… | |
… | |
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 = 4.231; |
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"); |
… | |
… | |
49 | |
49 | |
50 | This module is a helper module to make it easier to do event-based I/O on |
50 | This module is a helper module to make it easier to do event-based I/O on |
51 | filehandles. For utility functions for doing non-blocking connects and accepts |
51 | filehandles. For utility functions for doing non-blocking connects and accepts |
52 | on sockets see L<AnyEvent::Util>. |
52 | on sockets see L<AnyEvent::Util>. |
53 | |
53 | |
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54 | The L<AnyEvent::Intro> tutorial contains some well-documented |
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55 | AnyEvent::Handle examples. |
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56 | |
54 | In the following, when the documentation refers to of "bytes" then this |
57 | In the following, when the documentation refers to of "bytes" then this |
55 | means characters. As sysread and syswrite are used for all I/O, their |
58 | means characters. As sysread and syswrite are used for all I/O, their |
56 | treatment of characters applies to this module as well. |
59 | treatment of characters applies to this module as well. |
57 | |
60 | |
58 | 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 |
… | |
… | |
70 | |
73 | |
71 | =item fh => $filehandle [MANDATORY] |
74 | =item fh => $filehandle [MANDATORY] |
72 | |
75 | |
73 | The filehandle this L<AnyEvent::Handle> object will operate on. |
76 | The filehandle this L<AnyEvent::Handle> object will operate on. |
74 | |
77 | |
75 | NOTE: The filehandle will be set to non-blocking (using |
78 | NOTE: The filehandle will be set to non-blocking mode (using |
76 | AnyEvent::Util::fh_nonblocking). |
79 | C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in |
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80 | that mode. |
77 | |
81 | |
78 | =item on_eof => $cb->($handle) |
82 | =item on_eof => $cb->($handle) |
79 | |
83 | |
80 | 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, |
81 | 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 |
82 | connection cleanly. |
86 | connection cleanly. |
83 | |
87 | |
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88 | For sockets, this just means that the other side has stopped sending data, |
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89 | you can still try to write data, and, in fact, one can return from the EOF |
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90 | callback and continue writing data, as only the read part has been shut |
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91 | down. |
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92 | |
84 | 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, |
85 | 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 |
86 | waiting for data. |
95 | waiting for data. |
87 | |
96 | |
88 | 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 |
89 | 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>. |
… | |
… | |
93 | This is the error callback, which is called when, well, some error |
102 | This is the error callback, which is called when, well, some error |
94 | occured, such as not being able to resolve the hostname, failure to |
103 | occured, such as not being able to resolve the hostname, failure to |
95 | connect or a read error. |
104 | connect or a read error. |
96 | |
105 | |
97 | Some errors are fatal (which is indicated by C<$fatal> being true). On |
106 | Some errors are fatal (which is indicated by C<$fatal> being true). On |
98 | fatal errors the handle object will be shut down and will not be |
107 | fatal errors the handle object will be shut down and will not be usable |
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108 | (but you are free to look at the current C<< ->rbuf >>). Examples of fatal |
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109 | errors are an EOF condition with active (but unsatisifable) read watchers |
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110 | (C<EPIPE>) or I/O errors. |
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111 | |
99 | usable. Non-fatal errors can be retried by simply returning, but it is |
112 | Non-fatal errors can be retried by simply returning, but it is recommended |
100 | recommended to simply ignore this parameter and instead abondon the handle |
113 | to simply ignore this parameter and instead abondon the handle object |
101 | object when this callback is invoked. |
114 | when this callback is invoked. Examples of non-fatal errors are timeouts |
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115 | C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>). |
102 | |
116 | |
103 | On callback entrance, the value of C<$!> contains the operating system |
117 | On callback entrance, the value of C<$!> contains the operating system |
104 | error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>). |
118 | error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>). |
105 | |
119 | |
106 | While not mandatory, it is I<highly> recommended to set this callback, as |
120 | While not mandatory, it is I<highly> recommended to set this callback, as |
… | |
… | |
138 | =item timeout => $fractional_seconds |
152 | =item timeout => $fractional_seconds |
139 | |
153 | |
140 | If non-zero, then this enables an "inactivity" timeout: whenever this many |
154 | If non-zero, then this enables an "inactivity" timeout: whenever this many |
141 | seconds pass without a successful read or write on the underlying file |
155 | seconds pass without a successful read or write on the underlying file |
142 | handle, the C<on_timeout> callback will be invoked (and if that one is |
156 | handle, the C<on_timeout> callback will be invoked (and if that one is |
143 | missing, an C<ETIMEDOUT> error will be raised). |
157 | missing, a non-fatal C<ETIMEDOUT> error will be raised). |
144 | |
158 | |
145 | Note that timeout processing is also active when you currently do not have |
159 | Note that timeout processing is also active when you currently do not have |
146 | any outstanding read or write requests: If you plan to keep the connection |
160 | any outstanding read or write requests: If you plan to keep the connection |
147 | idle then you should disable the timout temporarily or ignore the timeout |
161 | idle then you should disable the timout temporarily or ignore the timeout |
148 | in the C<on_timeout> callback. |
162 | in the C<on_timeout> callback, in which case AnyEvent::Handle will simply |
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163 | restart the timeout. |
149 | |
164 | |
150 | Zero (the default) disables this timeout. |
165 | Zero (the default) disables this timeout. |
151 | |
166 | |
152 | =item on_timeout => $cb->($handle) |
167 | =item on_timeout => $cb->($handle) |
153 | |
168 | |
… | |
… | |
157 | |
172 | |
158 | =item rbuf_max => <bytes> |
173 | =item rbuf_max => <bytes> |
159 | |
174 | |
160 | If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
175 | If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
161 | when the read buffer ever (strictly) exceeds this size. This is useful to |
176 | when the read buffer ever (strictly) exceeds this size. This is useful to |
162 | avoid denial-of-service attacks. |
177 | avoid some forms of denial-of-service attacks. |
163 | |
178 | |
164 | For example, a server accepting connections from untrusted sources should |
179 | For example, a server accepting connections from untrusted sources should |
165 | be configured to accept only so-and-so much data that it cannot act on |
180 | be configured to accept only so-and-so much data that it cannot act on |
166 | (for example, when expecting a line, an attacker could send an unlimited |
181 | (for example, when expecting a line, an attacker could send an unlimited |
167 | amount of data without a callback ever being called as long as the line |
182 | amount of data without a callback ever being called as long as the line |
168 | isn't finished). |
183 | isn't finished). |
169 | |
184 | |
170 | =item autocork => <boolean> |
185 | =item autocork => <boolean> |
171 | |
186 | |
172 | When disabled (the default), then C<push_write> will try to immediately |
187 | When disabled (the default), then C<push_write> will try to immediately |
173 | write the data to the handle if possible. This avoids having to register |
188 | write the data to the handle, if possible. This avoids having to register |
174 | a write watcher and wait for the next event loop iteration, but can be |
189 | a write watcher and wait for the next event loop iteration, but can |
175 | inefficient if you write multiple small chunks (this disadvantage is |
190 | be inefficient if you write multiple small chunks (on the wire, this |
176 | usually avoided by your kernel's nagle algorithm, see C<low_delay>). |
191 | disadvantage is usually avoided by your kernel's nagle algorithm, see |
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192 | C<no_delay>, but this option can save costly syscalls). |
177 | |
193 | |
178 | When enabled, then writes will always be queued till the next event loop |
194 | When enabled, then writes will always be queued till the next event loop |
179 | iteration. This is efficient when you do many small writes per iteration, |
195 | iteration. This is efficient when you do many small writes per iteration, |
180 | but less efficient when you do a single write only. |
196 | but less efficient when you do a single write only per iteration (or when |
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197 | the write buffer often is full). It also increases write latency. |
181 | |
198 | |
182 | =item no_delay => <boolean> |
199 | =item no_delay => <boolean> |
183 | |
200 | |
184 | When doing small writes on sockets, your operating system kernel might |
201 | When doing small writes on sockets, your operating system kernel might |
185 | wait a bit for more data before actually sending it out. This is called |
202 | wait a bit for more data before actually sending it out. This is called |
186 | the Nagle algorithm, and usually it is beneficial. |
203 | the Nagle algorithm, and usually it is beneficial. |
187 | |
204 | |
188 | In some situations you want as low a delay as possible, which cna be |
205 | In some situations you want as low a delay as possible, which can be |
189 | accomplishd by setting this option to true. |
206 | accomplishd by setting this option to a true value. |
190 | |
207 | |
191 | The default is your opertaing system's default behaviour, this option |
208 | The default is your opertaing system's default behaviour (most likely |
192 | explicitly enables or disables it, if possible. |
209 | enabled), this option explicitly enables or disables it, if possible. |
193 | |
210 | |
194 | =item read_size => <bytes> |
211 | =item read_size => <bytes> |
195 | |
212 | |
196 | The default read block size (the amount of bytes this module will try to read |
213 | The default read block size (the amount of bytes this module will |
197 | during each (loop iteration). Default: C<8192>. |
214 | try to read during each loop iteration, which affects memory |
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215 | requirements). Default: C<8192>. |
198 | |
216 | |
199 | =item low_water_mark => <bytes> |
217 | =item low_water_mark => <bytes> |
200 | |
218 | |
201 | Sets the amount of bytes (default: C<0>) that make up an "empty" write |
219 | Sets the amount of bytes (default: C<0>) that make up an "empty" write |
202 | buffer: If the write reaches this size or gets even samller it is |
220 | buffer: If the write reaches this size or gets even samller it is |
203 | considered empty. |
221 | considered empty. |
204 | |
222 | |
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223 | Sometimes it can be beneficial (for performance reasons) to add data to |
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224 | the write buffer before it is fully drained, but this is a rare case, as |
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225 | the operating system kernel usually buffers data as well, so the default |
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226 | is good in almost all cases. |
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227 | |
205 | =item linger => <seconds> |
228 | =item linger => <seconds> |
206 | |
229 | |
207 | If non-zero (default: C<3600>), then the destructor of the |
230 | If non-zero (default: C<3600>), then the destructor of the |
208 | AnyEvent::Handle object will check wether there is still outstanding write |
231 | AnyEvent::Handle object will check whether there is still outstanding |
209 | data and will install a watcher that will write out this data. No errors |
232 | write data and will install a watcher that will write this data to the |
210 | will be reported (this mostly matches how the operating system treats |
233 | socket. No errors will be reported (this mostly matches how the operating |
211 | outstanding data at socket close time). |
234 | system treats outstanding data at socket close time). |
212 | |
235 | |
213 | This will not work for partial TLS data that could not yet been |
236 | This will not work for partial TLS data that could not be encoded |
214 | encoded. This data will be lost. |
237 | yet. This data will be lost. Calling the C<stoptls> method in time might |
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238 | help. |
215 | |
239 | |
216 | =item tls => "accept" | "connect" | Net::SSLeay::SSL object |
240 | =item tls => "accept" | "connect" | Net::SSLeay::SSL object |
217 | |
241 | |
218 | When this parameter is given, it enables TLS (SSL) mode, that means it |
242 | When this parameter is given, it enables TLS (SSL) mode, that means |
219 | will start making tls handshake and will transparently encrypt/decrypt |
243 | AnyEvent will start a TLS handshake as soon as the conenction has been |
220 | data. |
244 | established and will transparently encrypt/decrypt data afterwards. |
221 | |
245 | |
222 | TLS mode requires Net::SSLeay to be installed (it will be loaded |
246 | TLS mode requires Net::SSLeay to be installed (it will be loaded |
223 | automatically when you try to create a TLS handle). |
247 | automatically when you try to create a TLS handle): this module doesn't |
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248 | have a dependency on that module, so if your module requires it, you have |
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249 | to add the dependency yourself. |
224 | |
250 | |
225 | For the TLS server side, use C<accept>, and for the TLS client side of a |
251 | Unlike TCP, TLS has a server and client side: for the TLS server side, use |
226 | connection, use C<connect> mode. |
252 | C<accept>, and for the TLS client side of a connection, use C<connect> |
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253 | mode. |
227 | |
254 | |
228 | You can also provide your own TLS connection object, but you have |
255 | You can also provide your own TLS connection object, but you have |
229 | to make sure that you call either C<Net::SSLeay::set_connect_state> |
256 | to make sure that you call either C<Net::SSLeay::set_connect_state> |
230 | or C<Net::SSLeay::set_accept_state> on it before you pass it to |
257 | or C<Net::SSLeay::set_accept_state> on it before you pass it to |
231 | AnyEvent::Handle. |
258 | AnyEvent::Handle. |
232 | |
259 | |
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260 | B<IMPORTANT:> since Net::SSLeay "objects" are really only integers, |
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261 | passing in the wrong integer will lead to certain crash. This most often |
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262 | happens when one uses a stylish C<< tls => 1 >> and is surprised about the |
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263 | segmentation fault. |
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264 | |
233 | See the C<starttls> method if you need to start TLS negotiation later. |
265 | See the C<< ->starttls >> method for when need to start TLS negotiation later. |
234 | |
266 | |
235 | =item tls_ctx => $ssl_ctx |
267 | =item tls_ctx => $ssl_ctx |
236 | |
268 | |
237 | Use the given Net::SSLeay::CTX object to create the new TLS connection |
269 | Use the given C<Net::SSLeay::CTX> object to create the new TLS connection |
238 | (unless a connection object was specified directly). If this parameter is |
270 | (unless a connection object was specified directly). If this parameter is |
239 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
271 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
240 | |
272 | |
241 | =item json => JSON or JSON::XS object |
273 | =item json => JSON or JSON::XS object |
242 | |
274 | |
243 | This is the json coder object used by the C<json> read and write types. |
275 | This is the json coder object used by the C<json> read and write types. |
244 | |
276 | |
245 | If you don't supply it, then AnyEvent::Handle will create and use a |
277 | If you don't supply it, then AnyEvent::Handle will create and use a |
246 | suitable one, which will write and expect UTF-8 encoded JSON texts. |
278 | suitable one (on demand), which will write and expect UTF-8 encoded JSON |
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279 | texts. |
247 | |
280 | |
248 | Note that you are responsible to depend on the JSON module if you want to |
281 | Note that you are responsible to depend on the JSON module if you want to |
249 | use this functionality, as AnyEvent does not have a dependency itself. |
282 | use this functionality, as AnyEvent does not have a dependency itself. |
250 | |
283 | |
251 | =item filter_r => $cb |
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252 | |
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253 | =item filter_w => $cb |
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254 | |
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255 | These exist, but are undocumented at this time. |
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256 | |
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257 | =back |
284 | =back |
258 | |
285 | |
259 | =cut |
286 | =cut |
260 | |
287 | |
261 | sub new { |
288 | sub new { |
… | |
… | |
265 | |
292 | |
266 | $self->{fh} or Carp::croak "mandatory argument fh is missing"; |
293 | $self->{fh} or Carp::croak "mandatory argument fh is missing"; |
267 | |
294 | |
268 | AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
295 | AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
269 | |
296 | |
270 | if ($self->{tls}) { |
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271 | require Net::SSLeay; |
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272 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}); |
297 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}) |
273 | } |
298 | if $self->{tls}; |
274 | |
299 | |
275 | $self->{_activity} = AnyEvent->now; |
300 | $self->{_activity} = AnyEvent->now; |
276 | $self->_timeout; |
301 | $self->_timeout; |
277 | |
302 | |
278 | $self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain}; |
303 | $self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain}; |
… | |
… | |
290 | delete $self->{_tw}; |
315 | delete $self->{_tw}; |
291 | delete $self->{_rw}; |
316 | delete $self->{_rw}; |
292 | delete $self->{_ww}; |
317 | delete $self->{_ww}; |
293 | delete $self->{fh}; |
318 | delete $self->{fh}; |
294 | |
319 | |
295 | $self->stoptls; |
320 | &_freetls; |
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321 | |
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322 | delete $self->{on_read}; |
|
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323 | delete $self->{_queue}; |
296 | } |
324 | } |
297 | |
325 | |
298 | sub _error { |
326 | sub _error { |
299 | my ($self, $errno, $fatal) = @_; |
327 | my ($self, $errno, $fatal) = @_; |
300 | |
328 | |
… | |
… | |
303 | |
331 | |
304 | $! = $errno; |
332 | $! = $errno; |
305 | |
333 | |
306 | if ($self->{on_error}) { |
334 | if ($self->{on_error}) { |
307 | $self->{on_error}($self, $fatal); |
335 | $self->{on_error}($self, $fatal); |
308 | } else { |
336 | } elsif ($self->{fh}) { |
309 | Carp::croak "AnyEvent::Handle uncaught error: $!"; |
337 | Carp::croak "AnyEvent::Handle uncaught error: $!"; |
310 | } |
338 | } |
311 | } |
339 | } |
312 | |
340 | |
313 | =item $fh = $handle->fh |
341 | =item $fh = $handle->fh |
314 | |
342 | |
315 | This method returns the file handle of the L<AnyEvent::Handle> object. |
343 | This method returns the file handle used to create the L<AnyEvent::Handle> object. |
316 | |
344 | |
317 | =cut |
345 | =cut |
318 | |
346 | |
319 | sub fh { $_[0]{fh} } |
347 | sub fh { $_[0]{fh} } |
320 | |
348 | |
… | |
… | |
338 | $_[0]{on_eof} = $_[1]; |
366 | $_[0]{on_eof} = $_[1]; |
339 | } |
367 | } |
340 | |
368 | |
341 | =item $handle->on_timeout ($cb) |
369 | =item $handle->on_timeout ($cb) |
342 | |
370 | |
343 | Replace the current C<on_timeout> callback, or disables the callback |
371 | Replace the current C<on_timeout> callback, or disables the callback (but |
344 | (but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor |
372 | not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor |
345 | argument. |
373 | argument and method. |
346 | |
374 | |
347 | =cut |
375 | =cut |
348 | |
376 | |
349 | sub on_timeout { |
377 | sub on_timeout { |
350 | $_[0]{on_timeout} = $_[1]; |
378 | $_[0]{on_timeout} = $_[1]; |
351 | } |
379 | } |
352 | |
380 | |
353 | =item $handle->autocork ($boolean) |
381 | =item $handle->autocork ($boolean) |
354 | |
382 | |
355 | Enables or disables the current autocork behaviour (see C<autocork> |
383 | Enables or disables the current autocork behaviour (see C<autocork> |
356 | constructor argument). |
384 | constructor argument). Changes will only take effect on the next write. |
357 | |
385 | |
358 | =cut |
386 | =cut |
|
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387 | |
|
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388 | sub autocork { |
|
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389 | $_[0]{autocork} = $_[1]; |
|
|
390 | } |
359 | |
391 | |
360 | =item $handle->no_delay ($boolean) |
392 | =item $handle->no_delay ($boolean) |
361 | |
393 | |
362 | Enables or disables the C<no_delay> setting (see constructor argument of |
394 | Enables or disables the C<no_delay> setting (see constructor argument of |
363 | the same name for details). |
395 | the same name for details). |
… | |
… | |
456 | my ($self, $cb) = @_; |
488 | my ($self, $cb) = @_; |
457 | |
489 | |
458 | $self->{on_drain} = $cb; |
490 | $self->{on_drain} = $cb; |
459 | |
491 | |
460 | $cb->($self) |
492 | $cb->($self) |
461 | if $cb && $self->{low_water_mark} >= length $self->{wbuf}; |
493 | if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf}); |
462 | } |
494 | } |
463 | |
495 | |
464 | =item $handle->push_write ($data) |
496 | =item $handle->push_write ($data) |
465 | |
497 | |
466 | Queues the given scalar to be written. You can push as much data as you |
498 | Queues the given scalar to be written. You can push as much data as you |
… | |
… | |
483 | substr $self->{wbuf}, 0, $len, ""; |
515 | substr $self->{wbuf}, 0, $len, ""; |
484 | |
516 | |
485 | $self->{_activity} = AnyEvent->now; |
517 | $self->{_activity} = AnyEvent->now; |
486 | |
518 | |
487 | $self->{on_drain}($self) |
519 | $self->{on_drain}($self) |
488 | if $self->{low_water_mark} >= length $self->{wbuf} |
520 | if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf}) |
489 | && $self->{on_drain}; |
521 | && $self->{on_drain}; |
490 | |
522 | |
491 | delete $self->{_ww} unless length $self->{wbuf}; |
523 | delete $self->{_ww} unless length $self->{wbuf}; |
492 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
524 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
493 | $self->_error ($!, 1); |
525 | $self->_error ($!, 1); |
… | |
… | |
517 | |
549 | |
518 | @_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write") |
550 | @_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write") |
519 | ->($self, @_); |
551 | ->($self, @_); |
520 | } |
552 | } |
521 | |
553 | |
522 | if ($self->{filter_w}) { |
554 | if ($self->{tls}) { |
523 | $self->{filter_w}($self, \$_[0]); |
555 | $self->{_tls_wbuf} .= $_[0]; |
|
|
556 | |
|
|
557 | &_dotls ($self); |
524 | } else { |
558 | } else { |
525 | $self->{wbuf} .= $_[0]; |
559 | $self->{wbuf} .= $_[0]; |
526 | $self->_drain_wbuf; |
560 | $self->_drain_wbuf; |
527 | } |
561 | } |
528 | } |
562 | } |
… | |
… | |
545 | =cut |
579 | =cut |
546 | |
580 | |
547 | register_write_type netstring => sub { |
581 | register_write_type netstring => sub { |
548 | my ($self, $string) = @_; |
582 | my ($self, $string) = @_; |
549 | |
583 | |
550 | sprintf "%d:%s,", (length $string), $string |
584 | (length $string) . ":$string," |
551 | }; |
585 | }; |
552 | |
586 | |
553 | =item packstring => $format, $data |
587 | =item packstring => $format, $data |
554 | |
588 | |
555 | An octet string prefixed with an encoded length. The encoding C<$format> |
589 | An octet string prefixed with an encoded length. The encoding C<$format> |
… | |
… | |
729 | |
763 | |
730 | if ( |
764 | if ( |
731 | defined $self->{rbuf_max} |
765 | defined $self->{rbuf_max} |
732 | && $self->{rbuf_max} < length $self->{rbuf} |
766 | && $self->{rbuf_max} < length $self->{rbuf} |
733 | ) { |
767 | ) { |
734 | return $self->_error (&Errno::ENOSPC, 1); |
768 | $self->_error (&Errno::ENOSPC, 1), return; |
735 | } |
769 | } |
736 | |
770 | |
737 | while () { |
771 | while () { |
738 | my $len = length $self->{rbuf}; |
772 | my $len = length $self->{rbuf}; |
739 | |
773 | |
740 | if (my $cb = shift @{ $self->{_queue} }) { |
774 | if (my $cb = shift @{ $self->{_queue} }) { |
741 | unless ($cb->($self)) { |
775 | unless ($cb->($self)) { |
742 | if ($self->{_eof}) { |
776 | if ($self->{_eof}) { |
743 | # no progress can be made (not enough data and no data forthcoming) |
777 | # no progress can be made (not enough data and no data forthcoming) |
744 | $self->_error (&Errno::EPIPE, 1), last; |
778 | $self->_error (&Errno::EPIPE, 1), return; |
745 | } |
779 | } |
746 | |
780 | |
747 | unshift @{ $self->{_queue} }, $cb; |
781 | unshift @{ $self->{_queue} }, $cb; |
748 | last; |
782 | last; |
749 | } |
783 | } |
… | |
… | |
757 | && !@{ $self->{_queue} } # and the queue is still empty |
791 | && !@{ $self->{_queue} } # and the queue is still empty |
758 | && $self->{on_read} # but we still have on_read |
792 | && $self->{on_read} # but we still have on_read |
759 | ) { |
793 | ) { |
760 | # no further data will arrive |
794 | # no further data will arrive |
761 | # so no progress can be made |
795 | # so no progress can be made |
762 | $self->_error (&Errno::EPIPE, 1), last |
796 | $self->_error (&Errno::EPIPE, 1), return |
763 | if $self->{_eof}; |
797 | if $self->{_eof}; |
764 | |
798 | |
765 | last; # more data might arrive |
799 | last; # more data might arrive |
766 | } |
800 | } |
767 | } else { |
801 | } else { |
768 | # read side becomes idle |
802 | # read side becomes idle |
769 | delete $self->{_rw}; |
803 | delete $self->{_rw} unless $self->{tls}; |
770 | last; |
804 | last; |
771 | } |
805 | } |
772 | } |
806 | } |
773 | |
807 | |
774 | if ($self->{_eof}) { |
808 | if ($self->{_eof}) { |
… | |
… | |
1069 | An octet string prefixed with an encoded length. The encoding C<$format> |
1103 | An octet string prefixed with an encoded length. The encoding C<$format> |
1070 | uses the same format as a Perl C<pack> format, but must specify a single |
1104 | uses the same format as a Perl C<pack> format, but must specify a single |
1071 | integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an |
1105 | integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an |
1072 | optional C<!>, C<< < >> or C<< > >> modifier). |
1106 | optional C<!>, C<< < >> or C<< > >> modifier). |
1073 | |
1107 | |
1074 | DNS over TCP uses a prefix of C<n>, EPP uses a prefix of C<N>. |
1108 | For example, DNS over TCP uses a prefix of C<n> (2 octet network order), |
|
|
1109 | EPP uses a prefix of C<N> (4 octtes). |
1075 | |
1110 | |
1076 | Example: read a block of data prefixed by its length in BER-encoded |
1111 | Example: read a block of data prefixed by its length in BER-encoded |
1077 | format (very efficient). |
1112 | format (very efficient). |
1078 | |
1113 | |
1079 | $handle->push_read (packstring => "w", sub { |
1114 | $handle->push_read (packstring => "w", sub { |
… | |
… | |
1109 | } |
1144 | } |
1110 | }; |
1145 | }; |
1111 | |
1146 | |
1112 | =item json => $cb->($handle, $hash_or_arrayref) |
1147 | =item json => $cb->($handle, $hash_or_arrayref) |
1113 | |
1148 | |
1114 | Reads a JSON object or array, decodes it and passes it to the callback. |
1149 | Reads a JSON object or array, decodes it and passes it to the |
|
|
1150 | callback. When a parse error occurs, an C<EBADMSG> error will be raised. |
1115 | |
1151 | |
1116 | If a C<json> object was passed to the constructor, then that will be used |
1152 | If a C<json> object was passed to the constructor, then that will be used |
1117 | for the final decode, otherwise it will create a JSON coder expecting UTF-8. |
1153 | for the final decode, otherwise it will create a JSON coder expecting UTF-8. |
1118 | |
1154 | |
1119 | This read type uses the incremental parser available with JSON version |
1155 | This read type uses the incremental parser available with JSON version |
… | |
… | |
1136 | my $rbuf = \$self->{rbuf}; |
1172 | my $rbuf = \$self->{rbuf}; |
1137 | |
1173 | |
1138 | my $json = $self->{json} ||= JSON->new->utf8; |
1174 | my $json = $self->{json} ||= JSON->new->utf8; |
1139 | |
1175 | |
1140 | sub { |
1176 | sub { |
1141 | my $ref = $json->incr_parse ($self->{rbuf}); |
1177 | my $ref = eval { $json->incr_parse ($self->{rbuf}) }; |
1142 | |
1178 | |
1143 | if ($ref) { |
1179 | if ($ref) { |
1144 | $self->{rbuf} = $json->incr_text; |
1180 | $self->{rbuf} = $json->incr_text; |
1145 | $json->incr_text = ""; |
1181 | $json->incr_text = ""; |
1146 | $cb->($self, $ref); |
1182 | $cb->($self, $ref); |
1147 | |
1183 | |
1148 | 1 |
1184 | 1 |
|
|
1185 | } elsif ($@) { |
|
|
1186 | # error case |
|
|
1187 | $json->incr_skip; |
|
|
1188 | |
|
|
1189 | $self->{rbuf} = $json->incr_text; |
|
|
1190 | $json->incr_text = ""; |
|
|
1191 | |
|
|
1192 | $self->_error (&Errno::EBADMSG); |
|
|
1193 | |
|
|
1194 | () |
1149 | } else { |
1195 | } else { |
1150 | $self->{rbuf} = ""; |
1196 | $self->{rbuf} = ""; |
|
|
1197 | |
1151 | () |
1198 | () |
1152 | } |
1199 | } |
1153 | } |
1200 | } |
1154 | }; |
1201 | }; |
1155 | |
1202 | |
… | |
… | |
1232 | Note that AnyEvent::Handle will automatically C<start_read> for you when |
1279 | Note that AnyEvent::Handle will automatically C<start_read> for you when |
1233 | you change the C<on_read> callback or push/unshift a read callback, and it |
1280 | you change the C<on_read> callback or push/unshift a read callback, and it |
1234 | will automatically C<stop_read> for you when neither C<on_read> is set nor |
1281 | will automatically C<stop_read> for you when neither C<on_read> is set nor |
1235 | there are any read requests in the queue. |
1282 | there are any read requests in the queue. |
1236 | |
1283 | |
|
|
1284 | These methods will have no effect when in TLS mode (as TLS doesn't support |
|
|
1285 | half-duplex connections). |
|
|
1286 | |
1237 | =cut |
1287 | =cut |
1238 | |
1288 | |
1239 | sub stop_read { |
1289 | sub stop_read { |
1240 | my ($self) = @_; |
1290 | my ($self) = @_; |
1241 | |
1291 | |
1242 | delete $self->{_rw}; |
1292 | delete $self->{_rw} unless $self->{tls}; |
1243 | } |
1293 | } |
1244 | |
1294 | |
1245 | sub start_read { |
1295 | sub start_read { |
1246 | my ($self) = @_; |
1296 | my ($self) = @_; |
1247 | |
1297 | |
1248 | unless ($self->{_rw} || $self->{_eof}) { |
1298 | unless ($self->{_rw} || $self->{_eof}) { |
1249 | Scalar::Util::weaken $self; |
1299 | Scalar::Util::weaken $self; |
1250 | |
1300 | |
1251 | $self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
1301 | $self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
1252 | my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf}; |
1302 | my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf}); |
1253 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
1303 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
1254 | |
1304 | |
1255 | if ($len > 0) { |
1305 | if ($len > 0) { |
1256 | $self->{_activity} = AnyEvent->now; |
1306 | $self->{_activity} = AnyEvent->now; |
1257 | |
1307 | |
1258 | $self->{filter_r} |
1308 | if ($self->{tls}) { |
1259 | ? $self->{filter_r}($self, $rbuf) |
1309 | Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf); |
1260 | : $self->{_in_drain} || $self->_drain_rbuf; |
1310 | |
|
|
1311 | &_dotls ($self); |
|
|
1312 | } else { |
|
|
1313 | $self->_drain_rbuf unless $self->{_in_drain}; |
|
|
1314 | } |
1261 | |
1315 | |
1262 | } elsif (defined $len) { |
1316 | } elsif (defined $len) { |
1263 | delete $self->{_rw}; |
1317 | delete $self->{_rw}; |
1264 | $self->{_eof} = 1; |
1318 | $self->{_eof} = 1; |
1265 | $self->_drain_rbuf unless $self->{_in_drain}; |
1319 | $self->_drain_rbuf unless $self->{_in_drain}; |
… | |
… | |
1269 | } |
1323 | } |
1270 | }); |
1324 | }); |
1271 | } |
1325 | } |
1272 | } |
1326 | } |
1273 | |
1327 | |
|
|
1328 | # poll the write BIO and send the data if applicable |
1274 | sub _dotls { |
1329 | sub _dotls { |
1275 | my ($self) = @_; |
1330 | my ($self) = @_; |
1276 | |
1331 | |
1277 | my $buf; |
1332 | my $tmp; |
1278 | |
1333 | |
1279 | if (length $self->{_tls_wbuf}) { |
1334 | if (length $self->{_tls_wbuf}) { |
1280 | while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) { |
1335 | while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) { |
1281 | substr $self->{_tls_wbuf}, 0, $len, ""; |
1336 | substr $self->{_tls_wbuf}, 0, $tmp, ""; |
1282 | } |
1337 | } |
1283 | } |
1338 | } |
1284 | |
1339 | |
1285 | if (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
|
|
1286 | $self->{wbuf} .= $buf; |
|
|
1287 | $self->_drain_wbuf; |
|
|
1288 | } |
|
|
1289 | |
|
|
1290 | while (defined ($buf = Net::SSLeay::read ($self->{tls}))) { |
1340 | while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) { |
1291 | if (length $buf) { |
1341 | unless (length $tmp) { |
1292 | $self->{rbuf} .= $buf; |
|
|
1293 | $self->_drain_rbuf unless $self->{_in_drain}; |
|
|
1294 | } else { |
|
|
1295 | # let's treat SSL-eof as we treat normal EOF |
1342 | # let's treat SSL-eof as we treat normal EOF |
|
|
1343 | delete $self->{_rw}; |
1296 | $self->{_eof} = 1; |
1344 | $self->{_eof} = 1; |
1297 | $self->_shutdown; |
1345 | &_freetls; |
1298 | return; |
|
|
1299 | } |
1346 | } |
1300 | } |
|
|
1301 | |
1347 | |
|
|
1348 | $self->{rbuf} .= $tmp; |
|
|
1349 | $self->_drain_rbuf unless $self->{_in_drain}; |
|
|
1350 | $self->{tls} or return; # tls session might have gone away in callback |
|
|
1351 | } |
|
|
1352 | |
1302 | my $err = Net::SSLeay::get_error ($self->{tls}, -1); |
1353 | $tmp = Net::SSLeay::get_error ($self->{tls}, -1); |
1303 | |
1354 | |
1304 | if ($err!= Net::SSLeay::ERROR_WANT_READ ()) { |
1355 | if ($tmp != Net::SSLeay::ERROR_WANT_READ ()) { |
1305 | if ($err == Net::SSLeay::ERROR_SYSCALL ()) { |
1356 | if ($tmp == Net::SSLeay::ERROR_SYSCALL ()) { |
1306 | return $self->_error ($!, 1); |
1357 | return $self->_error ($!, 1); |
1307 | } elsif ($err == Net::SSLeay::ERROR_SSL ()) { |
1358 | } elsif ($tmp == Net::SSLeay::ERROR_SSL ()) { |
1308 | return $self->_error (&Errno::EIO, 1); |
1359 | return $self->_error (&Errno::EIO, 1); |
1309 | } |
1360 | } |
1310 | |
1361 | |
1311 | # all others are fine for our purposes |
1362 | # all other errors are fine for our purposes |
|
|
1363 | } |
|
|
1364 | |
|
|
1365 | while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
|
|
1366 | $self->{wbuf} .= $tmp; |
|
|
1367 | $self->_drain_wbuf; |
1312 | } |
1368 | } |
1313 | } |
1369 | } |
1314 | |
1370 | |
1315 | =item $handle->starttls ($tls[, $tls_ctx]) |
1371 | =item $handle->starttls ($tls[, $tls_ctx]) |
1316 | |
1372 | |
… | |
… | |
1326 | |
1382 | |
1327 | The TLS connection object will end up in C<< $handle->{tls} >> after this |
1383 | The TLS connection object will end up in C<< $handle->{tls} >> after this |
1328 | call and can be used or changed to your liking. Note that the handshake |
1384 | call and can be used or changed to your liking. Note that the handshake |
1329 | might have already started when this function returns. |
1385 | might have already started when this function returns. |
1330 | |
1386 | |
|
|
1387 | If it an error to start a TLS handshake more than once per |
|
|
1388 | AnyEvent::Handle object (this is due to bugs in OpenSSL). |
|
|
1389 | |
1331 | =cut |
1390 | =cut |
1332 | |
1391 | |
1333 | sub starttls { |
1392 | sub starttls { |
1334 | my ($self, $ssl, $ctx) = @_; |
1393 | my ($self, $ssl, $ctx) = @_; |
1335 | |
1394 | |
1336 | $self->stoptls; |
1395 | require Net::SSLeay; |
1337 | |
1396 | |
|
|
1397 | Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object" |
|
|
1398 | if $self->{tls}; |
|
|
1399 | |
1338 | if ($ssl eq "accept") { |
1400 | if ($ssl eq "accept") { |
1339 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
1401 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
1340 | Net::SSLeay::set_accept_state ($ssl); |
1402 | Net::SSLeay::set_accept_state ($ssl); |
1341 | } elsif ($ssl eq "connect") { |
1403 | } elsif ($ssl eq "connect") { |
1342 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
1404 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
… | |
… | |
1348 | # basically, this is deep magic (because SSL_read should have the same issues) |
1410 | # basically, this is deep magic (because SSL_read should have the same issues) |
1349 | # but the openssl maintainers basically said: "trust us, it just works". |
1411 | # but the openssl maintainers basically said: "trust us, it just works". |
1350 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
1412 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
1351 | # and mismaintained ssleay-module doesn't even offer them). |
1413 | # and mismaintained ssleay-module doesn't even offer them). |
1352 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
1414 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
|
|
1415 | # |
|
|
1416 | # in short: this is a mess. |
|
|
1417 | # |
|
|
1418 | # note that we do not try to keep the length constant between writes as we are required to do. |
|
|
1419 | # we assume that most (but not all) of this insanity only applies to non-blocking cases, |
|
|
1420 | # and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to |
|
|
1421 | # have identity issues in that area. |
1353 | Net::SSLeay::CTX_set_mode ($self->{tls}, |
1422 | Net::SSLeay::CTX_set_mode ($self->{tls}, |
1354 | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
1423 | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
1355 | | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
1424 | | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
1356 | |
1425 | |
1357 | $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1426 | $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1358 | $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1427 | $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1359 | |
1428 | |
1360 | Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio}); |
1429 | Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio}); |
1361 | |
1430 | |
1362 | $self->{filter_w} = sub { |
1431 | &_dotls; # need to trigger the initial handshake |
1363 | $_[0]{_tls_wbuf} .= ${$_[1]}; |
1432 | $self->start_read; # make sure we actually do read |
1364 | &_dotls; |
|
|
1365 | }; |
|
|
1366 | $self->{filter_r} = sub { |
|
|
1367 | Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]}); |
|
|
1368 | &_dotls; |
|
|
1369 | }; |
|
|
1370 | } |
1433 | } |
1371 | |
1434 | |
1372 | =item $handle->stoptls |
1435 | =item $handle->stoptls |
1373 | |
1436 | |
1374 | Destroys the SSL connection, if any. Partial read or write data will be |
1437 | Shuts down the SSL connection - this makes a proper EOF handshake by |
1375 | lost. |
1438 | sending a close notify to the other side, but since OpenSSL doesn't |
|
|
1439 | support non-blocking shut downs, it is not possible to re-use the stream |
|
|
1440 | afterwards. |
1376 | |
1441 | |
1377 | =cut |
1442 | =cut |
1378 | |
1443 | |
1379 | sub stoptls { |
1444 | sub stoptls { |
1380 | my ($self) = @_; |
1445 | my ($self) = @_; |
1381 | |
1446 | |
|
|
1447 | if ($self->{tls}) { |
|
|
1448 | Net::SSLeay::shutdown ($self->{tls}); |
|
|
1449 | |
|
|
1450 | &_dotls; |
|
|
1451 | |
|
|
1452 | # we don't give a shit. no, we do, but we can't. no... |
|
|
1453 | # we, we... have to use openssl :/ |
|
|
1454 | &_freetls; |
|
|
1455 | } |
|
|
1456 | } |
|
|
1457 | |
|
|
1458 | sub _freetls { |
|
|
1459 | my ($self) = @_; |
|
|
1460 | |
|
|
1461 | return unless $self->{tls}; |
|
|
1462 | |
1382 | Net::SSLeay::free (delete $self->{tls}) if $self->{tls}; |
1463 | Net::SSLeay::free (delete $self->{tls}); |
1383 | |
1464 | |
1384 | delete $self->{_rbio}; |
1465 | delete @$self{qw(_rbio _wbio _tls_wbuf)}; |
1385 | delete $self->{_wbio}; |
|
|
1386 | delete $self->{_tls_wbuf}; |
|
|
1387 | delete $self->{filter_r}; |
|
|
1388 | delete $self->{filter_w}; |
|
|
1389 | } |
1466 | } |
1390 | |
1467 | |
1391 | sub DESTROY { |
1468 | sub DESTROY { |
1392 | my $self = shift; |
1469 | my $self = shift; |
1393 | |
1470 | |
1394 | $self->stoptls; |
1471 | &_freetls; |
1395 | |
1472 | |
1396 | my $linger = exists $self->{linger} ? $self->{linger} : 3600; |
1473 | my $linger = exists $self->{linger} ? $self->{linger} : 3600; |
1397 | |
1474 | |
1398 | if ($linger && length $self->{wbuf}) { |
1475 | if ($linger && length $self->{wbuf}) { |
1399 | my $fh = delete $self->{fh}; |
1476 | my $fh = delete $self->{fh}; |
… | |
… | |
1414 | @linger = (); |
1491 | @linger = (); |
1415 | }); |
1492 | }); |
1416 | } |
1493 | } |
1417 | } |
1494 | } |
1418 | |
1495 | |
|
|
1496 | =item $handle->destroy |
|
|
1497 | |
|
|
1498 | Shuts down the handle object as much as possible - this call ensures that |
|
|
1499 | no further callbacks will be invoked and resources will be freed as much |
|
|
1500 | as possible. You must not call any methods on the object afterwards. |
|
|
1501 | |
|
|
1502 | Normally, you can just "forget" any references to an AnyEvent::Handle |
|
|
1503 | object and it will simply shut down. This works in fatal error and EOF |
|
|
1504 | callbacks, as well as code outside. It does I<NOT> work in a read or write |
|
|
1505 | callback, so when you want to destroy the AnyEvent::Handle object from |
|
|
1506 | within such an callback. You I<MUST> call C<< ->destroy >> explicitly in |
|
|
1507 | that case. |
|
|
1508 | |
|
|
1509 | The handle might still linger in the background and write out remaining |
|
|
1510 | data, as specified by the C<linger> option, however. |
|
|
1511 | |
|
|
1512 | =cut |
|
|
1513 | |
|
|
1514 | sub destroy { |
|
|
1515 | my ($self) = @_; |
|
|
1516 | |
|
|
1517 | $self->DESTROY; |
|
|
1518 | %$self = (); |
|
|
1519 | } |
|
|
1520 | |
1419 | =item AnyEvent::Handle::TLS_CTX |
1521 | =item AnyEvent::Handle::TLS_CTX |
1420 | |
1522 | |
1421 | This function creates and returns the Net::SSLeay::CTX object used by |
1523 | This function creates and returns the Net::SSLeay::CTX object used by |
1422 | default for TLS mode. |
1524 | default for TLS mode. |
1423 | |
1525 | |
… | |
… | |
1451 | } |
1553 | } |
1452 | } |
1554 | } |
1453 | |
1555 | |
1454 | =back |
1556 | =back |
1455 | |
1557 | |
|
|
1558 | |
|
|
1559 | =head1 NONFREQUENTLY ASKED QUESTIONS |
|
|
1560 | |
|
|
1561 | =over 4 |
|
|
1562 | |
|
|
1563 | =item I C<undef> the AnyEvent::Handle reference inside my callback and |
|
|
1564 | still get further invocations! |
|
|
1565 | |
|
|
1566 | That's because AnyEvent::Handle keeps a reference to itself when handling |
|
|
1567 | read or write callbacks. |
|
|
1568 | |
|
|
1569 | It is only safe to "forget" the reference inside EOF or error callbacks, |
|
|
1570 | from within all other callbacks, you need to explicitly call the C<< |
|
|
1571 | ->destroy >> method. |
|
|
1572 | |
|
|
1573 | =item I get different callback invocations in TLS mode/Why can't I pause |
|
|
1574 | reading? |
|
|
1575 | |
|
|
1576 | Unlike, say, TCP, TLS connections do not consist of two independent |
|
|
1577 | communication channels, one for each direction. Or put differently. The |
|
|
1578 | read and write directions are not independent of each other: you cannot |
|
|
1579 | write data unless you are also prepared to read, and vice versa. |
|
|
1580 | |
|
|
1581 | This can mean than, in TLS mode, you might get C<on_error> or C<on_eof> |
|
|
1582 | callback invocations when you are not expecting any read data - the reason |
|
|
1583 | is that AnyEvent::Handle always reads in TLS mode. |
|
|
1584 | |
|
|
1585 | During the connection, you have to make sure that you always have a |
|
|
1586 | non-empty read-queue, or an C<on_read> watcher. At the end of the |
|
|
1587 | connection (or when you no longer want to use it) you can call the |
|
|
1588 | C<destroy> method. |
|
|
1589 | |
|
|
1590 | =item How do I read data until the other side closes the connection? |
|
|
1591 | |
|
|
1592 | If you just want to read your data into a perl scalar, the easiest way |
|
|
1593 | to achieve this is by setting an C<on_read> callback that does nothing, |
|
|
1594 | clearing the C<on_eof> callback and in the C<on_error> callback, the data |
|
|
1595 | will be in C<$_[0]{rbuf}>: |
|
|
1596 | |
|
|
1597 | $handle->on_read (sub { }); |
|
|
1598 | $handle->on_eof (undef); |
|
|
1599 | $handle->on_error (sub { |
|
|
1600 | my $data = delete $_[0]{rbuf}; |
|
|
1601 | undef $handle; |
|
|
1602 | }); |
|
|
1603 | |
|
|
1604 | The reason to use C<on_error> is that TCP connections, due to latencies |
|
|
1605 | and packets loss, might get closed quite violently with an error, when in |
|
|
1606 | fact, all data has been received. |
|
|
1607 | |
|
|
1608 | It is usually better to use acknowledgements when transferring data, |
|
|
1609 | to make sure the other side hasn't just died and you got the data |
|
|
1610 | intact. This is also one reason why so many internet protocols have an |
|
|
1611 | explicit QUIT command. |
|
|
1612 | |
|
|
1613 | =item I don't want to destroy the handle too early - how do I wait until |
|
|
1614 | all data has been written? |
|
|
1615 | |
|
|
1616 | After writing your last bits of data, set the C<on_drain> callback |
|
|
1617 | and destroy the handle in there - with the default setting of |
|
|
1618 | C<low_water_mark> this will be called precisely when all data has been |
|
|
1619 | written to the socket: |
|
|
1620 | |
|
|
1621 | $handle->push_write (...); |
|
|
1622 | $handle->on_drain (sub { |
|
|
1623 | warn "all data submitted to the kernel\n"; |
|
|
1624 | undef $handle; |
|
|
1625 | }); |
|
|
1626 | |
|
|
1627 | =back |
|
|
1628 | |
|
|
1629 | |
1456 | =head1 SUBCLASSING AnyEvent::Handle |
1630 | =head1 SUBCLASSING AnyEvent::Handle |
1457 | |
1631 | |
1458 | In many cases, you might want to subclass AnyEvent::Handle. |
1632 | In many cases, you might want to subclass AnyEvent::Handle. |
1459 | |
1633 | |
1460 | To make this easier, a given version of AnyEvent::Handle uses these |
1634 | To make this easier, a given version of AnyEvent::Handle uses these |