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2 | |
2 | |
3 | no warnings; |
3 | no warnings; |
4 | use strict; |
4 | use strict; |
5 | |
5 | |
6 | use AnyEvent (); |
6 | use AnyEvent (); |
7 | use AnyEvent::Util qw(WSAWOULDBLOCK); |
7 | use AnyEvent::Util qw(WSAEWOULDBLOCK); |
8 | use Scalar::Util (); |
8 | use Scalar::Util (); |
9 | use Carp (); |
9 | use Carp (); |
10 | use Fcntl (); |
10 | use Fcntl (); |
11 | use Errno qw/EAGAIN EINTR/; |
11 | use Errno qw(EAGAIN EINTR); |
12 | |
12 | |
13 | =head1 NAME |
13 | =head1 NAME |
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 | |
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73 | The filehandle this L<AnyEvent::Handle> object will operate on. |
73 | The filehandle this L<AnyEvent::Handle> object will operate on. |
74 | |
74 | |
75 | NOTE: The filehandle will be set to non-blocking (using |
75 | NOTE: The filehandle will be set to non-blocking (using |
76 | AnyEvent::Util::fh_nonblocking). |
76 | AnyEvent::Util::fh_nonblocking). |
77 | |
77 | |
78 | =item on_eof => $cb->($self) |
78 | =item on_eof => $cb->($handle) |
79 | |
79 | |
80 | Set the callback to be called on EOF. |
80 | Set the callback to be called on EOF. |
81 | |
81 | |
82 | While not mandatory, it is highly recommended to set an eof callback, |
82 | While not mandatory, it is highly recommended to set an eof callback, |
83 | otherwise you might end up with a closed socket while you are still |
83 | otherwise you might end up with a closed socket while you are still |
84 | waiting for data. |
84 | waiting for data. |
85 | |
85 | |
86 | =item on_error => $cb->($self) |
86 | =item on_error => $cb->($handle) |
87 | |
87 | |
88 | This is the fatal error callback, that is called when, well, a fatal error |
88 | This is the fatal error callback, that is called when, well, a fatal error |
89 | occurs, such as not being able to resolve the hostname, failure to connect |
89 | occurs, such as not being able to resolve the hostname, failure to connect |
90 | or a read error. |
90 | or a read error. |
91 | |
91 | |
92 | The object will not be in a usable state when this callback has been |
92 | The object will not be in a usable state when this callback has been |
93 | called. |
93 | called. |
94 | |
94 | |
95 | On callback entrance, the value of C<$!> contains the operating system |
95 | On callback entrance, the value of C<$!> contains the operating system |
96 | error (or C<ENOSPC>, C<EPIPE> or C<EBADMSG>). |
96 | error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>). |
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97 | |
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98 | The callback should throw an exception. If it returns, then |
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99 | AnyEvent::Handle will C<croak> for you. |
97 | |
100 | |
98 | While not mandatory, it is I<highly> recommended to set this callback, as |
101 | While not mandatory, it is I<highly> recommended to set this callback, as |
99 | you will not be notified of errors otherwise. The default simply calls |
102 | you will not be notified of errors otherwise. The default simply calls |
100 | die. |
103 | die. |
101 | |
104 | |
102 | =item on_read => $cb->($self) |
105 | =item on_read => $cb->($handle) |
103 | |
106 | |
104 | This sets the default read callback, which is called when data arrives |
107 | This sets the default read callback, which is called when data arrives |
105 | and no read request is in the queue. |
108 | and no read request is in the queue. |
106 | |
109 | |
107 | To access (and remove data from) the read buffer, use the C<< ->rbuf >> |
110 | To access (and remove data from) the read buffer, use the C<< ->rbuf >> |
108 | method or access the C<$self->{rbuf}> member directly. |
111 | method or access the C<$handle->{rbuf}> member directly. |
109 | |
112 | |
110 | When an EOF condition is detected then AnyEvent::Handle will first try to |
113 | When an EOF condition is detected then AnyEvent::Handle will first try to |
111 | feed all the remaining data to the queued callbacks and C<on_read> before |
114 | feed all the remaining data to the queued callbacks and C<on_read> before |
112 | calling the C<on_eof> callback. If no progress can be made, then a fatal |
115 | calling the C<on_eof> callback. If no progress can be made, then a fatal |
113 | error will be raised (with C<$!> set to C<EPIPE>). |
116 | error will be raised (with C<$!> set to C<EPIPE>). |
114 | |
117 | |
115 | =item on_drain => $cb->() |
118 | =item on_drain => $cb->($handle) |
116 | |
119 | |
117 | This sets the callback that is called when the write buffer becomes empty |
120 | This sets the callback that is called when the write buffer becomes empty |
118 | (or when the callback is set and the buffer is empty already). |
121 | (or when the callback is set and the buffer is empty already). |
119 | |
122 | |
120 | To append to the write buffer, use the C<< ->push_write >> method. |
123 | To append to the write buffer, use the C<< ->push_write >> method. |
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124 | |
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125 | =item timeout => $fractional_seconds |
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126 | |
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127 | If non-zero, then this enables an "inactivity" timeout: whenever this many |
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128 | seconds pass without a successful read or write on the underlying file |
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129 | handle, the C<on_timeout> callback will be invoked (and if that one is |
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130 | missing, an C<ETIMEDOUT> error will be raised). |
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131 | |
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132 | Note that timeout processing is also active when you currently do not have |
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133 | any outstanding read or write requests: If you plan to keep the connection |
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134 | idle then you should disable the timout temporarily or ignore the timeout |
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135 | in the C<on_timeout> callback. |
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136 | |
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137 | Zero (the default) disables this timeout. |
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138 | |
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139 | =item on_timeout => $cb->($handle) |
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140 | |
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141 | Called whenever the inactivity timeout passes. If you return from this |
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142 | callback, then the timeout will be reset as if some activity had happened, |
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143 | so this condition is not fatal in any way. |
121 | |
144 | |
122 | =item rbuf_max => <bytes> |
145 | =item rbuf_max => <bytes> |
123 | |
146 | |
124 | If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
147 | If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
125 | when the read buffer ever (strictly) exceeds this size. This is useful to |
148 | when the read buffer ever (strictly) exceeds this size. This is useful to |
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132 | isn't finished). |
155 | isn't finished). |
133 | |
156 | |
134 | =item read_size => <bytes> |
157 | =item read_size => <bytes> |
135 | |
158 | |
136 | The default read block size (the amount of bytes this module will try to read |
159 | The default read block size (the amount of bytes this module will try to read |
137 | on each [loop iteration). Default: C<4096>. |
160 | during each (loop iteration). Default: C<8192>. |
138 | |
161 | |
139 | =item low_water_mark => <bytes> |
162 | =item low_water_mark => <bytes> |
140 | |
163 | |
141 | Sets the amount of bytes (default: C<0>) that make up an "empty" write |
164 | Sets the amount of bytes (default: C<0>) that make up an "empty" write |
142 | buffer: If the write reaches this size or gets even samller it is |
165 | buffer: If the write reaches this size or gets even samller it is |
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165 | |
188 | |
166 | Use the given Net::SSLeay::CTX object to create the new TLS connection |
189 | Use the given Net::SSLeay::CTX object to create the new TLS connection |
167 | (unless a connection object was specified directly). If this parameter is |
190 | (unless a connection object was specified directly). If this parameter is |
168 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
191 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
169 | |
192 | |
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193 | =item json => JSON or JSON::XS object |
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194 | |
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195 | This is the json coder object used by the C<json> read and write types. |
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196 | |
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197 | If you don't supply it, then AnyEvent::Handle will create and use a |
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198 | suitable one, which will write and expect UTF-8 encoded JSON texts. |
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199 | |
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200 | Note that you are responsible to depend on the JSON module if you want to |
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201 | use this functionality, as AnyEvent does not have a dependency itself. |
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202 | |
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203 | =item filter_r => $cb |
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204 | |
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205 | =item filter_w => $cb |
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206 | |
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207 | These exist, but are undocumented at this time. |
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208 | |
170 | =back |
209 | =back |
171 | |
210 | |
172 | =cut |
211 | =cut |
173 | |
212 | |
174 | sub new { |
213 | sub new { |
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183 | if ($self->{tls}) { |
222 | if ($self->{tls}) { |
184 | require Net::SSLeay; |
223 | require Net::SSLeay; |
185 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}); |
224 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}); |
186 | } |
225 | } |
187 | |
226 | |
188 | $self->on_eof (delete $self->{on_eof} ) if $self->{on_eof}; |
227 | # $self->on_eof (delete $self->{on_eof} ) if $self->{on_eof}; # nop |
189 | $self->on_error (delete $self->{on_error}) if $self->{on_error}; |
228 | # $self->on_error (delete $self->{on_error}) if $self->{on_error}; # nop |
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229 | # $self->on_read (delete $self->{on_read} ) if $self->{on_read}; # nop |
190 | $self->on_drain (delete $self->{on_drain}) if $self->{on_drain}; |
230 | $self->on_drain (delete $self->{on_drain}) if $self->{on_drain}; |
191 | $self->on_read (delete $self->{on_read} ) if $self->{on_read}; |
231 | |
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232 | $self->{_activity} = AnyEvent->now; |
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233 | $self->_timeout; |
192 | |
234 | |
193 | $self->start_read; |
235 | $self->start_read; |
194 | |
236 | |
195 | $self |
237 | $self |
196 | } |
238 | } |
197 | |
239 | |
198 | sub _shutdown { |
240 | sub _shutdown { |
199 | my ($self) = @_; |
241 | my ($self) = @_; |
200 | |
242 | |
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243 | delete $self->{_tw}; |
201 | delete $self->{rw}; |
244 | delete $self->{_rw}; |
202 | delete $self->{ww}; |
245 | delete $self->{_ww}; |
203 | delete $self->{fh}; |
246 | delete $self->{fh}; |
204 | } |
247 | } |
205 | |
248 | |
206 | sub error { |
249 | sub error { |
207 | my ($self) = @_; |
250 | my ($self) = @_; |
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209 | { |
252 | { |
210 | local $!; |
253 | local $!; |
211 | $self->_shutdown; |
254 | $self->_shutdown; |
212 | } |
255 | } |
213 | |
256 | |
214 | if ($self->{on_error}) { |
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215 | $self->{on_error}($self); |
257 | $self->{on_error}($self) |
216 | } else { |
258 | if $self->{on_error}; |
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259 | |
217 | Carp::croak "AnyEvent::Handle uncaught fatal error: $!"; |
260 | Carp::croak "AnyEvent::Handle uncaught fatal error: $!"; |
218 | } |
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219 | } |
261 | } |
220 | |
262 | |
221 | =item $fh = $handle->fh |
263 | =item $fh = $handle->fh |
222 | |
264 | |
223 | This method returns the file handle of the L<AnyEvent::Handle> object. |
265 | This method returns the file handle of the L<AnyEvent::Handle> object. |
224 | |
266 | |
225 | =cut |
267 | =cut |
226 | |
268 | |
227 | sub fh { $_[0]->{fh} } |
269 | sub fh { $_[0]{fh} } |
228 | |
270 | |
229 | =item $handle->on_error ($cb) |
271 | =item $handle->on_error ($cb) |
230 | |
272 | |
231 | Replace the current C<on_error> callback (see the C<on_error> constructor argument). |
273 | Replace the current C<on_error> callback (see the C<on_error> constructor argument). |
232 | |
274 | |
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242 | |
284 | |
243 | =cut |
285 | =cut |
244 | |
286 | |
245 | sub on_eof { |
287 | sub on_eof { |
246 | $_[0]{on_eof} = $_[1]; |
288 | $_[0]{on_eof} = $_[1]; |
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289 | } |
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290 | |
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291 | =item $handle->on_timeout ($cb) |
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292 | |
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293 | Replace the current C<on_timeout> callback, or disables the callback |
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294 | (but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor |
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295 | argument. |
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296 | |
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297 | =cut |
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298 | |
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299 | sub on_timeout { |
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300 | $_[0]{on_timeout} = $_[1]; |
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301 | } |
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302 | |
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303 | ############################################################################# |
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304 | |
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305 | =item $handle->timeout ($seconds) |
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306 | |
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307 | Configures (or disables) the inactivity timeout. |
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308 | |
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309 | =cut |
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310 | |
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311 | sub timeout { |
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312 | my ($self, $timeout) = @_; |
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313 | |
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314 | $self->{timeout} = $timeout; |
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315 | $self->_timeout; |
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316 | } |
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317 | |
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318 | # reset the timeout watcher, as neccessary |
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319 | # also check for time-outs |
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320 | sub _timeout { |
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321 | my ($self) = @_; |
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322 | |
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323 | if ($self->{timeout}) { |
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324 | my $NOW = AnyEvent->now; |
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325 | |
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326 | # when would the timeout trigger? |
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327 | my $after = $self->{_activity} + $self->{timeout} - $NOW; |
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328 | |
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329 | # now or in the past already? |
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330 | if ($after <= 0) { |
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331 | $self->{_activity} = $NOW; |
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332 | |
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333 | if ($self->{on_timeout}) { |
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334 | $self->{on_timeout}->($self); |
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335 | } else { |
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336 | $! = Errno::ETIMEDOUT; |
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337 | $self->error; |
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338 | } |
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339 | |
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340 | # callbakx could have changed timeout value, optimise |
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341 | return unless $self->{timeout}; |
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342 | |
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343 | # calculate new after |
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344 | $after = $self->{timeout}; |
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345 | } |
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346 | |
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347 | Scalar::Util::weaken $self; |
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348 | |
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349 | $self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub { |
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350 | delete $self->{_tw}; |
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351 | $self->_timeout; |
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352 | }); |
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353 | } else { |
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354 | delete $self->{_tw}; |
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355 | } |
247 | } |
356 | } |
248 | |
357 | |
249 | ############################################################################# |
358 | ############################################################################# |
250 | |
359 | |
251 | =back |
360 | =back |
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288 | =cut |
397 | =cut |
289 | |
398 | |
290 | sub _drain_wbuf { |
399 | sub _drain_wbuf { |
291 | my ($self) = @_; |
400 | my ($self) = @_; |
292 | |
401 | |
293 | if (!$self->{ww} && length $self->{wbuf}) { |
402 | if (!$self->{_ww} && length $self->{wbuf}) { |
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403 | |
294 | Scalar::Util::weaken $self; |
404 | Scalar::Util::weaken $self; |
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405 | |
295 | my $cb = sub { |
406 | my $cb = sub { |
296 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
407 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
297 | |
408 | |
298 | if ($len >= 0) { |
409 | if ($len >= 0) { |
299 | substr $self->{wbuf}, 0, $len, ""; |
410 | substr $self->{wbuf}, 0, $len, ""; |
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411 | |
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412 | $self->{_activity} = AnyEvent->now; |
300 | |
413 | |
301 | $self->{on_drain}($self) |
414 | $self->{on_drain}($self) |
302 | if $self->{low_water_mark} >= length $self->{wbuf} |
415 | if $self->{low_water_mark} >= length $self->{wbuf} |
303 | && $self->{on_drain}; |
416 | && $self->{on_drain}; |
304 | |
417 | |
305 | delete $self->{ww} unless length $self->{wbuf}; |
418 | delete $self->{_ww} unless length $self->{wbuf}; |
306 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAWOULDBLOCK) { |
419 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
307 | $self->error; |
420 | $self->error; |
308 | } |
421 | } |
309 | }; |
422 | }; |
310 | |
423 | |
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424 | # try to write data immediately |
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425 | $cb->(); |
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426 | |
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427 | # if still data left in wbuf, we need to poll |
311 | $self->{ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb); |
428 | $self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb) |
312 | |
429 | if length $self->{wbuf}; |
313 | $cb->($self); |
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314 | }; |
430 | }; |
315 | } |
431 | } |
316 | |
432 | |
317 | our %WH; |
433 | our %WH; |
318 | |
434 | |
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363 | my ($self, $string) = @_; |
479 | my ($self, $string) = @_; |
364 | |
480 | |
365 | sprintf "%d:%s,", (length $string), $string |
481 | sprintf "%d:%s,", (length $string), $string |
366 | }; |
482 | }; |
367 | |
483 | |
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484 | =item json => $array_or_hashref |
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485 | |
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486 | Encodes the given hash or array reference into a JSON object. Unless you |
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487 | provide your own JSON object, this means it will be encoded to JSON text |
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488 | in UTF-8. |
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489 | |
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490 | JSON objects (and arrays) are self-delimiting, so you can write JSON at |
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491 | one end of a handle and read them at the other end without using any |
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492 | additional framing. |
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493 | |
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494 | The generated JSON text is guaranteed not to contain any newlines: While |
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495 | this module doesn't need delimiters after or between JSON texts to be |
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496 | able to read them, many other languages depend on that. |
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497 | |
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498 | A simple RPC protocol that interoperates easily with others is to send |
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499 | JSON arrays (or objects, although arrays are usually the better choice as |
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500 | they mimic how function argument passing works) and a newline after each |
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501 | JSON text: |
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502 | |
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503 | $handle->push_write (json => ["method", "arg1", "arg2"]); # whatever |
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504 | $handle->push_write ("\012"); |
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505 | |
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506 | An AnyEvent::Handle receiver would simply use the C<json> read type and |
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507 | rely on the fact that the newline will be skipped as leading whitespace: |
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508 | |
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509 | $handle->push_read (json => sub { my $array = $_[1]; ... }); |
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510 | |
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511 | Other languages could read single lines terminated by a newline and pass |
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512 | this line into their JSON decoder of choice. |
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513 | |
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514 | =cut |
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515 | |
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516 | register_write_type json => sub { |
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517 | my ($self, $ref) = @_; |
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518 | |
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519 | require JSON; |
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520 | |
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521 | $self->{json} ? $self->{json}->encode ($ref) |
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522 | : JSON::encode_json ($ref) |
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523 | }; |
|
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524 | |
368 | =item AnyEvent::Handle::register_write_type type => $coderef->($self, @args) |
525 | =item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args) |
369 | |
526 | |
370 | This function (not method) lets you add your own types to C<push_write>. |
527 | This function (not method) lets you add your own types to C<push_write>. |
371 | Whenever the given C<type> is used, C<push_write> will invoke the code |
528 | Whenever the given C<type> is used, C<push_write> will invoke the code |
372 | reference with the handle object and the remaining arguments. |
529 | reference with the handle object and the remaining arguments. |
373 | |
530 | |
… | |
… | |
464 | |
621 | |
465 | if ( |
622 | if ( |
466 | defined $self->{rbuf_max} |
623 | defined $self->{rbuf_max} |
467 | && $self->{rbuf_max} < length $self->{rbuf} |
624 | && $self->{rbuf_max} < length $self->{rbuf} |
468 | ) { |
625 | ) { |
469 | $! = &Errno::ENOSPC; return $self->error; |
626 | $! = &Errno::ENOSPC; |
|
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627 | $self->error; |
470 | } |
628 | } |
471 | |
629 | |
472 | return if $self->{in_drain}; |
630 | return if $self->{in_drain}; |
473 | local $self->{in_drain} = 1; |
631 | local $self->{in_drain} = 1; |
474 | |
632 | |
475 | while (my $len = length $self->{rbuf}) { |
633 | while (my $len = length $self->{rbuf}) { |
476 | no strict 'refs'; |
634 | no strict 'refs'; |
477 | if (my $cb = shift @{ $self->{queue} }) { |
635 | if (my $cb = shift @{ $self->{_queue} }) { |
478 | unless ($cb->($self)) { |
636 | unless ($cb->($self)) { |
479 | if ($self->{eof}) { |
637 | if ($self->{_eof}) { |
480 | # no progress can be made (not enough data and no data forthcoming) |
638 | # no progress can be made (not enough data and no data forthcoming) |
481 | $! = &Errno::EPIPE; return $self->error; |
639 | $! = &Errno::EPIPE; |
|
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640 | $self->error; |
482 | } |
641 | } |
483 | |
642 | |
484 | unshift @{ $self->{queue} }, $cb; |
643 | unshift @{ $self->{_queue} }, $cb; |
485 | return; |
644 | return; |
486 | } |
645 | } |
487 | } elsif ($self->{on_read}) { |
646 | } elsif ($self->{on_read}) { |
488 | $self->{on_read}($self); |
647 | $self->{on_read}($self); |
489 | |
648 | |
490 | if ( |
649 | if ( |
491 | $self->{eof} # if no further data will arrive |
650 | $self->{_eof} # if no further data will arrive |
492 | && $len == length $self->{rbuf} # and no data has been consumed |
651 | && $len == length $self->{rbuf} # and no data has been consumed |
493 | && !@{ $self->{queue} } # and the queue is still empty |
652 | && !@{ $self->{_queue} } # and the queue is still empty |
494 | && $self->{on_read} # and we still want to read data |
653 | && $self->{on_read} # and we still want to read data |
495 | ) { |
654 | ) { |
496 | # then no progress can be made |
655 | # then no progress can be made |
497 | $! = &Errno::EPIPE; return $self->error; |
656 | $! = &Errno::EPIPE; |
|
|
657 | $self->error; |
498 | } |
658 | } |
499 | } else { |
659 | } else { |
500 | # read side becomes idle |
660 | # read side becomes idle |
501 | delete $self->{rw}; |
661 | delete $self->{_rw}; |
502 | return; |
662 | return; |
503 | } |
663 | } |
504 | } |
664 | } |
505 | |
665 | |
506 | if ($self->{eof}) { |
666 | if ($self->{_eof}) { |
507 | $self->_shutdown; |
667 | $self->_shutdown; |
508 | $self->{on_eof}($self) |
668 | $self->{on_eof}($self) |
509 | if $self->{on_eof}; |
669 | if $self->{on_eof}; |
510 | } |
670 | } |
511 | } |
671 | } |
… | |
… | |
577 | |
737 | |
578 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read") |
738 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read") |
579 | ->($self, $cb, @_); |
739 | ->($self, $cb, @_); |
580 | } |
740 | } |
581 | |
741 | |
582 | push @{ $self->{queue} }, $cb; |
742 | push @{ $self->{_queue} }, $cb; |
583 | $self->_drain_rbuf; |
743 | $self->_drain_rbuf; |
584 | } |
744 | } |
585 | |
745 | |
586 | sub unshift_read { |
746 | sub unshift_read { |
587 | my $self = shift; |
747 | my $self = shift; |
… | |
… | |
593 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read") |
753 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read") |
594 | ->($self, $cb, @_); |
754 | ->($self, $cb, @_); |
595 | } |
755 | } |
596 | |
756 | |
597 | |
757 | |
598 | unshift @{ $self->{queue} }, $cb; |
758 | unshift @{ $self->{_queue} }, $cb; |
599 | $self->_drain_rbuf; |
759 | $self->_drain_rbuf; |
600 | } |
760 | } |
601 | |
761 | |
602 | =item $handle->push_read (type => @args, $cb) |
762 | =item $handle->push_read (type => @args, $cb) |
603 | |
763 | |
… | |
… | |
610 | Predefined types are (if you have ideas for additional types, feel free to |
770 | Predefined types are (if you have ideas for additional types, feel free to |
611 | drop by and tell us): |
771 | drop by and tell us): |
612 | |
772 | |
613 | =over 4 |
773 | =over 4 |
614 | |
774 | |
615 | =item chunk => $octets, $cb->($self, $data) |
775 | =item chunk => $octets, $cb->($handle, $data) |
616 | |
776 | |
617 | Invoke the callback only once C<$octets> bytes have been read. Pass the |
777 | Invoke the callback only once C<$octets> bytes have been read. Pass the |
618 | data read to the callback. The callback will never be called with less |
778 | data read to the callback. The callback will never be called with less |
619 | data. |
779 | data. |
620 | |
780 | |
… | |
… | |
643 | |
803 | |
644 | sub unshift_read_chunk { |
804 | sub unshift_read_chunk { |
645 | $_[0]->unshift_read (chunk => $_[1], $_[2]); |
805 | $_[0]->unshift_read (chunk => $_[1], $_[2]); |
646 | } |
806 | } |
647 | |
807 | |
648 | =item line => [$eol, ]$cb->($self, $line, $eol) |
808 | =item line => [$eol, ]$cb->($handle, $line, $eol) |
649 | |
809 | |
650 | The callback will be called only once a full line (including the end of |
810 | The callback will be called only once a full line (including the end of |
651 | line marker, C<$eol>) has been read. This line (excluding the end of line |
811 | line marker, C<$eol>) has been read. This line (excluding the end of line |
652 | marker) will be passed to the callback as second argument (C<$line>), and |
812 | marker) will be passed to the callback as second argument (C<$line>), and |
653 | the end of line marker as the third argument (C<$eol>). |
813 | the end of line marker as the third argument (C<$eol>). |
… | |
… | |
690 | sub unshift_read_line { |
850 | sub unshift_read_line { |
691 | my $self = shift; |
851 | my $self = shift; |
692 | $self->unshift_read (line => @_); |
852 | $self->unshift_read (line => @_); |
693 | } |
853 | } |
694 | |
854 | |
695 | =item netstring => $cb->($string) |
855 | =item netstring => $cb->($handle, $string) |
696 | |
856 | |
697 | A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement). |
857 | A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement). |
698 | |
858 | |
699 | Throws an error with C<$!> set to EBADMSG on format violations. |
859 | Throws an error with C<$!> set to EBADMSG on format violations. |
700 | |
860 | |
… | |
… | |
728 | |
888 | |
729 | 1 |
889 | 1 |
730 | } |
890 | } |
731 | }; |
891 | }; |
732 | |
892 | |
|
|
893 | =item regex => $accept[, $reject[, $skip], $cb->($handle, $data) |
|
|
894 | |
|
|
895 | Makes a regex match against the regex object C<$accept> and returns |
|
|
896 | everything up to and including the match. |
|
|
897 | |
|
|
898 | Example: read a single line terminated by '\n'. |
|
|
899 | |
|
|
900 | $handle->push_read (regex => qr<\n>, sub { ... }); |
|
|
901 | |
|
|
902 | If C<$reject> is given and not undef, then it determines when the data is |
|
|
903 | to be rejected: it is matched against the data when the C<$accept> regex |
|
|
904 | does not match and generates an C<EBADMSG> error when it matches. This is |
|
|
905 | useful to quickly reject wrong data (to avoid waiting for a timeout or a |
|
|
906 | receive buffer overflow). |
|
|
907 | |
|
|
908 | Example: expect a single decimal number followed by whitespace, reject |
|
|
909 | anything else (not the use of an anchor). |
|
|
910 | |
|
|
911 | $handle->push_read (regex => qr<^[0-9]+\s>, qr<[^0-9]>, sub { ... }); |
|
|
912 | |
|
|
913 | If C<$skip> is given and not C<undef>, then it will be matched against |
|
|
914 | the receive buffer when neither C<$accept> nor C<$reject> match, |
|
|
915 | and everything preceding and including the match will be accepted |
|
|
916 | unconditionally. This is useful to skip large amounts of data that you |
|
|
917 | know cannot be matched, so that the C<$accept> or C<$reject> regex do not |
|
|
918 | have to start matching from the beginning. This is purely an optimisation |
|
|
919 | and is usually worth only when you expect more than a few kilobytes. |
|
|
920 | |
|
|
921 | Example: expect a http header, which ends at C<\015\012\015\012>. Since we |
|
|
922 | expect the header to be very large (it isn't in practise, but...), we use |
|
|
923 | a skip regex to skip initial portions. The skip regex is tricky in that |
|
|
924 | it only accepts something not ending in either \015 or \012, as these are |
|
|
925 | required for the accept regex. |
|
|
926 | |
|
|
927 | $handle->push_read (regex => |
|
|
928 | qr<\015\012\015\012>, |
|
|
929 | undef, # no reject |
|
|
930 | qr<^.*[^\015\012]>, |
|
|
931 | sub { ... }); |
|
|
932 | |
|
|
933 | =cut |
|
|
934 | |
|
|
935 | register_read_type regex => sub { |
|
|
936 | my ($self, $cb, $accept, $reject, $skip) = @_; |
|
|
937 | |
|
|
938 | my $data; |
|
|
939 | my $rbuf = \$self->{rbuf}; |
|
|
940 | |
|
|
941 | sub { |
|
|
942 | # accept |
|
|
943 | if ($$rbuf =~ $accept) { |
|
|
944 | $data .= substr $$rbuf, 0, $+[0], ""; |
|
|
945 | $cb->($self, $data); |
|
|
946 | return 1; |
|
|
947 | } |
|
|
948 | |
|
|
949 | # reject |
|
|
950 | if ($reject && $$rbuf =~ $reject) { |
|
|
951 | $! = &Errno::EBADMSG; |
|
|
952 | $self->error; |
|
|
953 | } |
|
|
954 | |
|
|
955 | # skip |
|
|
956 | if ($skip && $$rbuf =~ $skip) { |
|
|
957 | $data .= substr $$rbuf, 0, $+[0], ""; |
|
|
958 | } |
|
|
959 | |
|
|
960 | () |
|
|
961 | } |
|
|
962 | }; |
|
|
963 | |
|
|
964 | =item json => $cb->($handle, $hash_or_arrayref) |
|
|
965 | |
|
|
966 | Reads a JSON object or array, decodes it and passes it to the callback. |
|
|
967 | |
|
|
968 | If a C<json> object was passed to the constructor, then that will be used |
|
|
969 | for the final decode, otherwise it will create a JSON coder expecting UTF-8. |
|
|
970 | |
|
|
971 | This read type uses the incremental parser available with JSON version |
|
|
972 | 2.09 (and JSON::XS version 2.2) and above. You have to provide a |
|
|
973 | dependency on your own: this module will load the JSON module, but |
|
|
974 | AnyEvent does not depend on it itself. |
|
|
975 | |
|
|
976 | Since JSON texts are fully self-delimiting, the C<json> read and write |
|
|
977 | types are an ideal simple RPC protocol: just exchange JSON datagrams. See |
|
|
978 | the C<json> write type description, above, for an actual example. |
|
|
979 | |
|
|
980 | =cut |
|
|
981 | |
|
|
982 | register_read_type json => sub { |
|
|
983 | my ($self, $cb, $accept, $reject, $skip) = @_; |
|
|
984 | |
|
|
985 | require JSON; |
|
|
986 | |
|
|
987 | my $data; |
|
|
988 | my $rbuf = \$self->{rbuf}; |
|
|
989 | |
|
|
990 | my $json = $self->{json} ||= JSON->new->utf8; |
|
|
991 | |
|
|
992 | sub { |
|
|
993 | my $ref = $json->incr_parse ($self->{rbuf}); |
|
|
994 | |
|
|
995 | if ($ref) { |
|
|
996 | $self->{rbuf} = $json->incr_text; |
|
|
997 | $json->incr_text = ""; |
|
|
998 | $cb->($self, $ref); |
|
|
999 | |
|
|
1000 | 1 |
|
|
1001 | } else { |
|
|
1002 | $self->{rbuf} = ""; |
|
|
1003 | () |
|
|
1004 | } |
|
|
1005 | } |
|
|
1006 | }; |
|
|
1007 | |
733 | =back |
1008 | =back |
734 | |
1009 | |
735 | =item AnyEvent::Handle::register_read_type type => $coderef->($self, $cb, @args) |
1010 | =item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args) |
736 | |
1011 | |
737 | This function (not method) lets you add your own types to C<push_read>. |
1012 | This function (not method) lets you add your own types to C<push_read>. |
738 | |
1013 | |
739 | Whenever the given C<type> is used, C<push_read> will invoke the code |
1014 | Whenever the given C<type> is used, C<push_read> will invoke the code |
740 | reference with the handle object, the callback and the remaining |
1015 | reference with the handle object, the callback and the remaining |
… | |
… | |
742 | |
1017 | |
743 | The code reference is supposed to return a callback (usually a closure) |
1018 | The code reference is supposed to return a callback (usually a closure) |
744 | that works as a plain read callback (see C<< ->push_read ($cb) >>). |
1019 | that works as a plain read callback (see C<< ->push_read ($cb) >>). |
745 | |
1020 | |
746 | It should invoke the passed callback when it is done reading (remember to |
1021 | It should invoke the passed callback when it is done reading (remember to |
747 | pass C<$self> as first argument as all other callbacks do that). |
1022 | pass C<$handle> as first argument as all other callbacks do that). |
748 | |
1023 | |
749 | Note that this is a function, and all types registered this way will be |
1024 | Note that this is a function, and all types registered this way will be |
750 | global, so try to use unique names. |
1025 | global, so try to use unique names. |
751 | |
1026 | |
752 | For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>, |
1027 | For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>, |
… | |
… | |
764 | =cut |
1039 | =cut |
765 | |
1040 | |
766 | sub stop_read { |
1041 | sub stop_read { |
767 | my ($self) = @_; |
1042 | my ($self) = @_; |
768 | |
1043 | |
769 | delete $self->{rw}; |
1044 | delete $self->{_rw}; |
770 | } |
1045 | } |
771 | |
1046 | |
772 | sub start_read { |
1047 | sub start_read { |
773 | my ($self) = @_; |
1048 | my ($self) = @_; |
774 | |
1049 | |
775 | unless ($self->{rw} || $self->{eof}) { |
1050 | unless ($self->{_rw} || $self->{_eof}) { |
776 | Scalar::Util::weaken $self; |
1051 | Scalar::Util::weaken $self; |
777 | |
1052 | |
778 | $self->{rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
1053 | $self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
779 | my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf}; |
1054 | my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf}; |
780 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
1055 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
781 | |
1056 | |
782 | if ($len > 0) { |
1057 | if ($len > 0) { |
|
|
1058 | $self->{_activity} = AnyEvent->now; |
|
|
1059 | |
783 | $self->{filter_r} |
1060 | $self->{filter_r} |
784 | ? $self->{filter_r}->($self, $rbuf) |
1061 | ? $self->{filter_r}->($self, $rbuf) |
785 | : $self->_drain_rbuf; |
1062 | : $self->_drain_rbuf; |
786 | |
1063 | |
787 | } elsif (defined $len) { |
1064 | } elsif (defined $len) { |
788 | delete $self->{rw}; |
1065 | delete $self->{_rw}; |
789 | $self->{eof} = 1; |
1066 | $self->{_eof} = 1; |
790 | $self->_drain_rbuf; |
1067 | $self->_drain_rbuf; |
791 | |
1068 | |
792 | } elsif ($! != EAGAIN && $! != EINTR && $! != &AnyEvent::Util::WSAWOULDBLOCK) { |
1069 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
793 | return $self->error; |
1070 | return $self->error; |
794 | } |
1071 | } |
795 | }); |
1072 | }); |
796 | } |
1073 | } |
797 | } |
1074 | } |
798 | |
1075 | |
799 | sub _dotls { |
1076 | sub _dotls { |
800 | my ($self) = @_; |
1077 | my ($self) = @_; |
801 | |
1078 | |
802 | if (length $self->{tls_wbuf}) { |
1079 | if (length $self->{_tls_wbuf}) { |
803 | while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{tls_wbuf})) > 0) { |
1080 | while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) { |
804 | substr $self->{tls_wbuf}, 0, $len, ""; |
1081 | substr $self->{_tls_wbuf}, 0, $len, ""; |
805 | } |
1082 | } |
806 | } |
1083 | } |
807 | |
1084 | |
808 | if (defined (my $buf = Net::SSLeay::BIO_read ($self->{tls_wbio}))) { |
1085 | if (defined (my $buf = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
809 | $self->{wbuf} .= $buf; |
1086 | $self->{wbuf} .= $buf; |
810 | $self->_drain_wbuf; |
1087 | $self->_drain_wbuf; |
811 | } |
1088 | } |
812 | |
1089 | |
813 | while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) { |
1090 | while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) { |
… | |
… | |
839 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
1116 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
840 | |
1117 | |
841 | The second argument is the optional C<Net::SSLeay::CTX> object that is |
1118 | The second argument is the optional C<Net::SSLeay::CTX> object that is |
842 | used when AnyEvent::Handle has to create its own TLS connection object. |
1119 | used when AnyEvent::Handle has to create its own TLS connection object. |
843 | |
1120 | |
|
|
1121 | The TLS connection object will end up in C<< $handle->{tls} >> after this |
|
|
1122 | call and can be used or changed to your liking. Note that the handshake |
|
|
1123 | might have already started when this function returns. |
|
|
1124 | |
844 | =cut |
1125 | =cut |
845 | |
1126 | |
846 | # TODO: maybe document... |
1127 | # TODO: maybe document... |
847 | sub starttls { |
1128 | sub starttls { |
848 | my ($self, $ssl, $ctx) = @_; |
1129 | my ($self, $ssl, $ctx) = @_; |
… | |
… | |
863 | # but the openssl maintainers basically said: "trust us, it just works". |
1144 | # but the openssl maintainers basically said: "trust us, it just works". |
864 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
1145 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
865 | # and mismaintained ssleay-module doesn't even offer them). |
1146 | # and mismaintained ssleay-module doesn't even offer them). |
866 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
1147 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
867 | Net::SSLeay::CTX_set_mode ($self->{tls}, |
1148 | Net::SSLeay::CTX_set_mode ($self->{tls}, |
868 | (eval { Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
1149 | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
869 | | (eval { Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
1150 | | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
870 | |
1151 | |
871 | $self->{tls_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1152 | $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
872 | $self->{tls_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1153 | $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
873 | |
1154 | |
874 | Net::SSLeay::set_bio ($ssl, $self->{tls_rbio}, $self->{tls_wbio}); |
1155 | Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio}); |
875 | |
1156 | |
876 | $self->{filter_w} = sub { |
1157 | $self->{filter_w} = sub { |
877 | $_[0]{tls_wbuf} .= ${$_[1]}; |
1158 | $_[0]{_tls_wbuf} .= ${$_[1]}; |
878 | &_dotls; |
1159 | &_dotls; |
879 | }; |
1160 | }; |
880 | $self->{filter_r} = sub { |
1161 | $self->{filter_r} = sub { |
881 | Net::SSLeay::BIO_write ($_[0]{tls_rbio}, ${$_[1]}); |
1162 | Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]}); |
882 | &_dotls; |
1163 | &_dotls; |
883 | }; |
1164 | }; |
884 | } |
1165 | } |
885 | |
1166 | |
886 | =item $handle->stoptls |
1167 | =item $handle->stoptls |
… | |
… | |
892 | |
1173 | |
893 | sub stoptls { |
1174 | sub stoptls { |
894 | my ($self) = @_; |
1175 | my ($self) = @_; |
895 | |
1176 | |
896 | Net::SSLeay::free (delete $self->{tls}) if $self->{tls}; |
1177 | Net::SSLeay::free (delete $self->{tls}) if $self->{tls}; |
|
|
1178 | |
897 | delete $self->{tls_rbio}; |
1179 | delete $self->{_rbio}; |
898 | delete $self->{tls_wbio}; |
1180 | delete $self->{_wbio}; |
899 | delete $self->{tls_wbuf}; |
1181 | delete $self->{_tls_wbuf}; |
900 | delete $self->{filter_r}; |
1182 | delete $self->{filter_r}; |
901 | delete $self->{filter_w}; |
1183 | delete $self->{filter_w}; |
902 | } |
1184 | } |
903 | |
1185 | |
904 | sub DESTROY { |
1186 | sub DESTROY { |
… | |
… | |
942 | } |
1224 | } |
943 | } |
1225 | } |
944 | |
1226 | |
945 | =back |
1227 | =back |
946 | |
1228 | |
|
|
1229 | =head1 SUBCLASSING AnyEvent::Handle |
|
|
1230 | |
|
|
1231 | In many cases, you might want to subclass AnyEvent::Handle. |
|
|
1232 | |
|
|
1233 | To make this easier, a given version of AnyEvent::Handle uses these |
|
|
1234 | conventions: |
|
|
1235 | |
|
|
1236 | =over 4 |
|
|
1237 | |
|
|
1238 | =item * all constructor arguments become object members. |
|
|
1239 | |
|
|
1240 | At least initially, when you pass a C<tls>-argument to the constructor it |
|
|
1241 | will end up in C<< $handle->{tls} >>. Those members might be changes or |
|
|
1242 | mutated later on (for example C<tls> will hold the TLS connection object). |
|
|
1243 | |
|
|
1244 | =item * other object member names are prefixed with an C<_>. |
|
|
1245 | |
|
|
1246 | All object members not explicitly documented (internal use) are prefixed |
|
|
1247 | with an underscore character, so the remaining non-C<_>-namespace is free |
|
|
1248 | for use for subclasses. |
|
|
1249 | |
|
|
1250 | =item * all members not documented here and not prefixed with an underscore |
|
|
1251 | are free to use in subclasses. |
|
|
1252 | |
|
|
1253 | Of course, new versions of AnyEvent::Handle may introduce more "public" |
|
|
1254 | member variables, but thats just life, at least it is documented. |
|
|
1255 | |
|
|
1256 | =back |
|
|
1257 | |
947 | =head1 AUTHOR |
1258 | =head1 AUTHOR |
948 | |
1259 | |
949 | Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>. |
1260 | Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>. |
950 | |
1261 | |
951 | =cut |
1262 | =cut |