… | |
… | |
11 | |
11 | |
12 | my $hdl; $hdl = new AnyEvent::Handle |
12 | my $hdl; $hdl = new AnyEvent::Handle |
13 | fh => \*STDIN, |
13 | fh => \*STDIN, |
14 | on_error => sub { |
14 | on_error => sub { |
15 | my ($hdl, $fatal, $msg) = @_; |
15 | my ($hdl, $fatal, $msg) = @_; |
16 | warn "got error $msg\n"; |
16 | AE::log error => $msg; |
17 | $hdl->destroy; |
17 | $hdl->destroy; |
18 | $cv->send; |
18 | $cv->send; |
19 | }; |
19 | }; |
20 | |
20 | |
21 | # send some request line |
21 | # send some request line |
22 | $hdl->push_write ("getinfo\015\012"); |
22 | $hdl->push_write ("getinfo\015\012"); |
23 | |
23 | |
24 | # read the response line |
24 | # read the response line |
25 | $hdl->push_read (line => sub { |
25 | $hdl->push_read (line => sub { |
26 | my ($hdl, $line) = @_; |
26 | my ($hdl, $line) = @_; |
27 | warn "got line <$line>\n"; |
27 | say "got line <$line>"; |
28 | $cv->send; |
28 | $cv->send; |
29 | }); |
29 | }); |
30 | |
30 | |
31 | $cv->recv; |
31 | $cv->recv; |
32 | |
32 | |
… | |
… | |
128 | =item on_connect => $cb->($handle, $host, $port, $retry->()) |
128 | =item on_connect => $cb->($handle, $host, $port, $retry->()) |
129 | |
129 | |
130 | This callback is called when a connection has been successfully established. |
130 | This callback is called when a connection has been successfully established. |
131 | |
131 | |
132 | The peer's numeric host and port (the socket peername) are passed as |
132 | The peer's numeric host and port (the socket peername) are passed as |
133 | parameters, together with a retry callback. |
133 | parameters, together with a retry callback. At the time it is called the |
|
|
134 | read and write queues, EOF status, TLS status and similar properties of |
|
|
135 | the handle will have been reset. |
134 | |
136 | |
|
|
137 | It is not allowed to use the read or write queues while the handle object |
|
|
138 | is connecting. |
|
|
139 | |
135 | If, for some reason, the handle is not acceptable, calling C<$retry> |
140 | If, for some reason, the handle is not acceptable, calling C<$retry> will |
136 | will continue with the next connection target (in case of multi-homed |
141 | continue with the next connection target (in case of multi-homed hosts or |
137 | hosts or SRV records there can be multiple connection endpoints). At the |
142 | SRV records there can be multiple connection endpoints). The C<$retry> |
138 | time it is called the read and write queues, eof status, tls status and |
143 | callback can be invoked after the connect callback returns, i.e. one can |
139 | similar properties of the handle will have been reset. |
144 | start a handshake and then decide to retry with the next host if the |
|
|
145 | handshake fails. |
140 | |
146 | |
141 | In most cases, you should ignore the C<$retry> parameter. |
147 | In most cases, you should ignore the C<$retry> parameter. |
142 | |
148 | |
143 | =item on_connect_error => $cb->($handle, $message) |
149 | =item on_connect_error => $cb->($handle, $message) |
144 | |
150 | |
… | |
… | |
164 | with active (but unsatisfiable) read watchers (C<EPIPE>) or I/O errors. In |
170 | with active (but unsatisfiable) read watchers (C<EPIPE>) or I/O errors. In |
165 | cases where the other side can close the connection at will, it is |
171 | cases where the other side can close the connection at will, it is |
166 | often easiest to not report C<EPIPE> errors in this callback. |
172 | often easiest to not report C<EPIPE> errors in this callback. |
167 | |
173 | |
168 | AnyEvent::Handle tries to find an appropriate error code for you to check |
174 | AnyEvent::Handle tries to find an appropriate error code for you to check |
169 | against, but in some cases (TLS errors), this does not work well. It is |
175 | against, but in some cases (TLS errors), this does not work well. |
170 | recommended to always output the C<$message> argument in human-readable |
176 | |
171 | error messages (it's usually the same as C<"$!">). |
177 | If you report the error to the user, it is recommended to always output |
|
|
178 | the C<$message> argument in human-readable error messages (you don't need |
|
|
179 | to report C<"$!"> if you report C<$message>). |
|
|
180 | |
|
|
181 | If you want to react programmatically to the error, then looking at C<$!> |
|
|
182 | and comparing it against some of the documented C<Errno> values is usually |
|
|
183 | better than looking at the C<$message>. |
172 | |
184 | |
173 | Non-fatal errors can be retried by returning, but it is recommended |
185 | Non-fatal errors can be retried by returning, but it is recommended |
174 | to simply ignore this parameter and instead abondon the handle object |
186 | to simply ignore this parameter and instead abondon the handle object |
175 | when this callback is invoked. Examples of non-fatal errors are timeouts |
187 | when this callback is invoked. Examples of non-fatal errors are timeouts |
176 | C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>). |
188 | C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>). |
… | |
… | |
224 | If an EOF condition has been detected but no C<on_eof> callback has been |
236 | If an EOF condition has been detected but no C<on_eof> callback has been |
225 | set, then a fatal error will be raised with C<$!> set to <0>. |
237 | set, then a fatal error will be raised with C<$!> set to <0>. |
226 | |
238 | |
227 | =item on_drain => $cb->($handle) |
239 | =item on_drain => $cb->($handle) |
228 | |
240 | |
229 | This sets the callback that is called when the write buffer becomes empty |
241 | This sets the callback that is called once when the write buffer becomes |
230 | (or immediately if the buffer is empty already). |
242 | empty (and immediately when the handle object is created). |
231 | |
243 | |
232 | To append to the write buffer, use the C<< ->push_write >> method. |
244 | To append to the write buffer, use the C<< ->push_write >> method. |
233 | |
245 | |
234 | This callback is useful when you don't want to put all of your write data |
246 | This callback is useful when you don't want to put all of your write data |
235 | into the queue at once, for example, when you want to write the contents |
247 | into the queue at once, for example, when you want to write the contents |
… | |
… | |
359 | already have occured on BSD systems), but at least it will protect you |
371 | already have occured on BSD systems), but at least it will protect you |
360 | from most attacks. |
372 | from most attacks. |
361 | |
373 | |
362 | =item read_size => <bytes> |
374 | =item read_size => <bytes> |
363 | |
375 | |
364 | The initial read block size, the number of bytes this module will try to |
376 | The initial read block size, the number of bytes this module will try |
365 | read during each loop iteration. Each handle object will consume at least |
377 | to read during each loop iteration. Each handle object will consume |
366 | this amount of memory for the read buffer as well, so when handling many |
378 | at least this amount of memory for the read buffer as well, so when |
367 | connections requirements). See also C<max_read_size>. Default: C<2048>. |
379 | handling many connections watch out for memory requirements). See also |
|
|
380 | C<max_read_size>. Default: C<2048>. |
368 | |
381 | |
369 | =item max_read_size => <bytes> |
382 | =item max_read_size => <bytes> |
370 | |
383 | |
371 | The maximum read buffer size used by the dynamic adjustment |
384 | The maximum read buffer size used by the dynamic adjustment |
372 | algorithm: Each time AnyEvent::Handle can read C<read_size> bytes in |
385 | algorithm: Each time AnyEvent::Handle can read C<read_size> bytes in |
… | |
… | |
416 | appropriate error message. |
429 | appropriate error message. |
417 | |
430 | |
418 | TLS mode requires Net::SSLeay to be installed (it will be loaded |
431 | TLS mode requires Net::SSLeay to be installed (it will be loaded |
419 | automatically when you try to create a TLS handle): this module doesn't |
432 | automatically when you try to create a TLS handle): this module doesn't |
420 | have a dependency on that module, so if your module requires it, you have |
433 | have a dependency on that module, so if your module requires it, you have |
421 | to add the dependency yourself. |
434 | to add the dependency yourself. If Net::SSLeay cannot be loaded or is too |
|
|
435 | old, you get an C<EPROTO> error. |
422 | |
436 | |
423 | Unlike TCP, TLS has a server and client side: for the TLS server side, use |
437 | Unlike TCP, TLS has a server and client side: for the TLS server side, use |
424 | C<accept>, and for the TLS client side of a connection, use C<connect> |
438 | C<accept>, and for the TLS client side of a connection, use C<connect> |
425 | mode. |
439 | mode. |
426 | |
440 | |
… | |
… | |
482 | callback. |
496 | callback. |
483 | |
497 | |
484 | This callback will only be called on TLS shutdowns, not when the |
498 | This callback will only be called on TLS shutdowns, not when the |
485 | underlying handle signals EOF. |
499 | underlying handle signals EOF. |
486 | |
500 | |
487 | =item json => JSON or JSON::XS object |
501 | =item json => L<JSON> or L<JSON::XS> object |
488 | |
502 | |
489 | This is the json coder object used by the C<json> read and write types. |
503 | This is the json coder object used by the C<json> read and write types. |
490 | |
504 | |
491 | If you don't supply it, then AnyEvent::Handle will create and use a |
505 | If you don't supply it, then AnyEvent::Handle will create and use a |
492 | suitable one (on demand), which will write and expect UTF-8 encoded JSON |
506 | suitable one (on demand), which will write and expect UTF-8 encoded JSON |
493 | texts. |
507 | texts. |
494 | |
508 | |
495 | Note that you are responsible to depend on the JSON module if you want to |
509 | Note that you are responsible to depend on the L<JSON> module if you want |
496 | use this functionality, as AnyEvent does not have a dependency itself. |
510 | to use this functionality, as AnyEvent does not have a dependency on it |
|
|
511 | itself. |
|
|
512 | |
|
|
513 | =item cbor => L<CBOR::XS> object |
|
|
514 | |
|
|
515 | This is the cbor coder object used by the C<cbor> read and write types. |
|
|
516 | |
|
|
517 | If you don't supply it, then AnyEvent::Handle will create and use a |
|
|
518 | suitable one (on demand), which will write CBOR without using extensions, |
|
|
519 | if possible. texts. |
|
|
520 | |
|
|
521 | Note that you are responsible to depend on the L<CBOR::XS> module if you |
|
|
522 | want to use this functionality, as AnyEvent does not have a dependency on |
|
|
523 | it itself. |
497 | |
524 | |
498 | =back |
525 | =back |
499 | |
526 | |
500 | =cut |
527 | =cut |
501 | |
528 | |
… | |
… | |
879 | |
906 | |
880 | The write queue is very simple: you can add data to its end, and |
907 | The write queue is very simple: you can add data to its end, and |
881 | AnyEvent::Handle will automatically try to get rid of it for you. |
908 | AnyEvent::Handle will automatically try to get rid of it for you. |
882 | |
909 | |
883 | When data could be written and the write buffer is shorter then the low |
910 | When data could be written and the write buffer is shorter then the low |
884 | water mark, the C<on_drain> callback will be invoked. |
911 | water mark, the C<on_drain> callback will be invoked once. |
885 | |
912 | |
886 | =over 4 |
913 | =over 4 |
887 | |
914 | |
888 | =item $handle->on_drain ($cb) |
915 | =item $handle->on_drain ($cb) |
889 | |
916 | |
… | |
… | |
1039 | |
1066 | |
1040 | The generated JSON text is guaranteed not to contain any newlines: While |
1067 | The generated JSON text is guaranteed not to contain any newlines: While |
1041 | this module doesn't need delimiters after or between JSON texts to be |
1068 | this module doesn't need delimiters after or between JSON texts to be |
1042 | able to read them, many other languages depend on that. |
1069 | able to read them, many other languages depend on that. |
1043 | |
1070 | |
1044 | A simple RPC protocol that interoperates easily with others is to send |
1071 | A simple RPC protocol that interoperates easily with other languages is |
1045 | JSON arrays (or objects, although arrays are usually the better choice as |
1072 | to send JSON arrays (or objects, although arrays are usually the better |
1046 | they mimic how function argument passing works) and a newline after each |
1073 | choice as they mimic how function argument passing works) and a newline |
1047 | JSON text: |
1074 | after each JSON text: |
1048 | |
1075 | |
1049 | $handle->push_write (json => ["method", "arg1", "arg2"]); # whatever |
1076 | $handle->push_write (json => ["method", "arg1", "arg2"]); # whatever |
1050 | $handle->push_write ("\012"); |
1077 | $handle->push_write ("\012"); |
1051 | |
1078 | |
1052 | An AnyEvent::Handle receiver would simply use the C<json> read type and |
1079 | An AnyEvent::Handle receiver would simply use the C<json> read type and |
… | |
… | |
1055 | $handle->push_read (json => sub { my $array = $_[1]; ... }); |
1082 | $handle->push_read (json => sub { my $array = $_[1]; ... }); |
1056 | |
1083 | |
1057 | Other languages could read single lines terminated by a newline and pass |
1084 | Other languages could read single lines terminated by a newline and pass |
1058 | this line into their JSON decoder of choice. |
1085 | this line into their JSON decoder of choice. |
1059 | |
1086 | |
|
|
1087 | =item cbor => $perl_scalar |
|
|
1088 | |
|
|
1089 | Encodes the given scalar into a CBOR value. Unless you provide your own |
|
|
1090 | L<CBOR::XS> object, this means it will be encoded to a CBOR string not |
|
|
1091 | using any extensions, if possible. |
|
|
1092 | |
|
|
1093 | CBOR values are self-delimiting, so you can write CBOR at one end of |
|
|
1094 | a handle and read them at the other end without using any additional |
|
|
1095 | framing. |
|
|
1096 | |
|
|
1097 | A simple nd very very fast RPC protocol that interoperates with |
|
|
1098 | other languages is to send CBOR and receive CBOR values (arrays are |
|
|
1099 | recommended): |
|
|
1100 | |
|
|
1101 | $handle->push_write (cbor => ["method", "arg1", "arg2"]); # whatever |
|
|
1102 | |
|
|
1103 | An AnyEvent::Handle receiver would simply use the C<cbor> read type: |
|
|
1104 | |
|
|
1105 | $handle->push_read (cbor => sub { my $array = $_[1]; ... }); |
|
|
1106 | |
1060 | =cut |
1107 | =cut |
1061 | |
1108 | |
1062 | sub json_coder() { |
1109 | sub json_coder() { |
1063 | eval { require JSON::XS; JSON::XS->new->utf8 } |
1110 | eval { require JSON::XS; JSON::XS->new->utf8 } |
1064 | || do { require JSON; JSON->new->utf8 } |
1111 | || do { require JSON; JSON->new->utf8 } |
1065 | } |
1112 | } |
1066 | |
1113 | |
1067 | register_write_type json => sub { |
1114 | register_write_type json => sub { |
1068 | my ($self, $ref) = @_; |
1115 | my ($self, $ref) = @_; |
1069 | |
1116 | |
1070 | my $json = $self->{json} ||= json_coder; |
1117 | ($self->{json} ||= json_coder) |
1071 | |
|
|
1072 | $json->encode ($ref) |
1118 | ->encode ($ref) |
|
|
1119 | }; |
|
|
1120 | |
|
|
1121 | sub cbor_coder() { |
|
|
1122 | require CBOR::XS; |
|
|
1123 | CBOR::XS->new |
|
|
1124 | } |
|
|
1125 | |
|
|
1126 | register_write_type cbor => sub { |
|
|
1127 | my ($self, $scalar) = @_; |
|
|
1128 | |
|
|
1129 | ($self->{cbor} ||= cbor_coder) |
|
|
1130 | ->encode ($scalar) |
1073 | }; |
1131 | }; |
1074 | |
1132 | |
1075 | =item storable => $reference |
1133 | =item storable => $reference |
1076 | |
1134 | |
1077 | Freezes the given reference using L<Storable> and writes it to the |
1135 | Freezes the given reference using L<Storable> and writes it to the |
… | |
… | |
1080 | =cut |
1138 | =cut |
1081 | |
1139 | |
1082 | register_write_type storable => sub { |
1140 | register_write_type storable => sub { |
1083 | my ($self, $ref) = @_; |
1141 | my ($self, $ref) = @_; |
1084 | |
1142 | |
1085 | require Storable; |
1143 | require Storable unless $Storable::VERSION; |
1086 | |
1144 | |
1087 | pack "w/a*", Storable::nfreeze ($ref) |
1145 | pack "w/a*", Storable::nfreeze ($ref) |
1088 | }; |
1146 | }; |
1089 | |
1147 | |
1090 | =back |
1148 | =back |
… | |
… | |
1127 | |
1185 | |
1128 | Whenever the given C<type> is used, C<push_write> will the function with |
1186 | Whenever the given C<type> is used, C<push_write> will the function with |
1129 | the handle object and the remaining arguments. |
1187 | the handle object and the remaining arguments. |
1130 | |
1188 | |
1131 | The function is supposed to return a single octet string that will be |
1189 | The function is supposed to return a single octet string that will be |
1132 | appended to the write buffer, so you cna mentally treat this function as a |
1190 | appended to the write buffer, so you can mentally treat this function as a |
1133 | "arguments to on-the-wire-format" converter. |
1191 | "arguments to on-the-wire-format" converter. |
1134 | |
1192 | |
1135 | Example: implement a custom write type C<join> that joins the remaining |
1193 | Example: implement a custom write type C<join> that joins the remaining |
1136 | arguments using the first one. |
1194 | arguments using the first one. |
1137 | |
1195 | |
… | |
… | |
1431 | data. |
1489 | data. |
1432 | |
1490 | |
1433 | Example: read 2 bytes. |
1491 | Example: read 2 bytes. |
1434 | |
1492 | |
1435 | $handle->push_read (chunk => 2, sub { |
1493 | $handle->push_read (chunk => 2, sub { |
1436 | warn "yay ", unpack "H*", $_[1]; |
1494 | say "yay " . unpack "H*", $_[1]; |
1437 | }); |
1495 | }); |
1438 | |
1496 | |
1439 | =cut |
1497 | =cut |
1440 | |
1498 | |
1441 | register_read_type chunk => sub { |
1499 | register_read_type chunk => sub { |
… | |
… | |
1471 | |
1529 | |
1472 | register_read_type line => sub { |
1530 | register_read_type line => sub { |
1473 | my ($self, $cb, $eol) = @_; |
1531 | my ($self, $cb, $eol) = @_; |
1474 | |
1532 | |
1475 | if (@_ < 3) { |
1533 | if (@_ < 3) { |
1476 | # this is more than twice as fast as the generic code below |
1534 | # this is faster then the generic code below |
1477 | sub { |
1535 | sub { |
1478 | $_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return; |
1536 | (my $pos = index $_[0]{rbuf}, "\012") >= 0 |
|
|
1537 | or return; |
1479 | |
1538 | |
|
|
1539 | (my $str = substr $_[0]{rbuf}, 0, $pos + 1, "") =~ s/(\015?\012)\Z// or die; |
1480 | $cb->($_[0], $1, $2); |
1540 | $cb->($_[0], $str, "$1"); |
1481 | 1 |
1541 | 1 |
1482 | } |
1542 | } |
1483 | } else { |
1543 | } else { |
1484 | $eol = quotemeta $eol unless ref $eol; |
1544 | $eol = quotemeta $eol unless ref $eol; |
1485 | $eol = qr|^(.*?)($eol)|s; |
1545 | $eol = qr|^(.*?)($eol)|s; |
1486 | |
1546 | |
1487 | sub { |
1547 | sub { |
1488 | $_[0]{rbuf} =~ s/$eol// or return; |
1548 | $_[0]{rbuf} =~ s/$eol// or return; |
1489 | |
1549 | |
1490 | $cb->($_[0], $1, $2); |
1550 | $cb->($_[0], "$1", "$2"); |
1491 | 1 |
1551 | 1 |
1492 | } |
1552 | } |
1493 | } |
1553 | } |
1494 | }; |
1554 | }; |
1495 | |
1555 | |
… | |
… | |
1543 | |
1603 | |
1544 | sub { |
1604 | sub { |
1545 | # accept |
1605 | # accept |
1546 | if ($$rbuf =~ $accept) { |
1606 | if ($$rbuf =~ $accept) { |
1547 | $data .= substr $$rbuf, 0, $+[0], ""; |
1607 | $data .= substr $$rbuf, 0, $+[0], ""; |
1548 | $cb->($self, $data); |
1608 | $cb->($_[0], $data); |
1549 | return 1; |
1609 | return 1; |
1550 | } |
1610 | } |
1551 | |
1611 | |
1552 | # reject |
1612 | # reject |
1553 | if ($reject && $$rbuf =~ $reject) { |
1613 | if ($reject && $$rbuf =~ $reject) { |
1554 | $self->_error (Errno::EBADMSG); |
1614 | $_[0]->_error (Errno::EBADMSG); |
1555 | } |
1615 | } |
1556 | |
1616 | |
1557 | # skip |
1617 | # skip |
1558 | if ($skip && $$rbuf =~ $skip) { |
1618 | if ($skip && $$rbuf =~ $skip) { |
1559 | $data .= substr $$rbuf, 0, $+[0], ""; |
1619 | $data .= substr $$rbuf, 0, $+[0], ""; |
… | |
… | |
1575 | my ($self, $cb) = @_; |
1635 | my ($self, $cb) = @_; |
1576 | |
1636 | |
1577 | sub { |
1637 | sub { |
1578 | unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) { |
1638 | unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) { |
1579 | if ($_[0]{rbuf} =~ /[^0-9]/) { |
1639 | if ($_[0]{rbuf} =~ /[^0-9]/) { |
1580 | $self->_error (Errno::EBADMSG); |
1640 | $_[0]->_error (Errno::EBADMSG); |
1581 | } |
1641 | } |
1582 | return; |
1642 | return; |
1583 | } |
1643 | } |
1584 | |
1644 | |
1585 | my $len = $1; |
1645 | my $len = $1; |
1586 | |
1646 | |
1587 | $self->unshift_read (chunk => $len, sub { |
1647 | $_[0]->unshift_read (chunk => $len, sub { |
1588 | my $string = $_[1]; |
1648 | my $string = $_[1]; |
1589 | $_[0]->unshift_read (chunk => 1, sub { |
1649 | $_[0]->unshift_read (chunk => 1, sub { |
1590 | if ($_[1] eq ",") { |
1650 | if ($_[1] eq ",") { |
1591 | $cb->($_[0], $string); |
1651 | $cb->($_[0], $string); |
1592 | } else { |
1652 | } else { |
1593 | $self->_error (Errno::EBADMSG); |
1653 | $_[0]->_error (Errno::EBADMSG); |
1594 | } |
1654 | } |
1595 | }); |
1655 | }); |
1596 | }); |
1656 | }); |
1597 | |
1657 | |
1598 | 1 |
1658 | 1 |
… | |
… | |
1668 | my ($self, $cb) = @_; |
1728 | my ($self, $cb) = @_; |
1669 | |
1729 | |
1670 | my $json = $self->{json} ||= json_coder; |
1730 | my $json = $self->{json} ||= json_coder; |
1671 | |
1731 | |
1672 | my $data; |
1732 | my $data; |
1673 | my $rbuf = \$self->{rbuf}; |
|
|
1674 | |
1733 | |
1675 | sub { |
1734 | sub { |
1676 | my $ref = eval { $json->incr_parse ($self->{rbuf}) }; |
1735 | my $ref = eval { $json->incr_parse ($_[0]{rbuf}) }; |
1677 | |
1736 | |
1678 | if ($ref) { |
1737 | if ($ref) { |
1679 | $self->{rbuf} = $json->incr_text; |
1738 | $_[0]{rbuf} = $json->incr_text; |
1680 | $json->incr_text = ""; |
1739 | $json->incr_text = ""; |
1681 | $cb->($self, $ref); |
1740 | $cb->($_[0], $ref); |
1682 | |
1741 | |
1683 | 1 |
1742 | 1 |
1684 | } elsif ($@) { |
1743 | } elsif ($@) { |
1685 | # error case |
1744 | # error case |
1686 | $json->incr_skip; |
1745 | $json->incr_skip; |
1687 | |
1746 | |
1688 | $self->{rbuf} = $json->incr_text; |
1747 | $_[0]{rbuf} = $json->incr_text; |
1689 | $json->incr_text = ""; |
1748 | $json->incr_text = ""; |
1690 | |
1749 | |
1691 | $self->_error (Errno::EBADMSG); |
1750 | $_[0]->_error (Errno::EBADMSG); |
1692 | |
1751 | |
1693 | () |
1752 | () |
1694 | } else { |
1753 | } else { |
1695 | $self->{rbuf} = ""; |
1754 | $_[0]{rbuf} = ""; |
1696 | |
1755 | |
|
|
1756 | () |
|
|
1757 | } |
|
|
1758 | } |
|
|
1759 | }; |
|
|
1760 | |
|
|
1761 | =item cbor => $cb->($handle, $scalar) |
|
|
1762 | |
|
|
1763 | Reads a CBOR value, decodes it and passes it to the callback. When a parse |
|
|
1764 | error occurs, an C<EBADMSG> error will be raised. |
|
|
1765 | |
|
|
1766 | If a L<CBOR::XS> object was passed to the constructor, then that will be |
|
|
1767 | used for the final decode, otherwise it will create a CBOR coder without |
|
|
1768 | enabling any options. |
|
|
1769 | |
|
|
1770 | You have to provide a dependency to L<CBOR::XS> on your own: this module |
|
|
1771 | will load the L<CBOR::XS> module, but AnyEvent does not depend on it |
|
|
1772 | itself. |
|
|
1773 | |
|
|
1774 | Since CBOR values are fully self-delimiting, the C<cbor> read and write |
|
|
1775 | types are an ideal simple RPC protocol: just exchange CBOR datagrams. See |
|
|
1776 | the C<cbor> write type description, above, for an actual example. |
|
|
1777 | |
|
|
1778 | =cut |
|
|
1779 | |
|
|
1780 | register_read_type cbor => sub { |
|
|
1781 | my ($self, $cb) = @_; |
|
|
1782 | |
|
|
1783 | my $cbor = $self->{cbor} ||= cbor_coder; |
|
|
1784 | |
|
|
1785 | my $data; |
|
|
1786 | |
|
|
1787 | sub { |
|
|
1788 | my (@value) = eval { $cbor->incr_parse ($_[0]{rbuf}) }; |
|
|
1789 | |
|
|
1790 | if (@value) { |
|
|
1791 | $cb->($_[0], @value); |
|
|
1792 | |
|
|
1793 | 1 |
|
|
1794 | } elsif ($@) { |
|
|
1795 | # error case |
|
|
1796 | $cbor->incr_reset; |
|
|
1797 | |
|
|
1798 | $_[0]->_error (Errno::EBADMSG); |
|
|
1799 | |
|
|
1800 | () |
|
|
1801 | } else { |
1697 | () |
1802 | () |
1698 | } |
1803 | } |
1699 | } |
1804 | } |
1700 | }; |
1805 | }; |
1701 | |
1806 | |
… | |
… | |
1710 | =cut |
1815 | =cut |
1711 | |
1816 | |
1712 | register_read_type storable => sub { |
1817 | register_read_type storable => sub { |
1713 | my ($self, $cb) = @_; |
1818 | my ($self, $cb) = @_; |
1714 | |
1819 | |
1715 | require Storable; |
1820 | require Storable unless $Storable::VERSION; |
1716 | |
1821 | |
1717 | sub { |
1822 | sub { |
1718 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
1823 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
1719 | defined (my $len = eval { unpack "w", $_[0]{rbuf} }) |
1824 | defined (my $len = eval { unpack "w", $_[0]{rbuf} }) |
1720 | or return; |
1825 | or return; |
… | |
… | |
1723 | |
1828 | |
1724 | # bypass unshift if we already have the remaining chunk |
1829 | # bypass unshift if we already have the remaining chunk |
1725 | if ($format + $len <= length $_[0]{rbuf}) { |
1830 | if ($format + $len <= length $_[0]{rbuf}) { |
1726 | my $data = substr $_[0]{rbuf}, $format, $len; |
1831 | my $data = substr $_[0]{rbuf}, $format, $len; |
1727 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
1832 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
|
|
1833 | |
1728 | $cb->($_[0], Storable::thaw ($data)); |
1834 | eval { $cb->($_[0], Storable::thaw ($data)); 1 } |
|
|
1835 | or return $_[0]->_error (Errno::EBADMSG); |
1729 | } else { |
1836 | } else { |
1730 | # remove prefix |
1837 | # remove prefix |
1731 | substr $_[0]{rbuf}, 0, $format, ""; |
1838 | substr $_[0]{rbuf}, 0, $format, ""; |
1732 | |
1839 | |
1733 | # read remaining chunk |
1840 | # read remaining chunk |
1734 | $_[0]->unshift_read (chunk => $len, sub { |
1841 | $_[0]->unshift_read (chunk => $len, sub { |
1735 | if (my $ref = eval { Storable::thaw ($_[1]) }) { |
1842 | eval { $cb->($_[0], Storable::thaw ($_[1])); 1 } |
1736 | $cb->($_[0], $ref); |
|
|
1737 | } else { |
|
|
1738 | $self->_error (Errno::EBADMSG); |
1843 | or $_[0]->_error (Errno::EBADMSG); |
1739 | } |
|
|
1740 | }); |
1844 | }); |
1741 | } |
1845 | } |
1742 | |
1846 | |
1743 | 1 |
1847 | 1 |
1744 | } |
1848 | } |
|
|
1849 | }; |
|
|
1850 | |
|
|
1851 | =item tls_detect => $cb->($handle, $detect, $major, $minor) |
|
|
1852 | |
|
|
1853 | Checks the input stream for a valid SSL or TLS handshake TLSPaintext |
|
|
1854 | record without consuming anything. Only SSL version 3 or higher |
|
|
1855 | is handled, up to the fictituous protocol 4.x (but both SSL3+ and |
|
|
1856 | SSL2-compatible framing is supported). |
|
|
1857 | |
|
|
1858 | If it detects that the input data is likely TLS, it calls the callback |
|
|
1859 | with a true value for C<$detect> and the (on-wire) TLS version as second |
|
|
1860 | and third argument (C<$major> is C<3>, and C<$minor> is 0..3 for SSL |
|
|
1861 | 3.0, TLS 1.0, 1.1 and 1.2, respectively). If it detects the input to |
|
|
1862 | be definitely not TLS, it calls the callback with a false value for |
|
|
1863 | C<$detect>. |
|
|
1864 | |
|
|
1865 | The callback could use this information to decide whether or not to start |
|
|
1866 | TLS negotiation. |
|
|
1867 | |
|
|
1868 | In all cases the data read so far is passed to the following read |
|
|
1869 | handlers. |
|
|
1870 | |
|
|
1871 | Usually you want to use the C<tls_autostart> read type instead. |
|
|
1872 | |
|
|
1873 | If you want to design a protocol that works in the presence of TLS |
|
|
1874 | dtection, make sure that any non-TLS data doesn't start with the octet 22 |
|
|
1875 | (ASCII SYN, 16 hex) or 128-255 (i.e. highest bit set). The checks this |
|
|
1876 | read type does are a bit more strict, but might losen in the future to |
|
|
1877 | accomodate protocol changes. |
|
|
1878 | |
|
|
1879 | This read type does not rely on L<AnyEvent::TLS> (and thus, not on |
|
|
1880 | L<Net::SSLeay>). |
|
|
1881 | |
|
|
1882 | =item tls_autostart => $tls[, $tls_ctx] |
|
|
1883 | |
|
|
1884 | Tries to detect a valid SSL or TLS handshake. If one is detected, it tries |
|
|
1885 | to start tls by calling C<starttls> with the given arguments. |
|
|
1886 | |
|
|
1887 | In practise, C<$tls> must be C<accept>, or a Net::SSLeay context that has |
|
|
1888 | been configured to accept, as servers do not normally send a handshake on |
|
|
1889 | their own and ths cannot be detected in this way. |
|
|
1890 | |
|
|
1891 | See C<tls_detect> above for more details. |
|
|
1892 | |
|
|
1893 | Example: give the client a chance to start TLS before accepting a text |
|
|
1894 | line. |
|
|
1895 | |
|
|
1896 | $hdl->push_read (tls_detect => "accept"); |
|
|
1897 | $hdl->push_read (line => sub { |
|
|
1898 | print "received ", ($_[0]{tls} ? "encrypted" : "cleartext"), " <$_[1]>\n"; |
|
|
1899 | }); |
|
|
1900 | |
|
|
1901 | =cut |
|
|
1902 | |
|
|
1903 | register_read_type tls_detect => sub { |
|
|
1904 | my ($self, $cb) = @_; |
|
|
1905 | |
|
|
1906 | sub { |
|
|
1907 | # this regex matches a full or partial tls record |
|
|
1908 | if ( |
|
|
1909 | # ssl3+: type(22=handshake) major(=3) minor(any) length_hi |
|
|
1910 | $self->{rbuf} =~ /^(?:\z| \x16 (\z| [\x03\x04] (?:\z| . (?:\z| [\x00-\x40] ))))/xs |
|
|
1911 | # ssl2 comapatible: len_hi len_lo type(1) major minor dummy(forlength) |
|
|
1912 | or $self->{rbuf} =~ /^(?:\z| [\x80-\xff] (?:\z| . (?:\z| \x01 (\z| [\x03\x04] (?:\z| . (?:\z| . ))))))/xs |
|
|
1913 | ) { |
|
|
1914 | return if 3 != length $1; # partial match, can't decide yet |
|
|
1915 | |
|
|
1916 | # full match, valid TLS record |
|
|
1917 | my ($major, $minor) = unpack "CC", $1; |
|
|
1918 | $cb->($self, "accept", $major + $minor * 0.1); |
|
|
1919 | } else { |
|
|
1920 | # mismatch == guaranteed not TLS |
|
|
1921 | $cb->($self, undef); |
|
|
1922 | } |
|
|
1923 | |
|
|
1924 | 1 |
|
|
1925 | } |
|
|
1926 | }; |
|
|
1927 | |
|
|
1928 | register_read_type tls_autostart => sub { |
|
|
1929 | my ($self, @tls) = @_; |
|
|
1930 | |
|
|
1931 | $RH{tls_detect}($self, sub { |
|
|
1932 | return unless $_[1]; |
|
|
1933 | $_[0]->starttls (@tls); |
|
|
1934 | }) |
1745 | }; |
1935 | }; |
1746 | |
1936 | |
1747 | =back |
1937 | =back |
1748 | |
1938 | |
1749 | =item custom read types - Package::anyevent_read_type $handle, $cb, @args |
1939 | =item custom read types - Package::anyevent_read_type $handle, $cb, @args |
… | |
… | |
1791 | some readings of the the SSL/TLS specifications basically require this |
1981 | some readings of the the SSL/TLS specifications basically require this |
1792 | attack to be working, as SSL/TLS implementations might stall sending data |
1982 | attack to be working, as SSL/TLS implementations might stall sending data |
1793 | during a rehandshake. |
1983 | during a rehandshake. |
1794 | |
1984 | |
1795 | As a guideline, during the initial handshake, you should not stop reading, |
1985 | As a guideline, during the initial handshake, you should not stop reading, |
1796 | and as a client, it might cause problems, depending on your applciation. |
1986 | and as a client, it might cause problems, depending on your application. |
1797 | |
1987 | |
1798 | =cut |
1988 | =cut |
1799 | |
1989 | |
1800 | sub stop_read { |
1990 | sub stop_read { |
1801 | my ($self) = @_; |
1991 | my ($self) = @_; |
… | |
… | |
1849 | my ($self, $err) = @_; |
2039 | my ($self, $err) = @_; |
1850 | |
2040 | |
1851 | return $self->_error ($!, 1) |
2041 | return $self->_error ($!, 1) |
1852 | if $err == Net::SSLeay::ERROR_SYSCALL (); |
2042 | if $err == Net::SSLeay::ERROR_SYSCALL (); |
1853 | |
2043 | |
1854 | my $err =Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ()); |
2044 | my $err = Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ()); |
1855 | |
2045 | |
1856 | # reduce error string to look less scary |
2046 | # reduce error string to look less scary |
1857 | $err =~ s/^error:[0-9a-fA-F]{8}:[^:]+:([^:]+):/\L$1: /; |
2047 | $err =~ s/^error:[0-9a-fA-F]{8}:[^:]+:([^:]+):/\L$1: /; |
1858 | |
2048 | |
1859 | if ($self->{_on_starttls}) { |
2049 | if ($self->{_on_starttls}) { |
… | |
… | |
1873 | sub _dotls { |
2063 | sub _dotls { |
1874 | my ($self) = @_; |
2064 | my ($self) = @_; |
1875 | |
2065 | |
1876 | my $tmp; |
2066 | my $tmp; |
1877 | |
2067 | |
1878 | if (length $self->{_tls_wbuf}) { |
2068 | while (length $self->{_tls_wbuf}) { |
1879 | while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) { |
2069 | if (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) <= 0) { |
1880 | substr $self->{_tls_wbuf}, 0, $tmp, ""; |
2070 | $tmp = Net::SSLeay::get_error ($self->{tls}, $tmp); |
|
|
2071 | |
|
|
2072 | return $self->_tls_error ($tmp) |
|
|
2073 | if $tmp != $ERROR_WANT_READ |
|
|
2074 | && ($tmp != $ERROR_SYSCALL || $!); |
|
|
2075 | |
|
|
2076 | last; |
1881 | } |
2077 | } |
1882 | |
2078 | |
1883 | $tmp = Net::SSLeay::get_error ($self->{tls}, $tmp); |
2079 | substr $self->{_tls_wbuf}, 0, $tmp, ""; |
1884 | return $self->_tls_error ($tmp) |
|
|
1885 | if $tmp != $ERROR_WANT_READ |
|
|
1886 | && ($tmp != $ERROR_SYSCALL || $!); |
|
|
1887 | } |
2080 | } |
1888 | |
2081 | |
1889 | while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) { |
2082 | while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) { |
1890 | unless (length $tmp) { |
2083 | unless (length $tmp) { |
1891 | $self->{_on_starttls} |
2084 | $self->{_on_starttls} |
… | |
… | |
1905 | $self->{_tls_rbuf} .= $tmp; |
2098 | $self->{_tls_rbuf} .= $tmp; |
1906 | $self->_drain_rbuf; |
2099 | $self->_drain_rbuf; |
1907 | $self->{tls} or return; # tls session might have gone away in callback |
2100 | $self->{tls} or return; # tls session might have gone away in callback |
1908 | } |
2101 | } |
1909 | |
2102 | |
1910 | $tmp = Net::SSLeay::get_error ($self->{tls}, -1); |
2103 | $tmp = Net::SSLeay::get_error ($self->{tls}, -1); # -1 is not neccessarily correct, but Net::SSLeay doesn't tell us |
1911 | return $self->_tls_error ($tmp) |
2104 | return $self->_tls_error ($tmp) |
1912 | if $tmp != $ERROR_WANT_READ |
2105 | if $tmp != $ERROR_WANT_READ |
1913 | && ($tmp != $ERROR_SYSCALL || $!); |
2106 | && ($tmp != $ERROR_SYSCALL || $!); |
1914 | |
2107 | |
1915 | while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
2108 | while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
… | |
… | |
1925 | |
2118 | |
1926 | =item $handle->starttls ($tls[, $tls_ctx]) |
2119 | =item $handle->starttls ($tls[, $tls_ctx]) |
1927 | |
2120 | |
1928 | Instead of starting TLS negotiation immediately when the AnyEvent::Handle |
2121 | Instead of starting TLS negotiation immediately when the AnyEvent::Handle |
1929 | object is created, you can also do that at a later time by calling |
2122 | object is created, you can also do that at a later time by calling |
1930 | C<starttls>. |
2123 | C<starttls>. See the C<tls> constructor argument for general info. |
1931 | |
2124 | |
1932 | Starting TLS is currently an asynchronous operation - when you push some |
2125 | Starting TLS is currently an asynchronous operation - when you push some |
1933 | write data and then call C<< ->starttls >> then TLS negotiation will start |
2126 | write data and then call C<< ->starttls >> then TLS negotiation will start |
1934 | immediately, after which the queued write data is then sent. |
2127 | immediately, after which the queued write data is then sent. This might |
|
|
2128 | change in future versions, so best make sure you have no outstanding write |
|
|
2129 | data when calling this method. |
1935 | |
2130 | |
1936 | The first argument is the same as the C<tls> constructor argument (either |
2131 | The first argument is the same as the C<tls> constructor argument (either |
1937 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
2132 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
1938 | |
2133 | |
1939 | The second argument is the optional C<AnyEvent::TLS> object that is used |
2134 | The second argument is the optional C<AnyEvent::TLS> object that is used |
… | |
… | |
1961 | my ($self, $tls, $ctx) = @_; |
2156 | my ($self, $tls, $ctx) = @_; |
1962 | |
2157 | |
1963 | Carp::croak "It is an error to call starttls on an AnyEvent::Handle object while TLS is already active, caught" |
2158 | Carp::croak "It is an error to call starttls on an AnyEvent::Handle object while TLS is already active, caught" |
1964 | if $self->{tls}; |
2159 | if $self->{tls}; |
1965 | |
2160 | |
|
|
2161 | unless (defined $AnyEvent::TLS::VERSION) { |
|
|
2162 | eval { |
|
|
2163 | require Net::SSLeay; |
|
|
2164 | require AnyEvent::TLS; |
|
|
2165 | 1 |
|
|
2166 | } or return $self->_error (Errno::EPROTO, 1, "TLS support not available on this system"); |
|
|
2167 | } |
|
|
2168 | |
1966 | $self->{tls} = $tls; |
2169 | $self->{tls} = $tls; |
1967 | $self->{tls_ctx} = $ctx if @_ > 2; |
2170 | $self->{tls_ctx} = $ctx if @_ > 2; |
1968 | |
2171 | |
1969 | return unless $self->{fh}; |
2172 | return unless $self->{fh}; |
1970 | |
2173 | |
1971 | require Net::SSLeay; |
|
|
1972 | |
|
|
1973 | $ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL (); |
2174 | $ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL (); |
1974 | $ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ (); |
2175 | $ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ (); |
1975 | |
2176 | |
1976 | $tls = delete $self->{tls}; |
2177 | $tls = delete $self->{tls}; |
1977 | $ctx = $self->{tls_ctx}; |
2178 | $ctx = $self->{tls_ctx}; |
1978 | |
2179 | |
1979 | local $Carp::CarpLevel = 1; # skip ourselves when creating a new context or session |
2180 | local $Carp::CarpLevel = 1; # skip ourselves when creating a new context or session |
1980 | |
2181 | |
1981 | if ("HASH" eq ref $ctx) { |
2182 | if ("HASH" eq ref $ctx) { |
1982 | require AnyEvent::TLS; |
|
|
1983 | |
|
|
1984 | if ($ctx->{cache}) { |
2183 | if ($ctx->{cache}) { |
1985 | my $key = $ctx+0; |
2184 | my $key = $ctx+0; |
1986 | $ctx = $TLS_CACHE{$key} ||= new AnyEvent::TLS %$ctx; |
2185 | $ctx = $TLS_CACHE{$key} ||= new AnyEvent::TLS %$ctx; |
1987 | } else { |
2186 | } else { |
1988 | $ctx = new AnyEvent::TLS %$ctx; |
2187 | $ctx = new AnyEvent::TLS %$ctx; |
… | |
… | |
2010 | Net::SSLeay::CTX_set_mode ($tls, 1|2); |
2209 | Net::SSLeay::CTX_set_mode ($tls, 1|2); |
2011 | |
2210 | |
2012 | $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
2211 | $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
2013 | $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
2212 | $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
2014 | |
2213 | |
2015 | Net::SSLeay::BIO_write ($self->{_rbio}, delete $self->{rbuf}); |
2214 | Net::SSLeay::BIO_write ($self->{_rbio}, $self->{rbuf}); |
|
|
2215 | $self->{rbuf} = ""; |
2016 | |
2216 | |
2017 | Net::SSLeay::set_bio ($tls, $self->{_rbio}, $self->{_wbio}); |
2217 | Net::SSLeay::set_bio ($tls, $self->{_rbio}, $self->{_wbio}); |
2018 | |
2218 | |
2019 | $self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) } |
2219 | $self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) } |
2020 | if $self->{on_starttls}; |
2220 | if $self->{on_starttls}; |
… | |
… | |
2202 | Probably because your C<on_error> callback is being called instead: When |
2402 | Probably because your C<on_error> callback is being called instead: When |
2203 | you have outstanding requests in your read queue, then an EOF is |
2403 | you have outstanding requests in your read queue, then an EOF is |
2204 | considered an error as you clearly expected some data. |
2404 | considered an error as you clearly expected some data. |
2205 | |
2405 | |
2206 | To avoid this, make sure you have an empty read queue whenever your handle |
2406 | To avoid this, make sure you have an empty read queue whenever your handle |
2207 | is supposed to be "idle" (i.e. connection closes are O.K.). You cna set |
2407 | is supposed to be "idle" (i.e. connection closes are O.K.). You can set |
2208 | an C<on_read> handler that simply pushes the first read requests in the |
2408 | an C<on_read> handler that simply pushes the first read requests in the |
2209 | queue. |
2409 | queue. |
2210 | |
2410 | |
2211 | See also the next question, which explains this in a bit more detail. |
2411 | See also the next question, which explains this in a bit more detail. |
2212 | |
2412 | |
… | |
… | |
2220 | handles requests until the server gets some QUIT command, causing it to |
2420 | handles requests until the server gets some QUIT command, causing it to |
2221 | close the connection first (highly desirable for a busy TCP server). A |
2421 | close the connection first (highly desirable for a busy TCP server). A |
2222 | client dropping the connection is an error, which means this variant can |
2422 | client dropping the connection is an error, which means this variant can |
2223 | detect an unexpected detection close. |
2423 | detect an unexpected detection close. |
2224 | |
2424 | |
2225 | To handle this case, always make sure you have a on-empty read queue, by |
2425 | To handle this case, always make sure you have a non-empty read queue, by |
2226 | pushing the "read request start" handler on it: |
2426 | pushing the "read request start" handler on it: |
2227 | |
2427 | |
2228 | # we assume a request starts with a single line |
2428 | # we assume a request starts with a single line |
2229 | my @start_request; @start_request = (line => sub { |
2429 | my @start_request; @start_request = (line => sub { |
2230 | my ($hdl, $line) = @_; |
2430 | my ($hdl, $line) = @_; |
… | |
… | |
2243 | some data and raises the C<EPIPE> error when the connction is dropped |
2443 | some data and raises the C<EPIPE> error when the connction is dropped |
2244 | unexpectedly. |
2444 | unexpectedly. |
2245 | |
2445 | |
2246 | The second variant is a protocol where the client can drop the connection |
2446 | The second variant is a protocol where the client can drop the connection |
2247 | at any time. For TCP, this means that the server machine may run out of |
2447 | at any time. For TCP, this means that the server machine may run out of |
2248 | sockets easier, and in general, it means you cnanot distinguish a protocl |
2448 | sockets easier, and in general, it means you cannot distinguish a protocl |
2249 | failure/client crash from a normal connection close. Nevertheless, these |
2449 | failure/client crash from a normal connection close. Nevertheless, these |
2250 | kinds of protocols are common (and sometimes even the best solution to the |
2450 | kinds of protocols are common (and sometimes even the best solution to the |
2251 | problem). |
2451 | problem). |
2252 | |
2452 | |
2253 | Having an outstanding read request at all times is possible if you ignore |
2453 | Having an outstanding read request at all times is possible if you ignore |
… | |
… | |
2305 | $handle->on_eof (undef); |
2505 | $handle->on_eof (undef); |
2306 | $handle->on_error (sub { |
2506 | $handle->on_error (sub { |
2307 | my $data = delete $_[0]{rbuf}; |
2507 | my $data = delete $_[0]{rbuf}; |
2308 | }); |
2508 | }); |
2309 | |
2509 | |
|
|
2510 | Note that this example removes the C<rbuf> member from the handle object, |
|
|
2511 | which is not normally allowed by the API. It is expressly permitted in |
|
|
2512 | this case only, as the handle object needs to be destroyed afterwards. |
|
|
2513 | |
2310 | The reason to use C<on_error> is that TCP connections, due to latencies |
2514 | The reason to use C<on_error> is that TCP connections, due to latencies |
2311 | and packets loss, might get closed quite violently with an error, when in |
2515 | and packets loss, might get closed quite violently with an error, when in |
2312 | fact all data has been received. |
2516 | fact all data has been received. |
2313 | |
2517 | |
2314 | It is usually better to use acknowledgements when transferring data, |
2518 | It is usually better to use acknowledgements when transferring data, |
… | |
… | |
2324 | C<low_water_mark> this will be called precisely when all data has been |
2528 | C<low_water_mark> this will be called precisely when all data has been |
2325 | written to the socket: |
2529 | written to the socket: |
2326 | |
2530 | |
2327 | $handle->push_write (...); |
2531 | $handle->push_write (...); |
2328 | $handle->on_drain (sub { |
2532 | $handle->on_drain (sub { |
2329 | warn "all data submitted to the kernel\n"; |
2533 | AE::log debug => "All data submitted to the kernel."; |
2330 | undef $handle; |
2534 | undef $handle; |
2331 | }); |
2535 | }); |
2332 | |
2536 | |
2333 | If you just want to queue some data and then signal EOF to the other side, |
2537 | If you just want to queue some data and then signal EOF to the other side, |
2334 | consider using C<< ->push_shutdown >> instead. |
2538 | consider using C<< ->push_shutdown >> instead. |
… | |
… | |
2418 | When you have intermediate CA certificates that your clients might not |
2622 | When you have intermediate CA certificates that your clients might not |
2419 | know about, just append them to the C<cert_file>. |
2623 | know about, just append them to the C<cert_file>. |
2420 | |
2624 | |
2421 | =back |
2625 | =back |
2422 | |
2626 | |
2423 | |
|
|
2424 | =head1 SUBCLASSING AnyEvent::Handle |
2627 | =head1 SUBCLASSING AnyEvent::Handle |
2425 | |
2628 | |
2426 | In many cases, you might want to subclass AnyEvent::Handle. |
2629 | In many cases, you might want to subclass AnyEvent::Handle. |
2427 | |
2630 | |
2428 | To make this easier, a given version of AnyEvent::Handle uses these |
2631 | To make this easier, a given version of AnyEvent::Handle uses these |
… | |
… | |
2454 | |
2657 | |
2455 | Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>. |
2658 | Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>. |
2456 | |
2659 | |
2457 | =cut |
2660 | =cut |
2458 | |
2661 | |
2459 | 1; # End of AnyEvent::Handle |
2662 | 1 |
|
|
2663 | |