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 (); |
7 | use AnyEvent::Util qw(WSAEWOULDBLOCK); |
8 | use Scalar::Util (); |
8 | use Scalar::Util (); |
9 | use Carp (); |
9 | use Carp (); |
10 | use Fcntl (); |
10 | use Fcntl (); |
11 | use Errno qw/EAGAIN EINTR/; |
11 | use Errno qw(EAGAIN EINTR); |
12 | |
12 | |
13 | =head1 NAME |
13 | =head1 NAME |
14 | |
14 | |
15 | AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent |
15 | AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent |
16 | |
16 | |
17 | This module is experimental. |
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18 | |
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19 | =cut |
17 | =cut |
20 | |
18 | |
21 | our $VERSION = '0.04'; |
19 | our $VERSION = 4.452; |
22 | |
20 | |
23 | =head1 SYNOPSIS |
21 | =head1 SYNOPSIS |
24 | |
22 | |
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->send; |
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 |
51 | on sockets see L<AnyEvent::Util>. |
52 | on sockets see L<AnyEvent::Util>. |
52 | |
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 | |
53 | 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 |
54 | 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 |
55 | treatment of characters applies to this module as well. |
59 | treatment of characters applies to this module as well. |
56 | |
60 | |
57 | 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 | |
63 | |
60 | =head1 METHODS |
64 | =head1 METHODS |
61 | |
65 | |
62 | =over 4 |
66 | =over 4 |
63 | |
67 | |
64 | =item B<new (%args)> |
68 | =item $handle = B<new> AnyEvent::TLS fh => $filehandle, key => value... |
65 | |
69 | |
66 | The constructor supports these arguments (all as key => value pairs). |
70 | The constructor supports these arguments (all as C<< key => value >> pairs). |
67 | |
71 | |
68 | =over 4 |
72 | =over 4 |
69 | |
73 | |
70 | =item fh => $filehandle [MANDATORY] |
74 | =item fh => $filehandle [MANDATORY] |
71 | |
75 | |
72 | The filehandle this L<AnyEvent::Handle> object will operate on. |
76 | The filehandle this L<AnyEvent::Handle> object will operate on. |
73 | |
77 | |
74 | NOTE: The filehandle will be set to non-blocking (using |
78 | NOTE: The filehandle will be set to non-blocking mode (using |
75 | AnyEvent::Util::fh_nonblocking). |
79 | C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in |
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80 | that mode. |
76 | |
81 | |
77 | =item on_eof => $cb->($self) |
82 | =item on_eof => $cb->($handle) |
78 | |
83 | |
79 | Set the callback to be called on EOF. |
84 | Set the callback to be called when an end-of-file condition is detected, |
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85 | i.e. in the case of a socket, when the other side has closed the |
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86 | connection cleanly. |
80 | |
87 | |
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88 | For sockets, this just means that the other side has stopped sending data, |
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89 | you can still try to write data, and, in fact, one can return from the EOF |
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90 | callback and continue writing data, as only the read part has been shut |
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91 | down. |
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92 | |
81 | While not mandatory, it is highly recommended to set an eof callback, |
93 | While not mandatory, it is I<highly> recommended to set an EOF callback, |
82 | otherwise you might end up with a closed socket while you are still |
94 | otherwise you might end up with a closed socket while you are still |
83 | waiting for data. |
95 | waiting for data. |
84 | |
96 | |
85 | =item on_error => $cb->($self) |
97 | If an EOF condition has been detected but no C<on_eof> callback has been |
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98 | set, then a fatal error will be raised with C<$!> set to <0>. |
86 | |
99 | |
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100 | =item on_error => $cb->($handle, $fatal, $message) |
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101 | |
87 | This is the fatal error callback, that is called when, well, a fatal error |
102 | This is the error callback, which is called when, well, some error |
88 | occurs, such as not being able to resolve the hostname, failure to connect |
103 | occured, such as not being able to resolve the hostname, failure to |
89 | or a read error. |
104 | connect or a read error. |
90 | |
105 | |
91 | The object will not be in a usable state when this callback has been |
106 | Some errors are fatal (which is indicated by C<$fatal> being true). On |
92 | called. |
107 | fatal errors the handle object will be shut down and will not be usable |
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108 | (but you are free to look at the current C<< ->rbuf >>). Examples of fatal |
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109 | errors are an EOF condition with active (but unsatisifable) read watchers |
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110 | (C<EPIPE>) or I/O errors. |
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111 | |
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112 | AnyEvent::Handle tries to find an appropriate error code for you to check |
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113 | against, but in some cases (TLS errors), this does not work well. It is |
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114 | recommended to always output the C<$message> argument in human-readable |
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115 | error messages (it's usually the same as C<"$!">). |
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116 | |
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117 | Non-fatal errors can be retried by simply returning, but it is recommended |
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118 | to simply ignore this parameter and instead abondon the handle object |
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119 | when this callback is invoked. Examples of non-fatal errors are timeouts |
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120 | C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>). |
93 | |
121 | |
94 | On callback entrance, the value of C<$!> contains the operating system |
122 | On callback entrance, the value of C<$!> contains the operating system |
95 | error (or C<ENOSPC> or C<EPIPE>). |
123 | error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or |
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124 | C<EPROTO>). |
96 | |
125 | |
97 | While not mandatory, it is I<highly> recommended to set this callback, as |
126 | 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 |
127 | you will not be notified of errors otherwise. The default simply calls |
99 | die. |
128 | C<croak>. |
100 | |
129 | |
101 | =item on_read => $cb->($self) |
130 | =item on_read => $cb->($handle) |
102 | |
131 | |
103 | This sets the default read callback, which is called when data arrives |
132 | This sets the default read callback, which is called when data arrives |
104 | and no read request is in the queue. |
133 | and no read request is in the queue (unlike read queue callbacks, this |
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134 | callback will only be called when at least one octet of data is in the |
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135 | read buffer). |
105 | |
136 | |
106 | To access (and remove data from) the read buffer, use the C<< ->rbuf >> |
137 | To access (and remove data from) the read buffer, use the C<< ->rbuf >> |
107 | method or access the C<$self->{rbuf}> member directly. |
138 | method or access the C<< $handle->{rbuf} >> member directly. Note that you |
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139 | must not enlarge or modify the read buffer, you can only remove data at |
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140 | the beginning from it. |
108 | |
141 | |
109 | When an EOF condition is detected then AnyEvent::Handle will first try to |
142 | When an EOF condition is detected then AnyEvent::Handle will first try to |
110 | feed all the remaining data to the queued callbacks and C<on_read> before |
143 | feed all the remaining data to the queued callbacks and C<on_read> before |
111 | calling the C<on_eof> callback. If no progress can be made, then a fatal |
144 | calling the C<on_eof> callback. If no progress can be made, then a fatal |
112 | error will be raised (with C<$!> set to C<EPIPE>). |
145 | error will be raised (with C<$!> set to C<EPIPE>). |
113 | |
146 | |
114 | =item on_drain => $cb->() |
147 | =item on_drain => $cb->($handle) |
115 | |
148 | |
116 | 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 |
117 | (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). |
118 | |
151 | |
119 | 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. |
120 | |
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 | |
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160 | =item timeout => $fractional_seconds |
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161 | |
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162 | If non-zero, then this enables an "inactivity" timeout: whenever this many |
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163 | seconds pass without a successful read or write on the underlying file |
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164 | handle, the C<on_timeout> callback will be invoked (and if that one is |
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165 | missing, a non-fatal C<ETIMEDOUT> error will be raised). |
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166 | |
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167 | Note that timeout processing is also active when you currently do not have |
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168 | any outstanding read or write requests: If you plan to keep the connection |
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169 | idle then you should disable the timout temporarily or ignore the timeout |
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170 | in the C<on_timeout> callback, in which case AnyEvent::Handle will simply |
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171 | restart the timeout. |
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172 | |
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173 | Zero (the default) disables this timeout. |
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174 | |
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175 | =item on_timeout => $cb->($handle) |
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176 | |
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177 | Called whenever the inactivity timeout passes. If you return from this |
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178 | callback, then the timeout will be reset as if some activity had happened, |
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179 | so this condition is not fatal in any way. |
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180 | |
121 | =item rbuf_max => <bytes> |
181 | =item rbuf_max => <bytes> |
122 | |
182 | |
123 | 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>) |
124 | 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 |
125 | avoid denial-of-service attacks. |
185 | avoid some forms of denial-of-service attacks. |
126 | |
186 | |
127 | For example, a server accepting connections from untrusted sources should |
187 | For example, a server accepting connections from untrusted sources should |
128 | 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 |
129 | (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 |
130 | 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 |
131 | isn't finished). |
191 | isn't finished). |
132 | |
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 | |
133 | =item read_size => <bytes> |
219 | =item read_size => <bytes> |
134 | |
220 | |
135 | 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 |
136 | on each [loop iteration). Default: C<4096>. |
222 | try to read during each loop iteration, which affects memory |
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223 | requirements). Default: C<8192>. |
137 | |
224 | |
138 | =item low_water_mark => <bytes> |
225 | =item low_water_mark => <bytes> |
139 | |
226 | |
140 | 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 |
141 | 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 |
142 | considered empty. |
229 | considered empty. |
143 | |
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 | |
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248 | =item peername => $string |
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249 | |
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250 | A string used to identify the remote site - usually the DNS hostname |
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251 | (I<not> IDN!) used to create the connection, rarely the IP address. |
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252 | |
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253 | Apart from being useful in error messages, this string is also used in TLS |
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254 | peername verification (see C<verify_peername> in L<AnyEvent::TLS>). |
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255 | |
144 | =item tls => "accept" | "connect" | Net::SSLeay::SSL object |
256 | =item tls => "accept" | "connect" | Net::SSLeay::SSL object |
145 | |
257 | |
146 | When this parameter is given, it enables TLS (SSL) mode, that means it |
258 | When this parameter is given, it enables TLS (SSL) mode, that means |
147 | will start making tls handshake and will transparently encrypt/decrypt |
259 | AnyEvent will start a TLS handshake as soon as the conenction has been |
148 | data. |
260 | established and will transparently encrypt/decrypt data afterwards. |
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261 | |
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262 | All TLS protocol errors will be signalled as C<EPROTO>, with an |
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263 | appropriate error message. |
149 | |
264 | |
150 | TLS mode requires Net::SSLeay to be installed (it will be loaded |
265 | TLS mode requires Net::SSLeay to be installed (it will be loaded |
151 | automatically when you try to create a TLS handle). |
266 | automatically when you try to create a TLS handle): this module doesn't |
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267 | have a dependency on that module, so if your module requires it, you have |
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268 | to add the dependency yourself. |
152 | |
269 | |
153 | For the TLS server side, use C<accept>, and for the TLS client side of a |
270 | Unlike TCP, TLS has a server and client side: for the TLS server side, use |
154 | connection, use C<connect> mode. |
271 | C<accept>, and for the TLS client side of a connection, use C<connect> |
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272 | mode. |
155 | |
273 | |
156 | You can also provide your own TLS connection object, but you have |
274 | You can also provide your own TLS connection object, but you have |
157 | to make sure that you call either C<Net::SSLeay::set_connect_state> |
275 | to make sure that you call either C<Net::SSLeay::set_connect_state> |
158 | or C<Net::SSLeay::set_accept_state> on it before you pass it to |
276 | or C<Net::SSLeay::set_accept_state> on it before you pass it to |
159 | AnyEvent::Handle. |
277 | AnyEvent::Handle. Also, this module will take ownership of this connection |
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278 | object. |
160 | |
279 | |
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280 | At some future point, AnyEvent::Handle might switch to another TLS |
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281 | implementation, then the option to use your own session object will go |
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282 | away. |
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283 | |
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284 | B<IMPORTANT:> since Net::SSLeay "objects" are really only integers, |
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285 | passing in the wrong integer will lead to certain crash. This most often |
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286 | happens when one uses a stylish C<< tls => 1 >> and is surprised about the |
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287 | segmentation fault. |
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288 | |
161 | See the C<starttls> method if you need to start TLs negotiation later. |
289 | See the C<< ->starttls >> method for when need to start TLS negotiation later. |
162 | |
290 | |
163 | =item tls_ctx => $ssl_ctx |
291 | =item tls_ctx => $anyevent_tls |
164 | |
292 | |
165 | Use the given Net::SSLeay::CTX object to create the new TLS connection |
293 | Use the given C<AnyEvent::TLS> object to create the new TLS connection |
166 | (unless a connection object was specified directly). If this parameter is |
294 | (unless a connection object was specified directly). If this parameter is |
167 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
295 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
168 | |
296 | |
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297 | Instead of an object, you can also specify a hash reference with C<< key |
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298 | => value >> pairs. Those will be passed to L<AnyEvent::TLS> to create a |
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299 | new TLS context object. |
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300 | |
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301 | =item on_starttls => $cb->($handle, $success) |
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302 | |
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303 | This callback will be invoked when the TLS/SSL handshake has finished. If |
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304 | C<$success> is true, then the TLS handshake succeeded, otherwise it failed |
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305 | (C<on_stoptls> will not be called in this case). |
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306 | |
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307 | The session in C<< $handle->{tls} >> can still be examined in this |
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308 | callback, even when the handshake was not successful. |
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309 | |
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310 | =item on_stoptls => $cb->($handle) |
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311 | |
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312 | When a SSLv3/TLS shutdown/close notify/EOF is detected and this callback is |
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313 | set, then it will be invoked after freeing the TLS session. If it is not, |
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314 | then a TLS shutdown condition will be treated like a normal EOF condition |
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315 | on the handle. |
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316 | |
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317 | The session in C<< $handle->{tls} >> can still be examined in this |
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318 | callback. |
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319 | |
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320 | This callback will only be called on TLS shutdowns, not when the |
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321 | underlying handle signals EOF. |
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322 | |
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323 | =item json => JSON or JSON::XS object |
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324 | |
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325 | This is the json coder object used by the C<json> read and write types. |
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326 | |
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327 | If you don't supply it, then AnyEvent::Handle will create and use a |
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328 | suitable one (on demand), which will write and expect UTF-8 encoded JSON |
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329 | texts. |
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330 | |
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331 | Note that you are responsible to depend on the JSON module if you want to |
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332 | use this functionality, as AnyEvent does not have a dependency itself. |
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333 | |
169 | =back |
334 | =back |
170 | |
335 | |
171 | =cut |
336 | =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 | |
337 | |
183 | sub new { |
338 | sub new { |
184 | my $class = shift; |
339 | my $class = shift; |
185 | |
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186 | my $self = bless { @_ }, $class; |
340 | my $self = bless { @_ }, $class; |
187 | |
341 | |
188 | $self->{fh} or Carp::croak "mandatory argument fh is missing"; |
342 | $self->{fh} or Carp::croak "mandatory argument fh is missing"; |
189 | |
343 | |
190 | AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
344 | AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
191 | |
345 | |
192 | if ($self->{tls}) { |
346 | $self->{_activity} = AnyEvent->now; |
193 | require Net::SSLeay; |
347 | $self->_timeout; |
|
|
348 | |
|
|
349 | $self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay}; |
|
|
350 | |
194 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}); |
351 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}) |
195 | } |
352 | if $self->{tls}; |
196 | |
353 | |
197 | $self->on_eof (delete $self->{on_eof} ) if $self->{on_eof}; |
|
|
198 | $self->on_error (delete $self->{on_error}) if $self->{on_error}; |
|
|
199 | $self->on_drain (delete $self->{on_drain}) if $self->{on_drain}; |
354 | $self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain}; |
200 | $self->on_read (delete $self->{on_read} ) if $self->{on_read}; |
|
|
201 | |
355 | |
202 | $self->start_read; |
356 | $self->start_read |
|
|
357 | if $self->{on_read}; |
203 | |
358 | |
204 | $self |
359 | $self->{fh} && $self |
205 | } |
360 | } |
206 | |
361 | |
207 | sub _shutdown { |
362 | sub _shutdown { |
208 | my ($self) = @_; |
363 | my ($self) = @_; |
209 | |
364 | |
210 | delete $self->{rw}; |
365 | delete @$self{qw(_tw _rw _ww fh wbuf on_read _queue)}; |
211 | delete $self->{ww}; |
366 | $self->{_eof} = 1; # tell starttls et. al to stop trying |
212 | delete $self->{fh}; |
|
|
213 | } |
|
|
214 | |
367 | |
|
|
368 | &_freetls; |
|
|
369 | } |
|
|
370 | |
215 | sub error { |
371 | sub _error { |
216 | my ($self) = @_; |
372 | my ($self, $errno, $fatal, $message) = @_; |
217 | |
373 | |
218 | { |
|
|
219 | local $!; |
|
|
220 | $self->_shutdown; |
374 | $self->_shutdown |
221 | } |
375 | if $fatal; |
|
|
376 | |
|
|
377 | $! = $errno; |
|
|
378 | $message ||= "$!"; |
222 | |
379 | |
223 | if ($self->{on_error}) { |
380 | if ($self->{on_error}) { |
224 | $self->{on_error}($self); |
381 | $self->{on_error}($self, $fatal, $message); |
225 | } else { |
382 | } elsif ($self->{fh}) { |
226 | die "AnyEvent::Handle uncaught fatal error: $!"; |
383 | Carp::croak "AnyEvent::Handle uncaught error: $message"; |
227 | } |
384 | } |
228 | } |
385 | } |
229 | |
386 | |
230 | =item $fh = $handle->fh |
387 | =item $fh = $handle->fh |
231 | |
388 | |
232 | This method returns the file handle of the L<AnyEvent::Handle> object. |
389 | This method returns the file handle used to create the L<AnyEvent::Handle> object. |
233 | |
390 | |
234 | =cut |
391 | =cut |
235 | |
392 | |
236 | sub fh { $_[0]->{fh} } |
393 | sub fh { $_[0]{fh} } |
237 | |
394 | |
238 | =item $handle->on_error ($cb) |
395 | =item $handle->on_error ($cb) |
239 | |
396 | |
240 | Replace the current C<on_error> callback (see the C<on_error> constructor argument). |
397 | Replace the current C<on_error> callback (see the C<on_error> constructor argument). |
241 | |
398 | |
… | |
… | |
253 | |
410 | |
254 | sub on_eof { |
411 | sub on_eof { |
255 | $_[0]{on_eof} = $_[1]; |
412 | $_[0]{on_eof} = $_[1]; |
256 | } |
413 | } |
257 | |
414 | |
|
|
415 | =item $handle->on_timeout ($cb) |
|
|
416 | |
|
|
417 | Replace the current C<on_timeout> callback, or disables the callback (but |
|
|
418 | not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor |
|
|
419 | argument and method. |
|
|
420 | |
|
|
421 | =cut |
|
|
422 | |
|
|
423 | sub on_timeout { |
|
|
424 | $_[0]{on_timeout} = $_[1]; |
|
|
425 | } |
|
|
426 | |
|
|
427 | =item $handle->autocork ($boolean) |
|
|
428 | |
|
|
429 | Enables or disables the current autocork behaviour (see C<autocork> |
|
|
430 | constructor argument). Changes will only take effect on the next write. |
|
|
431 | |
|
|
432 | =cut |
|
|
433 | |
|
|
434 | sub autocork { |
|
|
435 | $_[0]{autocork} = $_[1]; |
|
|
436 | } |
|
|
437 | |
|
|
438 | =item $handle->no_delay ($boolean) |
|
|
439 | |
|
|
440 | Enables or disables the C<no_delay> setting (see constructor argument of |
|
|
441 | the same name for details). |
|
|
442 | |
|
|
443 | =cut |
|
|
444 | |
|
|
445 | sub no_delay { |
|
|
446 | $_[0]{no_delay} = $_[1]; |
|
|
447 | |
|
|
448 | eval { |
|
|
449 | local $SIG{__DIE__}; |
|
|
450 | setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1]; |
|
|
451 | }; |
|
|
452 | } |
|
|
453 | |
|
|
454 | =item $handle->on_starttls ($cb) |
|
|
455 | |
|
|
456 | Replace the current C<on_starttls> callback (see the C<on_starttls> constructor argument). |
|
|
457 | |
|
|
458 | =cut |
|
|
459 | |
|
|
460 | sub on_starttls { |
|
|
461 | $_[0]{on_starttls} = $_[1]; |
|
|
462 | } |
|
|
463 | |
|
|
464 | =item $handle->on_stoptls ($cb) |
|
|
465 | |
|
|
466 | Replace the current C<on_stoptls> callback (see the C<on_stoptls> constructor argument). |
|
|
467 | |
|
|
468 | =cut |
|
|
469 | |
|
|
470 | sub on_starttls { |
|
|
471 | $_[0]{on_stoptls} = $_[1]; |
|
|
472 | } |
|
|
473 | |
|
|
474 | ############################################################################# |
|
|
475 | |
|
|
476 | =item $handle->timeout ($seconds) |
|
|
477 | |
|
|
478 | Configures (or disables) the inactivity timeout. |
|
|
479 | |
|
|
480 | =cut |
|
|
481 | |
|
|
482 | sub timeout { |
|
|
483 | my ($self, $timeout) = @_; |
|
|
484 | |
|
|
485 | $self->{timeout} = $timeout; |
|
|
486 | $self->_timeout; |
|
|
487 | } |
|
|
488 | |
|
|
489 | # reset the timeout watcher, as neccessary |
|
|
490 | # also check for time-outs |
|
|
491 | sub _timeout { |
|
|
492 | my ($self) = @_; |
|
|
493 | |
|
|
494 | if ($self->{timeout}) { |
|
|
495 | my $NOW = AnyEvent->now; |
|
|
496 | |
|
|
497 | # when would the timeout trigger? |
|
|
498 | my $after = $self->{_activity} + $self->{timeout} - $NOW; |
|
|
499 | |
|
|
500 | # now or in the past already? |
|
|
501 | if ($after <= 0) { |
|
|
502 | $self->{_activity} = $NOW; |
|
|
503 | |
|
|
504 | if ($self->{on_timeout}) { |
|
|
505 | $self->{on_timeout}($self); |
|
|
506 | } else { |
|
|
507 | $self->_error (&Errno::ETIMEDOUT); |
|
|
508 | } |
|
|
509 | |
|
|
510 | # callback could have changed timeout value, optimise |
|
|
511 | return unless $self->{timeout}; |
|
|
512 | |
|
|
513 | # calculate new after |
|
|
514 | $after = $self->{timeout}; |
|
|
515 | } |
|
|
516 | |
|
|
517 | Scalar::Util::weaken $self; |
|
|
518 | return unless $self; # ->error could have destroyed $self |
|
|
519 | |
|
|
520 | $self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub { |
|
|
521 | delete $self->{_tw}; |
|
|
522 | $self->_timeout; |
|
|
523 | }); |
|
|
524 | } else { |
|
|
525 | delete $self->{_tw}; |
|
|
526 | } |
|
|
527 | } |
|
|
528 | |
258 | ############################################################################# |
529 | ############################################################################# |
259 | |
530 | |
260 | =back |
531 | =back |
261 | |
532 | |
262 | =head2 WRITE QUEUE |
533 | =head2 WRITE QUEUE |
… | |
… | |
283 | my ($self, $cb) = @_; |
554 | my ($self, $cb) = @_; |
284 | |
555 | |
285 | $self->{on_drain} = $cb; |
556 | $self->{on_drain} = $cb; |
286 | |
557 | |
287 | $cb->($self) |
558 | $cb->($self) |
288 | if $cb && $self->{low_water_mark} >= length $self->{wbuf}; |
559 | if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf}); |
289 | } |
560 | } |
290 | |
561 | |
291 | =item $handle->push_write ($data) |
562 | =item $handle->push_write ($data) |
292 | |
563 | |
293 | Queues the given scalar to be written. You can push as much data as you |
564 | Queues the given scalar to be written. You can push as much data as you |
… | |
… | |
297 | =cut |
568 | =cut |
298 | |
569 | |
299 | sub _drain_wbuf { |
570 | sub _drain_wbuf { |
300 | my ($self) = @_; |
571 | my ($self) = @_; |
301 | |
572 | |
302 | unless ($self->{ww}) { |
573 | if (!$self->{_ww} && length $self->{wbuf}) { |
|
|
574 | |
303 | Scalar::Util::weaken $self; |
575 | Scalar::Util::weaken $self; |
|
|
576 | |
304 | my $cb = sub { |
577 | my $cb = sub { |
305 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
578 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
306 | |
579 | |
307 | if ($len > 0) { |
580 | if ($len >= 0) { |
308 | substr $self->{wbuf}, 0, $len, ""; |
581 | substr $self->{wbuf}, 0, $len, ""; |
309 | |
582 | |
|
|
583 | $self->{_activity} = AnyEvent->now; |
|
|
584 | |
310 | $self->{on_drain}($self) |
585 | $self->{on_drain}($self) |
311 | if $self->{low_water_mark} >= length $self->{wbuf} |
586 | if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf}) |
312 | && $self->{on_drain}; |
587 | && $self->{on_drain}; |
313 | |
588 | |
314 | delete $self->{ww} unless length $self->{wbuf}; |
589 | delete $self->{_ww} unless length $self->{wbuf}; |
315 | } elsif ($! != EAGAIN && $! != EINTR) { |
590 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
316 | $self->error; |
591 | $self->_error ($!, 1); |
317 | } |
592 | } |
318 | }; |
593 | }; |
319 | |
594 | |
|
|
595 | # try to write data immediately |
|
|
596 | $cb->() unless $self->{autocork}; |
|
|
597 | |
|
|
598 | # if still data left in wbuf, we need to poll |
320 | $self->{ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb); |
599 | $self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb) |
321 | |
600 | if length $self->{wbuf}; |
322 | $cb->($self); |
|
|
323 | }; |
601 | }; |
|
|
602 | } |
|
|
603 | |
|
|
604 | our %WH; |
|
|
605 | |
|
|
606 | sub register_write_type($$) { |
|
|
607 | $WH{$_[0]} = $_[1]; |
324 | } |
608 | } |
325 | |
609 | |
326 | sub push_write { |
610 | sub push_write { |
327 | my $self = shift; |
611 | my $self = shift; |
328 | |
612 | |
|
|
613 | if (@_ > 1) { |
|
|
614 | my $type = shift; |
|
|
615 | |
|
|
616 | @_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write") |
|
|
617 | ->($self, @_); |
|
|
618 | } |
|
|
619 | |
329 | if ($self->{filter_w}) { |
620 | if ($self->{tls}) { |
330 | $self->{filter_w}->($self, \$_[0]); |
621 | $self->{_tls_wbuf} .= $_[0]; |
|
|
622 | |
|
|
623 | &_dotls ($self); |
331 | } else { |
624 | } else { |
332 | $self->{wbuf} .= $_[0]; |
625 | $self->{wbuf} .= $_[0]; |
333 | $self->_drain_wbuf; |
626 | $self->_drain_wbuf; |
334 | } |
627 | } |
335 | } |
628 | } |
336 | |
629 | |
|
|
630 | =item $handle->push_write (type => @args) |
|
|
631 | |
|
|
632 | Instead of formatting your data yourself, you can also let this module do |
|
|
633 | the job by specifying a type and type-specific arguments. |
|
|
634 | |
|
|
635 | Predefined types are (if you have ideas for additional types, feel free to |
|
|
636 | drop by and tell us): |
|
|
637 | |
|
|
638 | =over 4 |
|
|
639 | |
|
|
640 | =item netstring => $string |
|
|
641 | |
|
|
642 | Formats the given value as netstring |
|
|
643 | (http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them). |
|
|
644 | |
|
|
645 | =cut |
|
|
646 | |
|
|
647 | register_write_type netstring => sub { |
|
|
648 | my ($self, $string) = @_; |
|
|
649 | |
|
|
650 | (length $string) . ":$string," |
|
|
651 | }; |
|
|
652 | |
|
|
653 | =item packstring => $format, $data |
|
|
654 | |
|
|
655 | An octet string prefixed with an encoded length. The encoding C<$format> |
|
|
656 | uses the same format as a Perl C<pack> format, but must specify a single |
|
|
657 | integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an |
|
|
658 | optional C<!>, C<< < >> or C<< > >> modifier). |
|
|
659 | |
|
|
660 | =cut |
|
|
661 | |
|
|
662 | register_write_type packstring => sub { |
|
|
663 | my ($self, $format, $string) = @_; |
|
|
664 | |
|
|
665 | pack "$format/a*", $string |
|
|
666 | }; |
|
|
667 | |
|
|
668 | =item json => $array_or_hashref |
|
|
669 | |
|
|
670 | Encodes the given hash or array reference into a JSON object. Unless you |
|
|
671 | provide your own JSON object, this means it will be encoded to JSON text |
|
|
672 | in UTF-8. |
|
|
673 | |
|
|
674 | JSON objects (and arrays) are self-delimiting, so you can write JSON at |
|
|
675 | one end of a handle and read them at the other end without using any |
|
|
676 | additional framing. |
|
|
677 | |
|
|
678 | The generated JSON text is guaranteed not to contain any newlines: While |
|
|
679 | this module doesn't need delimiters after or between JSON texts to be |
|
|
680 | able to read them, many other languages depend on that. |
|
|
681 | |
|
|
682 | A simple RPC protocol that interoperates easily with others is to send |
|
|
683 | JSON arrays (or objects, although arrays are usually the better choice as |
|
|
684 | they mimic how function argument passing works) and a newline after each |
|
|
685 | JSON text: |
|
|
686 | |
|
|
687 | $handle->push_write (json => ["method", "arg1", "arg2"]); # whatever |
|
|
688 | $handle->push_write ("\012"); |
|
|
689 | |
|
|
690 | An AnyEvent::Handle receiver would simply use the C<json> read type and |
|
|
691 | rely on the fact that the newline will be skipped as leading whitespace: |
|
|
692 | |
|
|
693 | $handle->push_read (json => sub { my $array = $_[1]; ... }); |
|
|
694 | |
|
|
695 | Other languages could read single lines terminated by a newline and pass |
|
|
696 | this line into their JSON decoder of choice. |
|
|
697 | |
|
|
698 | =cut |
|
|
699 | |
|
|
700 | register_write_type json => sub { |
|
|
701 | my ($self, $ref) = @_; |
|
|
702 | |
|
|
703 | require JSON; |
|
|
704 | |
|
|
705 | $self->{json} ? $self->{json}->encode ($ref) |
|
|
706 | : JSON::encode_json ($ref) |
|
|
707 | }; |
|
|
708 | |
|
|
709 | =item storable => $reference |
|
|
710 | |
|
|
711 | Freezes the given reference using L<Storable> and writes it to the |
|
|
712 | handle. Uses the C<nfreeze> format. |
|
|
713 | |
|
|
714 | =cut |
|
|
715 | |
|
|
716 | register_write_type storable => sub { |
|
|
717 | my ($self, $ref) = @_; |
|
|
718 | |
|
|
719 | require Storable; |
|
|
720 | |
|
|
721 | pack "w/a*", Storable::nfreeze ($ref) |
|
|
722 | }; |
|
|
723 | |
|
|
724 | =back |
|
|
725 | |
|
|
726 | =item $handle->push_shutdown |
|
|
727 | |
|
|
728 | Sometimes you know you want to close the socket after writing your data |
|
|
729 | before it was actually written. One way to do that is to replace your |
|
|
730 | C<on_drain> handler by a callback that shuts down the socket (and set |
|
|
731 | C<low_water_mark> to C<0>). This method is a shorthand for just that, and |
|
|
732 | replaces the C<on_drain> callback with: |
|
|
733 | |
|
|
734 | sub { shutdown $_[0]{fh}, 1 } # for push_shutdown |
|
|
735 | |
|
|
736 | This simply shuts down the write side and signals an EOF condition to the |
|
|
737 | the peer. |
|
|
738 | |
|
|
739 | You can rely on the normal read queue and C<on_eof> handling |
|
|
740 | afterwards. This is the cleanest way to close a connection. |
|
|
741 | |
|
|
742 | =cut |
|
|
743 | |
|
|
744 | sub push_shutdown { |
|
|
745 | my ($self) = @_; |
|
|
746 | |
|
|
747 | delete $self->{low_water_mark}; |
|
|
748 | $self->on_drain (sub { shutdown $_[0]{fh}, 1 }); |
|
|
749 | } |
|
|
750 | |
|
|
751 | =item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args) |
|
|
752 | |
|
|
753 | This function (not method) lets you add your own types to C<push_write>. |
|
|
754 | Whenever the given C<type> is used, C<push_write> will invoke the code |
|
|
755 | reference with the handle object and the remaining arguments. |
|
|
756 | |
|
|
757 | The code reference is supposed to return a single octet string that will |
|
|
758 | be appended to the write buffer. |
|
|
759 | |
|
|
760 | Note that this is a function, and all types registered this way will be |
|
|
761 | global, so try to use unique names. |
|
|
762 | |
|
|
763 | =cut |
|
|
764 | |
337 | ############################################################################# |
765 | ############################################################################# |
338 | |
766 | |
339 | =back |
767 | =back |
340 | |
768 | |
341 | =head2 READ QUEUE |
769 | =head2 READ QUEUE |
… | |
… | |
347 | ways, the "simple" way, using only C<on_read> and the "complex" way, using |
775 | ways, the "simple" way, using only C<on_read> and the "complex" way, using |
348 | a queue. |
776 | a queue. |
349 | |
777 | |
350 | In the simple case, you just install an C<on_read> callback and whenever |
778 | In the simple case, you just install an C<on_read> callback and whenever |
351 | new data arrives, it will be called. You can then remove some data (if |
779 | new data arrives, it will be called. You can then remove some data (if |
352 | enough is there) from the read buffer (C<< $handle->rbuf >>) if you want |
780 | enough is there) from the read buffer (C<< $handle->rbuf >>). Or you cna |
353 | or not. |
781 | leave the data there if you want to accumulate more (e.g. when only a |
|
|
782 | partial message has been received so far). |
354 | |
783 | |
355 | In the more complex case, you want to queue multiple callbacks. In this |
784 | In the more complex case, you want to queue multiple callbacks. In this |
356 | case, AnyEvent::Handle will call the first queued callback each time new |
785 | case, AnyEvent::Handle will call the first queued callback each time new |
357 | data arrives and removes it when it has done its job (see C<push_read>, |
786 | data arrives (also the first time it is queued) and removes it when it has |
358 | below). |
787 | done its job (see C<push_read>, below). |
359 | |
788 | |
360 | This way you can, for example, push three line-reads, followed by reading |
789 | This way you can, for example, push three line-reads, followed by reading |
361 | a chunk of data, and AnyEvent::Handle will execute them in order. |
790 | a chunk of data, and AnyEvent::Handle will execute them in order. |
362 | |
791 | |
363 | Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by |
792 | Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by |
364 | the specified number of bytes which give an XML datagram. |
793 | the specified number of bytes which give an XML datagram. |
365 | |
794 | |
366 | # in the default state, expect some header bytes |
795 | # in the default state, expect some header bytes |
367 | $handle->on_read (sub { |
796 | $handle->on_read (sub { |
368 | # some data is here, now queue the length-header-read (4 octets) |
797 | # some data is here, now queue the length-header-read (4 octets) |
369 | shift->unshift_read_chunk (4, sub { |
798 | shift->unshift_read (chunk => 4, sub { |
370 | # header arrived, decode |
799 | # header arrived, decode |
371 | my $len = unpack "N", $_[1]; |
800 | my $len = unpack "N", $_[1]; |
372 | |
801 | |
373 | # now read the payload |
802 | # now read the payload |
374 | shift->unshift_read_chunk ($len, sub { |
803 | shift->unshift_read (chunk => $len, sub { |
375 | my $xml = $_[1]; |
804 | my $xml = $_[1]; |
376 | # handle xml |
805 | # handle xml |
377 | }); |
806 | }); |
378 | }); |
807 | }); |
379 | }); |
808 | }); |
380 | |
809 | |
381 | Example 2: Implement a client for a protocol that replies either with |
810 | Example 2: Implement a client for a protocol that replies either with "OK" |
382 | "OK" and another line or "ERROR" for one request, and 64 bytes for the |
811 | and another line or "ERROR" for the first request that is sent, and 64 |
383 | second request. Due tot he availability of a full queue, we can just |
812 | bytes for the second request. Due to the availability of a queue, we can |
384 | pipeline sending both requests and manipulate the queue as necessary in |
813 | just pipeline sending both requests and manipulate the queue as necessary |
385 | the callbacks: |
814 | in the callbacks. |
386 | |
815 | |
387 | # request one |
816 | When the first callback is called and sees an "OK" response, it will |
|
|
817 | C<unshift> another line-read. This line-read will be queued I<before> the |
|
|
818 | 64-byte chunk callback. |
|
|
819 | |
|
|
820 | # request one, returns either "OK + extra line" or "ERROR" |
388 | $handle->push_write ("request 1\015\012"); |
821 | $handle->push_write ("request 1\015\012"); |
389 | |
822 | |
390 | # we expect "ERROR" or "OK" as response, so push a line read |
823 | # we expect "ERROR" or "OK" as response, so push a line read |
391 | $handle->push_read_line (sub { |
824 | $handle->push_read (line => sub { |
392 | # if we got an "OK", we have to _prepend_ another line, |
825 | # if we got an "OK", we have to _prepend_ another line, |
393 | # so it will be read before the second request reads its 64 bytes |
826 | # so it will be read before the second request reads its 64 bytes |
394 | # which are already in the queue when this callback is called |
827 | # which are already in the queue when this callback is called |
395 | # we don't do this in case we got an error |
828 | # we don't do this in case we got an error |
396 | if ($_[1] eq "OK") { |
829 | if ($_[1] eq "OK") { |
397 | $_[0]->unshift_read_line (sub { |
830 | $_[0]->unshift_read (line => sub { |
398 | my $response = $_[1]; |
831 | my $response = $_[1]; |
399 | ... |
832 | ... |
400 | }); |
833 | }); |
401 | } |
834 | } |
402 | }); |
835 | }); |
403 | |
836 | |
404 | # request two |
837 | # request two, simply returns 64 octets |
405 | $handle->push_write ("request 2\015\012"); |
838 | $handle->push_write ("request 2\015\012"); |
406 | |
839 | |
407 | # simply read 64 bytes, always |
840 | # simply read 64 bytes, always |
408 | $handle->push_read_chunk (64, sub { |
841 | $handle->push_read (chunk => 64, sub { |
409 | my $response = $_[1]; |
842 | my $response = $_[1]; |
410 | ... |
843 | ... |
411 | }); |
844 | }); |
412 | |
845 | |
413 | =over 4 |
846 | =over 4 |
414 | |
847 | |
415 | =cut |
848 | =cut |
416 | |
849 | |
417 | sub _drain_rbuf { |
850 | sub _drain_rbuf { |
418 | my ($self) = @_; |
851 | my ($self) = @_; |
|
|
852 | |
|
|
853 | local $self->{_in_drain} = 1; |
419 | |
854 | |
420 | if ( |
855 | if ( |
421 | defined $self->{rbuf_max} |
856 | defined $self->{rbuf_max} |
422 | && $self->{rbuf_max} < length $self->{rbuf} |
857 | && $self->{rbuf_max} < length $self->{rbuf} |
423 | ) { |
858 | ) { |
424 | $! = &Errno::ENOSPC; return $self->error; |
859 | $self->_error (&Errno::ENOSPC, 1), return; |
425 | } |
860 | } |
426 | |
861 | |
427 | return if $self->{in_drain}; |
862 | while () { |
428 | local $self->{in_drain} = 1; |
863 | # we need to use a separate tls read buffer, as we must not receive data while |
|
|
864 | # we are draining the buffer, and this can only happen with TLS. |
|
|
865 | $self->{rbuf} .= delete $self->{_tls_rbuf} if exists $self->{_tls_rbuf}; |
429 | |
866 | |
430 | while (my $len = length $self->{rbuf}) { |
867 | my $len = length $self->{rbuf}; |
431 | no strict 'refs'; |
868 | |
432 | if (my $cb = shift @{ $self->{queue} }) { |
869 | if (my $cb = shift @{ $self->{_queue} }) { |
433 | if (!$cb->($self)) { |
870 | unless ($cb->($self)) { |
434 | if ($self->{eof}) { |
871 | if ($self->{_eof}) { |
435 | # no progress can be made (not enough data and no data forthcoming) |
872 | # no progress can be made (not enough data and no data forthcoming) |
436 | $! = &Errno::EPIPE; return $self->error; |
873 | $self->_error (&Errno::EPIPE, 1), return; |
437 | } |
874 | } |
438 | |
875 | |
439 | unshift @{ $self->{queue} }, $cb; |
876 | unshift @{ $self->{_queue} }, $cb; |
440 | return; |
877 | last; |
441 | } |
878 | } |
442 | } elsif ($self->{on_read}) { |
879 | } elsif ($self->{on_read}) { |
|
|
880 | last unless $len; |
|
|
881 | |
443 | $self->{on_read}($self); |
882 | $self->{on_read}($self); |
444 | |
883 | |
445 | if ( |
884 | if ( |
446 | $self->{eof} # if no further data will arrive |
|
|
447 | && $len == length $self->{rbuf} # and no data has been consumed |
885 | $len == length $self->{rbuf} # if no data has been consumed |
448 | && !@{ $self->{queue} } # and the queue is still empty |
886 | && !@{ $self->{_queue} } # and the queue is still empty |
449 | && $self->{on_read} # and we still want to read data |
887 | && $self->{on_read} # but we still have on_read |
450 | ) { |
888 | ) { |
|
|
889 | # no further data will arrive |
451 | # then no progress can be made |
890 | # so no progress can be made |
452 | $! = &Errno::EPIPE; return $self->error; |
891 | $self->_error (&Errno::EPIPE, 1), return |
|
|
892 | if $self->{_eof}; |
|
|
893 | |
|
|
894 | last; # more data might arrive |
453 | } |
895 | } |
454 | } else { |
896 | } else { |
455 | # read side becomes idle |
897 | # read side becomes idle |
456 | delete $self->{rw}; |
898 | delete $self->{_rw} unless $self->{tls}; |
457 | return; |
899 | last; |
458 | } |
900 | } |
459 | } |
901 | } |
460 | |
902 | |
461 | if ($self->{eof}) { |
903 | if ($self->{_eof}) { |
462 | $self->_shutdown; |
904 | if ($self->{on_eof}) { |
463 | $self->{on_eof}($self) |
905 | $self->{on_eof}($self) |
464 | if $self->{on_eof}; |
906 | } else { |
|
|
907 | $self->_error (0, 1, "Unexpected end-of-file"); |
|
|
908 | } |
|
|
909 | } |
|
|
910 | |
|
|
911 | # may need to restart read watcher |
|
|
912 | unless ($self->{_rw}) { |
|
|
913 | $self->start_read |
|
|
914 | if $self->{on_read} || @{ $self->{_queue} }; |
465 | } |
915 | } |
466 | } |
916 | } |
467 | |
917 | |
468 | =item $handle->on_read ($cb) |
918 | =item $handle->on_read ($cb) |
469 | |
919 | |
… | |
… | |
475 | |
925 | |
476 | sub on_read { |
926 | sub on_read { |
477 | my ($self, $cb) = @_; |
927 | my ($self, $cb) = @_; |
478 | |
928 | |
479 | $self->{on_read} = $cb; |
929 | $self->{on_read} = $cb; |
|
|
930 | $self->_drain_rbuf if $cb && !$self->{_in_drain}; |
480 | } |
931 | } |
481 | |
932 | |
482 | =item $handle->rbuf |
933 | =item $handle->rbuf |
483 | |
934 | |
484 | Returns the read buffer (as a modifiable lvalue). |
935 | Returns the read buffer (as a modifiable lvalue). |
485 | |
936 | |
486 | You can access the read buffer directly as the C<< ->{rbuf} >> member, if |
937 | You can access the read buffer directly as the C<< ->{rbuf} >> |
487 | you want. |
938 | member, if you want. However, the only operation allowed on the |
|
|
939 | read buffer (apart from looking at it) is removing data from its |
|
|
940 | beginning. Otherwise modifying or appending to it is not allowed and will |
|
|
941 | lead to hard-to-track-down bugs. |
488 | |
942 | |
489 | NOTE: The read buffer should only be used or modified if the C<on_read>, |
943 | NOTE: The read buffer should only be used or modified if the C<on_read>, |
490 | C<push_read> or C<unshift_read> methods are used. The other read methods |
944 | C<push_read> or C<unshift_read> methods are used. The other read methods |
491 | automatically manage the read buffer. |
945 | automatically manage the read buffer. |
492 | |
946 | |
… | |
… | |
515 | interested in (which can be none at all) and return a true value. After returning |
969 | interested in (which can be none at all) and return a true value. After returning |
516 | true, it will be removed from the queue. |
970 | true, it will be removed from the queue. |
517 | |
971 | |
518 | =cut |
972 | =cut |
519 | |
973 | |
|
|
974 | our %RH; |
|
|
975 | |
|
|
976 | sub register_read_type($$) { |
|
|
977 | $RH{$_[0]} = $_[1]; |
|
|
978 | } |
|
|
979 | |
520 | sub push_read { |
980 | sub push_read { |
521 | my $self = shift; |
981 | my $self = shift; |
522 | my $cb = pop; |
982 | my $cb = pop; |
523 | |
983 | |
524 | if (@_) { |
984 | if (@_) { |
… | |
… | |
526 | |
986 | |
527 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read") |
987 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read") |
528 | ->($self, $cb, @_); |
988 | ->($self, $cb, @_); |
529 | } |
989 | } |
530 | |
990 | |
531 | push @{ $self->{queue} }, $cb; |
991 | push @{ $self->{_queue} }, $cb; |
532 | $self->_drain_rbuf; |
992 | $self->_drain_rbuf unless $self->{_in_drain}; |
533 | } |
993 | } |
534 | |
994 | |
535 | sub unshift_read { |
995 | sub unshift_read { |
536 | my $self = shift; |
996 | my $self = shift; |
537 | my $cb = pop; |
997 | my $cb = pop; |
… | |
… | |
542 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read") |
1002 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read") |
543 | ->($self, $cb, @_); |
1003 | ->($self, $cb, @_); |
544 | } |
1004 | } |
545 | |
1005 | |
546 | |
1006 | |
547 | unshift @{ $self->{queue} }, $cb; |
1007 | unshift @{ $self->{_queue} }, $cb; |
548 | $self->_drain_rbuf; |
1008 | $self->_drain_rbuf unless $self->{_in_drain}; |
549 | } |
1009 | } |
550 | |
1010 | |
551 | =item $handle->push_read (type => @args, $cb) |
1011 | =item $handle->push_read (type => @args, $cb) |
552 | |
1012 | |
553 | =item $handle->unshift_read (type => @args, $cb) |
1013 | =item $handle->unshift_read (type => @args, $cb) |
554 | |
1014 | |
555 | Instead of providing a callback that parses the data itself you can chose |
1015 | 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 |
1016 | between a number of predefined parsing formats, for chunks of data, lines |
557 | etc. |
1017 | etc. |
558 | |
1018 | |
559 | The types currently supported are: |
1019 | Predefined types are (if you have ideas for additional types, feel free to |
|
|
1020 | drop by and tell us): |
560 | |
1021 | |
561 | =over 4 |
1022 | =over 4 |
562 | |
1023 | |
563 | =item chunk => $octets, $cb->($self, $data) |
1024 | =item chunk => $octets, $cb->($handle, $data) |
564 | |
1025 | |
565 | Invoke the callback only once C<$octets> bytes have been read. Pass the |
1026 | 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 |
1027 | data read to the callback. The callback will never be called with less |
567 | data. |
1028 | data. |
568 | |
1029 | |
… | |
… | |
582 | $cb->($_[0], substr $_[0]{rbuf}, 0, $len, ""); |
1043 | $cb->($_[0], substr $_[0]{rbuf}, 0, $len, ""); |
583 | 1 |
1044 | 1 |
584 | } |
1045 | } |
585 | }; |
1046 | }; |
586 | |
1047 | |
587 | # compatibility with older API |
|
|
588 | sub push_read_chunk { |
|
|
589 | $_[0]->push_read (chunk => $_[1], $_[2]); |
|
|
590 | } |
|
|
591 | |
|
|
592 | sub unshift_read_chunk { |
|
|
593 | $_[0]->unshift_read (chunk => $_[1], $_[2]); |
|
|
594 | } |
|
|
595 | |
|
|
596 | =item line => [$eol, ]$cb->($self, $line, $eol) |
1048 | =item line => [$eol, ]$cb->($handle, $line, $eol) |
597 | |
1049 | |
598 | The callback will be called only once a full line (including the end of |
1050 | The callback will be called only once a full line (including the end of |
599 | line marker, C<$eol>) has been read. This line (excluding the end of line |
1051 | 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 |
1052 | 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>). |
1053 | the end of line marker as the third argument (C<$eol>). |
… | |
… | |
615 | =cut |
1067 | =cut |
616 | |
1068 | |
617 | register_read_type line => sub { |
1069 | register_read_type line => sub { |
618 | my ($self, $cb, $eol) = @_; |
1070 | my ($self, $cb, $eol) = @_; |
619 | |
1071 | |
620 | $eol = qr|(\015?\012)| if @_ < 3; |
1072 | if (@_ < 3) { |
|
|
1073 | # this is more than twice as fast as the generic code below |
|
|
1074 | sub { |
|
|
1075 | $_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return; |
|
|
1076 | |
|
|
1077 | $cb->($_[0], $1, $2); |
|
|
1078 | 1 |
|
|
1079 | } |
|
|
1080 | } else { |
621 | $eol = quotemeta $eol unless ref $eol; |
1081 | $eol = quotemeta $eol unless ref $eol; |
622 | $eol = qr|^(.*?)($eol)|s; |
1082 | $eol = qr|^(.*?)($eol)|s; |
|
|
1083 | |
|
|
1084 | sub { |
|
|
1085 | $_[0]{rbuf} =~ s/$eol// or return; |
|
|
1086 | |
|
|
1087 | $cb->($_[0], $1, $2); |
|
|
1088 | 1 |
|
|
1089 | } |
|
|
1090 | } |
|
|
1091 | }; |
|
|
1092 | |
|
|
1093 | =item regex => $accept[, $reject[, $skip], $cb->($handle, $data) |
|
|
1094 | |
|
|
1095 | Makes a regex match against the regex object C<$accept> and returns |
|
|
1096 | everything up to and including the match. |
|
|
1097 | |
|
|
1098 | Example: read a single line terminated by '\n'. |
|
|
1099 | |
|
|
1100 | $handle->push_read (regex => qr<\n>, sub { ... }); |
|
|
1101 | |
|
|
1102 | If C<$reject> is given and not undef, then it determines when the data is |
|
|
1103 | to be rejected: it is matched against the data when the C<$accept> regex |
|
|
1104 | does not match and generates an C<EBADMSG> error when it matches. This is |
|
|
1105 | useful to quickly reject wrong data (to avoid waiting for a timeout or a |
|
|
1106 | receive buffer overflow). |
|
|
1107 | |
|
|
1108 | Example: expect a single decimal number followed by whitespace, reject |
|
|
1109 | anything else (not the use of an anchor). |
|
|
1110 | |
|
|
1111 | $handle->push_read (regex => qr<^[0-9]+\s>, qr<[^0-9]>, sub { ... }); |
|
|
1112 | |
|
|
1113 | If C<$skip> is given and not C<undef>, then it will be matched against |
|
|
1114 | the receive buffer when neither C<$accept> nor C<$reject> match, |
|
|
1115 | and everything preceding and including the match will be accepted |
|
|
1116 | unconditionally. This is useful to skip large amounts of data that you |
|
|
1117 | know cannot be matched, so that the C<$accept> or C<$reject> regex do not |
|
|
1118 | have to start matching from the beginning. This is purely an optimisation |
|
|
1119 | and is usually worth only when you expect more than a few kilobytes. |
|
|
1120 | |
|
|
1121 | Example: expect a http header, which ends at C<\015\012\015\012>. Since we |
|
|
1122 | expect the header to be very large (it isn't in practise, but...), we use |
|
|
1123 | a skip regex to skip initial portions. The skip regex is tricky in that |
|
|
1124 | it only accepts something not ending in either \015 or \012, as these are |
|
|
1125 | required for the accept regex. |
|
|
1126 | |
|
|
1127 | $handle->push_read (regex => |
|
|
1128 | qr<\015\012\015\012>, |
|
|
1129 | undef, # no reject |
|
|
1130 | qr<^.*[^\015\012]>, |
|
|
1131 | sub { ... }); |
|
|
1132 | |
|
|
1133 | =cut |
|
|
1134 | |
|
|
1135 | register_read_type regex => sub { |
|
|
1136 | my ($self, $cb, $accept, $reject, $skip) = @_; |
|
|
1137 | |
|
|
1138 | my $data; |
|
|
1139 | my $rbuf = \$self->{rbuf}; |
623 | |
1140 | |
624 | sub { |
1141 | sub { |
625 | $_[0]{rbuf} =~ s/$eol// or return; |
1142 | # accept |
|
|
1143 | if ($$rbuf =~ $accept) { |
|
|
1144 | $data .= substr $$rbuf, 0, $+[0], ""; |
|
|
1145 | $cb->($self, $data); |
|
|
1146 | return 1; |
|
|
1147 | } |
|
|
1148 | |
|
|
1149 | # reject |
|
|
1150 | if ($reject && $$rbuf =~ $reject) { |
|
|
1151 | $self->_error (&Errno::EBADMSG); |
|
|
1152 | } |
626 | |
1153 | |
627 | $cb->($_[0], $1, $2); |
1154 | # skip |
|
|
1155 | if ($skip && $$rbuf =~ $skip) { |
|
|
1156 | $data .= substr $$rbuf, 0, $+[0], ""; |
|
|
1157 | } |
|
|
1158 | |
|
|
1159 | () |
|
|
1160 | } |
|
|
1161 | }; |
|
|
1162 | |
|
|
1163 | =item netstring => $cb->($handle, $string) |
|
|
1164 | |
|
|
1165 | A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement). |
|
|
1166 | |
|
|
1167 | Throws an error with C<$!> set to EBADMSG on format violations. |
|
|
1168 | |
|
|
1169 | =cut |
|
|
1170 | |
|
|
1171 | register_read_type netstring => sub { |
|
|
1172 | my ($self, $cb) = @_; |
|
|
1173 | |
|
|
1174 | sub { |
|
|
1175 | unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) { |
|
|
1176 | if ($_[0]{rbuf} =~ /[^0-9]/) { |
|
|
1177 | $self->_error (&Errno::EBADMSG); |
|
|
1178 | } |
|
|
1179 | return; |
|
|
1180 | } |
|
|
1181 | |
|
|
1182 | my $len = $1; |
|
|
1183 | |
|
|
1184 | $self->unshift_read (chunk => $len, sub { |
|
|
1185 | my $string = $_[1]; |
|
|
1186 | $_[0]->unshift_read (chunk => 1, sub { |
|
|
1187 | if ($_[1] eq ",") { |
|
|
1188 | $cb->($_[0], $string); |
|
|
1189 | } else { |
|
|
1190 | $self->_error (&Errno::EBADMSG); |
|
|
1191 | } |
|
|
1192 | }); |
|
|
1193 | }); |
|
|
1194 | |
628 | 1 |
1195 | 1 |
629 | } |
1196 | } |
630 | }; |
1197 | }; |
631 | |
1198 | |
632 | # compatibility with older API |
1199 | =item packstring => $format, $cb->($handle, $string) |
633 | sub push_read_line { |
|
|
634 | my $self = shift; |
|
|
635 | $self->push_read (line => @_); |
|
|
636 | } |
|
|
637 | |
1200 | |
638 | sub unshift_read_line { |
1201 | An octet string prefixed with an encoded length. The encoding C<$format> |
639 | my $self = shift; |
1202 | uses the same format as a Perl C<pack> format, but must specify a single |
640 | $self->unshift_read (line => @_); |
1203 | integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an |
641 | } |
1204 | optional C<!>, C<< < >> or C<< > >> modifier). |
|
|
1205 | |
|
|
1206 | For example, DNS over TCP uses a prefix of C<n> (2 octet network order), |
|
|
1207 | EPP uses a prefix of C<N> (4 octtes). |
|
|
1208 | |
|
|
1209 | Example: read a block of data prefixed by its length in BER-encoded |
|
|
1210 | format (very efficient). |
|
|
1211 | |
|
|
1212 | $handle->push_read (packstring => "w", sub { |
|
|
1213 | my ($handle, $data) = @_; |
|
|
1214 | }); |
|
|
1215 | |
|
|
1216 | =cut |
|
|
1217 | |
|
|
1218 | register_read_type packstring => sub { |
|
|
1219 | my ($self, $cb, $format) = @_; |
|
|
1220 | |
|
|
1221 | sub { |
|
|
1222 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
|
|
1223 | defined (my $len = eval { unpack $format, $_[0]{rbuf} }) |
|
|
1224 | or return; |
|
|
1225 | |
|
|
1226 | $format = length pack $format, $len; |
|
|
1227 | |
|
|
1228 | # bypass unshift if we already have the remaining chunk |
|
|
1229 | if ($format + $len <= length $_[0]{rbuf}) { |
|
|
1230 | my $data = substr $_[0]{rbuf}, $format, $len; |
|
|
1231 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
|
|
1232 | $cb->($_[0], $data); |
|
|
1233 | } else { |
|
|
1234 | # remove prefix |
|
|
1235 | substr $_[0]{rbuf}, 0, $format, ""; |
|
|
1236 | |
|
|
1237 | # read remaining chunk |
|
|
1238 | $_[0]->unshift_read (chunk => $len, $cb); |
|
|
1239 | } |
|
|
1240 | |
|
|
1241 | 1 |
|
|
1242 | } |
|
|
1243 | }; |
|
|
1244 | |
|
|
1245 | =item json => $cb->($handle, $hash_or_arrayref) |
|
|
1246 | |
|
|
1247 | Reads a JSON object or array, decodes it and passes it to the |
|
|
1248 | callback. When a parse error occurs, an C<EBADMSG> error will be raised. |
|
|
1249 | |
|
|
1250 | If a C<json> object was passed to the constructor, then that will be used |
|
|
1251 | for the final decode, otherwise it will create a JSON coder expecting UTF-8. |
|
|
1252 | |
|
|
1253 | This read type uses the incremental parser available with JSON version |
|
|
1254 | 2.09 (and JSON::XS version 2.2) and above. You have to provide a |
|
|
1255 | dependency on your own: this module will load the JSON module, but |
|
|
1256 | AnyEvent does not depend on it itself. |
|
|
1257 | |
|
|
1258 | Since JSON texts are fully self-delimiting, the C<json> read and write |
|
|
1259 | types are an ideal simple RPC protocol: just exchange JSON datagrams. See |
|
|
1260 | the C<json> write type description, above, for an actual example. |
|
|
1261 | |
|
|
1262 | =cut |
|
|
1263 | |
|
|
1264 | register_read_type json => sub { |
|
|
1265 | my ($self, $cb) = @_; |
|
|
1266 | |
|
|
1267 | my $json = $self->{json} ||= |
|
|
1268 | eval { require JSON::XS; JSON::XS->new->utf8 } |
|
|
1269 | || do { require JSON; JSON->new->utf8 }; |
|
|
1270 | |
|
|
1271 | my $data; |
|
|
1272 | my $rbuf = \$self->{rbuf}; |
|
|
1273 | |
|
|
1274 | sub { |
|
|
1275 | my $ref = eval { $json->incr_parse ($self->{rbuf}) }; |
|
|
1276 | |
|
|
1277 | if ($ref) { |
|
|
1278 | $self->{rbuf} = $json->incr_text; |
|
|
1279 | $json->incr_text = ""; |
|
|
1280 | $cb->($self, $ref); |
|
|
1281 | |
|
|
1282 | 1 |
|
|
1283 | } elsif ($@) { |
|
|
1284 | # error case |
|
|
1285 | $json->incr_skip; |
|
|
1286 | |
|
|
1287 | $self->{rbuf} = $json->incr_text; |
|
|
1288 | $json->incr_text = ""; |
|
|
1289 | |
|
|
1290 | $self->_error (&Errno::EBADMSG); |
|
|
1291 | |
|
|
1292 | () |
|
|
1293 | } else { |
|
|
1294 | $self->{rbuf} = ""; |
|
|
1295 | |
|
|
1296 | () |
|
|
1297 | } |
|
|
1298 | } |
|
|
1299 | }; |
|
|
1300 | |
|
|
1301 | =item storable => $cb->($handle, $ref) |
|
|
1302 | |
|
|
1303 | Deserialises a L<Storable> frozen representation as written by the |
|
|
1304 | C<storable> write type (BER-encoded length prefix followed by nfreeze'd |
|
|
1305 | data). |
|
|
1306 | |
|
|
1307 | Raises C<EBADMSG> error if the data could not be decoded. |
|
|
1308 | |
|
|
1309 | =cut |
|
|
1310 | |
|
|
1311 | register_read_type storable => sub { |
|
|
1312 | my ($self, $cb) = @_; |
|
|
1313 | |
|
|
1314 | require Storable; |
|
|
1315 | |
|
|
1316 | sub { |
|
|
1317 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
|
|
1318 | defined (my $len = eval { unpack "w", $_[0]{rbuf} }) |
|
|
1319 | or return; |
|
|
1320 | |
|
|
1321 | my $format = length pack "w", $len; |
|
|
1322 | |
|
|
1323 | # bypass unshift if we already have the remaining chunk |
|
|
1324 | if ($format + $len <= length $_[0]{rbuf}) { |
|
|
1325 | my $data = substr $_[0]{rbuf}, $format, $len; |
|
|
1326 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
|
|
1327 | $cb->($_[0], Storable::thaw ($data)); |
|
|
1328 | } else { |
|
|
1329 | # remove prefix |
|
|
1330 | substr $_[0]{rbuf}, 0, $format, ""; |
|
|
1331 | |
|
|
1332 | # read remaining chunk |
|
|
1333 | $_[0]->unshift_read (chunk => $len, sub { |
|
|
1334 | if (my $ref = eval { Storable::thaw ($_[1]) }) { |
|
|
1335 | $cb->($_[0], $ref); |
|
|
1336 | } else { |
|
|
1337 | $self->_error (&Errno::EBADMSG); |
|
|
1338 | } |
|
|
1339 | }); |
|
|
1340 | } |
|
|
1341 | |
|
|
1342 | 1 |
|
|
1343 | } |
|
|
1344 | }; |
642 | |
1345 | |
643 | =back |
1346 | =back |
644 | |
1347 | |
|
|
1348 | =item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args) |
|
|
1349 | |
|
|
1350 | This function (not method) lets you add your own types to C<push_read>. |
|
|
1351 | |
|
|
1352 | Whenever the given C<type> is used, C<push_read> will invoke the code |
|
|
1353 | reference with the handle object, the callback and the remaining |
|
|
1354 | arguments. |
|
|
1355 | |
|
|
1356 | The code reference is supposed to return a callback (usually a closure) |
|
|
1357 | that works as a plain read callback (see C<< ->push_read ($cb) >>). |
|
|
1358 | |
|
|
1359 | It should invoke the passed callback when it is done reading (remember to |
|
|
1360 | pass C<$handle> as first argument as all other callbacks do that). |
|
|
1361 | |
|
|
1362 | Note that this is a function, and all types registered this way will be |
|
|
1363 | global, so try to use unique names. |
|
|
1364 | |
|
|
1365 | For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>, |
|
|
1366 | search for C<register_read_type>)). |
|
|
1367 | |
645 | =item $handle->stop_read |
1368 | =item $handle->stop_read |
646 | |
1369 | |
647 | =item $handle->start_read |
1370 | =item $handle->start_read |
648 | |
1371 | |
649 | In rare cases you actually do not want to read anything from the |
1372 | In rare cases you actually do not want to read anything from the |
650 | socket. In this case you can call C<stop_read>. Neither C<on_read> no |
1373 | socket. In this case you can call C<stop_read>. Neither C<on_read> nor |
651 | any queued callbacks will be executed then. To start reading again, call |
1374 | any queued callbacks will be executed then. To start reading again, call |
652 | C<start_read>. |
1375 | C<start_read>. |
653 | |
1376 | |
|
|
1377 | Note that AnyEvent::Handle will automatically C<start_read> for you when |
|
|
1378 | you change the C<on_read> callback or push/unshift a read callback, and it |
|
|
1379 | will automatically C<stop_read> for you when neither C<on_read> is set nor |
|
|
1380 | there are any read requests in the queue. |
|
|
1381 | |
|
|
1382 | These methods will have no effect when in TLS mode (as TLS doesn't support |
|
|
1383 | half-duplex connections). |
|
|
1384 | |
654 | =cut |
1385 | =cut |
655 | |
1386 | |
656 | sub stop_read { |
1387 | sub stop_read { |
657 | my ($self) = @_; |
1388 | my ($self) = @_; |
658 | |
1389 | |
659 | delete $self->{rw}; |
1390 | delete $self->{_rw} unless $self->{tls}; |
660 | } |
1391 | } |
661 | |
1392 | |
662 | sub start_read { |
1393 | sub start_read { |
663 | my ($self) = @_; |
1394 | my ($self) = @_; |
664 | |
1395 | |
665 | unless ($self->{rw} || $self->{eof}) { |
1396 | unless ($self->{_rw} || $self->{_eof}) { |
666 | Scalar::Util::weaken $self; |
1397 | Scalar::Util::weaken $self; |
667 | |
1398 | |
668 | $self->{rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
1399 | $self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
669 | my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf}; |
1400 | my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf}); |
670 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
1401 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
671 | |
1402 | |
672 | if ($len > 0) { |
1403 | if ($len > 0) { |
673 | $self->{filter_r} |
1404 | $self->{_activity} = AnyEvent->now; |
674 | ? $self->{filter_r}->($self, $rbuf) |
1405 | |
675 | : $self->_drain_rbuf; |
1406 | if ($self->{tls}) { |
|
|
1407 | Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf); |
|
|
1408 | |
|
|
1409 | &_dotls ($self); |
|
|
1410 | } else { |
|
|
1411 | $self->_drain_rbuf unless $self->{_in_drain}; |
|
|
1412 | } |
676 | |
1413 | |
677 | } elsif (defined $len) { |
1414 | } elsif (defined $len) { |
678 | delete $self->{rw}; |
1415 | delete $self->{_rw}; |
679 | $self->{eof} = 1; |
1416 | $self->{_eof} = 1; |
680 | $self->_drain_rbuf; |
1417 | $self->_drain_rbuf unless $self->{_in_drain}; |
681 | |
1418 | |
682 | } elsif ($! != EAGAIN && $! != EINTR) { |
1419 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
683 | return $self->error; |
1420 | return $self->_error ($!, 1); |
684 | } |
1421 | } |
685 | }); |
1422 | }); |
686 | } |
1423 | } |
687 | } |
1424 | } |
688 | |
1425 | |
|
|
1426 | our $ERROR_SYSCALL; |
|
|
1427 | our $ERROR_WANT_READ; |
|
|
1428 | |
|
|
1429 | sub _tls_error { |
|
|
1430 | my ($self, $err) = @_; |
|
|
1431 | |
|
|
1432 | return $self->_error ($!, 1) |
|
|
1433 | if $err == Net::SSLeay::ERROR_SYSCALL (); |
|
|
1434 | |
|
|
1435 | my $err =Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ()); |
|
|
1436 | |
|
|
1437 | # reduce error string to look less scary |
|
|
1438 | $err =~ s/^error:[0-9a-fA-F]{8}:[^:]+:([^:]+):/\L$1: /; |
|
|
1439 | |
|
|
1440 | $self->_error (&Errno::EPROTO, 1, $err); |
|
|
1441 | } |
|
|
1442 | |
|
|
1443 | # poll the write BIO and send the data if applicable |
|
|
1444 | # also decode read data if possible |
|
|
1445 | # this is basiclaly our TLS state machine |
|
|
1446 | # more efficient implementations are possible with openssl, |
|
|
1447 | # but not with the buggy and incomplete Net::SSLeay. |
689 | sub _dotls { |
1448 | sub _dotls { |
690 | my ($self) = @_; |
1449 | my ($self) = @_; |
691 | |
1450 | |
|
|
1451 | my $tmp; |
|
|
1452 | |
692 | if (length $self->{tls_wbuf}) { |
1453 | if (length $self->{_tls_wbuf}) { |
693 | while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{tls_wbuf})) > 0) { |
1454 | while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) { |
694 | substr $self->{tls_wbuf}, 0, $len, ""; |
1455 | substr $self->{_tls_wbuf}, 0, $tmp, ""; |
695 | } |
1456 | } |
696 | } |
|
|
697 | |
1457 | |
|
|
1458 | $tmp = Net::SSLeay::get_error ($self->{tls}, $tmp); |
|
|
1459 | return $self->_tls_error ($tmp) |
|
|
1460 | if $tmp != $ERROR_WANT_READ |
|
|
1461 | && ($tmp != $ERROR_SYSCALL || $!); |
|
|
1462 | } |
|
|
1463 | |
698 | if (defined (my $buf = Net::SSLeay::BIO_read ($self->{tls_wbio}))) { |
1464 | while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) { |
|
|
1465 | unless (length $tmp) { |
|
|
1466 | &_freetls; |
|
|
1467 | if ($self->{on_stoptls}) { |
|
|
1468 | $self->{on_stoptls}($self); |
|
|
1469 | return; |
|
|
1470 | } else { |
|
|
1471 | # let's treat SSL-eof as we treat normal EOF |
|
|
1472 | delete $self->{_rw}; |
|
|
1473 | $self->{_eof} = 1; |
|
|
1474 | } |
|
|
1475 | } |
|
|
1476 | |
|
|
1477 | $self->{_tls_rbuf} .= $tmp; |
|
|
1478 | $self->_drain_rbuf unless $self->{_in_drain}; |
|
|
1479 | $self->{tls} or return; # tls session might have gone away in callback |
|
|
1480 | } |
|
|
1481 | |
|
|
1482 | $tmp = Net::SSLeay::get_error ($self->{tls}, -1); |
|
|
1483 | return $self->_tls_error ($tmp) |
|
|
1484 | if $tmp != $ERROR_WANT_READ |
|
|
1485 | && ($tmp != $ERROR_SYSCALL || $!); |
|
|
1486 | |
|
|
1487 | while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
699 | $self->{wbuf} .= $buf; |
1488 | $self->{wbuf} .= $tmp; |
700 | $self->_drain_wbuf; |
1489 | $self->_drain_wbuf; |
701 | } |
1490 | } |
702 | |
1491 | |
703 | while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) { |
1492 | $self->{_on_starttls} |
704 | $self->{rbuf} .= $buf; |
1493 | and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK () |
705 | $self->_drain_rbuf; |
1494 | and (delete $self->{_on_starttls})->($self, 1); |
706 | } |
|
|
707 | |
|
|
708 | my $err = Net::SSLeay::get_error ($self->{tls}, -1); |
|
|
709 | |
|
|
710 | if ($err!= Net::SSLeay::ERROR_WANT_READ ()) { |
|
|
711 | if ($err == Net::SSLeay::ERROR_SYSCALL ()) { |
|
|
712 | $self->error; |
|
|
713 | } elsif ($err == Net::SSLeay::ERROR_SSL ()) { |
|
|
714 | $! = &Errno::EIO; |
|
|
715 | $self->error; |
|
|
716 | } |
|
|
717 | |
|
|
718 | # all others are fine for our purposes |
|
|
719 | } |
|
|
720 | } |
1495 | } |
721 | |
1496 | |
722 | =item $handle->starttls ($tls[, $tls_ctx]) |
1497 | =item $handle->starttls ($tls[, $tls_ctx]) |
723 | |
1498 | |
724 | Instead of starting TLS negotiation immediately when the AnyEvent::Handle |
1499 | Instead of starting TLS negotiation immediately when the AnyEvent::Handle |
… | |
… | |
726 | C<starttls>. |
1501 | C<starttls>. |
727 | |
1502 | |
728 | The first argument is the same as the C<tls> constructor argument (either |
1503 | The first argument is the same as the C<tls> constructor argument (either |
729 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
1504 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
730 | |
1505 | |
731 | The second argument is the optional C<Net::SSLeay::CTX> object that is |
1506 | The second argument is the optional C<AnyEvent::TLS> object that is used |
732 | used when AnyEvent::Handle has to create its own TLS connection object. |
1507 | when AnyEvent::Handle has to create its own TLS connection object, or |
|
|
1508 | a hash reference with C<< key => value >> pairs that will be used to |
|
|
1509 | construct a new context. |
733 | |
1510 | |
734 | =cut |
1511 | The TLS connection object will end up in C<< $handle->{tls} >>, the TLS |
|
|
1512 | context in C<< $handle->{tls_ctx} >> after this call and can be used or |
|
|
1513 | changed to your liking. Note that the handshake might have already started |
|
|
1514 | when this function returns. |
735 | |
1515 | |
736 | # TODO: maybe document... |
1516 | If it an error to start a TLS handshake more than once per |
|
|
1517 | AnyEvent::Handle object (this is due to bugs in OpenSSL). |
|
|
1518 | |
|
|
1519 | =cut |
|
|
1520 | |
|
|
1521 | our %TLS_CACHE; #TODO not yet documented, should we? |
|
|
1522 | |
737 | sub starttls { |
1523 | sub starttls { |
738 | my ($self, $ssl, $ctx) = @_; |
1524 | my ($self, $ssl, $ctx) = @_; |
739 | |
1525 | |
740 | $self->stoptls; |
1526 | require Net::SSLeay; |
741 | |
1527 | |
742 | if ($ssl eq "accept") { |
1528 | Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object" |
743 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
1529 | if $self->{tls}; |
744 | Net::SSLeay::set_accept_state ($ssl); |
1530 | |
745 | } elsif ($ssl eq "connect") { |
1531 | $ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL (); |
746 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
1532 | $ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ (); |
747 | Net::SSLeay::set_connect_state ($ssl); |
1533 | |
|
|
1534 | $ctx ||= $self->{tls_ctx}; |
|
|
1535 | |
|
|
1536 | if ("HASH" eq ref $ctx) { |
|
|
1537 | require AnyEvent::TLS; |
|
|
1538 | |
|
|
1539 | local $Carp::CarpLevel = 1; # skip ourselves when creating a new context |
|
|
1540 | |
|
|
1541 | if ($ctx->{cache}) { |
|
|
1542 | my $key = $ctx+0; |
|
|
1543 | $ctx = $TLS_CACHE{$key} ||= new AnyEvent::TLS %$ctx; |
|
|
1544 | } else { |
|
|
1545 | $ctx = new AnyEvent::TLS %$ctx; |
|
|
1546 | } |
|
|
1547 | } |
748 | } |
1548 | |
749 | |
1549 | $self->{tls_ctx} = $ctx || TLS_CTX (); |
750 | $self->{tls} = $ssl; |
1550 | $self->{tls} = $ssl = $self->{tls_ctx}->_get_session ($ssl, $self, $self->{peername}); |
751 | |
1551 | |
752 | # basically, this is deep magic (because SSL_read should have the same issues) |
1552 | # basically, this is deep magic (because SSL_read should have the same issues) |
753 | # but the openssl maintainers basically said: "trust us, it just works". |
1553 | # but the openssl maintainers basically said: "trust us, it just works". |
754 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
1554 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
755 | # and mismaintained ssleay-module doesn't even offer them). |
1555 | # and mismaintained ssleay-module doesn't even offer them). |
756 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
1556 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
|
|
1557 | # |
|
|
1558 | # in short: this is a mess. |
|
|
1559 | # |
|
|
1560 | # note that we do not try to keep the length constant between writes as we are required to do. |
|
|
1561 | # we assume that most (but not all) of this insanity only applies to non-blocking cases, |
|
|
1562 | # and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to |
|
|
1563 | # have identity issues in that area. |
757 | Net::SSLeay::CTX_set_mode ($self->{tls}, |
1564 | # Net::SSLeay::CTX_set_mode ($ssl, |
758 | (eval { Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
1565 | # (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
759 | | (eval { Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
1566 | # | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
|
|
1567 | Net::SSLeay::CTX_set_mode ($ssl, 1|2); |
760 | |
1568 | |
761 | $self->{tls_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1569 | $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
762 | $self->{tls_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1570 | $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
763 | |
1571 | |
764 | Net::SSLeay::set_bio ($ssl, $self->{tls_rbio}, $self->{tls_wbio}); |
1572 | Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio}); |
765 | |
1573 | |
766 | $self->{filter_w} = sub { |
1574 | $self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) } |
767 | $_[0]{tls_wbuf} .= ${$_[1]}; |
1575 | if exists $self->{on_starttls}; |
768 | &_dotls; |
1576 | |
769 | }; |
1577 | &_dotls; # need to trigger the initial handshake |
770 | $self->{filter_r} = sub { |
1578 | $self->start_read; # make sure we actually do read |
771 | Net::SSLeay::BIO_write ($_[0]{tls_rbio}, ${$_[1]}); |
|
|
772 | &_dotls; |
|
|
773 | }; |
|
|
774 | } |
1579 | } |
775 | |
1580 | |
776 | =item $handle->stoptls |
1581 | =item $handle->stoptls |
777 | |
1582 | |
778 | Destroys the SSL connection, if any. Partial read or write data will be |
1583 | Shuts down the SSL connection - this makes a proper EOF handshake by |
779 | lost. |
1584 | sending a close notify to the other side, but since OpenSSL doesn't |
|
|
1585 | support non-blocking shut downs, it is not possible to re-use the stream |
|
|
1586 | afterwards. |
780 | |
1587 | |
781 | =cut |
1588 | =cut |
782 | |
1589 | |
783 | sub stoptls { |
1590 | sub stoptls { |
784 | my ($self) = @_; |
1591 | my ($self) = @_; |
785 | |
1592 | |
786 | Net::SSLeay::free (delete $self->{tls}) if $self->{tls}; |
1593 | if ($self->{tls}) { |
787 | delete $self->{tls_rbio}; |
1594 | Net::SSLeay::shutdown ($self->{tls}); |
788 | delete $self->{tls_wbio}; |
1595 | |
789 | delete $self->{tls_wbuf}; |
1596 | &_dotls; |
790 | delete $self->{filter_r}; |
1597 | |
791 | delete $self->{filter_w}; |
1598 | # # we don't give a shit. no, we do, but we can't. no...#d# |
|
|
1599 | # # we, we... have to use openssl :/#d# |
|
|
1600 | # &_freetls;#d# |
|
|
1601 | } |
|
|
1602 | } |
|
|
1603 | |
|
|
1604 | sub _freetls { |
|
|
1605 | my ($self) = @_; |
|
|
1606 | |
|
|
1607 | return unless $self->{tls}; |
|
|
1608 | |
|
|
1609 | $self->{_on_starttls} |
|
|
1610 | and (delete $self->{_on_starttls})->($self, undef); |
|
|
1611 | |
|
|
1612 | $self->{tls_ctx}->_put_session (delete $self->{tls}); |
|
|
1613 | |
|
|
1614 | delete @$self{qw(_rbio _wbio _tls_wbuf)}; |
792 | } |
1615 | } |
793 | |
1616 | |
794 | sub DESTROY { |
1617 | sub DESTROY { |
795 | my $self = shift; |
1618 | my ($self) = @_; |
796 | |
1619 | |
797 | $self->stoptls; |
1620 | &_freetls; |
|
|
1621 | |
|
|
1622 | my $linger = exists $self->{linger} ? $self->{linger} : 3600; |
|
|
1623 | |
|
|
1624 | if ($linger && length $self->{wbuf}) { |
|
|
1625 | my $fh = delete $self->{fh}; |
|
|
1626 | my $wbuf = delete $self->{wbuf}; |
|
|
1627 | |
|
|
1628 | my @linger; |
|
|
1629 | |
|
|
1630 | push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub { |
|
|
1631 | my $len = syswrite $fh, $wbuf, length $wbuf; |
|
|
1632 | |
|
|
1633 | if ($len > 0) { |
|
|
1634 | substr $wbuf, 0, $len, ""; |
|
|
1635 | } else { |
|
|
1636 | @linger = (); # end |
|
|
1637 | } |
|
|
1638 | }); |
|
|
1639 | push @linger, AnyEvent->timer (after => $linger, cb => sub { |
|
|
1640 | @linger = (); |
|
|
1641 | }); |
|
|
1642 | } |
|
|
1643 | } |
|
|
1644 | |
|
|
1645 | =item $handle->destroy |
|
|
1646 | |
|
|
1647 | Shuts down the handle object as much as possible - this call ensures that |
|
|
1648 | no further callbacks will be invoked and as many resources as possible |
|
|
1649 | will be freed. You must not call any methods on the object afterwards. |
|
|
1650 | |
|
|
1651 | Normally, you can just "forget" any references to an AnyEvent::Handle |
|
|
1652 | object and it will simply shut down. This works in fatal error and EOF |
|
|
1653 | callbacks, as well as code outside. It does I<NOT> work in a read or write |
|
|
1654 | callback, so when you want to destroy the AnyEvent::Handle object from |
|
|
1655 | within such an callback. You I<MUST> call C<< ->destroy >> explicitly in |
|
|
1656 | that case. |
|
|
1657 | |
|
|
1658 | The handle might still linger in the background and write out remaining |
|
|
1659 | data, as specified by the C<linger> option, however. |
|
|
1660 | |
|
|
1661 | =cut |
|
|
1662 | |
|
|
1663 | sub destroy { |
|
|
1664 | my ($self) = @_; |
|
|
1665 | |
|
|
1666 | $self->DESTROY; |
|
|
1667 | %$self = (); |
798 | } |
1668 | } |
799 | |
1669 | |
800 | =item AnyEvent::Handle::TLS_CTX |
1670 | =item AnyEvent::Handle::TLS_CTX |
801 | |
1671 | |
802 | This function creates and returns the Net::SSLeay::CTX object used by |
1672 | This function creates and returns the AnyEvent::TLS object used by default |
803 | default for TLS mode. |
1673 | for TLS mode. |
804 | |
1674 | |
805 | The context is created like this: |
1675 | The context is created by calling L<AnyEvent::TLS> without any arguments. |
806 | |
|
|
807 | Net::SSLeay::load_error_strings; |
|
|
808 | Net::SSLeay::SSLeay_add_ssl_algorithms; |
|
|
809 | Net::SSLeay::randomize; |
|
|
810 | |
|
|
811 | my $CTX = Net::SSLeay::CTX_new; |
|
|
812 | |
|
|
813 | Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL |
|
|
814 | |
1676 | |
815 | =cut |
1677 | =cut |
816 | |
1678 | |
817 | our $TLS_CTX; |
1679 | our $TLS_CTX; |
818 | |
1680 | |
819 | sub TLS_CTX() { |
1681 | sub TLS_CTX() { |
820 | $TLS_CTX || do { |
1682 | $TLS_CTX ||= do { |
821 | require Net::SSLeay; |
1683 | require AnyEvent::TLS; |
822 | |
1684 | |
823 | Net::SSLeay::load_error_strings (); |
1685 | new AnyEvent::TLS |
824 | Net::SSLeay::SSLeay_add_ssl_algorithms (); |
|
|
825 | Net::SSLeay::randomize (); |
|
|
826 | |
|
|
827 | $TLS_CTX = Net::SSLeay::CTX_new (); |
|
|
828 | |
|
|
829 | Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ()); |
|
|
830 | |
|
|
831 | $TLS_CTX |
|
|
832 | } |
1686 | } |
833 | } |
1687 | } |
834 | |
1688 | |
835 | =back |
1689 | =back |
836 | |
1690 | |
|
|
1691 | |
|
|
1692 | =head1 NONFREQUENTLY ASKED QUESTIONS |
|
|
1693 | |
|
|
1694 | =over 4 |
|
|
1695 | |
|
|
1696 | =item I C<undef> the AnyEvent::Handle reference inside my callback and |
|
|
1697 | still get further invocations! |
|
|
1698 | |
|
|
1699 | That's because AnyEvent::Handle keeps a reference to itself when handling |
|
|
1700 | read or write callbacks. |
|
|
1701 | |
|
|
1702 | It is only safe to "forget" the reference inside EOF or error callbacks, |
|
|
1703 | from within all other callbacks, you need to explicitly call the C<< |
|
|
1704 | ->destroy >> method. |
|
|
1705 | |
|
|
1706 | =item I get different callback invocations in TLS mode/Why can't I pause |
|
|
1707 | reading? |
|
|
1708 | |
|
|
1709 | Unlike, say, TCP, TLS connections do not consist of two independent |
|
|
1710 | communication channels, one for each direction. Or put differently. The |
|
|
1711 | read and write directions are not independent of each other: you cannot |
|
|
1712 | write data unless you are also prepared to read, and vice versa. |
|
|
1713 | |
|
|
1714 | This can mean than, in TLS mode, you might get C<on_error> or C<on_eof> |
|
|
1715 | callback invocations when you are not expecting any read data - the reason |
|
|
1716 | is that AnyEvent::Handle always reads in TLS mode. |
|
|
1717 | |
|
|
1718 | During the connection, you have to make sure that you always have a |
|
|
1719 | non-empty read-queue, or an C<on_read> watcher. At the end of the |
|
|
1720 | connection (or when you no longer want to use it) you can call the |
|
|
1721 | C<destroy> method. |
|
|
1722 | |
|
|
1723 | =item How do I read data until the other side closes the connection? |
|
|
1724 | |
|
|
1725 | If you just want to read your data into a perl scalar, the easiest way |
|
|
1726 | to achieve this is by setting an C<on_read> callback that does nothing, |
|
|
1727 | clearing the C<on_eof> callback and in the C<on_error> callback, the data |
|
|
1728 | will be in C<$_[0]{rbuf}>: |
|
|
1729 | |
|
|
1730 | $handle->on_read (sub { }); |
|
|
1731 | $handle->on_eof (undef); |
|
|
1732 | $handle->on_error (sub { |
|
|
1733 | my $data = delete $_[0]{rbuf}; |
|
|
1734 | undef $handle; |
|
|
1735 | }); |
|
|
1736 | |
|
|
1737 | The reason to use C<on_error> is that TCP connections, due to latencies |
|
|
1738 | and packets loss, might get closed quite violently with an error, when in |
|
|
1739 | fact, all data has been received. |
|
|
1740 | |
|
|
1741 | It is usually better to use acknowledgements when transferring data, |
|
|
1742 | to make sure the other side hasn't just died and you got the data |
|
|
1743 | intact. This is also one reason why so many internet protocols have an |
|
|
1744 | explicit QUIT command. |
|
|
1745 | |
|
|
1746 | =item I don't want to destroy the handle too early - how do I wait until |
|
|
1747 | all data has been written? |
|
|
1748 | |
|
|
1749 | After writing your last bits of data, set the C<on_drain> callback |
|
|
1750 | and destroy the handle in there - with the default setting of |
|
|
1751 | C<low_water_mark> this will be called precisely when all data has been |
|
|
1752 | written to the socket: |
|
|
1753 | |
|
|
1754 | $handle->push_write (...); |
|
|
1755 | $handle->on_drain (sub { |
|
|
1756 | warn "all data submitted to the kernel\n"; |
|
|
1757 | undef $handle; |
|
|
1758 | }); |
|
|
1759 | |
|
|
1760 | =back |
|
|
1761 | |
|
|
1762 | |
|
|
1763 | =head1 SUBCLASSING AnyEvent::Handle |
|
|
1764 | |
|
|
1765 | In many cases, you might want to subclass AnyEvent::Handle. |
|
|
1766 | |
|
|
1767 | To make this easier, a given version of AnyEvent::Handle uses these |
|
|
1768 | conventions: |
|
|
1769 | |
|
|
1770 | =over 4 |
|
|
1771 | |
|
|
1772 | =item * all constructor arguments become object members. |
|
|
1773 | |
|
|
1774 | At least initially, when you pass a C<tls>-argument to the constructor it |
|
|
1775 | will end up in C<< $handle->{tls} >>. Those members might be changed or |
|
|
1776 | mutated later on (for example C<tls> will hold the TLS connection object). |
|
|
1777 | |
|
|
1778 | =item * other object member names are prefixed with an C<_>. |
|
|
1779 | |
|
|
1780 | All object members not explicitly documented (internal use) are prefixed |
|
|
1781 | with an underscore character, so the remaining non-C<_>-namespace is free |
|
|
1782 | for use for subclasses. |
|
|
1783 | |
|
|
1784 | =item * all members not documented here and not prefixed with an underscore |
|
|
1785 | are free to use in subclasses. |
|
|
1786 | |
|
|
1787 | Of course, new versions of AnyEvent::Handle may introduce more "public" |
|
|
1788 | member variables, but thats just life, at least it is documented. |
|
|
1789 | |
|
|
1790 | =back |
|
|
1791 | |
837 | =head1 AUTHOR |
1792 | =head1 AUTHOR |
838 | |
1793 | |
839 | Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>. |
1794 | Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>. |
840 | |
1795 | |
841 | =cut |
1796 | =cut |