	990	$WH{$_[0]} = $_[1];
566	}	991	}
567		992
568	sub push_write {	993	sub push_write {
569	my $self = shift;	994	my $self = shift;
570		995
571	if (@_ > 1) {	996	if (@_ > 1) {
572	my $type = shift;	997	my $type = shift;
573		998
		999	@_ = ($WH{$type} ||= _load_func "$type\::anyevent_write_type"
574	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")	1000	or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::push_write")
575	->($self, @_);	1001	->($self, @_);
576	}	1002	}
577		1003
		1004	# we downgrade here to avoid hard-to-track-down bugs,
		1005	# and diagnose the problem earlier and better.
		1006
578	if ($self->{tls}) {	1007	if ($self->{tls}) {
579	$self->{_tls_wbuf} .= $_[0];	1008	utf8::downgrade $self->{_tls_wbuf} .= $_[0];
580		1009	&_dotls ($self) if $self->{fh};
581	&_dotls ($self);
582	} else {	1010	} else {
583	$self->{wbuf} .= $_[0];	1011	utf8::downgrade $self->{wbuf} .= $_[0];
584	$self->_drain_wbuf;	1012	$self->_drain_wbuf if $self->{fh};
585	}	1013	}
586	}	1014	}
587		1015
588	=item $handle->push_write (type => @args)	1016	=item $handle->push_write (type => @args)
589		1017
590	Instead of formatting your data yourself, you can also let this module do	1018	Instead of formatting your data yourself, you can also let this module
591	the job by specifying a type and type-specific arguments.	1019	do the job by specifying a type and type-specific arguments. You
		1020	can also specify the (fully qualified) name of a package, in which
		1021	case AnyEvent tries to load the package and then expects to find the
		1022	C<anyevent_write_type> function inside (see "custom write types", below).
592		1023
593	Predefined types are (if you have ideas for additional types, feel free to	1024	Predefined types are (if you have ideas for additional types, feel free to
594	drop by and tell us):	1025	drop by and tell us):
595		1026
596	=over 4	1027	=over 4
…		…
635		1066
636	The generated JSON text is guaranteed not to contain any newlines: While	1067	The generated JSON text is guaranteed not to contain any newlines: While
637	this module doesn't need delimiters after or between JSON texts to be	1068	this module doesn't need delimiters after or between JSON texts to be
638	able to read them, many other languages depend on that.	1069	able to read them, many other languages depend on that.
639		1070
640	A simple RPC protocol that interoperates easily with others is to send	1071	A simple RPC protocol that interoperates easily with other languages is
641	JSON arrays (or objects, although arrays are usually the better choice as	1072	to send JSON arrays (or objects, although arrays are usually the better
642	they mimic how function argument passing works) and a newline after each	1073	choice as they mimic how function argument passing works) and a newline
643	JSON text:	1074	after each JSON text:
644		1075
645	$handle->push_write (json => ["method", "arg1", "arg2"]); # whatever	1076	$handle->push_write (json => ["method", "arg1", "arg2"]); # whatever
646	$handle->push_write ("\012");	1077	$handle->push_write ("\012");
647		1078
648	An AnyEvent::Handle receiver would simply use the C<json> read type and	1079	An AnyEvent::Handle receiver would simply use the C<json> read type and
…		…
651	$handle->push_read (json => sub { my $array = $_[1]; ... });	1082	$handle->push_read (json => sub { my $array = $_[1]; ... });
652		1083
653	Other languages could read single lines terminated by a newline and pass	1084	Other languages could read single lines terminated by a newline and pass
654	this line into their JSON decoder of choice.	1085	this line into their JSON decoder of choice.
655		1086
		1087	=item cbor => $perl_scalar
		1088
		1089	Encodes the given scalar into a CBOR value. Unless you provide your own
		1090	L<CBOR::XS> object, this means it will be encoded to a CBOR string not
		1091	using any extensions, if possible.
		1092
		1093	CBOR values are self-delimiting, so you can write CBOR at one end of
		1094	a handle and read them at the other end without using any additional
		1095	framing.
		1096
		1097	A simple nd very very fast RPC protocol that interoperates with
		1098	other languages is to send CBOR and receive CBOR values (arrays are
		1099	recommended):
		1100
		1101	$handle->push_write (cbor => ["method", "arg1", "arg2"]); # whatever
		1102
		1103	An AnyEvent::Handle receiver would simply use the C<cbor> read type:
		1104
		1105	$handle->push_read (cbor => sub { my $array = $_[1]; ... });
		1106
656	=cut	1107	=cut
		1108
		1109	sub json_coder() {
		1110	eval { require JSON::XS; JSON::XS->new->utf8 }
		1111	|| do { require JSON; JSON->new->utf8 }
		1112	}
657		1113
658	register_write_type json => sub {	1114	register_write_type json => sub {
659	my ($self, $ref) = @_;	1115	my ($self, $ref) = @_;
660		1116
661	require JSON;	1117	($self->{json} ||= json_coder)
		1118	->encode ($ref)
		1119	};
662		1120
663	$self->{json} ? $self->{json}->encode ($ref)	1121	sub cbor_coder() {
664	: JSON::encode_json ($ref)	1122	require CBOR::XS;
		1123	CBOR::XS->new
		1124	}
		1125
		1126	register_write_type cbor => sub {
		1127	my ($self, $scalar) = @_;
		1128
		1129	($self->{cbor} ||= cbor_coder)
		1130	->encode ($scalar)
665	};	1131	};
666		1132
667	=item storable => $reference	1133	=item storable => $reference
668		1134
669	Freezes the given reference using L<Storable> and writes it to the	1135	Freezes the given reference using L<Storable> and writes it to the
…		…
672	=cut	1138	=cut
673		1139
674	register_write_type storable => sub {	1140	register_write_type storable => sub {
675	my ($self, $ref) = @_;	1141	my ($self, $ref) = @_;
676		1142
677	require Storable;	1143	require Storable unless $Storable::VERSION;
678		1144
679	pack "w/a*", Storable::nfreeze ($ref)	1145	pack "w/a*", Storable::nfreeze ($ref)
680	};	1146	};
681		1147
682	=back	1148	=back
683		1149
684	=item $handle->push_shutdown	1150	=item $handle->push_shutdown
685		1151
686	Sometimes you know you want to close the socket after writing your data	1152	Sometimes you know you want to close the socket after writing your data
687	before it was actually written. One way to do that is to replace your	1153	before it was actually written. One way to do that is to replace your
688	C<on_drain> handler by a callback that shuts down the socket. This method	1154	C<on_drain> handler by a callback that shuts down the socket (and set
689	is a shorthand for just that, and replaces the C<on_drain> callback with:	1155	C<low_water_mark> to C<0>). This method is a shorthand for just that, and
		1156	replaces the C<on_drain> callback with:
690		1157
691	sub { shutdown $_[0]{fh}, 1 } # for push_shutdown	1158	sub { shutdown $_[0]{fh}, 1 }
692		1159
693	This simply shuts down the write side and signals an EOF condition to the	1160	This simply shuts down the write side and signals an EOF condition to the
694	the peer.	1161	the peer.
695		1162
696	You can rely on the normal read queue and C<on_eof> handling	1163	You can rely on the normal read queue and C<on_eof> handling
697	afterwards. This is the cleanest way to close a connection.	1164	afterwards. This is the cleanest way to close a connection.
698		1165
		1166	This method may invoke callbacks (and therefore the handle might be
		1167	destroyed after it returns).
		1168
699	=cut	1169	=cut
700		1170
701	sub push_shutdown {	1171	sub push_shutdown {
		1172	my ($self) = @_;
		1173
		1174	delete $self->{low_water_mark};
702	$_[0]->{on_drain} = sub { shutdown $_[0]{fh}, 1 };	1175	$self->on_drain (sub { shutdown $_[0]{fh}, 1 });
703	}	1176	}
704		1177
705	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)	1178	=item custom write types - Package::anyevent_write_type $handle, @args
706		1179
707	This function (not method) lets you add your own types to C<push_write>.	1180	Instead of one of the predefined types, you can also specify the name of
		1181	a package. AnyEvent will try to load the package and then expects to find
		1182	a function named C<anyevent_write_type> inside. If it isn't found, it
		1183	progressively tries to load the parent package until it either finds the
		1184	function (good) or runs out of packages (bad).
		1185
708	Whenever the given C<type> is used, C<push_write> will invoke the code	1186	Whenever the given C<type> is used, C<push_write> will the function with
709	reference with the handle object and the remaining arguments.	1187	the handle object and the remaining arguments.
710		1188
711	The code reference is supposed to return a single octet string that will	1189	The function is supposed to return a single octet string that will be
712	be appended to the write buffer.	1190	appended to the write buffer, so you can mentally treat this function as a
		1191	"arguments to on-the-wire-format" converter.
713		1192
714	Note that this is a function, and all types registered this way will be	1193	Example: implement a custom write type C<join> that joins the remaining
715	global, so try to use unique names.	1194	arguments using the first one.
		1195
		1196	$handle->push_write (My::Type => " ", 1,2,3);
		1197
		1198	# uses the following package, which can be defined in the "My::Type" or in
		1199	# the "My" modules to be auto-loaded, or just about anywhere when the
		1200	# My::Type::anyevent_write_type is defined before invoking it.
		1201
		1202	package My::Type;
		1203
		1204	sub anyevent_write_type {
		1205	my ($handle, $delim, @args) = @_;
		1206
		1207	join $delim, @args
		1208	}
716		1209
717	=cut	1210	=cut
718		1211
719	#############################################################################	1212	#############################################################################
720		1213
…		…
729	ways, the "simple" way, using only C<on_read> and the "complex" way, using	1222	ways, the "simple" way, using only C<on_read> and the "complex" way, using
730	a queue.	1223	a queue.
731		1224
732	In the simple case, you just install an C<on_read> callback and whenever	1225	In the simple case, you just install an C<on_read> callback and whenever
733	new data arrives, it will be called. You can then remove some data (if	1226	new data arrives, it will be called. You can then remove some data (if
734	enough is there) from the read buffer (C<< $handle->rbuf >>). Or you cna	1227	enough is there) from the read buffer (C<< $handle->rbuf >>). Or you can
735	leave the data there if you want to accumulate more (e.g. when only a	1228	leave the data there if you want to accumulate more (e.g. when only a
736	partial message has been received so far).	1229	partial message has been received so far), or change the read queue with
		1230	e.g. C<push_read>.
737		1231
738	In the more complex case, you want to queue multiple callbacks. In this	1232	In the more complex case, you want to queue multiple callbacks. In this
739	case, AnyEvent::Handle will call the first queued callback each time new	1233	case, AnyEvent::Handle will call the first queued callback each time new
740	data arrives (also the first time it is queued) and removes it when it has	1234	data arrives (also the first time it is queued) and remove it when it has
741	done its job (see C<push_read>, below).	1235	done its job (see C<push_read>, below).
742		1236
743	This way you can, for example, push three line-reads, followed by reading	1237	This way you can, for example, push three line-reads, followed by reading
744	a chunk of data, and AnyEvent::Handle will execute them in order.	1238	a chunk of data, and AnyEvent::Handle will execute them in order.
745		1239
…		…
802	=cut	1296	=cut
803		1297
804	sub _drain_rbuf {	1298	sub _drain_rbuf {
805	my ($self) = @_;	1299	my ($self) = @_;
806		1300
		1301	# avoid recursion
		1302	return if $self->{_skip_drain_rbuf};
807	local $self->{_in_drain} = 1;	1303	local $self->{_skip_drain_rbuf} = 1;
808
809	if (
810	defined $self->{rbuf_max}
811	&& $self->{rbuf_max} < length $self->{rbuf}
812	) {
813	$self->_error (&Errno::ENOSPC, 1), return;
814	}
815		1304
816	while () {	1305	while () {
817	# we need to use a separate tls read buffer, as we must not receive data while	1306	# we need to use a separate tls read buffer, as we must not receive data while
818	# we are draining the buffer, and this can only happen with TLS.	1307	# we are draining the buffer, and this can only happen with TLS.
819	$self->{rbuf} .= delete $self->{_tls_rbuf} if exists $self->{_tls_rbuf};	1308	$self->{rbuf} .= delete $self->{_tls_rbuf}
		1309	if exists $self->{_tls_rbuf};
820		1310
821	my $len = length $self->{rbuf};	1311	my $len = length $self->{rbuf};
822		1312
823	if (my $cb = shift @{ $self->{_queue} }) {	1313	if (my $cb = shift @{ $self->{_queue} }) {
824	unless ($cb->($self)) {	1314	unless ($cb->($self)) {
825	if ($self->{_eof}) {	1315	# no progress can be made
826	# no progress can be made (not enough data and no data forthcoming)	1316	# (not enough data and no data forthcoming)
827	$self->_error (&Errno::EPIPE, 1), return;	1317	$self->_error (Errno::EPIPE, 1), return
828	}	1318	if $self->{_eof};
829		1319
830	unshift @{ $self->{_queue} }, $cb;	1320	unshift @{ $self->{_queue} }, $cb;
831	last;	1321	last;
832	}	1322	}
833	} elsif ($self->{on_read}) {	1323	} elsif ($self->{on_read}) {
…		…
840	&& !@{ $self->{_queue} } # and the queue is still empty	1330	&& !@{ $self->{_queue} } # and the queue is still empty
841	&& $self->{on_read} # but we still have on_read	1331	&& $self->{on_read} # but we still have on_read
842	) {	1332	) {
843	# no further data will arrive	1333	# no further data will arrive
844	# so no progress can be made	1334	# so no progress can be made
845	$self->_error (&Errno::EPIPE, 1), return	1335	$self->_error (Errno::EPIPE, 1), return
846	if $self->{_eof};	1336	if $self->{_eof};
847		1337
848	last; # more data might arrive	1338	last; # more data might arrive
849	}	1339	}
850	} else {	1340	} else {
…		…
853	last;	1343	last;
854	}	1344	}
855	}	1345	}
856		1346
857	if ($self->{_eof}) {	1347	if ($self->{_eof}) {
858	if ($self->{on_eof}) {	1348	$self->{on_eof}
859	$self->{on_eof}($self)	1349	? $self->{on_eof}($self)
860	} else {	1350	: $self->_error (0, 1, "Unexpected end-of-file");
861	$self->_error (0, 1);	1351
862	}	1352	return;
		1353	}
		1354
		1355	if (
		1356	defined $self->{rbuf_max}
		1357	&& $self->{rbuf_max} < length $self->{rbuf}
		1358	) {
		1359	$self->_error (Errno::ENOSPC, 1), return;
863	}	1360	}
864		1361
865	# may need to restart read watcher	1362	# may need to restart read watcher
866	unless ($self->{_rw}) {	1363	unless ($self->{_rw}) {
867	$self->start_read	1364	$self->start_read
…		…
873		1370
874	This replaces the currently set C<on_read> callback, or clears it (when	1371	This replaces the currently set C<on_read> callback, or clears it (when
875	the new callback is C<undef>). See the description of C<on_read> in the	1372	the new callback is C<undef>). See the description of C<on_read> in the
876	constructor.	1373	constructor.
877		1374
		1375	This method may invoke callbacks (and therefore the handle might be
		1376	destroyed after it returns).
		1377
878	=cut	1378	=cut
879		1379
880	sub on_read {	1380	sub on_read {
881	my ($self, $cb) = @_;	1381	my ($self, $cb) = @_;
882		1382
883	$self->{on_read} = $cb;	1383	$self->{on_read} = $cb;
884	$self->_drain_rbuf if $cb && !$self->{_in_drain};	1384	$self->_drain_rbuf if $cb;
885	}	1385	}
886		1386
887	=item $handle->rbuf	1387	=item $handle->rbuf
888		1388
889	Returns the read buffer (as a modifiable lvalue).	1389	Returns the read buffer (as a modifiable lvalue). You can also access the
		1390	read buffer directly as the C<< ->{rbuf} >> member, if you want (this is
		1391	much faster, and no less clean).
890		1392
891	You can access the read buffer directly as the C<< ->{rbuf} >>	1393	The only operation allowed on the read buffer (apart from looking at it)
892	member, if you want. However, the only operation allowed on the	1394	is removing data from its beginning. Otherwise modifying or appending to
893	read buffer (apart from looking at it) is removing data from its	1395	it is not allowed and will lead to hard-to-track-down bugs.
894	beginning. Otherwise modifying or appending to it is not allowed and will
895	lead to hard-to-track-down bugs.
896		1396
897	NOTE: The read buffer should only be used or modified if the C<on_read>,	1397	NOTE: The read buffer should only be used or modified in the C<on_read>
898	C<push_read> or C<unshift_read> methods are used. The other read methods	1398	callback or when C<push_read> or C<unshift_read> are used with a single
899	automatically manage the read buffer.	1399	callback (i.e. untyped). Typed C<push_read> and C<unshift_read> methods
		1400	will manage the read buffer on their own.
900		1401
901	=cut	1402	=cut
902		1403
903	sub rbuf : lvalue {	1404	sub rbuf : lvalue {
904	$_[0]{rbuf}	1405	$_[0]{rbuf}
…		…
921		1422
922	If enough data was available, then the callback must remove all data it is	1423	If enough data was available, then the callback must remove all data it is
923	interested in (which can be none at all) and return a true value. After returning	1424	interested in (which can be none at all) and return a true value. After returning
924	true, it will be removed from the queue.	1425	true, it will be removed from the queue.
925		1426
		1427	These methods may invoke callbacks (and therefore the handle might be
		1428	destroyed after it returns).
		1429
926	=cut	1430	=cut
927		1431
928	our %RH;	1432	our %RH;
929		1433
930	sub register_read_type($$) {	1434	sub register_read_type($$) {
…		…
936	my $cb = pop;	1440	my $cb = pop;
937		1441
938	if (@_) {	1442	if (@_) {
939	my $type = shift;	1443	my $type = shift;
940		1444
		1445	$cb = ($RH{$type} ||= _load_func "$type\::anyevent_read_type"
941	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")	1446	or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::push_read")
942	->($self, $cb, @_);	1447	->($self, $cb, @_);
943	}	1448	}
944		1449
945	push @{ $self->{_queue} }, $cb;	1450	push @{ $self->{_queue} }, $cb;
946	$self->_drain_rbuf unless $self->{_in_drain};	1451	$self->_drain_rbuf;
947	}	1452	}
948		1453
949	sub unshift_read {	1454	sub unshift_read {
950	my $self = shift;	1455	my $self = shift;
951	my $cb = pop;	1456	my $cb = pop;
952		1457
953	if (@_) {	1458	if (@_) {
954	my $type = shift;	1459	my $type = shift;
955		1460
		1461	$cb = ($RH{$type} ||= _load_func "$type\::anyevent_read_type"
956	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read")	1462	or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::unshift_read")
957	->($self, $cb, @_);	1463	->($self, $cb, @_);
958	}	1464	}
959		1465
960
961	unshift @{ $self->{_queue} }, $cb;	1466	unshift @{ $self->{_queue} }, $cb;
962	$self->_drain_rbuf unless $self->{_in_drain};	1467	$self->_drain_rbuf;
963	}	1468	}
964		1469
965	=item $handle->push_read (type => @args, $cb)	1470	=item $handle->push_read (type => @args, $cb)
966		1471
967	=item $handle->unshift_read (type => @args, $cb)	1472	=item $handle->unshift_read (type => @args, $cb)
968		1473
969	Instead of providing a callback that parses the data itself you can chose	1474	Instead of providing a callback that parses the data itself you can chose
970	between a number of predefined parsing formats, for chunks of data, lines	1475	between a number of predefined parsing formats, for chunks of data, lines
971	etc.	1476	etc. You can also specify the (fully qualified) name of a package, in
		1477	which case AnyEvent tries to load the package and then expects to find the
		1478	C<anyevent_read_type> function inside (see "custom read types", below).
972		1479
973	Predefined types are (if you have ideas for additional types, feel free to	1480	Predefined types are (if you have ideas for additional types, feel free to
974	drop by and tell us):	1481	drop by and tell us):
975		1482
976	=over 4	1483	=over 4
…		…
982	data.	1489	data.
983		1490
984	Example: read 2 bytes.	1491	Example: read 2 bytes.
985		1492
986	$handle->push_read (chunk => 2, sub {	1493	$handle->push_read (chunk => 2, sub {
987	warn "yay ", unpack "H*", $_[1];	1494	say "yay " . unpack "H*", $_[1];
988	});	1495	});
989		1496
990	=cut	1497	=cut
991		1498
992	register_read_type chunk => sub {	1499	register_read_type chunk => sub {
…		…
1022		1529
1023	register_read_type line => sub {	1530	register_read_type line => sub {
1024	my ($self, $cb, $eol) = @_;	1531	my ($self, $cb, $eol) = @_;
1025		1532
1026	if (@_ < 3) {	1533	if (@_ < 3) {
1027	# this is more than twice as fast as the generic code below	1534	# this is faster then the generic code below
1028	sub {	1535	sub {
1029	$_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return;	1536	(my $pos = index $_[0]{rbuf}, "\012") >= 0
		1537	or return;
1030		1538
		1539	(my $str = substr $_[0]{rbuf}, 0, $pos + 1, "") =~ s/(\015?\012)\Z// or die;
1031	$cb->($_[0], $1, $2);	1540	$cb->($_[0], $str, "$1");
1032	1	1541	1
1033	}	1542	}
1034	} else {	1543	} else {
1035	$eol = quotemeta $eol unless ref $eol;	1544	$eol = quotemeta $eol unless ref $eol;
1036	$eol = qr|^(.*?)($eol)|s;	1545	$eol = qr|^(.*?)($eol)|s;
1037		1546
1038	sub {	1547	sub {
1039	$_[0]{rbuf} =~ s/$eol// or return;	1548	$_[0]{rbuf} =~ s/$eol// or return;
1040		1549
1041	$cb->($_[0], $1, $2);	1550	$cb->($_[0], "$1", "$2");
1042	1	1551	1
1043	}	1552	}
1044	}	1553	}
1045	};	1554	};
1046		1555
…		…
1068	the receive buffer when neither C<$accept> nor C<$reject> match,	1577	the receive buffer when neither C<$accept> nor C<$reject> match,
1069	and everything preceding and including the match will be accepted	1578	and everything preceding and including the match will be accepted
1070	unconditionally. This is useful to skip large amounts of data that you	1579	unconditionally. This is useful to skip large amounts of data that you
1071	know cannot be matched, so that the C<$accept> or C<$reject> regex do not	1580	know cannot be matched, so that the C<$accept> or C<$reject> regex do not
1072	have to start matching from the beginning. This is purely an optimisation	1581	have to start matching from the beginning. This is purely an optimisation
1073	and is usually worth only when you expect more than a few kilobytes.	1582	and is usually worth it only when you expect more than a few kilobytes.
1074		1583
1075	Example: expect a http header, which ends at C<\015\012\015\012>. Since we	1584	Example: expect a http header, which ends at C<\015\012\015\012>. Since we
1076	expect the header to be very large (it isn't in practise, but...), we use	1585	expect the header to be very large (it isn't in practice, but...), we use
1077	a skip regex to skip initial portions. The skip regex is tricky in that	1586	a skip regex to skip initial portions. The skip regex is tricky in that
1078	it only accepts something not ending in either \015 or \012, as these are	1587	it only accepts something not ending in either \015 or \012, as these are
1079	required for the accept regex.	1588	required for the accept regex.
1080		1589
1081	$handle->push_read (regex =>	1590	$handle->push_read (regex =>
…		…
1094		1603
1095	sub {	1604	sub {
1096	# accept	1605	# accept
1097	if ($$rbuf =~ $accept) {	1606	if ($$rbuf =~ $accept) {
1098	$data .= substr $$rbuf, 0, $+[0], "";	1607	$data .= substr $$rbuf, 0, $+[0], "";
1099	$cb->($self, $data);	1608	$cb->($_[0], $data);
1100	return 1;	1609	return 1;
1101	}	1610	}
1102		1611
1103	# reject	1612	# reject
1104	if ($reject && $$rbuf =~ $reject) {	1613	if ($reject && $$rbuf =~ $reject) {
1105	$self->_error (&Errno::EBADMSG);	1614	$_[0]->_error (Errno::EBADMSG);
1106	}	1615	}
1107		1616
1108	# skip	1617	# skip
1109	if ($skip && $$rbuf =~ $skip) {	1618	if ($skip && $$rbuf =~ $skip) {
1110	$data .= substr $$rbuf, 0, $+[0], "";	1619	$data .= substr $$rbuf, 0, $+[0], "";
…		…
1126	my ($self, $cb) = @_;	1635	my ($self, $cb) = @_;
1127		1636
1128	sub {	1637	sub {
1129	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {	1638	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {
1130	if ($_[0]{rbuf} =~ /[^0-9]/) {	1639	if ($_[0]{rbuf} =~ /[^0-9]/) {
1131	$self->_error (&Errno::EBADMSG);	1640	$_[0]->_error (Errno::EBADMSG);
1132	}	1641	}
1133	return;	1642	return;
1134	}	1643	}
1135		1644
1136	my $len = $1;	1645	my $len = $1;
1137		1646
1138	$self->unshift_read (chunk => $len, sub {	1647	$_[0]->unshift_read (chunk => $len, sub {
1139	my $string = $_[1];	1648	my $string = $_[1];
1140	$_[0]->unshift_read (chunk => 1, sub {	1649	$_[0]->unshift_read (chunk => 1, sub {
1141	if ($_[1] eq ",") {	1650	if ($_[1] eq ",") {
1142	$cb->($_[0], $string);	1651	$cb->($_[0], $string);
1143	} else {	1652	} else {
1144	$self->_error (&Errno::EBADMSG);	1653	$_[0]->_error (Errno::EBADMSG);
1145	}	1654	}
1146	});	1655	});
1147	});	1656	});
1148		1657
1149	1	1658	1
…		…
1216	=cut	1725	=cut
1217		1726
1218	register_read_type json => sub {	1727	register_read_type json => sub {
1219	my ($self, $cb) = @_;	1728	my ($self, $cb) = @_;
1220		1729
1221	require JSON;	1730	my $json = $self->{json} ||= json_coder;
1222		1731
1223	my $data;	1732	my $data;
1224	my $rbuf = \$self->{rbuf};
1225
1226	my $json = $self->{json} ||= JSON->new->utf8;
1227		1733
1228	sub {	1734	sub {
1229	my $ref = eval { $json->incr_parse ($self->{rbuf}) };	1735	my $ref = eval { $json->incr_parse ($_[0]{rbuf}) };
1230		1736
1231	if ($ref) {	1737	if ($ref) {
1232	$self->{rbuf} = $json->incr_text;	1738	$_[0]{rbuf} = $json->incr_text;
1233	$json->incr_text = "";	1739	$json->incr_text = "";
1234	$cb->($self, $ref);	1740	$cb->($_[0], $ref);
1235		1741
1236	1	1742	1
1237	} elsif ($@) {	1743	} elsif ($@) {
1238	# error case	1744	# error case
1239	$json->incr_skip;	1745	$json->incr_skip;
1240		1746
1241	$self->{rbuf} = $json->incr_text;	1747	$_[0]{rbuf} = $json->incr_text;
1242	$json->incr_text = "";	1748	$json->incr_text = "";
1243		1749
1244	$self->_error (&Errno::EBADMSG);	1750	$_[0]->_error (Errno::EBADMSG);
1245		1751
1246	()	1752	()
1247	} else {	1753	} else {
1248	$self->{rbuf} = "";	1754	$_[0]{rbuf} = "";
1249		1755
		1756	()
		1757	}
		1758	}
		1759	};
		1760
		1761	=item cbor => $cb->($handle, $scalar)
		1762
		1763	Reads a CBOR value, decodes it and passes it to the callback. When a parse
		1764	error occurs, an C<EBADMSG> error will be raised.
		1765
		1766	If a L<CBOR::XS> object was passed to the constructor, then that will be
		1767	used for the final decode, otherwise it will create a CBOR coder without
		1768	enabling any options.
		1769
		1770	You have to provide a dependency to L<CBOR::XS> on your own: this module
		1771	will load the L<CBOR::XS> module, but AnyEvent does not depend on it
		1772	itself.
		1773
		1774	Since CBOR values are fully self-delimiting, the C<cbor> read and write
		1775	types are an ideal simple RPC protocol: just exchange CBOR datagrams. See
		1776	the C<cbor> write type description, above, for an actual example.
		1777
		1778	=cut
		1779
		1780	register_read_type cbor => sub {
		1781	my ($self, $cb) = @_;
		1782
		1783	my $cbor = $self->{cbor} ||= cbor_coder;
		1784
		1785	my $data;
		1786
		1787	sub {
		1788	my (@value) = eval { $cbor->incr_parse ($_[0]{rbuf}) };
		1789
		1790	if (@value) {
		1791	$cb->($_[0], @value);
		1792
		1793	1
		1794	} elsif ($@) {
		1795	# error case
		1796	$cbor->incr_reset;
		1797
		1798	$_[0]->_error (Errno::EBADMSG);
		1799
		1800	()
		1801	} else {
1250	()	1802	()
1251	}	1803	}
1252	}	1804	}
1253	};	1805	};
1254		1806
…		…
1263	=cut	1815	=cut
1264		1816
1265	register_read_type storable => sub {	1817	register_read_type storable => sub {
1266	my ($self, $cb) = @_;	1818	my ($self, $cb) = @_;
1267		1819
1268	require Storable;	1820	require Storable unless $Storable::VERSION;
1269		1821
1270	sub {	1822	sub {
1271	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method	1823	# when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method
1272	defined (my $len = eval { unpack "w", $_[0]{rbuf} })	1824	defined (my $len = eval { unpack "w", $_[0]{rbuf} })
1273	or return;	1825	or return;
…		…
1276		1828
1277	# bypass unshift if we already have the remaining chunk	1829	# bypass unshift if we already have the remaining chunk
1278	if ($format + $len <= length $_[0]{rbuf}) {	1830	if ($format + $len <= length $_[0]{rbuf}) {
1279	my $data = substr $_[0]{rbuf}, $format, $len;	1831	my $data = substr $_[0]{rbuf}, $format, $len;
1280	substr $_[0]{rbuf}, 0, $format + $len, "";	1832	substr $_[0]{rbuf}, 0, $format + $len, "";
		1833
1281	$cb->($_[0], Storable::thaw ($data));	1834	eval { $cb->($_[0], Storable::thaw ($data)); 1 }
		1835	or return $_[0]->_error (Errno::EBADMSG);
1282	} else {	1836	} else {
1283	# remove prefix	1837	# remove prefix
1284	substr $_[0]{rbuf}, 0, $format, "";	1838	substr $_[0]{rbuf}, 0, $format, "";
1285		1839
1286	# read remaining chunk	1840	# read remaining chunk
1287	$_[0]->unshift_read (chunk => $len, sub {	1841	$_[0]->unshift_read (chunk => $len, sub {
1288	if (my $ref = eval { Storable::thaw ($_[1]) }) {	1842	eval { $cb->($_[0], Storable::thaw ($_[1])); 1 }
1289	$cb->($_[0], $ref);
1290	} else {
1291	$self->_error (&Errno::EBADMSG);	1843	or $_[0]->_error (Errno::EBADMSG);
1292	}
1293	});	1844	});
1294	}	1845	}
1295		1846
1296	1	1847	1
1297	}	1848	}
1298	};	1849	};
1299		1850
		1851	=item tls_detect => $cb->($handle, $detect, $major, $minor)
		1852
		1853	Checks the input stream for a valid SSL or TLS handshake TLSPaintext
		1854	record without consuming anything. Only SSL version 3 or higher
		1855	is handled, up to the fictituous protocol 4.x (but both SSL3+ and
		1856	SSL2-compatible framing is supported).
		1857
		1858	If it detects that the input data is likely TLS, it calls the callback
		1859	with a true value for C<$detect> and the (on-wire) TLS version as second
		1860	and third argument (C<$major> is C<3>, and C<$minor> is 0..3 for SSL
		1861	3.0, TLS 1.0, 1.1 and 1.2, respectively). If it detects the input to
		1862	be definitely not TLS, it calls the callback with a false value for
		1863	C<$detect>.
		1864
		1865	The callback could use this information to decide whether or not to start
		1866	TLS negotiation.
		1867
		1868	In all cases the data read so far is passed to the following read
		1869	handlers.
		1870
		1871	Usually you want to use the C<tls_autostart> read type instead.
		1872
		1873	If you want to design a protocol that works in the presence of TLS
		1874	dtection, make sure that any non-TLS data doesn't start with the octet 22
		1875	(ASCII SYN, 16 hex) or 128-255 (i.e. highest bit set). The checks this
		1876	read type does are a bit more strict, but might losen in the future to
		1877	accomodate protocol changes.
		1878
		1879	This read type does not rely on L<AnyEvent::TLS> (and thus, not on
		1880	L<Net::SSLeay>).
		1881
		1882	=item tls_autostart => $tls[, $tls_ctx]
		1883
		1884	Tries to detect a valid SSL or TLS handshake. If one is detected, it tries
		1885	to start tls by calling C<starttls> with the given arguments.
		1886
		1887	In practise, C<$tls> must be C<accept>, or a Net::SSLeay context that has
		1888	been configured to accept, as servers do not normally send a handshake on
		1889	their own and ths cannot be detected in this way.
		1890
		1891	See C<tls_detect> above for more details.
		1892
		1893	Example: give the client a chance to start TLS before accepting a text
		1894	line.
		1895
		1896	$hdl->push_read (tls_detect => "accept");
		1897	$hdl->push_read (line => sub {
		1898	print "received ", ($_[0]{tls} ? "encrypted" : "cleartext"), " <$_[1]>\n";
		1899	});
		1900
		1901	=cut
		1902
		1903	register_read_type tls_detect => sub {
		1904	my ($self, $cb) = @_;
		1905
		1906	sub {
		1907	# this regex matches a full or partial tls record
		1908	if (
		1909	# ssl3+: type(22=handshake) major(=3) minor(any) length_hi
		1910	$self->{rbuf} =~ /^(?:\z| \x16 (\z| [\x03\x04] (?:\z| . (?:\z| [\x00-\x40] ))))/xs
		1911	# ssl2 comapatible: len_hi len_lo type(1) major minor dummy(forlength)
		1912	or $self->{rbuf} =~ /^(?:\z| [\x80-\xff] (?:\z| . (?:\z| \x01 (\z| [\x03\x04] (?:\z| . (?:\z| . ))))))/xs
		1913	) {
		1914	return if 3 != length $1; # partial match, can't decide yet
		1915
		1916	# full match, valid TLS record
		1917	my ($major, $minor) = unpack "CC", $1;
		1918	$cb->($self, "accept", $major + $minor * 0.1);
		1919	} else {
		1920	# mismatch == guaranteed not TLS
		1921	$cb->($self, undef);
		1922	}
		1923
		1924	1
		1925	}
		1926	};
		1927
		1928	register_read_type tls_autostart => sub {
		1929	my ($self, @tls) = @_;
		1930
		1931	$RH{tls_detect}($self, sub {
		1932	return unless $_[1];
		1933	$_[0]->starttls (@tls);
		1934	})
		1935	};
		1936
1300	=back	1937	=back
1301		1938
1302	=item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args)	1939	=item custom read types - Package::anyevent_read_type $handle, $cb, @args
1303		1940
1304	This function (not method) lets you add your own types to C<push_read>.	1941	Instead of one of the predefined types, you can also specify the name
		1942	of a package. AnyEvent will try to load the package and then expects to
		1943	find a function named C<anyevent_read_type> inside. If it isn't found, it
		1944	progressively tries to load the parent package until it either finds the
		1945	function (good) or runs out of packages (bad).
1305		1946
1306	Whenever the given C<type> is used, C<push_read> will invoke the code	1947	Whenever this type is used, C<push_read> will invoke the function with the
1307	reference with the handle object, the callback and the remaining	1948	handle object, the original callback and the remaining arguments.
1308	arguments.
1309		1949
1310	The code reference is supposed to return a callback (usually a closure)	1950	The function is supposed to return a callback (usually a closure) that
1311	that works as a plain read callback (see C<< ->push_read ($cb) >>).	1951	works as a plain read callback (see C<< ->push_read ($cb) >>), so you can
		1952	mentally treat the function as a "configurable read type to read callback"
		1953	converter.
1312		1954
1313	It should invoke the passed callback when it is done reading (remember to	1955	It should invoke the original callback when it is done reading (remember
1314	pass C<$handle> as first argument as all other callbacks do that).	1956	to pass C<$handle> as first argument as all other callbacks do that,
		1957	although there is no strict requirement on this).
1315		1958
1316	Note that this is a function, and all types registered this way will be
1317	global, so try to use unique names.
1318
1319	For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>,	1959	For examples, see the source of this module (F<perldoc -m
1320	search for C<register_read_type>)).	1960	AnyEvent::Handle>, search for C<register_read_type>)).
1321		1961
1322	=item $handle->stop_read	1962	=item $handle->stop_read
1323		1963
1324	=item $handle->start_read	1964	=item $handle->start_read
1325		1965
…		…
1331	Note that AnyEvent::Handle will automatically C<start_read> for you when	1971	Note that AnyEvent::Handle will automatically C<start_read> for you when
1332	you change the C<on_read> callback or push/unshift a read callback, and it	1972	you change the C<on_read> callback or push/unshift a read callback, and it
1333	will automatically C<stop_read> for you when neither C<on_read> is set nor	1973	will automatically C<stop_read> for you when neither C<on_read> is set nor
1334	there are any read requests in the queue.	1974	there are any read requests in the queue.
1335		1975
1336	These methods will have no effect when in TLS mode (as TLS doesn't support	1976	In older versions of this module (<= 5.3), these methods had no effect,
1337	half-duplex connections).	1977	as TLS does not support half-duplex connections. In current versions they
		1978	work as expected, as this behaviour is required to avoid certain resource
		1979	attacks, where the program would be forced to read (and buffer) arbitrary
		1980	amounts of data before being able to send some data. The drawback is that
		1981	some readings of the the SSL/TLS specifications basically require this
		1982	attack to be working, as SSL/TLS implementations might stall sending data
		1983	during a rehandshake.
		1984
		1985	As a guideline, during the initial handshake, you should not stop reading,
		1986	and as a client, it might cause problems, depending on your application.
1338		1987
1339	=cut	1988	=cut
1340		1989
1341	sub stop_read {	1990	sub stop_read {
1342	my ($self) = @_;	1991	my ($self) = @_;
1343		1992
1344	delete $self->{_rw} unless $self->{tls};	1993	delete $self->{_rw};
1345	}	1994	}
1346		1995
1347	sub start_read {	1996	sub start_read {
1348	my ($self) = @_;	1997	my ($self) = @_;
1349		1998
1350	unless ($self->{_rw} || $self->{_eof}) {	1999	unless ($self->{_rw} || $self->{_eof} || !$self->{fh}) {
1351	Scalar::Util::weaken $self;	2000	Scalar::Util::weaken $self;
1352		2001
1353	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	2002	$self->{_rw} = AE::io $self->{fh}, 0, sub {
1354	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});	2003	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1355	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;	2004	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size}, length $$rbuf;
1356		2005
1357	if ($len > 0) {	2006	if ($len > 0) {
1358	$self->{_activity} = AnyEvent->now;	2007	$self->{_activity} = $self->{_ractivity} = AE::now;
1359		2008
1360	if ($self->{tls}) {	2009	if ($self->{tls}) {
1361	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);	2010	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1362		2011
1363	&_dotls ($self);	2012	&_dotls ($self);
1364	} else {	2013	} else {
1365	$self->_drain_rbuf unless $self->{_in_drain};	2014	$self->_drain_rbuf;
		2015	}
		2016
		2017	if ($len == $self->{read_size}) {
		2018	$self->{read_size} *= 2;
		2019	$self->{read_size} = $self->{max_read_size} || MAX_READ_SIZE
		2020	if $self->{read_size} > ($self->{max_read_size} || MAX_READ_SIZE);
1366	}	2021	}
1367		2022
1368	} elsif (defined $len) {	2023	} elsif (defined $len) {
1369	delete $self->{_rw};	2024	delete $self->{_rw};
1370	$self->{_eof} = 1;	2025	$self->{_eof} = 1;
1371	$self->_drain_rbuf unless $self->{_in_drain};	2026	$self->_drain_rbuf;
1372		2027
1373	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	2028	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
1374	return $self->_error ($!, 1);	2029	return $self->_error ($!, 1);
1375	}	2030	}
1376	});	2031	};
1377	}	2032	}
1378	}	2033	}
1379		2034
1380	our $ERROR_SYSCALL;	2035	our $ERROR_SYSCALL;
1381	our $ERROR_WANT_READ;	2036	our $ERROR_WANT_READ;
1382	our $ERROR_ZERO_RETURN;
1383		2037
1384	sub _tls_error {	2038	sub _tls_error {
1385	my ($self, $err) = @_;	2039	my ($self, $err) = @_;
1386	warn "$err,$!\n";#d#
1387		2040
1388	return $self->_error ($!, 1)	2041	return $self->_error ($!, 1)
1389	if $err == Net::SSLeay::ERROR_SYSCALL ();	2042	if $err == Net::SSLeay::ERROR_SYSCALL ();
1390		2043
		2044	my $err = Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ());
		2045
		2046	# reduce error string to look less scary
		2047	$err =~ s/^error:[0-9a-fA-F]{8}:[^:]+:([^:]+):/\L$1: /;
		2048
		2049	if ($self->{_on_starttls}) {
		2050	(delete $self->{_on_starttls})->($self, undef, $err);
		2051	&_freetls;
		2052	} else {
		2053	&_freetls;
1391	$self->_error (&Errno::EPROTO, 1,	2054	$self->_error (Errno::EPROTO, 1, $err);
1392	Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ()));	2055	}
1393	}	2056	}
1394		2057
1395	# poll the write BIO and send the data if applicable	2058	# poll the write BIO and send the data if applicable
1396	# also decode read data if possible	2059	# also decode read data if possible
1397	# this is basiclaly our TLS state machine	2060	# this is basiclaly our TLS state machine
…		…
1408	}	2071	}
1409		2072
1410	$tmp = Net::SSLeay::get_error ($self->{tls}, $tmp);	2073	$tmp = Net::SSLeay::get_error ($self->{tls}, $tmp);
1411	return $self->_tls_error ($tmp)	2074	return $self->_tls_error ($tmp)
1412	if $tmp != $ERROR_WANT_READ	2075	if $tmp != $ERROR_WANT_READ
1413	&& ($tmp != $ERROR_SYSCALL || $!)	2076	&& ($tmp != $ERROR_SYSCALL || $!);
1414	&& $tmp != $ERROR_ZERO_RETURN;
1415	}	2077	}
1416		2078
1417	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {	2079	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
1418	unless (length $tmp) {	2080	unless (length $tmp) {
1419	# let's treat SSL-eof as we treat normal EOF	2081	$self->{_on_starttls}
1420	delete $self->{_rw};	2082	and (delete $self->{_on_starttls})->($self, undef, "EOF during handshake"); # ???
1421	$self->{_eof} = 1;
1422	&_freetls;	2083	&_freetls;
		2084
		2085	if ($self->{on_stoptls}) {
		2086	$self->{on_stoptls}($self);
		2087	return;
		2088	} else {
		2089	# let's treat SSL-eof as we treat normal EOF
		2090	delete $self->{_rw};
		2091	$self->{_eof} = 1;
		2092	}
1423	}	2093	}
1424		2094
1425	$self->{_tls_rbuf} .= $tmp;	2095	$self->{_tls_rbuf} .= $tmp;
1426	$self->_drain_rbuf unless $self->{_in_drain};	2096	$self->_drain_rbuf;
1427	$self->{tls} or return; # tls session might have gone away in callback	2097	$self->{tls} or return; # tls session might have gone away in callback
1428	}	2098	}
1429		2099
1430	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);	2100	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
1431	return $self->_tls_error ($tmp)	2101	return $self->_tls_error ($tmp)
1432	if $tmp != $ERROR_WANT_READ	2102	if $tmp != $ERROR_WANT_READ
1433	&& ($tmp != $ERROR_SYSCALL || $!)	2103	&& ($tmp != $ERROR_SYSCALL || $!);
1434	&& $tmp != $ERROR_ZERO_RETURN;
1435		2104
1436	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {	2105	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1437	$self->{wbuf} .= $tmp;	2106	$self->{wbuf} .= $tmp;
1438	$self->_drain_wbuf;	2107	$self->_drain_wbuf;
		2108	$self->{tls} or return; # tls session might have gone away in callback
1439	}	2109	}
		2110
		2111	$self->{_on_starttls}
		2112	and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK ()
		2113	and (delete $self->{_on_starttls})->($self, 1, "TLS/SSL connection established");
1440	}	2114	}
1441		2115
1442	=item $handle->starttls ($tls[, $tls_ctx])	2116	=item $handle->starttls ($tls[, $tls_ctx])
1443		2117
1444	Instead of starting TLS negotiation immediately when the AnyEvent::Handle	2118	Instead of starting TLS negotiation immediately when the AnyEvent::Handle
1445	object is created, you can also do that at a later time by calling	2119	object is created, you can also do that at a later time by calling
1446	C<starttls>.	2120	C<starttls>. See the C<tls> constructor argument for general info.
		2121
		2122	Starting TLS is currently an asynchronous operation - when you push some
		2123	write data and then call C<< ->starttls >> then TLS negotiation will start
		2124	immediately, after which the queued write data is then sent. This might
		2125	change in future versions, so best make sure you have no outstanding write
		2126	data when calling this method.
1447		2127
1448	The first argument is the same as the C<tls> constructor argument (either	2128	The first argument is the same as the C<tls> constructor argument (either
1449	C<"connect">, C<"accept"> or an existing Net::SSLeay object).	2129	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
1450		2130
1451	The second argument is the optional C<AnyEvent::TLS> object that is used	2131	The second argument is the optional C<AnyEvent::TLS> object that is used
…		…
1456	The TLS connection object will end up in C<< $handle->{tls} >>, the TLS	2136	The TLS connection object will end up in C<< $handle->{tls} >>, the TLS
1457	context in C<< $handle->{tls_ctx} >> after this call and can be used or	2137	context in C<< $handle->{tls_ctx} >> after this call and can be used or
1458	changed to your liking. Note that the handshake might have already started	2138	changed to your liking. Note that the handshake might have already started
1459	when this function returns.	2139	when this function returns.
1460		2140
1461	If it an error to start a TLS handshake more than once per	2141	Due to bugs in OpenSSL, it might or might not be possible to do multiple
1462	AnyEvent::Handle object (this is due to bugs in OpenSSL).	2142	handshakes on the same stream. It is best to not attempt to use the
		2143	stream after stopping TLS.
1463		2144
		2145	This method may invoke callbacks (and therefore the handle might be
		2146	destroyed after it returns).
		2147
1464	=cut	2148	=cut
		2149
		2150	our %TLS_CACHE; #TODO not yet documented, should we?
1465		2151
1466	sub starttls {	2152	sub starttls {
1467	my ($self, $ssl, $ctx) = @_;	2153	my ($self, $tls, $ctx) = @_;
1468		2154
1469	require Net::SSLeay;	2155	Carp::croak "It is an error to call starttls on an AnyEvent::Handle object while TLS is already active, caught"
1470
1471	Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object"
1472	if $self->{tls};	2156	if $self->{tls};
1473		2157
		2158	unless (defined $AnyEvent::TLS::VERSION) {
		2159	eval {
		2160	require Net::SSLeay;
		2161	require AnyEvent::TLS;
		2162	1
		2163	} or return $self->_error (Errno::EPROTO, 1, "TLS support not available on this system");
		2164	}
		2165
		2166	$self->{tls} = $tls;
		2167	$self->{tls_ctx} = $ctx if @_ > 2;
		2168
		2169	return unless $self->{fh};
		2170
1474	$ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL ();	2171	$ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL ();
1475	$ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ ();	2172	$ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ ();
1476	$ERROR_ZERO_RETURN = Net::SSLeay::ERROR_ZERO_RETURN ();
1477		2173
		2174	$tls = delete $self->{tls};
1478	$ctx ||= $self->{tls_ctx};	2175	$ctx = $self->{tls_ctx};
		2176
		2177	local $Carp::CarpLevel = 1; # skip ourselves when creating a new context or session
1479		2178
1480	if ("HASH" eq ref $ctx) {	2179	if ("HASH" eq ref $ctx) {
1481	require AnyEvent::TLS;	2180	if ($ctx->{cache}) {
1482		2181	my $key = $ctx+0;
1483	local $Carp::CarpLevel = 1; # skip ourselves when creating a new context	2182	$ctx = $TLS_CACHE{$key} ||= new AnyEvent::TLS %$ctx;
		2183	} else {
1484	$ctx = new AnyEvent::TLS %$ctx;	2184	$ctx = new AnyEvent::TLS %$ctx;
		2185	}
1485	}	2186	}
1486		2187
1487	$self->{tls_ctx} = $ctx || TLS_CTX ();	2188	$self->{tls_ctx} = $ctx || TLS_CTX ();
1488	$self->{tls} = $ssl = $self->{tls_ctx}->_get_session ($ssl, $self, $self->{peername});	2189	$self->{tls} = $tls = $self->{tls_ctx}->_get_session ($tls, $self, $self->{peername});
1489		2190
1490	# basically, this is deep magic (because SSL_read should have the same issues)	2191	# basically, this is deep magic (because SSL_read should have the same issues)
1491	# but the openssl maintainers basically said: "trust us, it just works".	2192	# but the openssl maintainers basically said: "trust us, it just works".
1492	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	2193	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1493	# and mismaintained ssleay-module doesn't even offer them).	2194	# and mismaintained ssleay-module doesn't even offer them).
…		…
1500	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to	2201	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
1501	# have identity issues in that area.	2202	# have identity issues in that area.
1502	# Net::SSLeay::CTX_set_mode ($ssl,	2203	# Net::SSLeay::CTX_set_mode ($ssl,
1503	# (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)	2204	# (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)
1504	# | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));	2205	# | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));
1505	Net::SSLeay::CTX_set_mode ($ssl, 1|2);	2206	Net::SSLeay::CTX_set_mode ($tls, 1|2);
1506		2207
1507	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	2208	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1508	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	2209	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1509		2210
		2211	Net::SSLeay::BIO_write ($self->{_rbio}, $self->{rbuf});
		2212	$self->{rbuf} = "";
		2213
1510	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	2214	Net::SSLeay::set_bio ($tls, $self->{_rbio}, $self->{_wbio});
		2215
		2216	$self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) }
		2217	if $self->{on_starttls};
1511		2218
1512	&_dotls; # need to trigger the initial handshake	2219	&_dotls; # need to trigger the initial handshake
1513	$self->start_read; # make sure we actually do read	2220	$self->start_read; # make sure we actually do read
1514	}	2221	}
1515		2222
1516	=item $handle->stoptls	2223	=item $handle->stoptls
1517		2224
1518	Shuts down the SSL connection - this makes a proper EOF handshake by	2225	Shuts down the SSL connection - this makes a proper EOF handshake by
1519	sending a close notify to the other side, but since OpenSSL doesn't	2226	sending a close notify to the other side, but since OpenSSL doesn't
1520	support non-blocking shut downs, it is not possible to re-use the stream	2227	support non-blocking shut downs, it is not guaranteed that you can re-use
1521	afterwards.	2228	the stream afterwards.
		2229
		2230	This method may invoke callbacks (and therefore the handle might be
		2231	destroyed after it returns).
1522		2232
1523	=cut	2233	=cut
1524		2234
1525	sub stoptls {	2235	sub stoptls {
1526	my ($self) = @_;	2236	my ($self) = @_;
1527		2237
1528	if ($self->{tls}) {	2238	if ($self->{tls} && $self->{fh}) {
1529	Net::SSLeay::shutdown ($self->{tls});	2239	Net::SSLeay::shutdown ($self->{tls});
1530		2240
1531	&_dotls;	2241	&_dotls;
1532		2242
1533	# we don't give a shit. no, we do, but we can't. no...	2243	# # we don't give a shit. no, we do, but we can't. no...#d#
1534	# we, we... have to use openssl :/	2244	# # we, we... have to use openssl :/#d#
1535	&_freetls;	2245	# &_freetls;#d#
1536	}	2246	}
1537	}	2247	}
1538		2248
1539	sub _freetls {	2249	sub _freetls {
1540	my ($self) = @_;	2250	my ($self) = @_;
1541		2251
1542	return unless $self->{tls};	2252	return unless $self->{tls};
1543		2253
1544	$self->{tls_ctx}->_put_session (delete $self->{tls});	2254	$self->{tls_ctx}->_put_session (delete $self->{tls})
		2255	if $self->{tls} > 0;
1545		2256
1546	delete @$self{qw(_rbio _wbio _tls_wbuf)};	2257	delete @$self{qw(_rbio _wbio _tls_wbuf _on_starttls)};
1547	}	2258	}
		2259
		2260	=item $handle->resettls
		2261
		2262	This rarely-used method simply resets and TLS state on the handle, usually
		2263	causing data loss.
		2264
		2265	One case where it may be useful is when you want to skip over the data in
		2266	the stream but you are not interested in interpreting it, so data loss is
		2267	no concern.
		2268
		2269	=cut
		2270
		2271	*resettls = \&_freetls;
1548		2272
1549	sub DESTROY {	2273	sub DESTROY {
1550	my ($self) = @_;	2274	my ($self) = @_;
1551		2275
1552	&_freetls;	2276	&_freetls;
1553		2277
1554	my $linger = exists $self->{linger} ? $self->{linger} : 3600;	2278	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
1555		2279
1556	if ($linger && length $self->{wbuf}) {	2280	if ($linger && length $self->{wbuf} && $self->{fh}) {
1557	my $fh = delete $self->{fh};	2281	my $fh = delete $self->{fh};
1558	my $wbuf = delete $self->{wbuf};	2282	my $wbuf = delete $self->{wbuf};
1559		2283
1560	my @linger;	2284	my @linger;
1561		2285
1562	push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub {	2286	push @linger, AE::io $fh, 1, sub {
1563	my $len = syswrite $fh, $wbuf, length $wbuf;	2287	my $len = syswrite $fh, $wbuf, length $wbuf;
1564		2288
1565	if ($len > 0) {	2289	if ($len > 0) {
1566	substr $wbuf, 0, $len, "";	2290	substr $wbuf, 0, $len, "";
1567	} else {	2291	} elsif (defined $len || ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK)) {
1568	@linger = (); # end	2292	@linger = (); # end
1569	}	2293	}
1570	});	2294	};
1571	push @linger, AnyEvent->timer (after => $linger, cb => sub {	2295	push @linger, AE::timer $linger, 0, sub {
1572	@linger = ();	2296	@linger = ();
1573	});	2297	};
1574	}	2298	}
1575	}	2299	}
1576		2300
1577	=item $handle->destroy	2301	=item $handle->destroy
1578		2302
1579	Shuts down the handle object as much as possible - this call ensures that	2303	Shuts down the handle object as much as possible - this call ensures that
1580	no further callbacks will be invoked and resources will be freed as much	2304	no further callbacks will be invoked and as many resources as possible
1581	as possible. You must not call any methods on the object afterwards.	2305	will be freed. Any method you will call on the handle object after
		2306	destroying it in this way will be silently ignored (and it will return the
		2307	empty list).
1582		2308
1583	Normally, you can just "forget" any references to an AnyEvent::Handle	2309	Normally, you can just "forget" any references to an AnyEvent::Handle
1584	object and it will simply shut down. This works in fatal error and EOF	2310	object and it will simply shut down. This works in fatal error and EOF
1585	callbacks, as well as code outside. It does I<NOT> work in a read or write	2311	callbacks, as well as code outside. It does I<NOT> work in a read or write
1586	callback, so when you want to destroy the AnyEvent::Handle object from	2312	callback, so when you want to destroy the AnyEvent::Handle object from
1587	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in	2313	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
1588	that case.	2314	that case.
1589		2315
		2316	Destroying the handle object in this way has the advantage that callbacks
		2317	will be removed as well, so if those are the only reference holders (as
		2318	is common), then one doesn't need to do anything special to break any
		2319	reference cycles.
		2320
1590	The handle might still linger in the background and write out remaining	2321	The handle might still linger in the background and write out remaining
1591	data, as specified by the C<linger> option, however.	2322	data, as specified by the C<linger> option, however.
1592		2323
1593	=cut	2324	=cut
1594		2325
1595	sub destroy {	2326	sub destroy {
1596	my ($self) = @_;	2327	my ($self) = @_;
1597		2328
1598	$self->DESTROY;	2329	$self->DESTROY;
1599	%$self = ();	2330	%$self = ();
		2331	bless $self, "AnyEvent::Handle::destroyed";
1600	}	2332	}
		2333
		2334	sub AnyEvent::Handle::destroyed::AUTOLOAD {
		2335	#nop
		2336	}
		2337
		2338	=item $handle->destroyed
		2339
		2340	Returns false as long as the handle hasn't been destroyed by a call to C<<
		2341	->destroy >>, true otherwise.
		2342
		2343	Can be useful to decide whether the handle is still valid after some
		2344	callback possibly destroyed the handle. For example, C<< ->push_write >>,
		2345	C<< ->starttls >> and other methods can call user callbacks, which in turn
		2346	can destroy the handle, so work can be avoided by checking sometimes:
		2347
		2348	$hdl->starttls ("accept");
		2349	return if $hdl->destroyed;
		2350	$hdl->push_write (...
		2351
		2352	Note that the call to C<push_write> will silently be ignored if the handle
		2353	has been destroyed, so often you can just ignore the possibility of the
		2354	handle being destroyed.
		2355
		2356	=cut
		2357
		2358	sub destroyed { 0 }
		2359	sub AnyEvent::Handle::destroyed::destroyed { 1 }
1601		2360
1602	=item AnyEvent::Handle::TLS_CTX	2361	=item AnyEvent::Handle::TLS_CTX
1603		2362
1604	This function creates and returns the AnyEvent::TLS object used by default	2363	This function creates and returns the AnyEvent::TLS object used by default
1605	for TLS mode.	2364	for TLS mode.
…		…
1633		2392
1634	It is only safe to "forget" the reference inside EOF or error callbacks,	2393	It is only safe to "forget" the reference inside EOF or error callbacks,
1635	from within all other callbacks, you need to explicitly call the C<<	2394	from within all other callbacks, you need to explicitly call the C<<
1636	->destroy >> method.	2395	->destroy >> method.
1637		2396
		2397	=item Why is my C<on_eof> callback never called?
		2398
		2399	Probably because your C<on_error> callback is being called instead: When
		2400	you have outstanding requests in your read queue, then an EOF is
		2401	considered an error as you clearly expected some data.
		2402
		2403	To avoid this, make sure you have an empty read queue whenever your handle
		2404	is supposed to be "idle" (i.e. connection closes are O.K.). You can set
		2405	an C<on_read> handler that simply pushes the first read requests in the
		2406	queue.
		2407
		2408	See also the next question, which explains this in a bit more detail.
		2409
		2410	=item How can I serve requests in a loop?
		2411
		2412	Most protocols consist of some setup phase (authentication for example)
		2413	followed by a request handling phase, where the server waits for requests
		2414	and handles them, in a loop.
		2415
		2416	There are two important variants: The first (traditional, better) variant
		2417	handles requests until the server gets some QUIT command, causing it to
		2418	close the connection first (highly desirable for a busy TCP server). A
		2419	client dropping the connection is an error, which means this variant can
		2420	detect an unexpected detection close.
		2421
		2422	To handle this case, always make sure you have a non-empty read queue, by
		2423	pushing the "read request start" handler on it:
		2424
		2425	# we assume a request starts with a single line
		2426	my @start_request; @start_request = (line => sub {
		2427	my ($hdl, $line) = @_;
		2428
		2429	... handle request
		2430
		2431	# push next request read, possibly from a nested callback
		2432	$hdl->push_read (@start_request);
		2433	});
		2434
		2435	# auth done, now go into request handling loop
		2436	# now push the first @start_request
		2437	$hdl->push_read (@start_request);
		2438
		2439	By always having an outstanding C<push_read>, the handle always expects
		2440	some data and raises the C<EPIPE> error when the connction is dropped
		2441	unexpectedly.
		2442
		2443	The second variant is a protocol where the client can drop the connection
		2444	at any time. For TCP, this means that the server machine may run out of
		2445	sockets easier, and in general, it means you cannot distinguish a protocl
		2446	failure/client crash from a normal connection close. Nevertheless, these
		2447	kinds of protocols are common (and sometimes even the best solution to the
		2448	problem).
		2449
		2450	Having an outstanding read request at all times is possible if you ignore
		2451	C<EPIPE> errors, but this doesn't help with when the client drops the
		2452	connection during a request, which would still be an error.
		2453
		2454	A better solution is to push the initial request read in an C<on_read>
		2455	callback. This avoids an error, as when the server doesn't expect data
		2456	(i.e. is idly waiting for the next request, an EOF will not raise an
		2457	error, but simply result in an C<on_eof> callback. It is also a bit slower
		2458	and simpler:
		2459
		2460	# auth done, now go into request handling loop
		2461	$hdl->on_read (sub {
		2462	my ($hdl) = @_;
		2463
		2464	# called each time we receive data but the read queue is empty
		2465	# simply start read the request
		2466
		2467	$hdl->push_read (line => sub {
		2468	my ($hdl, $line) = @_;
		2469
		2470	... handle request
		2471
		2472	# do nothing special when the request has been handled, just
		2473	# let the request queue go empty.
		2474	});
		2475	});
		2476
1638	=item I get different callback invocations in TLS mode/Why can't I pause	2477	=item I get different callback invocations in TLS mode/Why can't I pause
1639	reading?	2478	reading?
1640		2479
1641	Unlike, say, TCP, TLS connections do not consist of two independent	2480	Unlike, say, TCP, TLS connections do not consist of two independent
1642	communication channels, one for each direction. Or put differently. The	2481	communication channels, one for each direction. Or put differently, the
1643	read and write directions are not independent of each other: you cannot	2482	read and write directions are not independent of each other: you cannot
1644	write data unless you are also prepared to read, and vice versa.	2483	write data unless you are also prepared to read, and vice versa.
1645		2484
1646	This can mean than, in TLS mode, you might get C<on_error> or C<on_eof>	2485	This means that, in TLS mode, you might get C<on_error> or C<on_eof>
1647	callback invocations when you are not expecting any read data - the reason	2486	callback invocations when you are not expecting any read data - the reason
1648	is that AnyEvent::Handle always reads in TLS mode.	2487	is that AnyEvent::Handle always reads in TLS mode.
1649		2488
1650	During the connection, you have to make sure that you always have a	2489	During the connection, you have to make sure that you always have a
1651	non-empty read-queue, or an C<on_read> watcher. At the end of the	2490	non-empty read-queue, or an C<on_read> watcher. At the end of the
…		…
1661		2500
1662	$handle->on_read (sub { });	2501	$handle->on_read (sub { });
1663	$handle->on_eof (undef);	2502	$handle->on_eof (undef);
1664	$handle->on_error (sub {	2503	$handle->on_error (sub {
1665	my $data = delete $_[0]{rbuf};	2504	my $data = delete $_[0]{rbuf};
1666	undef $handle;
1667	});	2505	});
		2506
		2507	Note that this example removes the C<rbuf> member from the handle object,
		2508	which is not normally allowed by the API. It is expressly permitted in
		2509	this case only, as the handle object needs to be destroyed afterwards.
1668		2510
1669	The reason to use C<on_error> is that TCP connections, due to latencies	2511	The reason to use C<on_error> is that TCP connections, due to latencies
1670	and packets loss, might get closed quite violently with an error, when in	2512	and packets loss, might get closed quite violently with an error, when in
1671	fact, all data has been received.	2513	fact all data has been received.
1672		2514
1673	It is usually better to use acknowledgements when transferring data,	2515	It is usually better to use acknowledgements when transferring data,
1674	to make sure the other side hasn't just died and you got the data	2516	to make sure the other side hasn't just died and you got the data
1675	intact. This is also one reason why so many internet protocols have an	2517	intact. This is also one reason why so many internet protocols have an
1676	explicit QUIT command.	2518	explicit QUIT command.
…		…
1683	C<low_water_mark> this will be called precisely when all data has been	2525	C<low_water_mark> this will be called precisely when all data has been
1684	written to the socket:	2526	written to the socket:
1685		2527
1686	$handle->push_write (...);	2528	$handle->push_write (...);
1687	$handle->on_drain (sub {	2529	$handle->on_drain (sub {
1688	warn "all data submitted to the kernel\n";	2530	AE::log debug => "All data submitted to the kernel.";
1689	undef $handle;	2531	undef $handle;
1690	});	2532	});
1691		2533
		2534	If you just want to queue some data and then signal EOF to the other side,
		2535	consider using C<< ->push_shutdown >> instead.
		2536
		2537	=item I want to contact a TLS/SSL server, I don't care about security.
		2538
		2539	If your TLS server is a pure TLS server (e.g. HTTPS) that only speaks TLS,
		2540	connect to it and then create the AnyEvent::Handle with the C<tls>
		2541	parameter:
		2542
		2543	tcp_connect $host, $port, sub {
		2544	my ($fh) = @_;
		2545
		2546	my $handle = new AnyEvent::Handle
		2547	fh => $fh,
		2548	tls => "connect",
		2549	on_error => sub { ... };
		2550
		2551	$handle->push_write (...);
		2552	};
		2553
		2554	=item I want to contact a TLS/SSL server, I do care about security.
		2555
		2556	Then you should additionally enable certificate verification, including
		2557	peername verification, if the protocol you use supports it (see
		2558	L<AnyEvent::TLS>, C<verify_peername>).
		2559
		2560	E.g. for HTTPS:
		2561
		2562	tcp_connect $host, $port, sub {
		2563	my ($fh) = @_;
		2564
		2565	my $handle = new AnyEvent::Handle
		2566	fh => $fh,
		2567	peername => $host,
		2568	tls => "connect",
		2569	tls_ctx => { verify => 1, verify_peername => "https" },
		2570	...
		2571
		2572	Note that you must specify the hostname you connected to (or whatever
		2573	"peername" the protocol needs) as the C<peername> argument, otherwise no
		2574	peername verification will be done.
		2575
		2576	The above will use the system-dependent default set of trusted CA
		2577	certificates. If you want to check against a specific CA, add the
		2578	C<ca_file> (or C<ca_cert>) arguments to C<tls_ctx>:
		2579
		2580	tls_ctx => {
		2581	verify => 1,
		2582	verify_peername => "https",
		2583	ca_file => "my-ca-cert.pem",
		2584	},
		2585
		2586	=item I want to create a TLS/SSL server, how do I do that?
		2587
		2588	Well, you first need to get a server certificate and key. You have
		2589	three options: a) ask a CA (buy one, use cacert.org etc.) b) create a
		2590	self-signed certificate (cheap. check the search engine of your choice,
		2591	there are many tutorials on the net) or c) make your own CA (tinyca2 is a
		2592	nice program for that purpose).
		2593
		2594	Then create a file with your private key (in PEM format, see
		2595	L<AnyEvent::TLS>), followed by the certificate (also in PEM format). The
		2596	file should then look like this:
		2597
		2598	-----BEGIN RSA PRIVATE KEY-----
		2599	...header data
		2600	... lots of base64'y-stuff
		2601	-----END RSA PRIVATE KEY-----
		2602
		2603	-----BEGIN CERTIFICATE-----
		2604	... lots of base64'y-stuff
		2605	-----END CERTIFICATE-----
		2606
		2607	The important bits are the "PRIVATE KEY" and "CERTIFICATE" parts. Then
		2608	specify this file as C<cert_file>:
		2609
		2610	tcp_server undef, $port, sub {
		2611	my ($fh) = @_;
		2612
		2613	my $handle = new AnyEvent::Handle
		2614	fh => $fh,
		2615	tls => "accept",
		2616	tls_ctx => { cert_file => "my-server-keycert.pem" },
		2617	...
		2618
		2619	When you have intermediate CA certificates that your clients might not
		2620	know about, just append them to the C<cert_file>.
		2621
1692	=back	2622	=back
1693
1694		2623
1695	=head1 SUBCLASSING AnyEvent::Handle	2624	=head1 SUBCLASSING AnyEvent::Handle
1696		2625
1697	In many cases, you might want to subclass AnyEvent::Handle.	2626	In many cases, you might want to subclass AnyEvent::Handle.
1698		2627
…		…
1715		2644
1716	=item * all members not documented here and not prefixed with an underscore	2645	=item * all members not documented here and not prefixed with an underscore
1717	are free to use in subclasses.	2646	are free to use in subclasses.
1718		2647
1719	Of course, new versions of AnyEvent::Handle may introduce more "public"	2648	Of course, new versions of AnyEvent::Handle may introduce more "public"
1720	member variables, but thats just life, at least it is documented.	2649	member variables, but that's just life. At least it is documented.
1721		2650
1722	=back	2651	=back
1723		2652
1724	=head1 AUTHOR	2653	=head1 AUTHOR
1725		2654
1726	Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>.	2655	Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>.
1727		2656
1728	=cut	2657	=cut
1729		2658
1730	1; # End of AnyEvent::Handle	2659	1
		2660

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