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

Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.89 by root, Sat Sep 6 10:54:32 2008 UTC vs.
Revision 1.108 by root, Tue Jan 6 20:08:05 2009 UTC

…		…
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		16
17	=cut	17	=cut
18		18
19	our $VERSION = 4.234;	19	our $VERSION = 4.331;
20		20
21	=head1 SYNOPSIS	21	=head1 SYNOPSIS
22		22
23	use AnyEvent;	23	use AnyEvent;
24	use AnyEvent::Handle;	24	use AnyEvent::Handle;
…		…
27		27
28	my $handle =	28	my $handle =
29	AnyEvent::Handle->new (	29	AnyEvent::Handle->new (
30	fh => \*STDIN,	30	fh => \*STDIN,
31	on_eof => sub {	31	on_eof => sub {
32	$cv->broadcast;	32	$cv->send;
33	},	33	},
34	);	34	);
35		35
36	# send some request line	36	# send some request line
37	$handle->push_write ("getinfo\015\012");	37	$handle->push_write ("getinfo\015\012");
…		…
84	Set the callback to be called when an end-of-file condition is detected,	84	Set the callback to be called when an end-of-file condition is detected,
85	i.e. in the case of a socket, when the other side has closed the	85	i.e. in the case of a socket, when the other side has closed the
86	connection cleanly.	86	connection cleanly.
87		87
88	For sockets, this just means that the other side has stopped sending data,	88	For sockets, this just means that the other side has stopped sending data,
89	you can still try to write data, and, in fact, one can return from the eof	89	you can still try to write data, and, in fact, one can return from the EOF
90	callback and continue writing data, as only the read part has been shut	90	callback and continue writing data, as only the read part has been shut
91	down.	91	down.
92		92
93	While not mandatory, it is I<highly> recommended to set an eof callback,	93	While not mandatory, it is I<highly> recommended to set an EOF callback,
94	otherwise you might end up with a closed socket while you are still	94	otherwise you might end up with a closed socket while you are still
95	waiting for data.	95	waiting for data.
96		96
97	If an EOF condition has been detected but no C<on_eof> callback has been	97	If an EOF condition has been detected but no C<on_eof> callback has been
98	set, then a fatal error will be raised with C<$!> set to <0>.	98	set, then a fatal error will be raised with C<$!> set to <0>.
…		…
232	write data and will install a watcher that will write this data to the	232	write data and will install a watcher that will write this data to the
233	socket. No errors will be reported (this mostly matches how the operating	233	socket. No errors will be reported (this mostly matches how the operating
234	system treats outstanding data at socket close time).	234	system treats outstanding data at socket close time).
235		235
236	This will not work for partial TLS data that could not be encoded	236	This will not work for partial TLS data that could not be encoded
237	yet. This data will be lost.	237	yet. This data will be lost. Calling the C<stoptls> method in time might
		238	help.
238		239
239	=item tls => "accept" \| "connect" \| Net::SSLeay::SSL object	240	=item tls => "accept" \| "connect" \| Net::SSLeay::SSL object
240		241
241	When this parameter is given, it enables TLS (SSL) mode, that means	242	When this parameter is given, it enables TLS (SSL) mode, that means
242	AnyEvent will start a TLS handshake as soon as the conenction has been	243	AnyEvent will start a TLS handshake as soon as the conenction has been
…		…
273	texts.	274	texts.
274		275
275	Note that you are responsible to depend on the JSON module if you want to	276	Note that you are responsible to depend on the JSON module if you want to
276	use this functionality, as AnyEvent does not have a dependency itself.	277	use this functionality, as AnyEvent does not have a dependency itself.
277		278
278	=item filter_r => $cb
279
280	=item filter_w => $cb
281
282	These exist, but are undocumented at this time. (They are used internally
283	by the TLS code).
284
285	=back	279	=back
286		280
287	=cut	281	=cut
288		282
289	sub new {	283	sub new {
…		…
293		287
294	$self->{fh} or Carp::croak "mandatory argument fh is missing";	288	$self->{fh} or Carp::croak "mandatory argument fh is missing";
295		289
296	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;	290	AnyEvent::Util::fh_nonblocking $self->{fh}, 1;
297		291
298	if ($self->{tls}) {
299	require Net::SSLeay;
300	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx});	292	$self->starttls (delete $self->{tls}, delete $self->{tls_ctx})
301	}	293	if $self->{tls};
302		294
303	$self->{_activity} = AnyEvent->now;	295	$self->{_activity} = AnyEvent->now;
304	$self->_timeout;	296	$self->_timeout;
305		297
306	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};	298	$self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain};
…		…
318	delete $self->{_tw};	310	delete $self->{_tw};
319	delete $self->{_rw};	311	delete $self->{_rw};
320	delete $self->{_ww};	312	delete $self->{_ww};
321	delete $self->{fh};	313	delete $self->{fh};
322		314
323	$self->stoptls;	315	&_freetls;
324		316
325	delete $self->{on_read};	317	delete $self->{on_read};
326	delete $self->{_queue};	318	delete $self->{_queue};
327	}	319	}
328		320
…		…
334		326
335	$! = $errno;	327	$! = $errno;
336		328
337	if ($self->{on_error}) {	329	if ($self->{on_error}) {
338	$self->{on_error}($self, $fatal);	330	$self->{on_error}($self, $fatal);
339	} else {	331	} elsif ($self->{fh}) {
340	Carp::croak "AnyEvent::Handle uncaught error: $!";	332	Carp::croak "AnyEvent::Handle uncaught error: $!";
341	}	333	}
342	}	334	}
343		335
344	=item $fh = $handle->fh	336	=item $fh = $handle->fh
…		…
382	}	374	}
383		375
384	=item $handle->autocork ($boolean)	376	=item $handle->autocork ($boolean)
385		377
386	Enables or disables the current autocork behaviour (see C<autocork>	378	Enables or disables the current autocork behaviour (see C<autocork>
387	constructor argument).	379	constructor argument). Changes will only take effect on the next write.
388		380
389	=cut	381	=cut
		382
		383	sub autocork {
		384	$_[0]{autocork} = $_[1];
		385	}
390		386
391	=item $handle->no_delay ($boolean)	387	=item $handle->no_delay ($boolean)
392		388
393	Enables or disables the C<no_delay> setting (see constructor argument of	389	Enables or disables the C<no_delay> setting (see constructor argument of
394	the same name for details).	390	the same name for details).
…		…
487	my ($self, $cb) = @_;	483	my ($self, $cb) = @_;
488		484
489	$self->{on_drain} = $cb;	485	$self->{on_drain} = $cb;
490		486
491	$cb->($self)	487	$cb->($self)
492	if $cb && $self->{low_water_mark} >= length $self->{wbuf};	488	if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf});
493	}	489	}
494		490
495	=item $handle->push_write ($data)	491	=item $handle->push_write ($data)
496		492
497	Queues the given scalar to be written. You can push as much data as you	493	Queues the given scalar to be written. You can push as much data as you
…		…
514	substr $self->{wbuf}, 0, $len, "";	510	substr $self->{wbuf}, 0, $len, "";
515		511
516	$self->{_activity} = AnyEvent->now;	512	$self->{_activity} = AnyEvent->now;
517		513
518	$self->{on_drain}($self)	514	$self->{on_drain}($self)
519	if $self->{low_water_mark} >= length $self->{wbuf}	515	if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf})
520	&& $self->{on_drain};	516	&& $self->{on_drain};
521		517
522	delete $self->{_ww} unless length $self->{wbuf};	518	delete $self->{_ww} unless length $self->{wbuf};
523	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {	519	} elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) {
524	$self->_error ($!, 1);	520	$self->_error ($!, 1);
…		…
548		544
549	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")	545	@_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write")
550	->($self, @_);	546	->($self, @_);
551	}	547	}
552		548
553	if ($self->{filter_w}) {	549	if ($self->{tls}) {
554	$self->{filter_w}($self, \$_[0]);	550	$self->{_tls_wbuf} .= $_[0];
		551
		552	&_dotls ($self);
555	} else {	553	} else {
556	$self->{wbuf} .= $_[0];	554	$self->{wbuf} .= $_[0];
557	$self->_drain_wbuf;	555	$self->_drain_wbuf;
558	}	556	}
559	}	557	}
…		…
576	=cut	574	=cut
577		575
578	register_write_type netstring => sub {	576	register_write_type netstring => sub {
579	my ($self, $string) = @_;	577	my ($self, $string) = @_;
580		578
581	sprintf "%d:%s,", (length $string), $string	579	(length $string) . ":$string,"
582	};	580	};
583		581
584	=item packstring => $format, $data	582	=item packstring => $format, $data
585		583
586	An octet string prefixed with an encoded length. The encoding C<$format>	584	An octet string prefixed with an encoded length. The encoding C<$format>
…		…
795		793
796	last; # more data might arrive	794	last; # more data might arrive
797	}	795	}
798	} else {	796	} else {
799	# read side becomes idle	797	# read side becomes idle
800	delete $self->{_rw};	798	delete $self->{_rw} unless $self->{tls};
801	last;	799	last;
802	}	800	}
803	}	801	}
804		802
805	if ($self->{_eof}) {	803	if ($self->{_eof}) {
…		…
1100	An octet string prefixed with an encoded length. The encoding C<$format>	1098	An octet string prefixed with an encoded length. The encoding C<$format>
1101	uses the same format as a Perl C<pack> format, but must specify a single	1099	uses the same format as a Perl C<pack> format, but must specify a single
1102	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an	1100	integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an
1103	optional C<!>, C<< < >> or C<< > >> modifier).	1101	optional C<!>, C<< < >> or C<< > >> modifier).
1104		1102
1105	DNS over TCP uses a prefix of C<n>, EPP uses a prefix of C<N>.	1103	For example, DNS over TCP uses a prefix of C<n> (2 octet network order),
		1104	EPP uses a prefix of C<N> (4 octtes).
1106		1105
1107	Example: read a block of data prefixed by its length in BER-encoded	1106	Example: read a block of data prefixed by its length in BER-encoded
1108	format (very efficient).	1107	format (very efficient).
1109		1108
1110	$handle->push_read (packstring => "w", sub {	1109	$handle->push_read (packstring => "w", sub {
…		…
1263	Note that AnyEvent::Handle will automatically C<start_read> for you when	1262	Note that AnyEvent::Handle will automatically C<start_read> for you when
1264	you change the C<on_read> callback or push/unshift a read callback, and it	1263	you change the C<on_read> callback or push/unshift a read callback, and it
1265	will automatically C<stop_read> for you when neither C<on_read> is set nor	1264	will automatically C<stop_read> for you when neither C<on_read> is set nor
1266	there are any read requests in the queue.	1265	there are any read requests in the queue.
1267		1266
		1267	These methods will have no effect when in TLS mode (as TLS doesn't support
		1268	half-duplex connections).
		1269
1268	=cut	1270	=cut
1269		1271
1270	sub stop_read {	1272	sub stop_read {
1271	my ($self) = @_;	1273	my ($self) = @_;
1272		1274
1273	delete $self->{_rw};	1275	delete $self->{_rw} unless $self->{tls};
1274	}	1276	}
1275		1277
1276	sub start_read {	1278	sub start_read {
1277	my ($self) = @_;	1279	my ($self) = @_;
1278		1280
1279	unless ($self->{_rw} \|\| $self->{_eof}) {	1281	unless ($self->{_rw} \|\| $self->{_eof}) {
1280	Scalar::Util::weaken $self;	1282	Scalar::Util::weaken $self;
1281		1283
1282	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {	1284	$self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub {
1283	my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf};	1285	my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf});
1284	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;	1286	my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} \|\| 8192, length $$rbuf;
1285		1287
1286	if ($len > 0) {	1288	if ($len > 0) {
1287	$self->{_activity} = AnyEvent->now;	1289	$self->{_activity} = AnyEvent->now;
1288		1290
1289	$self->{filter_r}	1291	if ($self->{tls}) {
1290	? $self->{filter_r}($self, $rbuf)	1292	Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf);
1291	: $self->{_in_drain} \|\| $self->_drain_rbuf;	1293
		1294	&_dotls ($self);
		1295	} else {
		1296	$self->_drain_rbuf unless $self->{_in_drain};
		1297	}
1292		1298
1293	} elsif (defined $len) {	1299	} elsif (defined $len) {
1294	delete $self->{_rw};	1300	delete $self->{_rw};
1295	$self->{_eof} = 1;	1301	$self->{_eof} = 1;
1296	$self->_drain_rbuf unless $self->{_in_drain};	1302	$self->_drain_rbuf unless $self->{_in_drain};
…		…
1300	}	1306	}
1301	});	1307	});
1302	}	1308	}
1303	}	1309	}
1304		1310
		1311	# poll the write BIO and send the data if applicable
1305	sub _dotls {	1312	sub _dotls {
1306	my ($self) = @_;	1313	my ($self) = @_;
1307		1314
1308	my $buf;	1315	my $tmp;
1309		1316
1310	if (length $self->{_tls_wbuf}) {	1317	if (length $self->{_tls_wbuf}) {
1311	while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {	1318	while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) {
1312	substr $self->{_tls_wbuf}, 0, $len, "";	1319	substr $self->{_tls_wbuf}, 0, $tmp, "";
1313	}	1320	}
1314	}	1321	}
1315		1322
1316	if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) {
1317	$self->{wbuf} .= $buf;
1318	$self->_drain_wbuf;
1319	}
1320
1321	while (defined ($buf = Net::SSLeay::read ($self->{tls}))) {	1323	while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) {
1322	if (length $buf) {	1324	unless (length $tmp) {
1323	$self->{rbuf} .= $buf;
1324	$self->_drain_rbuf unless $self->{_in_drain};
1325	} else {
1326	# let's treat SSL-eof as we treat normal EOF	1325	# let's treat SSL-eof as we treat normal EOF
		1326	delete $self->{_rw};
1327	$self->{_eof} = 1;	1327	$self->{_eof} = 1;
1328	$self->_shutdown;	1328	&_freetls;
1329	return;
1330	}	1329	}
1331	}
1332		1330
		1331	$self->{rbuf} .= $tmp;
		1332	$self->_drain_rbuf unless $self->{_in_drain};
		1333	$self->{tls} or return; # tls session might have gone away in callback
		1334	}
		1335
1333	my $err = Net::SSLeay::get_error ($self->{tls}, -1);	1336	$tmp = Net::SSLeay::get_error ($self->{tls}, -1);
1334		1337
1335	if ($err!= Net::SSLeay::ERROR_WANT_READ ()) {	1338	if ($tmp != Net::SSLeay::ERROR_WANT_READ ()) {
1336	if ($err == Net::SSLeay::ERROR_SYSCALL ()) {	1339	if ($tmp == Net::SSLeay::ERROR_SYSCALL ()) {
1337	return $self->_error ($!, 1);	1340	return $self->_error ($!, 1);
1338	} elsif ($err == Net::SSLeay::ERROR_SSL ()) {	1341	} elsif ($tmp == Net::SSLeay::ERROR_SSL ()) {
1339	return $self->_error (&Errno::EIO, 1);	1342	return $self->_error (&Errno::EIO, 1);
1340	}	1343	}
1341		1344
1342	# all others are fine for our purposes	1345	# all other errors are fine for our purposes
		1346	}
		1347
		1348	while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) {
		1349	$self->{wbuf} .= $tmp;
		1350	$self->_drain_wbuf;
1343	}	1351	}
1344	}	1352	}
1345		1353
1346	=item $handle->starttls ($tls[, $tls_ctx])	1354	=item $handle->starttls ($tls[, $tls_ctx])
1347		1355
…		…
1357		1365
1358	The TLS connection object will end up in C<< $handle->{tls} >> after this	1366	The TLS connection object will end up in C<< $handle->{tls} >> after this
1359	call and can be used or changed to your liking. Note that the handshake	1367	call and can be used or changed to your liking. Note that the handshake
1360	might have already started when this function returns.	1368	might have already started when this function returns.
1361		1369
		1370	If it an error to start a TLS handshake more than once per
		1371	AnyEvent::Handle object (this is due to bugs in OpenSSL).
		1372
1362	=cut	1373	=cut
1363		1374
1364	sub starttls {	1375	sub starttls {
1365	my ($self, $ssl, $ctx) = @_;	1376	my ($self, $ssl, $ctx) = @_;
1366		1377
1367	$self->stoptls;	1378	require Net::SSLeay;
1368		1379
		1380	Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object"
		1381	if $self->{tls};
		1382
1369	if ($ssl eq "accept") {	1383	if ($ssl eq "accept") {
1370	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1384	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());
1371	Net::SSLeay::set_accept_state ($ssl);	1385	Net::SSLeay::set_accept_state ($ssl);
1372	} elsif ($ssl eq "connect") {	1386	} elsif ($ssl eq "connect") {
1373	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());	1387	$ssl = Net::SSLeay::new ($ctx \|\| TLS_CTX ());
…		…
1382	# and mismaintained ssleay-module doesn't even offer them).	1396	# and mismaintained ssleay-module doesn't even offer them).
1383	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html	1397	# http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html
1384	#	1398	#
1385	# in short: this is a mess.	1399	# in short: this is a mess.
1386	#	1400	#
1387	# note that we do not try to kepe the length constant between writes as we are required to do.	1401	# note that we do not try to keep the length constant between writes as we are required to do.
1388	# we assume that most (but not all) of this insanity only applies to non-blocking cases,	1402	# we assume that most (but not all) of this insanity only applies to non-blocking cases,
1389	# and we drive openssl fully in blocking mode here.	1403	# and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to
		1404	# have identity issues in that area.
1390	Net::SSLeay::CTX_set_mode ($self->{tls},	1405	Net::SSLeay::CTX_set_mode ($self->{tls},
1391	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)	1406	(eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } \|\| 1)
1392	\| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));	1407	\| (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } \|\| 2));
1393		1408
1394	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1409	$self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1395	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());	1410	$self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ());
1396		1411
1397	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});	1412	Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio});
1398		1413
1399	$self->{filter_w} = sub {	1414	&_dotls; # need to trigger the initial handshake
1400	$_[0]{_tls_wbuf} .= ${$_[1]};	1415	$self->start_read; # make sure we actually do read
1401	&_dotls;
1402	};
1403	$self->{filter_r} = sub {
1404	Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]});
1405	&_dotls;
1406	};
1407	}	1416	}
1408		1417
1409	=item $handle->stoptls	1418	=item $handle->stoptls
1410		1419
1411	Destroys the SSL connection, if any. Partial read or write data will be	1420	Shuts down the SSL connection - this makes a proper EOF handshake by
1412	lost.	1421	sending a close notify to the other side, but since OpenSSL doesn't
		1422	support non-blocking shut downs, it is not possible to re-use the stream
		1423	afterwards.
1413		1424
1414	=cut	1425	=cut
1415		1426
1416	sub stoptls {	1427	sub stoptls {
1417	my ($self) = @_;	1428	my ($self) = @_;
1418		1429
		1430	if ($self->{tls}) {
		1431	Net::SSLeay::shutdown ($self->{tls});
		1432
		1433	&_dotls;
		1434
		1435	# we don't give a shit. no, we do, but we can't. no...
		1436	# we, we... have to use openssl :/
		1437	&_freetls;
		1438	}
		1439	}
		1440
		1441	sub _freetls {
		1442	my ($self) = @_;
		1443
		1444	return unless $self->{tls};
		1445
1419	Net::SSLeay::free (delete $self->{tls}) if $self->{tls};	1446	Net::SSLeay::free (delete $self->{tls});
1420		1447
1421	delete $self->{_rbio};	1448	delete @$self{qw(_rbio _wbio _tls_wbuf)};
1422	delete $self->{_wbio};
1423	delete $self->{_tls_wbuf};
1424	delete $self->{filter_r};
1425	delete $self->{filter_w};
1426	}	1449	}
1427		1450
1428	sub DESTROY {	1451	sub DESTROY {
1429	my $self = shift;	1452	my $self = shift;
1430		1453
1431	$self->stoptls;	1454	&_freetls;
1432		1455
1433	my $linger = exists $self->{linger} ? $self->{linger} : 3600;	1456	my $linger = exists $self->{linger} ? $self->{linger} : 3600;
1434		1457
1435	if ($linger && length $self->{wbuf}) {	1458	if ($linger && length $self->{wbuf}) {
1436	my $fh = delete $self->{fh};	1459	my $fh = delete $self->{fh};
…		…
1451	@linger = ();	1474	@linger = ();
1452	});	1475	});
1453	}	1476	}
1454	}	1477	}
1455		1478
		1479	=item $handle->destroy
		1480
		1481	Shuts down the handle object as much as possible - this call ensures that
		1482	no further callbacks will be invoked and resources will be freed as much
		1483	as possible. You must not call any methods on the object afterwards.
		1484
		1485	Normally, you can just "forget" any references to an AnyEvent::Handle
		1486	object and it will simply shut down. This works in fatal error and EOF
		1487	callbacks, as well as code outside. It does I<NOT> work in a read or write
		1488	callback, so when you want to destroy the AnyEvent::Handle object from
		1489	within such an callback. You I<MUST> call C<< ->destroy >> explicitly in
		1490	that case.
		1491
		1492	The handle might still linger in the background and write out remaining
		1493	data, as specified by the C<linger> option, however.
		1494
		1495	=cut
		1496
		1497	sub destroy {
		1498	my ($self) = @_;
		1499
		1500	$self->DESTROY;
		1501	%$self = ();
		1502	}
		1503
1456	=item AnyEvent::Handle::TLS_CTX	1504	=item AnyEvent::Handle::TLS_CTX
1457		1505
1458	This function creates and returns the Net::SSLeay::CTX object used by	1506	This function creates and returns the Net::SSLeay::CTX object used by
1459	default for TLS mode.	1507	default for TLS mode.
1460		1508
…		…
1488	}	1536	}
1489	}	1537	}
1490		1538
1491	=back	1539	=back
1492		1540
		1541
		1542	=head1 NONFREQUENTLY ASKED QUESTIONS
		1543
		1544	=over 4
		1545
		1546	=item I C<undef> the AnyEvent::Handle reference inside my callback and
		1547	still get further invocations!
		1548
		1549	That's because AnyEvent::Handle keeps a reference to itself when handling
		1550	read or write callbacks.
		1551
		1552	It is only safe to "forget" the reference inside EOF or error callbacks,
		1553	from within all other callbacks, you need to explicitly call the C<<
		1554	->destroy >> method.
		1555
		1556	=item I get different callback invocations in TLS mode/Why can't I pause
		1557	reading?
		1558
		1559	Unlike, say, TCP, TLS connections do not consist of two independent
		1560	communication channels, one for each direction. Or put differently. The
		1561	read and write directions are not independent of each other: you cannot
		1562	write data unless you are also prepared to read, and vice versa.
		1563
		1564	This can mean than, in TLS mode, you might get C<on_error> or C<on_eof>
		1565	callback invocations when you are not expecting any read data - the reason
		1566	is that AnyEvent::Handle always reads in TLS mode.
		1567
		1568	During the connection, you have to make sure that you always have a
		1569	non-empty read-queue, or an C<on_read> watcher. At the end of the
		1570	connection (or when you no longer want to use it) you can call the
		1571	C<destroy> method.
		1572
		1573	=item How do I read data until the other side closes the connection?
		1574
		1575	If you just want to read your data into a perl scalar, the easiest way
		1576	to achieve this is by setting an C<on_read> callback that does nothing,
		1577	clearing the C<on_eof> callback and in the C<on_error> callback, the data
		1578	will be in C<$_[0]{rbuf}>:
		1579
		1580	$handle->on_read (sub { });
		1581	$handle->on_eof (undef);
		1582	$handle->on_error (sub {
		1583	my $data = delete $_[0]{rbuf};
		1584	undef $handle;
		1585	});
		1586
		1587	The reason to use C<on_error> is that TCP connections, due to latencies
		1588	and packets loss, might get closed quite violently with an error, when in
		1589	fact, all data has been received.
		1590
		1591	It is usually better to use acknowledgements when transferring data,
		1592	to make sure the other side hasn't just died and you got the data
		1593	intact. This is also one reason why so many internet protocols have an
		1594	explicit QUIT command.
		1595
		1596	=item I don't want to destroy the handle too early - how do I wait until
		1597	all data has been written?
		1598
		1599	After writing your last bits of data, set the C<on_drain> callback
		1600	and destroy the handle in there - with the default setting of
		1601	C<low_water_mark> this will be called precisely when all data has been
		1602	written to the socket:
		1603
		1604	$handle->push_write (...);
		1605	$handle->on_drain (sub {
		1606	warn "all data submitted to the kernel\n";
		1607	undef $handle;
		1608	});
		1609
		1610	=back
		1611
		1612
1493	=head1 SUBCLASSING AnyEvent::Handle	1613	=head1 SUBCLASSING AnyEvent::Handle
1494		1614
1495	In many cases, you might want to subclass AnyEvent::Handle.	1615	In many cases, you might want to subclass AnyEvent::Handle.
1496		1616
1497	To make this easier, a given version of AnyEvent::Handle uses these	1617	To make this easier, a given version of AnyEvent::Handle uses these

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents): Revision 1.89 by root, Sat Sep 6 10:54:32 2008 UTC vs. Revision 1.108 by root, Tue Jan 6 20:08:05 2009 UTC

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Comparing AnyEvent/lib/AnyEvent/Handle.pm (file contents):
Revision 1.89 by root, Sat Sep 6 10:54:32 2008 UTC vs.
Revision 1.108 by root, Tue Jan 6 20:08:05 2009 UTC