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Revision 1.187 by root, Tue Sep 8 00:01:12 2009 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 file handles via AnyEvent
16
17	=cut
18
19	our $VERSION = 4.233;
20		4
21	=head1 SYNOPSIS	5	=head1 SYNOPSIS
22		6
23	use AnyEvent;	7	use AnyEvent;
24	use AnyEvent::Handle;	8	use AnyEvent::Handle;
25		9
26	my $cv = AnyEvent->condvar;	10	my $cv = AnyEvent->condvar;
27		11
28	my $handle =	12	my $hdl; $hdl = new AnyEvent::Handle
29	AnyEvent::Handle->new (
30	fh => \*STDIN,	13	fh => \*STDIN,
31	on_eof => sub {	14	on_error => sub {
32	$cv->broadcast;	15	my ($hdl, $fatal, $msg) = @_;
33	},	16	warn "got error $msg\n";
		17	$hdl->destroy;
		18	$cv->send;
34	);	19	);
35		20
36	# send some request line	21	# send some request line
37	$handle->push_write ("getinfo\015\012");	22	$hdl->push_write ("getinfo\015\012");
38		23
39	# read the response line	24	# read the response line
40	$handle->push_read (line => sub {	25	$hdl->push_read (line => sub {
41	my ($handle, $line) = @_;	26	my ($hdl, $line) = @_;
42	warn "read line <$line>\n";	27	warn "got line <$line>\n";
43	$cv->send;	28	$cv->send;
44	});	29	});
45		30
46	$cv->recv;	31	$cv->recv;
47		32
48	=head1 DESCRIPTION	33	=head1 DESCRIPTION
49		34
50	This module is a helper module to make it easier to do event-based I/O on	35	This module is a helper module to make it easier to do event-based I/O on
51	filehandles. For utility functions for doing non-blocking connects and accepts	36	filehandles.
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, when the documentation refers to of "bytes" then this
58	means characters. As sysread and syswrite are used for all I/O, their	42	means characters. As sysread and syswrite are used for all I/O, their
59	treatment of characters applies to this module as well.	43	treatment of characters applies to this module as well.
60		44
		45	At the very minimum, you should specify C<fh> or C<connect>, and the
		46	C<on_error> callback.
		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
64	=head1 METHODS	80	=head1 METHODS
65		81
66	=over 4	82	=over 4
67		83
68	=item B<new (%args)>	84	=item $handle = B<new> AnyEvent::TLS fh => $filehandle, key => value...
69		85
70	The constructor supports these arguments (all as key => value pairs).	86	The constructor supports these arguments (all as C<< key => value >> pairs).
71		87
72	=over 4	88	=over 4
73		89
74	=item fh => $filehandle [MANDATORY]	90	=item fh => $filehandle [C<fh> or C<connect> MANDATORY]
75		91
76	The filehandle this L<AnyEvent::Handle> object will operate on.	92	The filehandle this L<AnyEvent::Handle> object will operate on.
77
78	NOTE: The filehandle will be set to non-blocking mode (using	93	NOTE: The filehandle will be set to non-blocking mode (using
79	C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in	94	C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in
80	that mode.	95	that mode.
81		96
		97	=item connect => [$host, $service] [C<fh> or C<connect> MANDATORY]
		98
		99	Try to connect to the specified host and service (port), using
		100	C<AnyEvent::Socket::tcp_connect>. The C<$host> additionally becomes the
		101	default C<peername>.
		102
		103	You have to specify either this parameter, or C<fh>, above.
		104
		105	It is possible to push requests on the read and write queues, and modify
		106	properties of the stream, even while AnyEvent::Handle is connecting.
		107
		108	When this parameter is specified, then the C<on_prepare>,
		109	C<on_connect_error> and C<on_connect> callbacks will be called under the
		110	appropriate circumstances:
		111
		112	=over 4
		113
82	=item on_eof => $cb->($handle)	114	=item on_prepare => $cb->($handle)
83		115
84	Set the callback to be called when an end-of-file condition is detected,	116	This (rarely used) callback is called before a new connection is
85	i.e. in the case of a socket, when the other side has closed the	117	attempted, but after the file handle has been created. It could be used to
86	connection cleanly.	118	prepare the file handle with parameters required for the actual connect
		119	(as opposed to settings that can be changed when the connection is already
		120	established).
87		121
88	For sockets, this just means that the other side has stopped sending data,	122	The return value of this callback should be the connect timeout value in
89	you can still try to write data, and, in fact, one can return from the eof	123	seconds (or C<0>, or C<undef>, or the empty list, to indicate the default
90	callback and continue writing data, as only the read part has been shut	124	timeout is to be used).
91	down.
92		125
93	While not mandatory, it is I<highly> recommended to set an eof callback,	126	=item on_connect => $cb->($handle, $host, $port, $retry->())
94	otherwise you might end up with a closed socket while you are still
95	waiting for data.
96		127
97	If an EOF condition has been detected but no C<on_eof> callback has been	128	This callback is called when a connection has been successfully established.
98	set, then a fatal error will be raised with C<$!> set to <0>.
99		129
		130	The actual numeric host and port (the socket peername) are passed as
		131	parameters, together with a retry callback.
		132
		133	When, for some reason, the handle is not acceptable, then calling
		134	C<$retry> will continue with the next connection target (in case of
		135	multi-homed hosts or SRV records there can be multiple connection
		136	endpoints). At the time it is called the read and write queues, eof
		137	status, tls status and similar properties of the handle will have been
		138	reset.
		139
		140	In most cases, ignoring the C<$retry> parameter is the way to go.
		141
		142	=item on_connect_error => $cb->($handle, $message)
		143
		144	This callback is called when the connection could not be
		145	established. C<$!> will contain the relevant error code, and C<$message> a
		146	message describing it (usually the same as C<"$!">).
		147
		148	If this callback isn't specified, then C<on_error> will be called with a
		149	fatal error instead.
		150
		151	=back
		152
100	=item on_error => $cb->($handle, $fatal)	153	=item on_error => $cb->($handle, $fatal, $message)
101		154
102	This is the error callback, which is called when, well, some error	155	This is the error callback, which is called when, well, some error
103	occured, such as not being able to resolve the hostname, failure to	156	occured, such as not being able to resolve the hostname, failure to
104	connect or a read error.	157	connect or a read error.
105		158
106	Some errors are fatal (which is indicated by C<$fatal> being true). On	159	Some errors are fatal (which is indicated by C<$fatal> being true). On
107	fatal errors the handle object will be shut down and will not be usable	160	fatal errors the handle object will be destroyed (by a call to C<< ->
108	(but you are free to look at the current C<< ->rbuf >>). Examples of fatal	161	destroy >>) after invoking the error callback (which means you are free to
109	errors are an EOF condition with active (but unsatisifable) read watchers	162	examine the handle object). Examples of fatal errors are an EOF condition
110	(C<EPIPE>) or I/O errors.	163	with active (but unsatisifable) read watchers (C<EPIPE>) or I/O errors. In
		164	cases where the other side can close the connection at their will it is
		165	often easiest to not report C<EPIPE> errors in this callback.
		166
		167	AnyEvent::Handle tries to find an appropriate error code for you to check
		168	against, but in some cases (TLS errors), this does not work well. It is
		169	recommended to always output the C<$message> argument in human-readable
		170	error messages (it's usually the same as C<"$!">).
111		171
112	Non-fatal errors can be retried by simply returning, but it is recommended	172	Non-fatal errors can be retried by simply returning, but it is recommended
113	to simply ignore this parameter and instead abondon the handle object	173	to simply ignore this parameter and instead abondon the handle object
114	when this callback is invoked. Examples of non-fatal errors are timeouts	174	when this callback is invoked. Examples of non-fatal errors are timeouts
115	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).	175	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
116		176
117	On callback entrance, the value of C<$!> contains the operating system	177	On callback entrance, the value of C<$!> contains the operating system
118	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).	178	error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or
		179	C<EPROTO>).
119		180
120	While not mandatory, it is I<highly> recommended to set this callback, as	181	While not mandatory, it is I<highly> recommended to set this callback, as
121	you will not be notified of errors otherwise. The default simply calls	182	you will not be notified of errors otherwise. The default simply calls
122	C<croak>.	183	C<croak>.
123		184
…		…
127	and no read request is in the queue (unlike read queue callbacks, this	188	and no read request is in the queue (unlike read queue callbacks, this
128	callback will only be called when at least one octet of data is in the	189	callback will only be called when at least one octet of data is in the
129	read buffer).	190	read buffer).
130		191
131	To access (and remove data from) the read buffer, use the C<< ->rbuf >>	192	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
132	method or access the C<$handle->{rbuf}> member directly.	193	method or access the C<< $handle->{rbuf} >> member directly. Note that you
		194	must not enlarge or modify the read buffer, you can only remove data at
		195	the beginning from it.
133		196
134	When an EOF condition is detected then AnyEvent::Handle will first try to	197	When an EOF condition is detected then AnyEvent::Handle will first try to
135	feed all the remaining data to the queued callbacks and C<on_read> before	198	feed all the remaining data to the queued callbacks and C<on_read> before
136	calling the C<on_eof> callback. If no progress can be made, then a fatal	199	calling the C<on_eof> callback. If no progress can be made, then a fatal
137	error will be raised (with C<$!> set to C<EPIPE>).	200	error will be raised (with C<$!> set to C<EPIPE>).
		201
		202	Note that, unlike requests in the read queue, an C<on_read> callback
		203	doesn't mean you I<require> some data: if there is an EOF and there
		204	are outstanding read requests then an error will be flagged. With an
		205	C<on_read> callback, the C<on_eof> callback will be invoked.
		206
		207	=item on_eof => $cb->($handle)
		208
		209	Set the callback to be called when an end-of-file condition is detected,
		210	i.e. in the case of a socket, when the other side has closed the
		211	connection cleanly, and there are no outstanding read requests in the
		212	queue (if there are read requests, then an EOF counts as an unexpected
		213	connection close and will be flagged as an error).
		214
		215	For sockets, this just means that the other side has stopped sending data,
		216	you can still try to write data, and, in fact, one can return from the EOF
		217	callback and continue writing data, as only the read part has been shut
		218	down.
		219
		220	If an EOF condition has been detected but no C<on_eof> callback has been
		221	set, then a fatal error will be raised with C<$!> set to <0>.
138		222
139	=item on_drain => $cb->($handle)	223	=item on_drain => $cb->($handle)
140		224
141	This sets the callback that is called when the write buffer becomes empty	225	This sets the callback that is called when the write buffer becomes empty
142	(or when the callback is set and the buffer is empty already).	226	(or when the callback is set and the buffer is empty already).
…		…
149	memory and push it into the queue, but instead only read more data from	233	memory and push it into the queue, but instead only read more data from
150	the file when the write queue becomes empty.	234	the file when the write queue becomes empty.
151		235
152	=item timeout => $fractional_seconds	236	=item timeout => $fractional_seconds
153		237
		238	=item rtimeout => $fractional_seconds
		239
		240	=item wtimeout => $fractional_seconds
		241
154	If non-zero, then this enables an "inactivity" timeout: whenever this many	242	If non-zero, then these enables an "inactivity" timeout: whenever this
155	seconds pass without a successful read or write on the underlying file	243	many seconds pass without a successful read or write on the underlying
156	handle, the C<on_timeout> callback will be invoked (and if that one is	244	file handle (or a call to C<timeout_reset>), the C<on_timeout> callback
157	missing, a non-fatal C<ETIMEDOUT> error will be raised).	245	will be invoked (and if that one is missing, a non-fatal C<ETIMEDOUT>
		246	error will be raised).
		247
		248	There are three variants of the timeouts that work fully independent
		249	of each other, for both read and write, just read, and just write:
		250	C<timeout>, C<rtimeout> and C<wtimeout>, with corresponding callbacks
		251	C<on_timeout>, C<on_rtimeout> and C<on_wtimeout>, and reset functions
		252	C<timeout_reset>, C<rtimeout_reset>, and C<wtimeout_reset>.
158		253
159	Note that timeout processing is also active when you currently do not have	254	Note that timeout processing is also active when you currently do not have
160	any outstanding read or write requests: If you plan to keep the connection	255	any outstanding read or write requests: If you plan to keep the connection
161	idle then you should disable the timout temporarily or ignore the timeout	256	idle then you should disable the timout temporarily or ignore the timeout
162	in the C<on_timeout> callback, in which case AnyEvent::Handle will simply	257	in the C<on_timeout> callback, in which case AnyEvent::Handle will simply
…		…
206	accomplishd by setting this option to a true value.	301	accomplishd by setting this option to a true value.
207		302
208	The default is your opertaing system's default behaviour (most likely	303	The default is your opertaing system's default behaviour (most likely
209	enabled), this option explicitly enables or disables it, if possible.	304	enabled), this option explicitly enables or disables it, if possible.
210		305
		306	=item keepalive => <boolean>
		307
		308	Enables (default disable) the SO_KEEPALIVE option on the stream socket:
		309	normally, TCP connections have no time-out once established, so TCP
		310	connections, once established, can stay alive forever even when the other
		311	side has long gone. TCP keepalives are a cheap way to take down long-lived
		312	TCP connections whent he other side becomes unreachable. While the default
		313	is OS-dependent, TCP keepalives usually kick in after around two hours,
		314	and, if the other side doesn't reply, take down the TCP connection some 10
		315	to 15 minutes later.
		316
		317	It is harmless to specify this option for file handles that do not support
		318	keepalives, and enabling it on connections that are potentially long-lived
		319	is usually a good idea.
		320
		321	=item oobinline => <boolean>
		322
		323	BSD majorly fucked up the implementation of TCP urgent data. The result
		324	is that almost no OS implements TCP according to the specs, and every OS
		325	implements it slightly differently.
		326
		327	If you want to handle TCP urgent data, then setting this flag (the default
		328	is enabled) gives you the most portable way of getting urgent data, by
		329	putting it into the stream.
		330
		331	Since BSD emulation of OOB data on top of TCP's urgent data can have
		332	security implications, AnyEvent::Handle sets this flag automatically
		333	unless explicitly specified. Note that setting this flag after
		334	establishing a connection I<may> be a bit too late (data loss could
		335	already have occured on BSD systems), but at least it will protect you
		336	from most attacks.
		337
211	=item read_size => <bytes>	338	=item read_size => <bytes>
212		339
213	The default read block size (the amount of bytes this module will	340	The default read block size (the amount of bytes this module will
214	try to read during each loop iteration, which affects memory	341	try to read during each loop iteration, which affects memory
215	requirements). Default: C<8192>.	342	requirements). Default: C<8192>.
…		…
232	write data and will install a watcher that will write this data to the	359	write data and will install a watcher that will write this data to the
233	socket. No errors will be reported (this mostly matches how the operating	360	socket. No errors will be reported (this mostly matches how the operating
234	system treats outstanding data at socket close time).	361	system treats outstanding data at socket close time).
235		362
236	This will not work for partial TLS data that could not be encoded	363	This will not work for partial TLS data that could not be encoded
237	yet. This data will be lost.	364	yet. This data will be lost. Calling the C<stoptls> method in time might
		365	help.
		366
		367	=item peername => $string
		368
		369	A string used to identify the remote site - usually the DNS hostname
		370	(I<not> IDN!) used to create the connection, rarely the IP address.
		371
		372	Apart from being useful in error messages, this string is also used in TLS
		373	peername verification (see C<verify_peername> in L<AnyEvent::TLS>). This
		374	verification will be skipped when C<peername> is not specified or
		375	C<undef>.
238		376
239	=item tls => "accept" | "connect" | Net::SSLeay::SSL object	377	=item tls => "accept" | "connect" | Net::SSLeay::SSL object
240		378
241	When this parameter is given, it enables TLS (SSL) mode, that means	379	When this parameter is given, it enables TLS (SSL) mode, that means
242	AnyEvent will start a TLS handshake as soon as the conenction has been	380	AnyEvent will start a TLS handshake as soon as the connection has been
243	established and will transparently encrypt/decrypt data afterwards.	381	established and will transparently encrypt/decrypt data afterwards.
		382
		383	All TLS protocol errors will be signalled as C<EPROTO>, with an
		384	appropriate error message.
244		385
245	TLS mode requires Net::SSLeay to be installed (it will be loaded	386	TLS mode requires Net::SSLeay to be installed (it will be loaded
246	automatically when you try to create a TLS handle): this module doesn't	387	automatically when you try to create a TLS handle): this module doesn't
247	have a dependency on that module, so if your module requires it, you have	388	have a dependency on that module, so if your module requires it, you have
248	to add the dependency yourself.	389	to add the dependency yourself.
…		…
252	mode.	393	mode.
253		394
254	You can also provide your own TLS connection object, but you have	395	You can also provide your own TLS connection object, but you have
255	to make sure that you call either C<Net::SSLeay::set_connect_state>	396	to make sure that you call either C<Net::SSLeay::set_connect_state>
256	or C<Net::SSLeay::set_accept_state> on it before you pass it to	397	or C<Net::SSLeay::set_accept_state> on it before you pass it to
257	AnyEvent::Handle.	398	AnyEvent::Handle. Also, this module will take ownership of this connection
		399	object.
		400
		401	At some future point, AnyEvent::Handle might switch to another TLS
		402	implementation, then the option to use your own session object will go
		403	away.
		404
		405	B<IMPORTANT:> since Net::SSLeay "objects" are really only integers,
		406	passing in the wrong integer will lead to certain crash. This most often
		407	happens when one uses a stylish C<< tls => 1 >> and is surprised about the
		408	segmentation fault.
258		409
259	See the C<< ->starttls >> method for when need to start TLS negotiation later.	410	See the C<< ->starttls >> method for when need to start TLS negotiation later.
260		411
261	=item tls_ctx => $ssl_ctx	412	=item tls_ctx => $anyevent_tls
262		413
263	Use the given C<Net::SSLeay::CTX> object to create the new TLS connection	414	Use the given C<AnyEvent::TLS> object to create the new TLS connection
264	(unless a connection object was specified directly). If this parameter is	415	(unless a connection object was specified directly). If this parameter is
265	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	416	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
		417
		418	Instead of an object, you can also specify a hash reference with C<< key
		419	=> value >> pairs. Those will be passed to L<AnyEvent::TLS> to create a
		420	new TLS context object.
		421
		422	=item on_starttls => $cb->($handle, $success[, $error_message])
		423
		424	This callback will be invoked when the TLS/SSL handshake has finished. If
		425	C<$success> is true, then the TLS handshake succeeded, otherwise it failed
		426	(C<on_stoptls> will not be called in this case).
		427
		428	The session in C<< $handle->{tls} >> can still be examined in this
		429	callback, even when the handshake was not successful.
		430
		431	TLS handshake failures will not cause C<on_error> to be invoked when this
		432	callback is in effect, instead, the error message will be passed to C<on_starttls>.
		433
		434	Without this callback, handshake failures lead to C<on_error> being
		435	called, as normal.
		436
		437	Note that you cannot call C<starttls> right again in this callback. If you
		438	need to do that, start an zero-second timer instead whose callback can
		439	then call C<< ->starttls >> again.
		440
		441	=item on_stoptls => $cb->($handle)
		442
		443	When a SSLv3/TLS shutdown/close notify/EOF is detected and this callback is
		444	set, then it will be invoked after freeing the TLS session. If it is not,
		445	then a TLS shutdown condition will be treated like a normal EOF condition
		446	on the handle.
		447
		448	The session in C<< $handle->{tls} >> can still be examined in this
		449	callback.
		450
		451	This callback will only be called on TLS shutdowns, not when the
		452	underlying handle signals EOF.
266		453
267	=item json => JSON or JSON::XS object	454	=item json => JSON or JSON::XS object
268		455
269	This is the json coder object used by the C<json> read and write types.	456	This is the json coder object used by the C<json> read and write types.
270		457
…		…
273	texts.	460	texts.
274		461
275	Note that you are responsible to depend on the JSON module if you want to	462	Note that you are responsible to depend on the JSON module if you want to
276	use this functionality, as AnyEvent does not have a dependency itself.	463	use this functionality, as AnyEvent does not have a dependency itself.
277		464
278	=item filter_r => $cb
279
280	=item filter_w => $cb
281
282	These exist, but are undocumented at this time. (They are used internally
283	by the TLS code).
284
285	=back	465	=back
286		466
287	=cut	467	=cut
288		468
289	sub new {	469	sub new {
290	my $class = shift;	470	my $class = shift;
291
292	my $self = bless { @_ }, $class;	471	my $self = bless { @_ }, $class;
293		472
294	$self->{fh} or Carp::croak "mandatory argument fh is missing";	473	if ($self->{fh}) {
		474	$self->_start;
		475	return unless $self->{fh}; # could be gone by now
		476
		477	} elsif ($self->{connect}) {
		478	require AnyEvent::Socket;
		479
		480	$self->{peername} = $self->{connect}[0]
		481	unless exists $self->{peername};
		482
		483	$self->{_skip_drain_rbuf} = 1;
		484
		485	{
		486	Scalar::Util::weaken (my $self = $self);
		487
		488	$self->{_connect} =
		489	AnyEvent::Socket::tcp_connect (
		490	$self->{connect}[0],
		491	$self->{connect}[1],
		492	sub {
		493	my ($fh, $host, $port, $retry) = @_;
		494
		495	if ($fh) {
		496	$self->{fh} = $fh;
		497
		498	delete $self->{_skip_drain_rbuf};
		499	$self->_start;
		500
		501	$self->{on_connect}
		502	and $self->{on_connect}($self, $host, $port, sub {
		503	delete @$self{qw(fh _tw _rtw _wtw _ww _rw _eof _queue rbuf _wbuf tls _tls_rbuf _tls_wbuf)};
		504	$self->{_skip_drain_rbuf} = 1;
		505	&$retry;
		506	});
		507
		508	} else {
		509	if ($self->{on_connect_error}) {
		510	$self->{on_connect_error}($self, "$!");
		511	$self->destroy;
		512	} else {
		513	$self->_error ($!, 1);
		514	}
		515	}
		516	},
		517	sub {
		518	local $self->{fh} = $_[0];
		519
		520	$self->{on_prepare}
		521	? $self->{on_prepare}->($self)
		522	: ()
		523	}
		524	);
		525	}
		526
		527	} else {
		528	Carp::croak "AnyEvent::Handle: either an existing fh or the connect parameter must be specified";
		529	}
		530
		531	$self
		532	}
		533
		534	sub _start {
		535	my ($self) = @_;
295		536
296	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	537	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
297		538
298	if ($self->{tls}) {	539	$self->{_activity} =
299	require Net::SSLeay;	540	$self->{_ractivity} =
		541	$self->{_wactivity} = AE::now;
		542
		543	$self->timeout (delete $self->{timeout} ) if $self->{timeout};
		544	$self->rtimeout (delete $self->{rtimeout} ) if $self->{rtimeout};
		545	$self->wtimeout (delete $self->{wtimeout} ) if $self->{wtimeout};
		546
		547	$self->no_delay (delete $self->{no_delay} ) if exists $self->{no_delay} && $self->{no_delay};
		548	$self->keepalive (delete $self->{keepalive}) if exists $self->{keepalive} && $self->{keepalive};
		549
		550	$self->oobinline (exists $self->{oobinline} ? delete $self->{oobinline} : 1);
		551
300	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});	552	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})
301	}	553	if $self->{tls};
302		554
303	$self->{_activity} = AnyEvent->now;
304	$self->_timeout;
305
306	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};	555	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};
307	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};
308		556
309	$self->start_read	557	$self->start_read
310	if $self->{on_read};	558	if $self->{on_read} || @{ $self->{_queue} };
311		559
312	$self	560	$self->_drain_wbuf;
313	}
314
315	sub _shutdown {
316	my ($self) = @_;
317
318	delete $self->{_tw};
319	delete $self->{_rw};
320	delete $self->{_ww};
321	delete $self->{fh};
322
323	$self->stoptls;
324
325	delete $self->{on_read};
326	delete $self->{_queue};
327	}	561	}
328		562
329	sub _error {	563	sub _error {
330	my ($self, $errno, $fatal) = @_;	564	my ($self, $errno, $fatal, $message) = @_;
331
332	$self->_shutdown
333	if $fatal;
334		565
335	$! = $errno;	566	$! = $errno;
		567	$message ||= "$!";
336		568
337	if ($self->{on_error}) {	569	if ($self->{on_error}) {
338	$self->{on_error}($self, $fatal);	570	$self->{on_error}($self, $fatal, $message);
339	} else {	571	$self->destroy if $fatal;
		572	} elsif ($self->{fh} || $self->{connect}) {
		573	$self->destroy;
340	Carp::croak "AnyEvent::Handle uncaught error: $!";	574	Carp::croak "AnyEvent::Handle uncaught error: $message";
341	}	575	}
342	}	576	}
343		577
344	=item $fh = $handle->fh	578	=item $fh = $handle->fh
345		579
…		…
369	$_[0]{on_eof} = $_[1];	603	$_[0]{on_eof} = $_[1];
370	}	604	}
371		605
372	=item $handle->on_timeout ($cb)	606	=item $handle->on_timeout ($cb)
373		607
374	Replace the current C<on_timeout> callback, or disables the callback (but	608	=item $handle->on_rtimeout ($cb)
375	not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor
376	argument and method.
377		609
378	=cut	610	=item $handle->on_wtimeout ($cb)
379		611
380	sub on_timeout {	612	Replace the current C<on_timeout>, C<on_rtimeout> or C<on_wtimeout>
381	$_[0]{on_timeout} = $_[1];	613	callback, or disables the callback (but not the timeout) if C<$cb> =
382	}	614	C<undef>. See the C<timeout> constructor argument and method.
		615
		616	=cut
		617
		618	# see below
383		619
384	=item $handle->autocork ($boolean)	620	=item $handle->autocork ($boolean)
385		621
386	Enables or disables the current autocork behaviour (see C<autocork>	622	Enables or disables the current autocork behaviour (see C<autocork>
387	constructor argument).	623	constructor argument). Changes will only take effect on the next write.
388		624
389	=cut	625	=cut
		626
		627	sub autocork {
		628	$_[0]{autocork} = $_[1];
		629	}
390		630
391	=item $handle->no_delay ($boolean)	631	=item $handle->no_delay ($boolean)
392		632
393	Enables or disables the C<no_delay> setting (see constructor argument of	633	Enables or disables the C<no_delay> setting (see constructor argument of
394	the same name for details).	634	the same name for details).
…		…
398	sub no_delay {	638	sub no_delay {
399	$_[0]{no_delay} = $_[1];	639	$_[0]{no_delay} = $_[1];
400		640
401	eval {	641	eval {
402	local $SIG{__DIE__};	642	local $SIG{__DIE__};
403	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1];	643	setsockopt $_[0]{fh}, Socket::IPPROTO_TCP (), Socket::TCP_NODELAY (), int $_[1]
		644	if $_[0]{fh};
404	};	645	};
405	}	646	}
406		647
		648	=item $handle->keepalive ($boolean)
		649
		650	Enables or disables the C<keepalive> setting (see constructor argument of
		651	the same name for details).
		652
		653	=cut
		654
		655	sub keepalive {
		656	$_[0]{keepalive} = $_[1];
		657
		658	eval {
		659	local $SIG{__DIE__};
		660	setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_KEEPALIVE (), int $_[1]
		661	if $_[0]{fh};
		662	};
		663	}
		664
		665	=item $handle->oobinline ($boolean)
		666
		667	Enables or disables the C<oobinline> setting (see constructor argument of
		668	the same name for details).
		669
		670	=cut
		671
		672	sub oobinline {
		673	$_[0]{oobinline} = $_[1];
		674
		675	eval {
		676	local $SIG{__DIE__};
		677	setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_OOBINLINE (), int $_[1]
		678	if $_[0]{fh};
		679	};
		680	}
		681
		682	=item $handle->keepalive ($boolean)
		683
		684	Enables or disables the C<keepalive> setting (see constructor argument of
		685	the same name for details).
		686
		687	=cut
		688
		689	sub keepalive {
		690	$_[0]{keepalive} = $_[1];
		691
		692	eval {
		693	local $SIG{__DIE__};
		694	setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_KEEPALIVE (), int $_[1]
		695	if $_[0]{fh};
		696	};
		697	}
		698
		699	=item $handle->on_starttls ($cb)
		700
		701	Replace the current C<on_starttls> callback (see the C<on_starttls> constructor argument).
		702
		703	=cut
		704
		705	sub on_starttls {
		706	$_[0]{on_starttls} = $_[1];
		707	}
		708
		709	=item $handle->on_stoptls ($cb)
		710
		711	Replace the current C<on_stoptls> callback (see the C<on_stoptls> constructor argument).
		712
		713	=cut
		714
		715	sub on_starttls {
		716	$_[0]{on_stoptls} = $_[1];
		717	}
		718
		719	=item $handle->rbuf_max ($max_octets)
		720
		721	Configures the C<rbuf_max> setting (C<undef> disables it).
		722
		723	=cut
		724
		725	sub rbuf_max {
		726	$_[0]{rbuf_max} = $_[1];
		727	}
		728
407	#############################################################################	729	#############################################################################
408		730
409	=item $handle->timeout ($seconds)	731	=item $handle->timeout ($seconds)
410		732
		733	=item $handle->rtimeout ($seconds)
		734
		735	=item $handle->wtimeout ($seconds)
		736
411	Configures (or disables) the inactivity timeout.	737	Configures (or disables) the inactivity timeout.
412		738
413	=cut	739	=item $handle->timeout_reset
414		740
415	sub timeout {	741	=item $handle->rtimeout_reset
		742
		743	=item $handle->wtimeout_reset
		744
		745	Reset the activity timeout, as if data was received or sent.
		746
		747	These methods are cheap to call.
		748
		749	=cut
		750
		751	for my $dir ("", "r", "w") {
		752	my $timeout = "${dir}timeout";
		753	my $tw = "_${dir}tw";
		754	my $on_timeout = "on_${dir}timeout";
		755	my $activity = "_${dir}activity";
		756	my $cb;
		757
		758	*$on_timeout = sub {
		759	$_[0]{$on_timeout} = $_[1];
		760	};
		761
		762	*$timeout = sub {
416	my ($self, $timeout) = @_;	763	my ($self, $new_value) = @_;
417		764
418	$self->{timeout} = $timeout;	765	$self->{$timeout} = $new_value;
419	$self->_timeout;	766	delete $self->{$tw}; &$cb;
420	}	767	};
421		768
		769	*{"${dir}timeout_reset"} = sub {
		770	$_[0]{$activity} = AE::now;
		771	};
		772
		773	# main workhorse:
422	# reset the timeout watcher, as neccessary	774	# reset the timeout watcher, as neccessary
423	# also check for time-outs	775	# also check for time-outs
424	sub _timeout {	776	$cb = sub {
425	my ($self) = @_;	777	my ($self) = @_;
426		778
427	if ($self->{timeout}) {	779	if ($self->{$timeout} && $self->{fh}) {
428	my $NOW = AnyEvent->now;	780	my $NOW = AE::now;
429		781
430	# when would the timeout trigger?	782	# when would the timeout trigger?
431	my $after = $self->{_activity} + $self->{timeout} - $NOW;	783	my $after = $self->{$activity} + $self->{$timeout} - $NOW;
432		784
433	# now or in the past already?	785	# now or in the past already?
434	if ($after <= 0) {	786	if ($after <= 0) {
435	$self->{_activity} = $NOW;	787	$self->{$activity} = $NOW;
436		788
437	if ($self->{on_timeout}) {	789	if ($self->{$on_timeout}) {
438	$self->{on_timeout}($self);	790	$self->{$on_timeout}($self);
439	} else {	791	} else {
440	$self->_error (&Errno::ETIMEDOUT);	792	$self->_error (Errno::ETIMEDOUT);
		793	}
		794
		795	# callback could have changed timeout value, optimise
		796	return unless $self->{$timeout};
		797
		798	# calculate new after
		799	$after = $self->{$timeout};
441	}	800	}
442		801
443	# callback could have changed timeout value, optimise	802	Scalar::Util::weaken $self;
444	return unless $self->{timeout};	803	return unless $self; # ->error could have destroyed $self
445		804
446	# calculate new after	805	$self->{$tw} ||= AE::timer $after, 0, sub {
447	$after = $self->{timeout};	806	delete $self->{$tw};
		807	$cb->($self);
		808	};
		809	} else {
		810	delete $self->{$tw};
448	}	811	}
449
450	Scalar::Util::weaken $self;
451	return unless $self; # ->error could have destroyed $self
452
453	$self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub {
454	delete $self->{_tw};
455	$self->_timeout;
456	});
457	} else {
458	delete $self->{_tw};
459	}	812	}
460	}	813	}
461		814
462	#############################################################################	815	#############################################################################
463		816
…		…
487	my ($self, $cb) = @_;	840	my ($self, $cb) = @_;
488		841
489	$self->{on_drain} = $cb;	842	$self->{on_drain} = $cb;
490		843
491	$cb->($self)	844	$cb->($self)
492	if $cb && $self->{low_water_mark} >= length $self->{wbuf};	845	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});
493	}	846	}
494		847
495	=item $handle->push_write ($data)	848	=item $handle->push_write ($data)
496		849
497	Queues the given scalar to be written. You can push as much data as you	850	Queues the given scalar to be written. You can push as much data as you
…		…
508	Scalar::Util::weaken $self;	861	Scalar::Util::weaken $self;
509		862
510	my $cb = sub {	863	my $cb = sub {
511	my $len = syswrite $self->{fh}, $self->{wbuf};	864	my $len = syswrite $self->{fh}, $self->{wbuf};
512		865
513	if ($len >= 0) {	866	if (defined $len) {
514	substr $self->{wbuf}, 0, $len, "";	867	substr $self->{wbuf}, 0, $len, "";
515		868
516	$self->{_activity} = AnyEvent->now;	869	$self->{_activity} = $self->{_wactivity} = AE::now;
517		870
518	$self->{on_drain}($self)	871	$self->{on_drain}($self)
519	if $self->{low_water_mark} >= length $self->{wbuf}	872	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
520	&& $self->{on_drain};	873	&& $self->{on_drain};
521		874
522	delete $self->{_ww} unless length $self->{wbuf};	875	delete $self->{_ww} unless length $self->{wbuf};
523	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	876	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
524	$self->_error ($!, 1);	877	$self->_error ($!, 1);
…		…
527		880
528	# try to write data immediately	881	# try to write data immediately
529	$cb->() unless $self->{autocork};	882	$cb->() unless $self->{autocork};
530		883
531	# if still data left in wbuf, we need to poll	884	# if still data left in wbuf, we need to poll
532	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)	885	$self->{_ww} = AE::io $self->{fh}, 1, $cb
533	if length $self->{wbuf};	886	if length $self->{wbuf};
534	};	887	};
535	}	888	}
536		889
537	our %WH;	890	our %WH;
538		891
		892	# deprecated
539	sub register_write_type($$) {	893	sub register_write_type($$) {
540	$WH{$_[0]} = $_[1];	894	$WH{$_[0]} = $_[1];
541	}	895	}
542		896
543	sub push_write {	897	sub push_write {
544	my $self = shift;	898	my $self = shift;
545		899
546	if (@_ > 1) {	900	if (@_ > 1) {
547	my $type = shift;	901	my $type = shift;
548		902
		903	@_ = ($WH{$type} ||= _load_func "$type\::anyevent_write_type"
549	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")	904	or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::push_write")
550	->($self, @_);	905	->($self, @_);
551	}	906	}
552		907
553	if ($self->{filter_w}) {	908	if ($self->{tls}) {
554	$self->{filter_w}($self, \$_[0]);	909	$self->{_tls_wbuf} .= $_[0];
		910	&_dotls ($self) if $self->{fh};
555	} else {	911	} else {
556	$self->{wbuf} .= $_[0];	912	$self->{wbuf} .= $_[0];
557	$self->_drain_wbuf;	913	$self->_drain_wbuf if $self->{fh};
558	}	914	}
559	}	915	}
560		916
561	=item $handle->push_write (type => @args)	917	=item $handle->push_write (type => @args)
562		918
563	Instead of formatting your data yourself, you can also let this module do	919	Instead of formatting your data yourself, you can also let this module
564	the job by specifying a type and type-specific arguments.	920	do the job by specifying a type and type-specific arguments. You
		921	can also specify the (fully qualified) name of a package, in which
		922	case AnyEvent tries to load the package and then expects to find the
		923	C<anyevent_read_type> function inside (see "custom write types", below).
565		924
566	Predefined types are (if you have ideas for additional types, feel free to	925	Predefined types are (if you have ideas for additional types, feel free to
567	drop by and tell us):	926	drop by and tell us):
568		927
569	=over 4	928	=over 4
…		…
576	=cut	935	=cut
577		936
578	register_write_type netstring => sub {	937	register_write_type netstring => sub {
579	my ($self, $string) = @_;	938	my ($self, $string) = @_;
580		939
581	sprintf "%d:%s,", (length $string), $string	940	(length $string) . ":$string,"
582	};	941	};
583		942
584	=item packstring => $format, $data	943	=item packstring => $format, $data
585		944
586	An octet string prefixed with an encoded length. The encoding C<$format>	945	An octet string prefixed with an encoded length. The encoding C<$format>
…		…
626	Other languages could read single lines terminated by a newline and pass	985	Other languages could read single lines terminated by a newline and pass
627	this line into their JSON decoder of choice.	986	this line into their JSON decoder of choice.
628		987
629	=cut	988	=cut
630		989
		990	sub json_coder() {
		991	eval { require JSON::XS; JSON::XS->new->utf8 }
		992	|| do { require JSON; JSON->new->utf8 }
		993	}
		994
631	register_write_type json => sub {	995	register_write_type json => sub {
632	my ($self, $ref) = @_;	996	my ($self, $ref) = @_;
633		997
634	require JSON;	998	my $json = $self->{json} ||= json_coder;
635		999
636	$self->{json} ? $self->{json}->encode ($ref)	1000	$json->encode ($ref)
637	: JSON::encode_json ($ref)
638	};	1001	};
639		1002
640	=item storable => $reference	1003	=item storable => $reference
641		1004
642	Freezes the given reference using L<Storable> and writes it to the	1005	Freezes the given reference using L<Storable> and writes it to the
…		…
652	pack "w/a*", Storable::nfreeze ($ref)	1015	pack "w/a*", Storable::nfreeze ($ref)
653	};	1016	};
654		1017
655	=back	1018	=back
656		1019
657	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)	1020	=item $handle->push_shutdown
658		1021
659	This function (not method) lets you add your own types to C<push_write>.	1022	Sometimes you know you want to close the socket after writing your data
		1023	before it was actually written. One way to do that is to replace your
		1024	C<on_drain> handler by a callback that shuts down the socket (and set
		1025	C<low_water_mark> to C<0>). This method is a shorthand for just that, and
		1026	replaces the C<on_drain> callback with:
		1027
		1028	sub { shutdown $_[0]{fh}, 1 } # for push_shutdown
		1029
		1030	This simply shuts down the write side and signals an EOF condition to the
		1031	the peer.
		1032
		1033	You can rely on the normal read queue and C<on_eof> handling
		1034	afterwards. This is the cleanest way to close a connection.
		1035
		1036	=cut
		1037
		1038	sub push_shutdown {
		1039	my ($self) = @_;
		1040
		1041	delete $self->{low_water_mark};
		1042	$self->on_drain (sub { shutdown $_[0]{fh}, 1 });
		1043	}
		1044
		1045	=item custom write types - Package::anyevent_write_type $handle, @args
		1046
		1047	Instead of one of the predefined types, you can also specify the name of
		1048	a package. AnyEvent will try to load the package and then expects to find
		1049	a function named C<anyevent_write_type> inside. If it isn't found, it
		1050	progressively tries to load the parent package until it either finds the
		1051	function (good) or runs out of packages (bad).
		1052
660	Whenever the given C<type> is used, C<push_write> will invoke the code	1053	Whenever the given C<type> is used, C<push_write> will the function with
661	reference with the handle object and the remaining arguments.	1054	the handle object and the remaining arguments.
662		1055
663	The code reference is supposed to return a single octet string that will	1056	The function is supposed to return a single octet string that will be
664	be appended to the write buffer.	1057	appended to the write buffer, so you cna mentally treat this function as a
		1058	"arguments to on-the-wire-format" converter.
665		1059
666	Note that this is a function, and all types registered this way will be	1060	Example: implement a custom write type C<join> that joins the remaining
667	global, so try to use unique names.	1061	arguments using the first one.
		1062
		1063	$handle->push_write (My::Type => " ", 1,2,3);
		1064
		1065	# uses the following package, which can be defined in the "My::Type" or in
		1066	# the "My" modules to be auto-loaded, or just about anywhere when the
		1067	# My::Type::anyevent_write_type is defined before invoking it.
		1068
		1069	package My::Type;
		1070
		1071	sub anyevent_write_type {
		1072	my ($handle, $delim, @args) = @_;
		1073
		1074	join $delim, @args
		1075	}
668		1076
669	=cut	1077	=cut
670		1078
671	#############################################################################	1079	#############################################################################
672		1080
…		…
754	=cut	1162	=cut
755		1163
756	sub _drain_rbuf {	1164	sub _drain_rbuf {
757	my ($self) = @_;	1165	my ($self) = @_;
758		1166
		1167	# avoid recursion
		1168	return if $self->{_skip_drain_rbuf};
759	local $self->{_in_drain} = 1;	1169	local $self->{_skip_drain_rbuf} = 1;
760
761	if (
762	defined $self->{rbuf_max}
763	&& $self->{rbuf_max} < length $self->{rbuf}
764	) {
765	$self->_error (&Errno::ENOSPC, 1), return;
766	}
767		1170
768	while () {	1171	while () {
		1172	# we need to use a separate tls read buffer, as we must not receive data while
		1173	# we are draining the buffer, and this can only happen with TLS.
		1174	$self->{rbuf} .= delete $self->{_tls_rbuf}
		1175	if exists $self->{_tls_rbuf};
		1176
769	my $len = length $self->{rbuf};	1177	my $len = length $self->{rbuf};
770		1178
771	if (my $cb = shift @{ $self->{_queue} }) {	1179	if (my $cb = shift @{ $self->{_queue} }) {
772	unless ($cb->($self)) {	1180	unless ($cb->($self)) {
773	if ($self->{_eof}) {	1181	# no progress can be made
774	# no progress can be made (not enough data and no data forthcoming)	1182	# (not enough data and no data forthcoming)
775	$self->_error (&Errno::EPIPE, 1), return;	1183	$self->_error (Errno::EPIPE, 1), return
776	}	1184	if $self->{_eof};
777		1185
778	unshift @{ $self->{_queue} }, $cb;	1186	unshift @{ $self->{_queue} }, $cb;
779	last;	1187	last;
780	}	1188	}
781	} elsif ($self->{on_read}) {	1189	} elsif ($self->{on_read}) {
…		…
788	&& !@{ $self->{_queue} } # and the queue is still empty	1196	&& !@{ $self->{_queue} } # and the queue is still empty
789	&& $self->{on_read} # but we still have on_read	1197	&& $self->{on_read} # but we still have on_read
790	) {	1198	) {
791	# no further data will arrive	1199	# no further data will arrive
792	# so no progress can be made	1200	# so no progress can be made
793	$self->_error (&Errno::EPIPE, 1), return	1201	$self->_error (Errno::EPIPE, 1), return
794	if $self->{_eof};	1202	if $self->{_eof};
795		1203
796	last; # more data might arrive	1204	last; # more data might arrive
797	}	1205	}
798	} else {	1206	} else {
799	# read side becomes idle	1207	# read side becomes idle
800	delete $self->{_rw};	1208	delete $self->{_rw} unless $self->{tls};
801	last;	1209	last;
802	}	1210	}
803	}	1211	}
804		1212
805	if ($self->{_eof}) {	1213	if ($self->{_eof}) {
806	if ($self->{on_eof}) {	1214	$self->{on_eof}
807	$self->{on_eof}($self)	1215	? $self->{on_eof}($self)
808	} else {	1216	: $self->_error (0, 1, "Unexpected end-of-file");
809	$self->_error (0, 1);	1217
810	}	1218	return;
		1219	}
		1220
		1221	if (
		1222	defined $self->{rbuf_max}
		1223	&& $self->{rbuf_max} < length $self->{rbuf}
		1224	) {
		1225	$self->_error (Errno::ENOSPC, 1), return;
811	}	1226	}
812		1227
813	# may need to restart read watcher	1228	# may need to restart read watcher
814	unless ($self->{_rw}) {	1229	unless ($self->{_rw}) {
815	$self->start_read	1230	$self->start_read
…		…
827		1242
828	sub on_read {	1243	sub on_read {
829	my ($self, $cb) = @_;	1244	my ($self, $cb) = @_;
830		1245
831	$self->{on_read} = $cb;	1246	$self->{on_read} = $cb;
832	$self->_drain_rbuf if $cb && !$self->{_in_drain};	1247	$self->_drain_rbuf if $cb;
833	}	1248	}
834		1249
835	=item $handle->rbuf	1250	=item $handle->rbuf
836		1251
837	Returns the read buffer (as a modifiable lvalue).	1252	Returns the read buffer (as a modifiable lvalue).
838		1253
839	You can access the read buffer directly as the C<< ->{rbuf} >> member, if	1254	You can access the read buffer directly as the C<< ->{rbuf} >>
840	you want.	1255	member, if you want. However, the only operation allowed on the
		1256	read buffer (apart from looking at it) is removing data from its
		1257	beginning. Otherwise modifying or appending to it is not allowed and will
		1258	lead to hard-to-track-down bugs.
841		1259
842	NOTE: The read buffer should only be used or modified if the C<on_read>,	1260	NOTE: The read buffer should only be used or modified if the C<on_read>,
843	C<push_read> or C<unshift_read> methods are used. The other read methods	1261	C<push_read> or C<unshift_read> methods are used. The other read methods
844	automatically manage the read buffer.	1262	automatically manage the read buffer.
845		1263
…		…
881	my $cb = pop;	1299	my $cb = pop;
882		1300
883	if (@_) {	1301	if (@_) {
884	my $type = shift;	1302	my $type = shift;
885		1303
		1304	$cb = ($RH{$type} ||= _load_func "$type\::anyevent_read_type"
886	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")	1305	or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::push_read")
887	->($self, $cb, @_);	1306	->($self, $cb, @_);
888	}	1307	}
889		1308
890	push @{ $self->{_queue} }, $cb;	1309	push @{ $self->{_queue} }, $cb;
891	$self->_drain_rbuf unless $self->{_in_drain};	1310	$self->_drain_rbuf;
892	}	1311	}
893		1312
894	sub unshift_read {	1313	sub unshift_read {
895	my $self = shift;	1314	my $self = shift;
896	my $cb = pop;	1315	my $cb = pop;
…		…
900		1319
901	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read")	1320	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read")
902	->($self, $cb, @_);	1321	->($self, $cb, @_);
903	}	1322	}
904		1323
905
906	unshift @{ $self->{_queue} }, $cb;	1324	unshift @{ $self->{_queue} }, $cb;
907	$self->_drain_rbuf unless $self->{_in_drain};	1325	$self->_drain_rbuf;
908	}	1326	}
909		1327
910	=item $handle->push_read (type => @args, $cb)	1328	=item $handle->push_read (type => @args, $cb)
911		1329
912	=item $handle->unshift_read (type => @args, $cb)	1330	=item $handle->unshift_read (type => @args, $cb)
913		1331
914	Instead of providing a callback that parses the data itself you can chose	1332	Instead of providing a callback that parses the data itself you can chose
915	between a number of predefined parsing formats, for chunks of data, lines	1333	between a number of predefined parsing formats, for chunks of data, lines
916	etc.	1334	etc. You can also specify the (fully qualified) name of a package, in
		1335	which case AnyEvent tries to load the package and then expects to find the
		1336	C<anyevent_read_type> function inside (see "custom read types", below).
917		1337
918	Predefined types are (if you have ideas for additional types, feel free to	1338	Predefined types are (if you have ideas for additional types, feel free to
919	drop by and tell us):	1339	drop by and tell us):
920		1340
921	=over 4	1341	=over 4
…		…
1045	return 1;	1465	return 1;
1046	}	1466	}
1047		1467
1048	# reject	1468	# reject
1049	if ($reject && $$rbuf =~ $reject) {	1469	if ($reject && $$rbuf =~ $reject) {
1050	$self->_error (&Errno::EBADMSG);	1470	$self->_error (Errno::EBADMSG);
1051	}	1471	}
1052		1472
1053	# skip	1473	# skip
1054	if ($skip && $$rbuf =~ $skip) {	1474	if ($skip && $$rbuf =~ $skip) {
1055	$data .= substr $$rbuf, 0, $+[0], "";	1475	$data .= substr $$rbuf, 0, $+[0], "";
…		…
1071	my ($self, $cb) = @_;	1491	my ($self, $cb) = @_;
1072		1492
1073	sub {	1493	sub {
1074	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {	1494	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {
1075	if ($_[0]{rbuf} =~ /[^0-9]/) {	1495	if ($_[0]{rbuf} =~ /[^0-9]/) {
1076	$self->_error (&Errno::EBADMSG);	1496	$self->_error (Errno::EBADMSG);
1077	}	1497	}
1078	return;	1498	return;
1079	}	1499	}
1080		1500
1081	my $len = $1;	1501	my $len = $1;
…		…
1084	my $string = $_[1];	1504	my $string = $_[1];
1085	$_[0]->unshift_read (chunk => 1, sub {	1505	$_[0]->unshift_read (chunk => 1, sub {
1086	if ($_[1] eq ",") {	1506	if ($_[1] eq ",") {
1087	$cb->($_[0], $string);	1507	$cb->($_[0], $string);
1088	} else {	1508	} else {
1089	$self->_error (&Errno::EBADMSG);	1509	$self->_error (Errno::EBADMSG);
1090	}	1510	}
1091	});	1511	});
1092	});	1512	});
1093		1513
1094	1	1514	1
…		…
1100	An octet string prefixed with an encoded length. The encoding C<$format>	1520	An octet string prefixed with an encoded length. The encoding C<$format>
1101	uses the same format as a Perl C<pack> format, but must specify a single	1521	uses the same format as a Perl C<pack> format, but must specify a single
1102	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an	1522	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
1103	optional C<!>, C<< < >> or C<< > >> modifier).	1523	optional C<!>, C<< < >> or C<< > >> modifier).
1104		1524
1105	DNS over TCP uses a prefix of C<n>, EPP uses a prefix of C<N>.	1525	For example, DNS over TCP uses a prefix of C<n> (2 octet network order),
		1526	EPP uses a prefix of C<N> (4 octtes).
1106		1527
1107	Example: read a block of data prefixed by its length in BER-encoded	1528	Example: read a block of data prefixed by its length in BER-encoded
1108	format (very efficient).	1529	format (very efficient).
1109		1530
1110	$handle->push_read (packstring => "w", sub {	1531	$handle->push_read (packstring => "w", sub {
…		…
1140	}	1561	}
1141	};	1562	};
1142		1563
1143	=item json => $cb->($handle, $hash_or_arrayref)	1564	=item json => $cb->($handle, $hash_or_arrayref)
1144		1565
1145	Reads a JSON object or array, decodes it and passes it to the callback.	1566	Reads a JSON object or array, decodes it and passes it to the
		1567	callback. When a parse error occurs, an C<EBADMSG> error will be raised.
1146		1568
1147	If a C<json> object was passed to the constructor, then that will be used	1569	If a C<json> object was passed to the constructor, then that will be used
1148	for the final decode, otherwise it will create a JSON coder expecting UTF-8.	1570	for the final decode, otherwise it will create a JSON coder expecting UTF-8.
1149		1571
1150	This read type uses the incremental parser available with JSON version	1572	This read type uses the incremental parser available with JSON version
…		…
1159	=cut	1581	=cut
1160		1582
1161	register_read_type json => sub {	1583	register_read_type json => sub {
1162	my ($self, $cb) = @_;	1584	my ($self, $cb) = @_;
1163		1585
1164	require JSON;	1586	my $json = $self->{json} ||= json_coder;
1165		1587
1166	my $data;	1588	my $data;
1167	my $rbuf = \$self->{rbuf};	1589	my $rbuf = \$self->{rbuf};
1168		1590
1169	my $json = $self->{json} ||= JSON->new->utf8;
1170
1171	sub {	1591	sub {
1172	my $ref = $json->incr_parse ($self->{rbuf});	1592	my $ref = eval { $json->incr_parse ($self->{rbuf}) };
1173		1593
1174	if ($ref) {	1594	if ($ref) {
1175	$self->{rbuf} = $json->incr_text;	1595	$self->{rbuf} = $json->incr_text;
1176	$json->incr_text = "";	1596	$json->incr_text = "";
1177	$cb->($self, $ref);	1597	$cb->($self, $ref);
1178		1598
1179	1	1599	1
		1600	} elsif ($@) {
		1601	# error case
		1602	$json->incr_skip;
		1603
		1604	$self->{rbuf} = $json->incr_text;
		1605	$json->incr_text = "";
		1606
		1607	$self->_error (Errno::EBADMSG);
		1608
		1609	()
1180	} else {	1610	} else {
1181	$self->{rbuf} = "";	1611	$self->{rbuf} = "";
		1612
1182	()	1613	()
1183	}	1614	}
1184	}	1615	}
1185	};	1616	};
1186		1617
…		…
1218	# read remaining chunk	1649	# read remaining chunk
1219	$_[0]->unshift_read (chunk => $len, sub {	1650	$_[0]->unshift_read (chunk => $len, sub {
1220	if (my $ref = eval { Storable::thaw ($_[1]) }) {	1651	if (my $ref = eval { Storable::thaw ($_[1]) }) {
1221	$cb->($_[0], $ref);	1652	$cb->($_[0], $ref);
1222	} else {	1653	} else {
1223	$self->_error (&Errno::EBADMSG);	1654	$self->_error (Errno::EBADMSG);
1224	}	1655	}
1225	});	1656	});
1226	}	1657	}
1227		1658
1228	1	1659	1
1229	}	1660	}
1230	};	1661	};
1231		1662
1232	=back	1663	=back
1233		1664
1234	=item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args)	1665	=item custom read types - Package::anyevent_read_type $handle, $cb, @args
1235		1666
1236	This function (not method) lets you add your own types to C<push_read>.	1667	Instead of one of the predefined types, you can also specify the name
		1668	of a package. AnyEvent will try to load the package and then expects to
		1669	find a function named C<anyevent_read_type> inside. If it isn't found, it
		1670	progressively tries to load the parent package until it either finds the
		1671	function (good) or runs out of packages (bad).
1237		1672
1238	Whenever the given C<type> is used, C<push_read> will invoke the code	1673	Whenever this type is used, C<push_read> will invoke the function with the
1239	reference with the handle object, the callback and the remaining	1674	handle object, the original callback and the remaining arguments.
1240	arguments.
1241		1675
1242	The code reference is supposed to return a callback (usually a closure)	1676	The function is supposed to return a callback (usually a closure) that
1243	that works as a plain read callback (see C<< ->push_read ($cb) >>).	1677	works as a plain read callback (see C<< ->push_read ($cb) >>), so you can
		1678	mentally treat the function as a "configurable read type to read callback"
		1679	converter.
1244		1680
1245	It should invoke the passed callback when it is done reading (remember to	1681	It should invoke the original callback when it is done reading (remember
1246	pass C<$handle> as first argument as all other callbacks do that).	1682	to pass C<$handle> as first argument as all other callbacks do that,
		1683	although there is no strict requirement on this).
1247		1684
1248	Note that this is a function, and all types registered this way will be
1249	global, so try to use unique names.
1250
1251	For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>,	1685	For examples, see the source of this module (F<perldoc -m
1252	search for C<register_read_type>)).	1686	AnyEvent::Handle>, search for C<register_read_type>)).
1253		1687
1254	=item $handle->stop_read	1688	=item $handle->stop_read
1255		1689
1256	=item $handle->start_read	1690	=item $handle->start_read
1257		1691
…		…
1263	Note that AnyEvent::Handle will automatically C<start_read> for you when	1697	Note that AnyEvent::Handle will automatically C<start_read> for you when
1264	you change the C<on_read> callback or push/unshift a read callback, and it	1698	you change the C<on_read> callback or push/unshift a read callback, and it
1265	will automatically C<stop_read> for you when neither C<on_read> is set nor	1699	will automatically C<stop_read> for you when neither C<on_read> is set nor
1266	there are any read requests in the queue.	1700	there are any read requests in the queue.
1267		1701
		1702	These methods will have no effect when in TLS mode (as TLS doesn't support
		1703	half-duplex connections).
		1704
1268	=cut	1705	=cut
1269		1706
1270	sub stop_read {	1707	sub stop_read {
1271	my ($self) = @_;	1708	my ($self) = @_;
1272		1709
1273	delete $self->{_rw};	1710	delete $self->{_rw} unless $self->{tls};
1274	}	1711	}
1275		1712
1276	sub start_read {	1713	sub start_read {
1277	my ($self) = @_;	1714	my ($self) = @_;
1278		1715
1279	unless ($self->{_rw} || $self->{_eof}) {	1716	unless ($self->{_rw} || $self->{_eof}) {
1280	Scalar::Util::weaken $self;	1717	Scalar::Util::weaken $self;
1281		1718
1282	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1719	$self->{_rw} = AE::io $self->{fh}, 0, sub {
1283	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1720	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1284	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;	1721	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;
1285		1722
1286	if ($len > 0) {	1723	if ($len > 0) {
1287	$self->{_activity} = AnyEvent->now;	1724	$self->{_activity} = $self->{_ractivity} = AE::now;
1288		1725
1289	$self->{filter_r}	1726	if ($self->{tls}) {
1290	? $self->{filter_r}($self, $rbuf)	1727	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1291	: $self->{_in_drain} || $self->_drain_rbuf;	1728
		1729	&_dotls ($self);
		1730	} else {
		1731	$self->_drain_rbuf;
		1732	}
1292		1733
1293	} elsif (defined $len) {	1734	} elsif (defined $len) {
1294	delete $self->{_rw};	1735	delete $self->{_rw};
1295	$self->{_eof} = 1;	1736	$self->{_eof} = 1;
1296	$self->_drain_rbuf unless $self->{_in_drain};	1737	$self->_drain_rbuf;
1297		1738
1298	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	1739	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
1299	return $self->_error ($!, 1);	1740	return $self->_error ($!, 1);
1300	}	1741	}
1301	});	1742	};
1302	}	1743	}
1303	}	1744	}
1304		1745
		1746	our $ERROR_SYSCALL;
		1747	our $ERROR_WANT_READ;
		1748
		1749	sub _tls_error {
		1750	my ($self, $err) = @_;
		1751
		1752	return $self->_error ($!, 1)
		1753	if $err == Net::SSLeay::ERROR_SYSCALL ();
		1754
		1755	my $err =Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ());
		1756
		1757	# reduce error string to look less scary
		1758	$err =~ s/^error:[0-9a-fA-F]{8}:[^:]+:([^:]+):/\L$1: /;
		1759
		1760	if ($self->{_on_starttls}) {
		1761	(delete $self->{_on_starttls})->($self, undef, $err);
		1762	&_freetls;
		1763	} else {
		1764	&_freetls;
		1765	$self->_error (Errno::EPROTO, 1, $err);
		1766	}
		1767	}
		1768
		1769	# poll the write BIO and send the data if applicable
		1770	# also decode read data if possible
		1771	# this is basiclaly our TLS state machine
		1772	# more efficient implementations are possible with openssl,
		1773	# but not with the buggy and incomplete Net::SSLeay.
1305	sub _dotls {	1774	sub _dotls {
1306	my ($self) = @_;	1775	my ($self) = @_;
1307		1776
1308	my $buf;	1777	my $tmp;
1309		1778
1310	if (length $self->{_tls_wbuf}) {	1779	if (length $self->{_tls_wbuf}) {
1311	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1780	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1312	substr $self->{_tls_wbuf}, 0, $len, "";	1781	substr $self->{_tls_wbuf}, 0, $tmp, "";
1313	}	1782	}
1314	}
1315		1783
		1784	$tmp = Net::SSLeay::get_error ($self->{tls}, $tmp);
		1785	return $self->_tls_error ($tmp)
		1786	if $tmp != $ERROR_WANT_READ
		1787	&& ($tmp != $ERROR_SYSCALL || $!);
		1788	}
		1789
		1790	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
		1791	unless (length $tmp) {
		1792	$self->{_on_starttls}
		1793	and (delete $self->{_on_starttls})->($self, undef, "EOF during handshake"); # ???
		1794	&_freetls;
		1795
		1796	if ($self->{on_stoptls}) {
		1797	$self->{on_stoptls}($self);
		1798	return;
		1799	} else {
		1800	# let's treat SSL-eof as we treat normal EOF
		1801	delete $self->{_rw};
		1802	$self->{_eof} = 1;
		1803	}
		1804	}
		1805
		1806	$self->{_tls_rbuf} .= $tmp;
		1807	$self->_drain_rbuf;
		1808	$self->{tls} or return; # tls session might have gone away in callback
		1809	}
		1810
		1811	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
		1812	return $self->_tls_error ($tmp)
		1813	if $tmp != $ERROR_WANT_READ
		1814	&& ($tmp != $ERROR_SYSCALL || $!);
		1815
1316	if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {	1816	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1317	$self->{wbuf} .= $buf;	1817	$self->{wbuf} .= $tmp;
1318	$self->_drain_wbuf;	1818	$self->_drain_wbuf;
1319	}	1819	}
1320		1820
1321	while (defined ($buf = Net::SSLeay::read ($self->{tls}))) {	1821	$self->{_on_starttls}
1322	if (length $buf) {	1822	and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK ()
1323	$self->{rbuf} .= $buf;	1823	and (delete $self->{_on_starttls})->($self, 1, "TLS/SSL connection established");
1324	$self->_drain_rbuf unless $self->{_in_drain};
1325	} else {
1326	# let's treat SSL-eof as we treat normal EOF
1327	$self->{_eof} = 1;
1328	$self->_shutdown;
1329	return;
1330	}
1331	}
1332
1333	my $err = Net::SSLeay::get_error ($self->{tls}, -1);
1334
1335	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {
1336	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {
1337	return $self->_error ($!, 1);
1338	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {
1339	return $self->_error (&Errno::EIO, 1);
1340	}
1341
1342	# all others are fine for our purposes
1343	}
1344	}	1824	}
1345		1825
1346	=item $handle->starttls ($tls[, $tls_ctx])	1826	=item $handle->starttls ($tls[, $tls_ctx])
1347		1827
1348	Instead of starting TLS negotiation immediately when the AnyEvent::Handle	1828	Instead of starting TLS negotiation immediately when the AnyEvent::Handle
1349	object is created, you can also do that at a later time by calling	1829	object is created, you can also do that at a later time by calling
1350	C<starttls>.	1830	C<starttls>.
1351		1831
		1832	Starting TLS is currently an asynchronous operation - when you push some
		1833	write data and then call C<< ->starttls >> then TLS negotiation will start
		1834	immediately, after which the queued write data is then sent.
		1835
1352	The first argument is the same as the C<tls> constructor argument (either	1836	The first argument is the same as the C<tls> constructor argument (either
1353	C<"connect">, C<"accept"> or an existing Net::SSLeay object).	1837	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
1354		1838
1355	The second argument is the optional C<Net::SSLeay::CTX> object that is	1839	The second argument is the optional C<AnyEvent::TLS> object that is used
1356	used when AnyEvent::Handle has to create its own TLS connection object.	1840	when AnyEvent::Handle has to create its own TLS connection object, or
		1841	a hash reference with C<< key => value >> pairs that will be used to
		1842	construct a new context.
1357		1843
1358	The TLS connection object will end up in C<< $handle->{tls} >> after this	1844	The TLS connection object will end up in C<< $handle->{tls} >>, the TLS
1359	call and can be used or changed to your liking. Note that the handshake	1845	context in C<< $handle->{tls_ctx} >> after this call and can be used or
1360	might have already started when this function returns.	1846	changed to your liking. Note that the handshake might have already started
		1847	when this function returns.
1361		1848
		1849	Due to bugs in OpenSSL, it might or might not be possible to do multiple
		1850	handshakes on the same stream. Best do not attempt to use the stream after
		1851	stopping TLS.
		1852
1362	=cut	1853	=cut
		1854
		1855	our %TLS_CACHE; #TODO not yet documented, should we?
1363		1856
1364	sub starttls {	1857	sub starttls {
1365	my ($self, $ssl, $ctx) = @_;	1858	my ($self, $tls, $ctx) = @_;
1366		1859
1367	$self->stoptls;	1860	Carp::croak "It is an error to call starttls on an AnyEvent::Handle object while TLS is already active, caught"
		1861	if $self->{tls};
1368		1862
1369	if ($ssl eq "accept") {	1863	$self->{tls} = $tls;
1370	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());	1864	$self->{tls_ctx} = $ctx if @_ > 2;
1371	Net::SSLeay::set_accept_state ($ssl);	1865
1372	} elsif ($ssl eq "connect") {	1866	return unless $self->{fh};
1373	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());	1867
1374	Net::SSLeay::set_connect_state ($ssl);	1868	require Net::SSLeay;
		1869
		1870	$ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL ();
		1871	$ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ ();
		1872
		1873	$tls = delete $self->{tls};
		1874	$ctx = $self->{tls_ctx};
		1875
		1876	local $Carp::CarpLevel = 1; # skip ourselves when creating a new context or session
		1877
		1878	if ("HASH" eq ref $ctx) {
		1879	require AnyEvent::TLS;
		1880
		1881	if ($ctx->{cache}) {
		1882	my $key = $ctx+0;
		1883	$ctx = $TLS_CACHE{$key} ||= new AnyEvent::TLS %$ctx;
		1884	} else {
		1885	$ctx = new AnyEvent::TLS %$ctx;
		1886	}
		1887	}
1375	}	1888
1376		1889	$self->{tls_ctx} = $ctx || TLS_CTX ();
1377	$self->{tls} = $ssl;	1890	$self->{tls} = $tls = $self->{tls_ctx}->_get_session ($tls, $self, $self->{peername});
1378		1891
1379	# basically, this is deep magic (because SSL_read should have the same issues)	1892	# basically, this is deep magic (because SSL_read should have the same issues)
1380	# but the openssl maintainers basically said: "trust us, it just works".	1893	# but the openssl maintainers basically said: "trust us, it just works".
1381	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1894	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1382	# and mismaintained ssleay-module doesn't even offer them).	1895	# and mismaintained ssleay-module doesn't even offer them).
1383	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html	1896	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
1384	#	1897	#
1385	# in short: this is a mess.	1898	# in short: this is a mess.
1386	#	1899	#
1387	# note that we do not try to kepe the length constant between writes as we are required to do.	1900	# note that we do not try to keep the length constant between writes as we are required to do.
1388	# we assume that most (but not all) of this insanity only applies to non-blocking cases,	1901	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
1389	# and we drive openssl fully in blocking mode here.	1902	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
		1903	# have identity issues in that area.
1390	Net::SSLeay::CTX_set_mode ($self->{tls},	1904	# Net::SSLeay::CTX_set_mode ($ssl,
1391	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)	1905	# (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)
1392	| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));	1906	# | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));
		1907	Net::SSLeay::CTX_set_mode ($tls, 1|2);
1393		1908
1394	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1909	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1395	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1910	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1396		1911
		1912	Net::SSLeay::BIO_write ($self->{_rbio}, delete $self->{rbuf});
		1913
1397	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	1914	Net::SSLeay::set_bio ($tls, $self->{_rbio}, $self->{_wbio});
1398		1915
1399	$self->{filter_w} = sub {	1916	$self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) }
1400	$_[0]{_tls_wbuf} .= ${$_[1]};	1917	if $self->{on_starttls};
1401	&_dotls;	1918
1402	};	1919	&_dotls; # need to trigger the initial handshake
1403	$self->{filter_r} = sub {	1920	$self->start_read; # make sure we actually do read
1404	Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]});
1405	&_dotls;
1406	};
1407	}	1921	}
1408		1922
1409	=item $handle->stoptls	1923	=item $handle->stoptls
1410		1924
1411	Destroys the SSL connection, if any. Partial read or write data will be	1925	Shuts down the SSL connection - this makes a proper EOF handshake by
1412	lost.	1926	sending a close notify to the other side, but since OpenSSL doesn't
		1927	support non-blocking shut downs, it is not guarenteed that you can re-use
		1928	the stream afterwards.
1413		1929
1414	=cut	1930	=cut
1415		1931
1416	sub stoptls {	1932	sub stoptls {
1417	my ($self) = @_;	1933	my ($self) = @_;
1418		1934
1419	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};	1935	if ($self->{tls}) {
		1936	Net::SSLeay::shutdown ($self->{tls});
1420		1937
1421	delete $self->{_rbio};	1938	&_dotls;
1422	delete $self->{_wbio};	1939
1423	delete $self->{_tls_wbuf};	1940	# # we don't give a shit. no, we do, but we can't. no...#d#
1424	delete $self->{filter_r};	1941	# # we, we... have to use openssl :/#d#
1425	delete $self->{filter_w};	1942	# &_freetls;#d#
		1943	}
		1944	}
		1945
		1946	sub _freetls {
		1947	my ($self) = @_;
		1948
		1949	return unless $self->{tls};
		1950
		1951	$self->{tls_ctx}->_put_session (delete $self->{tls})
		1952	if $self->{tls} > 0;
		1953
		1954	delete @$self{qw(_rbio _wbio _tls_wbuf _on_starttls)};
1426	}	1955	}
1427		1956
1428	sub DESTROY {	1957	sub DESTROY {
1429	my $self = shift;	1958	my ($self) = @_;
1430		1959
1431	$self->stoptls;	1960	&_freetls;
1432		1961
1433	my $linger = exists $self->{linger} ? $self->{linger} : 3600;	1962	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
1434		1963
1435	if ($linger && length $self->{wbuf}) {	1964	if ($linger && length $self->{wbuf} && $self->{fh}) {
1436	my $fh = delete $self->{fh};	1965	my $fh = delete $self->{fh};
1437	my $wbuf = delete $self->{wbuf};	1966	my $wbuf = delete $self->{wbuf};
1438		1967
1439	my @linger;	1968	my @linger;
1440		1969
1441	push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub {	1970	push @linger, AE::io $fh, 1, sub {
1442	my $len = syswrite $fh, $wbuf, length $wbuf;	1971	my $len = syswrite $fh, $wbuf, length $wbuf;
1443		1972
1444	if ($len > 0) {	1973	if ($len > 0) {
1445	substr $wbuf, 0, $len, "";	1974	substr $wbuf, 0, $len, "";
1446	} else {	1975	} else {
1447	@linger = (); # end	1976	@linger = (); # end
1448	}	1977	}
1449	});	1978	};
1450	push @linger, AnyEvent->timer (after => $linger, cb => sub {	1979	push @linger, AE::timer $linger, 0, sub {
1451	@linger = ();	1980	@linger = ();
1452	});	1981	};
1453	}	1982	}
		1983	}
		1984
		1985	=item $handle->destroy
		1986
		1987	Shuts down the handle object as much as possible - this call ensures that
		1988	no further callbacks will be invoked and as many resources as possible
		1989	will be freed. Any method you will call on the handle object after
		1990	destroying it in this way will be silently ignored (and it will return the
		1991	empty list).
		1992
		1993	Normally, you can just "forget" any references to an AnyEvent::Handle
		1994	object and it will simply shut down. This works in fatal error and EOF
		1995	callbacks, as well as code outside. It does I<NOT> work in a read or write
		1996	callback, so when you want to destroy the AnyEvent::Handle object from
		1997	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
		1998	that case.
		1999
		2000	Destroying the handle object in this way has the advantage that callbacks
		2001	will be removed as well, so if those are the only reference holders (as
		2002	is common), then one doesn't need to do anything special to break any
		2003	reference cycles.
		2004
		2005	The handle might still linger in the background and write out remaining
		2006	data, as specified by the C<linger> option, however.
		2007
		2008	=cut
		2009
		2010	sub destroy {
		2011	my ($self) = @_;
		2012
		2013	$self->DESTROY;
		2014	%$self = ();
		2015	bless $self, "AnyEvent::Handle::destroyed";
		2016	}
		2017
		2018	sub AnyEvent::Handle::destroyed::AUTOLOAD {
		2019	#nop
1454	}	2020	}
1455		2021
1456	=item AnyEvent::Handle::TLS_CTX	2022	=item AnyEvent::Handle::TLS_CTX
1457		2023
1458	This function creates and returns the Net::SSLeay::CTX object used by	2024	This function creates and returns the AnyEvent::TLS object used by default
1459	default for TLS mode.	2025	for TLS mode.
1460		2026
1461	The context is created like this:	2027	The context is created by calling L<AnyEvent::TLS> without any arguments.
1462
1463	Net::SSLeay::load_error_strings;
1464	Net::SSLeay::SSLeay_add_ssl_algorithms;
1465	Net::SSLeay::randomize;
1466
1467	my $CTX = Net::SSLeay::CTX_new;
1468
1469	Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL
1470		2028
1471	=cut	2029	=cut
1472		2030
1473	our $TLS_CTX;	2031	our $TLS_CTX;
1474		2032
1475	sub TLS_CTX() {	2033	sub TLS_CTX() {
1476	$TLS_CTX || do {	2034	$TLS_CTX ||= do {
1477	require Net::SSLeay;	2035	require AnyEvent::TLS;
1478		2036
1479	Net::SSLeay::load_error_strings ();	2037	new AnyEvent::TLS
1480	Net::SSLeay::SSLeay_add_ssl_algorithms ();
1481	Net::SSLeay::randomize ();
1482
1483	$TLS_CTX = Net::SSLeay::CTX_new ();
1484
1485	Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ());
1486
1487	$TLS_CTX
1488	}	2038	}
1489	}	2039	}
1490		2040
1491	=back	2041	=back
		2042
		2043
		2044	=head1 NONFREQUENTLY ASKED QUESTIONS
		2045
		2046	=over 4
		2047
		2048	=item I C<undef> the AnyEvent::Handle reference inside my callback and
		2049	still get further invocations!
		2050
		2051	That's because AnyEvent::Handle keeps a reference to itself when handling
		2052	read or write callbacks.
		2053
		2054	It is only safe to "forget" the reference inside EOF or error callbacks,
		2055	from within all other callbacks, you need to explicitly call the C<<
		2056	->destroy >> method.
		2057
		2058	=item I get different callback invocations in TLS mode/Why can't I pause
		2059	reading?
		2060
		2061	Unlike, say, TCP, TLS connections do not consist of two independent
		2062	communication channels, one for each direction. Or put differently. The
		2063	read and write directions are not independent of each other: you cannot
		2064	write data unless you are also prepared to read, and vice versa.
		2065
		2066	This can mean than, in TLS mode, you might get C<on_error> or C<on_eof>
		2067	callback invocations when you are not expecting any read data - the reason
		2068	is that AnyEvent::Handle always reads in TLS mode.
		2069
		2070	During the connection, you have to make sure that you always have a
		2071	non-empty read-queue, or an C<on_read> watcher. At the end of the
		2072	connection (or when you no longer want to use it) you can call the
		2073	C<destroy> method.
		2074
		2075	=item How do I read data until the other side closes the connection?
		2076
		2077	If you just want to read your data into a perl scalar, the easiest way
		2078	to achieve this is by setting an C<on_read> callback that does nothing,
		2079	clearing the C<on_eof> callback and in the C<on_error> callback, the data
		2080	will be in C<$_[0]{rbuf}>:
		2081
		2082	$handle->on_read (sub { });
		2083	$handle->on_eof (undef);
		2084	$handle->on_error (sub {
		2085	my $data = delete $_[0]{rbuf};
		2086	});
		2087
		2088	The reason to use C<on_error> is that TCP connections, due to latencies
		2089	and packets loss, might get closed quite violently with an error, when in
		2090	fact, all data has been received.
		2091
		2092	It is usually better to use acknowledgements when transferring data,
		2093	to make sure the other side hasn't just died and you got the data
		2094	intact. This is also one reason why so many internet protocols have an
		2095	explicit QUIT command.
		2096
		2097	=item I don't want to destroy the handle too early - how do I wait until
		2098	all data has been written?
		2099
		2100	After writing your last bits of data, set the C<on_drain> callback
		2101	and destroy the handle in there - with the default setting of
		2102	C<low_water_mark> this will be called precisely when all data has been
		2103	written to the socket:
		2104
		2105	$handle->push_write (...);
		2106	$handle->on_drain (sub {
		2107	warn "all data submitted to the kernel\n";
		2108	undef $handle;
		2109	});
		2110
		2111	If you just want to queue some data and then signal EOF to the other side,
		2112	consider using C<< ->push_shutdown >> instead.
		2113
		2114	=item I want to contact a TLS/SSL server, I don't care about security.
		2115
		2116	If your TLS server is a pure TLS server (e.g. HTTPS) that only speaks TLS,
		2117	simply connect to it and then create the AnyEvent::Handle with the C<tls>
		2118	parameter:
		2119
		2120	tcp_connect $host, $port, sub {
		2121	my ($fh) = @_;
		2122
		2123	my $handle = new AnyEvent::Handle
		2124	fh => $fh,
		2125	tls => "connect",
		2126	on_error => sub { ... };
		2127
		2128	$handle->push_write (...);
		2129	};
		2130
		2131	=item I want to contact a TLS/SSL server, I do care about security.
		2132
		2133	Then you should additionally enable certificate verification, including
		2134	peername verification, if the protocol you use supports it (see
		2135	L<AnyEvent::TLS>, C<verify_peername>).
		2136
		2137	E.g. for HTTPS:
		2138
		2139	tcp_connect $host, $port, sub {
		2140	my ($fh) = @_;
		2141
		2142	my $handle = new AnyEvent::Handle
		2143	fh => $fh,
		2144	peername => $host,
		2145	tls => "connect",
		2146	tls_ctx => { verify => 1, verify_peername => "https" },
		2147	...
		2148
		2149	Note that you must specify the hostname you connected to (or whatever
		2150	"peername" the protocol needs) as the C<peername> argument, otherwise no
		2151	peername verification will be done.
		2152
		2153	The above will use the system-dependent default set of trusted CA
		2154	certificates. If you want to check against a specific CA, add the
		2155	C<ca_file> (or C<ca_cert>) arguments to C<tls_ctx>:
		2156
		2157	tls_ctx => {
		2158	verify => 1,
		2159	verify_peername => "https",
		2160	ca_file => "my-ca-cert.pem",
		2161	},
		2162
		2163	=item I want to create a TLS/SSL server, how do I do that?
		2164
		2165	Well, you first need to get a server certificate and key. You have
		2166	three options: a) ask a CA (buy one, use cacert.org etc.) b) create a
		2167	self-signed certificate (cheap. check the search engine of your choice,
		2168	there are many tutorials on the net) or c) make your own CA (tinyca2 is a
		2169	nice program for that purpose).
		2170
		2171	Then create a file with your private key (in PEM format, see
		2172	L<AnyEvent::TLS>), followed by the certificate (also in PEM format). The
		2173	file should then look like this:
		2174
		2175	-----BEGIN RSA PRIVATE KEY-----
		2176	...header data
		2177	... lots of base64'y-stuff
		2178	-----END RSA PRIVATE KEY-----
		2179
		2180	-----BEGIN CERTIFICATE-----
		2181	... lots of base64'y-stuff
		2182	-----END CERTIFICATE-----
		2183
		2184	The important bits are the "PRIVATE KEY" and "CERTIFICATE" parts. Then
		2185	specify this file as C<cert_file>:
		2186
		2187	tcp_server undef, $port, sub {
		2188	my ($fh) = @_;
		2189
		2190	my $handle = new AnyEvent::Handle
		2191	fh => $fh,
		2192	tls => "accept",
		2193	tls_ctx => { cert_file => "my-server-keycert.pem" },
		2194	...
		2195
		2196	When you have intermediate CA certificates that your clients might not
		2197	know about, just append them to the C<cert_file>.
		2198
		2199	=back
		2200
1492		2201
1493	=head1 SUBCLASSING AnyEvent::Handle	2202	=head1 SUBCLASSING AnyEvent::Handle
1494		2203
1495	In many cases, you might want to subclass AnyEvent::Handle.	2204	In many cases, you might want to subclass AnyEvent::Handle.
1496		2205

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