… | |
… | |
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 (); |
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 | |
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17 | This module is experimental. |
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18 | |
16 | |
19 | =cut |
17 | =cut |
20 | |
18 | |
21 | our $VERSION = '0.04'; |
19 | our $VERSION = '0.04'; |
22 | |
20 | |
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25 | use AnyEvent; |
23 | use AnyEvent; |
26 | use AnyEvent::Handle; |
24 | use AnyEvent::Handle; |
27 | |
25 | |
28 | my $cv = AnyEvent->condvar; |
26 | my $cv = AnyEvent->condvar; |
29 | |
27 | |
30 | my $ae_fh = AnyEvent::Handle->new (fh => \*STDIN); |
28 | my $handle = |
31 | |
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32 | #TODO |
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33 | |
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34 | # or use the constructor to pass the callback: |
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35 | |
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36 | my $ae_fh2 = |
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37 | AnyEvent::Handle->new ( |
29 | AnyEvent::Handle->new ( |
38 | fh => \*STDIN, |
30 | fh => \*STDIN, |
39 | on_eof => sub { |
31 | on_eof => sub { |
40 | $cv->broadcast; |
32 | $cv->broadcast; |
41 | }, |
33 | }, |
42 | #TODO |
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43 | ); |
34 | ); |
44 | |
35 | |
45 | $cv->wait; |
36 | # send some request line |
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37 | $handle->push_write ("getinfo\015\012"); |
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38 | |
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39 | # read the response line |
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40 | $handle->push_read (line => sub { |
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41 | my ($handle, $line) = @_; |
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42 | warn "read line <$line>\n"; |
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43 | $cv->send; |
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44 | }); |
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45 | |
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46 | $cv->recv; |
46 | |
47 | |
47 | =head1 DESCRIPTION |
48 | =head1 DESCRIPTION |
48 | |
49 | |
49 | 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 |
50 | filehandles. For utility functions for doing non-blocking connects and accepts |
51 | filehandles. For utility functions for doing non-blocking connects and accepts |
… | |
… | |
72 | The filehandle this L<AnyEvent::Handle> object will operate on. |
73 | The filehandle this L<AnyEvent::Handle> object will operate on. |
73 | |
74 | |
74 | NOTE: The filehandle will be set to non-blocking (using |
75 | NOTE: The filehandle will be set to non-blocking (using |
75 | AnyEvent::Util::fh_nonblocking). |
76 | AnyEvent::Util::fh_nonblocking). |
76 | |
77 | |
77 | =item on_eof => $cb->($self) |
78 | =item on_eof => $cb->($handle) |
78 | |
79 | |
79 | Set the callback to be called on EOF. |
80 | Set the callback to be called on EOF. |
80 | |
81 | |
81 | 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, |
82 | 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 |
83 | waiting for data. |
84 | waiting for data. |
84 | |
85 | |
85 | =item on_error => $cb->($self) |
86 | =item on_error => $cb->($handle) |
86 | |
87 | |
87 | 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 |
88 | 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 |
89 | or a read error. |
90 | or a read error. |
90 | |
91 | |
91 | 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 |
92 | called. |
93 | called. |
93 | |
94 | |
94 | On callback entrance, the value of C<$!> contains the operating system |
95 | On callback entrance, the value of C<$!> contains the operating system |
95 | error (or C<ENOSPC> or C<EPIPE>). |
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. |
96 | |
100 | |
97 | 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 |
98 | 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 |
99 | die. |
103 | die. |
100 | |
104 | |
101 | =item on_read => $cb->($self) |
105 | =item on_read => $cb->($handle) |
102 | |
106 | |
103 | 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 |
104 | and no read request is in the queue. |
108 | and no read request is in the queue. |
105 | |
109 | |
106 | 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 >> |
107 | method or access the C<$self->{rbuf}> member directly. |
111 | method or access the C<$handle->{rbuf}> member directly. |
108 | |
112 | |
109 | 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 |
110 | 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 |
111 | 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 |
112 | error will be raised (with C<$!> set to C<EPIPE>). |
116 | error will be raised (with C<$!> set to C<EPIPE>). |
113 | |
117 | |
114 | =item on_drain => $cb->() |
118 | =item on_drain => $cb->($handle) |
115 | |
119 | |
116 | 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 |
117 | (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). |
118 | |
122 | |
119 | 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. |
120 | |
144 | |
121 | =item rbuf_max => <bytes> |
145 | =item rbuf_max => <bytes> |
122 | |
146 | |
123 | 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>) |
124 | 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 |
… | |
… | |
131 | isn't finished). |
155 | isn't finished). |
132 | |
156 | |
133 | =item read_size => <bytes> |
157 | =item read_size => <bytes> |
134 | |
158 | |
135 | 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 |
136 | on each [loop iteration). Default: C<4096>. |
160 | during each (loop iteration). Default: C<8192>. |
137 | |
161 | |
138 | =item low_water_mark => <bytes> |
162 | =item low_water_mark => <bytes> |
139 | |
163 | |
140 | 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 |
141 | 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 |
… | |
… | |
164 | |
188 | |
165 | 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 |
166 | (unless a connection object was specified directly). If this parameter is |
190 | (unless a connection object was specified directly). If this parameter is |
167 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
191 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
168 | |
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 | |
169 | =back |
209 | =back |
170 | |
210 | |
171 | =cut |
211 | =cut |
172 | |
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173 | our (%RH, %WH); |
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174 | |
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175 | sub register_read_type($$) { |
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176 | $RH{$_[0]} = $_[1]; |
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177 | } |
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178 | |
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179 | sub register_write_type($$) { |
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180 | $WH{$_[0]} = $_[1]; |
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181 | } |
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182 | |
212 | |
183 | sub new { |
213 | sub new { |
184 | my $class = shift; |
214 | my $class = shift; |
185 | |
215 | |
186 | my $self = bless { @_ }, $class; |
216 | my $self = bless { @_ }, $class; |
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192 | if ($self->{tls}) { |
222 | if ($self->{tls}) { |
193 | require Net::SSLeay; |
223 | require Net::SSLeay; |
194 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}); |
224 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}); |
195 | } |
225 | } |
196 | |
226 | |
197 | $self->on_eof (delete $self->{on_eof} ) if $self->{on_eof}; |
227 | # $self->on_eof (delete $self->{on_eof} ) if $self->{on_eof}; # nop |
198 | $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 |
199 | $self->on_drain (delete $self->{on_drain}) if $self->{on_drain}; |
230 | $self->on_drain (delete $self->{on_drain}) if $self->{on_drain}; |
200 | $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; |
201 | |
234 | |
202 | $self->start_read; |
235 | $self->start_read; |
203 | |
236 | |
204 | $self |
237 | $self |
205 | } |
238 | } |
206 | |
239 | |
207 | sub _shutdown { |
240 | sub _shutdown { |
208 | my ($self) = @_; |
241 | my ($self) = @_; |
209 | |
242 | |
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243 | delete $self->{_tw}; |
210 | delete $self->{rw}; |
244 | delete $self->{_rw}; |
211 | delete $self->{ww}; |
245 | delete $self->{_ww}; |
212 | delete $self->{fh}; |
246 | delete $self->{fh}; |
213 | } |
247 | } |
214 | |
248 | |
215 | sub error { |
249 | sub error { |
216 | my ($self) = @_; |
250 | my ($self) = @_; |
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… | |
218 | { |
252 | { |
219 | local $!; |
253 | local $!; |
220 | $self->_shutdown; |
254 | $self->_shutdown; |
221 | } |
255 | } |
222 | |
256 | |
223 | if ($self->{on_error}) { |
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224 | $self->{on_error}($self); |
257 | $self->{on_error}($self) |
225 | } else { |
258 | if $self->{on_error}; |
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259 | |
226 | die "AnyEvent::Handle uncaught fatal error: $!"; |
260 | Carp::croak "AnyEvent::Handle uncaught fatal error: $!"; |
227 | } |
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228 | } |
261 | } |
229 | |
262 | |
230 | =item $fh = $handle->fh |
263 | =item $fh = $handle->fh |
231 | |
264 | |
232 | 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. |
233 | |
266 | |
234 | =cut |
267 | =cut |
235 | |
268 | |
236 | sub fh { $_[0]->{fh} } |
269 | sub fh { $_[0]{fh} } |
237 | |
270 | |
238 | =item $handle->on_error ($cb) |
271 | =item $handle->on_error ($cb) |
239 | |
272 | |
240 | 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). |
241 | |
274 | |
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251 | |
284 | |
252 | =cut |
285 | =cut |
253 | |
286 | |
254 | sub on_eof { |
287 | sub on_eof { |
255 | $_[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 $self->{_tw}; |
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355 | } |
256 | } |
356 | } |
257 | |
357 | |
258 | ############################################################################# |
358 | ############################################################################# |
259 | |
359 | |
260 | =back |
360 | =back |
… | |
… | |
297 | =cut |
397 | =cut |
298 | |
398 | |
299 | sub _drain_wbuf { |
399 | sub _drain_wbuf { |
300 | my ($self) = @_; |
400 | my ($self) = @_; |
301 | |
401 | |
302 | unless ($self->{ww}) { |
402 | if (!$self->{_ww} && length $self->{wbuf}) { |
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403 | |
303 | Scalar::Util::weaken $self; |
404 | Scalar::Util::weaken $self; |
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405 | |
304 | my $cb = sub { |
406 | my $cb = sub { |
305 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
407 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
306 | |
408 | |
307 | if ($len > 0) { |
409 | if ($len >= 0) { |
308 | 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; |
309 | |
413 | |
310 | $self->{on_drain}($self) |
414 | $self->{on_drain}($self) |
311 | if $self->{low_water_mark} >= length $self->{wbuf} |
415 | if $self->{low_water_mark} >= length $self->{wbuf} |
312 | && $self->{on_drain}; |
416 | && $self->{on_drain}; |
313 | |
417 | |
314 | delete $self->{ww} unless length $self->{wbuf}; |
418 | delete $self->{_ww} unless length $self->{wbuf}; |
315 | } elsif ($! != EAGAIN && $! != EINTR) { |
419 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
316 | $self->error; |
420 | $self->error; |
317 | } |
421 | } |
318 | }; |
422 | }; |
319 | |
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 |
320 | $self->{ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb); |
428 | $self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb) |
321 | |
429 | if length $self->{wbuf}; |
322 | $cb->($self); |
|
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323 | }; |
430 | }; |
|
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431 | } |
|
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432 | |
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433 | our %WH; |
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434 | |
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435 | sub register_write_type($$) { |
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436 | $WH{$_[0]} = $_[1]; |
324 | } |
437 | } |
325 | |
438 | |
326 | sub push_write { |
439 | sub push_write { |
327 | my $self = shift; |
440 | my $self = shift; |
|
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441 | |
|
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442 | if (@_ > 1) { |
|
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443 | my $type = shift; |
|
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444 | |
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445 | @_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write") |
|
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446 | ->($self, @_); |
|
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447 | } |
328 | |
448 | |
329 | if ($self->{filter_w}) { |
449 | if ($self->{filter_w}) { |
330 | $self->{filter_w}->($self, \$_[0]); |
450 | $self->{filter_w}->($self, \$_[0]); |
331 | } else { |
451 | } else { |
332 | $self->{wbuf} .= $_[0]; |
452 | $self->{wbuf} .= $_[0]; |
333 | $self->_drain_wbuf; |
453 | $self->_drain_wbuf; |
334 | } |
454 | } |
335 | } |
455 | } |
|
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456 | |
|
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457 | =item $handle->push_write (type => @args) |
|
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458 | |
|
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459 | =item $handle->unshift_write (type => @args) |
|
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460 | |
|
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461 | Instead of formatting your data yourself, you can also let this module do |
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462 | the job by specifying a type and type-specific arguments. |
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463 | |
|
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464 | Predefined types are (if you have ideas for additional types, feel free to |
|
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465 | drop by and tell us): |
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466 | |
|
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467 | =over 4 |
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468 | |
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469 | =item netstring => $string |
|
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470 | |
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471 | Formats the given value as netstring |
|
|
472 | (http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them). |
|
|
473 | |
|
|
474 | =back |
|
|
475 | |
|
|
476 | =cut |
|
|
477 | |
|
|
478 | register_write_type netstring => sub { |
|
|
479 | my ($self, $string) = @_; |
|
|
480 | |
|
|
481 | sprintf "%d:%s,", (length $string), $string |
|
|
482 | }; |
|
|
483 | |
|
|
484 | =item json => $array_or_hashref |
|
|
485 | |
|
|
486 | Encodes the given hash or array reference into a JSON object. Unless you |
|
|
487 | provide your own JSON object, this means it will be encoded to JSON text |
|
|
488 | in UTF-8. |
|
|
489 | |
|
|
490 | JSON objects (and arrays) are self-delimiting, so you can write JSON at |
|
|
491 | one end of a handle and read them at the other end without using any |
|
|
492 | additional framing. |
|
|
493 | |
|
|
494 | The generated JSON text is guaranteed not to contain any newlines: While |
|
|
495 | this module doesn't need delimiters after or between JSON texts to be |
|
|
496 | able to read them, many other languages depend on that. |
|
|
497 | |
|
|
498 | A simple RPC protocol that interoperates easily with others is to send |
|
|
499 | JSON arrays (or objects, although arrays are usually the better choice as |
|
|
500 | they mimic how function argument passing works) and a newline after each |
|
|
501 | JSON text: |
|
|
502 | |
|
|
503 | $handle->push_write (json => ["method", "arg1", "arg2"]); # whatever |
|
|
504 | $handle->push_write ("\012"); |
|
|
505 | |
|
|
506 | An AnyEvent::Handle receiver would simply use the C<json> read type and |
|
|
507 | rely on the fact that the newline will be skipped as leading whitespace: |
|
|
508 | |
|
|
509 | $handle->push_read (json => sub { my $array = $_[1]; ... }); |
|
|
510 | |
|
|
511 | Other languages could read single lines terminated by a newline and pass |
|
|
512 | this line into their JSON decoder of choice. |
|
|
513 | |
|
|
514 | =cut |
|
|
515 | |
|
|
516 | register_write_type json => sub { |
|
|
517 | my ($self, $ref) = @_; |
|
|
518 | |
|
|
519 | require JSON; |
|
|
520 | |
|
|
521 | $self->{json} ? $self->{json}->encode ($ref) |
|
|
522 | : JSON::encode_json ($ref) |
|
|
523 | }; |
|
|
524 | |
|
|
525 | =item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args) |
|
|
526 | |
|
|
527 | This function (not method) lets you add your own types to C<push_write>. |
|
|
528 | Whenever the given C<type> is used, C<push_write> will invoke the code |
|
|
529 | reference with the handle object and the remaining arguments. |
|
|
530 | |
|
|
531 | The code reference is supposed to return a single octet string that will |
|
|
532 | be appended to the write buffer. |
|
|
533 | |
|
|
534 | Note that this is a function, and all types registered this way will be |
|
|
535 | global, so try to use unique names. |
|
|
536 | |
|
|
537 | =cut |
336 | |
538 | |
337 | ############################################################################# |
539 | ############################################################################# |
338 | |
540 | |
339 | =back |
541 | =back |
340 | |
542 | |
… | |
… | |
419 | |
621 | |
420 | if ( |
622 | if ( |
421 | defined $self->{rbuf_max} |
623 | defined $self->{rbuf_max} |
422 | && $self->{rbuf_max} < length $self->{rbuf} |
624 | && $self->{rbuf_max} < length $self->{rbuf} |
423 | ) { |
625 | ) { |
424 | $! = &Errno::ENOSPC; return $self->error; |
626 | $! = &Errno::ENOSPC; |
|
|
627 | $self->error; |
425 | } |
628 | } |
426 | |
629 | |
427 | return if $self->{in_drain}; |
630 | return if $self->{in_drain}; |
428 | local $self->{in_drain} = 1; |
631 | local $self->{in_drain} = 1; |
429 | |
632 | |
430 | while (my $len = length $self->{rbuf}) { |
633 | while (my $len = length $self->{rbuf}) { |
431 | no strict 'refs'; |
634 | no strict 'refs'; |
432 | if (my $cb = shift @{ $self->{queue} }) { |
635 | if (my $cb = shift @{ $self->{_queue} }) { |
433 | if (!$cb->($self)) { |
636 | unless ($cb->($self)) { |
434 | if ($self->{eof}) { |
637 | if ($self->{_eof}) { |
435 | # 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) |
436 | $! = &Errno::EPIPE; return $self->error; |
639 | $! = &Errno::EPIPE; |
|
|
640 | $self->error; |
437 | } |
641 | } |
438 | |
642 | |
439 | unshift @{ $self->{queue} }, $cb; |
643 | unshift @{ $self->{_queue} }, $cb; |
440 | return; |
644 | return; |
441 | } |
645 | } |
442 | } elsif ($self->{on_read}) { |
646 | } elsif ($self->{on_read}) { |
443 | $self->{on_read}($self); |
647 | $self->{on_read}($self); |
444 | |
648 | |
445 | if ( |
649 | if ( |
446 | $self->{eof} # if no further data will arrive |
650 | $self->{_eof} # if no further data will arrive |
447 | && $len == length $self->{rbuf} # and no data has been consumed |
651 | && $len == length $self->{rbuf} # and no data has been consumed |
448 | && !@{ $self->{queue} } # and the queue is still empty |
652 | && !@{ $self->{_queue} } # and the queue is still empty |
449 | && $self->{on_read} # and we still want to read data |
653 | && $self->{on_read} # and we still want to read data |
450 | ) { |
654 | ) { |
451 | # then no progress can be made |
655 | # then no progress can be made |
452 | $! = &Errno::EPIPE; return $self->error; |
656 | $! = &Errno::EPIPE; |
|
|
657 | $self->error; |
453 | } |
658 | } |
454 | } else { |
659 | } else { |
455 | # read side becomes idle |
660 | # read side becomes idle |
456 | delete $self->{rw}; |
661 | delete $self->{_rw}; |
457 | return; |
662 | return; |
458 | } |
663 | } |
459 | } |
664 | } |
460 | |
665 | |
461 | if ($self->{eof}) { |
666 | if ($self->{_eof}) { |
462 | $self->_shutdown; |
667 | $self->_shutdown; |
463 | $self->{on_eof}($self) |
668 | $self->{on_eof}($self) |
464 | if $self->{on_eof}; |
669 | if $self->{on_eof}; |
465 | } |
670 | } |
466 | } |
671 | } |
… | |
… | |
515 | interested in (which can be none at all) and return a true value. After returning |
720 | interested in (which can be none at all) and return a true value. After returning |
516 | true, it will be removed from the queue. |
721 | true, it will be removed from the queue. |
517 | |
722 | |
518 | =cut |
723 | =cut |
519 | |
724 | |
|
|
725 | our %RH; |
|
|
726 | |
|
|
727 | sub register_read_type($$) { |
|
|
728 | $RH{$_[0]} = $_[1]; |
|
|
729 | } |
|
|
730 | |
520 | sub push_read { |
731 | sub push_read { |
521 | my $self = shift; |
732 | my $self = shift; |
522 | my $cb = pop; |
733 | my $cb = pop; |
523 | |
734 | |
524 | if (@_) { |
735 | if (@_) { |
… | |
… | |
526 | |
737 | |
527 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read") |
738 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read") |
528 | ->($self, $cb, @_); |
739 | ->($self, $cb, @_); |
529 | } |
740 | } |
530 | |
741 | |
531 | push @{ $self->{queue} }, $cb; |
742 | push @{ $self->{_queue} }, $cb; |
532 | $self->_drain_rbuf; |
743 | $self->_drain_rbuf; |
533 | } |
744 | } |
534 | |
745 | |
535 | sub unshift_read { |
746 | sub unshift_read { |
536 | my $self = shift; |
747 | my $self = shift; |
… | |
… | |
542 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read") |
753 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read") |
543 | ->($self, $cb, @_); |
754 | ->($self, $cb, @_); |
544 | } |
755 | } |
545 | |
756 | |
546 | |
757 | |
547 | unshift @{ $self->{queue} }, $cb; |
758 | unshift @{ $self->{_queue} }, $cb; |
548 | $self->_drain_rbuf; |
759 | $self->_drain_rbuf; |
549 | } |
760 | } |
550 | |
761 | |
551 | =item $handle->push_read (type => @args, $cb) |
762 | =item $handle->push_read (type => @args, $cb) |
552 | |
763 | |
… | |
… | |
554 | |
765 | |
555 | Instead of providing a callback that parses the data itself you can chose |
766 | Instead of providing a callback that parses the data itself you can chose |
556 | between a number of predefined parsing formats, for chunks of data, lines |
767 | between a number of predefined parsing formats, for chunks of data, lines |
557 | etc. |
768 | etc. |
558 | |
769 | |
559 | The types currently supported are: |
770 | Predefined types are (if you have ideas for additional types, feel free to |
|
|
771 | drop by and tell us): |
560 | |
772 | |
561 | =over 4 |
773 | =over 4 |
562 | |
774 | |
563 | =item chunk => $octets, $cb->($self, $data) |
775 | =item chunk => $octets, $cb->($handle, $data) |
564 | |
776 | |
565 | Invoke the callback only once C<$octets> bytes have been read. Pass the |
777 | Invoke the callback only once C<$octets> bytes have been read. Pass the |
566 | 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 |
567 | data. |
779 | data. |
568 | |
780 | |
… | |
… | |
591 | |
803 | |
592 | sub unshift_read_chunk { |
804 | sub unshift_read_chunk { |
593 | $_[0]->unshift_read (chunk => $_[1], $_[2]); |
805 | $_[0]->unshift_read (chunk => $_[1], $_[2]); |
594 | } |
806 | } |
595 | |
807 | |
596 | =item line => [$eol, ]$cb->($self, $line, $eol) |
808 | =item line => [$eol, ]$cb->($handle, $line, $eol) |
597 | |
809 | |
598 | The callback will be called only once a full line (including the end of |
810 | The callback will be called only once a full line (including the end of |
599 | line marker, C<$eol>) has been read. This line (excluding the end of line |
811 | line marker, C<$eol>) has been read. This line (excluding the end of line |
600 | marker) will be passed to the callback as second argument (C<$line>), and |
812 | marker) will be passed to the callback as second argument (C<$line>), and |
601 | the end of line marker as the third argument (C<$eol>). |
813 | the end of line marker as the third argument (C<$eol>). |
… | |
… | |
638 | sub unshift_read_line { |
850 | sub unshift_read_line { |
639 | my $self = shift; |
851 | my $self = shift; |
640 | $self->unshift_read (line => @_); |
852 | $self->unshift_read (line => @_); |
641 | } |
853 | } |
642 | |
854 | |
|
|
855 | =item netstring => $cb->($handle, $string) |
|
|
856 | |
|
|
857 | A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement). |
|
|
858 | |
|
|
859 | Throws an error with C<$!> set to EBADMSG on format violations. |
|
|
860 | |
|
|
861 | =cut |
|
|
862 | |
|
|
863 | register_read_type netstring => sub { |
|
|
864 | my ($self, $cb) = @_; |
|
|
865 | |
|
|
866 | sub { |
|
|
867 | unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) { |
|
|
868 | if ($_[0]{rbuf} =~ /[^0-9]/) { |
|
|
869 | $! = &Errno::EBADMSG; |
|
|
870 | $self->error; |
|
|
871 | } |
|
|
872 | return; |
|
|
873 | } |
|
|
874 | |
|
|
875 | my $len = $1; |
|
|
876 | |
|
|
877 | $self->unshift_read (chunk => $len, sub { |
|
|
878 | my $string = $_[1]; |
|
|
879 | $_[0]->unshift_read (chunk => 1, sub { |
|
|
880 | if ($_[1] eq ",") { |
|
|
881 | $cb->($_[0], $string); |
|
|
882 | } else { |
|
|
883 | $! = &Errno::EBADMSG; |
|
|
884 | $self->error; |
|
|
885 | } |
|
|
886 | }); |
|
|
887 | }); |
|
|
888 | |
|
|
889 | 1 |
|
|
890 | } |
|
|
891 | }; |
|
|
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 | |
643 | =back |
1008 | =back |
|
|
1009 | |
|
|
1010 | =item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args) |
|
|
1011 | |
|
|
1012 | This function (not method) lets you add your own types to C<push_read>. |
|
|
1013 | |
|
|
1014 | Whenever the given C<type> is used, C<push_read> will invoke the code |
|
|
1015 | reference with the handle object, the callback and the remaining |
|
|
1016 | arguments. |
|
|
1017 | |
|
|
1018 | The code reference is supposed to return a callback (usually a closure) |
|
|
1019 | that works as a plain read callback (see C<< ->push_read ($cb) >>). |
|
|
1020 | |
|
|
1021 | It should invoke the passed callback when it is done reading (remember to |
|
|
1022 | pass C<$handle> as first argument as all other callbacks do that). |
|
|
1023 | |
|
|
1024 | Note that this is a function, and all types registered this way will be |
|
|
1025 | global, so try to use unique names. |
|
|
1026 | |
|
|
1027 | For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>, |
|
|
1028 | search for C<register_read_type>)). |
644 | |
1029 | |
645 | =item $handle->stop_read |
1030 | =item $handle->stop_read |
646 | |
1031 | |
647 | =item $handle->start_read |
1032 | =item $handle->start_read |
648 | |
1033 | |
… | |
… | |
654 | =cut |
1039 | =cut |
655 | |
1040 | |
656 | sub stop_read { |
1041 | sub stop_read { |
657 | my ($self) = @_; |
1042 | my ($self) = @_; |
658 | |
1043 | |
659 | delete $self->{rw}; |
1044 | delete $self->{_rw}; |
660 | } |
1045 | } |
661 | |
1046 | |
662 | sub start_read { |
1047 | sub start_read { |
663 | my ($self) = @_; |
1048 | my ($self) = @_; |
664 | |
1049 | |
665 | unless ($self->{rw} || $self->{eof}) { |
1050 | unless ($self->{_rw} || $self->{_eof}) { |
666 | Scalar::Util::weaken $self; |
1051 | Scalar::Util::weaken $self; |
667 | |
1052 | |
668 | $self->{rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
1053 | $self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
669 | my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf}; |
1054 | my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf}; |
670 | 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; |
671 | |
1056 | |
672 | if ($len > 0) { |
1057 | if ($len > 0) { |
|
|
1058 | $self->{_activity} = AnyEvent->now; |
|
|
1059 | |
673 | $self->{filter_r} |
1060 | $self->{filter_r} |
674 | ? $self->{filter_r}->($self, $rbuf) |
1061 | ? $self->{filter_r}->($self, $rbuf) |
675 | : $self->_drain_rbuf; |
1062 | : $self->_drain_rbuf; |
676 | |
1063 | |
677 | } elsif (defined $len) { |
1064 | } elsif (defined $len) { |
678 | delete $self->{rw}; |
1065 | delete $self->{_rw}; |
679 | $self->{eof} = 1; |
1066 | $self->{_eof} = 1; |
680 | $self->_drain_rbuf; |
1067 | $self->_drain_rbuf; |
681 | |
1068 | |
682 | } elsif ($! != EAGAIN && $! != EINTR) { |
1069 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
683 | return $self->error; |
1070 | return $self->error; |
684 | } |
1071 | } |
685 | }); |
1072 | }); |
686 | } |
1073 | } |
687 | } |
1074 | } |
688 | |
1075 | |
689 | sub _dotls { |
1076 | sub _dotls { |
690 | my ($self) = @_; |
1077 | my ($self) = @_; |
691 | |
1078 | |
692 | if (length $self->{tls_wbuf}) { |
1079 | if (length $self->{_tls_wbuf}) { |
693 | 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) { |
694 | substr $self->{tls_wbuf}, 0, $len, ""; |
1081 | substr $self->{_tls_wbuf}, 0, $len, ""; |
695 | } |
1082 | } |
696 | } |
1083 | } |
697 | |
1084 | |
698 | if (defined (my $buf = Net::SSLeay::BIO_read ($self->{tls_wbio}))) { |
1085 | if (defined (my $buf = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
699 | $self->{wbuf} .= $buf; |
1086 | $self->{wbuf} .= $buf; |
700 | $self->_drain_wbuf; |
1087 | $self->_drain_wbuf; |
701 | } |
1088 | } |
702 | |
1089 | |
703 | while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) { |
1090 | while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) { |
… | |
… | |
729 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
1116 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
730 | |
1117 | |
731 | 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 |
732 | 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. |
733 | |
1120 | |
|
|
1121 | The TLS connection object will end up in C<< $handle->{tls} >> after this |
|
|
1122 | call and can be used or changed to your liking. Note that the handshake |
|
|
1123 | might have already started when this function returns. |
|
|
1124 | |
734 | =cut |
1125 | =cut |
735 | |
1126 | |
736 | # TODO: maybe document... |
1127 | # TODO: maybe document... |
737 | sub starttls { |
1128 | sub starttls { |
738 | my ($self, $ssl, $ctx) = @_; |
1129 | my ($self, $ssl, $ctx) = @_; |
… | |
… | |
753 | # but the openssl maintainers basically said: "trust us, it just works". |
1144 | # but the openssl maintainers basically said: "trust us, it just works". |
754 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
1145 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
755 | # and mismaintained ssleay-module doesn't even offer them). |
1146 | # and mismaintained ssleay-module doesn't even offer them). |
756 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
1147 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
757 | Net::SSLeay::CTX_set_mode ($self->{tls}, |
1148 | Net::SSLeay::CTX_set_mode ($self->{tls}, |
758 | (eval { Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
1149 | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
759 | | (eval { Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
1150 | | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
760 | |
1151 | |
761 | $self->{tls_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1152 | $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
762 | $self->{tls_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1153 | $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
763 | |
1154 | |
764 | Net::SSLeay::set_bio ($ssl, $self->{tls_rbio}, $self->{tls_wbio}); |
1155 | Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio}); |
765 | |
1156 | |
766 | $self->{filter_w} = sub { |
1157 | $self->{filter_w} = sub { |
767 | $_[0]{tls_wbuf} .= ${$_[1]}; |
1158 | $_[0]{_tls_wbuf} .= ${$_[1]}; |
768 | &_dotls; |
1159 | &_dotls; |
769 | }; |
1160 | }; |
770 | $self->{filter_r} = sub { |
1161 | $self->{filter_r} = sub { |
771 | Net::SSLeay::BIO_write ($_[0]{tls_rbio}, ${$_[1]}); |
1162 | Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]}); |
772 | &_dotls; |
1163 | &_dotls; |
773 | }; |
1164 | }; |
774 | } |
1165 | } |
775 | |
1166 | |
776 | =item $handle->stoptls |
1167 | =item $handle->stoptls |
… | |
… | |
782 | |
1173 | |
783 | sub stoptls { |
1174 | sub stoptls { |
784 | my ($self) = @_; |
1175 | my ($self) = @_; |
785 | |
1176 | |
786 | Net::SSLeay::free (delete $self->{tls}) if $self->{tls}; |
1177 | Net::SSLeay::free (delete $self->{tls}) if $self->{tls}; |
|
|
1178 | |
787 | delete $self->{tls_rbio}; |
1179 | delete $self->{_rbio}; |
788 | delete $self->{tls_wbio}; |
1180 | delete $self->{_wbio}; |
789 | delete $self->{tls_wbuf}; |
1181 | delete $self->{_tls_wbuf}; |
790 | delete $self->{filter_r}; |
1182 | delete $self->{filter_r}; |
791 | delete $self->{filter_w}; |
1183 | delete $self->{filter_w}; |
792 | } |
1184 | } |
793 | |
1185 | |
794 | sub DESTROY { |
1186 | sub DESTROY { |
… | |
… | |
832 | } |
1224 | } |
833 | } |
1225 | } |
834 | |
1226 | |
835 | =back |
1227 | =back |
836 | |
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 | |
837 | =head1 AUTHOR |
1258 | =head1 AUTHOR |
838 | |
1259 | |
839 | 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>. |
840 | |
1261 | |
841 | =cut |
1262 | =cut |