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Revision 1.192 by root, Fri Mar 12 23:22:14 2010 UTC

1	package AnyEvent::Handle;
2
3	no warnings;
4	use strict qw(subs vars);
5
6	use AnyEvent ();
7	use AnyEvent::Util qw(WSAEWOULDBLOCK);
8	use Scalar::Util ();
9	use Carp ();
10	use Fcntl ();
11	use Errno qw(EAGAIN EINTR);
12
13	=head1 NAME	1	=head1 NAME
14		2
15	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent	3	AnyEvent::Handle - non-blocking I/O on 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::Handle 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_stoptls {
		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	->($self, @_);
552	}	906	}
553		907
		908	# we downgrade here to avoid hard-to-track-down bugs,
		909	# and diagnose the problem earlier and better.
		910
554	if ($self->{tls}) {	911	if ($self->{tls}) {
555	$self->{_tls_wbuf} .= $_[0];	912	utf8::downgrade $self->{_tls_wbuf} .= $_[0];
556		913	&_dotls ($self) if $self->{fh};
557	&_dotls ($self);
558	} else {	914	} else {
559	$self->{wbuf} .= $_[0];	915	utf8::downgrade $self->{wbuf} .= $_[0];
560	$self->_drain_wbuf;	916	$self->_drain_wbuf if $self->{fh};
561	}	917	}
562	}	918	}
563		919
564	=item $handle->push_write (type => @args)	920	=item $handle->push_write (type => @args)
565		921
566	Instead of formatting your data yourself, you can also let this module do	922	Instead of formatting your data yourself, you can also let this module
567	the job by specifying a type and type-specific arguments.	923	do the job by specifying a type and type-specific arguments. You
		924	can also specify the (fully qualified) name of a package, in which
		925	case AnyEvent tries to load the package and then expects to find the
		926	C<anyevent_read_type> function inside (see "custom write types", below).
568		927
569	Predefined types are (if you have ideas for additional types, feel free to	928	Predefined types are (if you have ideas for additional types, feel free to
570	drop by and tell us):	929	drop by and tell us):
571		930
572	=over 4	931	=over 4
…		…
629	Other languages could read single lines terminated by a newline and pass	988	Other languages could read single lines terminated by a newline and pass
630	this line into their JSON decoder of choice.	989	this line into their JSON decoder of choice.
631		990
632	=cut	991	=cut
633		992
		993	sub json_coder() {
		994	eval { require JSON::XS; JSON::XS->new->utf8 }
		995	|| do { require JSON; JSON->new->utf8 }
		996	}
		997
634	register_write_type json => sub {	998	register_write_type json => sub {
635	my ($self, $ref) = @_;	999	my ($self, $ref) = @_;
636		1000
637	require JSON;	1001	my $json = $self->{json} ||= json_coder;
638		1002
639	$self->{json} ? $self->{json}->encode ($ref)	1003	$json->encode ($ref)
640	: JSON::encode_json ($ref)
641	};	1004	};
642		1005
643	=item storable => $reference	1006	=item storable => $reference
644		1007
645	Freezes the given reference using L<Storable> and writes it to the	1008	Freezes the given reference using L<Storable> and writes it to the
…		…
655	pack "w/a*", Storable::nfreeze ($ref)	1018	pack "w/a*", Storable::nfreeze ($ref)
656	};	1019	};
657		1020
658	=back	1021	=back
659		1022
660	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)	1023	=item $handle->push_shutdown
661		1024
662	This function (not method) lets you add your own types to C<push_write>.	1025	Sometimes you know you want to close the socket after writing your data
		1026	before it was actually written. One way to do that is to replace your
		1027	C<on_drain> handler by a callback that shuts down the socket (and set
		1028	C<low_water_mark> to C<0>). This method is a shorthand for just that, and
		1029	replaces the C<on_drain> callback with:
		1030
		1031	sub { shutdown $_[0]{fh}, 1 } # for push_shutdown
		1032
		1033	This simply shuts down the write side and signals an EOF condition to the
		1034	the peer.
		1035
		1036	You can rely on the normal read queue and C<on_eof> handling
		1037	afterwards. This is the cleanest way to close a connection.
		1038
		1039	=cut
		1040
		1041	sub push_shutdown {
		1042	my ($self) = @_;
		1043
		1044	delete $self->{low_water_mark};
		1045	$self->on_drain (sub { shutdown $_[0]{fh}, 1 });
		1046	}
		1047
		1048	=item custom write types - Package::anyevent_write_type $handle, @args
		1049
		1050	Instead of one of the predefined types, you can also specify the name of
		1051	a package. AnyEvent will try to load the package and then expects to find
		1052	a function named C<anyevent_write_type> inside. If it isn't found, it
		1053	progressively tries to load the parent package until it either finds the
		1054	function (good) or runs out of packages (bad).
		1055
663	Whenever the given C<type> is used, C<push_write> will invoke the code	1056	Whenever the given C<type> is used, C<push_write> will the function with
664	reference with the handle object and the remaining arguments.	1057	the handle object and the remaining arguments.
665		1058
666	The code reference is supposed to return a single octet string that will	1059	The function is supposed to return a single octet string that will be
667	be appended to the write buffer.	1060	appended to the write buffer, so you cna mentally treat this function as a
		1061	"arguments to on-the-wire-format" converter.
668		1062
669	Note that this is a function, and all types registered this way will be	1063	Example: implement a custom write type C<join> that joins the remaining
670	global, so try to use unique names.	1064	arguments using the first one.
		1065
		1066	$handle->push_write (My::Type => " ", 1,2,3);
		1067
		1068	# uses the following package, which can be defined in the "My::Type" or in
		1069	# the "My" modules to be auto-loaded, or just about anywhere when the
		1070	# My::Type::anyevent_write_type is defined before invoking it.
		1071
		1072	package My::Type;
		1073
		1074	sub anyevent_write_type {
		1075	my ($handle, $delim, @args) = @_;
		1076
		1077	join $delim, @args
		1078	}
671		1079
672	=cut	1080	=cut
673		1081
674	#############################################################################	1082	#############################################################################
675		1083
…		…
757	=cut	1165	=cut
758		1166
759	sub _drain_rbuf {	1167	sub _drain_rbuf {
760	my ($self) = @_;	1168	my ($self) = @_;
761		1169
		1170	# avoid recursion
		1171	return if $self->{_skip_drain_rbuf};
762	local $self->{_in_drain} = 1;	1172	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		1173
771	while () {	1174	while () {
		1175	# we need to use a separate tls read buffer, as we must not receive data while
		1176	# we are draining the buffer, and this can only happen with TLS.
		1177	$self->{rbuf} .= delete $self->{_tls_rbuf}
		1178	if exists $self->{_tls_rbuf};
		1179
772	my $len = length $self->{rbuf};	1180	my $len = length $self->{rbuf};
773		1181
774	if (my $cb = shift @{ $self->{_queue} }) {	1182	if (my $cb = shift @{ $self->{_queue} }) {
775	unless ($cb->($self)) {	1183	unless ($cb->($self)) {
776	if ($self->{_eof}) {	1184	# no progress can be made
777	# no progress can be made (not enough data and no data forthcoming)	1185	# (not enough data and no data forthcoming)
778	$self->_error (&Errno::EPIPE, 1), return;	1186	$self->_error (Errno::EPIPE, 1), return
779	}	1187	if $self->{_eof};
780		1188
781	unshift @{ $self->{_queue} }, $cb;	1189	unshift @{ $self->{_queue} }, $cb;
782	last;	1190	last;
783	}	1191	}
784	} elsif ($self->{on_read}) {	1192	} elsif ($self->{on_read}) {
…		…
791	&& !@{ $self->{_queue} } # and the queue is still empty	1199	&& !@{ $self->{_queue} } # and the queue is still empty
792	&& $self->{on_read} # but we still have on_read	1200	&& $self->{on_read} # but we still have on_read
793	) {	1201	) {
794	# no further data will arrive	1202	# no further data will arrive
795	# so no progress can be made	1203	# so no progress can be made
796	$self->_error (&Errno::EPIPE, 1), return	1204	$self->_error (Errno::EPIPE, 1), return
797	if $self->{_eof};	1205	if $self->{_eof};
798		1206
799	last; # more data might arrive	1207	last; # more data might arrive
800	}	1208	}
801	} else {	1209	} else {
…		…
804	last;	1212	last;
805	}	1213	}
806	}	1214	}
807		1215
808	if ($self->{_eof}) {	1216	if ($self->{_eof}) {
809	if ($self->{on_eof}) {	1217	$self->{on_eof}
810	$self->{on_eof}($self)	1218	? $self->{on_eof}($self)
811	} else {	1219	: $self->_error (0, 1, "Unexpected end-of-file");
812	$self->_error (0, 1);	1220
813	}	1221	return;
		1222	}
		1223
		1224	if (
		1225	defined $self->{rbuf_max}
		1226	&& $self->{rbuf_max} < length $self->{rbuf}
		1227	) {
		1228	$self->_error (Errno::ENOSPC, 1), return;
814	}	1229	}
815		1230
816	# may need to restart read watcher	1231	# may need to restart read watcher
817	unless ($self->{_rw}) {	1232	unless ($self->{_rw}) {
818	$self->start_read	1233	$self->start_read
…		…
830		1245
831	sub on_read {	1246	sub on_read {
832	my ($self, $cb) = @_;	1247	my ($self, $cb) = @_;
833		1248
834	$self->{on_read} = $cb;	1249	$self->{on_read} = $cb;
835	$self->_drain_rbuf if $cb && !$self->{_in_drain};	1250	$self->_drain_rbuf if $cb;
836	}	1251	}
837		1252
838	=item $handle->rbuf	1253	=item $handle->rbuf
839		1254
840	Returns the read buffer (as a modifiable lvalue).	1255	Returns the read buffer (as a modifiable lvalue).
841		1256
842	You can access the read buffer directly as the C<< ->{rbuf} >> member, if	1257	You can access the read buffer directly as the C<< ->{rbuf} >>
843	you want.	1258	member, if you want. However, the only operation allowed on the
		1259	read buffer (apart from looking at it) is removing data from its
		1260	beginning. Otherwise modifying or appending to it is not allowed and will
		1261	lead to hard-to-track-down bugs.
844		1262
845	NOTE: The read buffer should only be used or modified if the C<on_read>,	1263	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	1264	C<push_read> or C<unshift_read> methods are used. The other read methods
847	automatically manage the read buffer.	1265	automatically manage the read buffer.
848		1266
…		…
884	my $cb = pop;	1302	my $cb = pop;
885		1303
886	if (@_) {	1304	if (@_) {
887	my $type = shift;	1305	my $type = shift;
888		1306
		1307	$cb = ($RH{$type} ||= _load_func "$type\::anyevent_read_type"
889	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")	1308	or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::push_read")
890	->($self, $cb, @_);	1309	->($self, $cb, @_);
891	}	1310	}
892		1311
893	push @{ $self->{_queue} }, $cb;	1312	push @{ $self->{_queue} }, $cb;
894	$self->_drain_rbuf unless $self->{_in_drain};	1313	$self->_drain_rbuf;
895	}	1314	}
896		1315
897	sub unshift_read {	1316	sub unshift_read {
898	my $self = shift;	1317	my $self = shift;
899	my $cb = pop;	1318	my $cb = pop;
…		…
903		1322
904	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read")	1323	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read")
905	->($self, $cb, @_);	1324	->($self, $cb, @_);
906	}	1325	}
907		1326
908
909	unshift @{ $self->{_queue} }, $cb;	1327	unshift @{ $self->{_queue} }, $cb;
910	$self->_drain_rbuf unless $self->{_in_drain};	1328	$self->_drain_rbuf;
911	}	1329	}
912		1330
913	=item $handle->push_read (type => @args, $cb)	1331	=item $handle->push_read (type => @args, $cb)
914		1332
915	=item $handle->unshift_read (type => @args, $cb)	1333	=item $handle->unshift_read (type => @args, $cb)
916		1334
917	Instead of providing a callback that parses the data itself you can chose	1335	Instead of providing a callback that parses the data itself you can chose
918	between a number of predefined parsing formats, for chunks of data, lines	1336	between a number of predefined parsing formats, for chunks of data, lines
919	etc.	1337	etc. You can also specify the (fully qualified) name of a package, in
		1338	which case AnyEvent tries to load the package and then expects to find the
		1339	C<anyevent_read_type> function inside (see "custom read types", below).
920		1340
921	Predefined types are (if you have ideas for additional types, feel free to	1341	Predefined types are (if you have ideas for additional types, feel free to
922	drop by and tell us):	1342	drop by and tell us):
923		1343
924	=over 4	1344	=over 4
…		…
1048	return 1;	1468	return 1;
1049	}	1469	}
1050		1470
1051	# reject	1471	# reject
1052	if ($reject && $$rbuf =~ $reject) {	1472	if ($reject && $$rbuf =~ $reject) {
1053	$self->_error (&Errno::EBADMSG);	1473	$self->_error (Errno::EBADMSG);
1054	}	1474	}
1055		1475
1056	# skip	1476	# skip
1057	if ($skip && $$rbuf =~ $skip) {	1477	if ($skip && $$rbuf =~ $skip) {
1058	$data .= substr $$rbuf, 0, $+[0], "";	1478	$data .= substr $$rbuf, 0, $+[0], "";
…		…
1074	my ($self, $cb) = @_;	1494	my ($self, $cb) = @_;
1075		1495
1076	sub {	1496	sub {
1077	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {	1497	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {
1078	if ($_[0]{rbuf} =~ /[^0-9]/) {	1498	if ($_[0]{rbuf} =~ /[^0-9]/) {
1079	$self->_error (&Errno::EBADMSG);	1499	$self->_error (Errno::EBADMSG);
1080	}	1500	}
1081	return;	1501	return;
1082	}	1502	}
1083		1503
1084	my $len = $1;	1504	my $len = $1;
…		…
1087	my $string = $_[1];	1507	my $string = $_[1];
1088	$_[0]->unshift_read (chunk => 1, sub {	1508	$_[0]->unshift_read (chunk => 1, sub {
1089	if ($_[1] eq ",") {	1509	if ($_[1] eq ",") {
1090	$cb->($_[0], $string);	1510	$cb->($_[0], $string);
1091	} else {	1511	} else {
1092	$self->_error (&Errno::EBADMSG);	1512	$self->_error (Errno::EBADMSG);
1093	}	1513	}
1094	});	1514	});
1095	});	1515	});
1096		1516
1097	1	1517	1
…		…
1164	=cut	1584	=cut
1165		1585
1166	register_read_type json => sub {	1586	register_read_type json => sub {
1167	my ($self, $cb) = @_;	1587	my ($self, $cb) = @_;
1168		1588
1169	require JSON;	1589	my $json = $self->{json} ||= json_coder;
1170		1590
1171	my $data;	1591	my $data;
1172	my $rbuf = \$self->{rbuf};	1592	my $rbuf = \$self->{rbuf};
1173		1593
1174	my $json = $self->{json} ||= JSON->new->utf8;
1175
1176	sub {	1594	sub {
1177	eval {
1178	my $ref = $json->incr_parse ($self->{rbuf});	1595	my $ref = eval { $json->incr_parse ($self->{rbuf}) };
1179		1596
1180	if ($ref) {	1597	if ($ref) {
1181	$self->{rbuf} = $json->incr_text;	1598	$self->{rbuf} = $json->incr_text;
1182	$json->incr_text = "";	1599	$json->incr_text = "";
1183	$cb->($self, $ref);	1600	$cb->($self, $ref);
1184
1185	1
1186	} else {
1187	$self->{rbuf} = "";
1188	()
1189	}
1190		1601
1191	1	1602	1
1192	} or do {	1603	} elsif ($@) {
1193	# error case	1604	# error case
1194	$json->incr_skip;	1605	$json->incr_skip;
1195		1606
1196	$self->{rbuf} = $json->incr_text;	1607	$self->{rbuf} = $json->incr_text;
1197	$json->incr_text = "";	1608	$json->incr_text = "";
1198		1609
1199	$self->_error (&Errno::EBADMSG);	1610	$self->_error (Errno::EBADMSG);
		1611
		1612	()
		1613	} else {
		1614	$self->{rbuf} = "";
		1615
		1616	()
1200	};	1617	}
1201	}	1618	}
1202	};	1619	};
1203		1620
1204	=item storable => $cb->($handle, $ref)	1621	=item storable => $cb->($handle, $ref)
1205		1622
…		…
1235	# read remaining chunk	1652	# read remaining chunk
1236	$_[0]->unshift_read (chunk => $len, sub {	1653	$_[0]->unshift_read (chunk => $len, sub {
1237	if (my $ref = eval { Storable::thaw ($_[1]) }) {	1654	if (my $ref = eval { Storable::thaw ($_[1]) }) {
1238	$cb->($_[0], $ref);	1655	$cb->($_[0], $ref);
1239	} else {	1656	} else {
1240	$self->_error (&Errno::EBADMSG);	1657	$self->_error (Errno::EBADMSG);
1241	}	1658	}
1242	});	1659	});
1243	}	1660	}
1244		1661
1245	1	1662	1
1246	}	1663	}
1247	};	1664	};
1248		1665
1249	=back	1666	=back
1250		1667
1251	=item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args)	1668	=item custom read types - Package::anyevent_read_type $handle, $cb, @args
1252		1669
1253	This function (not method) lets you add your own types to C<push_read>.	1670	Instead of one of the predefined types, you can also specify the name
		1671	of a package. AnyEvent will try to load the package and then expects to
		1672	find a function named C<anyevent_read_type> inside. If it isn't found, it
		1673	progressively tries to load the parent package until it either finds the
		1674	function (good) or runs out of packages (bad).
1254		1675
1255	Whenever the given C<type> is used, C<push_read> will invoke the code	1676	Whenever this type is used, C<push_read> will invoke the function with the
1256	reference with the handle object, the callback and the remaining	1677	handle object, the original callback and the remaining arguments.
1257	arguments.
1258		1678
1259	The code reference is supposed to return a callback (usually a closure)	1679	The function is supposed to return a callback (usually a closure) that
1260	that works as a plain read callback (see C<< ->push_read ($cb) >>).	1680	works as a plain read callback (see C<< ->push_read ($cb) >>), so you can
		1681	mentally treat the function as a "configurable read type to read callback"
		1682	converter.
1261		1683
1262	It should invoke the passed callback when it is done reading (remember to	1684	It should invoke the original callback when it is done reading (remember
1263	pass C<$handle> as first argument as all other callbacks do that).	1685	to pass C<$handle> as first argument as all other callbacks do that,
		1686	although there is no strict requirement on this).
1264		1687
1265	Note that this is a function, and all types registered this way will be
1266	global, so try to use unique names.
1267
1268	For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>,	1688	For examples, see the source of this module (F<perldoc -m
1269	search for C<register_read_type>)).	1689	AnyEvent::Handle>, search for C<register_read_type>)).
1270		1690
1271	=item $handle->stop_read	1691	=item $handle->stop_read
1272		1692
1273	=item $handle->start_read	1693	=item $handle->start_read
1274		1694
…		…
1294	}	1714	}
1295		1715
1296	sub start_read {	1716	sub start_read {
1297	my ($self) = @_;	1717	my ($self) = @_;
1298		1718
1299	unless ($self->{_rw} || $self->{_eof}) {	1719	unless ($self->{_rw} || $self->{_eof} || !$self->{fh}) {
1300	Scalar::Util::weaken $self;	1720	Scalar::Util::weaken $self;
1301		1721
1302	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1722	$self->{_rw} = AE::io $self->{fh}, 0, sub {
1303	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});	1723	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1304	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;	1724	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;
1305		1725
1306	if ($len > 0) {	1726	if ($len > 0) {
1307	$self->{_activity} = AnyEvent->now;	1727	$self->{_activity} = $self->{_ractivity} = AE::now;
1308		1728
1309	if ($self->{tls}) {	1729	if ($self->{tls}) {
1310	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);	1730	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1311		1731
1312	&_dotls ($self);	1732	&_dotls ($self);
1313	} else {	1733	} else {
1314	$self->_drain_rbuf unless $self->{_in_drain};	1734	$self->_drain_rbuf;
1315	}	1735	}
1316		1736
1317	} elsif (defined $len) {	1737	} elsif (defined $len) {
1318	delete $self->{_rw};	1738	delete $self->{_rw};
1319	$self->{_eof} = 1;	1739	$self->{_eof} = 1;
1320	$self->_drain_rbuf unless $self->{_in_drain};	1740	$self->_drain_rbuf;
1321		1741
1322	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	1742	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
1323	return $self->_error ($!, 1);	1743	return $self->_error ($!, 1);
1324	}	1744	}
1325	});	1745	};
		1746	}
		1747	}
		1748
		1749	our $ERROR_SYSCALL;
		1750	our $ERROR_WANT_READ;
		1751
		1752	sub _tls_error {
		1753	my ($self, $err) = @_;
		1754
		1755	return $self->_error ($!, 1)
		1756	if $err == Net::SSLeay::ERROR_SYSCALL ();
		1757
		1758	my $err =Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ());
		1759
		1760	# reduce error string to look less scary
		1761	$err =~ s/^error:[0-9a-fA-F]{8}:[^:]+:([^:]+):/\L$1: /;
		1762
		1763	if ($self->{_on_starttls}) {
		1764	(delete $self->{_on_starttls})->($self, undef, $err);
		1765	&_freetls;
		1766	} else {
		1767	&_freetls;
		1768	$self->_error (Errno::EPROTO, 1, $err);
1326	}	1769	}
1327	}	1770	}
1328		1771
1329	# poll the write BIO and send the data if applicable	1772	# poll the write BIO and send the data if applicable
		1773	# also decode read data if possible
		1774	# this is basiclaly our TLS state machine
		1775	# more efficient implementations are possible with openssl,
		1776	# but not with the buggy and incomplete Net::SSLeay.
1330	sub _dotls {	1777	sub _dotls {
1331	my ($self) = @_;	1778	my ($self) = @_;
1332		1779
1333	my $tmp;	1780	my $tmp;
1334		1781
1335	if (length $self->{_tls_wbuf}) {	1782	if (length $self->{_tls_wbuf}) {
1336	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1783	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1337	substr $self->{_tls_wbuf}, 0, $tmp, "";	1784	substr $self->{_tls_wbuf}, 0, $tmp, "";
1338	}	1785	}
		1786
		1787	$tmp = Net::SSLeay::get_error ($self->{tls}, $tmp);
		1788	return $self->_tls_error ($tmp)
		1789	if $tmp != $ERROR_WANT_READ
		1790	&& ($tmp != $ERROR_SYSCALL || $!);
1339	}	1791	}
1340		1792
1341	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {	1793	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
1342	unless (length $tmp) {	1794	unless (length $tmp) {
1343	# let's treat SSL-eof as we treat normal EOF	1795	$self->{_on_starttls}
1344	delete $self->{_rw};	1796	and (delete $self->{_on_starttls})->($self, undef, "EOF during handshake"); # ???
1345	$self->{_eof} = 1;
1346	&_freetls;	1797	&_freetls;
		1798
		1799	if ($self->{on_stoptls}) {
		1800	$self->{on_stoptls}($self);
		1801	return;
		1802	} else {
		1803	# let's treat SSL-eof as we treat normal EOF
		1804	delete $self->{_rw};
		1805	$self->{_eof} = 1;
		1806	}
1347	}	1807	}
1348		1808
1349	$self->{rbuf} .= $tmp;	1809	$self->{_tls_rbuf} .= $tmp;
1350	$self->_drain_rbuf unless $self->{_in_drain};	1810	$self->_drain_rbuf;
1351	$self->{tls} or return; # tls session might have gone away in callback	1811	$self->{tls} or return; # tls session might have gone away in callback
1352	}	1812	}
1353		1813
1354	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);	1814	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
1355
1356	if ($tmp != Net::SSLeay::ERROR_WANT_READ ()) {
1357	if ($tmp == Net::SSLeay::ERROR_SYSCALL ()) {
1358	return $self->_error ($!, 1);	1815	return $self->_tls_error ($tmp)
1359	} elsif ($tmp == Net::SSLeay::ERROR_SSL ()) {	1816	if $tmp != $ERROR_WANT_READ
1360	return $self->_error (&Errno::EIO, 1);	1817	&& ($tmp != $ERROR_SYSCALL || $!);
1361	}
1362
1363	# all other errors are fine for our purposes
1364	}
1365		1818
1366	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {	1819	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1367	$self->{wbuf} .= $tmp;	1820	$self->{wbuf} .= $tmp;
1368	$self->_drain_wbuf;	1821	$self->_drain_wbuf;
		1822	$self->{tls} or return; # tls session might have gone away in callback
1369	}	1823	}
		1824
		1825	$self->{_on_starttls}
		1826	and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK ()
		1827	and (delete $self->{_on_starttls})->($self, 1, "TLS/SSL connection established");
1370	}	1828	}
1371		1829
1372	=item $handle->starttls ($tls[, $tls_ctx])	1830	=item $handle->starttls ($tls[, $tls_ctx])
1373		1831
1374	Instead of starting TLS negotiation immediately when the AnyEvent::Handle	1832	Instead of starting TLS negotiation immediately when the AnyEvent::Handle
1375	object is created, you can also do that at a later time by calling	1833	object is created, you can also do that at a later time by calling
1376	C<starttls>.	1834	C<starttls>.
1377		1835
		1836	Starting TLS is currently an asynchronous operation - when you push some
		1837	write data and then call C<< ->starttls >> then TLS negotiation will start
		1838	immediately, after which the queued write data is then sent.
		1839
1378	The first argument is the same as the C<tls> constructor argument (either	1840	The first argument is the same as the C<tls> constructor argument (either
1379	C<"connect">, C<"accept"> or an existing Net::SSLeay object).	1841	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
1380		1842
1381	The second argument is the optional C<Net::SSLeay::CTX> object that is	1843	The second argument is the optional C<AnyEvent::TLS> object that is used
1382	used when AnyEvent::Handle has to create its own TLS connection object.	1844	when AnyEvent::Handle has to create its own TLS connection object, or
		1845	a hash reference with C<< key => value >> pairs that will be used to
		1846	construct a new context.
1383		1847
1384	The TLS connection object will end up in C<< $handle->{tls} >> after this	1848	The TLS connection object will end up in C<< $handle->{tls} >>, the TLS
1385	call and can be used or changed to your liking. Note that the handshake	1849	context in C<< $handle->{tls_ctx} >> after this call and can be used or
1386	might have already started when this function returns.	1850	changed to your liking. Note that the handshake might have already started
		1851	when this function returns.
1387		1852
1388	If it an error to start a TLS handshake more than once per	1853	Due to bugs in OpenSSL, it might or might not be possible to do multiple
1389	AnyEvent::Handle object (this is due to bugs in OpenSSL).	1854	handshakes on the same stream. Best do not attempt to use the stream after
		1855	stopping TLS.
1390		1856
1391	=cut	1857	=cut
		1858
		1859	our %TLS_CACHE; #TODO not yet documented, should we?
1392		1860
1393	sub starttls {	1861	sub starttls {
1394	my ($self, $ssl, $ctx) = @_;	1862	my ($self, $tls, $ctx) = @_;
		1863
		1864	Carp::croak "It is an error to call starttls on an AnyEvent::Handle object while TLS is already active, caught"
		1865	if $self->{tls};
		1866
		1867	$self->{tls} = $tls;
		1868	$self->{tls_ctx} = $ctx if @_ > 2;
		1869
		1870	return unless $self->{fh};
1395		1871
1396	require Net::SSLeay;	1872	require Net::SSLeay;
1397		1873
1398	Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object"	1874	$ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL ();
1399	if $self->{tls};	1875	$ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ ();
		1876
		1877	$tls = delete $self->{tls};
		1878	$ctx = $self->{tls_ctx};
		1879
		1880	local $Carp::CarpLevel = 1; # skip ourselves when creating a new context or session
		1881
		1882	if ("HASH" eq ref $ctx) {
		1883	require AnyEvent::TLS;
		1884
		1885	if ($ctx->{cache}) {
		1886	my $key = $ctx+0;
		1887	$ctx = $TLS_CACHE{$key} ||= new AnyEvent::TLS %$ctx;
		1888	} else {
		1889	$ctx = new AnyEvent::TLS %$ctx;
		1890	}
		1891	}
1400		1892
1401	if ($ssl eq "accept") {	1893	$self->{tls_ctx} = $ctx || TLS_CTX ();
1402	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());	1894	$self->{tls} = $tls = $self->{tls_ctx}->_get_session ($tls, $self, $self->{peername});
1403	Net::SSLeay::set_accept_state ($ssl);
1404	} elsif ($ssl eq "connect") {
1405	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());
1406	Net::SSLeay::set_connect_state ($ssl);
1407	}
1408
1409	$self->{tls} = $ssl;
1410		1895
1411	# basically, this is deep magic (because SSL_read should have the same issues)	1896	# basically, this is deep magic (because SSL_read should have the same issues)
1412	# but the openssl maintainers basically said: "trust us, it just works".	1897	# but the openssl maintainers basically said: "trust us, it just works".
1413	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1898	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1414	# and mismaintained ssleay-module doesn't even offer them).	1899	# and mismaintained ssleay-module doesn't even offer them).
…		…
1418	#	1903	#
1419	# note that we do not try to keep the length constant between writes as we are required to do.	1904	# note that we do not try to keep the length constant between writes as we are required to do.
1420	# we assume that most (but not all) of this insanity only applies to non-blocking cases,	1905	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
1421	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to	1906	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
1422	# have identity issues in that area.	1907	# have identity issues in that area.
1423	Net::SSLeay::CTX_set_mode ($self->{tls},	1908	# Net::SSLeay::CTX_set_mode ($ssl,
1424	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)	1909	# (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)
1425	| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));	1910	# | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));
		1911	Net::SSLeay::CTX_set_mode ($tls, 1|2);
1426		1912
1427	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1913	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1428	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1914	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1429		1915
		1916	Net::SSLeay::BIO_write ($self->{_rbio}, delete $self->{rbuf});
		1917
1430	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	1918	Net::SSLeay::set_bio ($tls, $self->{_rbio}, $self->{_wbio});
		1919
		1920	$self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) }
		1921	if $self->{on_starttls};
1431		1922
1432	&_dotls; # need to trigger the initial handshake	1923	&_dotls; # need to trigger the initial handshake
1433	$self->start_read; # make sure we actually do read	1924	$self->start_read; # make sure we actually do read
1434	}	1925	}
1435		1926
1436	=item $handle->stoptls	1927	=item $handle->stoptls
1437		1928
1438	Shuts down the SSL connection - this makes a proper EOF handshake by	1929	Shuts down the SSL connection - this makes a proper EOF handshake by
1439	sending a close notify to the other side, but since OpenSSL doesn't	1930	sending a close notify to the other side, but since OpenSSL doesn't
1440	support non-blocking shut downs, it is not possible to re-use the stream	1931	support non-blocking shut downs, it is not guaranteed that you can re-use
1441	afterwards.	1932	the stream afterwards.
1442		1933
1443	=cut	1934	=cut
1444		1935
1445	sub stoptls {	1936	sub stoptls {
1446	my ($self) = @_;	1937	my ($self) = @_;
1447		1938
1448	if ($self->{tls}) {	1939	if ($self->{tls} && $self->{fh}) {
1449	Net::SSLeay::shutdown ($self->{tls});	1940	Net::SSLeay::shutdown ($self->{tls});
1450		1941
1451	&_dotls;	1942	&_dotls;
1452		1943
1453	# we don't give a shit. no, we do, but we can't. no...	1944	# # we don't give a shit. no, we do, but we can't. no...#d#
1454	# we, we... have to use openssl :/	1945	# # we, we... have to use openssl :/#d#
1455	&_freetls;	1946	# &_freetls;#d#
1456	}	1947	}
1457	}	1948	}
1458		1949
1459	sub _freetls {	1950	sub _freetls {
1460	my ($self) = @_;	1951	my ($self) = @_;
1461		1952
1462	return unless $self->{tls};	1953	return unless $self->{tls};
1463		1954
1464	Net::SSLeay::free (delete $self->{tls});	1955	$self->{tls_ctx}->_put_session (delete $self->{tls})
		1956	if $self->{tls} > 0;
1465		1957
1466	delete @$self{qw(_rbio _wbio _tls_wbuf)};	1958	delete @$self{qw(_rbio _wbio _tls_wbuf _on_starttls)};
1467	}	1959	}
1468		1960
1469	sub DESTROY {	1961	sub DESTROY {
1470	my $self = shift;	1962	my ($self) = @_;
1471		1963
1472	&_freetls;	1964	&_freetls;
1473		1965
1474	my $linger = exists $self->{linger} ? $self->{linger} : 3600;	1966	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
1475		1967
1476	if ($linger && length $self->{wbuf}) {	1968	if ($linger && length $self->{wbuf} && $self->{fh}) {
1477	my $fh = delete $self->{fh};	1969	my $fh = delete $self->{fh};
1478	my $wbuf = delete $self->{wbuf};	1970	my $wbuf = delete $self->{wbuf};
1479		1971
1480	my @linger;	1972	my @linger;
1481		1973
1482	push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub {	1974	push @linger, AE::io $fh, 1, sub {
1483	my $len = syswrite $fh, $wbuf, length $wbuf;	1975	my $len = syswrite $fh, $wbuf, length $wbuf;
1484		1976
1485	if ($len > 0) {	1977	if ($len > 0) {
1486	substr $wbuf, 0, $len, "";	1978	substr $wbuf, 0, $len, "";
1487	} else {	1979	} else {
1488	@linger = (); # end	1980	@linger = (); # end
1489	}	1981	}
1490	});	1982	};
1491	push @linger, AnyEvent->timer (after => $linger, cb => sub {	1983	push @linger, AE::timer $linger, 0, sub {
1492	@linger = ();	1984	@linger = ();
1493	});	1985	};
1494	}	1986	}
1495	}	1987	}
1496		1988
1497	=item $handle->destroy	1989	=item $handle->destroy
1498		1990
1499	Shuts down the handle object as much as possible - this call ensures that	1991	Shuts down the handle object as much as possible - this call ensures that
1500	no further callbacks will be invoked and resources will be freed as much	1992	no further callbacks will be invoked and as many resources as possible
1501	as possible. You must not call any methods on the object afterwards.	1993	will be freed. Any method you will call on the handle object after
		1994	destroying it in this way will be silently ignored (and it will return the
		1995	empty list).
1502		1996
1503	Normally, you can just "forget" any references to an AnyEvent::Handle	1997	Normally, you can just "forget" any references to an AnyEvent::Handle
1504	object and it will simply shut down. This works in fatal error and EOF	1998	object and it will simply shut down. This works in fatal error and EOF
1505	callbacks, as well as code outside. It does I<NOT> work in a read or write	1999	callbacks, as well as code outside. It does I<NOT> work in a read or write
1506	callback, so when you want to destroy the AnyEvent::Handle object from	2000	callback, so when you want to destroy the AnyEvent::Handle object from
1507	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in	2001	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
1508	that case.	2002	that case.
1509		2003
		2004	Destroying the handle object in this way has the advantage that callbacks
		2005	will be removed as well, so if those are the only reference holders (as
		2006	is common), then one doesn't need to do anything special to break any
		2007	reference cycles.
		2008
1510	The handle might still linger in the background and write out remaining	2009	The handle might still linger in the background and write out remaining
1511	data, as specified by the C<linger> option, however.	2010	data, as specified by the C<linger> option, however.
1512		2011
1513	=cut	2012	=cut
1514		2013
1515	sub destroy {	2014	sub destroy {
1516	my ($self) = @_;	2015	my ($self) = @_;
1517		2016
1518	$self->DESTROY;	2017	$self->DESTROY;
1519	%$self = ();	2018	%$self = ();
		2019	bless $self, "AnyEvent::Handle::destroyed";
1520	}	2020	}
		2021
		2022	sub AnyEvent::Handle::destroyed::AUTOLOAD {
		2023	#nop
		2024	}
		2025
		2026	=item $handle->destroyed
		2027
		2028	Returns false as long as the handle hasn't been destroyed by a call to C<<
		2029	->destroy >>, true otherwise.
		2030
		2031	Can be useful to decide whether the handle is still valid after some
		2032	callback possibly destroyed the handle. For example, C<< ->push_write >>,
		2033	C<< ->starttls >> and other methods can call user callbacks, which in turn
		2034	can destroy the handle, so work can be avoided by checking sometimes:
		2035
		2036	$hdl->starttls ("accept");
		2037	return if $hdl->destroyed;
		2038	$hdl->push_write (...
		2039
		2040	Note that the call to C<push_write> will silently be ignored if the handle
		2041	has been destroyed, so often you can just ignore the possibility of the
		2042	handle being destroyed.
		2043
		2044	=cut
		2045
		2046	sub destroyed { 0 }
		2047	sub AnyEvent::Handle::destroyed::destroyed { 1 }
1521		2048
1522	=item AnyEvent::Handle::TLS_CTX	2049	=item AnyEvent::Handle::TLS_CTX
1523		2050
1524	This function creates and returns the Net::SSLeay::CTX object used by	2051	This function creates and returns the AnyEvent::TLS object used by default
1525	default for TLS mode.	2052	for TLS mode.
1526		2053
1527	The context is created like this:	2054	The context is created by calling L<AnyEvent::TLS> without any arguments.
1528
1529	Net::SSLeay::load_error_strings;
1530	Net::SSLeay::SSLeay_add_ssl_algorithms;
1531	Net::SSLeay::randomize;
1532
1533	my $CTX = Net::SSLeay::CTX_new;
1534
1535	Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL
1536		2055
1537	=cut	2056	=cut
1538		2057
1539	our $TLS_CTX;	2058	our $TLS_CTX;
1540		2059
1541	sub TLS_CTX() {	2060	sub TLS_CTX() {
1542	$TLS_CTX || do {	2061	$TLS_CTX ||= do {
1543	require Net::SSLeay;	2062	require AnyEvent::TLS;
1544		2063
1545	Net::SSLeay::load_error_strings ();	2064	new AnyEvent::TLS
1546	Net::SSLeay::SSLeay_add_ssl_algorithms ();
1547	Net::SSLeay::randomize ();
1548
1549	$TLS_CTX = Net::SSLeay::CTX_new ();
1550
1551	Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ());
1552
1553	$TLS_CTX
1554	}	2065	}
1555	}	2066	}
1556		2067
1557	=back	2068	=back
1558		2069
…		…
1597		2108
1598	$handle->on_read (sub { });	2109	$handle->on_read (sub { });
1599	$handle->on_eof (undef);	2110	$handle->on_eof (undef);
1600	$handle->on_error (sub {	2111	$handle->on_error (sub {
1601	my $data = delete $_[0]{rbuf};	2112	my $data = delete $_[0]{rbuf};
1602	undef $handle;
1603	});	2113	});
1604		2114
1605	The reason to use C<on_error> is that TCP connections, due to latencies	2115	The reason to use C<on_error> is that TCP connections, due to latencies
1606	and packets loss, might get closed quite violently with an error, when in	2116	and packets loss, might get closed quite violently with an error, when in
1607	fact, all data has been received.	2117	fact, all data has been received.
…		…
1623	$handle->on_drain (sub {	2133	$handle->on_drain (sub {
1624	warn "all data submitted to the kernel\n";	2134	warn "all data submitted to the kernel\n";
1625	undef $handle;	2135	undef $handle;
1626	});	2136	});
1627		2137
		2138	If you just want to queue some data and then signal EOF to the other side,
		2139	consider using C<< ->push_shutdown >> instead.
		2140
		2141	=item I want to contact a TLS/SSL server, I don't care about security.
		2142
		2143	If your TLS server is a pure TLS server (e.g. HTTPS) that only speaks TLS,
		2144	simply connect to it and then create the AnyEvent::Handle with the C<tls>
		2145	parameter:
		2146
		2147	tcp_connect $host, $port, sub {
		2148	my ($fh) = @_;
		2149
		2150	my $handle = new AnyEvent::Handle
		2151	fh => $fh,
		2152	tls => "connect",
		2153	on_error => sub { ... };
		2154
		2155	$handle->push_write (...);
		2156	};
		2157
		2158	=item I want to contact a TLS/SSL server, I do care about security.
		2159
		2160	Then you should additionally enable certificate verification, including
		2161	peername verification, if the protocol you use supports it (see
		2162	L<AnyEvent::TLS>, C<verify_peername>).
		2163
		2164	E.g. for HTTPS:
		2165
		2166	tcp_connect $host, $port, sub {
		2167	my ($fh) = @_;
		2168
		2169	my $handle = new AnyEvent::Handle
		2170	fh => $fh,
		2171	peername => $host,
		2172	tls => "connect",
		2173	tls_ctx => { verify => 1, verify_peername => "https" },
		2174	...
		2175
		2176	Note that you must specify the hostname you connected to (or whatever
		2177	"peername" the protocol needs) as the C<peername> argument, otherwise no
		2178	peername verification will be done.
		2179
		2180	The above will use the system-dependent default set of trusted CA
		2181	certificates. If you want to check against a specific CA, add the
		2182	C<ca_file> (or C<ca_cert>) arguments to C<tls_ctx>:
		2183
		2184	tls_ctx => {
		2185	verify => 1,
		2186	verify_peername => "https",
		2187	ca_file => "my-ca-cert.pem",
		2188	},
		2189
		2190	=item I want to create a TLS/SSL server, how do I do that?
		2191
		2192	Well, you first need to get a server certificate and key. You have
		2193	three options: a) ask a CA (buy one, use cacert.org etc.) b) create a
		2194	self-signed certificate (cheap. check the search engine of your choice,
		2195	there are many tutorials on the net) or c) make your own CA (tinyca2 is a
		2196	nice program for that purpose).
		2197
		2198	Then create a file with your private key (in PEM format, see
		2199	L<AnyEvent::TLS>), followed by the certificate (also in PEM format). The
		2200	file should then look like this:
		2201
		2202	-----BEGIN RSA PRIVATE KEY-----
		2203	...header data
		2204	... lots of base64'y-stuff
		2205	-----END RSA PRIVATE KEY-----
		2206
		2207	-----BEGIN CERTIFICATE-----
		2208	... lots of base64'y-stuff
		2209	-----END CERTIFICATE-----
		2210
		2211	The important bits are the "PRIVATE KEY" and "CERTIFICATE" parts. Then
		2212	specify this file as C<cert_file>:
		2213
		2214	tcp_server undef, $port, sub {
		2215	my ($fh) = @_;
		2216
		2217	my $handle = new AnyEvent::Handle
		2218	fh => $fh,
		2219	tls => "accept",
		2220	tls_ctx => { cert_file => "my-server-keycert.pem" },
		2221	...
		2222
		2223	When you have intermediate CA certificates that your clients might not
		2224	know about, just append them to the C<cert_file>.
		2225
1628	=back	2226	=back
1629		2227
1630		2228
1631	=head1 SUBCLASSING AnyEvent::Handle	2229	=head1 SUBCLASSING AnyEvent::Handle
1632		2230

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