1 | package AnyEvent::Handle; |
1 | package AnyEvent::Handle; |
2 | |
2 | |
3 | no warnings; |
3 | no warnings; |
4 | use strict; |
4 | use strict qw(subs vars); |
5 | |
5 | |
6 | use AnyEvent (); |
6 | use AnyEvent (); |
7 | use AnyEvent::Util qw(WSAEWOULDBLOCK); |
7 | use AnyEvent::Util qw(WSAEWOULDBLOCK); |
8 | use Scalar::Util (); |
8 | use Scalar::Util (); |
9 | use Carp (); |
9 | use Carp (); |
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14 | |
14 | |
15 | AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent |
15 | AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent |
16 | |
16 | |
17 | =cut |
17 | =cut |
18 | |
18 | |
19 | our $VERSION = 4.12; |
19 | our $VERSION = 4.3; |
20 | |
20 | |
21 | =head1 SYNOPSIS |
21 | =head1 SYNOPSIS |
22 | |
22 | |
23 | use AnyEvent; |
23 | use AnyEvent; |
24 | use AnyEvent::Handle; |
24 | use AnyEvent::Handle; |
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49 | |
49 | |
50 | This module is a helper module to make it easier to do event-based I/O on |
50 | This module is a helper module to make it easier to do event-based I/O on |
51 | filehandles. For utility functions for doing non-blocking connects and accepts |
51 | filehandles. For utility functions for doing non-blocking connects and accepts |
52 | on sockets see L<AnyEvent::Util>. |
52 | on sockets see L<AnyEvent::Util>. |
53 | |
53 | |
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54 | The L<AnyEvent::Intro> tutorial contains some well-documented |
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55 | AnyEvent::Handle examples. |
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56 | |
54 | In the following, when the documentation refers to of "bytes" then this |
57 | In the following, when the documentation refers to of "bytes" then this |
55 | means characters. As sysread and syswrite are used for all I/O, their |
58 | means characters. As sysread and syswrite are used for all I/O, their |
56 | treatment of characters applies to this module as well. |
59 | treatment of characters applies to this module as well. |
57 | |
60 | |
58 | All callbacks will be invoked with the handle object as their first |
61 | All callbacks will be invoked with the handle object as their first |
59 | argument. |
62 | argument. |
60 | |
63 | |
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64 | =head2 SIGPIPE is not handled by this module |
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65 | |
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66 | SIGPIPE is not handled by this module, so one of the practical |
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67 | requirements of using it is to ignore SIGPIPE (C<$SIG{PIPE} = |
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68 | 'IGNORE'>). At least, this is highly recommend in a networked program: If |
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69 | you use AnyEvent::Handle in a filter program (like sort), exiting on |
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70 | SIGPIPE is probably the right thing to do. |
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71 | |
61 | =head1 METHODS |
72 | =head1 METHODS |
62 | |
73 | |
63 | =over 4 |
74 | =over 4 |
64 | |
75 | |
65 | =item B<new (%args)> |
76 | =item B<new (%args)> |
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70 | |
81 | |
71 | =item fh => $filehandle [MANDATORY] |
82 | =item fh => $filehandle [MANDATORY] |
72 | |
83 | |
73 | The filehandle this L<AnyEvent::Handle> object will operate on. |
84 | The filehandle this L<AnyEvent::Handle> object will operate on. |
74 | |
85 | |
75 | NOTE: The filehandle will be set to non-blocking (using |
86 | NOTE: The filehandle will be set to non-blocking mode (using |
76 | AnyEvent::Util::fh_nonblocking). |
87 | C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in |
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88 | that mode. |
77 | |
89 | |
78 | =item on_eof => $cb->($handle) |
90 | =item on_eof => $cb->($handle) |
79 | |
91 | |
80 | Set the callback to be called when an end-of-file condition is detcted, |
92 | Set the callback to be called when an end-of-file condition is detected, |
81 | i.e. in the case of a socket, when the other side has closed the |
93 | i.e. in the case of a socket, when the other side has closed the |
82 | connection cleanly. |
94 | connection cleanly. |
83 | |
95 | |
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96 | For sockets, this just means that the other side has stopped sending data, |
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97 | you can still try to write data, and, in fact, one can return from the eof |
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98 | callback and continue writing data, as only the read part has been shut |
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99 | down. |
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100 | |
84 | While not mandatory, it is highly recommended to set an eof callback, |
101 | While not mandatory, it is I<highly> recommended to set an eof callback, |
85 | otherwise you might end up with a closed socket while you are still |
102 | otherwise you might end up with a closed socket while you are still |
86 | waiting for data. |
103 | waiting for data. |
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104 | |
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105 | If an EOF condition has been detected but no C<on_eof> callback has been |
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106 | set, then a fatal error will be raised with C<$!> set to <0>. |
87 | |
107 | |
88 | =item on_error => $cb->($handle, $fatal) |
108 | =item on_error => $cb->($handle, $fatal) |
89 | |
109 | |
90 | This is the error callback, which is called when, well, some error |
110 | This is the error callback, which is called when, well, some error |
91 | occured, such as not being able to resolve the hostname, failure to |
111 | occured, such as not being able to resolve the hostname, failure to |
92 | connect or a read error. |
112 | connect or a read error. |
93 | |
113 | |
94 | Some errors are fatal (which is indicated by C<$fatal> being true). On |
114 | Some errors are fatal (which is indicated by C<$fatal> being true). On |
95 | fatal errors the handle object will be shut down and will not be |
115 | fatal errors the handle object will be shut down and will not be usable |
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116 | (but you are free to look at the current C<< ->rbuf >>). Examples of fatal |
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117 | errors are an EOF condition with active (but unsatisifable) read watchers |
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118 | (C<EPIPE>) or I/O errors. |
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119 | |
96 | usable. Non-fatal errors can be retried by simply returning, but it is |
120 | Non-fatal errors can be retried by simply returning, but it is recommended |
97 | recommended to simply ignore this parameter and instead abondon the handle |
121 | to simply ignore this parameter and instead abondon the handle object |
98 | object when this callback is invoked. |
122 | when this callback is invoked. Examples of non-fatal errors are timeouts |
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123 | C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>). |
99 | |
124 | |
100 | On callback entrance, the value of C<$!> contains the operating system |
125 | On callback entrance, the value of C<$!> contains the operating system |
101 | error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>). |
126 | error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>). |
102 | |
127 | |
103 | While not mandatory, it is I<highly> recommended to set this callback, as |
128 | While not mandatory, it is I<highly> recommended to set this callback, as |
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105 | C<croak>. |
130 | C<croak>. |
106 | |
131 | |
107 | =item on_read => $cb->($handle) |
132 | =item on_read => $cb->($handle) |
108 | |
133 | |
109 | This sets the default read callback, which is called when data arrives |
134 | This sets the default read callback, which is called when data arrives |
110 | and no read request is in the queue. |
135 | and no read request is in the queue (unlike read queue callbacks, this |
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136 | callback will only be called when at least one octet of data is in the |
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137 | read buffer). |
111 | |
138 | |
112 | To access (and remove data from) the read buffer, use the C<< ->rbuf >> |
139 | To access (and remove data from) the read buffer, use the C<< ->rbuf >> |
113 | method or access the C<$handle->{rbuf}> member directly. |
140 | method or access the C<$handle->{rbuf}> member directly. |
114 | |
141 | |
115 | When an EOF condition is detected then AnyEvent::Handle will first try to |
142 | When an EOF condition is detected then AnyEvent::Handle will first try to |
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122 | This sets the callback that is called when the write buffer becomes empty |
149 | This sets the callback that is called when the write buffer becomes empty |
123 | (or when the callback is set and the buffer is empty already). |
150 | (or when the callback is set and the buffer is empty already). |
124 | |
151 | |
125 | To append to the write buffer, use the C<< ->push_write >> method. |
152 | To append to the write buffer, use the C<< ->push_write >> method. |
126 | |
153 | |
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154 | This callback is useful when you don't want to put all of your write data |
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155 | into the queue at once, for example, when you want to write the contents |
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156 | of some file to the socket you might not want to read the whole file into |
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157 | memory and push it into the queue, but instead only read more data from |
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158 | the file when the write queue becomes empty. |
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159 | |
127 | =item timeout => $fractional_seconds |
160 | =item timeout => $fractional_seconds |
128 | |
161 | |
129 | If non-zero, then this enables an "inactivity" timeout: whenever this many |
162 | If non-zero, then this enables an "inactivity" timeout: whenever this many |
130 | seconds pass without a successful read or write on the underlying file |
163 | seconds pass without a successful read or write on the underlying file |
131 | handle, the C<on_timeout> callback will be invoked (and if that one is |
164 | handle, the C<on_timeout> callback will be invoked (and if that one is |
132 | missing, an C<ETIMEDOUT> error will be raised). |
165 | missing, a non-fatal C<ETIMEDOUT> error will be raised). |
133 | |
166 | |
134 | Note that timeout processing is also active when you currently do not have |
167 | Note that timeout processing is also active when you currently do not have |
135 | any outstanding read or write requests: If you plan to keep the connection |
168 | any outstanding read or write requests: If you plan to keep the connection |
136 | idle then you should disable the timout temporarily or ignore the timeout |
169 | idle then you should disable the timout temporarily or ignore the timeout |
137 | in the C<on_timeout> callback. |
170 | in the C<on_timeout> callback, in which case AnyEvent::Handle will simply |
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171 | restart the timeout. |
138 | |
172 | |
139 | Zero (the default) disables this timeout. |
173 | Zero (the default) disables this timeout. |
140 | |
174 | |
141 | =item on_timeout => $cb->($handle) |
175 | =item on_timeout => $cb->($handle) |
142 | |
176 | |
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146 | |
180 | |
147 | =item rbuf_max => <bytes> |
181 | =item rbuf_max => <bytes> |
148 | |
182 | |
149 | If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
183 | If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
150 | when the read buffer ever (strictly) exceeds this size. This is useful to |
184 | when the read buffer ever (strictly) exceeds this size. This is useful to |
151 | avoid denial-of-service attacks. |
185 | avoid some forms of denial-of-service attacks. |
152 | |
186 | |
153 | For example, a server accepting connections from untrusted sources should |
187 | For example, a server accepting connections from untrusted sources should |
154 | be configured to accept only so-and-so much data that it cannot act on |
188 | be configured to accept only so-and-so much data that it cannot act on |
155 | (for example, when expecting a line, an attacker could send an unlimited |
189 | (for example, when expecting a line, an attacker could send an unlimited |
156 | amount of data without a callback ever being called as long as the line |
190 | amount of data without a callback ever being called as long as the line |
157 | isn't finished). |
191 | isn't finished). |
158 | |
192 | |
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193 | =item autocork => <boolean> |
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194 | |
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195 | When disabled (the default), then C<push_write> will try to immediately |
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196 | write the data to the handle, if possible. This avoids having to register |
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197 | a write watcher and wait for the next event loop iteration, but can |
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198 | be inefficient if you write multiple small chunks (on the wire, this |
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199 | disadvantage is usually avoided by your kernel's nagle algorithm, see |
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200 | C<no_delay>, but this option can save costly syscalls). |
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201 | |
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202 | When enabled, then writes will always be queued till the next event loop |
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203 | iteration. This is efficient when you do many small writes per iteration, |
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204 | but less efficient when you do a single write only per iteration (or when |
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205 | the write buffer often is full). It also increases write latency. |
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206 | |
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207 | =item no_delay => <boolean> |
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208 | |
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209 | When doing small writes on sockets, your operating system kernel might |
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210 | wait a bit for more data before actually sending it out. This is called |
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211 | the Nagle algorithm, and usually it is beneficial. |
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212 | |
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213 | In some situations you want as low a delay as possible, which can be |
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214 | accomplishd by setting this option to a true value. |
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215 | |
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216 | The default is your opertaing system's default behaviour (most likely |
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217 | enabled), this option explicitly enables or disables it, if possible. |
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218 | |
159 | =item read_size => <bytes> |
219 | =item read_size => <bytes> |
160 | |
220 | |
161 | The default read block size (the amount of bytes this module will try to read |
221 | The default read block size (the amount of bytes this module will |
162 | during each (loop iteration). Default: C<8192>. |
222 | try to read during each loop iteration, which affects memory |
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223 | requirements). Default: C<8192>. |
163 | |
224 | |
164 | =item low_water_mark => <bytes> |
225 | =item low_water_mark => <bytes> |
165 | |
226 | |
166 | Sets the amount of bytes (default: C<0>) that make up an "empty" write |
227 | Sets the amount of bytes (default: C<0>) that make up an "empty" write |
167 | buffer: If the write reaches this size or gets even samller it is |
228 | buffer: If the write reaches this size or gets even samller it is |
168 | considered empty. |
229 | considered empty. |
169 | |
230 | |
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231 | Sometimes it can be beneficial (for performance reasons) to add data to |
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232 | the write buffer before it is fully drained, but this is a rare case, as |
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233 | the operating system kernel usually buffers data as well, so the default |
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234 | is good in almost all cases. |
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235 | |
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236 | =item linger => <seconds> |
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237 | |
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238 | If non-zero (default: C<3600>), then the destructor of the |
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239 | AnyEvent::Handle object will check whether there is still outstanding |
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240 | write data and will install a watcher that will write this data to the |
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241 | socket. No errors will be reported (this mostly matches how the operating |
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242 | system treats outstanding data at socket close time). |
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243 | |
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244 | This will not work for partial TLS data that could not be encoded |
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245 | yet. This data will be lost. Calling the C<stoptls> method in time might |
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246 | help. |
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247 | |
170 | =item tls => "accept" | "connect" | Net::SSLeay::SSL object |
248 | =item tls => "accept" | "connect" | Net::SSLeay::SSL object |
171 | |
249 | |
172 | When this parameter is given, it enables TLS (SSL) mode, that means it |
250 | When this parameter is given, it enables TLS (SSL) mode, that means |
173 | will start making tls handshake and will transparently encrypt/decrypt |
251 | AnyEvent will start a TLS handshake as soon as the conenction has been |
174 | data. |
252 | established and will transparently encrypt/decrypt data afterwards. |
175 | |
253 | |
176 | TLS mode requires Net::SSLeay to be installed (it will be loaded |
254 | TLS mode requires Net::SSLeay to be installed (it will be loaded |
177 | automatically when you try to create a TLS handle). |
255 | automatically when you try to create a TLS handle): this module doesn't |
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256 | have a dependency on that module, so if your module requires it, you have |
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257 | to add the dependency yourself. |
178 | |
258 | |
179 | For the TLS server side, use C<accept>, and for the TLS client side of a |
259 | Unlike TCP, TLS has a server and client side: for the TLS server side, use |
180 | connection, use C<connect> mode. |
260 | C<accept>, and for the TLS client side of a connection, use C<connect> |
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261 | mode. |
181 | |
262 | |
182 | You can also provide your own TLS connection object, but you have |
263 | You can also provide your own TLS connection object, but you have |
183 | to make sure that you call either C<Net::SSLeay::set_connect_state> |
264 | to make sure that you call either C<Net::SSLeay::set_connect_state> |
184 | or C<Net::SSLeay::set_accept_state> on it before you pass it to |
265 | or C<Net::SSLeay::set_accept_state> on it before you pass it to |
185 | AnyEvent::Handle. |
266 | AnyEvent::Handle. |
186 | |
267 | |
187 | See the C<starttls> method if you need to start TLs negotiation later. |
268 | See the C<< ->starttls >> method for when need to start TLS negotiation later. |
188 | |
269 | |
189 | =item tls_ctx => $ssl_ctx |
270 | =item tls_ctx => $ssl_ctx |
190 | |
271 | |
191 | Use the given Net::SSLeay::CTX object to create the new TLS connection |
272 | Use the given C<Net::SSLeay::CTX> object to create the new TLS connection |
192 | (unless a connection object was specified directly). If this parameter is |
273 | (unless a connection object was specified directly). If this parameter is |
193 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
274 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
194 | |
275 | |
195 | =item json => JSON or JSON::XS object |
276 | =item json => JSON or JSON::XS object |
196 | |
277 | |
197 | This is the json coder object used by the C<json> read and write types. |
278 | This is the json coder object used by the C<json> read and write types. |
198 | |
279 | |
199 | If you don't supply it, then AnyEvent::Handle will create and use a |
280 | If you don't supply it, then AnyEvent::Handle will create and use a |
200 | suitable one, which will write and expect UTF-8 encoded JSON texts. |
281 | suitable one (on demand), which will write and expect UTF-8 encoded JSON |
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282 | texts. |
201 | |
283 | |
202 | Note that you are responsible to depend on the JSON module if you want to |
284 | Note that you are responsible to depend on the JSON module if you want to |
203 | use this functionality, as AnyEvent does not have a dependency itself. |
285 | use this functionality, as AnyEvent does not have a dependency itself. |
204 | |
286 | |
205 | =item filter_r => $cb |
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206 | |
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207 | =item filter_w => $cb |
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208 | |
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209 | These exist, but are undocumented at this time. |
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210 | |
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211 | =back |
287 | =back |
212 | |
288 | |
213 | =cut |
289 | =cut |
214 | |
290 | |
215 | sub new { |
291 | sub new { |
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219 | |
295 | |
220 | $self->{fh} or Carp::croak "mandatory argument fh is missing"; |
296 | $self->{fh} or Carp::croak "mandatory argument fh is missing"; |
221 | |
297 | |
222 | AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
298 | AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
223 | |
299 | |
224 | if ($self->{tls}) { |
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225 | require Net::SSLeay; |
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226 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}); |
300 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}) |
227 | } |
301 | if $self->{tls}; |
228 | |
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229 | # $self->on_eof (delete $self->{on_eof} ) if $self->{on_eof}; # nop |
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230 | # $self->on_error (delete $self->{on_error}) if $self->{on_error}; # nop |
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231 | # $self->on_read (delete $self->{on_read} ) if $self->{on_read}; # nop |
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232 | $self->on_drain (delete $self->{on_drain}) if $self->{on_drain}; |
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233 | |
302 | |
234 | $self->{_activity} = AnyEvent->now; |
303 | $self->{_activity} = AnyEvent->now; |
235 | $self->_timeout; |
304 | $self->_timeout; |
236 | |
305 | |
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306 | $self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain}; |
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307 | $self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay}; |
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308 | |
237 | $self->start_read; |
309 | $self->start_read |
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310 | if $self->{on_read}; |
238 | |
311 | |
239 | $self |
312 | $self |
240 | } |
313 | } |
241 | |
314 | |
242 | sub _shutdown { |
315 | sub _shutdown { |
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245 | delete $self->{_tw}; |
318 | delete $self->{_tw}; |
246 | delete $self->{_rw}; |
319 | delete $self->{_rw}; |
247 | delete $self->{_ww}; |
320 | delete $self->{_ww}; |
248 | delete $self->{fh}; |
321 | delete $self->{fh}; |
249 | |
322 | |
250 | $self->stoptls; |
323 | &_freetls; |
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324 | |
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325 | delete $self->{on_read}; |
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326 | delete $self->{_queue}; |
251 | } |
327 | } |
252 | |
328 | |
253 | sub _error { |
329 | sub _error { |
254 | my ($self, $errno, $fatal) = @_; |
330 | my ($self, $errno, $fatal) = @_; |
255 | |
331 | |
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265 | } |
341 | } |
266 | } |
342 | } |
267 | |
343 | |
268 | =item $fh = $handle->fh |
344 | =item $fh = $handle->fh |
269 | |
345 | |
270 | This method returns the file handle of the L<AnyEvent::Handle> object. |
346 | This method returns the file handle used to create the L<AnyEvent::Handle> object. |
271 | |
347 | |
272 | =cut |
348 | =cut |
273 | |
349 | |
274 | sub fh { $_[0]{fh} } |
350 | sub fh { $_[0]{fh} } |
275 | |
351 | |
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293 | $_[0]{on_eof} = $_[1]; |
369 | $_[0]{on_eof} = $_[1]; |
294 | } |
370 | } |
295 | |
371 | |
296 | =item $handle->on_timeout ($cb) |
372 | =item $handle->on_timeout ($cb) |
297 | |
373 | |
298 | Replace the current C<on_timeout> callback, or disables the callback |
374 | Replace the current C<on_timeout> callback, or disables the callback (but |
299 | (but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor |
375 | not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor |
300 | argument. |
376 | argument and method. |
301 | |
377 | |
302 | =cut |
378 | =cut |
303 | |
379 | |
304 | sub on_timeout { |
380 | sub on_timeout { |
305 | $_[0]{on_timeout} = $_[1]; |
381 | $_[0]{on_timeout} = $_[1]; |
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382 | } |
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383 | |
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384 | =item $handle->autocork ($boolean) |
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385 | |
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386 | Enables or disables the current autocork behaviour (see C<autocork> |
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387 | constructor argument). |
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388 | |
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389 | =cut |
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390 | |
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391 | =item $handle->no_delay ($boolean) |
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392 | |
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393 | Enables or disables the C<no_delay> setting (see constructor argument of |
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394 | the same name for details). |
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395 | |
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396 | =cut |
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397 | |
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398 | sub no_delay { |
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399 | $_[0]{no_delay} = $_[1]; |
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400 | |
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401 | eval { |
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402 | local $SIG{__DIE__}; |
|
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403 | setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1]; |
|
|
404 | }; |
306 | } |
405 | } |
307 | |
406 | |
308 | ############################################################################# |
407 | ############################################################################# |
309 | |
408 | |
310 | =item $handle->timeout ($seconds) |
409 | =item $handle->timeout ($seconds) |
… | |
… | |
339 | $self->{on_timeout}($self); |
438 | $self->{on_timeout}($self); |
340 | } else { |
439 | } else { |
341 | $self->_error (&Errno::ETIMEDOUT); |
440 | $self->_error (&Errno::ETIMEDOUT); |
342 | } |
441 | } |
343 | |
442 | |
344 | # callbakx could have changed timeout value, optimise |
443 | # callback could have changed timeout value, optimise |
345 | return unless $self->{timeout}; |
444 | return unless $self->{timeout}; |
346 | |
445 | |
347 | # calculate new after |
446 | # calculate new after |
348 | $after = $self->{timeout}; |
447 | $after = $self->{timeout}; |
349 | } |
448 | } |
350 | |
449 | |
351 | Scalar::Util::weaken $self; |
450 | Scalar::Util::weaken $self; |
|
|
451 | return unless $self; # ->error could have destroyed $self |
352 | |
452 | |
353 | $self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub { |
453 | $self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub { |
354 | delete $self->{_tw}; |
454 | delete $self->{_tw}; |
355 | $self->_timeout; |
455 | $self->_timeout; |
356 | }); |
456 | }); |
… | |
… | |
387 | my ($self, $cb) = @_; |
487 | my ($self, $cb) = @_; |
388 | |
488 | |
389 | $self->{on_drain} = $cb; |
489 | $self->{on_drain} = $cb; |
390 | |
490 | |
391 | $cb->($self) |
491 | $cb->($self) |
392 | if $cb && $self->{low_water_mark} >= length $self->{wbuf}; |
492 | if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf}); |
393 | } |
493 | } |
394 | |
494 | |
395 | =item $handle->push_write ($data) |
495 | =item $handle->push_write ($data) |
396 | |
496 | |
397 | Queues the given scalar to be written. You can push as much data as you |
497 | Queues the given scalar to be written. You can push as much data as you |
… | |
… | |
414 | substr $self->{wbuf}, 0, $len, ""; |
514 | substr $self->{wbuf}, 0, $len, ""; |
415 | |
515 | |
416 | $self->{_activity} = AnyEvent->now; |
516 | $self->{_activity} = AnyEvent->now; |
417 | |
517 | |
418 | $self->{on_drain}($self) |
518 | $self->{on_drain}($self) |
419 | if $self->{low_water_mark} >= length $self->{wbuf} |
519 | if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf}) |
420 | && $self->{on_drain}; |
520 | && $self->{on_drain}; |
421 | |
521 | |
422 | delete $self->{_ww} unless length $self->{wbuf}; |
522 | delete $self->{_ww} unless length $self->{wbuf}; |
423 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
523 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
424 | $self->_error ($!, 1); |
524 | $self->_error ($!, 1); |
425 | } |
525 | } |
426 | }; |
526 | }; |
427 | |
527 | |
428 | # try to write data immediately |
528 | # try to write data immediately |
429 | $cb->(); |
529 | $cb->() unless $self->{autocork}; |
430 | |
530 | |
431 | # if still data left in wbuf, we need to poll |
531 | # if still data left in wbuf, we need to poll |
432 | $self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb) |
532 | $self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb) |
433 | if length $self->{wbuf}; |
533 | if length $self->{wbuf}; |
434 | }; |
534 | }; |
… | |
… | |
448 | |
548 | |
449 | @_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write") |
549 | @_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write") |
450 | ->($self, @_); |
550 | ->($self, @_); |
451 | } |
551 | } |
452 | |
552 | |
453 | if ($self->{filter_w}) { |
553 | if ($self->{tls}) { |
454 | $self->{filter_w}($self, \$_[0]); |
554 | $self->{_tls_wbuf} .= $_[0]; |
|
|
555 | &_dotls ($self); |
455 | } else { |
556 | } else { |
456 | $self->{wbuf} .= $_[0]; |
557 | $self->{wbuf} .= $_[0]; |
457 | $self->_drain_wbuf; |
558 | $self->_drain_wbuf; |
458 | } |
559 | } |
459 | } |
560 | } |
… | |
… | |
476 | =cut |
577 | =cut |
477 | |
578 | |
478 | register_write_type netstring => sub { |
579 | register_write_type netstring => sub { |
479 | my ($self, $string) = @_; |
580 | my ($self, $string) = @_; |
480 | |
581 | |
481 | sprintf "%d:%s,", (length $string), $string |
582 | (length $string) . ":$string," |
|
|
583 | }; |
|
|
584 | |
|
|
585 | =item packstring => $format, $data |
|
|
586 | |
|
|
587 | An octet string prefixed with an encoded length. The encoding C<$format> |
|
|
588 | uses the same format as a Perl C<pack> format, but must specify a single |
|
|
589 | integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an |
|
|
590 | optional C<!>, C<< < >> or C<< > >> modifier). |
|
|
591 | |
|
|
592 | =cut |
|
|
593 | |
|
|
594 | register_write_type packstring => sub { |
|
|
595 | my ($self, $format, $string) = @_; |
|
|
596 | |
|
|
597 | pack "$format/a*", $string |
482 | }; |
598 | }; |
483 | |
599 | |
484 | =item json => $array_or_hashref |
600 | =item json => $array_or_hashref |
485 | |
601 | |
486 | Encodes the given hash or array reference into a JSON object. Unless you |
602 | Encodes the given hash or array reference into a JSON object. Unless you |
… | |
… | |
520 | |
636 | |
521 | $self->{json} ? $self->{json}->encode ($ref) |
637 | $self->{json} ? $self->{json}->encode ($ref) |
522 | : JSON::encode_json ($ref) |
638 | : JSON::encode_json ($ref) |
523 | }; |
639 | }; |
524 | |
640 | |
|
|
641 | =item storable => $reference |
|
|
642 | |
|
|
643 | Freezes the given reference using L<Storable> and writes it to the |
|
|
644 | handle. Uses the C<nfreeze> format. |
|
|
645 | |
|
|
646 | =cut |
|
|
647 | |
|
|
648 | register_write_type storable => sub { |
|
|
649 | my ($self, $ref) = @_; |
|
|
650 | |
|
|
651 | require Storable; |
|
|
652 | |
|
|
653 | pack "w/a*", Storable::nfreeze ($ref) |
|
|
654 | }; |
|
|
655 | |
525 | =back |
656 | =back |
526 | |
657 | |
527 | =item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args) |
658 | =item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args) |
528 | |
659 | |
529 | This function (not method) lets you add your own types to C<push_write>. |
660 | This function (not method) lets you add your own types to C<push_write>. |
… | |
… | |
551 | ways, the "simple" way, using only C<on_read> and the "complex" way, using |
682 | ways, the "simple" way, using only C<on_read> and the "complex" way, using |
552 | a queue. |
683 | a queue. |
553 | |
684 | |
554 | In the simple case, you just install an C<on_read> callback and whenever |
685 | In the simple case, you just install an C<on_read> callback and whenever |
555 | new data arrives, it will be called. You can then remove some data (if |
686 | new data arrives, it will be called. You can then remove some data (if |
556 | enough is there) from the read buffer (C<< $handle->rbuf >>) if you want |
687 | enough is there) from the read buffer (C<< $handle->rbuf >>). Or you cna |
557 | or not. |
688 | leave the data there if you want to accumulate more (e.g. when only a |
|
|
689 | partial message has been received so far). |
558 | |
690 | |
559 | In the more complex case, you want to queue multiple callbacks. In this |
691 | In the more complex case, you want to queue multiple callbacks. In this |
560 | case, AnyEvent::Handle will call the first queued callback each time new |
692 | case, AnyEvent::Handle will call the first queued callback each time new |
561 | data arrives and removes it when it has done its job (see C<push_read>, |
693 | data arrives (also the first time it is queued) and removes it when it has |
562 | below). |
694 | done its job (see C<push_read>, below). |
563 | |
695 | |
564 | This way you can, for example, push three line-reads, followed by reading |
696 | This way you can, for example, push three line-reads, followed by reading |
565 | a chunk of data, and AnyEvent::Handle will execute them in order. |
697 | a chunk of data, and AnyEvent::Handle will execute them in order. |
566 | |
698 | |
567 | Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by |
699 | Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by |
… | |
… | |
580 | # handle xml |
712 | # handle xml |
581 | }); |
713 | }); |
582 | }); |
714 | }); |
583 | }); |
715 | }); |
584 | |
716 | |
585 | Example 2: Implement a client for a protocol that replies either with |
717 | Example 2: Implement a client for a protocol that replies either with "OK" |
586 | "OK" and another line or "ERROR" for one request, and 64 bytes for the |
718 | and another line or "ERROR" for the first request that is sent, and 64 |
587 | second request. Due tot he availability of a full queue, we can just |
719 | bytes for the second request. Due to the availability of a queue, we can |
588 | pipeline sending both requests and manipulate the queue as necessary in |
720 | just pipeline sending both requests and manipulate the queue as necessary |
589 | the callbacks: |
721 | in the callbacks. |
590 | |
722 | |
591 | # request one |
723 | When the first callback is called and sees an "OK" response, it will |
|
|
724 | C<unshift> another line-read. This line-read will be queued I<before> the |
|
|
725 | 64-byte chunk callback. |
|
|
726 | |
|
|
727 | # request one, returns either "OK + extra line" or "ERROR" |
592 | $handle->push_write ("request 1\015\012"); |
728 | $handle->push_write ("request 1\015\012"); |
593 | |
729 | |
594 | # we expect "ERROR" or "OK" as response, so push a line read |
730 | # we expect "ERROR" or "OK" as response, so push a line read |
595 | $handle->push_read (line => sub { |
731 | $handle->push_read (line => sub { |
596 | # if we got an "OK", we have to _prepend_ another line, |
732 | # if we got an "OK", we have to _prepend_ another line, |
… | |
… | |
603 | ... |
739 | ... |
604 | }); |
740 | }); |
605 | } |
741 | } |
606 | }); |
742 | }); |
607 | |
743 | |
608 | # request two |
744 | # request two, simply returns 64 octets |
609 | $handle->push_write ("request 2\015\012"); |
745 | $handle->push_write ("request 2\015\012"); |
610 | |
746 | |
611 | # simply read 64 bytes, always |
747 | # simply read 64 bytes, always |
612 | $handle->push_read (chunk => 64, sub { |
748 | $handle->push_read (chunk => 64, sub { |
613 | my $response = $_[1]; |
749 | my $response = $_[1]; |
… | |
… | |
619 | =cut |
755 | =cut |
620 | |
756 | |
621 | sub _drain_rbuf { |
757 | sub _drain_rbuf { |
622 | my ($self) = @_; |
758 | my ($self) = @_; |
623 | |
759 | |
|
|
760 | local $self->{_in_drain} = 1; |
|
|
761 | |
624 | if ( |
762 | if ( |
625 | defined $self->{rbuf_max} |
763 | defined $self->{rbuf_max} |
626 | && $self->{rbuf_max} < length $self->{rbuf} |
764 | && $self->{rbuf_max} < length $self->{rbuf} |
627 | ) { |
765 | ) { |
628 | return $self->_error (&Errno::ENOSPC, 1); |
766 | $self->_error (&Errno::ENOSPC, 1), return; |
629 | } |
767 | } |
630 | |
768 | |
631 | return if $self->{in_drain}; |
769 | while () { |
632 | local $self->{in_drain} = 1; |
|
|
633 | |
|
|
634 | while (my $len = length $self->{rbuf}) { |
770 | my $len = length $self->{rbuf}; |
635 | no strict 'refs'; |
771 | |
636 | if (my $cb = shift @{ $self->{_queue} }) { |
772 | if (my $cb = shift @{ $self->{_queue} }) { |
637 | unless ($cb->($self)) { |
773 | unless ($cb->($self)) { |
638 | if ($self->{_eof}) { |
774 | if ($self->{_eof}) { |
639 | # no progress can be made (not enough data and no data forthcoming) |
775 | # no progress can be made (not enough data and no data forthcoming) |
640 | return $self->_error (&Errno::EPIPE, 1); |
776 | $self->_error (&Errno::EPIPE, 1), return; |
641 | } |
777 | } |
642 | |
778 | |
643 | unshift @{ $self->{_queue} }, $cb; |
779 | unshift @{ $self->{_queue} }, $cb; |
644 | return; |
780 | last; |
645 | } |
781 | } |
646 | } elsif ($self->{on_read}) { |
782 | } elsif ($self->{on_read}) { |
|
|
783 | last unless $len; |
|
|
784 | |
647 | $self->{on_read}($self); |
785 | $self->{on_read}($self); |
648 | |
786 | |
649 | if ( |
787 | if ( |
650 | $self->{_eof} # if no further data will arrive |
|
|
651 | && $len == length $self->{rbuf} # and no data has been consumed |
788 | $len == length $self->{rbuf} # if no data has been consumed |
652 | && !@{ $self->{_queue} } # and the queue is still empty |
789 | && !@{ $self->{_queue} } # and the queue is still empty |
653 | && $self->{on_read} # and we still want to read data |
790 | && $self->{on_read} # but we still have on_read |
654 | ) { |
791 | ) { |
|
|
792 | # no further data will arrive |
655 | # then no progress can be made |
793 | # so no progress can be made |
656 | return $self->_error (&Errno::EPIPE, 1); |
794 | $self->_error (&Errno::EPIPE, 1), return |
|
|
795 | if $self->{_eof}; |
|
|
796 | |
|
|
797 | last; # more data might arrive |
657 | } |
798 | } |
658 | } else { |
799 | } else { |
659 | # read side becomes idle |
800 | # read side becomes idle |
660 | delete $self->{_rw}; |
801 | delete $self->{_rw} unless $self->{tls}; |
661 | return; |
802 | last; |
662 | } |
803 | } |
663 | } |
804 | } |
664 | |
805 | |
|
|
806 | if ($self->{_eof}) { |
|
|
807 | if ($self->{on_eof}) { |
665 | $self->{on_eof}($self) |
808 | $self->{on_eof}($self) |
666 | if $self->{_eof} && $self->{on_eof}; |
809 | } else { |
|
|
810 | $self->_error (0, 1); |
|
|
811 | } |
|
|
812 | } |
|
|
813 | |
|
|
814 | # may need to restart read watcher |
|
|
815 | unless ($self->{_rw}) { |
|
|
816 | $self->start_read |
|
|
817 | if $self->{on_read} || @{ $self->{_queue} }; |
|
|
818 | } |
667 | } |
819 | } |
668 | |
820 | |
669 | =item $handle->on_read ($cb) |
821 | =item $handle->on_read ($cb) |
670 | |
822 | |
671 | This replaces the currently set C<on_read> callback, or clears it (when |
823 | This replaces the currently set C<on_read> callback, or clears it (when |
… | |
… | |
676 | |
828 | |
677 | sub on_read { |
829 | sub on_read { |
678 | my ($self, $cb) = @_; |
830 | my ($self, $cb) = @_; |
679 | |
831 | |
680 | $self->{on_read} = $cb; |
832 | $self->{on_read} = $cb; |
|
|
833 | $self->_drain_rbuf if $cb && !$self->{_in_drain}; |
681 | } |
834 | } |
682 | |
835 | |
683 | =item $handle->rbuf |
836 | =item $handle->rbuf |
684 | |
837 | |
685 | Returns the read buffer (as a modifiable lvalue). |
838 | Returns the read buffer (as a modifiable lvalue). |
… | |
… | |
734 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read") |
887 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read") |
735 | ->($self, $cb, @_); |
888 | ->($self, $cb, @_); |
736 | } |
889 | } |
737 | |
890 | |
738 | push @{ $self->{_queue} }, $cb; |
891 | push @{ $self->{_queue} }, $cb; |
739 | $self->_drain_rbuf; |
892 | $self->_drain_rbuf unless $self->{_in_drain}; |
740 | } |
893 | } |
741 | |
894 | |
742 | sub unshift_read { |
895 | sub unshift_read { |
743 | my $self = shift; |
896 | my $self = shift; |
744 | my $cb = pop; |
897 | my $cb = pop; |
… | |
… | |
750 | ->($self, $cb, @_); |
903 | ->($self, $cb, @_); |
751 | } |
904 | } |
752 | |
905 | |
753 | |
906 | |
754 | unshift @{ $self->{_queue} }, $cb; |
907 | unshift @{ $self->{_queue} }, $cb; |
755 | $self->_drain_rbuf; |
908 | $self->_drain_rbuf unless $self->{_in_drain}; |
756 | } |
909 | } |
757 | |
910 | |
758 | =item $handle->push_read (type => @args, $cb) |
911 | =item $handle->push_read (type => @args, $cb) |
759 | |
912 | |
760 | =item $handle->unshift_read (type => @args, $cb) |
913 | =item $handle->unshift_read (type => @args, $cb) |
… | |
… | |
790 | $cb->($_[0], substr $_[0]{rbuf}, 0, $len, ""); |
943 | $cb->($_[0], substr $_[0]{rbuf}, 0, $len, ""); |
791 | 1 |
944 | 1 |
792 | } |
945 | } |
793 | }; |
946 | }; |
794 | |
947 | |
795 | # compatibility with older API |
|
|
796 | sub push_read_chunk { |
|
|
797 | $_[0]->push_read (chunk => $_[1], $_[2]); |
|
|
798 | } |
|
|
799 | |
|
|
800 | sub unshift_read_chunk { |
|
|
801 | $_[0]->unshift_read (chunk => $_[1], $_[2]); |
|
|
802 | } |
|
|
803 | |
|
|
804 | =item line => [$eol, ]$cb->($handle, $line, $eol) |
948 | =item line => [$eol, ]$cb->($handle, $line, $eol) |
805 | |
949 | |
806 | The callback will be called only once a full line (including the end of |
950 | The callback will be called only once a full line (including the end of |
807 | line marker, C<$eol>) has been read. This line (excluding the end of line |
951 | line marker, C<$eol>) has been read. This line (excluding the end of line |
808 | marker) will be passed to the callback as second argument (C<$line>), and |
952 | marker) will be passed to the callback as second argument (C<$line>), and |
… | |
… | |
823 | =cut |
967 | =cut |
824 | |
968 | |
825 | register_read_type line => sub { |
969 | register_read_type line => sub { |
826 | my ($self, $cb, $eol) = @_; |
970 | my ($self, $cb, $eol) = @_; |
827 | |
971 | |
828 | $eol = qr|(\015?\012)| if @_ < 3; |
972 | if (@_ < 3) { |
829 | $eol = quotemeta $eol unless ref $eol; |
973 | # this is more than twice as fast as the generic code below |
830 | $eol = qr|^(.*?)($eol)|s; |
|
|
831 | |
|
|
832 | sub { |
974 | sub { |
833 | $_[0]{rbuf} =~ s/$eol// or return; |
975 | $_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return; |
834 | |
976 | |
835 | $cb->($_[0], $1, $2); |
977 | $cb->($_[0], $1, $2); |
836 | 1 |
|
|
837 | } |
|
|
838 | }; |
|
|
839 | |
|
|
840 | # compatibility with older API |
|
|
841 | sub push_read_line { |
|
|
842 | my $self = shift; |
|
|
843 | $self->push_read (line => @_); |
|
|
844 | } |
|
|
845 | |
|
|
846 | sub unshift_read_line { |
|
|
847 | my $self = shift; |
|
|
848 | $self->unshift_read (line => @_); |
|
|
849 | } |
|
|
850 | |
|
|
851 | =item netstring => $cb->($handle, $string) |
|
|
852 | |
|
|
853 | A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement). |
|
|
854 | |
|
|
855 | Throws an error with C<$!> set to EBADMSG on format violations. |
|
|
856 | |
|
|
857 | =cut |
|
|
858 | |
|
|
859 | register_read_type netstring => sub { |
|
|
860 | my ($self, $cb) = @_; |
|
|
861 | |
|
|
862 | sub { |
|
|
863 | unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) { |
|
|
864 | if ($_[0]{rbuf} =~ /[^0-9]/) { |
|
|
865 | $self->_error (&Errno::EBADMSG); |
|
|
866 | } |
978 | 1 |
867 | return; |
|
|
868 | } |
979 | } |
|
|
980 | } else { |
|
|
981 | $eol = quotemeta $eol unless ref $eol; |
|
|
982 | $eol = qr|^(.*?)($eol)|s; |
869 | |
983 | |
870 | my $len = $1; |
984 | sub { |
|
|
985 | $_[0]{rbuf} =~ s/$eol// or return; |
871 | |
986 | |
872 | $self->unshift_read (chunk => $len, sub { |
987 | $cb->($_[0], $1, $2); |
873 | my $string = $_[1]; |
|
|
874 | $_[0]->unshift_read (chunk => 1, sub { |
|
|
875 | if ($_[1] eq ",") { |
|
|
876 | $cb->($_[0], $string); |
|
|
877 | } else { |
|
|
878 | $self->_error (&Errno::EBADMSG); |
|
|
879 | } |
|
|
880 | }); |
988 | 1 |
881 | }); |
989 | } |
882 | |
|
|
883 | 1 |
|
|
884 | } |
990 | } |
885 | }; |
991 | }; |
886 | |
992 | |
887 | =item regex => $accept[, $reject[, $skip], $cb->($handle, $data) |
993 | =item regex => $accept[, $reject[, $skip], $cb->($handle, $data) |
888 | |
994 | |
… | |
… | |
952 | |
1058 | |
953 | () |
1059 | () |
954 | } |
1060 | } |
955 | }; |
1061 | }; |
956 | |
1062 | |
|
|
1063 | =item netstring => $cb->($handle, $string) |
|
|
1064 | |
|
|
1065 | A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement). |
|
|
1066 | |
|
|
1067 | Throws an error with C<$!> set to EBADMSG on format violations. |
|
|
1068 | |
|
|
1069 | =cut |
|
|
1070 | |
|
|
1071 | register_read_type netstring => sub { |
|
|
1072 | my ($self, $cb) = @_; |
|
|
1073 | |
|
|
1074 | sub { |
|
|
1075 | unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) { |
|
|
1076 | if ($_[0]{rbuf} =~ /[^0-9]/) { |
|
|
1077 | $self->_error (&Errno::EBADMSG); |
|
|
1078 | } |
|
|
1079 | return; |
|
|
1080 | } |
|
|
1081 | |
|
|
1082 | my $len = $1; |
|
|
1083 | |
|
|
1084 | $self->unshift_read (chunk => $len, sub { |
|
|
1085 | my $string = $_[1]; |
|
|
1086 | $_[0]->unshift_read (chunk => 1, sub { |
|
|
1087 | if ($_[1] eq ",") { |
|
|
1088 | $cb->($_[0], $string); |
|
|
1089 | } else { |
|
|
1090 | $self->_error (&Errno::EBADMSG); |
|
|
1091 | } |
|
|
1092 | }); |
|
|
1093 | }); |
|
|
1094 | |
|
|
1095 | 1 |
|
|
1096 | } |
|
|
1097 | }; |
|
|
1098 | |
|
|
1099 | =item packstring => $format, $cb->($handle, $string) |
|
|
1100 | |
|
|
1101 | An octet string prefixed with an encoded length. The encoding C<$format> |
|
|
1102 | uses the same format as a Perl C<pack> format, but must specify a single |
|
|
1103 | integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an |
|
|
1104 | optional C<!>, C<< < >> or C<< > >> modifier). |
|
|
1105 | |
|
|
1106 | For example, DNS over TCP uses a prefix of C<n> (2 octet network order), |
|
|
1107 | EPP uses a prefix of C<N> (4 octtes). |
|
|
1108 | |
|
|
1109 | Example: read a block of data prefixed by its length in BER-encoded |
|
|
1110 | format (very efficient). |
|
|
1111 | |
|
|
1112 | $handle->push_read (packstring => "w", sub { |
|
|
1113 | my ($handle, $data) = @_; |
|
|
1114 | }); |
|
|
1115 | |
|
|
1116 | =cut |
|
|
1117 | |
|
|
1118 | register_read_type packstring => sub { |
|
|
1119 | my ($self, $cb, $format) = @_; |
|
|
1120 | |
|
|
1121 | sub { |
|
|
1122 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
|
|
1123 | defined (my $len = eval { unpack $format, $_[0]{rbuf} }) |
|
|
1124 | or return; |
|
|
1125 | |
|
|
1126 | $format = length pack $format, $len; |
|
|
1127 | |
|
|
1128 | # bypass unshift if we already have the remaining chunk |
|
|
1129 | if ($format + $len <= length $_[0]{rbuf}) { |
|
|
1130 | my $data = substr $_[0]{rbuf}, $format, $len; |
|
|
1131 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
|
|
1132 | $cb->($_[0], $data); |
|
|
1133 | } else { |
|
|
1134 | # remove prefix |
|
|
1135 | substr $_[0]{rbuf}, 0, $format, ""; |
|
|
1136 | |
|
|
1137 | # read remaining chunk |
|
|
1138 | $_[0]->unshift_read (chunk => $len, $cb); |
|
|
1139 | } |
|
|
1140 | |
|
|
1141 | 1 |
|
|
1142 | } |
|
|
1143 | }; |
|
|
1144 | |
957 | =item json => $cb->($handle, $hash_or_arrayref) |
1145 | =item json => $cb->($handle, $hash_or_arrayref) |
958 | |
1146 | |
959 | Reads a JSON object or array, decodes it and passes it to the callback. |
1147 | Reads a JSON object or array, decodes it and passes it to the callback. |
960 | |
1148 | |
961 | If a C<json> object was passed to the constructor, then that will be used |
1149 | If a C<json> object was passed to the constructor, then that will be used |
… | |
… | |
971 | the C<json> write type description, above, for an actual example. |
1159 | the C<json> write type description, above, for an actual example. |
972 | |
1160 | |
973 | =cut |
1161 | =cut |
974 | |
1162 | |
975 | register_read_type json => sub { |
1163 | register_read_type json => sub { |
976 | my ($self, $cb, $accept, $reject, $skip) = @_; |
1164 | my ($self, $cb) = @_; |
977 | |
1165 | |
978 | require JSON; |
1166 | require JSON; |
979 | |
1167 | |
980 | my $data; |
1168 | my $data; |
981 | my $rbuf = \$self->{rbuf}; |
1169 | my $rbuf = \$self->{rbuf}; |
… | |
… | |
996 | () |
1184 | () |
997 | } |
1185 | } |
998 | } |
1186 | } |
999 | }; |
1187 | }; |
1000 | |
1188 | |
|
|
1189 | =item storable => $cb->($handle, $ref) |
|
|
1190 | |
|
|
1191 | Deserialises a L<Storable> frozen representation as written by the |
|
|
1192 | C<storable> write type (BER-encoded length prefix followed by nfreeze'd |
|
|
1193 | data). |
|
|
1194 | |
|
|
1195 | Raises C<EBADMSG> error if the data could not be decoded. |
|
|
1196 | |
|
|
1197 | =cut |
|
|
1198 | |
|
|
1199 | register_read_type storable => sub { |
|
|
1200 | my ($self, $cb) = @_; |
|
|
1201 | |
|
|
1202 | require Storable; |
|
|
1203 | |
|
|
1204 | sub { |
|
|
1205 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
|
|
1206 | defined (my $len = eval { unpack "w", $_[0]{rbuf} }) |
|
|
1207 | or return; |
|
|
1208 | |
|
|
1209 | my $format = length pack "w", $len; |
|
|
1210 | |
|
|
1211 | # bypass unshift if we already have the remaining chunk |
|
|
1212 | if ($format + $len <= length $_[0]{rbuf}) { |
|
|
1213 | my $data = substr $_[0]{rbuf}, $format, $len; |
|
|
1214 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
|
|
1215 | $cb->($_[0], Storable::thaw ($data)); |
|
|
1216 | } else { |
|
|
1217 | # remove prefix |
|
|
1218 | substr $_[0]{rbuf}, 0, $format, ""; |
|
|
1219 | |
|
|
1220 | # read remaining chunk |
|
|
1221 | $_[0]->unshift_read (chunk => $len, sub { |
|
|
1222 | if (my $ref = eval { Storable::thaw ($_[1]) }) { |
|
|
1223 | $cb->($_[0], $ref); |
|
|
1224 | } else { |
|
|
1225 | $self->_error (&Errno::EBADMSG); |
|
|
1226 | } |
|
|
1227 | }); |
|
|
1228 | } |
|
|
1229 | |
|
|
1230 | 1 |
|
|
1231 | } |
|
|
1232 | }; |
|
|
1233 | |
1001 | =back |
1234 | =back |
1002 | |
1235 | |
1003 | =item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args) |
1236 | =item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args) |
1004 | |
1237 | |
1005 | This function (not method) lets you add your own types to C<push_read>. |
1238 | This function (not method) lets you add your own types to C<push_read>. |
… | |
… | |
1023 | =item $handle->stop_read |
1256 | =item $handle->stop_read |
1024 | |
1257 | |
1025 | =item $handle->start_read |
1258 | =item $handle->start_read |
1026 | |
1259 | |
1027 | In rare cases you actually do not want to read anything from the |
1260 | In rare cases you actually do not want to read anything from the |
1028 | socket. In this case you can call C<stop_read>. Neither C<on_read> no |
1261 | socket. In this case you can call C<stop_read>. Neither C<on_read> nor |
1029 | any queued callbacks will be executed then. To start reading again, call |
1262 | any queued callbacks will be executed then. To start reading again, call |
1030 | C<start_read>. |
1263 | C<start_read>. |
1031 | |
1264 | |
|
|
1265 | Note that AnyEvent::Handle will automatically C<start_read> for you when |
|
|
1266 | you change the C<on_read> callback or push/unshift a read callback, and it |
|
|
1267 | will automatically C<stop_read> for you when neither C<on_read> is set nor |
|
|
1268 | there are any read requests in the queue. |
|
|
1269 | |
|
|
1270 | These methods will have no effect when in TLS mode (as TLS doesn't support |
|
|
1271 | half-duplex connections). |
|
|
1272 | |
1032 | =cut |
1273 | =cut |
1033 | |
1274 | |
1034 | sub stop_read { |
1275 | sub stop_read { |
1035 | my ($self) = @_; |
1276 | my ($self) = @_; |
1036 | |
1277 | |
1037 | delete $self->{_rw}; |
1278 | delete $self->{_rw} unless $self->{tls}; |
1038 | } |
1279 | } |
1039 | |
1280 | |
1040 | sub start_read { |
1281 | sub start_read { |
1041 | my ($self) = @_; |
1282 | my ($self) = @_; |
1042 | |
1283 | |
1043 | unless ($self->{_rw} || $self->{_eof}) { |
1284 | unless ($self->{_rw} || $self->{_eof}) { |
1044 | Scalar::Util::weaken $self; |
1285 | Scalar::Util::weaken $self; |
1045 | |
1286 | |
1046 | $self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
1287 | $self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
1047 | my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf}; |
1288 | my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf}); |
1048 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
1289 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
1049 | |
1290 | |
1050 | if ($len > 0) { |
1291 | if ($len > 0) { |
1051 | $self->{_activity} = AnyEvent->now; |
1292 | $self->{_activity} = AnyEvent->now; |
1052 | |
1293 | |
1053 | $self->{filter_r} |
1294 | if ($self->{tls}) { |
1054 | ? $self->{filter_r}($self, $rbuf) |
1295 | Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf); |
1055 | : $self->_drain_rbuf; |
1296 | &_dotls ($self); |
|
|
1297 | } else { |
|
|
1298 | $self->_drain_rbuf unless $self->{_in_drain}; |
|
|
1299 | } |
1056 | |
1300 | |
1057 | } elsif (defined $len) { |
1301 | } elsif (defined $len) { |
1058 | delete $self->{_rw}; |
1302 | delete $self->{_rw}; |
1059 | $self->{_eof} = 1; |
1303 | $self->{_eof} = 1; |
1060 | $self->_drain_rbuf; |
1304 | $self->_drain_rbuf unless $self->{_in_drain}; |
1061 | |
1305 | |
1062 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
1306 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
1063 | return $self->_error ($!, 1); |
1307 | return $self->_error ($!, 1); |
1064 | } |
1308 | } |
1065 | }); |
1309 | }); |
… | |
… | |
1067 | } |
1311 | } |
1068 | |
1312 | |
1069 | sub _dotls { |
1313 | sub _dotls { |
1070 | my ($self) = @_; |
1314 | my ($self) = @_; |
1071 | |
1315 | |
|
|
1316 | my $buf; |
|
|
1317 | |
1072 | if (length $self->{_tls_wbuf}) { |
1318 | if (length $self->{_tls_wbuf}) { |
1073 | while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) { |
1319 | while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) { |
1074 | substr $self->{_tls_wbuf}, 0, $len, ""; |
1320 | substr $self->{_tls_wbuf}, 0, $len, ""; |
1075 | } |
1321 | } |
1076 | } |
1322 | } |
1077 | |
1323 | |
1078 | if (defined (my $buf = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
|
|
1079 | $self->{wbuf} .= $buf; |
|
|
1080 | $self->_drain_wbuf; |
|
|
1081 | } |
|
|
1082 | |
|
|
1083 | while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) { |
1324 | while (defined ($buf = Net::SSLeay::read ($self->{tls}))) { |
|
|
1325 | unless (length $buf) { |
|
|
1326 | # let's treat SSL-eof as we treat normal EOF |
|
|
1327 | delete $self->{_rw}; |
|
|
1328 | $self->{_eof} = 1; |
|
|
1329 | &_freetls; |
|
|
1330 | } |
|
|
1331 | |
1084 | $self->{rbuf} .= $buf; |
1332 | $self->{rbuf} .= $buf; |
1085 | $self->_drain_rbuf; |
1333 | $self->_drain_rbuf unless $self->{_in_drain}; |
|
|
1334 | $self->{tls} or return; # tls session might have gone away in callback |
1086 | } |
1335 | } |
1087 | |
1336 | |
1088 | my $err = Net::SSLeay::get_error ($self->{tls}, -1); |
1337 | my $err = Net::SSLeay::get_error ($self->{tls}, -1); |
1089 | |
1338 | |
1090 | if ($err!= Net::SSLeay::ERROR_WANT_READ ()) { |
1339 | if ($err!= Net::SSLeay::ERROR_WANT_READ ()) { |
… | |
… | |
1094 | return $self->_error (&Errno::EIO, 1); |
1343 | return $self->_error (&Errno::EIO, 1); |
1095 | } |
1344 | } |
1096 | |
1345 | |
1097 | # all others are fine for our purposes |
1346 | # all others are fine for our purposes |
1098 | } |
1347 | } |
|
|
1348 | |
|
|
1349 | while (length ($buf = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
|
|
1350 | $self->{wbuf} .= $buf; |
|
|
1351 | $self->_drain_wbuf; |
|
|
1352 | } |
1099 | } |
1353 | } |
1100 | |
1354 | |
1101 | =item $handle->starttls ($tls[, $tls_ctx]) |
1355 | =item $handle->starttls ($tls[, $tls_ctx]) |
1102 | |
1356 | |
1103 | Instead of starting TLS negotiation immediately when the AnyEvent::Handle |
1357 | Instead of starting TLS negotiation immediately when the AnyEvent::Handle |
… | |
… | |
1112 | |
1366 | |
1113 | The TLS connection object will end up in C<< $handle->{tls} >> after this |
1367 | The TLS connection object will end up in C<< $handle->{tls} >> after this |
1114 | call and can be used or changed to your liking. Note that the handshake |
1368 | call and can be used or changed to your liking. Note that the handshake |
1115 | might have already started when this function returns. |
1369 | might have already started when this function returns. |
1116 | |
1370 | |
|
|
1371 | If it an error to start a TLS handshake more than once per |
|
|
1372 | AnyEvent::Handle object (this is due to bugs in OpenSSL). |
|
|
1373 | |
1117 | =cut |
1374 | =cut |
1118 | |
1375 | |
1119 | sub starttls { |
1376 | sub starttls { |
1120 | my ($self, $ssl, $ctx) = @_; |
1377 | my ($self, $ssl, $ctx) = @_; |
1121 | |
1378 | |
1122 | $self->stoptls; |
1379 | require Net::SSLeay; |
1123 | |
1380 | |
|
|
1381 | Carp::croak "it is an error to call starttls more than once on an Anyevent::Handle object" |
|
|
1382 | if $self->{tls}; |
|
|
1383 | |
1124 | if ($ssl eq "accept") { |
1384 | if ($ssl eq "accept") { |
1125 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
1385 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
1126 | Net::SSLeay::set_accept_state ($ssl); |
1386 | Net::SSLeay::set_accept_state ($ssl); |
1127 | } elsif ($ssl eq "connect") { |
1387 | } elsif ($ssl eq "connect") { |
1128 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
1388 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
… | |
… | |
1134 | # basically, this is deep magic (because SSL_read should have the same issues) |
1394 | # basically, this is deep magic (because SSL_read should have the same issues) |
1135 | # but the openssl maintainers basically said: "trust us, it just works". |
1395 | # but the openssl maintainers basically said: "trust us, it just works". |
1136 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
1396 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
1137 | # and mismaintained ssleay-module doesn't even offer them). |
1397 | # and mismaintained ssleay-module doesn't even offer them). |
1138 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
1398 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
|
|
1399 | # |
|
|
1400 | # in short: this is a mess. |
|
|
1401 | # |
|
|
1402 | # note that we do not try to keep the length constant between writes as we are required to do. |
|
|
1403 | # we assume that most (but not all) of this insanity only applies to non-blocking cases, |
|
|
1404 | # and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to |
|
|
1405 | # have identity issues in that area. |
1139 | Net::SSLeay::CTX_set_mode ($self->{tls}, |
1406 | Net::SSLeay::CTX_set_mode ($self->{tls}, |
1140 | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
1407 | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
1141 | | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
1408 | | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
1142 | |
1409 | |
1143 | $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1410 | $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1144 | $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1411 | $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1145 | |
1412 | |
1146 | Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio}); |
1413 | Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio}); |
1147 | |
1414 | |
1148 | $self->{filter_w} = sub { |
1415 | &_dotls; # need to trigger the initial handshake |
1149 | $_[0]{_tls_wbuf} .= ${$_[1]}; |
1416 | $self->start_read; # make sure we actually do read |
1150 | &_dotls; |
|
|
1151 | }; |
|
|
1152 | $self->{filter_r} = sub { |
|
|
1153 | Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]}); |
|
|
1154 | &_dotls; |
|
|
1155 | }; |
|
|
1156 | } |
1417 | } |
1157 | |
1418 | |
1158 | =item $handle->stoptls |
1419 | =item $handle->stoptls |
1159 | |
1420 | |
1160 | Destroys the SSL connection, if any. Partial read or write data will be |
1421 | Shuts down the SSL connection - this makes a proper EOF handshake by |
1161 | lost. |
1422 | sending a close notify to the other side, but since OpenSSL doesn't |
|
|
1423 | support non-blocking shut downs, it is not possible to re-use the stream |
|
|
1424 | afterwards. |
1162 | |
1425 | |
1163 | =cut |
1426 | =cut |
1164 | |
1427 | |
1165 | sub stoptls { |
1428 | sub stoptls { |
1166 | my ($self) = @_; |
1429 | my ($self) = @_; |
1167 | |
1430 | |
|
|
1431 | if ($self->{tls}) { |
|
|
1432 | Net::SSLeay::shutdown ($self->{tls}); |
|
|
1433 | |
|
|
1434 | &_dotls; |
|
|
1435 | |
|
|
1436 | # we don't give a shit. no, we do, but we can't. no... |
|
|
1437 | # we, we... have to use openssl :/ |
|
|
1438 | &_freetls; |
|
|
1439 | } |
|
|
1440 | } |
|
|
1441 | |
|
|
1442 | sub _freetls { |
|
|
1443 | my ($self) = @_; |
|
|
1444 | |
|
|
1445 | return unless $self->{tls}; |
|
|
1446 | |
1168 | Net::SSLeay::free (delete $self->{tls}) if $self->{tls}; |
1447 | Net::SSLeay::free (delete $self->{tls}); |
1169 | |
1448 | |
1170 | delete $self->{_rbio}; |
1449 | delete @$self{qw(_rbio _wbio _tls_wbuf)}; |
1171 | delete $self->{_wbio}; |
|
|
1172 | delete $self->{_tls_wbuf}; |
|
|
1173 | delete $self->{filter_r}; |
|
|
1174 | delete $self->{filter_w}; |
|
|
1175 | } |
1450 | } |
1176 | |
1451 | |
1177 | sub DESTROY { |
1452 | sub DESTROY { |
1178 | my $self = shift; |
1453 | my $self = shift; |
1179 | |
1454 | |
1180 | $self->stoptls; |
1455 | &_freetls; |
|
|
1456 | |
|
|
1457 | my $linger = exists $self->{linger} ? $self->{linger} : 3600; |
|
|
1458 | |
|
|
1459 | if ($linger && length $self->{wbuf}) { |
|
|
1460 | my $fh = delete $self->{fh}; |
|
|
1461 | my $wbuf = delete $self->{wbuf}; |
|
|
1462 | |
|
|
1463 | my @linger; |
|
|
1464 | |
|
|
1465 | push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub { |
|
|
1466 | my $len = syswrite $fh, $wbuf, length $wbuf; |
|
|
1467 | |
|
|
1468 | if ($len > 0) { |
|
|
1469 | substr $wbuf, 0, $len, ""; |
|
|
1470 | } else { |
|
|
1471 | @linger = (); # end |
|
|
1472 | } |
|
|
1473 | }); |
|
|
1474 | push @linger, AnyEvent->timer (after => $linger, cb => sub { |
|
|
1475 | @linger = (); |
|
|
1476 | }); |
|
|
1477 | } |
1181 | } |
1478 | } |
1182 | |
1479 | |
1183 | =item AnyEvent::Handle::TLS_CTX |
1480 | =item AnyEvent::Handle::TLS_CTX |
1184 | |
1481 | |
1185 | This function creates and returns the Net::SSLeay::CTX object used by |
1482 | This function creates and returns the Net::SSLeay::CTX object used by |
… | |
… | |
1215 | } |
1512 | } |
1216 | } |
1513 | } |
1217 | |
1514 | |
1218 | =back |
1515 | =back |
1219 | |
1516 | |
|
|
1517 | |
|
|
1518 | =head1 NONFREQUENTLY ASKED QUESTIONS |
|
|
1519 | |
|
|
1520 | =over 4 |
|
|
1521 | |
|
|
1522 | =item How do I read data until the other side closes the connection? |
|
|
1523 | |
|
|
1524 | If you just want to read your data into a perl scalar, the easiest way |
|
|
1525 | to achieve this is by setting an C<on_read> callback that does nothing, |
|
|
1526 | clearing the C<on_eof> callback and in the C<on_error> callback, the data |
|
|
1527 | will be in C<$_[0]{rbuf}>: |
|
|
1528 | |
|
|
1529 | $handle->on_read (sub { }); |
|
|
1530 | $handle->on_eof (undef); |
|
|
1531 | $handle->on_error (sub { |
|
|
1532 | my $data = delete $_[0]{rbuf}; |
|
|
1533 | undef $handle; |
|
|
1534 | }); |
|
|
1535 | |
|
|
1536 | The reason to use C<on_error> is that TCP connections, due to latencies |
|
|
1537 | and packets loss, might get closed quite violently with an error, when in |
|
|
1538 | fact, all data has been received. |
|
|
1539 | |
|
|
1540 | It is usually better to use acknowledgements when transfering data, |
|
|
1541 | to make sure the other side hasn't just died and you got the data |
|
|
1542 | intact. This is also one reason why so many internet protocols have an |
|
|
1543 | explicit QUIT command. |
|
|
1544 | |
|
|
1545 | |
|
|
1546 | =item I don't want to destroy the handle too early - how do I wait until |
|
|
1547 | all data has been written? |
|
|
1548 | |
|
|
1549 | After writing your last bits of data, set the C<on_drain> callback |
|
|
1550 | and destroy the handle in there - with the default setting of |
|
|
1551 | C<low_water_mark> this will be called precisely when all data has been |
|
|
1552 | written to the socket: |
|
|
1553 | |
|
|
1554 | $handle->push_write (...); |
|
|
1555 | $handle->on_drain (sub { |
|
|
1556 | warn "all data submitted to the kernel\n"; |
|
|
1557 | undef $handle; |
|
|
1558 | }); |
|
|
1559 | |
|
|
1560 | =back |
|
|
1561 | |
|
|
1562 | |
1220 | =head1 SUBCLASSING AnyEvent::Handle |
1563 | =head1 SUBCLASSING AnyEvent::Handle |
1221 | |
1564 | |
1222 | In many cases, you might want to subclass AnyEvent::Handle. |
1565 | In many cases, you might want to subclass AnyEvent::Handle. |
1223 | |
1566 | |
1224 | To make this easier, a given version of AnyEvent::Handle uses these |
1567 | To make this easier, a given version of AnyEvent::Handle uses these |
… | |
… | |
1227 | =over 4 |
1570 | =over 4 |
1228 | |
1571 | |
1229 | =item * all constructor arguments become object members. |
1572 | =item * all constructor arguments become object members. |
1230 | |
1573 | |
1231 | At least initially, when you pass a C<tls>-argument to the constructor it |
1574 | At least initially, when you pass a C<tls>-argument to the constructor it |
1232 | will end up in C<< $handle->{tls} >>. Those members might be changes or |
1575 | will end up in C<< $handle->{tls} >>. Those members might be changed or |
1233 | mutated later on (for example C<tls> will hold the TLS connection object). |
1576 | mutated later on (for example C<tls> will hold the TLS connection object). |
1234 | |
1577 | |
1235 | =item * other object member names are prefixed with an C<_>. |
1578 | =item * other object member names are prefixed with an C<_>. |
1236 | |
1579 | |
1237 | All object members not explicitly documented (internal use) are prefixed |
1580 | All object members not explicitly documented (internal use) are prefixed |