[ViewVC] Diff of: cvs/AnyEvent/lib/AnyEvent/Handle.pm

Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.29 by root, Sat May 24 23:10:18 2008 UTC vs.
Revision 1.47 by root, Thu May 29 00:25:28 2008 UTC

…		…
2		2
3	no warnings;	3	no warnings;
4	use strict;	4	use strict;
5		5
6	use AnyEvent ();	6	use AnyEvent ();
7	use AnyEvent::Util ();	7	use AnyEvent::Util qw(WSAEWOULDBLOCK);
8	use Scalar::Util ();	8	use Scalar::Util ();
9	use Carp ();	9	use Carp ();
10	use Fcntl ();	10	use Fcntl ();
11	use Errno qw/EAGAIN EINTR/;	11	use Errno qw(EAGAIN EINTR);
12		12
13	=head1 NAME	13	=head1 NAME
14		14
15	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent	15	AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent
16
17	This module is experimental.
18		16
19	=cut	17	=cut
20		18
21	our $VERSION = '0.04';	19	our $VERSION = '0.04';
22		20
…		…
25	use AnyEvent;	23	use AnyEvent;
26	use AnyEvent::Handle;	24	use AnyEvent::Handle;
27		25
28	my $cv = AnyEvent->condvar;	26	my $cv = AnyEvent->condvar;
29		27
30	my $ae_fh = AnyEvent::Handle->new (fh => \*STDIN);	28	my $handle =
31
32	#TODO
33
34	# or use the constructor to pass the callback:
35
36	my $ae_fh2 =
37	AnyEvent::Handle->new (	29	AnyEvent::Handle->new (
38	fh => \*STDIN,	30	fh => \*STDIN,
39	on_eof => sub {	31	on_eof => sub {
40	$cv->broadcast;	32	$cv->broadcast;
41	},	33	},
42	#TODO
43	);	34	);
44		35
45	$cv->wait;	36	# send some request line
		37	$handle->push_write ("getinfo\015\012");
		38
		39	# read the response line
		40	$handle->push_read (line => sub {
		41	my ($handle, $line) = @_;
		42	warn "read line <$line>\n";
		43	$cv->send;
		44	});
		45
		46	$cv->recv;
46		47
47	=head1 DESCRIPTION	48	=head1 DESCRIPTION
48		49
49	This module is a helper module to make it easier to do event-based I/O on	50	This module is a helper module to make it easier to do event-based I/O on
50	filehandles. For utility functions for doing non-blocking connects and accepts	51	filehandles. For utility functions for doing non-blocking connects and accepts
…		…
72	The filehandle this L<AnyEvent::Handle> object will operate on.	73	The filehandle this L<AnyEvent::Handle> object will operate on.
73		74
74	NOTE: The filehandle will be set to non-blocking (using	75	NOTE: The filehandle will be set to non-blocking (using
75	AnyEvent::Util::fh_nonblocking).	76	AnyEvent::Util::fh_nonblocking).
76		77
77	=item on_eof => $cb->($self)	78	=item on_eof => $cb->($handle)
78		79
79	Set the callback to be called on EOF.	80	Set the callback to be called on EOF.
80		81
81	While not mandatory, it is highly recommended to set an eof callback,	82	While not mandatory, it is highly recommended to set an eof callback,
82	otherwise you might end up with a closed socket while you are still	83	otherwise you might end up with a closed socket while you are still
83	waiting for data.	84	waiting for data.
84		85
85	=item on_error => $cb->($self)	86	=item on_error => $cb->($handle)
86		87
87	This is the fatal error callback, that is called when, well, a fatal error	88	This is the fatal error callback, that is called when, well, a fatal error
88	occurs, such as not being able to resolve the hostname, failure to connect	89	occurs, such as not being able to resolve the hostname, failure to connect
89	or a read error.	90	or a read error.
90		91
91	The object will not be in a usable state when this callback has been	92	The object will not be in a usable state when this callback has been
92	called.	93	called.
93		94
94	On callback entrance, the value of C<$!> contains the operating system	95	On callback entrance, the value of C<$!> contains the operating system
95	error (or C<ENOSPC>, C<EPIPE> or C<EBADMSG>).	96	error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>).
		97
		98	The callback should throw an exception. If it returns, then
		99	AnyEvent::Handle will C<croak> for you.
96		100
97	While not mandatory, it is I<highly> recommended to set this callback, as	101	While not mandatory, it is I<highly> recommended to set this callback, as
98	you will not be notified of errors otherwise. The default simply calls	102	you will not be notified of errors otherwise. The default simply calls
99	die.	103	die.
100		104
101	=item on_read => $cb->($self)	105	=item on_read => $cb->($handle)
102		106
103	This sets the default read callback, which is called when data arrives	107	This sets the default read callback, which is called when data arrives
104	and no read request is in the queue.	108	and no read request is in the queue.
105		109
106	To access (and remove data from) the read buffer, use the C<< ->rbuf >>	110	To access (and remove data from) the read buffer, use the C<< ->rbuf >>
107	method or access the C<$self->{rbuf}> member directly.	111	method or access the C<$handle->{rbuf}> member directly.
108		112
109	When an EOF condition is detected then AnyEvent::Handle will first try to	113	When an EOF condition is detected then AnyEvent::Handle will first try to
110	feed all the remaining data to the queued callbacks and C<on_read> before	114	feed all the remaining data to the queued callbacks and C<on_read> before
111	calling the C<on_eof> callback. If no progress can be made, then a fatal	115	calling the C<on_eof> callback. If no progress can be made, then a fatal
112	error will be raised (with C<$!> set to C<EPIPE>).	116	error will be raised (with C<$!> set to C<EPIPE>).
113		117
114	=item on_drain => $cb->()	118	=item on_drain => $cb->($handle)
115		119
116	This sets the callback that is called when the write buffer becomes empty	120	This sets the callback that is called when the write buffer becomes empty
117	(or when the callback is set and the buffer is empty already).	121	(or when the callback is set and the buffer is empty already).
118		122
119	To append to the write buffer, use the C<< ->push_write >> method.	123	To append to the write buffer, use the C<< ->push_write >> method.
		124
		125	=item timeout => $fractional_seconds
		126
		127	If non-zero, then this enables an "inactivity" timeout: whenever this many
		128	seconds pass without a successful read or write on the underlying file
		129	handle, the C<on_timeout> callback will be invoked (and if that one is
		130	missing, an C<ETIMEDOUT> error will be raised).
		131
		132	Note that timeout processing is also active when you currently do not have
		133	any outstanding read or write requests: If you plan to keep the connection
		134	idle then you should disable the timout temporarily or ignore the timeout
		135	in the C<on_timeout> callback.
		136
		137	Zero (the default) disables this timeout.
		138
		139	=item on_timeout => $cb->($handle)
		140
		141	Called whenever the inactivity timeout passes. If you return from this
		142	callback, then the timeout will be reset as if some activity had happened,
		143	so this condition is not fatal in any way.
120		144
121	=item rbuf_max => <bytes>	145	=item rbuf_max => <bytes>
122		146
123	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)	147	If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>)
124	when the read buffer ever (strictly) exceeds this size. This is useful to	148	when the read buffer ever (strictly) exceeds this size. This is useful to
…		…
131	isn't finished).	155	isn't finished).
132		156
133	=item read_size => <bytes>	157	=item read_size => <bytes>
134		158
135	The default read block size (the amount of bytes this module will try to read	159	The default read block size (the amount of bytes this module will try to read
136	on each [loop iteration). Default: C<4096>.	160	during each (loop iteration). Default: C<8192>.
137		161
138	=item low_water_mark => <bytes>	162	=item low_water_mark => <bytes>
139		163
140	Sets the amount of bytes (default: C<0>) that make up an "empty" write	164	Sets the amount of bytes (default: C<0>) that make up an "empty" write
141	buffer: If the write reaches this size or gets even samller it is	165	buffer: If the write reaches this size or gets even samller it is
…		…
164		188
165	Use the given Net::SSLeay::CTX object to create the new TLS connection	189	Use the given Net::SSLeay::CTX object to create the new TLS connection
166	(unless a connection object was specified directly). If this parameter is	190	(unless a connection object was specified directly). If this parameter is
167	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.	191	missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>.
168		192
		193	=item json => JSON or JSON::XS object
		194
		195	This is the json coder object used by the C<json> read and write types.
		196
		197	If you don't supply it, then AnyEvent::Handle will create and use a
		198	suitable one, which will write and expect UTF-8 encoded JSON texts.
		199
		200	Note that you are responsible to depend on the JSON module if you want to
		201	use this functionality, as AnyEvent does not have a dependency itself.
		202
		203	=item filter_r => $cb
		204
		205	=item filter_w => $cb
		206
		207	These exist, but are undocumented at this time.
		208
169	=back	209	=back
170		210
171	=cut	211	=cut
172
173	our (%RH, %WH);
174
175	sub register_read_type($$) {
176	$RH{$_[0]} = $_[1];
177	}
178
179	sub register_write_type($$) {
180	$WH{$_[0]} = $_[1];
181	}
182		212
183	sub new {	213	sub new {
184	my $class = shift;	214	my $class = shift;
185		215
186	my $self = bless { @_ }, $class;	216	my $self = bless { @_ }, $class;
…		…
192	if ($self->{tls}) {	222	if ($self->{tls}) {
193	require Net::SSLeay;	223	require Net::SSLeay;
194	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});	224	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});
195	}	225	}
196		226
197	$self->on_eof (delete $self->{on_eof} ) if $self->{on_eof};	227	# $self->on_eof (delete $self->{on_eof} ) if $self->{on_eof}; # nop
198	$self->on_error (delete $self->{on_error}) if $self->{on_error};	228	# $self->on_error (delete $self->{on_error}) if $self->{on_error}; # nop
		229	# $self->on_read (delete $self->{on_read} ) if $self->{on_read}; # nop
199	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};	230	$self->on_drain (delete $self->{on_drain}) if $self->{on_drain};
200	$self->on_read (delete $self->{on_read} ) if $self->{on_read};	231
		232	$self->{_activity} = AnyEvent->now;
		233	$self->_timeout;
201		234
202	$self->start_read;	235	$self->start_read;
203		236
204	$self	237	$self
205	}	238	}
206		239
207	sub _shutdown {	240	sub _shutdown {
208	my ($self) = @_;	241	my ($self) = @_;
209		242
		243	delete $self->{_tw};
210	delete $self->{rw};	244	delete $self->{_rw};
211	delete $self->{ww};	245	delete $self->{_ww};
212	delete $self->{fh};	246	delete $self->{fh};
213	}	247	}
214		248
215	sub error {	249	sub error {
216	my ($self) = @_;	250	my ($self) = @_;
…		…
218	{	252	{
219	local $!;	253	local $!;
220	$self->_shutdown;	254	$self->_shutdown;
221	}	255	}
222		256
223	if ($self->{on_error}) {
224	$self->{on_error}($self);	257	$self->{on_error}($self)
225	} else {	258	if $self->{on_error};
		259
226	Carp::croak "AnyEvent::Handle uncaught fatal error: $!";	260	Carp::croak "AnyEvent::Handle uncaught fatal error: $!";
227	}
228	}	261	}
229		262
230	=item $fh = $handle->fh	263	=item $fh = $handle->fh
231		264
232	This method returns the file handle of the L<AnyEvent::Handle> object.	265	This method returns the file handle of the L<AnyEvent::Handle> object.
233		266
234	=cut	267	=cut
235		268
236	sub fh { $_[0]->{fh} }	269	sub fh { $_[0]{fh} }
237		270
238	=item $handle->on_error ($cb)	271	=item $handle->on_error ($cb)
239		272
240	Replace the current C<on_error> callback (see the C<on_error> constructor argument).	273	Replace the current C<on_error> callback (see the C<on_error> constructor argument).
241		274
…		…
251		284
252	=cut	285	=cut
253		286
254	sub on_eof {	287	sub on_eof {
255	$_[0]{on_eof} = $_[1];	288	$_[0]{on_eof} = $_[1];
		289	}
		290
		291	=item $handle->on_timeout ($cb)
		292
		293	Replace the current C<on_timeout> callback, or disables the callback
		294	(but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor
		295	argument.
		296
		297	=cut
		298
		299	sub on_timeout {
		300	$_[0]{on_timeout} = $_[1];
		301	}
		302
		303	#############################################################################
		304
		305	=item $handle->timeout ($seconds)
		306
		307	Configures (or disables) the inactivity timeout.
		308
		309	=cut
		310
		311	sub timeout {
		312	my ($self, $timeout) = @_;
		313
		314	$self->{timeout} = $timeout;
		315	$self->_timeout;
		316	}
		317
		318	# reset the timeout watcher, as neccessary
		319	# also check for time-outs
		320	sub _timeout {
		321	my ($self) = @_;
		322
		323	if ($self->{timeout}) {
		324	my $NOW = AnyEvent->now;
		325
		326	# when would the timeout trigger?
		327	my $after = $self->{_activity} + $self->{timeout} - $NOW;
		328
		329	# now or in the past already?
		330	if ($after <= 0) {
		331	$self->{_activity} = $NOW;
		332
		333	if ($self->{on_timeout}) {
		334	$self->{on_timeout}->($self);
		335	} else {
		336	$! = Errno::ETIMEDOUT;
		337	$self->error;
		338	}
		339
		340	# callbakx could have changed timeout value, optimise
		341	return unless $self->{timeout};
		342
		343	# calculate new after
		344	$after = $self->{timeout};
		345	}
		346
		347	Scalar::Util::weaken $self;
		348
		349	$self->{_tw} \|\|= AnyEvent->timer (after => $after, cb => sub {
		350	delete $self->{_tw};
		351	$self->_timeout;
		352	});
		353	} else {
		354	delete $self->{_tw};
		355	}
256	}	356	}
257		357
258	#############################################################################	358	#############################################################################
259		359
260	=back	360	=back
…		…
297	=cut	397	=cut
298		398
299	sub _drain_wbuf {	399	sub _drain_wbuf {
300	my ($self) = @_;	400	my ($self) = @_;
301		401
302	if (!$self->{ww} && length $self->{wbuf}) {	402	if (!$self->{_ww} && length $self->{wbuf}) {
		403
303	Scalar::Util::weaken $self;	404	Scalar::Util::weaken $self;
		405
304	my $cb = sub {	406	my $cb = sub {
305	my $len = syswrite $self->{fh}, $self->{wbuf};	407	my $len = syswrite $self->{fh}, $self->{wbuf};
306		408
307	if ($len >= 0) {	409	if ($len >= 0) {
308	substr $self->{wbuf}, 0, $len, "";	410	substr $self->{wbuf}, 0, $len, "";
		411
		412	$self->{_activity} = AnyEvent->now;
309		413
310	$self->{on_drain}($self)	414	$self->{on_drain}($self)
311	if $self->{low_water_mark} >= length $self->{wbuf}	415	if $self->{low_water_mark} >= length $self->{wbuf}
312	&& $self->{on_drain};	416	&& $self->{on_drain};
313		417
314	delete $self->{ww} unless length $self->{wbuf};	418	delete $self->{_ww} unless length $self->{wbuf};
315	} elsif ($! != EAGAIN && $! != EINTR) {	419	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
316	$self->error;	420	$self->error;
317	}	421	}
318	};	422	};
319		423
		424	# try to write data immediately
		425	$cb->();
		426
		427	# if still data left in wbuf, we need to poll
320	$self->{ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb);	428	$self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb)
321		429	if length $self->{wbuf};
322	$cb->($self);
323	};	430	};
		431	}
		432
		433	our %WH;
		434
		435	sub register_write_type($$) {
		436	$WH{$_[0]} = $_[1];
324	}	437	}
325		438
326	sub push_write {	439	sub push_write {
327	my $self = shift;	440	my $self = shift;
328		441
…		…
346	=item $handle->unshift_write (type => @args)	459	=item $handle->unshift_write (type => @args)
347		460
348	Instead of formatting your data yourself, you can also let this module do	461	Instead of formatting your data yourself, you can also let this module do
349	the job by specifying a type and type-specific arguments.	462	the job by specifying a type and type-specific arguments.
350		463
351	Predefined types are:	464	Predefined types are (if you have ideas for additional types, feel free to
		465	drop by and tell us):
352		466
353	=over 4	467	=over 4
354		468
355	=item netstring => $string	469	=item netstring => $string
356		470
357	Formats the given value as netstring	471	Formats the given value as netstring
358	(http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them).	472	(http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them).
359		473
		474	=back
		475
360	=cut	476	=cut
361		477
362	register_write_type netstring => sub {	478	register_write_type netstring => sub {
363	my ($self, $string) = @_;	479	my ($self, $string) = @_;
364		480
365	sprintf "%d:%s,", (length $string), $string	481	sprintf "%d:%s,", (length $string), $string
366	};	482	};
367		483
368	=back	484	=item json => $array_or_hashref
369		485
370	=cut	486	Encodes the given hash or array reference into a JSON object. Unless you
		487	provide your own JSON object, this means it will be encoded to JSON text
		488	in UTF-8.
371		489
		490	JSON objects (and arrays) are self-delimiting, so you can write JSON at
		491	one end of a handle and read them at the other end without using any
		492	additional framing.
372		493
		494	The generated JSON text is guaranteed not to contain any newlines: While
		495	this module doesn't need delimiters after or between JSON texts to be
		496	able to read them, many other languages depend on that.
		497
		498	A simple RPC protocol that interoperates easily with others is to send
		499	JSON arrays (or objects, although arrays are usually the better choice as
		500	they mimic how function argument passing works) and a newline after each
		501	JSON text:
		502
		503	$handle->push_write (json => ["method", "arg1", "arg2"]); # whatever
		504	$handle->push_write ("\012");
		505
		506	An AnyEvent::Handle receiver would simply use the C<json> read type and
		507	rely on the fact that the newline will be skipped as leading whitespace:
		508
		509	$handle->push_read (json => sub { my $array = $_[1]; ... });
		510
		511	Other languages could read single lines terminated by a newline and pass
		512	this line into their JSON decoder of choice.
		513
		514	=cut
		515
		516	register_write_type json => sub {
		517	my ($self, $ref) = @_;
		518
		519	require JSON;
		520
		521	$self->{json} ? $self->{json}->encode ($ref)
		522	: JSON::encode_json ($ref)
		523	};
		524
		525	=item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args)
		526
		527	This function (not method) lets you add your own types to C<push_write>.
		528	Whenever the given C<type> is used, C<push_write> will invoke the code
		529	reference with the handle object and the remaining arguments.
		530
		531	The code reference is supposed to return a single octet string that will
		532	be appended to the write buffer.
		533
		534	Note that this is a function, and all types registered this way will be
		535	global, so try to use unique names.
		536
		537	=cut
373		538
374	#############################################################################	539	#############################################################################
375		540
376	=back	541	=back
377		542
…		…
456		621
457	if (	622	if (
458	defined $self->{rbuf_max}	623	defined $self->{rbuf_max}
459	&& $self->{rbuf_max} < length $self->{rbuf}	624	&& $self->{rbuf_max} < length $self->{rbuf}
460	) {	625	) {
461	$! = &Errno::ENOSPC; return $self->error;	626	$! = &Errno::ENOSPC;
		627	$self->error;
462	}	628	}
463		629
464	return if $self->{in_drain};	630	return if $self->{in_drain};
465	local $self->{in_drain} = 1;	631	local $self->{in_drain} = 1;
466		632
467	while (my $len = length $self->{rbuf}) {	633	while (my $len = length $self->{rbuf}) {
468	no strict 'refs';	634	no strict 'refs';
469	if (my $cb = shift @{ $self->{queue} }) {	635	if (my $cb = shift @{ $self->{_queue} }) {
470	unless ($cb->($self)) {	636	unless ($cb->($self)) {
471	if ($self->{eof}) {	637	if ($self->{_eof}) {
472	# no progress can be made (not enough data and no data forthcoming)	638	# no progress can be made (not enough data and no data forthcoming)
473	$! = &Errno::EPIPE; return $self->error;	639	$! = &Errno::EPIPE;
		640	$self->error;
474	}	641	}
475		642
476	unshift @{ $self->{queue} }, $cb;	643	unshift @{ $self->{_queue} }, $cb;
477	return;	644	return;
478	}	645	}
479	} elsif ($self->{on_read}) {	646	} elsif ($self->{on_read}) {
480	$self->{on_read}($self);	647	$self->{on_read}($self);
481		648
482	if (	649	if (
483	$self->{eof} # if no further data will arrive	650	$self->{_eof} # if no further data will arrive
484	&& $len == length $self->{rbuf} # and no data has been consumed	651	&& $len == length $self->{rbuf} # and no data has been consumed
485	&& !@{ $self->{queue} } # and the queue is still empty	652	&& !@{ $self->{_queue} } # and the queue is still empty
486	&& $self->{on_read} # and we still want to read data	653	&& $self->{on_read} # and we still want to read data
487	) {	654	) {
488	# then no progress can be made	655	# then no progress can be made
489	$! = &Errno::EPIPE; return $self->error;	656	$! = &Errno::EPIPE;
		657	$self->error;
490	}	658	}
491	} else {	659	} else {
492	# read side becomes idle	660	# read side becomes idle
493	delete $self->{rw};	661	delete $self->{_rw};
494	return;	662	return;
495	}	663	}
496	}	664	}
497		665
498	if ($self->{eof}) {	666	if ($self->{_eof}) {
499	$self->_shutdown;	667	$self->_shutdown;
500	$self->{on_eof}($self)	668	$self->{on_eof}($self)
501	if $self->{on_eof};	669	if $self->{on_eof};
502	}	670	}
503	}	671	}
…		…
552	interested in (which can be none at all) and return a true value. After returning	720	interested in (which can be none at all) and return a true value. After returning
553	true, it will be removed from the queue.	721	true, it will be removed from the queue.
554		722
555	=cut	723	=cut
556		724
		725	our %RH;
		726
		727	sub register_read_type($$) {
		728	$RH{$_[0]} = $_[1];
		729	}
		730
557	sub push_read {	731	sub push_read {
558	my $self = shift;	732	my $self = shift;
559	my $cb = pop;	733	my $cb = pop;
560		734
561	if (@_) {	735	if (@_) {
…		…
563		737
564	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")	738	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read")
565	->($self, $cb, @_);	739	->($self, $cb, @_);
566	}	740	}
567		741
568	push @{ $self->{queue} }, $cb;	742	push @{ $self->{_queue} }, $cb;
569	$self->_drain_rbuf;	743	$self->_drain_rbuf;
570	}	744	}
571		745
572	sub unshift_read {	746	sub unshift_read {
573	my $self = shift;	747	my $self = shift;
…		…
579	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read")	753	$cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read")
580	->($self, $cb, @_);	754	->($self, $cb, @_);
581	}	755	}
582		756
583		757
584	unshift @{ $self->{queue} }, $cb;	758	unshift @{ $self->{_queue} }, $cb;
585	$self->_drain_rbuf;	759	$self->_drain_rbuf;
586	}	760	}
587		761
588	=item $handle->push_read (type => @args, $cb)	762	=item $handle->push_read (type => @args, $cb)
589		763
…		…
591		765
592	Instead of providing a callback that parses the data itself you can chose	766	Instead of providing a callback that parses the data itself you can chose
593	between a number of predefined parsing formats, for chunks of data, lines	767	between a number of predefined parsing formats, for chunks of data, lines
594	etc.	768	etc.
595		769
596	The types currently supported are:	770	Predefined types are (if you have ideas for additional types, feel free to
		771	drop by and tell us):
597		772
598	=over 4	773	=over 4
599		774
600	=item chunk => $octets, $cb->($self, $data)	775	=item chunk => $octets, $cb->($handle, $data)
601		776
602	Invoke the callback only once C<$octets> bytes have been read. Pass the	777	Invoke the callback only once C<$octets> bytes have been read. Pass the
603	data read to the callback. The callback will never be called with less	778	data read to the callback. The callback will never be called with less
604	data.	779	data.
605		780
…		…
628		803
629	sub unshift_read_chunk {	804	sub unshift_read_chunk {
630	$_[0]->unshift_read (chunk => $_[1], $_[2]);	805	$_[0]->unshift_read (chunk => $_[1], $_[2]);
631	}	806	}
632		807
633	=item line => [$eol, ]$cb->($self, $line, $eol)	808	=item line => [$eol, ]$cb->($handle, $line, $eol)
634		809
635	The callback will be called only once a full line (including the end of	810	The callback will be called only once a full line (including the end of
636	line marker, C<$eol>) has been read. This line (excluding the end of line	811	line marker, C<$eol>) has been read. This line (excluding the end of line
637	marker) will be passed to the callback as second argument (C<$line>), and	812	marker) will be passed to the callback as second argument (C<$line>), and
638	the end of line marker as the third argument (C<$eol>).	813	the end of line marker as the third argument (C<$eol>).
…		…
675	sub unshift_read_line {	850	sub unshift_read_line {
676	my $self = shift;	851	my $self = shift;
677	$self->unshift_read (line => @_);	852	$self->unshift_read (line => @_);
678	}	853	}
679		854
680	=item netstring => $cb->($string)	855	=item netstring => $cb->($handle, $string)
681		856
682	A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement).	857	A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement).
683		858
684	Throws an error with C<$!> set to EBADMSG on format violations.	859	Throws an error with C<$!> set to EBADMSG on format violations.
685		860
…		…
713		888
714	1	889	1
715	}	890	}
716	};	891	};
717		892
		893	=item regex => $accept[, $reject[, $skip], $cb->($handle, $data)
		894
		895	Makes a regex match against the regex object C<$accept> and returns
		896	everything up to and including the match.
		897
		898	Example: read a single line terminated by '\n'.
		899
		900	$handle->push_read (regex => qr<\n>, sub { ... });
		901
		902	If C<$reject> is given and not undef, then it determines when the data is
		903	to be rejected: it is matched against the data when the C<$accept> regex
		904	does not match and generates an C<EBADMSG> error when it matches. This is
		905	useful to quickly reject wrong data (to avoid waiting for a timeout or a
		906	receive buffer overflow).
		907
		908	Example: expect a single decimal number followed by whitespace, reject
		909	anything else (not the use of an anchor).
		910
		911	$handle->push_read (regex => qr<^[0-9]+\s>, qr<[^0-9]>, sub { ... });
		912
		913	If C<$skip> is given and not C<undef>, then it will be matched against
		914	the receive buffer when neither C<$accept> nor C<$reject> match,
		915	and everything preceding and including the match will be accepted
		916	unconditionally. This is useful to skip large amounts of data that you
		917	know cannot be matched, so that the C<$accept> or C<$reject> regex do not
		918	have to start matching from the beginning. This is purely an optimisation
		919	and is usually worth only when you expect more than a few kilobytes.
		920
		921	Example: expect a http header, which ends at C<\015\012\015\012>. Since we
		922	expect the header to be very large (it isn't in practise, but...), we use
		923	a skip regex to skip initial portions. The skip regex is tricky in that
		924	it only accepts something not ending in either \015 or \012, as these are
		925	required for the accept regex.
		926
		927	$handle->push_read (regex =>
		928	qr<\015\012\015\012>,
		929	undef, # no reject
		930	qr<^.*[^\015\012]>,
		931	sub { ... });
		932
		933	=cut
		934
		935	register_read_type regex => sub {
		936	my ($self, $cb, $accept, $reject, $skip) = @_;
		937
		938	my $data;
		939	my $rbuf = \$self->{rbuf};
		940
		941	sub {
		942	# accept
		943	if ($$rbuf =~ $accept) {
		944	$data .= substr $$rbuf, 0, $+[0], "";
		945	$cb->($self, $data);
		946	return 1;
		947	}
		948
		949	# reject
		950	if ($reject && $$rbuf =~ $reject) {
		951	$! = &Errno::EBADMSG;
		952	$self->error;
		953	}
		954
		955	# skip
		956	if ($skip && $$rbuf =~ $skip) {
		957	$data .= substr $$rbuf, 0, $+[0], "";
		958	}
		959
		960	()
		961	}
		962	};
		963
		964	=item json => $cb->($handle, $hash_or_arrayref)
		965
		966	Reads a JSON object or array, decodes it and passes it to the callback.
		967
		968	If a C<json> object was passed to the constructor, then that will be used
		969	for the final decode, otherwise it will create a JSON coder expecting UTF-8.
		970
		971	This read type uses the incremental parser available with JSON version
		972	2.09 (and JSON::XS version 2.2) and above. You have to provide a
		973	dependency on your own: this module will load the JSON module, but
		974	AnyEvent does not depend on it itself.
		975
		976	Since JSON texts are fully self-delimiting, the C<json> read and write
		977	types are an ideal simple RPC protocol: just exchange JSON datagrams. See
		978	the C<json> write type description, above, for an actual example.
		979
		980	=cut
		981
		982	register_read_type json => sub {
		983	my ($self, $cb, $accept, $reject, $skip) = @_;
		984
		985	require JSON;
		986
		987	my $data;
		988	my $rbuf = \$self->{rbuf};
		989
		990	my $json = $self->{json} \|\|= JSON->new->utf8;
		991
		992	sub {
		993	my $ref = $json->incr_parse ($self->{rbuf});
		994
		995	if ($ref) {
		996	$self->{rbuf} = $json->incr_text;
		997	$json->incr_text = "";
		998	$cb->($self, $ref);
		999
		1000	1
		1001	} else {
		1002	$self->{rbuf} = "";
		1003	()
		1004	}
		1005	}
		1006	};
		1007
718	=back	1008	=back
		1009
		1010	=item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args)
		1011
		1012	This function (not method) lets you add your own types to C<push_read>.
		1013
		1014	Whenever the given C<type> is used, C<push_read> will invoke the code
		1015	reference with the handle object, the callback and the remaining
		1016	arguments.
		1017
		1018	The code reference is supposed to return a callback (usually a closure)
		1019	that works as a plain read callback (see C<< ->push_read ($cb) >>).
		1020
		1021	It should invoke the passed callback when it is done reading (remember to
		1022	pass C<$handle> as first argument as all other callbacks do that).
		1023
		1024	Note that this is a function, and all types registered this way will be
		1025	global, so try to use unique names.
		1026
		1027	For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>,
		1028	search for C<register_read_type>)).
719		1029
720	=item $handle->stop_read	1030	=item $handle->stop_read
721		1031
722	=item $handle->start_read	1032	=item $handle->start_read
723		1033
…		…
729	=cut	1039	=cut
730		1040
731	sub stop_read {	1041	sub stop_read {
732	my ($self) = @_;	1042	my ($self) = @_;
733		1043
734	delete $self->{rw};	1044	delete $self->{_rw};
735	}	1045	}
736		1046
737	sub start_read {	1047	sub start_read {
738	my ($self) = @_;	1048	my ($self) = @_;
739		1049
740	unless ($self->{rw} \|\| $self->{eof}) {	1050	unless ($self->{_rw} \|\| $self->{_eof}) {
741	Scalar::Util::weaken $self;	1051	Scalar::Util::weaken $self;
742		1052
743	$self->{rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1053	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
744	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1054	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};
745	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;	1055	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;
746		1056
747	if ($len > 0) {	1057	if ($len > 0) {
		1058	$self->{_activity} = AnyEvent->now;
		1059
748	$self->{filter_r}	1060	$self->{filter_r}
749	? $self->{filter_r}->($self, $rbuf)	1061	? $self->{filter_r}->($self, $rbuf)
750	: $self->_drain_rbuf;	1062	: $self->_drain_rbuf;
751		1063
752	} elsif (defined $len) {	1064	} elsif (defined $len) {
753	delete $self->{rw};	1065	delete $self->{_rw};
754	$self->{eof} = 1;	1066	$self->{_eof} = 1;
755	$self->_drain_rbuf;	1067	$self->_drain_rbuf;
756		1068
757	} elsif ($! != EAGAIN && $! != EINTR) {	1069	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
758	return $self->error;	1070	return $self->error;
759	}	1071	}
760	});	1072	});
761	}	1073	}
762	}	1074	}
763		1075
764	sub _dotls {	1076	sub _dotls {
765	my ($self) = @_;	1077	my ($self) = @_;
766		1078
767	if (length $self->{tls_wbuf}) {	1079	if (length $self->{_tls_wbuf}) {
768	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{tls_wbuf})) > 0) {	1080	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
769	substr $self->{tls_wbuf}, 0, $len, "";	1081	substr $self->{_tls_wbuf}, 0, $len, "";
770	}	1082	}
771	}	1083	}
772		1084
773	if (defined (my $buf = Net::SSLeay::BIO_read ($self->{tls_wbio}))) {	1085	if (defined (my $buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {
774	$self->{wbuf} .= $buf;	1086	$self->{wbuf} .= $buf;
775	$self->_drain_wbuf;	1087	$self->_drain_wbuf;
776	}	1088	}
777		1089
778	while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) {	1090	while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) {
…		…
804	C<"connect">, C<"accept"> or an existing Net::SSLeay object).	1116	C<"connect">, C<"accept"> or an existing Net::SSLeay object).
805		1117
806	The second argument is the optional C<Net::SSLeay::CTX> object that is	1118	The second argument is the optional C<Net::SSLeay::CTX> object that is
807	used when AnyEvent::Handle has to create its own TLS connection object.	1119	used when AnyEvent::Handle has to create its own TLS connection object.
808		1120
		1121	The TLS connection object will end up in C<< $handle->{tls} >> after this
		1122	call and can be used or changed to your liking. Note that the handshake
		1123	might have already started when this function returns.
		1124
809	=cut	1125	=cut
810		1126
811	# TODO: maybe document...	1127	# TODO: maybe document...
812	sub starttls {	1128	sub starttls {
813	my ($self, $ssl, $ctx) = @_;	1129	my ($self, $ssl, $ctx) = @_;
…		…
828	# but the openssl maintainers basically said: "trust us, it just works".	1144	# but the openssl maintainers basically said: "trust us, it just works".
829	# (unfortunately, we have to hardcode constants because the abysmally misdesigned	1145	# (unfortunately, we have to hardcode constants because the abysmally misdesigned
830	# and mismaintained ssleay-module doesn't even offer them).	1146	# and mismaintained ssleay-module doesn't even offer them).
831	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html	1147	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
832	Net::SSLeay::CTX_set_mode ($self->{tls},	1148	Net::SSLeay::CTX_set_mode ($self->{tls},
833	(eval { Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)	1149	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)
834	\| (eval { Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));	1150	\| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));
835		1151
836	$self->{tls_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1152	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
837	$self->{tls_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1153	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
838		1154
839	Net::SSLeay::set_bio ($ssl, $self->{tls_rbio}, $self->{tls_wbio});	1155	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});
840		1156
841	$self->{filter_w} = sub {	1157	$self->{filter_w} = sub {
842	$_[0]{tls_wbuf} .= ${$_[1]};	1158	$_[0]{_tls_wbuf} .= ${$_[1]};
843	&_dotls;	1159	&_dotls;
844	};	1160	};
845	$self->{filter_r} = sub {	1161	$self->{filter_r} = sub {
846	Net::SSLeay::BIO_write ($_[0]{tls_rbio}, ${$_[1]});	1162	Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]});
847	&_dotls;	1163	&_dotls;
848	};	1164	};
849	}	1165	}
850		1166
851	=item $handle->stoptls	1167	=item $handle->stoptls
…		…
857		1173
858	sub stoptls {	1174	sub stoptls {
859	my ($self) = @_;	1175	my ($self) = @_;
860		1176
861	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};	1177	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};
		1178
862	delete $self->{tls_rbio};	1179	delete $self->{_rbio};
863	delete $self->{tls_wbio};	1180	delete $self->{_wbio};
864	delete $self->{tls_wbuf};	1181	delete $self->{_tls_wbuf};
865	delete $self->{filter_r};	1182	delete $self->{filter_r};
866	delete $self->{filter_w};	1183	delete $self->{filter_w};
867	}	1184	}
868		1185
869	sub DESTROY {	1186	sub DESTROY {
…		…
907	}	1224	}
908	}	1225	}
909		1226
910	=back	1227	=back
911		1228
		1229	=head1 SUBCLASSING AnyEvent::Handle
		1230
		1231	In many cases, you might want to subclass AnyEvent::Handle.
		1232
		1233	To make this easier, a given version of AnyEvent::Handle uses these
		1234	conventions:
		1235
		1236	=over 4
		1237
		1238	=item * all constructor arguments become object members.
		1239
		1240	At least initially, when you pass a C<tls>-argument to the constructor it
		1241	will end up in C<< $handle->{tls} >>. Those members might be changes or
		1242	mutated later on (for example C<tls> will hold the TLS connection object).
		1243
		1244	=item * other object member names are prefixed with an C<_>.
		1245
		1246	All object members not explicitly documented (internal use) are prefixed
		1247	with an underscore character, so the remaining non-C<_>-namespace is free
		1248	for use for subclasses.
		1249
		1250	=item * all members not documented here and not prefixed with an underscore
		1251	are free to use in subclasses.
		1252
		1253	Of course, new versions of AnyEvent::Handle may introduce more "public"
		1254	member variables, but thats just life, at least it is documented.
		1255
		1256	=back
		1257
912	=head1 AUTHOR	1258	=head1 AUTHOR
913		1259
914	Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>.	1260	Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>.
915		1261
916	=cut	1262	=cut

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents): Revision 1.29 by root, Sat May 24 23:10:18 2008 UTC vs. Revision 1.47 by root, Thu May 29 00:25:28 2008 UTC

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.29 by root, Sat May 24 23:10:18 2008 UTC vs.
Revision 1.47 by root, Thu May 29 00:25:28 2008 UTC