| … | |
… | |
| 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 warn => "got error $msg\n"; |
| 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 | AE::log warn => "got line <$line>\n"; |
| 28 | $cv->send; |
28 | $cv->send; |
| 29 | }); |
29 | }); |
| 30 | |
30 | |
| 31 | $cv->recv; |
31 | $cv->recv; |
| 32 | |
32 | |
| … | |
… | |
| 1081 | =cut |
1081 | =cut |
| 1082 | |
1082 | |
| 1083 | register_write_type storable => sub { |
1083 | register_write_type storable => sub { |
| 1084 | my ($self, $ref) = @_; |
1084 | my ($self, $ref) = @_; |
| 1085 | |
1085 | |
| 1086 | require Storable; |
1086 | require Storable unless $Storable::VERSION; |
| 1087 | |
1087 | |
| 1088 | pack "w/a*", Storable::nfreeze ($ref) |
1088 | pack "w/a*", Storable::nfreeze ($ref) |
| 1089 | }; |
1089 | }; |
| 1090 | |
1090 | |
| 1091 | =back |
1091 | =back |
| … | |
… | |
| 1128 | |
1128 | |
| 1129 | Whenever the given C<type> is used, C<push_write> will the function with |
1129 | Whenever the given C<type> is used, C<push_write> will the function with |
| 1130 | the handle object and the remaining arguments. |
1130 | the handle object and the remaining arguments. |
| 1131 | |
1131 | |
| 1132 | The function is supposed to return a single octet string that will be |
1132 | The function is supposed to return a single octet string that will be |
| 1133 | appended to the write buffer, so you cna mentally treat this function as a |
1133 | appended to the write buffer, so you can mentally treat this function as a |
| 1134 | "arguments to on-the-wire-format" converter. |
1134 | "arguments to on-the-wire-format" converter. |
| 1135 | |
1135 | |
| 1136 | Example: implement a custom write type C<join> that joins the remaining |
1136 | Example: implement a custom write type C<join> that joins the remaining |
| 1137 | arguments using the first one. |
1137 | arguments using the first one. |
| 1138 | |
1138 | |
| … | |
… | |
| 1432 | data. |
1432 | data. |
| 1433 | |
1433 | |
| 1434 | Example: read 2 bytes. |
1434 | Example: read 2 bytes. |
| 1435 | |
1435 | |
| 1436 | $handle->push_read (chunk => 2, sub { |
1436 | $handle->push_read (chunk => 2, sub { |
| 1437 | warn "yay ", unpack "H*", $_[1]; |
1437 | AE::log debug => "yay " . unpack "H*", $_[1]; |
| 1438 | }); |
1438 | }); |
| 1439 | |
1439 | |
| 1440 | =cut |
1440 | =cut |
| 1441 | |
1441 | |
| 1442 | register_read_type chunk => sub { |
1442 | register_read_type chunk => sub { |
| … | |
… | |
| 1711 | =cut |
1711 | =cut |
| 1712 | |
1712 | |
| 1713 | register_read_type storable => sub { |
1713 | register_read_type storable => sub { |
| 1714 | my ($self, $cb) = @_; |
1714 | my ($self, $cb) = @_; |
| 1715 | |
1715 | |
| 1716 | require Storable; |
1716 | require Storable unless $Storable::VERSION; |
| 1717 | |
1717 | |
| 1718 | sub { |
1718 | sub { |
| 1719 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
1719 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
| 1720 | defined (my $len = eval { unpack "w", $_[0]{rbuf} }) |
1720 | defined (my $len = eval { unpack "w", $_[0]{rbuf} }) |
| 1721 | or return; |
1721 | or return; |
| … | |
… | |
| 2204 | Probably because your C<on_error> callback is being called instead: When |
2204 | Probably because your C<on_error> callback is being called instead: When |
| 2205 | you have outstanding requests in your read queue, then an EOF is |
2205 | you have outstanding requests in your read queue, then an EOF is |
| 2206 | considered an error as you clearly expected some data. |
2206 | considered an error as you clearly expected some data. |
| 2207 | |
2207 | |
| 2208 | To avoid this, make sure you have an empty read queue whenever your handle |
2208 | To avoid this, make sure you have an empty read queue whenever your handle |
| 2209 | is supposed to be "idle" (i.e. connection closes are O.K.). You cna set |
2209 | is supposed to be "idle" (i.e. connection closes are O.K.). You can set |
| 2210 | an C<on_read> handler that simply pushes the first read requests in the |
2210 | an C<on_read> handler that simply pushes the first read requests in the |
| 2211 | queue. |
2211 | queue. |
| 2212 | |
2212 | |
| 2213 | See also the next question, which explains this in a bit more detail. |
2213 | See also the next question, which explains this in a bit more detail. |
| 2214 | |
2214 | |
| … | |
… | |
| 2245 | some data and raises the C<EPIPE> error when the connction is dropped |
2245 | some data and raises the C<EPIPE> error when the connction is dropped |
| 2246 | unexpectedly. |
2246 | unexpectedly. |
| 2247 | |
2247 | |
| 2248 | The second variant is a protocol where the client can drop the connection |
2248 | The second variant is a protocol where the client can drop the connection |
| 2249 | at any time. For TCP, this means that the server machine may run out of |
2249 | at any time. For TCP, this means that the server machine may run out of |
| 2250 | sockets easier, and in general, it means you cnanot distinguish a protocl |
2250 | sockets easier, and in general, it means you cannot distinguish a protocl |
| 2251 | failure/client crash from a normal connection close. Nevertheless, these |
2251 | failure/client crash from a normal connection close. Nevertheless, these |
| 2252 | kinds of protocols are common (and sometimes even the best solution to the |
2252 | kinds of protocols are common (and sometimes even the best solution to the |
| 2253 | problem). |
2253 | problem). |
| 2254 | |
2254 | |
| 2255 | Having an outstanding read request at all times is possible if you ignore |
2255 | Having an outstanding read request at all times is possible if you ignore |
| … | |
… | |
| 2330 | C<low_water_mark> this will be called precisely when all data has been |
2330 | C<low_water_mark> this will be called precisely when all data has been |
| 2331 | written to the socket: |
2331 | written to the socket: |
| 2332 | |
2332 | |
| 2333 | $handle->push_write (...); |
2333 | $handle->push_write (...); |
| 2334 | $handle->on_drain (sub { |
2334 | $handle->on_drain (sub { |
| 2335 | warn "all data submitted to the kernel\n"; |
2335 | AE::log debug => "all data submitted to the kernel\n"; |
| 2336 | undef $handle; |
2336 | undef $handle; |
| 2337 | }); |
2337 | }); |
| 2338 | |
2338 | |
| 2339 | If you just want to queue some data and then signal EOF to the other side, |
2339 | If you just want to queue some data and then signal EOF to the other side, |
| 2340 | consider using C<< ->push_shutdown >> instead. |
2340 | consider using C<< ->push_shutdown >> instead. |
