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Revision 1.188 by root, Thu Sep 17 08:20:14 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 = 4.331;
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	warn "got error $msg\n";
		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	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
		114	=item on_prepare => $cb->($handle)
		115
		116	This (rarely used) callback is called before a new connection is
		117	attempted, but after the file handle has been created. It could be used to
		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).
		121
		122	The return value of this callback should be the connect timeout value in
		123	seconds (or C<0>, or C<undef>, or the empty list, to indicate the default
		124	timeout is to be used).
		125
		126	=item on_connect => $cb->($handle, $host, $port, $retry->())
		127
		128	This callback is called when a connection has been successfully established.
		129
		130	The actual numeric host and port (the socket peername) are passed as
		131	parameters, together with a retry callback.
		132
		133	When, for some reason, the handle is not acceptable, then calling
		134	C<$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
		153	=item on_error => $cb->($handle, $fatal, $message)
		154
		155	This is the error callback, which is called when, well, some error
		156	occured, such as not being able to resolve the hostname, failure to
		157	connect or a read error.
		158
		159	Some errors are fatal (which is indicated by C<$fatal> being true). On
		160	fatal errors the handle object will be destroyed (by a call to C<< ->
		161	destroy >>) after invoking the error callback (which means you are free to
		162	examine the handle object). Examples of fatal errors are an EOF condition
		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<$message> argument in human-readable
		170	error messages (it's usually the same as C<"$!">).
		171
		172	Non-fatal errors can be retried by simply returning, but it is recommended
		173	to simply ignore this parameter and instead abondon the handle object
		174	when this callback is invoked. Examples of non-fatal errors are timeouts
		175	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
		176
		177	On callback entrance, the value of C<$!> contains the operating system
		178	error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or
		179	C<EPROTO>).
		180
		181	While not mandatory, it is I<highly> recommended to set this callback, as
		182	you will not be notified of errors otherwise. The default simply calls
		183	C<croak>.
		184
		185	=item on_read => $cb->($handle)
		186
		187	This sets the default read callback, which is called when data arrives
		188	and no read request is in the queue (unlike read queue callbacks, this
		189	callback will only be called when at least one octet of data is in the
		190	read buffer).
		191
		192	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
		193	method or access the C<< $handle->{rbuf} >> member directly. Note that you
		194	must not enlarge or modify the read buffer, you can only remove data at
		195	the beginning from it.
		196
		197	When an EOF condition is detected then AnyEvent::Handle will first try to
		198	feed all the remaining data to the queued callbacks and C<on_read> before
		199	calling the C<on_eof> callback. If no progress can be made, then a fatal
		200	error will be raised (with C<$!> 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
82	=item on_eof => $cb->($handle)	207	=item on_eof => $cb->($handle)
83		208
84	Set the callback to be called when an end-of-file condition is detected,	209	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	210	i.e. in the case of a socket, when the other side has closed the
86	connection cleanly.	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).
87		214
88	For sockets, this just means that the other side has stopped sending data,	215	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	216	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	217	callback and continue writing data, as only the read part has been shut
91	down.	218	down.
92		219
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	220	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<$!> set to <0>.	221	set, then a fatal error will be raised with C<$!> set to <0>.
99
100	=item on_error => $cb->($handle, $fatal)
101
102	This is the error callback, which is called when, well, some error
103	occured, such as not being able to resolve the hostname, failure to
104	connect or a read error.
105
106	Some errors are fatal (which is indicated by C<$fatal> being true). On
107	fatal errors the handle object will be shut down and will not be usable
108	(but you are free to look at the current C<< ->rbuf >>). Examples of fatal
109	errors are an EOF condition with active (but unsatisifable) read watchers
110	(C<EPIPE>) or I/O errors.
111
112	Non-fatal errors can be retried by simply returning, but it is recommended
113	to simply ignore this parameter and instead abondon the handle object
114	when this callback is invoked. Examples of non-fatal errors are timeouts
115	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
116
117	On callback entrance, the value of C<$!> contains the operating system
118	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).
119
120	While not mandatory, it is I<highly> recommended to set this callback, as
121	you will not be notified of errors otherwise. The default simply calls
122	C<croak>.
123
124	=item on_read => $cb->($handle)
125
126	This sets the default read callback, which is called when data arrives
127	and no read request is in the queue (unlike read queue callbacks, this
128	callback will only be called when at least one octet of data is in the
129	read buffer).
130
131	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
132	method or access the C<$handle->{rbuf}> member directly.
133
134	When an EOF condition is detected then AnyEvent::Handle will first try to
135	feed all the remaining data to the queued callbacks and C<on_read> before
136	calling the C<on_eof> callback. If no progress can be made, then a fatal
137	error will be raised (with C<$!> set to C<EPIPE>).
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>.
…		…
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. Calling the C<stoptls> method in time might	364	yet. This data will be lost. Calling the C<stoptls> method in time might
238	help.	365	help.
239		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>.
		376
240	=item tls => "accept" | "connect" | Net::SSLeay::SSL object	377	=item tls => "accept" | "connect" | Net::SSLeay::SSL object
241		378
242	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
243	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
244	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.
245		385
246	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
247	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
248	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
249	to add the dependency yourself.	389	to add the dependency yourself.
…		…
253	mode.	393	mode.
254		394
255	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
256	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>
257	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
258	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.
259		404
260	B<IMPORTANT:> since Net::SSLeay "objects" are really only integers,	405	B<IMPORTANT:> since Net::SSLeay "objects" are really only integers,
261	passing in the wrong integer will lead to certain crash. This most often	406	passing in the wrong integer will lead to certain crash. This most often
262	happens when one uses a stylish C<< tls => 1 >> and is surprised about the	407	happens when one uses a stylish C<< tls => 1 >> and is surprised about the
263	segmentation fault.	408	segmentation fault.
264		409
265	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.
266		411
267	=item tls_ctx => $ssl_ctx	412	=item tls_ctx => $anyevent_tls
268		413
269	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
270	(unless a connection object was specified directly). If this parameter is	415	(unless a connection object was specified directly). If this parameter is
271	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.
272		453
273	=item json => JSON or JSON::XS object	454	=item json => JSON or JSON::XS object
274		455
275	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.
276		457
…		…
285		466
286	=cut	467	=cut
287		468
288	sub new {	469	sub new {
289	my $class = shift;	470	my $class = shift;
290
291	my $self = bless { @_ }, $class;	471	my $self = bless { @_ }, $class;
292		472
293	$self->{fh} or Carp::croak "mandatory argument fh is missing";	473	if ($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) = @_;
294		536
295	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	537	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
296		538
		539	$self->{_activity} =
		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
297	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})	552	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})
298	if $self->{tls};	553	if $self->{tls};
299		554
300	$self->{_activity} = AnyEvent->now;
301	$self->_timeout;
302
303	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};	555	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};
304	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};
305		556
306	$self->start_read	557	$self->start_read
307	if $self->{on_read};	558	if $self->{on_read} || @{ $self->{_queue} };
308		559
309	$self	560	$self->_drain_wbuf;
310	}
311
312	sub _shutdown {
313	my ($self) = @_;
314
315	delete $self->{_tw};
316	delete $self->{_rw};
317	delete $self->{_ww};
318	delete $self->{fh};
319
320	&_freetls;
321
322	delete $self->{on_read};
323	delete $self->{_queue};
324	}	561	}
325		562
326	sub _error {	563	sub _error {
327	my ($self, $errno, $fatal) = @_;	564	my ($self, $errno, $fatal, $message) = @_;
328
329	$self->_shutdown
330	if $fatal;
331		565
332	$! = $errno;	566	$! = $errno;
		567	$message ||= "$!";
333		568
334	if ($self->{on_error}) {	569	if ($self->{on_error}) {
335	$self->{on_error}($self, $fatal);	570	$self->{on_error}($self, $fatal, $message);
336	} elsif ($self->{fh}) {	571	$self->destroy if $fatal;
		572	} elsif ($self->{fh} || $self->{connect}) {
		573	$self->destroy;
337	Carp::croak "AnyEvent::Handle uncaught error: $!";	574	Carp::croak "AnyEvent::Handle uncaught error: $message";
338	}	575	}
339	}	576	}
340		577
341	=item $fh = $handle->fh	578	=item $fh = $handle->fh
342		579
…		…
366	$_[0]{on_eof} = $_[1];	603	$_[0]{on_eof} = $_[1];
367	}	604	}
368		605
369	=item $handle->on_timeout ($cb)	606	=item $handle->on_timeout ($cb)
370		607
371	Replace the current C<on_timeout> callback, or disables the callback (but	608	=item $handle->on_rtimeout ($cb)
372	not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor
373	argument and method.
374		609
375	=cut	610	=item $handle->on_wtimeout ($cb)
376		611
377	sub on_timeout {	612	Replace the current C<on_timeout>, C<on_rtimeout> or C<on_wtimeout>
378	$_[0]{on_timeout} = $_[1];	613	callback, or disables the callback (but not the timeout) if C<$cb> =
379	}	614	C<undef>. See the C<timeout> constructor argument and method.
		615
		616	=cut
		617
		618	# see below
380		619
381	=item $handle->autocork ($boolean)	620	=item $handle->autocork ($boolean)
382		621
383	Enables or disables the current autocork behaviour (see C<autocork>	622	Enables or disables the current autocork behaviour (see C<autocork>
384	constructor argument). Changes will only take effect on the next write.	623	constructor argument). Changes will only take effect on the next write.
…		…
399	sub no_delay {	638	sub no_delay {
400	$_[0]{no_delay} = $_[1];	639	$_[0]{no_delay} = $_[1];
401		640
402	eval {	641	eval {
403	local $SIG{__DIE__};	642	local $SIG{__DIE__};
404	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};
405	};	645	};
406	}	646	}
407		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
408	#############################################################################	729	#############################################################################
409		730
410	=item $handle->timeout ($seconds)	731	=item $handle->timeout ($seconds)
411		732
		733	=item $handle->rtimeout ($seconds)
		734
		735	=item $handle->wtimeout ($seconds)
		736
412	Configures (or disables) the inactivity timeout.	737	Configures (or disables) the inactivity timeout.
413		738
414	=cut	739	=item $handle->timeout_reset
415		740
416	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 {
417	my ($self, $timeout) = @_;	763	my ($self, $new_value) = @_;
418		764
419	$self->{timeout} = $timeout;	765	$self->{$timeout} = $new_value;
420	$self->_timeout;	766	delete $self->{$tw}; &$cb;
421	}	767	};
422		768
		769	*{"${dir}timeout_reset"} = sub {
		770	$_[0]{$activity} = AE::now;
		771	};
		772
		773	# main workhorse:
423	# reset the timeout watcher, as neccessary	774	# reset the timeout watcher, as neccessary
424	# also check for time-outs	775	# also check for time-outs
425	sub _timeout {	776	$cb = sub {
426	my ($self) = @_;	777	my ($self) = @_;
427		778
428	if ($self->{timeout}) {	779	if ($self->{$timeout} && $self->{fh}) {
429	my $NOW = AnyEvent->now;	780	my $NOW = AE::now;
430		781
431	# when would the timeout trigger?	782	# when would the timeout trigger?
432	my $after = $self->{_activity} + $self->{timeout} - $NOW;	783	my $after = $self->{$activity} + $self->{$timeout} - $NOW;
433		784
434	# now or in the past already?	785	# now or in the past already?
435	if ($after <= 0) {	786	if ($after <= 0) {
436	$self->{_activity} = $NOW;	787	$self->{$activity} = $NOW;
437		788
438	if ($self->{on_timeout}) {	789	if ($self->{$on_timeout}) {
439	$self->{on_timeout}($self);	790	$self->{$on_timeout}($self);
440	} else {	791	} else {
441	$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};
442	}	800	}
443		801
444	# callback could have changed timeout value, optimise	802	Scalar::Util::weaken $self;
445	return unless $self->{timeout};	803	return unless $self; # ->error could have destroyed $self
446		804
447	# calculate new after	805	$self->{$tw} ||= AE::timer $after, 0, sub {
448	$after = $self->{timeout};	806	delete $self->{$tw};
		807	$cb->($self);
		808	};
		809	} else {
		810	delete $self->{$tw};
449	}	811	}
450
451	Scalar::Util::weaken $self;
452	return unless $self; # ->error could have destroyed $self
453
454	$self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub {
455	delete $self->{_tw};
456	$self->_timeout;
457	});
458	} else {
459	delete $self->{_tw};
460	}	812	}
461	}	813	}
462		814
463	#############################################################################	815	#############################################################################
464		816
…		…
509	Scalar::Util::weaken $self;	861	Scalar::Util::weaken $self;
510		862
511	my $cb = sub {	863	my $cb = sub {
512	my $len = syswrite $self->{fh}, $self->{wbuf};	864	my $len = syswrite $self->{fh}, $self->{wbuf};
513		865
514	if ($len >= 0) {	866	if (defined $len) {
515	substr $self->{wbuf}, 0, $len, "";	867	substr $self->{wbuf}, 0, $len, "";
516		868
517	$self->{_activity} = AnyEvent->now;	869	$self->{_activity} = $self->{_wactivity} = AE::now;
518		870
519	$self->{on_drain}($self)	871	$self->{on_drain}($self)
520	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})	872	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
521	&& $self->{on_drain};	873	&& $self->{on_drain};
522		874
…		…
528		880
529	# try to write data immediately	881	# try to write data immediately
530	$cb->() unless $self->{autocork};	882	$cb->() unless $self->{autocork};
531		883
532	# if still data left in wbuf, we need to poll	884	# if still data left in wbuf, we need to poll
533	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)	885	$self->{_ww} = AE::io $self->{fh}, 1, $cb
534	if length $self->{wbuf};	886	if length $self->{wbuf};
535	};	887	};
536	}	888	}
537		889
538	our %WH;	890	our %WH;
539		891
		892	# deprecated
540	sub register_write_type($$) {	893	sub register_write_type($$) {
541	$WH{$_[0]} = $_[1];	894	$WH{$_[0]} = $_[1];
542	}	895	}
543		896
544	sub push_write {	897	sub push_write {
545	my $self = shift;	898	my $self = shift;
546		899
547	if (@_ > 1) {	900	if (@_ > 1) {
548	my $type = shift;	901	my $type = shift;
549		902
		903	@_ = ($WH{$type} ||= _load_func "$type\::anyevent_write_type"
550	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")	904	or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::push_write")
551	->($self, @_);	905	->($self, @_);
552	}	906	}
553		907
554	if ($self->{tls}) {	908	if ($self->{tls}) {
555	$self->{_tls_wbuf} .= $_[0];	909	$self->{_tls_wbuf} .= $_[0];
556		910	&_dotls ($self) if $self->{fh};
557	&_dotls ($self);
558	} else {	911	} else {
559	$self->{wbuf} .= $_[0];	912	$self->{wbuf} .= $_[0];
560	$self->_drain_wbuf;	913	$self->_drain_wbuf if $self->{fh};
561	}	914	}
562	}	915	}
563		916
564	=item $handle->push_write (type => @args)	917	=item $handle->push_write (type => @args)
565		918
566	Instead of formatting your data yourself, you can also let this module do	919	Instead of formatting your data yourself, you can also let this module
567	the job by specifying a type and type-specific arguments.	920	do the job by specifying a type and type-specific arguments. You
		921	can also specify the (fully qualified) name of a package, in which
		922	case AnyEvent tries to load the package and then expects to find the
		923	C<anyevent_read_type> function inside (see "custom write types", below).
568		924
569	Predefined types are (if you have ideas for additional types, feel free to	925	Predefined types are (if you have ideas for additional types, feel free to
570	drop by and tell us):	926	drop by and tell us):
571		927
572	=over 4	928	=over 4
…		…
629	Other languages could read single lines terminated by a newline and pass	985	Other languages could read single lines terminated by a newline and pass
630	this line into their JSON decoder of choice.	986	this line into their JSON decoder of choice.
631		987
632	=cut	988	=cut
633		989
		990	sub json_coder() {
		991	eval { require JSON::XS; JSON::XS->new->utf8 }
		992	|| do { require JSON; JSON->new->utf8 }
		993	}
		994
634	register_write_type json => sub {	995	register_write_type json => sub {
635	my ($self, $ref) = @_;	996	my ($self, $ref) = @_;
636		997
637	require JSON;	998	my $json = $self->{json} ||= json_coder;
638		999
639	$self->{json} ? $self->{json}->encode ($ref)	1000	$json->encode ($ref)
640	: JSON::encode_json ($ref)
641	};	1001	};
642		1002
643	=item storable => $reference	1003	=item storable => $reference
644		1004
645	Freezes the given reference using L<Storable> and writes it to the	1005	Freezes the given reference using L<Storable> and writes it to the
…		…
655	pack "w/a*", Storable::nfreeze ($ref)	1015	pack "w/a*", Storable::nfreeze ($ref)
656	};	1016	};
657		1017
658	=back	1018	=back
659		1019
660	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)	1020	=item $handle->push_shutdown
661		1021
662	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
663	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
664	reference with the handle object and the remaining arguments.	1054	the handle object and the remaining arguments.
665		1055
666	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
667	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.
668		1059
669	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
670	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 $delim, @args
		1075	}
671		1076
672	=cut	1077	=cut
673		1078
674	#############################################################################	1079	#############################################################################
675		1080
…		…
757	=cut	1162	=cut
758		1163
759	sub _drain_rbuf {	1164	sub _drain_rbuf {
760	my ($self) = @_;	1165	my ($self) = @_;
761		1166
		1167	# avoid recursion
		1168	return if $self->{_skip_drain_rbuf};
762	local $self->{_in_drain} = 1;	1169	local $self->{_skip_drain_rbuf} = 1;
763
764	if (
765	defined $self->{rbuf_max}
766	&& $self->{rbuf_max} < length $self->{rbuf}
767	) {
768	$self->_error (&Errno::ENOSPC, 1), return;
769	}
770		1170
771	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
772	my $len = length $self->{rbuf};	1177	my $len = length $self->{rbuf};
773		1178
774	if (my $cb = shift @{ $self->{_queue} }) {	1179	if (my $cb = shift @{ $self->{_queue} }) {
775	unless ($cb->($self)) {	1180	unless ($cb->($self)) {
776	if ($self->{_eof}) {	1181	# no progress can be made
777	# no progress can be made (not enough data and no data forthcoming)	1182	# (not enough data and no data forthcoming)
778	$self->_error (&Errno::EPIPE, 1), return;	1183	$self->_error (Errno::EPIPE, 1), return
779	}	1184	if $self->{_eof};
780		1185
781	unshift @{ $self->{_queue} }, $cb;	1186	unshift @{ $self->{_queue} }, $cb;
782	last;	1187	last;
783	}	1188	}
784	} elsif ($self->{on_read}) {	1189	} elsif ($self->{on_read}) {
…		…
791	&& !@{ $self->{_queue} } # and the queue is still empty	1196	&& !@{ $self->{_queue} } # and the queue is still empty
792	&& $self->{on_read} # but we still have on_read	1197	&& $self->{on_read} # but we still have on_read
793	) {	1198	) {
794	# no further data will arrive	1199	# no further data will arrive
795	# so no progress can be made	1200	# so no progress can be made
796	$self->_error (&Errno::EPIPE, 1), return	1201	$self->_error (Errno::EPIPE, 1), return
797	if $self->{_eof};	1202	if $self->{_eof};
798		1203
799	last; # more data might arrive	1204	last; # more data might arrive
800	}	1205	}
801	} else {	1206	} else {
…		…
804	last;	1209	last;
805	}	1210	}
806	}	1211	}
807		1212
808	if ($self->{_eof}) {	1213	if ($self->{_eof}) {
809	if ($self->{on_eof}) {	1214	$self->{on_eof}
810	$self->{on_eof}($self)	1215	? $self->{on_eof}($self)
811	} else {	1216	: $self->_error (0, 1, "Unexpected end-of-file");
812	$self->_error (0, 1);	1217
813	}	1218	return;
		1219	}
		1220
		1221	if (
		1222	defined $self->{rbuf_max}
		1223	&& $self->{rbuf_max} < length $self->{rbuf}
		1224	) {
		1225	$self->_error (Errno::ENOSPC, 1), return;
814	}	1226	}
815		1227
816	# may need to restart read watcher	1228	# may need to restart read watcher
817	unless ($self->{_rw}) {	1229	unless ($self->{_rw}) {
818	$self->start_read	1230	$self->start_read
…		…
830		1242
831	sub on_read {	1243	sub on_read {
832	my ($self, $cb) = @_;	1244	my ($self, $cb) = @_;
833		1245
834	$self->{on_read} = $cb;	1246	$self->{on_read} = $cb;
835	$self->_drain_rbuf if $cb && !$self->{_in_drain};	1247	$self->_drain_rbuf if $cb;
836	}	1248	}
837		1249
838	=item $handle->rbuf	1250	=item $handle->rbuf
839		1251
840	Returns the read buffer (as a modifiable lvalue).	1252	Returns the read buffer (as a modifiable lvalue).
841		1253
842	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} >>
843	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.
844		1259
845	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>,
846	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
847	automatically manage the read buffer.	1262	automatically manage the read buffer.
848		1263
…		…
884	my $cb = pop;	1299	my $cb = pop;
885		1300
886	if (@_) {	1301	if (@_) {
887	my $type = shift;	1302	my $type = shift;
888		1303
		1304	$cb = ($RH{$type} ||= _load_func "$type\::anyevent_read_type"
889	$cb = ($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")
890	->($self, $cb, @_);	1306	->($self, $cb, @_);
891	}	1307	}
892		1308
893	push @{ $self->{_queue} }, $cb;	1309	push @{ $self->{_queue} }, $cb;
894	$self->_drain_rbuf unless $self->{_in_drain};	1310	$self->_drain_rbuf;
895	}	1311	}
896		1312
897	sub unshift_read {	1313	sub unshift_read {
898	my $self = shift;	1314	my $self = shift;
899	my $cb = pop;	1315	my $cb = pop;
…		…
903		1319
904	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read")	1320	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read")
905	->($self, $cb, @_);	1321	->($self, $cb, @_);
906	}	1322	}
907		1323
908
909	unshift @{ $self->{_queue} }, $cb;	1324	unshift @{ $self->{_queue} }, $cb;
910	$self->_drain_rbuf unless $self->{_in_drain};	1325	$self->_drain_rbuf;
911	}	1326	}
912		1327
913	=item $handle->push_read (type => @args, $cb)	1328	=item $handle->push_read (type => @args, $cb)
914		1329
915	=item $handle->unshift_read (type => @args, $cb)	1330	=item $handle->unshift_read (type => @args, $cb)
916		1331
917	Instead of providing a callback that parses the data itself you can chose	1332	Instead of providing a callback that parses the data itself you can chose
918	between a number of predefined parsing formats, for chunks of data, lines	1333	between a number of predefined parsing formats, for chunks of data, lines
919	etc.	1334	etc. You can also specify the (fully qualified) name of a package, in
		1335	which case AnyEvent tries to load the package and then expects to find the
		1336	C<anyevent_read_type> function inside (see "custom read types", below).
920		1337
921	Predefined types are (if you have ideas for additional types, feel free to	1338	Predefined types are (if you have ideas for additional types, feel free to
922	drop by and tell us):	1339	drop by and tell us):
923		1340
924	=over 4	1341	=over 4
…		…
1048	return 1;	1465	return 1;
1049	}	1466	}
1050		1467
1051	# reject	1468	# reject
1052	if ($reject && $$rbuf =~ $reject) {	1469	if ($reject && $$rbuf =~ $reject) {
1053	$self->_error (&Errno::EBADMSG);	1470	$self->_error (Errno::EBADMSG);
1054	}	1471	}
1055		1472
1056	# skip	1473	# skip
1057	if ($skip && $$rbuf =~ $skip) {	1474	if ($skip && $$rbuf =~ $skip) {
1058	$data .= substr $$rbuf, 0, $+[0], "";	1475	$data .= substr $$rbuf, 0, $+[0], "";
…		…
1074	my ($self, $cb) = @_;	1491	my ($self, $cb) = @_;
1075		1492
1076	sub {	1493	sub {
1077	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {	1494	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {
1078	if ($_[0]{rbuf} =~ /[^0-9]/) {	1495	if ($_[0]{rbuf} =~ /[^0-9]/) {
1079	$self->_error (&Errno::EBADMSG);	1496	$self->_error (Errno::EBADMSG);
1080	}	1497	}
1081	return;	1498	return;
1082	}	1499	}
1083		1500
1084	my $len = $1;	1501	my $len = $1;
…		…
1087	my $string = $_[1];	1504	my $string = $_[1];
1088	$_[0]->unshift_read (chunk => 1, sub {	1505	$_[0]->unshift_read (chunk => 1, sub {
1089	if ($_[1] eq ",") {	1506	if ($_[1] eq ",") {
1090	$cb->($_[0], $string);	1507	$cb->($_[0], $string);
1091	} else {	1508	} else {
1092	$self->_error (&Errno::EBADMSG);	1509	$self->_error (Errno::EBADMSG);
1093	}	1510	}
1094	});	1511	});
1095	});	1512	});
1096		1513
1097	1	1514	1
…		…
1164	=cut	1581	=cut
1165		1582
1166	register_read_type json => sub {	1583	register_read_type json => sub {
1167	my ($self, $cb) = @_;	1584	my ($self, $cb) = @_;
1168		1585
1169	require JSON;	1586	my $json = $self->{json} ||= json_coder;
1170		1587
1171	my $data;	1588	my $data;
1172	my $rbuf = \$self->{rbuf};	1589	my $rbuf = \$self->{rbuf};
1173
1174	my $json = $self->{json} ||= JSON->new->utf8;
1175		1590
1176	sub {	1591	sub {
1177	my $ref = eval { $json->incr_parse ($self->{rbuf}) };	1592	my $ref = eval { $json->incr_parse ($self->{rbuf}) };
1178		1593
1179	if ($ref) {	1594	if ($ref) {
…		…
1187	$json->incr_skip;	1602	$json->incr_skip;
1188		1603
1189	$self->{rbuf} = $json->incr_text;	1604	$self->{rbuf} = $json->incr_text;
1190	$json->incr_text = "";	1605	$json->incr_text = "";
1191		1606
1192	$self->_error (&Errno::EBADMSG);	1607	$self->_error (Errno::EBADMSG);
		1608
1193	()	1609	()
1194
1195	} else {	1610	} else {
1196	$self->{rbuf} = "";	1611	$self->{rbuf} = "";
		1612
1197	()	1613	()
1198	}	1614	}
1199	}	1615	}
1200	};	1616	};
1201		1617
…		…
1233	# read remaining chunk	1649	# read remaining chunk
1234	$_[0]->unshift_read (chunk => $len, sub {	1650	$_[0]->unshift_read (chunk => $len, sub {
1235	if (my $ref = eval { Storable::thaw ($_[1]) }) {	1651	if (my $ref = eval { Storable::thaw ($_[1]) }) {
1236	$cb->($_[0], $ref);	1652	$cb->($_[0], $ref);
1237	} else {	1653	} else {
1238	$self->_error (&Errno::EBADMSG);	1654	$self->_error (Errno::EBADMSG);
1239	}	1655	}
1240	});	1656	});
1241	}	1657	}
1242		1658
1243	1	1659	1
1244	}	1660	}
1245	};	1661	};
1246		1662
1247	=back	1663	=back
1248		1664
1249	=item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args)	1665	=item custom read types - Package::anyevent_read_type $handle, $cb, @args
1250		1666
1251	This function (not method) lets you add your own types to C<push_read>.	1667	Instead of one of the predefined types, you can also specify the name
		1668	of a package. AnyEvent will try to load the package and then expects to
		1669	find a function named C<anyevent_read_type> inside. If it isn't found, it
		1670	progressively tries to load the parent package until it either finds the
		1671	function (good) or runs out of packages (bad).
1252		1672
1253	Whenever the given C<type> is used, C<push_read> will invoke the code	1673	Whenever this type is used, C<push_read> will invoke the function with the
1254	reference with the handle object, the callback and the remaining	1674	handle object, the original callback and the remaining arguments.
1255	arguments.
1256		1675
1257	The code reference is supposed to return a callback (usually a closure)	1676	The function is supposed to return a callback (usually a closure) that
1258	that works as a plain read callback (see C<< ->push_read ($cb) >>).	1677	works as a plain read callback (see C<< ->push_read ($cb) >>), so you can
		1678	mentally treat the function as a "configurable read type to read callback"
		1679	converter.
1259		1680
1260	It should invoke the passed callback when it is done reading (remember to	1681	It should invoke the original callback when it is done reading (remember
1261	pass C<$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).
1262		1684
1263	Note that this is a function, and all types registered this way will be
1264	global, so try to use unique names.
1265
1266	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
1267	search for C<register_read_type>)).	1686	AnyEvent::Handle>, search for C<register_read_type>)).
1268		1687
1269	=item $handle->stop_read	1688	=item $handle->stop_read
1270		1689
1271	=item $handle->start_read	1690	=item $handle->start_read
1272		1691
…		…
1295	my ($self) = @_;	1714	my ($self) = @_;
1296		1715
1297	unless ($self->{_rw} || $self->{_eof}) {	1716	unless ($self->{_rw} || $self->{_eof}) {
1298	Scalar::Util::weaken $self;	1717	Scalar::Util::weaken $self;
1299		1718
1300	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1719	$self->{_rw} = AE::io $self->{fh}, 0, sub {
1301	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});	1720	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1302	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;
1303		1722
1304	if ($len > 0) {	1723	if ($len > 0) {
1305	$self->{_activity} = AnyEvent->now;	1724	$self->{_activity} = $self->{_ractivity} = AE::now;
1306		1725
1307	if ($self->{tls}) {	1726	if ($self->{tls}) {
1308	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);	1727	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1309		1728
1310	&_dotls ($self);	1729	&_dotls ($self);
1311	} else {	1730	} else {
1312	$self->_drain_rbuf unless $self->{_in_drain};	1731	$self->_drain_rbuf;
1313	}	1732	}
1314		1733
1315	} elsif (defined $len) {	1734	} elsif (defined $len) {
1316	delete $self->{_rw};	1735	delete $self->{_rw};
1317	$self->{_eof} = 1;	1736	$self->{_eof} = 1;
1318	$self->_drain_rbuf unless $self->{_in_drain};	1737	$self->_drain_rbuf;
1319		1738
1320	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	1739	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
1321	return $self->_error ($!, 1);	1740	return $self->_error ($!, 1);
1322	}	1741	}
1323	});	1742	};
		1743	}
		1744	}
		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, $err);
1324	}	1766	}
1325	}	1767	}
1326		1768
1327	# poll the write BIO and send the data if applicable	1769	# poll the write BIO and send the data if applicable
		1770	# also decode read data if possible
		1771	# this is basiclaly our TLS state machine
		1772	# more efficient implementations are possible with openssl,
		1773	# but not with the buggy and incomplete Net::SSLeay.
1328	sub _dotls {	1774	sub _dotls {
1329	my ($self) = @_;	1775	my ($self) = @_;
1330		1776
1331	my $tmp;	1777	my $tmp;
1332		1778
1333	if (length $self->{_tls_wbuf}) {	1779	if (length $self->{_tls_wbuf}) {
1334	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1780	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1335	substr $self->{_tls_wbuf}, 0, $tmp, "";	1781	substr $self->{_tls_wbuf}, 0, $tmp, "";
1336	}	1782	}
		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 || $!);
1337	}	1788	}
1338		1789
1339	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {	1790	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
1340	unless (length $tmp) {	1791	unless (length $tmp) {
1341	# let's treat SSL-eof as we treat normal EOF	1792	$self->{_on_starttls}
1342	delete $self->{_rw};	1793	and (delete $self->{_on_starttls})->($self, undef, "EOF during handshake"); # ???
1343	$self->{_eof} = 1;
1344	&_freetls;	1794	&_freetls;
		1795
		1796	if ($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	}
1345	}	1804	}
1346		1805
1347	$self->{rbuf} .= $tmp;	1806	$self->{_tls_rbuf} .= $tmp;
1348	$self->_drain_rbuf unless $self->{_in_drain};	1807	$self->_drain_rbuf;
1349	$self->{tls} or return; # tls session might have gone away in callback	1808	$self->{tls} or return; # tls session might have gone away in callback
1350	}	1809	}
1351		1810
1352	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);	1811	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
1353
1354	if ($tmp != Net::SSLeay::ERROR_WANT_READ ()) {
1355	if ($tmp == Net::SSLeay::ERROR_SYSCALL ()) {
1356	return $self->_error ($!, 1);	1812	return $self->_tls_error ($tmp)
1357	} elsif ($tmp == Net::SSLeay::ERROR_SSL ()) {	1813	if $tmp != $ERROR_WANT_READ
1358	return $self->_error (&Errno::EIO, 1);	1814	&& ($tmp != $ERROR_SYSCALL || $!);
1359	}
1360
1361	# all other errors are fine for our purposes
1362	}
1363		1815
1364	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {	1816	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1365	$self->{wbuf} .= $tmp;	1817	$self->{wbuf} .= $tmp;
1366	$self->_drain_wbuf;	1818	$self->_drain_wbuf;
1367	}	1819	}
		1820
		1821	$self->{_on_starttls}
		1822	and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK ()
		1823	and (delete $self->{_on_starttls})->($self, 1, "TLS/SSL connection established");
1368	}	1824	}
1369		1825
1370	=item $handle->starttls ($tls[, $tls_ctx])	1826	=item $handle->starttls ($tls[, $tls_ctx])
1371		1827
1372	Instead of starting TLS negotiation immediately when the AnyEvent::Handle	1828	Instead of starting TLS negotiation immediately when the AnyEvent::Handle
1373	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
1374	C<starttls>.	1830	C<starttls>.
1375		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
1376	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
1377	C<"connect">, C<"accept"> or an existing Net::SSLeay object).	1837	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
1378		1838
1379	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
1380	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.
1381		1843
1382	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
1383	call and can be used or changed to your liking. Note that the handshake	1845	context in C<< $handle->{tls_ctx} >> after this call and can be used or
1384	might have already started when this function returns.	1846	changed to your liking. Note that the handshake might have already started
		1847	when this function returns.
1385		1848
1386	If it an error to start a TLS handshake more than once per	1849	Due to bugs in OpenSSL, it might or might not be possible to do multiple
1387	AnyEvent::Handle object (this is due to bugs in OpenSSL).	1850	handshakes on the same stream. Best do not attempt to use the stream after
		1851	stopping TLS.
1388		1852
1389	=cut	1853	=cut
		1854
		1855	our %TLS_CACHE; #TODO not yet documented, should we?
1390		1856
1391	sub starttls {	1857	sub starttls {
1392	my ($self, $ssl, $ctx) = @_;	1858	my ($self, $tls, $ctx) = @_;
		1859
		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};
		1862
		1863	$self->{tls} = $tls;
		1864	$self->{tls_ctx} = $ctx if @_ > 2;
		1865
		1866	return unless $self->{fh};
1393		1867
1394	require Net::SSLeay;	1868	require Net::SSLeay;
1395		1869
1396	Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object"	1870	$ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL ();
1397	if $self->{tls};	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	}
1398		1888
1399	if ($ssl eq "accept") {	1889	$self->{tls_ctx} = $ctx || TLS_CTX ();
1400	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());	1890	$self->{tls} = $tls = $self->{tls_ctx}->_get_session ($tls, $self, $self->{peername});
1401	Net::SSLeay::set_accept_state ($ssl);
1402	} elsif ($ssl eq "connect") {
1403	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());
1404	Net::SSLeay::set_connect_state ($ssl);
1405	}
1406
1407	$self->{tls} = $ssl;
1408		1891
1409	# basically, this is deep magic (because SSL_read should have the same issues)	1892	# basically, this is deep magic (because SSL_read should have the same issues)
1410	# but the openssl maintainers basically said: "trust us, it just works".	1893	# but the openssl maintainers basically said: "trust us, it just works".
1411	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1894	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1412	# and mismaintained ssleay-module doesn't even offer them).	1895	# and mismaintained ssleay-module doesn't even offer them).
…		…
1416	#	1899	#
1417	# note that we do not try to keep the length constant between writes as we are required to do.	1900	# note that we do not try to keep the length constant between writes as we are required to do.
1418	# we assume that most (but not all) of this insanity only applies to non-blocking cases,	1901	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
1419	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to	1902	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
1420	# have identity issues in that area.	1903	# have identity issues in that area.
1421	Net::SSLeay::CTX_set_mode ($self->{tls},	1904	# Net::SSLeay::CTX_set_mode ($ssl,
1422	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)	1905	# (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)
1423	| (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);
1424		1908
1425	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1909	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1426	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1910	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1427		1911
		1912	Net::SSLeay::BIO_write ($self->{_rbio}, delete $self->{rbuf});
		1913
1428	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	1914	Net::SSLeay::set_bio ($tls, $self->{_rbio}, $self->{_wbio});
		1915
		1916	$self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) }
		1917	if $self->{on_starttls};
1429		1918
1430	&_dotls; # need to trigger the initial handshake	1919	&_dotls; # need to trigger the initial handshake
1431	$self->start_read; # make sure we actually do read	1920	$self->start_read; # make sure we actually do read
1432	}	1921	}
1433		1922
1434	=item $handle->stoptls	1923	=item $handle->stoptls
1435		1924
1436	Shuts down the SSL connection - this makes a proper EOF handshake by	1925	Shuts down the SSL connection - this makes a proper EOF handshake by
1437	sending a close notify to the other side, but since OpenSSL doesn't	1926	sending a close notify to the other side, but since OpenSSL doesn't
1438	support non-blocking shut downs, it is not possible to re-use the stream	1927	support non-blocking shut downs, it is not guarenteed that you can re-use
1439	afterwards.	1928	the stream afterwards.
1440		1929
1441	=cut	1930	=cut
1442		1931
1443	sub stoptls {	1932	sub stoptls {
1444	my ($self) = @_;	1933	my ($self) = @_;
…		…
1446	if ($self->{tls}) {	1935	if ($self->{tls}) {
1447	Net::SSLeay::shutdown ($self->{tls});	1936	Net::SSLeay::shutdown ($self->{tls});
1448		1937
1449	&_dotls;	1938	&_dotls;
1450		1939
1451	# we don't give a shit. no, we do, but we can't. no...	1940	# # we don't give a shit. no, we do, but we can't. no...#d#
1452	# we, we... have to use openssl :/	1941	# # we, we... have to use openssl :/#d#
1453	&_freetls;	1942	# &_freetls;#d#
1454	}	1943	}
1455	}	1944	}
1456		1945
1457	sub _freetls {	1946	sub _freetls {
1458	my ($self) = @_;	1947	my ($self) = @_;
1459		1948
1460	return unless $self->{tls};	1949	return unless $self->{tls};
1461		1950
1462	Net::SSLeay::free (delete $self->{tls});	1951	$self->{tls_ctx}->_put_session (delete $self->{tls})
		1952	if $self->{tls} > 0;
1463		1953
1464	delete @$self{qw(_rbio _wbio _tls_wbuf)};	1954	delete @$self{qw(_rbio _wbio _tls_wbuf _on_starttls)};
1465	}	1955	}
1466		1956
1467	sub DESTROY {	1957	sub DESTROY {
1468	my $self = shift;	1958	my ($self) = @_;
1469		1959
1470	&_freetls;	1960	&_freetls;
1471		1961
1472	my $linger = exists $self->{linger} ? $self->{linger} : 3600;	1962	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
1473		1963
1474	if ($linger && length $self->{wbuf}) {	1964	if ($linger && length $self->{wbuf} && $self->{fh}) {
1475	my $fh = delete $self->{fh};	1965	my $fh = delete $self->{fh};
1476	my $wbuf = delete $self->{wbuf};	1966	my $wbuf = delete $self->{wbuf};
1477		1967
1478	my @linger;	1968	my @linger;
1479		1969
1480	push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub {	1970	push @linger, AE::io $fh, 1, sub {
1481	my $len = syswrite $fh, $wbuf, length $wbuf;	1971	my $len = syswrite $fh, $wbuf, length $wbuf;
1482		1972
1483	if ($len > 0) {	1973	if ($len > 0) {
1484	substr $wbuf, 0, $len, "";	1974	substr $wbuf, 0, $len, "";
1485	} else {	1975	} else {
1486	@linger = (); # end	1976	@linger = (); # end
1487	}	1977	}
1488	});	1978	};
1489	push @linger, AnyEvent->timer (after => $linger, cb => sub {	1979	push @linger, AE::timer $linger, 0, sub {
1490	@linger = ();	1980	@linger = ();
1491	});	1981	};
1492	}	1982	}
1493	}	1983	}
1494		1984
1495	=item $handle->destroy	1985	=item $handle->destroy
1496		1986
1497	Shuts down the handle object as much as possible - this call ensures that	1987	Shuts down the handle object as much as possible - this call ensures that
1498	no further callbacks will be invoked and resources will be freed as much	1988	no further callbacks will be invoked and as many resources as possible
1499	as possible. You must not call any methods on the object afterwards.	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).
1500		1992
1501	Normally, you can just "forget" any references to an AnyEvent::Handle	1993	Normally, you can just "forget" any references to an AnyEvent::Handle
1502	object and it will simply shut down. This works in fatal error and EOF	1994	object and it will simply shut down. This works in fatal error and EOF
1503	callbacks, as well as code outside. It does I<NOT> work in a read or write	1995	callbacks, as well as code outside. It does I<NOT> work in a read or write
1504	callback, so when you want to destroy the AnyEvent::Handle object from	1996	callback, so when you want to destroy the AnyEvent::Handle object from
1505	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in	1997	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
1506	that case.	1998	that case.
1507		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
1508	The handle might still linger in the background and write out remaining	2005	The handle might still linger in the background and write out remaining
1509	data, as specified by the C<linger> option, however.	2006	data, as specified by the C<linger> option, however.
1510		2007
1511	=cut	2008	=cut
1512		2009
1513	sub destroy {	2010	sub destroy {
1514	my ($self) = @_;	2011	my ($self) = @_;
1515		2012
1516	$self->DESTROY;	2013	$self->DESTROY;
1517	%$self = ();	2014	%$self = ();
		2015	bless $self, "AnyEvent::Handle::destroyed";
		2016	}
		2017
		2018	sub AnyEvent::Handle::destroyed::AUTOLOAD {
		2019	#nop
1518	}	2020	}
1519		2021
1520	=item AnyEvent::Handle::TLS_CTX	2022	=item AnyEvent::Handle::TLS_CTX
1521		2023
1522	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
1523	default for TLS mode.	2025	for TLS mode.
1524		2026
1525	The context is created like this:	2027	The context is created by calling L<AnyEvent::TLS> without any arguments.
1526
1527	Net::SSLeay::load_error_strings;
1528	Net::SSLeay::SSLeay_add_ssl_algorithms;
1529	Net::SSLeay::randomize;
1530
1531	my $CTX = Net::SSLeay::CTX_new;
1532
1533	Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL
1534		2028
1535	=cut	2029	=cut
1536		2030
1537	our $TLS_CTX;	2031	our $TLS_CTX;
1538		2032
1539	sub TLS_CTX() {	2033	sub TLS_CTX() {
1540	$TLS_CTX || do {	2034	$TLS_CTX ||= do {
1541	require Net::SSLeay;	2035	require AnyEvent::TLS;
1542		2036
1543	Net::SSLeay::load_error_strings ();	2037	new AnyEvent::TLS
1544	Net::SSLeay::SSLeay_add_ssl_algorithms ();
1545	Net::SSLeay::randomize ();
1546
1547	$TLS_CTX = Net::SSLeay::CTX_new ();
1548
1549	Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ());
1550
1551	$TLS_CTX
1552	}	2038	}
1553	}	2039	}
1554		2040
1555	=back	2041	=back
1556		2042
…		…
1595		2081
1596	$handle->on_read (sub { });	2082	$handle->on_read (sub { });
1597	$handle->on_eof (undef);	2083	$handle->on_eof (undef);
1598	$handle->on_error (sub {	2084	$handle->on_error (sub {
1599	my $data = delete $_[0]{rbuf};	2085	my $data = delete $_[0]{rbuf};
1600	undef $handle;
1601	});	2086	});
1602		2087
1603	The reason to use C<on_error> is that TCP connections, due to latencies	2088	The reason to use C<on_error> is that TCP connections, due to latencies
1604	and packets loss, might get closed quite violently with an error, when in	2089	and packets loss, might get closed quite violently with an error, when in
1605	fact, all data has been received.	2090	fact, all data has been received.
…		…
1621	$handle->on_drain (sub {	2106	$handle->on_drain (sub {
1622	warn "all data submitted to the kernel\n";	2107	warn "all data submitted to the kernel\n";
1623	undef $handle;	2108	undef $handle;
1624	});	2109	});
1625		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
1626	=back	2199	=back
1627		2200
1628		2201
1629	=head1 SUBCLASSING AnyEvent::Handle	2202	=head1 SUBCLASSING AnyEvent::Handle
1630		2203

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