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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 = 4.3; |
19 | our $VERSION = 4.32; |
20 | |
20 | |
21 | =head1 SYNOPSIS |
21 | =head1 SYNOPSIS |
22 | |
22 | |
23 | use AnyEvent; |
23 | use AnyEvent; |
24 | use AnyEvent::Handle; |
24 | use AnyEvent::Handle; |
… | |
… | |
59 | treatment of characters applies to this module as well. |
59 | treatment of characters applies to this module as well. |
60 | |
60 | |
61 | All callbacks will be invoked with the handle object as their first |
61 | All callbacks will be invoked with the handle object as their first |
62 | argument. |
62 | argument. |
63 | |
63 | |
64 | =head2 SIGPIPE is not handled by this module |
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65 | |
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66 | SIGPIPE is not handled by this module, so one of the practical |
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67 | requirements of using it is to ignore SIGPIPE (C<$SIG{PIPE} = |
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68 | 'IGNORE'>). At least, this is highly recommend in a networked program: If |
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69 | you use AnyEvent::Handle in a filter program (like sort), exiting on |
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70 | SIGPIPE is probably the right thing to do. |
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71 | |
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72 | =head1 METHODS |
64 | =head1 METHODS |
73 | |
65 | |
74 | =over 4 |
66 | =over 4 |
75 | |
67 | |
76 | =item B<new (%args)> |
68 | =item B<new (%args)> |
… | |
… | |
92 | 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, |
93 | 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 |
94 | connection cleanly. |
86 | connection cleanly. |
95 | |
87 | |
96 | 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, |
97 | 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 |
98 | 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 |
99 | down. |
91 | down. |
100 | |
92 | |
101 | 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, |
102 | 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 |
103 | waiting for data. |
95 | waiting for data. |
104 | |
96 | |
105 | 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 |
106 | 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>. |
… | |
… | |
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 = $handle->fh |
… | |
… | |
550 | ->($self, @_); |
542 | ->($self, @_); |
551 | } |
543 | } |
552 | |
544 | |
553 | if ($self->{tls}) { |
545 | if ($self->{tls}) { |
554 | $self->{_tls_wbuf} .= $_[0]; |
546 | $self->{_tls_wbuf} .= $_[0]; |
|
|
547 | |
555 | &_dotls ($self); |
548 | &_dotls ($self); |
556 | } else { |
549 | } else { |
557 | $self->{wbuf} .= $_[0]; |
550 | $self->{wbuf} .= $_[0]; |
558 | $self->_drain_wbuf; |
551 | $self->_drain_wbuf; |
559 | } |
552 | } |
… | |
… | |
1291 | if ($len > 0) { |
1284 | if ($len > 0) { |
1292 | $self->{_activity} = AnyEvent->now; |
1285 | $self->{_activity} = AnyEvent->now; |
1293 | |
1286 | |
1294 | if ($self->{tls}) { |
1287 | if ($self->{tls}) { |
1295 | Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf); |
1288 | Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf); |
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|
1289 | |
1296 | &_dotls ($self); |
1290 | &_dotls ($self); |
1297 | } else { |
1291 | } else { |
1298 | $self->_drain_rbuf unless $self->{_in_drain}; |
1292 | $self->_drain_rbuf unless $self->{_in_drain}; |
1299 | } |
1293 | } |
1300 | |
1294 | |
… | |
… | |
1308 | } |
1302 | } |
1309 | }); |
1303 | }); |
1310 | } |
1304 | } |
1311 | } |
1305 | } |
1312 | |
1306 | |
|
|
1307 | # poll the write BIO and send the data if applicable |
1313 | sub _dotls { |
1308 | sub _dotls { |
1314 | my ($self) = @_; |
1309 | my ($self) = @_; |
1315 | |
1310 | |
1316 | my $buf; |
1311 | my $tmp; |
1317 | |
1312 | |
1318 | if (length $self->{_tls_wbuf}) { |
1313 | if (length $self->{_tls_wbuf}) { |
1319 | while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) { |
1314 | while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) { |
1320 | substr $self->{_tls_wbuf}, 0, $len, ""; |
1315 | substr $self->{_tls_wbuf}, 0, $tmp, ""; |
1321 | } |
1316 | } |
1322 | } |
1317 | } |
1323 | |
1318 | |
1324 | while (defined ($buf = Net::SSLeay::read ($self->{tls}))) { |
1319 | while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) { |
1325 | unless (length $buf) { |
1320 | unless (length $tmp) { |
1326 | # let's treat SSL-eof as we treat normal EOF |
1321 | # let's treat SSL-eof as we treat normal EOF |
1327 | delete $self->{_rw}; |
1322 | delete $self->{_rw}; |
1328 | $self->{_eof} = 1; |
1323 | $self->{_eof} = 1; |
1329 | &_freetls; |
1324 | &_freetls; |
1330 | } |
1325 | } |
1331 | |
1326 | |
1332 | $self->{rbuf} .= $buf; |
1327 | $self->{rbuf} .= $tmp; |
1333 | $self->_drain_rbuf unless $self->{_in_drain}; |
1328 | $self->_drain_rbuf unless $self->{_in_drain}; |
1334 | $self->{tls} or return; # tls session might have gone away in callback |
1329 | $self->{tls} or return; # tls session might have gone away in callback |
1335 | } |
1330 | } |
1336 | |
1331 | |
1337 | my $err = Net::SSLeay::get_error ($self->{tls}, -1); |
1332 | $tmp = Net::SSLeay::get_error ($self->{tls}, -1); |
1338 | |
1333 | |
1339 | if ($err!= Net::SSLeay::ERROR_WANT_READ ()) { |
1334 | if ($tmp != Net::SSLeay::ERROR_WANT_READ ()) { |
1340 | if ($err == Net::SSLeay::ERROR_SYSCALL ()) { |
1335 | if ($tmp == Net::SSLeay::ERROR_SYSCALL ()) { |
1341 | return $self->_error ($!, 1); |
1336 | return $self->_error ($!, 1); |
1342 | } elsif ($err == Net::SSLeay::ERROR_SSL ()) { |
1337 | } elsif ($tmp == Net::SSLeay::ERROR_SSL ()) { |
1343 | return $self->_error (&Errno::EIO, 1); |
1338 | return $self->_error (&Errno::EIO, 1); |
1344 | } |
1339 | } |
1345 | |
1340 | |
1346 | # all others are fine for our purposes |
1341 | # all other errors are fine for our purposes |
1347 | } |
1342 | } |
1348 | |
1343 | |
1349 | while (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
1344 | while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
1350 | $self->{wbuf} .= $buf; |
1345 | $self->{wbuf} .= $tmp; |
1351 | $self->_drain_wbuf; |
1346 | $self->_drain_wbuf; |
1352 | } |
1347 | } |
1353 | } |
1348 | } |
1354 | |
1349 | |
1355 | =item $handle->starttls ($tls[, $tls_ctx]) |
1350 | =item $handle->starttls ($tls[, $tls_ctx]) |
… | |
… | |
1376 | sub starttls { |
1371 | sub starttls { |
1377 | my ($self, $ssl, $ctx) = @_; |
1372 | my ($self, $ssl, $ctx) = @_; |
1378 | |
1373 | |
1379 | require Net::SSLeay; |
1374 | require Net::SSLeay; |
1380 | |
1375 | |
1381 | Carp::croak "it is an error to call starttls more than once on an Anyevent::Handle object" |
1376 | Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object" |
1382 | if $self->{tls}; |
1377 | if $self->{tls}; |
1383 | |
1378 | |
1384 | if ($ssl eq "accept") { |
1379 | if ($ssl eq "accept") { |
1385 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
1380 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
1386 | Net::SSLeay::set_accept_state ($ssl); |
1381 | Net::SSLeay::set_accept_state ($ssl); |
… | |
… | |
1475 | @linger = (); |
1470 | @linger = (); |
1476 | }); |
1471 | }); |
1477 | } |
1472 | } |
1478 | } |
1473 | } |
1479 | |
1474 | |
|
|
1475 | =item $handle->destroy |
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1476 | |
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1477 | Shuts down the handle object as much as possible - this call ensures that |
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1478 | no further callbacks will be invoked and resources will be freed as much |
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1479 | as possible. You must not call any methods on the object afterwards. |
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1480 | |
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1481 | Normally, you can just "forget" any references to an AnyEvent::Handle |
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1482 | object and it will simply shut down. This works in fatal error and EOF |
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|
1483 | callbacks, as well as code outside. It does I<NOT> work in a read or write |
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1484 | callback, so when you want to destroy the AnyEvent::Handle object from |
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1485 | within such an callback. You I<MUST> call C<< ->destroy >> explicitly in |
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1486 | that case. |
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1487 | |
|
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1488 | The handle might still linger in the background and write out remaining |
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1489 | data, as specified by the C<linger> option, however. |
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1490 | |
|
|
1491 | =cut |
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1492 | |
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1493 | sub destroy { |
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1494 | my ($self) = @_; |
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1495 | |
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|
1496 | $self->DESTROY; |
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1497 | %$self = (); |
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|
1498 | } |
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1499 | |
1480 | =item AnyEvent::Handle::TLS_CTX |
1500 | =item AnyEvent::Handle::TLS_CTX |
1481 | |
1501 | |
1482 | This function creates and returns the Net::SSLeay::CTX object used by |
1502 | This function creates and returns the Net::SSLeay::CTX object used by |
1483 | default for TLS mode. |
1503 | default for TLS mode. |
1484 | |
1504 | |
… | |
… | |
1516 | |
1536 | |
1517 | |
1537 | |
1518 | =head1 NONFREQUENTLY ASKED QUESTIONS |
1538 | =head1 NONFREQUENTLY ASKED QUESTIONS |
1519 | |
1539 | |
1520 | =over 4 |
1540 | =over 4 |
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|
1541 | |
|
|
1542 | =item I C<undef> the AnyEvent::Handle reference inside my callback and |
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1543 | still get further invocations! |
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1544 | |
|
|
1545 | That's because AnyEvent::Handle keeps a reference to itself when handling |
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1546 | read or write callbacks. |
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|
1547 | |
|
|
1548 | It is only safe to "forget" the reference inside EOF or error callbacks, |
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1549 | from within all other callbacks, you need to explicitly call the C<< |
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1550 | ->destroy >> method. |
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1551 | |
|
|
1552 | =item I get different callback invocations in TLS mode/Why can't I pause |
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|
1553 | reading? |
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1554 | |
|
|
1555 | Unlike, say, TCP, TLS connections do not consist of two independent |
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1556 | communication channels, one for each direction. Or put differently. The |
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1557 | read and write directions are not independent of each other: you cannot |
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1558 | write data unless you are also prepared to read, and vice versa. |
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1559 | |
|
|
1560 | This can mean than, in TLS mode, you might get C<on_error> or C<on_eof> |
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1561 | callback invocations when you are not expecting any read data - the reason |
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1562 | is that AnyEvent::Handle always reads in TLS mode. |
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1563 | |
|
|
1564 | During the connection, you have to make sure that you always have a |
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1565 | non-empty read-queue, or an C<on_read> watcher. At the end of the |
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1566 | connection (or when you no longer want to use it) you can call the |
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1567 | C<destroy> method. |
1521 | |
1568 | |
1522 | =item How do I read data until the other side closes the connection? |
1569 | =item How do I read data until the other side closes the connection? |
1523 | |
1570 | |
1524 | If you just want to read your data into a perl scalar, the easiest way |
1571 | If you just want to read your data into a perl scalar, the easiest way |
1525 | to achieve this is by setting an C<on_read> callback that does nothing, |
1572 | to achieve this is by setting an C<on_read> callback that does nothing, |
… | |
… | |
1535 | |
1582 | |
1536 | The reason to use C<on_error> is that TCP connections, due to latencies |
1583 | The reason to use C<on_error> is that TCP connections, due to latencies |
1537 | and packets loss, might get closed quite violently with an error, when in |
1584 | and packets loss, might get closed quite violently with an error, when in |
1538 | fact, all data has been received. |
1585 | fact, all data has been received. |
1539 | |
1586 | |
1540 | It is usually better to use acknowledgements when transfering data, |
1587 | It is usually better to use acknowledgements when transferring data, |
1541 | to make sure the other side hasn't just died and you got the data |
1588 | to make sure the other side hasn't just died and you got the data |
1542 | intact. This is also one reason why so many internet protocols have an |
1589 | intact. This is also one reason why so many internet protocols have an |
1543 | explicit QUIT command. |
1590 | explicit QUIT command. |
1544 | |
|
|
1545 | |
1591 | |
1546 | =item I don't want to destroy the handle too early - how do I wait until |
1592 | =item I don't want to destroy the handle too early - how do I wait until |
1547 | all data has been written? |
1593 | all data has been written? |
1548 | |
1594 | |
1549 | After writing your last bits of data, set the C<on_drain> callback |
1595 | After writing your last bits of data, set the C<on_drain> callback |