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Revision 1.93 by root, Wed Oct 1 14:49:23 2008 UTC vs.
Revision 1.185 by root, Thu Sep 3 19:48:27 2009 UTC

1	package AnyEvent::Handle;
2
3	no warnings;
4	use strict qw(subs vars);
5
6	use AnyEvent ();
7	use AnyEvent::Util qw(WSAEWOULDBLOCK);
8	use Scalar::Util ();
9	use Carp ();
10	use Fcntl ();
11	use Errno qw(EAGAIN EINTR);
12
13	=head1 NAME	1	=head1 NAME
14		2
15	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent	3	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent
16
17	=cut
18
19	our $VERSION = 4.3;
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::TLS 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<$retry> will continue with the next conenction target (in case of
		135	multi-homed hosts or SRV records there can be multiple connection
		136	endpoints). When it is called then the read and write queues, eof status,
		137	tls status and similar properties of the handle are being reset.
		138
		139	In most cases, ignoring the C<$retry> parameter is the way to go.
		140
		141	=item on_connect_error => $cb->($handle, $message)
		142
		143	This callback is called when the conenction could not be
		144	established. C<$!> will contain the relevant error code, and C<$message> a
		145	message describing it (usually the same as C<"$!">).
		146
		147	If this callback isn't specified, then C<on_error> will be called with a
		148	fatal error instead.
		149
		150	=back
		151
108	=item on_error => $cb->($handle, $fatal)	152	=item on_error => $cb->($handle, $fatal, $message)
109		153
110	This is the error callback, which is called when, well, some error	154	This is the error callback, which is called when, well, some error
111	occured, such as not being able to resolve the hostname, failure to	155	occured, such as not being able to resolve the hostname, failure to
112	connect or a read error.	156	connect or a read error.
113		157
114	Some errors are fatal (which is indicated by C<$fatal> being true). On	158	Some errors are fatal (which is indicated by C<$fatal> being true). On
115	fatal errors the handle object will be shut down and will not be usable	159	fatal errors the handle object will be destroyed (by a call to C<< ->
116	(but you are free to look at the current C<< ->rbuf >>). Examples of fatal	160	destroy >>) after invoking the error callback (which means you are free to
117	errors are an EOF condition with active (but unsatisifable) read watchers	161	examine the handle object). Examples of fatal errors are an EOF condition
118	(C<EPIPE>) or I/O errors.	162	with active (but unsatisifable) read watchers (C<EPIPE>) or I/O errors. In
		163	cases where the other side can close the connection at their will it is
		164	often easiest to not report C<EPIPE> errors in this callback.
		165
		166	AnyEvent::Handle tries to find an appropriate error code for you to check
		167	against, but in some cases (TLS errors), this does not work well. It is
		168	recommended to always output the C<$message> argument in human-readable
		169	error messages (it's usually the same as C<"$!">).
119		170
120	Non-fatal errors can be retried by simply returning, but it is recommended	171	Non-fatal errors can be retried by simply returning, but it is recommended
121	to simply ignore this parameter and instead abondon the handle object	172	to simply ignore this parameter and instead abondon the handle object
122	when this callback is invoked. Examples of non-fatal errors are timeouts	173	when this callback is invoked. Examples of non-fatal errors are timeouts
123	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).	174	C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>).
124		175
125	On callback entrance, the value of C<$!> contains the operating system	176	On callback entrance, the value of C<$!> contains the operating system
126	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).	177	error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or
		178	C<EPROTO>).
127		179
128	While not mandatory, it is I<highly> recommended to set this callback, as	180	While not mandatory, it is I<highly> recommended to set this callback, as
129	you will not be notified of errors otherwise. The default simply calls	181	you will not be notified of errors otherwise. The default simply calls
130	C<croak>.	182	C<croak>.
131		183
…		…
135	and no read request is in the queue (unlike read queue callbacks, this	187	and no read request is in the queue (unlike read queue callbacks, this
136	callback will only be called when at least one octet of data is in the	188	callback will only be called when at least one octet of data is in the
137	read buffer).	189	read buffer).
138		190
139	To access (and remove data from) the read buffer, use the C<< ->rbuf >>	191	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
140	method or access the C<$handle->{rbuf}> member directly.	192	method or access the C<< $handle->{rbuf} >> member directly. Note that you
		193	must not enlarge or modify the read buffer, you can only remove data at
		194	the beginning from it.
141		195
142	When an EOF condition is detected then AnyEvent::Handle will first try to	196	When an EOF condition is detected then AnyEvent::Handle will first try to
143	feed all the remaining data to the queued callbacks and C<on_read> before	197	feed all the remaining data to the queued callbacks and C<on_read> before
144	calling the C<on_eof> callback. If no progress can be made, then a fatal	198	calling the C<on_eof> callback. If no progress can be made, then a fatal
145	error will be raised (with C<$!> set to C<EPIPE>).	199	error will be raised (with C<$!> set to C<EPIPE>).
		200
		201	Note that, unlike requests in the read queue, an C<on_read> callback
		202	doesn't mean you I<require> some data: if there is an EOF and there
		203	are outstanding read requests then an error will be flagged. With an
		204	C<on_read> callback, the C<on_eof> callback will be invoked.
		205
		206	=item on_eof => $cb->($handle)
		207
		208	Set the callback to be called when an end-of-file condition is detected,
		209	i.e. in the case of a socket, when the other side has closed the
		210	connection cleanly, and there are no outstanding read requests in the
		211	queue (if there are read requests, then an EOF counts as an unexpected
		212	connection close and will be flagged as an error).
		213
		214	For sockets, this just means that the other side has stopped sending data,
		215	you can still try to write data, and, in fact, one can return from the EOF
		216	callback and continue writing data, as only the read part has been shut
		217	down.
		218
		219	If an EOF condition has been detected but no C<on_eof> callback has been
		220	set, then a fatal error will be raised with C<$!> set to <0>.
146		221
147	=item on_drain => $cb->($handle)	222	=item on_drain => $cb->($handle)
148		223
149	This sets the callback that is called when the write buffer becomes empty	224	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).	225	(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	232	memory and push it into the queue, but instead only read more data from
158	the file when the write queue becomes empty.	233	the file when the write queue becomes empty.
159		234
160	=item timeout => $fractional_seconds	235	=item timeout => $fractional_seconds
161		236
		237	=item rtimeout => $fractional_seconds
		238
		239	=item wtimeout => $fractional_seconds
		240
162	If non-zero, then this enables an "inactivity" timeout: whenever this many	241	If non-zero, then these enables an "inactivity" timeout: whenever this
163	seconds pass without a successful read or write on the underlying file	242	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	243	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).	244	will be invoked (and if that one is missing, a non-fatal C<ETIMEDOUT>
		245	error will be raised).
		246
		247	There are three variants of the timeouts that work fully independent
		248	of each other, for both read and write, just read, and just write:
		249	C<timeout>, C<rtimeout> and C<wtimeout>, with corresponding callbacks
		250	C<on_timeout>, C<on_rtimeout> and C<on_wtimeout>, and reset functions
		251	C<timeout_reset>, C<rtimeout_reset>, and C<wtimeout_reset>.
166		252
167	Note that timeout processing is also active when you currently do not have	253	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	254	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	255	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	256	in the C<on_timeout> callback, in which case AnyEvent::Handle will simply
…		…
214	accomplishd by setting this option to a true value.	300	accomplishd by setting this option to a true value.
215		301
216	The default is your opertaing system's default behaviour (most likely	302	The default is your opertaing system's default behaviour (most likely
217	enabled), this option explicitly enables or disables it, if possible.	303	enabled), this option explicitly enables or disables it, if possible.
218		304
		305	=item keepalive => <boolean>
		306
		307	Enables (default disable) the SO_KEEPALIVE option on the stream socket:
		308	normally, TCP connections have no time-out once established, so TCP
		309	conenctions, once established, can stay alive forever even when the other
		310	side has long gone. TCP keepalives are a cheap way to take down long-lived
		311	TCP connections whent he other side becomes unreachable. While the default
		312	is OS-dependent, TCP keepalives usually kick in after around two hours,
		313	and, if the other side doesn't reply, take down the TCP connection some 10
		314	to 15 minutes later.
		315
		316	It is harmless to specify this option for file handles that do not support
		317	keepalives, and enabling it on connections that are potentially long-lived
		318	is usually a good idea.
		319
		320	=item oobinline => <boolean>
		321
		322	BSD majorly fucked up the implementation of TCP urgent data. The result
		323	is that almost no OS implements TCP according to the specs, and every OS
		324	implements it slightly differently.
		325
		326	If you want to handle TCP urgent data, then setting this flag (the default
		327	is enabled) gives you the most portable way of getting urgent data, by
		328	putting it into the stream.
		329
		330	Since BSD emulation of OOB data on top of TCP's urgent data can have
		331	security implications, AnyEvent::Handle sets this flag automatically
		332	unless explicitly specified. Note that setting this flag after
		333	establishing a connection I<may> be a bit too late (data loss could
		334	already have occured on BSD systems), but at least it will protect you
		335	from most attacks.
		336
219	=item read_size => <bytes>	337	=item read_size => <bytes>
220		338
221	The default read block size (the amount of bytes this module will	339	The default read block size (the amount of bytes this module will
222	try to read during each loop iteration, which affects memory	340	try to read during each loop iteration, which affects memory
223	requirements). Default: C<8192>.	341	requirements). Default: C<8192>.
…		…
243		361
244	This will not work for partial TLS data that could not be encoded	362	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	363	yet. This data will be lost. Calling the C<stoptls> method in time might
246	help.	364	help.
247		365
		366	=item peername => $string
		367
		368	A string used to identify the remote site - usually the DNS hostname
		369	(I<not> IDN!) used to create the connection, rarely the IP address.
		370
		371	Apart from being useful in error messages, this string is also used in TLS
		372	peername verification (see C<verify_peername> in L<AnyEvent::TLS>). This
		373	verification will be skipped when C<peername> is not specified or
		374	C<undef>.
		375
248	=item tls => "accept" | "connect" | Net::SSLeay::SSL object	376	=item tls => "accept" | "connect" | Net::SSLeay::SSL object
249		377
250	When this parameter is given, it enables TLS (SSL) mode, that means	378	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	379	AnyEvent will start a TLS handshake as soon as the conenction has been
252	established and will transparently encrypt/decrypt data afterwards.	380	established and will transparently encrypt/decrypt data afterwards.
		381
		382	All TLS protocol errors will be signalled as C<EPROTO>, with an
		383	appropriate error message.
253		384
254	TLS mode requires Net::SSLeay to be installed (it will be loaded	385	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	386	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	387	have a dependency on that module, so if your module requires it, you have
257	to add the dependency yourself.	388	to add the dependency yourself.
…		…
261	mode.	392	mode.
262		393
263	You can also provide your own TLS connection object, but you have	394	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>	395	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	396	or C<Net::SSLeay::set_accept_state> on it before you pass it to
266	AnyEvent::Handle.	397	AnyEvent::Handle. Also, this module will take ownership of this connection
		398	object.
		399
		400	At some future point, AnyEvent::Handle might switch to another TLS
		401	implementation, then the option to use your own session object will go
		402	away.
		403
		404	B<IMPORTANT:> since Net::SSLeay "objects" are really only integers,
		405	passing in the wrong integer will lead to certain crash. This most often
		406	happens when one uses a stylish C<< tls => 1 >> and is surprised about the
		407	segmentation fault.
267		408
268	See the C<< ->starttls >> method for when need to start TLS negotiation later.	409	See the C<< ->starttls >> method for when need to start TLS negotiation later.
269		410
270	=item tls_ctx => $ssl_ctx	411	=item tls_ctx => $anyevent_tls
271		412
272	Use the given C<Net::SSLeay::CTX> object to create the new TLS connection	413	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	414	(unless a connection object was specified directly). If this parameter is
274	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	415	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
		416
		417	Instead of an object, you can also specify a hash reference with C<< key
		418	=> value >> pairs. Those will be passed to L<AnyEvent::TLS> to create a
		419	new TLS context object.
		420
		421	=item on_starttls => $cb->($handle, $success[, $error_message])
		422
		423	This callback will be invoked when the TLS/SSL handshake has finished. If
		424	C<$success> is true, then the TLS handshake succeeded, otherwise it failed
		425	(C<on_stoptls> will not be called in this case).
		426
		427	The session in C<< $handle->{tls} >> can still be examined in this
		428	callback, even when the handshake was not successful.
		429
		430	TLS handshake failures will not cause C<on_error> to be invoked when this
		431	callback is in effect, instead, the error message will be passed to C<on_starttls>.
		432
		433	Without this callback, handshake failures lead to C<on_error> being
		434	called, as normal.
		435
		436	Note that you cannot call C<starttls> right again in this callback. If you
		437	need to do that, start an zero-second timer instead whose callback can
		438	then call C<< ->starttls >> again.
		439
		440	=item on_stoptls => $cb->($handle)
		441
		442	When a SSLv3/TLS shutdown/close notify/EOF is detected and this callback is
		443	set, then it will be invoked after freeing the TLS session. If it is not,
		444	then a TLS shutdown condition will be treated like a normal EOF condition
		445	on the handle.
		446
		447	The session in C<< $handle->{tls} >> can still be examined in this
		448	callback.
		449
		450	This callback will only be called on TLS shutdowns, not when the
		451	underlying handle signals EOF.
275		452
276	=item json => JSON or JSON::XS object	453	=item json => JSON or JSON::XS object
277		454
278	This is the json coder object used by the C<json> read and write types.	455	This is the json coder object used by the C<json> read and write types.
279		456
…		…
288		465
289	=cut	466	=cut
290		467
291	sub new {	468	sub new {
292	my $class = shift;	469	my $class = shift;
293
294	my $self = bless { @_ }, $class;	470	my $self = bless { @_ }, $class;
295		471
296	$self->{fh} or Carp::croak "mandatory argument fh is missing";	472	if ($self->{fh}) {
		473	$self->_start;
		474	return unless $self->{fh}; # could be gone by now
		475
		476	} elsif ($self->{connect}) {
		477	require AnyEvent::Socket;
		478
		479	$self->{peername} = $self->{connect}[0]
		480	unless exists $self->{peername};
		481
		482	$self->{_skip_drain_rbuf} = 1;
		483
		484	{
		485	Scalar::Util::weaken (my $self = $self);
		486
		487	$self->{_connect} =
		488	AnyEvent::Socket::tcp_connect (
		489	$self->{connect}[0],
		490	$self->{connect}[1],
		491	sub {
		492	my ($fh, $host, $port, $retry) = @_;
		493
		494	if ($fh) {
		495	$self->{fh} = $fh;
		496
		497	delete $self->{_skip_drain_rbuf};
		498	$self->_start;
		499
		500	$self->{on_connect}
		501	and $self->{on_connect}($self, $host, $port, sub {
		502	delete @$self{qw(fh _tw _rtw _wtw _ww _rw _eof _queue rbuf _wbuf tls _tls_rbuf _tls_wbuf)};
		503	$self->{_skip_drain_rbuf} = 1;
		504	&$retry;
		505	});
		506
		507	} else {
		508	if ($self->{on_connect_error}) {
		509	$self->{on_connect_error}($self, "$!");
		510	$self->destroy;
		511	} else {
		512	$self->_error ($!, 1);
		513	}
		514	}
		515	},
		516	sub {
		517	local $self->{fh} = $_[0];
		518
		519	$self->{on_prepare}
		520	? $self->{on_prepare}->($self)
		521	: ()
		522	}
		523	);
		524	}
		525
		526	} else {
		527	Carp::croak "AnyEvent::Handle: either an existing fh or the connect parameter must be specified";
		528	}
		529
		530	$self
		531	}
		532
		533	sub _start {
		534	my ($self) = @_;
297		535
298	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	536	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
299		537
300	if ($self->{tls}) {	538	$self->{_activity} =
301	require Net::SSLeay;	539	$self->{_ractivity} =
		540	$self->{_wactivity} = AE::now;
		541
		542	$self->timeout (delete $self->{timeout} ) if $self->{timeout};
		543	$self->rtimeout (delete $self->{rtimeout} ) if $self->{rtimeout};
		544	$self->wtimeout (delete $self->{wtimeout} ) if $self->{wtimeout};
		545
		546	$self->no_delay (delete $self->{no_delay} ) if exists $self->{no_delay} && $self->{no_delay};
		547	$self->keepalive (delete $self->{keepalive}) if exists $self->{keepalive} && $self->{keepalive};
		548
		549	$self->oobinline (exists $self->{oobinline} ? delete $self->{oobinline} : 1);
		550
302	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});	551	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})
303	}	552	if $self->{tls};
304		553
305	$self->{_activity} = AnyEvent->now;
306	$self->_timeout;
307
308	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};	554	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};
309	$self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay};
310		555
311	$self->start_read	556	$self->start_read
312	if $self->{on_read};	557	if $self->{on_read} || @{ $self->{_queue} };
313		558
314	$self	559	$self->_drain_wbuf;
315	}
316
317	sub _shutdown {
318	my ($self) = @_;
319
320	delete $self->{_tw};
321	delete $self->{_rw};
322	delete $self->{_ww};
323	delete $self->{fh};
324
325	&_freetls;
326
327	delete $self->{on_read};
328	delete $self->{_queue};
329	}	560	}
330		561
331	sub _error {	562	sub _error {
332	my ($self, $errno, $fatal) = @_;	563	my ($self, $errno, $fatal, $message) = @_;
333
334	$self->_shutdown
335	if $fatal;
336		564
337	$! = $errno;	565	$! = $errno;
		566	$message ||= "$!";
338		567
339	if ($self->{on_error}) {	568	if ($self->{on_error}) {
340	$self->{on_error}($self, $fatal);	569	$self->{on_error}($self, $fatal, $message);
341	} else {	570	$self->destroy if $fatal;
		571	} elsif ($self->{fh}) {
		572	$self->destroy;
342	Carp::croak "AnyEvent::Handle uncaught error: $!";	573	Carp::croak "AnyEvent::Handle uncaught error: $message";
343	}	574	}
344	}	575	}
345		576
346	=item $fh = $handle->fh	577	=item $fh = $handle->fh
347		578
…		…
371	$_[0]{on_eof} = $_[1];	602	$_[0]{on_eof} = $_[1];
372	}	603	}
373		604
374	=item $handle->on_timeout ($cb)	605	=item $handle->on_timeout ($cb)
375		606
376	Replace the current C<on_timeout> callback, or disables the callback (but	607	=item $handle->on_rtimeout ($cb)
377	not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor
378	argument and method.
379		608
380	=cut	609	=item $handle->on_wtimeout ($cb)
381		610
382	sub on_timeout {	611	Replace the current C<on_timeout>, C<on_rtimeout> or C<on_wtimeout>
383	$_[0]{on_timeout} = $_[1];	612	callback, or disables the callback (but not the timeout) if C<$cb> =
384	}	613	C<undef>. See the C<timeout> constructor argument and method.
		614
		615	=cut
		616
		617	# see below
385		618
386	=item $handle->autocork ($boolean)	619	=item $handle->autocork ($boolean)
387		620
388	Enables or disables the current autocork behaviour (see C<autocork>	621	Enables or disables the current autocork behaviour (see C<autocork>
389	constructor argument).	622	constructor argument). Changes will only take effect on the next write.
390		623
391	=cut	624	=cut
		625
		626	sub autocork {
		627	$_[0]{autocork} = $_[1];
		628	}
392		629
393	=item $handle->no_delay ($boolean)	630	=item $handle->no_delay ($boolean)
394		631
395	Enables or disables the C<no_delay> setting (see constructor argument of	632	Enables or disables the C<no_delay> setting (see constructor argument of
396	the same name for details).	633	the same name for details).
…		…
400	sub no_delay {	637	sub no_delay {
401	$_[0]{no_delay} = $_[1];	638	$_[0]{no_delay} = $_[1];
402		639
403	eval {	640	eval {
404	local $SIG{__DIE__};	641	local $SIG{__DIE__};
405	setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1];	642	setsockopt $_[0]{fh}, Socket::IPPROTO_TCP (), Socket::TCP_NODELAY (), int $_[1]
		643	if $_[0]{fh};
406	};	644	};
407	}	645	}
408		646
		647	=item $handle->keepalive ($boolean)
		648
		649	Enables or disables the C<keepalive> setting (see constructor argument of
		650	the same name for details).
		651
		652	=cut
		653
		654	sub keepalive {
		655	$_[0]{keepalive} = $_[1];
		656
		657	eval {
		658	local $SIG{__DIE__};
		659	setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_KEEPALIVE (), int $_[1]
		660	if $_[0]{fh};
		661	};
		662	}
		663
		664	=item $handle->oobinline ($boolean)
		665
		666	Enables or disables the C<oobinline> setting (see constructor argument of
		667	the same name for details).
		668
		669	=cut
		670
		671	sub oobinline {
		672	$_[0]{oobinline} = $_[1];
		673
		674	eval {
		675	local $SIG{__DIE__};
		676	setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_OOBINLINE (), int $_[1]
		677	if $_[0]{fh};
		678	};
		679	}
		680
		681	=item $handle->keepalive ($boolean)
		682
		683	Enables or disables the C<keepalive> setting (see constructor argument of
		684	the same name for details).
		685
		686	=cut
		687
		688	sub keepalive {
		689	$_[0]{keepalive} = $_[1];
		690
		691	eval {
		692	local $SIG{__DIE__};
		693	setsockopt $_[0]{fh}, Socket::SOL_SOCKET (), Socket::SO_KEEPALIVE (), int $_[1]
		694	if $_[0]{fh};
		695	};
		696	}
		697
		698	=item $handle->on_starttls ($cb)
		699
		700	Replace the current C<on_starttls> callback (see the C<on_starttls> constructor argument).
		701
		702	=cut
		703
		704	sub on_starttls {
		705	$_[0]{on_starttls} = $_[1];
		706	}
		707
		708	=item $handle->on_stoptls ($cb)
		709
		710	Replace the current C<on_stoptls> callback (see the C<on_stoptls> constructor argument).
		711
		712	=cut
		713
		714	sub on_starttls {
		715	$_[0]{on_stoptls} = $_[1];
		716	}
		717
		718	=item $handle->rbuf_max ($max_octets)
		719
		720	Configures the C<rbuf_max> setting (C<undef> disables it).
		721
		722	=cut
		723
		724	sub rbuf_max {
		725	$_[0]{rbuf_max} = $_[1];
		726	}
		727
409	#############################################################################	728	#############################################################################
410		729
411	=item $handle->timeout ($seconds)	730	=item $handle->timeout ($seconds)
412		731
		732	=item $handle->rtimeout ($seconds)
		733
		734	=item $handle->wtimeout ($seconds)
		735
413	Configures (or disables) the inactivity timeout.	736	Configures (or disables) the inactivity timeout.
414		737
415	=cut	738	=item $handle->timeout_reset
416		739
417	sub timeout {	740	=item $handle->rtimeout_reset
		741
		742	=item $handle->wtimeout_reset
		743
		744	Reset the activity timeout, as if data was received or sent.
		745
		746	These methods are cheap to call.
		747
		748	=cut
		749
		750	for my $dir ("", "r", "w") {
		751	my $timeout = "${dir}timeout";
		752	my $tw = "_${dir}tw";
		753	my $on_timeout = "on_${dir}timeout";
		754	my $activity = "_${dir}activity";
		755	my $cb;
		756
		757	*$on_timeout = sub {
		758	$_[0]{$on_timeout} = $_[1];
		759	};
		760
		761	*$timeout = sub {
418	my ($self, $timeout) = @_;	762	my ($self, $new_value) = @_;
419		763
420	$self->{timeout} = $timeout;	764	$self->{$timeout} = $new_value;
421	$self->_timeout;	765	delete $self->{$tw}; &$cb;
422	}	766	};
423		767
		768	*{"${dir}timeout_reset"} = sub {
		769	$_[0]{$activity} = AE::now;
		770	};
		771
		772	# main workhorse:
424	# reset the timeout watcher, as neccessary	773	# reset the timeout watcher, as neccessary
425	# also check for time-outs	774	# also check for time-outs
426	sub _timeout {	775	$cb = sub {
427	my ($self) = @_;	776	my ($self) = @_;
428		777
429	if ($self->{timeout}) {	778	if ($self->{$timeout} && $self->{fh}) {
430	my $NOW = AnyEvent->now;	779	my $NOW = AE::now;
431		780
432	# when would the timeout trigger?	781	# when would the timeout trigger?
433	my $after = $self->{_activity} + $self->{timeout} - $NOW;	782	my $after = $self->{$activity} + $self->{$timeout} - $NOW;
434		783
435	# now or in the past already?	784	# now or in the past already?
436	if ($after <= 0) {	785	if ($after <= 0) {
437	$self->{_activity} = $NOW;	786	$self->{$activity} = $NOW;
438		787
439	if ($self->{on_timeout}) {	788	if ($self->{$on_timeout}) {
440	$self->{on_timeout}($self);	789	$self->{$on_timeout}($self);
441	} else {	790	} else {
442	$self->_error (&Errno::ETIMEDOUT);	791	$self->_error (Errno::ETIMEDOUT);
		792	}
		793
		794	# callback could have changed timeout value, optimise
		795	return unless $self->{$timeout};
		796
		797	# calculate new after
		798	$after = $self->{$timeout};
443	}	799	}
444		800
445	# callback could have changed timeout value, optimise	801	Scalar::Util::weaken $self;
446	return unless $self->{timeout};	802	return unless $self; # ->error could have destroyed $self
447		803
448	# calculate new after	804	$self->{$tw} ||= AE::timer $after, 0, sub {
449	$after = $self->{timeout};	805	delete $self->{$tw};
		806	$cb->($self);
		807	};
		808	} else {
		809	delete $self->{$tw};
450	}	810	}
451
452	Scalar::Util::weaken $self;
453	return unless $self; # ->error could have destroyed $self
454
455	$self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub {
456	delete $self->{_tw};
457	$self->_timeout;
458	});
459	} else {
460	delete $self->{_tw};
461	}	811	}
462	}	812	}
463		813
464	#############################################################################	814	#############################################################################
465		815
…		…
510	Scalar::Util::weaken $self;	860	Scalar::Util::weaken $self;
511		861
512	my $cb = sub {	862	my $cb = sub {
513	my $len = syswrite $self->{fh}, $self->{wbuf};	863	my $len = syswrite $self->{fh}, $self->{wbuf};
514		864
515	if ($len >= 0) {	865	if (defined $len) {
516	substr $self->{wbuf}, 0, $len, "";	866	substr $self->{wbuf}, 0, $len, "";
517		867
518	$self->{_activity} = AnyEvent->now;	868	$self->{_activity} = $self->{_wactivity} = AE::now;
519		869
520	$self->{on_drain}($self)	870	$self->{on_drain}($self)
521	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})	871	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
522	&& $self->{on_drain};	872	&& $self->{on_drain};
523		873
…		…
529		879
530	# try to write data immediately	880	# try to write data immediately
531	$cb->() unless $self->{autocork};	881	$cb->() unless $self->{autocork};
532		882
533	# if still data left in wbuf, we need to poll	883	# if still data left in wbuf, we need to poll
534	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)	884	$self->{_ww} = AE::io $self->{fh}, 1, $cb
535	if length $self->{wbuf};	885	if length $self->{wbuf};
536	};	886	};
537	}	887	}
538		888
539	our %WH;	889	our %WH;
540		890
		891	# deprecated
541	sub register_write_type($$) {	892	sub register_write_type($$) {
542	$WH{$_[0]} = $_[1];	893	$WH{$_[0]} = $_[1];
543	}	894	}
544		895
545	sub push_write {	896	sub push_write {
546	my $self = shift;	897	my $self = shift;
547		898
548	if (@_ > 1) {	899	if (@_ > 1) {
549	my $type = shift;	900	my $type = shift;
550		901
		902	@_ = ($WH{$type} ||= _load_func "$type\::anyevent_write_type"
551	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")	903	or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::push_write")
552	->($self, @_);	904	->($self, @_);
553	}	905	}
554		906
555	if ($self->{tls}) {	907	if ($self->{tls}) {
556	$self->{_tls_wbuf} .= $_[0];	908	$self->{_tls_wbuf} .= $_[0];
557	&_dotls ($self);	909	&_dotls ($self) if $self->{fh};
558	} else {	910	} else {
559	$self->{wbuf} .= $_[0];	911	$self->{wbuf} .= $_[0];
560	$self->_drain_wbuf;	912	$self->_drain_wbuf if $self->{fh};
561	}	913	}
562	}	914	}
563		915
564	=item $handle->push_write (type => @args)	916	=item $handle->push_write (type => @args)
565		917
566	Instead of formatting your data yourself, you can also let this module do	918	Instead of formatting your data yourself, you can also let this module
567	the job by specifying a type and type-specific arguments.	919	do the job by specifying a type and type-specific arguments. You
		920	can also specify the (fully qualified) name of a package, in which
		921	case AnyEvent tries to load the package and then expects to find the
		922	C<anyevent_read_type> function inside (see "custom write types", below).
568		923
569	Predefined types are (if you have ideas for additional types, feel free to	924	Predefined types are (if you have ideas for additional types, feel free to
570	drop by and tell us):	925	drop by and tell us):
571		926
572	=over 4	927	=over 4
…		…
579	=cut	934	=cut
580		935
581	register_write_type netstring => sub {	936	register_write_type netstring => sub {
582	my ($self, $string) = @_;	937	my ($self, $string) = @_;
583		938
584	sprintf "%d:%s,", (length $string), $string	939	(length $string) . ":$string,"
585	};	940	};
586		941
587	=item packstring => $format, $data	942	=item packstring => $format, $data
588		943
589	An octet string prefixed with an encoded length. The encoding C<$format>	944	An octet string prefixed with an encoded length. The encoding C<$format>
…		…
629	Other languages could read single lines terminated by a newline and pass	984	Other languages could read single lines terminated by a newline and pass
630	this line into their JSON decoder of choice.	985	this line into their JSON decoder of choice.
631		986
632	=cut	987	=cut
633		988
		989	sub json_coder() {
		990	eval { require JSON::XS; JSON::XS->new->utf8 }
		991	|| do { require JSON; JSON->new->utf8 }
		992	}
		993
634	register_write_type json => sub {	994	register_write_type json => sub {
635	my ($self, $ref) = @_;	995	my ($self, $ref) = @_;
636		996
637	require JSON;	997	my $json = $self->{json} ||= json_coder;
638		998
639	$self->{json} ? $self->{json}->encode ($ref)	999	$json->encode ($ref)
640	: JSON::encode_json ($ref)
641	};	1000	};
642		1001
643	=item storable => $reference	1002	=item storable => $reference
644		1003
645	Freezes the given reference using L<Storable> and writes it to the	1004	Freezes the given reference using L<Storable> and writes it to the
…		…
655	pack "w/a*", Storable::nfreeze ($ref)	1014	pack "w/a*", Storable::nfreeze ($ref)
656	};	1015	};
657		1016
658	=back	1017	=back
659		1018
660	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)	1019	=item $handle->push_shutdown
661		1020
662	This function (not method) lets you add your own types to C<push_write>.	1021	Sometimes you know you want to close the socket after writing your data
		1022	before it was actually written. One way to do that is to replace your
		1023	C<on_drain> handler by a callback that shuts down the socket (and set
		1024	C<low_water_mark> to C<0>). This method is a shorthand for just that, and
		1025	replaces the C<on_drain> callback with:
		1026
		1027	sub { shutdown $_[0]{fh}, 1 } # for push_shutdown
		1028
		1029	This simply shuts down the write side and signals an EOF condition to the
		1030	the peer.
		1031
		1032	You can rely on the normal read queue and C<on_eof> handling
		1033	afterwards. This is the cleanest way to close a connection.
		1034
		1035	=cut
		1036
		1037	sub push_shutdown {
		1038	my ($self) = @_;
		1039
		1040	delete $self->{low_water_mark};
		1041	$self->on_drain (sub { shutdown $_[0]{fh}, 1 });
		1042	}
		1043
		1044	=item custom write types - Package::anyevent_write_type $handle, @args
		1045
		1046	Instead of one of the predefined types, you can also specify the name of
		1047	a package. AnyEvent will try to load the package and then expects to find
		1048	a function named C<anyevent_write_type> inside. If it isn't found, it
		1049	progressively tries to load the parent package until it either finds the
		1050	function (good) or runs out of packages (bad).
		1051
663	Whenever the given C<type> is used, C<push_write> will invoke the code	1052	Whenever the given C<type> is used, C<push_write> will the function with
664	reference with the handle object and the remaining arguments.	1053	the handle object and the remaining arguments.
665		1054
666	The code reference is supposed to return a single octet string that will	1055	The function is supposed to return a single octet string that will be
667	be appended to the write buffer.	1056	appended to the write buffer, so you cna mentally treat this function as a
		1057	"arguments to on-the-wire-format" converter.
668		1058
669	Note that this is a function, and all types registered this way will be	1059	Example: implement a custom write type C<join> that joins the remaining
670	global, so try to use unique names.	1060	arguments using the first one.
		1061
		1062	$handle->push_write (My::Type => " ", 1,2,3);
		1063
		1064	# uses the following package, which can be defined in the "My::Type" or in
		1065	# the "My" modules to be auto-loaded, or just about anywhere when the
		1066	# My::Type::anyevent_write_type is defined before invoking it.
		1067
		1068	package My::Type;
		1069
		1070	sub anyevent_write_type {
		1071	my ($handle, $delim, @args) = @_;
		1072
		1073	join $delim, @args
		1074	}
671		1075
672	=cut	1076	=cut
673		1077
674	#############################################################################	1078	#############################################################################
675		1079
…		…
757	=cut	1161	=cut
758		1162
759	sub _drain_rbuf {	1163	sub _drain_rbuf {
760	my ($self) = @_;	1164	my ($self) = @_;
761		1165
		1166	# avoid recursion
		1167	return if $self->{_skip_drain_rbuf};
762	local $self->{_in_drain} = 1;	1168	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		1169
771	while () {	1170	while () {
		1171	# we need to use a separate tls read buffer, as we must not receive data while
		1172	# we are draining the buffer, and this can only happen with TLS.
		1173	$self->{rbuf} .= delete $self->{_tls_rbuf}
		1174	if exists $self->{_tls_rbuf};
		1175
772	my $len = length $self->{rbuf};	1176	my $len = length $self->{rbuf};
773		1177
774	if (my $cb = shift @{ $self->{_queue} }) {	1178	if (my $cb = shift @{ $self->{_queue} }) {
775	unless ($cb->($self)) {	1179	unless ($cb->($self)) {
776	if ($self->{_eof}) {	1180	# no progress can be made
777	# no progress can be made (not enough data and no data forthcoming)	1181	# (not enough data and no data forthcoming)
778	$self->_error (&Errno::EPIPE, 1), return;	1182	$self->_error (Errno::EPIPE, 1), return
779	}	1183	if $self->{_eof};
780		1184
781	unshift @{ $self->{_queue} }, $cb;	1185	unshift @{ $self->{_queue} }, $cb;
782	last;	1186	last;
783	}	1187	}
784	} elsif ($self->{on_read}) {	1188	} elsif ($self->{on_read}) {
…		…
791	&& !@{ $self->{_queue} } # and the queue is still empty	1195	&& !@{ $self->{_queue} } # and the queue is still empty
792	&& $self->{on_read} # but we still have on_read	1196	&& $self->{on_read} # but we still have on_read
793	) {	1197	) {
794	# no further data will arrive	1198	# no further data will arrive
795	# so no progress can be made	1199	# so no progress can be made
796	$self->_error (&Errno::EPIPE, 1), return	1200	$self->_error (Errno::EPIPE, 1), return
797	if $self->{_eof};	1201	if $self->{_eof};
798		1202
799	last; # more data might arrive	1203	last; # more data might arrive
800	}	1204	}
801	} else {	1205	} else {
…		…
804	last;	1208	last;
805	}	1209	}
806	}	1210	}
807		1211
808	if ($self->{_eof}) {	1212	if ($self->{_eof}) {
809	if ($self->{on_eof}) {	1213	$self->{on_eof}
810	$self->{on_eof}($self)	1214	? $self->{on_eof}($self)
811	} else {	1215	: $self->_error (0, 1, "Unexpected end-of-file");
812	$self->_error (0, 1);	1216
813	}	1217	return;
		1218	}
		1219
		1220	if (
		1221	defined $self->{rbuf_max}
		1222	&& $self->{rbuf_max} < length $self->{rbuf}
		1223	) {
		1224	$self->_error (Errno::ENOSPC, 1), return;
814	}	1225	}
815		1226
816	# may need to restart read watcher	1227	# may need to restart read watcher
817	unless ($self->{_rw}) {	1228	unless ($self->{_rw}) {
818	$self->start_read	1229	$self->start_read
…		…
830		1241
831	sub on_read {	1242	sub on_read {
832	my ($self, $cb) = @_;	1243	my ($self, $cb) = @_;
833		1244
834	$self->{on_read} = $cb;	1245	$self->{on_read} = $cb;
835	$self->_drain_rbuf if $cb && !$self->{_in_drain};	1246	$self->_drain_rbuf if $cb;
836	}	1247	}
837		1248
838	=item $handle->rbuf	1249	=item $handle->rbuf
839		1250
840	Returns the read buffer (as a modifiable lvalue).	1251	Returns the read buffer (as a modifiable lvalue).
841		1252
842	You can access the read buffer directly as the C<< ->{rbuf} >> member, if	1253	You can access the read buffer directly as the C<< ->{rbuf} >>
843	you want.	1254	member, if you want. However, the only operation allowed on the
		1255	read buffer (apart from looking at it) is removing data from its
		1256	beginning. Otherwise modifying or appending to it is not allowed and will
		1257	lead to hard-to-track-down bugs.
844		1258
845	NOTE: The read buffer should only be used or modified if the C<on_read>,	1259	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	1260	C<push_read> or C<unshift_read> methods are used. The other read methods
847	automatically manage the read buffer.	1261	automatically manage the read buffer.
848		1262
…		…
884	my $cb = pop;	1298	my $cb = pop;
885		1299
886	if (@_) {	1300	if (@_) {
887	my $type = shift;	1301	my $type = shift;
888		1302
		1303	$cb = ($RH{$type} ||= _load_func "$type\::anyevent_read_type"
889	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")	1304	or Carp::croak "unsupported/unloadable type '$type' passed to AnyEvent::Handle::push_read")
890	->($self, $cb, @_);	1305	->($self, $cb, @_);
891	}	1306	}
892		1307
893	push @{ $self->{_queue} }, $cb;	1308	push @{ $self->{_queue} }, $cb;
894	$self->_drain_rbuf unless $self->{_in_drain};	1309	$self->_drain_rbuf;
895	}	1310	}
896		1311
897	sub unshift_read {	1312	sub unshift_read {
898	my $self = shift;	1313	my $self = shift;
899	my $cb = pop;	1314	my $cb = pop;
…		…
903		1318
904	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read")	1319	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read")
905	->($self, $cb, @_);	1320	->($self, $cb, @_);
906	}	1321	}
907		1322
908
909	unshift @{ $self->{_queue} }, $cb;	1323	unshift @{ $self->{_queue} }, $cb;
910	$self->_drain_rbuf unless $self->{_in_drain};	1324	$self->_drain_rbuf;
911	}	1325	}
912		1326
913	=item $handle->push_read (type => @args, $cb)	1327	=item $handle->push_read (type => @args, $cb)
914		1328
915	=item $handle->unshift_read (type => @args, $cb)	1329	=item $handle->unshift_read (type => @args, $cb)
916		1330
917	Instead of providing a callback that parses the data itself you can chose	1331	Instead of providing a callback that parses the data itself you can chose
918	between a number of predefined parsing formats, for chunks of data, lines	1332	between a number of predefined parsing formats, for chunks of data, lines
919	etc.	1333	etc. You can also specify the (fully qualified) name of a package, in
		1334	which case AnyEvent tries to load the package and then expects to find the
		1335	C<anyevent_read_type> function inside (see "custom read types", below).
920		1336
921	Predefined types are (if you have ideas for additional types, feel free to	1337	Predefined types are (if you have ideas for additional types, feel free to
922	drop by and tell us):	1338	drop by and tell us):
923		1339
924	=over 4	1340	=over 4
…		…
1048	return 1;	1464	return 1;
1049	}	1465	}
1050		1466
1051	# reject	1467	# reject
1052	if ($reject && $$rbuf =~ $reject) {	1468	if ($reject && $$rbuf =~ $reject) {
1053	$self->_error (&Errno::EBADMSG);	1469	$self->_error (Errno::EBADMSG);
1054	}	1470	}
1055		1471
1056	# skip	1472	# skip
1057	if ($skip && $$rbuf =~ $skip) {	1473	if ($skip && $$rbuf =~ $skip) {
1058	$data .= substr $$rbuf, 0, $+[0], "";	1474	$data .= substr $$rbuf, 0, $+[0], "";
…		…
1074	my ($self, $cb) = @_;	1490	my ($self, $cb) = @_;
1075		1491
1076	sub {	1492	sub {
1077	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {	1493	unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) {
1078	if ($_[0]{rbuf} =~ /[^0-9]/) {	1494	if ($_[0]{rbuf} =~ /[^0-9]/) {
1079	$self->_error (&Errno::EBADMSG);	1495	$self->_error (Errno::EBADMSG);
1080	}	1496	}
1081	return;	1497	return;
1082	}	1498	}
1083		1499
1084	my $len = $1;	1500	my $len = $1;
…		…
1087	my $string = $_[1];	1503	my $string = $_[1];
1088	$_[0]->unshift_read (chunk => 1, sub {	1504	$_[0]->unshift_read (chunk => 1, sub {
1089	if ($_[1] eq ",") {	1505	if ($_[1] eq ",") {
1090	$cb->($_[0], $string);	1506	$cb->($_[0], $string);
1091	} else {	1507	} else {
1092	$self->_error (&Errno::EBADMSG);	1508	$self->_error (Errno::EBADMSG);
1093	}	1509	}
1094	});	1510	});
1095	});	1511	});
1096		1512
1097	1	1513	1
…		…
1103	An octet string prefixed with an encoded length. The encoding C<$format>	1519	An octet string prefixed with an encoded length. The encoding C<$format>
1104	uses the same format as a Perl C<pack> format, but must specify a single	1520	uses the same format as a Perl C<pack> format, but must specify a single
1105	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an	1521	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
1106	optional C<!>, C<< < >> or C<< > >> modifier).	1522	optional C<!>, C<< < >> or C<< > >> modifier).
1107		1523
1108	DNS over TCP uses a prefix of C<n>, EPP uses a prefix of C<N>.	1524	For example, DNS over TCP uses a prefix of C<n> (2 octet network order),
		1525	EPP uses a prefix of C<N> (4 octtes).
1109		1526
1110	Example: read a block of data prefixed by its length in BER-encoded	1527	Example: read a block of data prefixed by its length in BER-encoded
1111	format (very efficient).	1528	format (very efficient).
1112		1529
1113	$handle->push_read (packstring => "w", sub {	1530	$handle->push_read (packstring => "w", sub {
…		…
1143	}	1560	}
1144	};	1561	};
1145		1562
1146	=item json => $cb->($handle, $hash_or_arrayref)	1563	=item json => $cb->($handle, $hash_or_arrayref)
1147		1564
1148	Reads a JSON object or array, decodes it and passes it to the callback.	1565	Reads a JSON object or array, decodes it and passes it to the
		1566	callback. When a parse error occurs, an C<EBADMSG> error will be raised.
1149		1567
1150	If a C<json> object was passed to the constructor, then that will be used	1568	If a C<json> object was passed to the constructor, then that will be used
1151	for the final decode, otherwise it will create a JSON coder expecting UTF-8.	1569	for the final decode, otherwise it will create a JSON coder expecting UTF-8.
1152		1570
1153	This read type uses the incremental parser available with JSON version	1571	This read type uses the incremental parser available with JSON version
…		…
1162	=cut	1580	=cut
1163		1581
1164	register_read_type json => sub {	1582	register_read_type json => sub {
1165	my ($self, $cb) = @_;	1583	my ($self, $cb) = @_;
1166		1584
1167	require JSON;	1585	my $json = $self->{json} ||= json_coder;
1168		1586
1169	my $data;	1587	my $data;
1170	my $rbuf = \$self->{rbuf};	1588	my $rbuf = \$self->{rbuf};
1171		1589
1172	my $json = $self->{json} ||= JSON->new->utf8;
1173
1174	sub {	1590	sub {
1175	my $ref = $json->incr_parse ($self->{rbuf});	1591	my $ref = eval { $json->incr_parse ($self->{rbuf}) };
1176		1592
1177	if ($ref) {	1593	if ($ref) {
1178	$self->{rbuf} = $json->incr_text;	1594	$self->{rbuf} = $json->incr_text;
1179	$json->incr_text = "";	1595	$json->incr_text = "";
1180	$cb->($self, $ref);	1596	$cb->($self, $ref);
1181		1597
1182	1	1598	1
		1599	} elsif ($@) {
		1600	# error case
		1601	$json->incr_skip;
		1602
		1603	$self->{rbuf} = $json->incr_text;
		1604	$json->incr_text = "";
		1605
		1606	$self->_error (Errno::EBADMSG);
		1607
		1608	()
1183	} else {	1609	} else {
1184	$self->{rbuf} = "";	1610	$self->{rbuf} = "";
		1611
1185	()	1612	()
1186	}	1613	}
1187	}	1614	}
1188	};	1615	};
1189		1616
…		…
1221	# read remaining chunk	1648	# read remaining chunk
1222	$_[0]->unshift_read (chunk => $len, sub {	1649	$_[0]->unshift_read (chunk => $len, sub {
1223	if (my $ref = eval { Storable::thaw ($_[1]) }) {	1650	if (my $ref = eval { Storable::thaw ($_[1]) }) {
1224	$cb->($_[0], $ref);	1651	$cb->($_[0], $ref);
1225	} else {	1652	} else {
1226	$self->_error (&Errno::EBADMSG);	1653	$self->_error (Errno::EBADMSG);
1227	}	1654	}
1228	});	1655	});
1229	}	1656	}
1230		1657
1231	1	1658	1
1232	}	1659	}
1233	};	1660	};
1234		1661
1235	=back	1662	=back
1236		1663
1237	=item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args)	1664	=item custom read types - Package::anyevent_read_type $handle, $cb, @args
1238		1665
1239	This function (not method) lets you add your own types to C<push_read>.	1666	Instead of one of the predefined types, you can also specify the name
		1667	of a package. AnyEvent will try to load the package and then expects to
		1668	find a function named C<anyevent_read_type> inside. If it isn't found, it
		1669	progressively tries to load the parent package until it either finds the
		1670	function (good) or runs out of packages (bad).
1240		1671
1241	Whenever the given C<type> is used, C<push_read> will invoke the code	1672	Whenever this type is used, C<push_read> will invoke the function with the
1242	reference with the handle object, the callback and the remaining	1673	handle object, the original callback and the remaining arguments.
1243	arguments.
1244		1674
1245	The code reference is supposed to return a callback (usually a closure)	1675	The function is supposed to return a callback (usually a closure) that
1246	that works as a plain read callback (see C<< ->push_read ($cb) >>).	1676	works as a plain read callback (see C<< ->push_read ($cb) >>), so you can
		1677	mentally treat the function as a "configurable read type to read callback"
		1678	converter.
1247		1679
1248	It should invoke the passed callback when it is done reading (remember to	1680	It should invoke the original callback when it is done reading (remember
1249	pass C<$handle> as first argument as all other callbacks do that).	1681	to pass C<$handle> as first argument as all other callbacks do that,
		1682	although there is no strict requirement on this).
1250		1683
1251	Note that this is a function, and all types registered this way will be
1252	global, so try to use unique names.
1253
1254	For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>,	1684	For examples, see the source of this module (F<perldoc -m
1255	search for C<register_read_type>)).	1685	AnyEvent::Handle>, search for C<register_read_type>)).
1256		1686
1257	=item $handle->stop_read	1687	=item $handle->stop_read
1258		1688
1259	=item $handle->start_read	1689	=item $handle->start_read
1260		1690
…		…
1283	my ($self) = @_;	1713	my ($self) = @_;
1284		1714
1285	unless ($self->{_rw} || $self->{_eof}) {	1715	unless ($self->{_rw} || $self->{_eof}) {
1286	Scalar::Util::weaken $self;	1716	Scalar::Util::weaken $self;
1287		1717
1288	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1718	$self->{_rw} = AE::io $self->{fh}, 0, sub {
1289	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});	1719	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1290	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;	1720	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf;
1291		1721
1292	if ($len > 0) {	1722	if ($len > 0) {
1293	$self->{_activity} = AnyEvent->now;	1723	$self->{_activity} = $self->{_ractivity} = AE::now;
1294		1724
1295	if ($self->{tls}) {	1725	if ($self->{tls}) {
1296	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);	1726	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
		1727
1297	&_dotls ($self);	1728	&_dotls ($self);
1298	} else {	1729	} else {
1299	$self->_drain_rbuf unless $self->{_in_drain};	1730	$self->_drain_rbuf;
1300	}	1731	}
1301		1732
1302	} elsif (defined $len) {	1733	} elsif (defined $len) {
1303	delete $self->{_rw};	1734	delete $self->{_rw};
1304	$self->{_eof} = 1;	1735	$self->{_eof} = 1;
1305	$self->_drain_rbuf unless $self->{_in_drain};	1736	$self->_drain_rbuf;
1306		1737
1307	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	1738	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
1308	return $self->_error ($!, 1);	1739	return $self->_error ($!, 1);
1309	}	1740	}
1310	});	1741	};
1311	}	1742	}
1312	}	1743	}
1313		1744
		1745	our $ERROR_SYSCALL;
		1746	our $ERROR_WANT_READ;
		1747
		1748	sub _tls_error {
		1749	my ($self, $err) = @_;
		1750
		1751	return $self->_error ($!, 1)
		1752	if $err == Net::SSLeay::ERROR_SYSCALL ();
		1753
		1754	my $err =Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ());
		1755
		1756	# reduce error string to look less scary
		1757	$err =~ s/^error:[0-9a-fA-F]{8}:[^:]+:([^:]+):/\L$1: /;
		1758
		1759	if ($self->{_on_starttls}) {
		1760	(delete $self->{_on_starttls})->($self, undef, $err);
		1761	&_freetls;
		1762	} else {
		1763	&_freetls;
		1764	$self->_error (Errno::EPROTO, 1, $err);
		1765	}
		1766	}
		1767
		1768	# poll the write BIO and send the data if applicable
		1769	# also decode read data if possible
		1770	# this is basiclaly our TLS state machine
		1771	# more efficient implementations are possible with openssl,
		1772	# but not with the buggy and incomplete Net::SSLeay.
1314	sub _dotls {	1773	sub _dotls {
1315	my ($self) = @_;	1774	my ($self) = @_;
1316		1775
1317	my $buf;	1776	my $tmp;
1318		1777
1319	if (length $self->{_tls_wbuf}) {	1778	if (length $self->{_tls_wbuf}) {
1320	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1779	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1321	substr $self->{_tls_wbuf}, 0, $len, "";	1780	substr $self->{_tls_wbuf}, 0, $tmp, "";
1322	}	1781	}
1323	}
1324		1782
		1783	$tmp = Net::SSLeay::get_error ($self->{tls}, $tmp);
		1784	return $self->_tls_error ($tmp)
		1785	if $tmp != $ERROR_WANT_READ
		1786	&& ($tmp != $ERROR_SYSCALL || $!);
		1787	}
		1788
1325	while (defined ($buf = Net::SSLeay::read ($self->{tls}))) {	1789	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
1326	unless (length $buf) {	1790	unless (length $tmp) {
1327	# let's treat SSL-eof as we treat normal EOF	1791	$self->{_on_starttls}
1328	delete $self->{_rw};	1792	and (delete $self->{_on_starttls})->($self, undef, "EOF during handshake"); # ???
1329	$self->{_eof} = 1;
1330	&_freetls;	1793	&_freetls;
		1794
		1795	if ($self->{on_stoptls}) {
		1796	$self->{on_stoptls}($self);
		1797	return;
		1798	} else {
		1799	# let's treat SSL-eof as we treat normal EOF
		1800	delete $self->{_rw};
		1801	$self->{_eof} = 1;
		1802	}
1331	}	1803	}
1332		1804
1333	$self->{rbuf} .= $buf;	1805	$self->{_tls_rbuf} .= $tmp;
1334	$self->_drain_rbuf unless $self->{_in_drain};	1806	$self->_drain_rbuf;
1335	$self->{tls} or return; # tls session might have gone away in callback	1807	$self->{tls} or return; # tls session might have gone away in callback
1336	}	1808	}
1337		1809
1338	my $err = Net::SSLeay::get_error ($self->{tls}, -1);	1810	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
1339
1340	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {
1341	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {
1342	return $self->_error ($!, 1);	1811	return $self->_tls_error ($tmp)
1343	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {	1812	if $tmp != $ERROR_WANT_READ
1344	return $self->_error (&Errno::EIO, 1);	1813	&& ($tmp != $ERROR_SYSCALL || $!);
1345	}
1346		1814
1347	# all others are fine for our purposes
1348	}
1349
1350	if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {	1815	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1351	$self->{wbuf} .= $buf;	1816	$self->{wbuf} .= $tmp;
1352	$self->_drain_wbuf;	1817	$self->_drain_wbuf;
1353	}	1818	}
		1819
		1820	$self->{_on_starttls}
		1821	and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK ()
		1822	and (delete $self->{_on_starttls})->($self, 1, "TLS/SSL connection established");
1354	}	1823	}
1355		1824
1356	=item $handle->starttls ($tls[, $tls_ctx])	1825	=item $handle->starttls ($tls[, $tls_ctx])
1357		1826
1358	Instead of starting TLS negotiation immediately when the AnyEvent::Handle	1827	Instead of starting TLS negotiation immediately when the AnyEvent::Handle
1359	object is created, you can also do that at a later time by calling	1828	object is created, you can also do that at a later time by calling
1360	C<starttls>.	1829	C<starttls>.
1361		1830
		1831	Starting TLS is currently an asynchronous operation - when you push some
		1832	write data and then call C<< ->starttls >> then TLS negotiation will start
		1833	immediately, after which the queued write data is then sent.
		1834
1362	The first argument is the same as the C<tls> constructor argument (either	1835	The first argument is the same as the C<tls> constructor argument (either
1363	C<"connect">, C<"accept"> or an existing Net::SSLeay object).	1836	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
1364		1837
1365	The second argument is the optional C<Net::SSLeay::CTX> object that is	1838	The second argument is the optional C<AnyEvent::TLS> object that is used
1366	used when AnyEvent::Handle has to create its own TLS connection object.	1839	when AnyEvent::Handle has to create its own TLS connection object, or
		1840	a hash reference with C<< key => value >> pairs that will be used to
		1841	construct a new context.
1367		1842
1368	The TLS connection object will end up in C<< $handle->{tls} >> after this	1843	The TLS connection object will end up in C<< $handle->{tls} >>, the TLS
1369	call and can be used or changed to your liking. Note that the handshake	1844	context in C<< $handle->{tls_ctx} >> after this call and can be used or
1370	might have already started when this function returns.	1845	changed to your liking. Note that the handshake might have already started
		1846	when this function returns.
1371		1847
1372	If it an error to start a TLS handshake more than once per	1848	Due to bugs in OpenSSL, it might or might not be possible to do multiple
1373	AnyEvent::Handle object (this is due to bugs in OpenSSL).	1849	handshakes on the same stream. Best do not attempt to use the stream after
		1850	stopping TLS.
1374		1851
1375	=cut	1852	=cut
		1853
		1854	our %TLS_CACHE; #TODO not yet documented, should we?
1376		1855
1377	sub starttls {	1856	sub starttls {
1378	my ($self, $ssl, $ctx) = @_;	1857	my ($self, $tls, $ctx) = @_;
1379		1858
1380	Carp::croak "it is an error to call starttls more than once on an Anyevent::Handle object"	1859	Carp::croak "It is an error to call starttls on an AnyEvent::Handle object while TLS is already active, caught"
1381	if $self->{tls};	1860	if $self->{tls};
		1861
		1862	$self->{tls} = $tls;
		1863	$self->{tls_ctx} = $ctx if @_ > 2;
		1864
		1865	return unless $self->{fh};
		1866
		1867	require Net::SSLeay;
		1868
		1869	$ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL ();
		1870	$ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ ();
		1871
		1872	$tls = delete $self->{tls};
		1873	$ctx = $self->{tls_ctx};
		1874
		1875	local $Carp::CarpLevel = 1; # skip ourselves when creating a new context or session
		1876
		1877	if ("HASH" eq ref $ctx) {
		1878	require AnyEvent::TLS;
		1879
		1880	if ($ctx->{cache}) {
		1881	my $key = $ctx+0;
		1882	$ctx = $TLS_CACHE{$key} ||= new AnyEvent::TLS %$ctx;
		1883	} else {
		1884	$ctx = new AnyEvent::TLS %$ctx;
		1885	}
		1886	}
1382		1887
1383	if ($ssl eq "accept") {	1888	$self->{tls_ctx} = $ctx || TLS_CTX ();
1384	$ssl = Net::SSLeay::new ($ctx || TLS_CTX ());	1889	$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} = $ssl;
1392		1890
1393	# basically, this is deep magic (because SSL_read should have the same issues)	1891	# basically, this is deep magic (because SSL_read should have the same issues)
1394	# but the openssl maintainers basically said: "trust us, it just works".	1892	# but the openssl maintainers basically said: "trust us, it just works".
1395	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1893	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
1396	# and mismaintained ssleay-module doesn't even offer them).	1894	# and mismaintained ssleay-module doesn't even offer them).
…		…
1400	#	1898	#
1401	# note that we do not try to keep the length constant between writes as we are required to do.	1899	# note that we do not try to keep the length constant between writes as we are required to do.
1402	# we assume that most (but not all) of this insanity only applies to non-blocking cases,	1900	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
1403	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to	1901	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
1404	# have identity issues in that area.	1902	# have identity issues in that area.
1405	Net::SSLeay::CTX_set_mode ($self->{tls},	1903	# Net::SSLeay::CTX_set_mode ($ssl,
1406	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)	1904	# (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1)
1407	| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));	1905	# | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2));
		1906	Net::SSLeay::CTX_set_mode ($tls, 1|2);
1408		1907
1409	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1908	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1410	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1909	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1411		1910
		1911	Net::SSLeay::BIO_write ($self->{_rbio}, delete $self->{rbuf});
		1912
1412	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	1913	Net::SSLeay::set_bio ($tls, $self->{_rbio}, $self->{_wbio});
		1914
		1915	$self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) }
		1916	if $self->{on_starttls};
1413		1917
1414	&_dotls; # need to trigger the initial handshake	1918	&_dotls; # need to trigger the initial handshake
1415	$self->start_read; # make sure we actually do read	1919	$self->start_read; # make sure we actually do read
1416	}	1920	}
1417		1921
1418	=item $handle->stoptls	1922	=item $handle->stoptls
1419		1923
1420	Shuts down the SSL connection - this makes a proper EOF handshake by	1924	Shuts down the SSL connection - this makes a proper EOF handshake by
1421	sending a close notify to the other side, but since OpenSSL doesn't	1925	sending a close notify to the other side, but since OpenSSL doesn't
1422	support non-blocking shut downs, it is not possible to re-use the stream	1926	support non-blocking shut downs, it is not guarenteed that you can re-use
1423	afterwards.	1927	the stream afterwards.
1424		1928
1425	=cut	1929	=cut
1426		1930
1427	sub stoptls {	1931	sub stoptls {
1428	my ($self) = @_;	1932	my ($self) = @_;
1429		1933
1430	if ($self->{tls}) {	1934	if ($self->{tls}) {
1431	Net::SSLeay::shutdown $self->{tls};	1935	Net::SSLeay::shutdown ($self->{tls});
1432		1936
1433	&_dotls;	1937	&_dotls;
1434		1938
1435	# we don't give a shit. no, we do, but we can't. no...	1939	# # we don't give a shit. no, we do, but we can't. no...#d#
1436	# we, we... have to use openssl :/	1940	# # we, we... have to use openssl :/#d#
1437	&_freetls;	1941	# &_freetls;#d#
1438	}	1942	}
1439	}	1943	}
1440		1944
1441	sub _freetls {	1945	sub _freetls {
1442	my ($self) = @_;	1946	my ($self) = @_;
1443		1947
1444	return unless $self->{tls};	1948	return unless $self->{tls};
1445		1949
1446	Net::SSLeay::free (delete $self->{tls});	1950	$self->{tls_ctx}->_put_session (delete $self->{tls})
		1951	if $self->{tls} > 0;
1447		1952
1448	delete @$self{qw(_rbio _wbio _tls_wbuf)};	1953	delete @$self{qw(_rbio _wbio _tls_wbuf _on_starttls)};
1449	}	1954	}
1450		1955
1451	sub DESTROY {	1956	sub DESTROY {
1452	my $self = shift;	1957	my ($self) = @_;
1453		1958
1454	&_freetls;	1959	&_freetls;
1455		1960
1456	my $linger = exists $self->{linger} ? $self->{linger} : 3600;	1961	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
1457		1962
1458	if ($linger && length $self->{wbuf}) {	1963	if ($linger && length $self->{wbuf} && $self->{fh}) {
1459	my $fh = delete $self->{fh};	1964	my $fh = delete $self->{fh};
1460	my $wbuf = delete $self->{wbuf};	1965	my $wbuf = delete $self->{wbuf};
1461		1966
1462	my @linger;	1967	my @linger;
1463		1968
1464	push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub {	1969	push @linger, AE::io $fh, 1, sub {
1465	my $len = syswrite $fh, $wbuf, length $wbuf;	1970	my $len = syswrite $fh, $wbuf, length $wbuf;
1466		1971
1467	if ($len > 0) {	1972	if ($len > 0) {
1468	substr $wbuf, 0, $len, "";	1973	substr $wbuf, 0, $len, "";
1469	} else {	1974	} else {
1470	@linger = (); # end	1975	@linger = (); # end
1471	}	1976	}
1472	});	1977	};
1473	push @linger, AnyEvent->timer (after => $linger, cb => sub {	1978	push @linger, AE::timer $linger, 0, sub {
1474	@linger = ();	1979	@linger = ();
1475	});	1980	};
1476	}	1981	}
		1982	}
		1983
		1984	=item $handle->destroy
		1985
		1986	Shuts down the handle object as much as possible - this call ensures that
		1987	no further callbacks will be invoked and as many resources as possible
		1988	will be freed. Any method you will call on the handle object after
		1989	destroying it in this way will be silently ignored (and it will return the
		1990	empty list).
		1991
		1992	Normally, you can just "forget" any references to an AnyEvent::Handle
		1993	object and it will simply shut down. This works in fatal error and EOF
		1994	callbacks, as well as code outside. It does I<NOT> work in a read or write
		1995	callback, so when you want to destroy the AnyEvent::Handle object from
		1996	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
		1997	that case.
		1998
		1999	Destroying the handle object in this way has the advantage that callbacks
		2000	will be removed as well, so if those are the only reference holders (as
		2001	is common), then one doesn't need to do anything special to break any
		2002	reference cycles.
		2003
		2004	The handle might still linger in the background and write out remaining
		2005	data, as specified by the C<linger> option, however.
		2006
		2007	=cut
		2008
		2009	sub destroy {
		2010	my ($self) = @_;
		2011
		2012	$self->DESTROY;
		2013	%$self = ();
		2014	bless $self, "AnyEvent::Handle::destroyed";
		2015	}
		2016
		2017	sub AnyEvent::Handle::destroyed::AUTOLOAD {
		2018	#nop
1477	}	2019	}
1478		2020
1479	=item AnyEvent::Handle::TLS_CTX	2021	=item AnyEvent::Handle::TLS_CTX
1480		2022
1481	This function creates and returns the Net::SSLeay::CTX object used by	2023	This function creates and returns the AnyEvent::TLS object used by default
1482	default for TLS mode.	2024	for TLS mode.
1483		2025
1484	The context is created like this:	2026	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		2027
1494	=cut	2028	=cut
1495		2029
1496	our $TLS_CTX;	2030	our $TLS_CTX;
1497		2031
1498	sub TLS_CTX() {	2032	sub TLS_CTX() {
1499	$TLS_CTX || do {	2033	$TLS_CTX ||= do {
1500	require Net::SSLeay;	2034	require AnyEvent::TLS;
1501		2035
1502	Net::SSLeay::load_error_strings ();	2036	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	$TLS_CTX
1511	}	2037	}
1512	}	2038	}
1513		2039
1514	=back	2040	=back
		2041
		2042
		2043	=head1 NONFREQUENTLY ASKED QUESTIONS
		2044
		2045	=over 4
		2046
		2047	=item I C<undef> the AnyEvent::Handle reference inside my callback and
		2048	still get further invocations!
		2049
		2050	That's because AnyEvent::Handle keeps a reference to itself when handling
		2051	read or write callbacks.
		2052
		2053	It is only safe to "forget" the reference inside EOF or error callbacks,
		2054	from within all other callbacks, you need to explicitly call the C<<
		2055	->destroy >> method.
		2056
		2057	=item I get different callback invocations in TLS mode/Why can't I pause
		2058	reading?
		2059
		2060	Unlike, say, TCP, TLS connections do not consist of two independent
		2061	communication channels, one for each direction. Or put differently. The
		2062	read and write directions are not independent of each other: you cannot
		2063	write data unless you are also prepared to read, and vice versa.
		2064
		2065	This can mean than, in TLS mode, you might get C<on_error> or C<on_eof>
		2066	callback invocations when you are not expecting any read data - the reason
		2067	is that AnyEvent::Handle always reads in TLS mode.
		2068
		2069	During the connection, you have to make sure that you always have a
		2070	non-empty read-queue, or an C<on_read> watcher. At the end of the
		2071	connection (or when you no longer want to use it) you can call the
		2072	C<destroy> method.
		2073
		2074	=item How do I read data until the other side closes the connection?
		2075
		2076	If you just want to read your data into a perl scalar, the easiest way
		2077	to achieve this is by setting an C<on_read> callback that does nothing,
		2078	clearing the C<on_eof> callback and in the C<on_error> callback, the data
		2079	will be in C<$_[0]{rbuf}>:
		2080
		2081	$handle->on_read (sub { });
		2082	$handle->on_eof (undef);
		2083	$handle->on_error (sub {
		2084	my $data = delete $_[0]{rbuf};
		2085	});
		2086
		2087	The reason to use C<on_error> is that TCP connections, due to latencies
		2088	and packets loss, might get closed quite violently with an error, when in
		2089	fact, all data has been received.
		2090
		2091	It is usually better to use acknowledgements when transferring data,
		2092	to make sure the other side hasn't just died and you got the data
		2093	intact. This is also one reason why so many internet protocols have an
		2094	explicit QUIT command.
		2095
		2096	=item I don't want to destroy the handle too early - how do I wait until
		2097	all data has been written?
		2098
		2099	After writing your last bits of data, set the C<on_drain> callback
		2100	and destroy the handle in there - with the default setting of
		2101	C<low_water_mark> this will be called precisely when all data has been
		2102	written to the socket:
		2103
		2104	$handle->push_write (...);
		2105	$handle->on_drain (sub {
		2106	warn "all data submitted to the kernel\n";
		2107	undef $handle;
		2108	});
		2109
		2110	If you just want to queue some data and then signal EOF to the other side,
		2111	consider using C<< ->push_shutdown >> instead.
		2112
		2113	=item I want to contact a TLS/SSL server, I don't care about security.
		2114
		2115	If your TLS server is a pure TLS server (e.g. HTTPS) that only speaks TLS,
		2116	simply connect to it and then create the AnyEvent::Handle with the C<tls>
		2117	parameter:
		2118
		2119	tcp_connect $host, $port, sub {
		2120	my ($fh) = @_;
		2121
		2122	my $handle = new AnyEvent::Handle
		2123	fh => $fh,
		2124	tls => "connect",
		2125	on_error => sub { ... };
		2126
		2127	$handle->push_write (...);
		2128	};
		2129
		2130	=item I want to contact a TLS/SSL server, I do care about security.
		2131
		2132	Then you should additionally enable certificate verification, including
		2133	peername verification, if the protocol you use supports it (see
		2134	L<AnyEvent::TLS>, C<verify_peername>).
		2135
		2136	E.g. for HTTPS:
		2137
		2138	tcp_connect $host, $port, sub {
		2139	my ($fh) = @_;
		2140
		2141	my $handle = new AnyEvent::Handle
		2142	fh => $fh,
		2143	peername => $host,
		2144	tls => "connect",
		2145	tls_ctx => { verify => 1, verify_peername => "https" },
		2146	...
		2147
		2148	Note that you must specify the hostname you connected to (or whatever
		2149	"peername" the protocol needs) as the C<peername> argument, otherwise no
		2150	peername verification will be done.
		2151
		2152	The above will use the system-dependent default set of trusted CA
		2153	certificates. If you want to check against a specific CA, add the
		2154	C<ca_file> (or C<ca_cert>) arguments to C<tls_ctx>:
		2155
		2156	tls_ctx => {
		2157	verify => 1,
		2158	verify_peername => "https",
		2159	ca_file => "my-ca-cert.pem",
		2160	},
		2161
		2162	=item I want to create a TLS/SSL server, how do I do that?
		2163
		2164	Well, you first need to get a server certificate and key. You have
		2165	three options: a) ask a CA (buy one, use cacert.org etc.) b) create a
		2166	self-signed certificate (cheap. check the search engine of your choice,
		2167	there are many tutorials on the net) or c) make your own CA (tinyca2 is a
		2168	nice program for that purpose).
		2169
		2170	Then create a file with your private key (in PEM format, see
		2171	L<AnyEvent::TLS>), followed by the certificate (also in PEM format). The
		2172	file should then look like this:
		2173
		2174	-----BEGIN RSA PRIVATE KEY-----
		2175	...header data
		2176	... lots of base64'y-stuff
		2177	-----END RSA PRIVATE KEY-----
		2178
		2179	-----BEGIN CERTIFICATE-----
		2180	... lots of base64'y-stuff
		2181	-----END CERTIFICATE-----
		2182
		2183	The important bits are the "PRIVATE KEY" and "CERTIFICATE" parts. Then
		2184	specify this file as C<cert_file>:
		2185
		2186	tcp_server undef, $port, sub {
		2187	my ($fh) = @_;
		2188
		2189	my $handle = new AnyEvent::Handle
		2190	fh => $fh,
		2191	tls => "accept",
		2192	tls_ctx => { cert_file => "my-server-keycert.pem" },
		2193	...
		2194
		2195	When you have intermediate CA certificates that your clients might not
		2196	know about, just append them to the C<cert_file>.
		2197
		2198	=back
		2199
1515		2200
1516	=head1 SUBCLASSING AnyEvent::Handle	2201	=head1 SUBCLASSING AnyEvent::Handle
1517		2202
1518	In many cases, you might want to subclass AnyEvent::Handle.	2203	In many cases, you might want to subclass AnyEvent::Handle.
1519		2204

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