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Revision 1.95 by root, Thu Oct 2 06:42:39 2008 UTC vs.
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 = 4.3;
20		4
21	=head1 SYNOPSIS	5	=head1 SYNOPSIS
22		6
23	use AnyEvent;	7	use AnyEvent;
24	use AnyEvent::Handle;	8	use AnyEvent::Handle;
25		9
26	my $cv = AnyEvent->condvar;	10	my $cv = AnyEvent->condvar;
27		11
28	my $handle =	12	my $hdl; $hdl = new AnyEvent::Handle
29	AnyEvent::Handle->new (
30	fh => \*STDIN,	13	fh => \*STDIN,
31	on_eof => sub {	14	on_error => sub {
32	$cv->broadcast;	15	my ($hdl, $fatal, $msg) = @_;
33	},	16	warn "got error $msg\n";
		17	$hdl->destroy;
		18	$cv->send;
34	);	19	};
35		20
36	# send some request line	21	# send some request line
37	$handle->push_write ("getinfo\015\012");	22	$hdl->push_write ("getinfo\015\012");
38		23
39	# read the response line	24	# read the response line
40	$handle->push_read (line => sub {	25	$hdl->push_read (line => sub {
41	my ($handle, $line) = @_;	26	my ($hdl, $line) = @_;
42	warn "read line <$line>\n";	27	warn "got line <$line>\n";
43	$cv->send;	28	$cv->send;
44	});	29	});
45		30
46	$cv->recv;	31	$cv->recv;
47		32
48	=head1 DESCRIPTION	33	=head1 DESCRIPTION
49		34
50	This module is a helper module to make it easier to do event-based I/O on	35	This module is a helper module to make it easier to do event-based I/O on
51	filehandles. For utility functions for doing non-blocking connects and accepts	36	filehandles.
52	on sockets see L<AnyEvent::Util>.
53		37
54	The L<AnyEvent::Intro> tutorial contains some well-documented	38	The L<AnyEvent::Intro> tutorial contains some well-documented
55	AnyEvent::Handle examples.	39	AnyEvent::Handle examples.
56		40
57	In the following, when the documentation refers to of "bytes" then this	41	In the following, when the documentation refers to of "bytes" then this
58	means characters. As sysread and syswrite are used for all I/O, their	42	means characters. As sysread and syswrite are used for all I/O, their
59	treatment of characters applies to this module as well.	43	treatment of characters applies to this module as well.
60		44
		45	At the very minimum, you should specify C<fh> or C<connect>, and the
		46	C<on_error> callback.
		47
61	All callbacks will be invoked with the handle object as their first	48	All callbacks will be invoked with the handle object as their first
62	argument.	49	argument.
63		50
64	=head2 SIGPIPE is not handled by this module	51	=cut
65		52
66	SIGPIPE is not handled by this module, so one of the practical	53	package AnyEvent::Handle;
67	requirements of using it is to ignore SIGPIPE (C<$SIG{PIPE} =	54
68	'IGNORE'>). At least, this is highly recommend in a networked program: If	55	use Scalar::Util ();
69	you use AnyEvent::Handle in a filter program (like sort), exiting on	56	use List::Util ();
70	SIGPIPE is probably the right thing to do.	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	}
71		79
72	=head1 METHODS	80	=head1 METHODS
73		81
74	=over 4	82	=over 4
75		83
76	=item B<new (%args)>	84	=item $handle = B<new> AnyEvent::Handle fh => $filehandle, key => value...
77		85
78	The constructor supports these arguments (all as key => value pairs).	86	The constructor supports these arguments (all as C<< key => value >> pairs).
79		87
80	=over 4	88	=over 4
81		89
82	=item fh => $filehandle [MANDATORY]	90	=item fh => $filehandle [C<fh> or C<connect> MANDATORY]
83		91
84	The filehandle this L<AnyEvent::Handle> object will operate on.	92	The filehandle this L<AnyEvent::Handle> object will operate on.
85
86	NOTE: The filehandle will be set to non-blocking mode (using	93	NOTE: The filehandle will be set to non-blocking mode (using
87	C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in	94	C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in
88	that mode.	95	that mode.
89		96
		97	=item connect => [$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
90	=item on_eof => $cb->($handle)	114	=item on_prepare => $cb->($handle)
91		115
92	Set the callback to be called when an end-of-file condition is detected,	116	This (rarely used) callback is called before a new connection is
93	i.e. in the case of a socket, when the other side has closed the	117	attempted, but after the file handle has been created. It could be used to
94	connection cleanly.	118	prepare the file handle with parameters required for the actual connect
		119	(as opposed to settings that can be changed when the connection is already
		120	established).
95		121
96	For sockets, this just means that the other side has stopped sending data,	122	The return value of this callback should be the connect timeout value in
97	you can still try to write data, and, in fact, one can return from the eof	123	seconds (or C<0>, or C<undef>, or the empty list, to indicate the default
98	callback and continue writing data, as only the read part has been shut	124	timeout is to be used).
99	down.
100		125
101	While not mandatory, it is I<highly> recommended to set an eof callback,	126	=item on_connect => $cb->($handle, $host, $port, $retry->())
102	otherwise you might end up with a closed socket while you are still
103	waiting for data.
104		127
105	If an EOF condition has been detected but no C<on_eof> callback has been	128	This callback is called when a connection has been successfully established.
106	set, then a fatal error will be raised with C<$!> set to <0>.
107		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
108	=item on_error => $cb->($handle, $fatal)	153	=item on_error => $cb->($handle, $fatal, $message)
109		154
110	This is the error callback, which is called when, well, some error	155	This is the error callback, which is called when, well, some error
111	occured, such as not being able to resolve the hostname, failure to	156	occured, such as not being able to resolve the hostname, failure to
112	connect or a read error.	157	connect or a read error.
113		158
114	Some errors are fatal (which is indicated by C<$fatal> being true). On	159	Some errors are fatal (which is indicated by C<$fatal> being true). On
115	fatal errors the handle object will be shut down and will not be usable	160	fatal errors the handle object will be destroyed (by a call to C<< ->
116	(but you are free to look at the current C<< ->rbuf >>). Examples of fatal	161	destroy >>) after invoking the error callback (which means you are free to
117	errors are an EOF condition with active (but unsatisifable) read watchers	162	examine the handle object). Examples of fatal errors are an EOF condition
118	(C<EPIPE>) or I/O errors.	163	with active (but unsatisifable) read watchers (C<EPIPE>) or I/O errors. In
		164	cases where the other side can close the connection at their will it is
		165	often easiest to not report C<EPIPE> errors in this callback.
		166
		167	AnyEvent::Handle tries to find an appropriate error code for you to check
		168	against, but in some cases (TLS errors), this does not work well. It is
		169	recommended to always output the C<$message> argument in human-readable
		170	error messages (it's usually the same as C<"$!">).
119		171
120	Non-fatal errors can be retried by simply returning, but it is recommended	172	Non-fatal errors can be retried by simply returning, but it is recommended
121	to simply ignore this parameter and instead abondon the handle object	173	to simply ignore this parameter and instead abondon the handle object
122	when this callback is invoked. Examples of non-fatal errors are timeouts	174	when this callback is invoked. Examples of non-fatal errors are timeouts
123	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).	175	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
124		176
125	On callback entrance, the value of C<$!> contains the operating system	177	On callback entrance, the value of C<$!> contains the operating system
126	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).	178	error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or
		179	C<EPROTO>).
127		180
128	While not mandatory, it is I<highly> recommended to set this callback, as	181	While not mandatory, it is I<highly> recommended to set this callback, as
129	you will not be notified of errors otherwise. The default simply calls	182	you will not be notified of errors otherwise. The default simply calls
130	C<croak>.	183	C<croak>.
131		184
…		…
135	and no read request is in the queue (unlike read queue callbacks, this	188	and no read request is in the queue (unlike read queue callbacks, this
136	callback will only be called when at least one octet of data is in the	189	callback will only be called when at least one octet of data is in the
137	read buffer).	190	read buffer).
138		191
139	To access (and remove data from) the read buffer, use the C<< ->rbuf >>	192	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
140	method or access the C<$handle->{rbuf}> member directly.	193	method or access the C<< $handle->{rbuf} >> member directly. Note that you
		194	must not enlarge or modify the read buffer, you can only remove data at
		195	the beginning from it.
141		196
142	When an EOF condition is detected then AnyEvent::Handle will first try to	197	When an EOF condition is detected then AnyEvent::Handle will first try to
143	feed all the remaining data to the queued callbacks and C<on_read> before	198	feed all the remaining data to the queued callbacks and C<on_read> before
144	calling the C<on_eof> callback. If no progress can be made, then a fatal	199	calling the C<on_eof> callback. If no progress can be made, then a fatal
145	error will be raised (with C<$!> set to C<EPIPE>).	200	error will be raised (with C<$!> set to C<EPIPE>).
		201
		202	Note that, unlike requests in the read queue, an C<on_read> callback
		203	doesn't mean you I<require> some data: if there is an EOF and there
		204	are outstanding read requests then an error will be flagged. With an
		205	C<on_read> callback, the C<on_eof> callback will be invoked.
		206
		207	=item on_eof => $cb->($handle)
		208
		209	Set the callback to be called when an end-of-file condition is detected,
		210	i.e. in the case of a socket, when the other side has closed the
		211	connection cleanly, and there are no outstanding read requests in the
		212	queue (if there are read requests, then an EOF counts as an unexpected
		213	connection close and will be flagged as an error).
		214
		215	For sockets, this just means that the other side has stopped sending data,
		216	you can still try to write data, and, in fact, one can return from the EOF
		217	callback and continue writing data, as only the read part has been shut
		218	down.
		219
		220	If an EOF condition has been detected but no C<on_eof> callback has been
		221	set, then a fatal error will be raised with C<$!> set to <0>.
146		222
147	=item on_drain => $cb->($handle)	223	=item on_drain => $cb->($handle)
148		224
149	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
150	(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).
…		…
157	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
158	the file when the write queue becomes empty.	234	the file when the write queue becomes empty.
159		235
160	=item timeout => $fractional_seconds	236	=item timeout => $fractional_seconds
161		237
		238	=item rtimeout => $fractional_seconds
		239
		240	=item wtimeout => $fractional_seconds
		241
162	If non-zero, then this enables an "inactivity" timeout: whenever this many	242	If non-zero, then these enables an "inactivity" timeout: whenever this
163	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
164	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
165	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>.
166		253
167	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
168	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
169	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
170	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
…		…
214	accomplishd by setting this option to a true value.	301	accomplishd by setting this option to a true value.
215		302
216	The default is your opertaing system's default behaviour (most likely	303	The default is your opertaing system's default behaviour (most likely
217	enabled), this option explicitly enables or disables it, if possible.	304	enabled), this option explicitly enables or disables it, if possible.
218		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
219	=item read_size => <bytes>	338	=item read_size => <bytes>
220		339
221	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
222	try to read during each loop iteration, which affects memory	341	try to read during each loop iteration, which affects memory
223	requirements). Default: C<8192>.	342	requirements). Default: C<8192>.
…		…
243		362
244	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
245	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
246	help.	365	help.
247		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
248	=item tls => "accept" | "connect" | Net::SSLeay::SSL object	377	=item tls => "accept" | "connect" | Net::SSLeay::SSL object
249		378
250	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
251	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
252	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.
253		385
254	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
255	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
256	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
257	to add the dependency yourself.	389	to add the dependency yourself.
…		…
261	mode.	393	mode.
262		394
263	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
264	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>
265	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
266	AnyEvent::Handle.	398	AnyEvent::Handle. Also, this module will take ownership of this connection
		399	object.
		400
		401	At some future point, AnyEvent::Handle might switch to another TLS
		402	implementation, then the option to use your own session object will go
		403	away.
		404
		405	B<IMPORTANT:> since Net::SSLeay "objects" are really only integers,
		406	passing in the wrong integer will lead to certain crash. This most often
		407	happens when one uses a stylish C<< tls => 1 >> and is surprised about the
		408	segmentation fault.
267		409
268	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.
269		411
270	=item tls_ctx => $ssl_ctx	412	=item tls_ctx => $anyevent_tls
271		413
272	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
273	(unless a connection object was specified directly). If this parameter is	415	(unless a connection object was specified directly). If this parameter is
274	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.
275		453
276	=item json => JSON or JSON::XS object	454	=item json => JSON or JSON::XS object
277		455
278	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.
279		457
…		…
288		466
289	=cut	467	=cut
290		468
291	sub new {	469	sub new {
292	my $class = shift;	470	my $class = shift;
293
294	my $self = bless { @_ }, $class;	471	my $self = bless { @_ }, $class;
295		472
296	$self->{fh} or Carp::croak "mandatory argument fh is missing";	473	if ($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) = @_;
297		536
298	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	537	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
299		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
300	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})	552	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})
301	if $self->{tls};	553	if $self->{tls};
302		554
303	$self->{_activity} = AnyEvent->now;
304	$self->_timeout;
305
306	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};	555	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};
307	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};
308		556
309	$self->start_read	557	$self->start_read
310	if $self->{on_read};	558	if $self->{on_read} || @{ $self->{_queue} };
311		559
312	$self	560	$self->_drain_wbuf;
313	}
314
315	sub _shutdown {
316	my ($self) = @_;
317
318	delete $self->{_tw};
319	delete $self->{_rw};
320	delete $self->{_ww};
321	delete $self->{fh};
322
323	&_freetls;
324
325	delete $self->{on_read};
326	delete $self->{_queue};
327	}	561	}
328		562
329	sub _error {	563	sub _error {
330	my ($self, $errno, $fatal) = @_;	564	my ($self, $errno, $fatal, $message) = @_;
331
332	$self->_shutdown
333	if $fatal;
334		565
335	$! = $errno;	566	$! = $errno;
		567	$message ||= "$!";
336		568
337	if ($self->{on_error}) {	569	if ($self->{on_error}) {
338	$self->{on_error}($self, $fatal);	570	$self->{on_error}($self, $fatal, $message);
339	} else {	571	$self->destroy if $fatal;
		572	} elsif ($self->{fh} || $self->{connect}) {
		573	$self->destroy;
340	Carp::croak "AnyEvent::Handle uncaught error: $!";	574	Carp::croak "AnyEvent::Handle uncaught error: $message";
341	}	575	}
342	}	576	}
343		577
344	=item $fh = $handle->fh	578	=item $fh = $handle->fh
345		579
…		…
369	$_[0]{on_eof} = $_[1];	603	$_[0]{on_eof} = $_[1];
370	}	604	}
371		605
372	=item $handle->on_timeout ($cb)	606	=item $handle->on_timeout ($cb)
373		607
374	Replace the current C<on_timeout> callback, or disables the callback (but	608	=item $handle->on_rtimeout ($cb)
375	not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor
376	argument and method.
377		609
378	=cut	610	=item $handle->on_wtimeout ($cb)
379		611
380	sub on_timeout {	612	Replace the current C<on_timeout>, C<on_rtimeout> or C<on_wtimeout>
381	$_[0]{on_timeout} = $_[1];	613	callback, or disables the callback (but not the timeout) if C<$cb> =
382	}	614	C<undef>. See the C<timeout> constructor argument and method.
		615
		616	=cut
		617
		618	# see below
383		619
384	=item $handle->autocork ($boolean)	620	=item $handle->autocork ($boolean)
385		621
386	Enables or disables the current autocork behaviour (see C<autocork>	622	Enables or disables the current autocork behaviour (see C<autocork>
387	constructor argument).	623	constructor argument). Changes will only take effect on the next write.
388		624
389	=cut	625	=cut
		626
		627	sub autocork {
		628	$_[0]{autocork} = $_[1];
		629	}
390		630
391	=item $handle->no_delay ($boolean)	631	=item $handle->no_delay ($boolean)
392		632
393	Enables or disables the C<no_delay> setting (see constructor argument of	633	Enables or disables the C<no_delay> setting (see constructor argument of
394	the same name for details).	634	the same name for details).
…		…
398	sub no_delay {	638	sub no_delay {
399	$_[0]{no_delay} = $_[1];	639	$_[0]{no_delay} = $_[1];
400		640
401	eval {	641	eval {
402	local $SIG{__DIE__};	642	local $SIG{__DIE__};
403	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1];	643	setsockopt $_[0]{fh}, Socket::IPPROTO_TCP (), Socket::TCP_NODELAY (), int $_[1]
		644	if $_[0]{fh};
404	};	645	};
405	}	646	}
406		647
		648	=item $handle->keepalive ($boolean)
		649
		650	Enables or disables the C<keepalive> setting (see constructor argument of
		651	the same name for details).
		652
		653	=cut
		654
		655	sub keepalive {
		656	$_[0]{keepalive} = $_[1];
		657
		658	eval {
		659	local $SIG{__DIE__};
		660	setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_KEEPALIVE (), int $_[1]
		661	if $_[0]{fh};
		662	};
		663	}
		664
		665	=item $handle->oobinline ($boolean)
		666
		667	Enables or disables the C<oobinline> setting (see constructor argument of
		668	the same name for details).
		669
		670	=cut
		671
		672	sub oobinline {
		673	$_[0]{oobinline} = $_[1];
		674
		675	eval {
		676	local $SIG{__DIE__};
		677	setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_OOBINLINE (), int $_[1]
		678	if $_[0]{fh};
		679	};
		680	}
		681
		682	=item $handle->keepalive ($boolean)
		683
		684	Enables or disables the C<keepalive> setting (see constructor argument of
		685	the same name for details).
		686
		687	=cut
		688
		689	sub keepalive {
		690	$_[0]{keepalive} = $_[1];
		691
		692	eval {
		693	local $SIG{__DIE__};
		694	setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_KEEPALIVE (), int $_[1]
		695	if $_[0]{fh};
		696	};
		697	}
		698
		699	=item $handle->on_starttls ($cb)
		700
		701	Replace the current C<on_starttls> callback (see the C<on_starttls> constructor argument).
		702
		703	=cut
		704
		705	sub on_starttls {
		706	$_[0]{on_starttls} = $_[1];
		707	}
		708
		709	=item $handle->on_stoptls ($cb)
		710
		711	Replace the current C<on_stoptls> callback (see the C<on_stoptls> constructor argument).
		712
		713	=cut
		714
		715	sub on_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
407	#############################################################################	729	#############################################################################
408		730
409	=item $handle->timeout ($seconds)	731	=item $handle->timeout ($seconds)
410		732
		733	=item $handle->rtimeout ($seconds)
		734
		735	=item $handle->wtimeout ($seconds)
		736
411	Configures (or disables) the inactivity timeout.	737	Configures (or disables) the inactivity timeout.
412		738
413	=cut	739	=item $handle->timeout_reset
414		740
415	sub timeout {	741	=item $handle->rtimeout_reset
		742
		743	=item $handle->wtimeout_reset
		744
		745	Reset the activity timeout, as if data was received or sent.
		746
		747	These methods are cheap to call.
		748
		749	=cut
		750
		751	for my $dir ("", "r", "w") {
		752	my $timeout = "${dir}timeout";
		753	my $tw = "_${dir}tw";
		754	my $on_timeout = "on_${dir}timeout";
		755	my $activity = "_${dir}activity";
		756	my $cb;
		757
		758	*$on_timeout = sub {
		759	$_[0]{$on_timeout} = $_[1];
		760	};
		761
		762	*$timeout = sub {
416	my ($self, $timeout) = @_;	763	my ($self, $new_value) = @_;
417		764
418	$self->{timeout} = $timeout;	765	$self->{$timeout} = $new_value;
419	$self->_timeout;	766	delete $self->{$tw}; &$cb;
420	}	767	};
421		768
		769	*{"${dir}timeout_reset"} = sub {
		770	$_[0]{$activity} = AE::now;
		771	};
		772
		773	# main workhorse:
422	# reset the timeout watcher, as neccessary	774	# reset the timeout watcher, as neccessary
423	# also check for time-outs	775	# also check for time-outs
424	sub _timeout {	776	$cb = sub {
425	my ($self) = @_;	777	my ($self) = @_;
426		778
427	if ($self->{timeout}) {	779	if ($self->{$timeout} && $self->{fh}) {
428	my $NOW = AnyEvent->now;	780	my $NOW = AE::now;
429		781
430	# when would the timeout trigger?	782	# when would the timeout trigger?
431	my $after = $self->{_activity} + $self->{timeout} - $NOW;	783	my $after = $self->{$activity} + $self->{$timeout} - $NOW;
432		784
433	# now or in the past already?	785	# now or in the past already?
434	if ($after <= 0) {	786	if ($after <= 0) {
435	$self->{_activity} = $NOW;	787	$self->{$activity} = $NOW;
436		788
437	if ($self->{on_timeout}) {	789	if ($self->{$on_timeout}) {
438	$self->{on_timeout}($self);	790	$self->{$on_timeout}($self);
439	} else {	791	} else {
440	$self->_error (&Errno::ETIMEDOUT);	792	$self->_error (Errno::ETIMEDOUT);
		793	}
		794
		795	# callback could have changed timeout value, optimise
		796	return unless $self->{$timeout};
		797
		798	# calculate new after
		799	$after = $self->{$timeout};
441	}	800	}
442		801
443	# callback could have changed timeout value, optimise	802	Scalar::Util::weaken $self;
444	return unless $self->{timeout};	803	return unless $self; # ->error could have destroyed $self
445		804
446	# calculate new after	805	$self->{$tw} ||= AE::timer $after, 0, sub {
447	$after = $self->{timeout};	806	delete $self->{$tw};
		807	$cb->($self);
		808	};
		809	} else {
		810	delete $self->{$tw};
448	}	811	}
449
450	Scalar::Util::weaken $self;
451	return unless $self; # ->error could have destroyed $self
452
453	$self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub {
454	delete $self->{_tw};
455	$self->_timeout;
456	});
457	} else {
458	delete $self->{_tw};
459	}	812	}
460	}	813	}
461		814
462	#############################################################################	815	#############################################################################
463		816
…		…
508	Scalar::Util::weaken $self;	861	Scalar::Util::weaken $self;
509		862
510	my $cb = sub {	863	my $cb = sub {
511	my $len = syswrite $self->{fh}, $self->{wbuf};	864	my $len = syswrite $self->{fh}, $self->{wbuf};
512		865
513	if ($len >= 0) {	866	if (defined $len) {
514	substr $self->{wbuf}, 0, $len, "";	867	substr $self->{wbuf}, 0, $len, "";
515		868
516	$self->{_activity} = AnyEvent->now;	869	$self->{_activity} = $self->{_wactivity} = AE::now;
517		870
518	$self->{on_drain}($self)	871	$self->{on_drain}($self)
519	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})	872	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
520	&& $self->{on_drain};	873	&& $self->{on_drain};
521		874
…		…
527		880
528	# try to write data immediately	881	# try to write data immediately
529	$cb->() unless $self->{autocork};	882	$cb->() unless $self->{autocork};
530		883
531	# if still data left in wbuf, we need to poll	884	# if still data left in wbuf, we need to poll
532	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)	885	$self->{_ww} = AE::io $self->{fh}, 1, $cb
533	if length $self->{wbuf};	886	if length $self->{wbuf};
534	};	887	};
535	}	888	}
536		889
537	our %WH;	890	our %WH;
538		891
		892	# deprecated
539	sub register_write_type($$) {	893	sub register_write_type($$) {
540	$WH{$_[0]} = $_[1];	894	$WH{$_[0]} = $_[1];
541	}	895	}
542		896
543	sub push_write {	897	sub push_write {
544	my $self = shift;	898	my $self = shift;
545		899
546	if (@_ > 1) {	900	if (@_ > 1) {
547	my $type = shift;	901	my $type = shift;
548		902
		903	@_ = ($WH{$type} ||= _load_func "$type\::anyevent_write_type"
549	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")	904	or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::push_write")
550	->($self, @_);	905	->($self, @_);
551	}	906	}
552		907
		908	# we downgrade here to avoid hard-to-track-down bugs,
		909	# and diagnose the problem earlier and better.
		910
553	if ($self->{tls}) {	911	if ($self->{tls}) {
554	$self->{_tls_wbuf} .= $_[0];	912	utf8::downgrade $self->{_tls_wbuf} .= $_[0];
555	&_dotls ($self);	913	&_dotls ($self) if $self->{fh};
556	} else {	914	} else {
557	$self->{wbuf} .= $_[0];	915	utf8::downgrade $self->{wbuf} .= $_[0];
558	$self->_drain_wbuf;	916	$self->_drain_wbuf if $self->{fh};
559	}	917	}
560	}	918	}
561		919
562	=item $handle->push_write (type => @args)	920	=item $handle->push_write (type => @args)
563		921
564	Instead of formatting your data yourself, you can also let this module do	922	Instead of formatting your data yourself, you can also let this module
565	the job by specifying a type and type-specific arguments.	923	do the job by specifying a type and type-specific arguments. You
		924	can also specify the (fully qualified) name of a package, in which
		925	case AnyEvent tries to load the package and then expects to find the
		926	C<anyevent_read_type> function inside (see "custom write types", below).
566		927
567	Predefined types are (if you have ideas for additional types, feel free to	928	Predefined types are (if you have ideas for additional types, feel free to
568	drop by and tell us):	929	drop by and tell us):
569		930
570	=over 4	931	=over 4
…		…
577	=cut	938	=cut
578		939
579	register_write_type netstring => sub {	940	register_write_type netstring => sub {
580	my ($self, $string) = @_;	941	my ($self, $string) = @_;
581		942
582	sprintf "%d:%s,", (length $string), $string	943	(length $string) . ":$string,"
583	};	944	};
584		945
585	=item packstring => $format, $data	946	=item packstring => $format, $data
586		947
587	An octet string prefixed with an encoded length. The encoding C<$format>	948	An octet string prefixed with an encoded length. The encoding C<$format>
…		…
627	Other languages could read single lines terminated by a newline and pass	988	Other languages could read single lines terminated by a newline and pass
628	this line into their JSON decoder of choice.	989	this line into their JSON decoder of choice.
629		990
630	=cut	991	=cut
631		992
		993	sub json_coder() {
		994	eval { require JSON::XS; JSON::XS->new->utf8 }
		995	|| do { require JSON; JSON->new->utf8 }
		996	}
		997
632	register_write_type json => sub {	998	register_write_type json => sub {
633	my ($self, $ref) = @_;	999	my ($self, $ref) = @_;
634		1000
635	require JSON;	1001	my $json = $self->{json} ||= json_coder;
636		1002
637	$self->{json} ? $self->{json}->encode ($ref)	1003	$json->encode ($ref)
638	: JSON::encode_json ($ref)
639	};	1004	};
640		1005
641	=item storable => $reference	1006	=item storable => $reference
642		1007
643	Freezes the given reference using L<Storable> and writes it to the	1008	Freezes the given reference using L<Storable> and writes it to the
…		…
653	pack "w/a*", Storable::nfreeze ($ref)	1018	pack "w/a*", Storable::nfreeze ($ref)
654	};	1019	};
655		1020
656	=back	1021	=back
657		1022
658	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)	1023	=item $handle->push_shutdown
659		1024
660	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
661	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
662	reference with the handle object and the remaining arguments.	1057	the handle object and the remaining arguments.
663		1058
664	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
665	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.
666		1062
667	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
668	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 $delim, @args
		1078	}
669		1079
670	=cut	1080	=cut
671		1081
672	#############################################################################	1082	#############################################################################
673		1083
…		…
755	=cut	1165	=cut
756		1166
757	sub _drain_rbuf {	1167	sub _drain_rbuf {
758	my ($self) = @_;	1168	my ($self) = @_;
759		1169
		1170	# avoid recursion
		1171	return if $self->{_skip_drain_rbuf};
760	local $self->{_in_drain} = 1;	1172	local $self->{_skip_drain_rbuf} = 1;
761
762	if (
763	defined $self->{rbuf_max}
764	&& $self->{rbuf_max} < length $self->{rbuf}
765	) {
766	$self->_error (&Errno::ENOSPC, 1), return;
767	}
768		1173
769	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
770	my $len = length $self->{rbuf};	1180	my $len = length $self->{rbuf};
771		1181
772	if (my $cb = shift @{ $self->{_queue} }) {	1182	if (my $cb = shift @{ $self->{_queue} }) {
773	unless ($cb->($self)) {	1183	unless ($cb->($self)) {
774	if ($self->{_eof}) {	1184	# no progress can be made
775	# no progress can be made (not enough data and no data forthcoming)	1185	# (not enough data and no data forthcoming)
776	$self->_error (&Errno::EPIPE, 1), return;	1186	$self->_error (Errno::EPIPE, 1), return
777	}	1187	if $self->{_eof};
778		1188
779	unshift @{ $self->{_queue} }, $cb;	1189	unshift @{ $self->{_queue} }, $cb;
780	last;	1190	last;
781	}	1191	}
782	} elsif ($self->{on_read}) {	1192	} elsif ($self->{on_read}) {
…		…
789	&& !@{ $self->{_queue} } # and the queue is still empty	1199	&& !@{ $self->{_queue} } # and the queue is still empty
790	&& $self->{on_read} # but we still have on_read	1200	&& $self->{on_read} # but we still have on_read
791	) {	1201	) {
792	# no further data will arrive	1202	# no further data will arrive
793	# so no progress can be made	1203	# so no progress can be made
794	$self->_error (&Errno::EPIPE, 1), return	1204	$self->_error (Errno::EPIPE, 1), return
795	if $self->{_eof};	1205	if $self->{_eof};
796		1206
797	last; # more data might arrive	1207	last; # more data might arrive
798	}	1208	}
799	} else {	1209	} else {
…		…
802	last;	1212	last;
803	}	1213	}
804	}	1214	}
805		1215
806	if ($self->{_eof}) {	1216	if ($self->{_eof}) {
807	if ($self->{on_eof}) {	1217	$self->{on_eof}
808	$self->{on_eof}($self)	1218	? $self->{on_eof}($self)
809	} else {	1219	: $self->_error (0, 1, "Unexpected end-of-file");
810	$self->_error (0, 1);	1220
811	}	1221	return;
		1222	}
		1223
		1224	if (
		1225	defined $self->{rbuf_max}
		1226	&& $self->{rbuf_max} < length $self->{rbuf}
		1227	) {
		1228	$self->_error (Errno::ENOSPC, 1), return;
812	}	1229	}
813		1230
814	# may need to restart read watcher	1231	# may need to restart read watcher
815	unless ($self->{_rw}) {	1232	unless ($self->{_rw}) {
816	$self->start_read	1233	$self->start_read
…		…
828		1245
829	sub on_read {	1246	sub on_read {
830	my ($self, $cb) = @_;	1247	my ($self, $cb) = @_;
831		1248
832	$self->{on_read} = $cb;	1249	$self->{on_read} = $cb;
833	$self->_drain_rbuf if $cb && !$self->{_in_drain};	1250	$self->_drain_rbuf if $cb;
834	}	1251	}
835		1252
836	=item $handle->rbuf	1253	=item $handle->rbuf
837		1254
838	Returns the read buffer (as a modifiable lvalue).	1255	Returns the read buffer (as a modifiable lvalue).
839		1256
840	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} >>
841	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.
842		1262
843	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>,
844	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
845	automatically manage the read buffer.	1265	automatically manage the read buffer.
846		1266
…		…
882	my $cb = pop;	1302	my $cb = pop;
883		1303
884	if (@_) {	1304	if (@_) {
885	my $type = shift;	1305	my $type = shift;
886		1306
		1307	$cb = ($RH{$type} ||= _load_func "$type\::anyevent_read_type"
887	$cb = ($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")
888	->($self, $cb, @_);	1309	->($self, $cb, @_);
889	}	1310	}
890		1311
891	push @{ $self->{_queue} }, $cb;	1312	push @{ $self->{_queue} }, $cb;
892	$self->_drain_rbuf unless $self->{_in_drain};	1313	$self->_drain_rbuf;
893	}	1314	}
894		1315
895	sub unshift_read {	1316	sub unshift_read {
896	my $self = shift;	1317	my $self = shift;
897	my $cb = pop;	1318	my $cb = pop;
…		…
901		1322
902	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read")	1323	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read")
903	->($self, $cb, @_);	1324	->($self, $cb, @_);
904	}	1325	}
905		1326
906
907	unshift @{ $self->{_queue} }, $cb;	1327	unshift @{ $self->{_queue} }, $cb;
908	$self->_drain_rbuf unless $self->{_in_drain};	1328	$self->_drain_rbuf;
909	}	1329	}
910		1330
911	=item $handle->push_read (type => @args, $cb)	1331	=item $handle->push_read (type => @args, $cb)
912		1332
913	=item $handle->unshift_read (type => @args, $cb)	1333	=item $handle->unshift_read (type => @args, $cb)
914		1334
915	Instead of providing a callback that parses the data itself you can chose	1335	Instead of providing a callback that parses the data itself you can chose
916	between a number of predefined parsing formats, for chunks of data, lines	1336	between a number of predefined parsing formats, for chunks of data, lines
917	etc.	1337	etc. You can also specify the (fully qualified) name of a package, in
		1338	which case AnyEvent tries to load the package and then expects to find the
		1339	C<anyevent_read_type> function inside (see "custom read types", below).
918		1340
919	Predefined types are (if you have ideas for additional types, feel free to	1341	Predefined types are (if you have ideas for additional types, feel free to
920	drop by and tell us):	1342	drop by and tell us):
921		1343
922	=over 4	1344	=over 4
…		…
1046	return 1;	1468	return 1;
1047	}	1469	}
1048		1470
1049	# reject	1471	# reject
1050	if ($reject && $$rbuf =~ $reject) {	1472	if ($reject && $$rbuf =~ $reject) {
1051	$self->_error (&Errno::EBADMSG);	1473	$self->_error (Errno::EBADMSG);
1052	}	1474	}
1053		1475
1054	# skip	1476	# skip
1055	if ($skip && $$rbuf =~ $skip) {	1477	if ($skip && $$rbuf =~ $skip) {
1056	$data .= substr $$rbuf, 0, $+[0], "";	1478	$data .= substr $$rbuf, 0, $+[0], "";
…		…
1072	my ($self, $cb) = @_;	1494	my ($self, $cb) = @_;
1073		1495
1074	sub {	1496	sub {
1075	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {	1497	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {
1076	if ($_[0]{rbuf} =~ /[^0-9]/) {	1498	if ($_[0]{rbuf} =~ /[^0-9]/) {
1077	$self->_error (&Errno::EBADMSG);	1499	$self->_error (Errno::EBADMSG);
1078	}	1500	}
1079	return;	1501	return;
1080	}	1502	}
1081		1503
1082	my $len = $1;	1504	my $len = $1;
…		…
1085	my $string = $_[1];	1507	my $string = $_[1];
1086	$_[0]->unshift_read (chunk => 1, sub {	1508	$_[0]->unshift_read (chunk => 1, sub {
1087	if ($_[1] eq ",") {	1509	if ($_[1] eq ",") {
1088	$cb->($_[0], $string);	1510	$cb->($_[0], $string);
1089	} else {	1511	} else {
1090	$self->_error (&Errno::EBADMSG);	1512	$self->_error (Errno::EBADMSG);
1091	}	1513	}
1092	});	1514	});
1093	});	1515	});
1094		1516
1095	1	1517	1
…		…
1101	An octet string prefixed with an encoded length. The encoding C<$format>	1523	An octet string prefixed with an encoded length. The encoding C<$format>
1102	uses the same format as a Perl C<pack> format, but must specify a single	1524	uses the same format as a Perl C<pack> format, but must specify a single
1103	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an	1525	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
1104	optional C<!>, C<< < >> or C<< > >> modifier).	1526	optional C<!>, C<< < >> or C<< > >> modifier).
1105		1527
1106	DNS over TCP uses a prefix of C<n>, EPP uses a prefix of C<N>.	1528	For example, DNS over TCP uses a prefix of C<n> (2 octet network order),
		1529	EPP uses a prefix of C<N> (4 octtes).
1107		1530
1108	Example: read a block of data prefixed by its length in BER-encoded	1531	Example: read a block of data prefixed by its length in BER-encoded
1109	format (very efficient).	1532	format (very efficient).
1110		1533
1111	$handle->push_read (packstring => "w", sub {	1534	$handle->push_read (packstring => "w", sub {
…		…
1141	}	1564	}
1142	};	1565	};
1143		1566
1144	=item json => $cb->($handle, $hash_or_arrayref)	1567	=item json => $cb->($handle, $hash_or_arrayref)
1145		1568
1146	Reads a JSON object or array, decodes it and passes it to the callback.	1569	Reads a JSON object or array, decodes it and passes it to the
		1570	callback. When a parse error occurs, an C<EBADMSG> error will be raised.
1147		1571
1148	If a C<json> object was passed to the constructor, then that will be used	1572	If a C<json> object was passed to the constructor, then that will be used
1149	for the final decode, otherwise it will create a JSON coder expecting UTF-8.	1573	for the final decode, otherwise it will create a JSON coder expecting UTF-8.
1150		1574
1151	This read type uses the incremental parser available with JSON version	1575	This read type uses the incremental parser available with JSON version
…		…
1160	=cut	1584	=cut
1161		1585
1162	register_read_type json => sub {	1586	register_read_type json => sub {
1163	my ($self, $cb) = @_;	1587	my ($self, $cb) = @_;
1164		1588
1165	require JSON;	1589	my $json = $self->{json} ||= json_coder;
1166		1590
1167	my $data;	1591	my $data;
1168	my $rbuf = \$self->{rbuf};	1592	my $rbuf = \$self->{rbuf};
1169		1593
1170	my $json = $self->{json} ||= JSON->new->utf8;
1171
1172	sub {	1594	sub {
1173	my $ref = $json->incr_parse ($self->{rbuf});	1595	my $ref = eval { $json->incr_parse ($self->{rbuf}) };
1174		1596
1175	if ($ref) {	1597	if ($ref) {
1176	$self->{rbuf} = $json->incr_text;	1598	$self->{rbuf} = $json->incr_text;
1177	$json->incr_text = "";	1599	$json->incr_text = "";
1178	$cb->($self, $ref);	1600	$cb->($self, $ref);
1179		1601
1180	1	1602	1
		1603	} elsif ($@) {
		1604	# error case
		1605	$json->incr_skip;
		1606
		1607	$self->{rbuf} = $json->incr_text;
		1608	$json->incr_text = "";
		1609
		1610	$self->_error (Errno::EBADMSG);
		1611
		1612	()
1181	} else {	1613	} else {
1182	$self->{rbuf} = "";	1614	$self->{rbuf} = "";
		1615
1183	()	1616	()
1184	}	1617	}
1185	}	1618	}
1186	};	1619	};
1187		1620
…		…
1219	# read remaining chunk	1652	# read remaining chunk
1220	$_[0]->unshift_read (chunk => $len, sub {	1653	$_[0]->unshift_read (chunk => $len, sub {
1221	if (my $ref = eval { Storable::thaw ($_[1]) }) {	1654	if (my $ref = eval { Storable::thaw ($_[1]) }) {
1222	$cb->($_[0], $ref);	1655	$cb->($_[0], $ref);
1223	} else {	1656	} else {
1224	$self->_error (&Errno::EBADMSG);	1657	$self->_error (Errno::EBADMSG);
1225	}	1658	}
1226	});	1659	});
1227	}	1660	}
1228		1661
1229	1	1662	1
1230	}	1663	}
1231	};	1664	};
1232		1665
1233	=back	1666	=back
1234		1667
1235	=item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args)	1668	=item custom read types - Package::anyevent_read_type $handle, $cb, @args
1236		1669
1237	This function (not method) lets you add your own types to C<push_read>.	1670	Instead of one of the predefined types, you can also specify the name
		1671	of a package. AnyEvent will try to load the package and then expects to
		1672	find a function named C<anyevent_read_type> inside. If it isn't found, it
		1673	progressively tries to load the parent package until it either finds the
		1674	function (good) or runs out of packages (bad).
1238		1675
1239	Whenever the given C<type> is used, C<push_read> will invoke the code	1676	Whenever this type is used, C<push_read> will invoke the function with the
1240	reference with the handle object, the callback and the remaining	1677	handle object, the original callback and the remaining arguments.
1241	arguments.
1242		1678
1243	The code reference is supposed to return a callback (usually a closure)	1679	The function is supposed to return a callback (usually a closure) that
1244	that works as a plain read callback (see C<< ->push_read ($cb) >>).	1680	works as a plain read callback (see C<< ->push_read ($cb) >>), so you can
		1681	mentally treat the function as a "configurable read type to read callback"
		1682	converter.
1245		1683
1246	It should invoke the passed callback when it is done reading (remember to	1684	It should invoke the original callback when it is done reading (remember
1247	pass C<$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).
1248		1687
1249	Note that this is a function, and all types registered this way will be
1250	global, so try to use unique names.
1251
1252	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
1253	search for C<register_read_type>)).	1689	AnyEvent::Handle>, search for C<register_read_type>)).
1254		1690
1255	=item $handle->stop_read	1691	=item $handle->stop_read
1256		1692
1257	=item $handle->start_read	1693	=item $handle->start_read
1258		1694
…		…
1278	}	1714	}
1279		1715
1280	sub start_read {	1716	sub start_read {
1281	my ($self) = @_;	1717	my ($self) = @_;
1282		1718
1283	unless ($self->{_rw} || $self->{_eof}) {	1719	unless ($self->{_rw} || $self->{_eof} || !$self->{fh}) {
1284	Scalar::Util::weaken $self;	1720	Scalar::Util::weaken $self;
1285		1721
1286	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1722	$self->{_rw} = AE::io $self->{fh}, 0, sub {
1287	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});	1723	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1288	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;
1289		1725
1290	if ($len > 0) {	1726	if ($len > 0) {
1291	$self->{_activity} = AnyEvent->now;	1727	$self->{_activity} = $self->{_ractivity} = AE::now;
1292		1728
1293	if ($self->{tls}) {	1729	if ($self->{tls}) {
1294	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);	1730	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
		1731
1295	&_dotls ($self);	1732	&_dotls ($self);
1296	} else {	1733	} else {
1297	$self->_drain_rbuf unless $self->{_in_drain};	1734	$self->_drain_rbuf;
1298	}	1735	}
1299		1736
1300	} elsif (defined $len) {	1737	} elsif (defined $len) {
1301	delete $self->{_rw};	1738	delete $self->{_rw};
1302	$self->{_eof} = 1;	1739	$self->{_eof} = 1;
1303	$self->_drain_rbuf unless $self->{_in_drain};	1740	$self->_drain_rbuf;
1304		1741
1305	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	1742	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
1306	return $self->_error ($!, 1);	1743	return $self->_error ($!, 1);
1307	}	1744	}
1308	});	1745	};
1309	}	1746	}
1310	}	1747	}
1311		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, $err);
		1769	}
		1770	}
		1771
		1772	# poll the write BIO and send the data if applicable
		1773	# also decode read data if possible
		1774	# this is basiclaly our TLS state machine
		1775	# more efficient implementations are possible with openssl,
		1776	# but not with the buggy and incomplete Net::SSLeay.
1312	sub _dotls {	1777	sub _dotls {
1313	my ($self) = @_;	1778	my ($self) = @_;
1314		1779
1315	my $buf;	1780	my $tmp;
1316		1781
1317	if (length $self->{_tls_wbuf}) {	1782	if (length $self->{_tls_wbuf}) {
1318	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1783	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1319	substr $self->{_tls_wbuf}, 0, $len, "";	1784	substr $self->{_tls_wbuf}, 0, $tmp, "";
1320	}	1785	}
1321	}
1322		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 || $!);
		1791	}
		1792
1323	while (defined ($buf = Net::SSLeay::read ($self->{tls}))) {	1793	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
1324	unless (length $buf) {	1794	unless (length $tmp) {
1325	# let's treat SSL-eof as we treat normal EOF	1795	$self->{_on_starttls}
1326	delete $self->{_rw};	1796	and (delete $self->{_on_starttls})->($self, undef, "EOF during handshake"); # ???
1327	$self->{_eof} = 1;
1328	&_freetls;	1797	&_freetls;
		1798
		1799	if ($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	}
1329	}	1807	}
1330		1808
1331	$self->{rbuf} .= $buf;	1809	$self->{_tls_rbuf} .= $tmp;
1332	$self->_drain_rbuf unless $self->{_in_drain};	1810	$self->_drain_rbuf;
1333	$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
1334	}	1812	}
1335		1813
1336	my $err = Net::SSLeay::get_error ($self->{tls}, -1);	1814	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
1337
1338	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {
1339	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {
1340	return $self->_error ($!, 1);	1815	return $self->_tls_error ($tmp)
1341	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {	1816	if $tmp != $ERROR_WANT_READ
1342	return $self->_error (&Errno::EIO, 1);	1817	&& ($tmp != $ERROR_SYSCALL || $!);
1343	}
1344		1818
1345	# all others are fine for our purposes
1346	}
1347
1348	if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {	1819	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1349	$self->{wbuf} .= $buf;	1820	$self->{wbuf} .= $tmp;
1350	$self->_drain_wbuf;	1821	$self->_drain_wbuf;
		1822	$self->{tls} or return; # tls session might have gone away in callback
1351	}	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");
1352	}	1828	}
1353		1829
1354	=item $handle->starttls ($tls[, $tls_ctx])	1830	=item $handle->starttls ($tls[, $tls_ctx])
1355		1831
1356	Instead of starting TLS negotiation immediately when the AnyEvent::Handle	1832	Instead of starting TLS negotiation immediately when the AnyEvent::Handle
1357	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
1358	C<starttls>.	1834	C<starttls>.
1359		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
1360	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
1361	C<"connect">, C<"accept"> or an existing Net::SSLeay object).	1841	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
1362		1842
1363	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
1364	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.
1365		1847
1366	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
1367	call and can be used or changed to your liking. Note that the handshake	1849	context in C<< $handle->{tls_ctx} >> after this call and can be used or
1368	might have already started when this function returns.	1850	changed to your liking. Note that the handshake might have already started
		1851	when this function returns.
1369		1852
1370	If it an error to start a TLS handshake more than once per	1853	Due to bugs in OpenSSL, it might or might not be possible to do multiple
1371	AnyEvent::Handle object (this is due to bugs in OpenSSL).	1854	handshakes on the same stream. Best do not attempt to use the stream after
		1855	stopping TLS.
1372		1856
1373	=cut	1857	=cut
		1858
		1859	our %TLS_CACHE; #TODO not yet documented, should we?
1374		1860
1375	sub starttls {	1861	sub starttls {
1376	my ($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};
1377		1871
1378	require Net::SSLeay;	1872	require Net::SSLeay;
1379		1873
1380	Carp::croak "it is an error to call starttls more than once on an Anyevent::Handle object"	1874	$ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL ();
1381	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	}
1382		1892
1383	if ($ssl eq "accept") {	1893	$self->{tls_ctx} = $ctx || TLS_CTX ();
1384	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());	1894	$self->{tls} = $tls = $self->{tls_ctx}->_get_session ($tls, $self, $self->{peername});
1385	Net::SSLeay::set_accept_state ($ssl);
1386	} elsif ($ssl eq "connect") {
1387	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());
1388	Net::SSLeay::set_connect_state ($ssl);
1389	}
1390
1391	$self->{tls} = $ssl;
1392		1895
1393	# basically, this is deep magic (because SSL_read should have the same issues)	1896	# basically, this is deep magic (because SSL_read should have the same issues)
1394	# but the openssl maintainers basically said: "trust us, it just works".	1897	# but the openssl maintainers basically said: "trust us, it just works".
1395	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1898	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1396	# and mismaintained ssleay-module doesn't even offer them).	1899	# and mismaintained ssleay-module doesn't even offer them).
…		…
1400	#	1903	#
1401	# note that we do not try to keep the length constant between writes as we are required to do.	1904	# note that we do not try to keep the length constant between writes as we are required to do.
1402	# we assume that most (but not all) of this insanity only applies to non-blocking cases,	1905	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
1403	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to	1906	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
1404	# have identity issues in that area.	1907	# have identity issues in that area.
1405	Net::SSLeay::CTX_set_mode ($self->{tls},	1908	# Net::SSLeay::CTX_set_mode ($ssl,
1406	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)	1909	# (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)
1407	| (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);
1408		1912
1409	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1913	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1410	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1914	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1411		1915
		1916	Net::SSLeay::BIO_write ($self->{_rbio}, delete $self->{rbuf});
		1917
1412	Net::SSLeay::set_bio ($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};
1413		1922
1414	&_dotls; # need to trigger the initial handshake	1923	&_dotls; # need to trigger the initial handshake
1415	$self->start_read; # make sure we actually do read	1924	$self->start_read; # make sure we actually do read
1416	}	1925	}
1417		1926
1418	=item $handle->stoptls	1927	=item $handle->stoptls
1419		1928
1420	Shuts down the SSL connection - this makes a proper EOF handshake by	1929	Shuts down the SSL connection - this makes a proper EOF handshake by
1421	sending a close notify to the other side, but since OpenSSL doesn't	1930	sending a close notify to the other side, but since OpenSSL doesn't
1422	support non-blocking shut downs, it is not possible to re-use the stream	1931	support non-blocking shut downs, it is not guaranteed that you can re-use
1423	afterwards.	1932	the stream afterwards.
1424		1933
1425	=cut	1934	=cut
1426		1935
1427	sub stoptls {	1936	sub stoptls {
1428	my ($self) = @_;	1937	my ($self) = @_;
1429		1938
1430	if ($self->{tls}) {	1939	if ($self->{tls} && $self->{fh}) {
1431	Net::SSLeay::shutdown ($self->{tls});	1940	Net::SSLeay::shutdown ($self->{tls});
1432		1941
1433	&_dotls;	1942	&_dotls;
1434		1943
1435	# we don't give a shit. no, we do, but we can't. no...	1944	# # we don't give a shit. no, we do, but we can't. no...#d#
1436	# we, we... have to use openssl :/	1945	# # we, we... have to use openssl :/#d#
1437	&_freetls;	1946	# &_freetls;#d#
1438	}	1947	}
1439	}	1948	}
1440		1949
1441	sub _freetls {	1950	sub _freetls {
1442	my ($self) = @_;	1951	my ($self) = @_;
1443		1952
1444	return unless $self->{tls};	1953	return unless $self->{tls};
1445		1954
1446	Net::SSLeay::free (delete $self->{tls});	1955	$self->{tls_ctx}->_put_session (delete $self->{tls})
		1956	if $self->{tls} > 0;
1447		1957
1448	delete @$self{qw(_rbio _wbio _tls_wbuf)};	1958	delete @$self{qw(_rbio _wbio _tls_wbuf _on_starttls)};
1449	}	1959	}
1450		1960
1451	sub DESTROY {	1961	sub DESTROY {
1452	my $self = shift;	1962	my ($self) = @_;
1453		1963
1454	&_freetls;	1964	&_freetls;
1455		1965
1456	my $linger = exists $self->{linger} ? $self->{linger} : 3600;	1966	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
1457		1967
1458	if ($linger && length $self->{wbuf}) {	1968	if ($linger && length $self->{wbuf} && $self->{fh}) {
1459	my $fh = delete $self->{fh};	1969	my $fh = delete $self->{fh};
1460	my $wbuf = delete $self->{wbuf};	1970	my $wbuf = delete $self->{wbuf};
1461		1971
1462	my @linger;	1972	my @linger;
1463		1973
1464	push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub {	1974	push @linger, AE::io $fh, 1, sub {
1465	my $len = syswrite $fh, $wbuf, length $wbuf;	1975	my $len = syswrite $fh, $wbuf, length $wbuf;
1466		1976
1467	if ($len > 0) {	1977	if ($len > 0) {
1468	substr $wbuf, 0, $len, "";	1978	substr $wbuf, 0, $len, "";
1469	} else {	1979	} else {
1470	@linger = (); # end	1980	@linger = (); # end
1471	}	1981	}
1472	});	1982	};
1473	push @linger, AnyEvent->timer (after => $linger, cb => sub {	1983	push @linger, AE::timer $linger, 0, sub {
1474	@linger = ();	1984	@linger = ();
1475	});	1985	};
1476	}	1986	}
1477	}	1987	}
		1988
		1989	=item $handle->destroy
		1990
		1991	Shuts down the handle object as much as possible - this call ensures that
		1992	no further callbacks will be invoked and as many resources as possible
		1993	will be freed. Any method you will call on the handle object after
		1994	destroying it in this way will be silently ignored (and it will return the
		1995	empty list).
		1996
		1997	Normally, you can just "forget" any references to an AnyEvent::Handle
		1998	object and it will simply shut down. This works in fatal error and EOF
		1999	callbacks, as well as code outside. It does I<NOT> work in a read or write
		2000	callback, so when you want to destroy the AnyEvent::Handle object from
		2001	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
		2002	that case.
		2003
		2004	Destroying the handle object in this way has the advantage that callbacks
		2005	will be removed as well, so if those are the only reference holders (as
		2006	is common), then one doesn't need to do anything special to break any
		2007	reference cycles.
		2008
		2009	The handle might still linger in the background and write out remaining
		2010	data, as specified by the C<linger> option, however.
		2011
		2012	=cut
		2013
		2014	sub destroy {
		2015	my ($self) = @_;
		2016
		2017	$self->DESTROY;
		2018	%$self = ();
		2019	bless $self, "AnyEvent::Handle::destroyed";
		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 }
1478		2048
1479	=item AnyEvent::Handle::TLS_CTX	2049	=item AnyEvent::Handle::TLS_CTX
1480		2050
1481	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
1482	default for TLS mode.	2052	for TLS mode.
1483		2053
1484	The context is created like this:	2054	The context is created by calling L<AnyEvent::TLS> without any arguments.
1485
1486	Net::SSLeay::load_error_strings;
1487	Net::SSLeay::SSLeay_add_ssl_algorithms;
1488	Net::SSLeay::randomize;
1489
1490	my $CTX = Net::SSLeay::CTX_new;
1491
1492	Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL
1493		2055
1494	=cut	2056	=cut
1495		2057
1496	our $TLS_CTX;	2058	our $TLS_CTX;
1497		2059
1498	sub TLS_CTX() {	2060	sub TLS_CTX() {
1499	$TLS_CTX || do {	2061	$TLS_CTX ||= do {
1500	require Net::SSLeay;	2062	require AnyEvent::TLS;
1501		2063
1502	Net::SSLeay::load_error_strings ();	2064	new AnyEvent::TLS
1503	Net::SSLeay::SSLeay_add_ssl_algorithms ();
1504	Net::SSLeay::randomize ();
1505
1506	$TLS_CTX = Net::SSLeay::CTX_new ();
1507
1508	Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ());
1509
1510	$TLS_CTX
1511	}	2065	}
1512	}	2066	}
1513		2067
1514	=back	2068	=back
1515		2069
1516		2070
1517	=head1 NONFREQUENTLY ASKED QUESTIONS	2071	=head1 NONFREQUENTLY ASKED QUESTIONS
1518		2072
1519	=over 4	2073	=over 4
1520		2074
		2075	=item I C<undef> the AnyEvent::Handle reference inside my callback and
		2076	still get further invocations!
		2077
		2078	That's because AnyEvent::Handle keeps a reference to itself when handling
		2079	read or write callbacks.
		2080
		2081	It is only safe to "forget" the reference inside EOF or error callbacks,
		2082	from within all other callbacks, you need to explicitly call the C<<
		2083	->destroy >> method.
		2084
		2085	=item I get different callback invocations in TLS mode/Why can't I pause
		2086	reading?
		2087
		2088	Unlike, say, TCP, TLS connections do not consist of two independent
		2089	communication channels, one for each direction. Or put differently. The
		2090	read and write directions are not independent of each other: you cannot
		2091	write data unless you are also prepared to read, and vice versa.
		2092
		2093	This can mean than, in TLS mode, you might get C<on_error> or C<on_eof>
		2094	callback invocations when you are not expecting any read data - the reason
		2095	is that AnyEvent::Handle always reads in TLS mode.
		2096
		2097	During the connection, you have to make sure that you always have a
		2098	non-empty read-queue, or an C<on_read> watcher. At the end of the
		2099	connection (or when you no longer want to use it) you can call the
		2100	C<destroy> method.
		2101
1521	=item How do I read data until the other side closes the connection?	2102	=item How do I read data until the other side closes the connection?
1522		2103
1523	If you just want to read your data into a perl scalar, the easiest way to achieve this is	2104	If you just want to read your data into a perl scalar, the easiest way
1524	by setting an C<on_read> callback that does nothing, clearing the C<on_eof> callback	2105	to achieve this is by setting an C<on_read> callback that does nothing,
1525	and in the C<on_error> callback, the data will be in C<$_[0]{rbuf}>:	2106	clearing the C<on_eof> callback and in the C<on_error> callback, the data
		2107	will be in C<$_[0]{rbuf}>:
1526		2108
1527	$handle->on_read (sub { });	2109	$handle->on_read (sub { });
1528	$handle->on_eof (undef);	2110	$handle->on_eof (undef);
1529	$handle->on_error (sub {	2111	$handle->on_error (sub {
1530	my $data = delete $_[0]{rbuf};	2112	my $data = delete $_[0]{rbuf};
1531	undef $handle;
1532	});	2113	});
1533		2114
1534	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
1535	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
1536	fact, all data has been received.	2117	fact, all data has been received.
1537		2118
1538	It is usually better to use acknowledgements when transfering data,	2119	It is usually better to use acknowledgements when transferring data,
1539	to make sure the other side hasn't just died and you got the data	2120	to make sure the other side hasn't just died and you got the data
1540	intact. This is also one reason why so many internet protocols have an	2121	intact. This is also one reason why so many internet protocols have an
1541	explicit QUIT command.	2122	explicit QUIT command.
1542		2123
1543
1544	=item I don't want to destroy the handle too early - how do I wait until all data has been sent?	2124	=item I don't want to destroy the handle too early - how do I wait until
		2125	all data has been written?
1545		2126
1546	After writing your last bits of data, set the C<on_drain> callback	2127	After writing your last bits of data, set the C<on_drain> callback
1547	and destroy the handle in there - with the default setting of	2128	and destroy the handle in there - with the default setting of
1548	C<low_water_mark> this will be called precisely when all data has been	2129	C<low_water_mark> this will be called precisely when all data has been
1549	written to the socket:	2130	written to the socket:
…		…
1552	$handle->on_drain (sub {	2133	$handle->on_drain (sub {
1553	warn "all data submitted to the kernel\n";	2134	warn "all data submitted to the kernel\n";
1554	undef $handle;	2135	undef $handle;
1555	});	2136	});
1556		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
1557	=back	2226	=back
1558		2227
1559		2228
1560	=head1 SUBCLASSING AnyEvent::Handle	2229	=head1 SUBCLASSING AnyEvent::Handle
1561		2230

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