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 = 4.33; |
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->broadcast; |
41 | }, |
33 | }, |
42 | #TODO |
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43 | ); |
34 | ); |
44 | |
35 | |
45 | $cv->wait; |
36 | # send some request line |
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37 | $handle->push_write ("getinfo\015\012"); |
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38 | |
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39 | # read the response line |
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40 | $handle->push_read (line => sub { |
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41 | my ($handle, $line) = @_; |
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42 | warn "read line <$line>\n"; |
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43 | $cv->send; |
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44 | }); |
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45 | |
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46 | $cv->recv; |
46 | |
47 | |
47 | =head1 DESCRIPTION |
48 | =head1 DESCRIPTION |
48 | |
49 | |
49 | This module is a helper module to make it easier to do event-based I/O on |
50 | This module is a helper module to make it easier to do event-based I/O on |
50 | filehandles. For utility functions for doing non-blocking connects and accepts |
51 | filehandles. For utility functions for doing non-blocking connects and accepts |
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 |
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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 | |
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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>. |
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99 | |
85 | =item on_error => $cb->($self) |
100 | =item on_error => $cb->($handle, $fatal) |
86 | |
101 | |
87 | This is the fatal error callback, that is called when, well, a fatal error |
102 | This is the error callback, which is called when, well, some error |
88 | occurs, such as not being able to resolve the hostname, failure to connect |
103 | occured, such as not being able to resolve the hostname, failure to |
89 | or a read error. |
104 | connect or a read error. |
90 | |
105 | |
91 | The object will not be in a usable state when this callback has been |
106 | Some errors are fatal (which is indicated by C<$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 | Non-fatal errors can be retried by simply returning, but it is recommended |
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113 | to simply ignore this parameter and instead abondon the handle object |
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114 | when this callback is invoked. Examples of non-fatal errors are timeouts |
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115 | C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>). |
93 | |
116 | |
94 | On callback entrance, the value of C<$!> contains the operating system |
117 | On callback entrance, the value of C<$!> contains the operating system |
95 | error (or C<ENOSPC> or C<EPIPE>). |
118 | error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>). |
96 | |
119 | |
97 | While not mandatory, it is I<highly> recommended to set this callback, as |
120 | While not mandatory, it is I<highly> recommended to set this callback, as |
98 | you will not be notified of errors otherwise. The default simply calls |
121 | you will not be notified of errors otherwise. The default simply calls |
99 | die. |
122 | C<croak>. |
100 | |
123 | |
101 | =item on_read => $cb->($self) |
124 | =item on_read => $cb->($handle) |
102 | |
125 | |
103 | This sets the default read callback, which is called when data arrives |
126 | This sets the default read callback, which is called when data arrives |
104 | and no read request is in the queue. |
127 | and no read request is in the queue (unlike read queue callbacks, this |
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128 | callback will only be called when at least one octet of data is in the |
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129 | read buffer). |
105 | |
130 | |
106 | To access (and remove data from) the read buffer, use the C<< ->rbuf >> |
131 | To access (and remove data from) the read buffer, use the C<< ->rbuf >> |
107 | method or access the C<$self->{rbuf}> member directly. |
132 | method or access the C<$handle->{rbuf}> member directly. |
108 | |
133 | |
109 | When an EOF condition is detected then AnyEvent::Handle will first try to |
134 | 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 |
135 | 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 |
136 | calling the C<on_eof> callback. If no progress can be made, then a fatal |
112 | error will be raised (with C<$!> set to C<EPIPE>). |
137 | error will be raised (with C<$!> set to C<EPIPE>). |
113 | |
138 | |
114 | =item on_drain => $cb->() |
139 | =item on_drain => $cb->($handle) |
115 | |
140 | |
116 | This sets the callback that is called when the write buffer becomes empty |
141 | 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). |
142 | (or when the callback is set and the buffer is empty already). |
118 | |
143 | |
119 | To append to the write buffer, use the C<< ->push_write >> method. |
144 | To append to the write buffer, use the C<< ->push_write >> method. |
120 | |
145 | |
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146 | This callback is useful when you don't want to put all of your write data |
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147 | into the queue at once, for example, when you want to write the contents |
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148 | of some file to the socket you might not want to read the whole file into |
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149 | memory and push it into the queue, but instead only read more data from |
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150 | the file when the write queue becomes empty. |
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151 | |
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152 | =item timeout => $fractional_seconds |
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153 | |
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154 | If non-zero, then this enables an "inactivity" timeout: whenever this many |
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155 | seconds pass without a successful read or write on the underlying file |
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156 | handle, the C<on_timeout> callback will be invoked (and if that one is |
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157 | missing, a non-fatal C<ETIMEDOUT> error will be raised). |
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158 | |
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159 | Note that timeout processing is also active when you currently do not have |
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160 | any outstanding read or write requests: If you plan to keep the connection |
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161 | idle then you should disable the timout temporarily or ignore the timeout |
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162 | in the C<on_timeout> callback, in which case AnyEvent::Handle will simply |
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163 | restart the timeout. |
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164 | |
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165 | Zero (the default) disables this timeout. |
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166 | |
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167 | =item on_timeout => $cb->($handle) |
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168 | |
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169 | Called whenever the inactivity timeout passes. If you return from this |
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170 | callback, then the timeout will be reset as if some activity had happened, |
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171 | so this condition is not fatal in any way. |
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172 | |
121 | =item rbuf_max => <bytes> |
173 | =item rbuf_max => <bytes> |
122 | |
174 | |
123 | If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
175 | If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
124 | when the read buffer ever (strictly) exceeds this size. This is useful to |
176 | when the read buffer ever (strictly) exceeds this size. This is useful to |
125 | avoid denial-of-service attacks. |
177 | avoid some forms of denial-of-service attacks. |
126 | |
178 | |
127 | For example, a server accepting connections from untrusted sources should |
179 | 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 |
180 | 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 |
181 | (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 |
182 | amount of data without a callback ever being called as long as the line |
131 | isn't finished). |
183 | isn't finished). |
132 | |
184 | |
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185 | =item autocork => <boolean> |
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186 | |
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187 | When disabled (the default), then C<push_write> will try to immediately |
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188 | write the data to the handle, if possible. This avoids having to register |
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189 | a write watcher and wait for the next event loop iteration, but can |
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190 | be inefficient if you write multiple small chunks (on the wire, this |
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191 | disadvantage is usually avoided by your kernel's nagle algorithm, see |
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192 | C<no_delay>, but this option can save costly syscalls). |
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193 | |
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194 | When enabled, then writes will always be queued till the next event loop |
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195 | iteration. This is efficient when you do many small writes per iteration, |
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196 | but less efficient when you do a single write only per iteration (or when |
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197 | the write buffer often is full). It also increases write latency. |
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198 | |
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199 | =item no_delay => <boolean> |
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200 | |
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201 | When doing small writes on sockets, your operating system kernel might |
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202 | wait a bit for more data before actually sending it out. This is called |
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203 | the Nagle algorithm, and usually it is beneficial. |
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204 | |
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205 | In some situations you want as low a delay as possible, which can be |
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206 | accomplishd by setting this option to a true value. |
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207 | |
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208 | The default is your opertaing system's default behaviour (most likely |
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209 | enabled), this option explicitly enables or disables it, if possible. |
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210 | |
133 | =item read_size => <bytes> |
211 | =item read_size => <bytes> |
134 | |
212 | |
135 | The default read block size (the amount of bytes this module will try to read |
213 | The default read block size (the amount of bytes this module will |
136 | on each [loop iteration). Default: C<4096>. |
214 | try to read during each loop iteration, which affects memory |
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215 | requirements). Default: C<8192>. |
137 | |
216 | |
138 | =item low_water_mark => <bytes> |
217 | =item low_water_mark => <bytes> |
139 | |
218 | |
140 | Sets the amount of bytes (default: C<0>) that make up an "empty" write |
219 | Sets the amount of bytes (default: C<0>) that make up an "empty" write |
141 | buffer: If the write reaches this size or gets even samller it is |
220 | buffer: If the write reaches this size or gets even samller it is |
142 | considered empty. |
221 | considered empty. |
143 | |
222 | |
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223 | Sometimes it can be beneficial (for performance reasons) to add data to |
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224 | the write buffer before it is fully drained, but this is a rare case, as |
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225 | the operating system kernel usually buffers data as well, so the default |
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226 | is good in almost all cases. |
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227 | |
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228 | =item linger => <seconds> |
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229 | |
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230 | If non-zero (default: C<3600>), then the destructor of the |
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231 | AnyEvent::Handle object will check whether there is still outstanding |
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232 | write data and will install a watcher that will write this data to the |
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233 | socket. No errors will be reported (this mostly matches how the operating |
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234 | system treats outstanding data at socket close time). |
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235 | |
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236 | This will not work for partial TLS data that could not be encoded |
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237 | yet. This data will be lost. Calling the C<stoptls> method in time might |
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238 | help. |
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239 | |
144 | =item tls => "accept" | "connect" | Net::SSLeay::SSL object |
240 | =item tls => "accept" | "connect" | Net::SSLeay::SSL object |
145 | |
241 | |
146 | When this parameter is given, it enables TLS (SSL) mode, that means it |
242 | When this parameter is given, it enables TLS (SSL) mode, that means |
147 | will start making tls handshake and will transparently encrypt/decrypt |
243 | AnyEvent will start a TLS handshake as soon as the conenction has been |
148 | data. |
244 | established and will transparently encrypt/decrypt data afterwards. |
149 | |
245 | |
150 | For the TLS server side, use C<accept>, and for the TLS client side of a |
246 | TLS mode requires Net::SSLeay to be installed (it will be loaded |
151 | connection, use C<connect> mode. |
247 | automatically when you try to create a TLS handle): this module doesn't |
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248 | have a dependency on that module, so if your module requires it, you have |
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249 | to add the dependency yourself. |
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250 | |
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251 | Unlike TCP, TLS has a server and client side: for the TLS server side, use |
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252 | C<accept>, and for the TLS client side of a connection, use C<connect> |
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253 | mode. |
152 | |
254 | |
153 | You can also provide your own TLS connection object, but you have |
255 | You can also provide your own TLS connection object, but you have |
154 | to make sure that you call either C<Net::SSLeay::set_connect_state> |
256 | to make sure that you call either C<Net::SSLeay::set_connect_state> |
155 | or C<Net::SSLeay::set_accept_state> on it before you pass it to |
257 | or C<Net::SSLeay::set_accept_state> on it before you pass it to |
156 | AnyEvent::Handle. |
258 | AnyEvent::Handle. |
157 | |
259 | |
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260 | See the C<< ->starttls >> method for when need to start TLS negotiation later. |
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261 | |
158 | =item tls_ctx => $ssl_ctx |
262 | =item tls_ctx => $ssl_ctx |
159 | |
263 | |
160 | Use the given Net::SSLeay::CTX object to create the new TLS connection |
264 | Use the given C<Net::SSLeay::CTX> object to create the new TLS connection |
161 | (unless a connection object was specified directly). If this parameter is |
265 | (unless a connection object was specified directly). If this parameter is |
162 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
266 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
163 | |
267 | |
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268 | =item json => JSON or JSON::XS object |
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269 | |
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270 | This is the json coder object used by the C<json> read and write types. |
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271 | |
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272 | If you don't supply it, then AnyEvent::Handle will create and use a |
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273 | suitable one (on demand), which will write and expect UTF-8 encoded JSON |
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274 | texts. |
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275 | |
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276 | Note that you are responsible to depend on the JSON module if you want to |
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277 | use this functionality, as AnyEvent does not have a dependency itself. |
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278 | |
164 | =back |
279 | =back |
165 | |
280 | |
166 | =cut |
281 | =cut |
167 | |
282 | |
168 | sub new { |
283 | sub new { |
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172 | |
287 | |
173 | $self->{fh} or Carp::croak "mandatory argument fh is missing"; |
288 | $self->{fh} or Carp::croak "mandatory argument fh is missing"; |
174 | |
289 | |
175 | AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
290 | AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
176 | |
291 | |
177 | if ($self->{tls}) { |
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178 | require Net::SSLeay; |
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179 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}); |
292 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}) |
180 | } |
293 | if $self->{tls}; |
181 | |
294 | |
182 | $self->on_eof (delete $self->{on_eof} ) if $self->{on_eof}; |
295 | $self->{_activity} = AnyEvent->now; |
183 | $self->on_error (delete $self->{on_error}) if $self->{on_error}; |
296 | $self->_timeout; |
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297 | |
184 | $self->on_drain (delete $self->{on_drain}) if $self->{on_drain}; |
298 | $self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain}; |
185 | $self->on_read (delete $self->{on_read} ) if $self->{on_read}; |
299 | $self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay}; |
186 | |
300 | |
187 | $self->start_read; |
301 | $self->start_read |
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302 | if $self->{on_read}; |
188 | |
303 | |
189 | $self |
304 | $self |
190 | } |
305 | } |
191 | |
306 | |
192 | sub _shutdown { |
307 | sub _shutdown { |
193 | my ($self) = @_; |
308 | my ($self) = @_; |
194 | |
309 | |
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310 | delete $self->{_tw}; |
195 | delete $self->{rw}; |
311 | delete $self->{_rw}; |
196 | delete $self->{ww}; |
312 | delete $self->{_ww}; |
197 | delete $self->{fh}; |
313 | delete $self->{fh}; |
198 | } |
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199 | |
314 | |
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315 | &_freetls; |
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316 | |
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317 | delete $self->{on_read}; |
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318 | delete $self->{_queue}; |
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319 | } |
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320 | |
200 | sub error { |
321 | sub _error { |
201 | my ($self) = @_; |
322 | my ($self, $errno, $fatal) = @_; |
202 | |
323 | |
203 | { |
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204 | local $!; |
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205 | $self->_shutdown; |
324 | $self->_shutdown |
206 | } |
325 | if $fatal; |
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326 | |
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327 | $! = $errno; |
207 | |
328 | |
208 | if ($self->{on_error}) { |
329 | if ($self->{on_error}) { |
209 | $self->{on_error}($self); |
330 | $self->{on_error}($self, $fatal); |
210 | } else { |
331 | } elsif ($self->{fh}) { |
211 | die "AnyEvent::Handle uncaught fatal error: $!"; |
332 | Carp::croak "AnyEvent::Handle uncaught error: $!"; |
212 | } |
333 | } |
213 | } |
334 | } |
214 | |
335 | |
215 | =item $fh = $handle->fh |
336 | =item $fh = $handle->fh |
216 | |
337 | |
217 | This method returns the file handle of the L<AnyEvent::Handle> object. |
338 | This method returns the file handle used to create the L<AnyEvent::Handle> object. |
218 | |
339 | |
219 | =cut |
340 | =cut |
220 | |
341 | |
221 | sub fh { $_[0]->{fh} } |
342 | sub fh { $_[0]{fh} } |
222 | |
343 | |
223 | =item $handle->on_error ($cb) |
344 | =item $handle->on_error ($cb) |
224 | |
345 | |
225 | Replace the current C<on_error> callback (see the C<on_error> constructor argument). |
346 | Replace the current C<on_error> callback (see the C<on_error> constructor argument). |
226 | |
347 | |
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238 | |
359 | |
239 | sub on_eof { |
360 | sub on_eof { |
240 | $_[0]{on_eof} = $_[1]; |
361 | $_[0]{on_eof} = $_[1]; |
241 | } |
362 | } |
242 | |
363 | |
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364 | =item $handle->on_timeout ($cb) |
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365 | |
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366 | Replace the current C<on_timeout> callback, or disables the callback (but |
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367 | not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor |
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368 | argument and method. |
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369 | |
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370 | =cut |
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371 | |
|
|
372 | sub on_timeout { |
|
|
373 | $_[0]{on_timeout} = $_[1]; |
|
|
374 | } |
|
|
375 | |
|
|
376 | =item $handle->autocork ($boolean) |
|
|
377 | |
|
|
378 | Enables or disables the current autocork behaviour (see C<autocork> |
|
|
379 | constructor argument). Changes will only take effect on the next write. |
|
|
380 | |
|
|
381 | =cut |
|
|
382 | |
|
|
383 | sub autocork { |
|
|
384 | $_[0]{autocork} = $_[1]; |
|
|
385 | } |
|
|
386 | |
|
|
387 | =item $handle->no_delay ($boolean) |
|
|
388 | |
|
|
389 | Enables or disables the C<no_delay> setting (see constructor argument of |
|
|
390 | the same name for details). |
|
|
391 | |
|
|
392 | =cut |
|
|
393 | |
|
|
394 | sub no_delay { |
|
|
395 | $_[0]{no_delay} = $_[1]; |
|
|
396 | |
|
|
397 | eval { |
|
|
398 | local $SIG{__DIE__}; |
|
|
399 | setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1]; |
|
|
400 | }; |
|
|
401 | } |
|
|
402 | |
|
|
403 | ############################################################################# |
|
|
404 | |
|
|
405 | =item $handle->timeout ($seconds) |
|
|
406 | |
|
|
407 | Configures (or disables) the inactivity timeout. |
|
|
408 | |
|
|
409 | =cut |
|
|
410 | |
|
|
411 | sub timeout { |
|
|
412 | my ($self, $timeout) = @_; |
|
|
413 | |
|
|
414 | $self->{timeout} = $timeout; |
|
|
415 | $self->_timeout; |
|
|
416 | } |
|
|
417 | |
|
|
418 | # reset the timeout watcher, as neccessary |
|
|
419 | # also check for time-outs |
|
|
420 | sub _timeout { |
|
|
421 | my ($self) = @_; |
|
|
422 | |
|
|
423 | if ($self->{timeout}) { |
|
|
424 | my $NOW = AnyEvent->now; |
|
|
425 | |
|
|
426 | # when would the timeout trigger? |
|
|
427 | my $after = $self->{_activity} + $self->{timeout} - $NOW; |
|
|
428 | |
|
|
429 | # now or in the past already? |
|
|
430 | if ($after <= 0) { |
|
|
431 | $self->{_activity} = $NOW; |
|
|
432 | |
|
|
433 | if ($self->{on_timeout}) { |
|
|
434 | $self->{on_timeout}($self); |
|
|
435 | } else { |
|
|
436 | $self->_error (&Errno::ETIMEDOUT); |
|
|
437 | } |
|
|
438 | |
|
|
439 | # callback could have changed timeout value, optimise |
|
|
440 | return unless $self->{timeout}; |
|
|
441 | |
|
|
442 | # calculate new after |
|
|
443 | $after = $self->{timeout}; |
|
|
444 | } |
|
|
445 | |
|
|
446 | Scalar::Util::weaken $self; |
|
|
447 | return unless $self; # ->error could have destroyed $self |
|
|
448 | |
|
|
449 | $self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub { |
|
|
450 | delete $self->{_tw}; |
|
|
451 | $self->_timeout; |
|
|
452 | }); |
|
|
453 | } else { |
|
|
454 | delete $self->{_tw}; |
|
|
455 | } |
|
|
456 | } |
|
|
457 | |
243 | ############################################################################# |
458 | ############################################################################# |
244 | |
459 | |
245 | =back |
460 | =back |
246 | |
461 | |
247 | =head2 WRITE QUEUE |
462 | =head2 WRITE QUEUE |
… | |
… | |
268 | my ($self, $cb) = @_; |
483 | my ($self, $cb) = @_; |
269 | |
484 | |
270 | $self->{on_drain} = $cb; |
485 | $self->{on_drain} = $cb; |
271 | |
486 | |
272 | $cb->($self) |
487 | $cb->($self) |
273 | if $cb && $self->{low_water_mark} >= length $self->{wbuf}; |
488 | if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf}); |
274 | } |
489 | } |
275 | |
490 | |
276 | =item $handle->push_write ($data) |
491 | =item $handle->push_write ($data) |
277 | |
492 | |
278 | Queues the given scalar to be written. You can push as much data as you |
493 | Queues the given scalar to be written. You can push as much data as you |
… | |
… | |
282 | =cut |
497 | =cut |
283 | |
498 | |
284 | sub _drain_wbuf { |
499 | sub _drain_wbuf { |
285 | my ($self) = @_; |
500 | my ($self) = @_; |
286 | |
501 | |
287 | unless ($self->{ww}) { |
502 | if (!$self->{_ww} && length $self->{wbuf}) { |
|
|
503 | |
288 | Scalar::Util::weaken $self; |
504 | Scalar::Util::weaken $self; |
|
|
505 | |
289 | my $cb = sub { |
506 | my $cb = sub { |
290 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
507 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
291 | |
508 | |
292 | if ($len > 0) { |
509 | if ($len >= 0) { |
293 | substr $self->{wbuf}, 0, $len, ""; |
510 | substr $self->{wbuf}, 0, $len, ""; |
294 | |
511 | |
|
|
512 | $self->{_activity} = AnyEvent->now; |
|
|
513 | |
295 | $self->{on_drain}($self) |
514 | $self->{on_drain}($self) |
296 | if $self->{low_water_mark} >= length $self->{wbuf} |
515 | if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf}) |
297 | && $self->{on_drain}; |
516 | && $self->{on_drain}; |
298 | |
517 | |
299 | delete $self->{ww} unless length $self->{wbuf}; |
518 | delete $self->{_ww} unless length $self->{wbuf}; |
300 | } elsif ($! != EAGAIN && $! != EINTR) { |
519 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
301 | $self->error; |
520 | $self->_error ($!, 1); |
302 | } |
521 | } |
303 | }; |
522 | }; |
304 | |
523 | |
|
|
524 | # try to write data immediately |
|
|
525 | $cb->() unless $self->{autocork}; |
|
|
526 | |
|
|
527 | # if still data left in wbuf, we need to poll |
305 | $self->{ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb); |
528 | $self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb) |
306 | |
529 | if length $self->{wbuf}; |
307 | $cb->($self); |
|
|
308 | }; |
530 | }; |
|
|
531 | } |
|
|
532 | |
|
|
533 | our %WH; |
|
|
534 | |
|
|
535 | sub register_write_type($$) { |
|
|
536 | $WH{$_[0]} = $_[1]; |
309 | } |
537 | } |
310 | |
538 | |
311 | sub push_write { |
539 | sub push_write { |
312 | my $self = shift; |
540 | my $self = shift; |
313 | |
541 | |
|
|
542 | if (@_ > 1) { |
|
|
543 | my $type = shift; |
|
|
544 | |
|
|
545 | @_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write") |
|
|
546 | ->($self, @_); |
|
|
547 | } |
|
|
548 | |
314 | if ($self->{filter_w}) { |
549 | if ($self->{tls}) { |
315 | $self->{filter_w}->($self, \$_[0]); |
550 | $self->{_tls_wbuf} .= $_[0]; |
|
|
551 | |
|
|
552 | &_dotls ($self); |
316 | } else { |
553 | } else { |
317 | $self->{wbuf} .= $_[0]; |
554 | $self->{wbuf} .= $_[0]; |
318 | $self->_drain_wbuf; |
555 | $self->_drain_wbuf; |
319 | } |
556 | } |
320 | } |
557 | } |
321 | |
558 | |
|
|
559 | =item $handle->push_write (type => @args) |
|
|
560 | |
|
|
561 | Instead of formatting your data yourself, you can also let this module do |
|
|
562 | the job by specifying a type and type-specific arguments. |
|
|
563 | |
|
|
564 | Predefined types are (if you have ideas for additional types, feel free to |
|
|
565 | drop by and tell us): |
|
|
566 | |
|
|
567 | =over 4 |
|
|
568 | |
|
|
569 | =item netstring => $string |
|
|
570 | |
|
|
571 | Formats the given value as netstring |
|
|
572 | (http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them). |
|
|
573 | |
|
|
574 | =cut |
|
|
575 | |
|
|
576 | register_write_type netstring => sub { |
|
|
577 | my ($self, $string) = @_; |
|
|
578 | |
|
|
579 | (length $string) . ":$string," |
|
|
580 | }; |
|
|
581 | |
|
|
582 | =item packstring => $format, $data |
|
|
583 | |
|
|
584 | An octet string prefixed with an encoded length. The encoding C<$format> |
|
|
585 | uses the same format as a Perl C<pack> format, but must specify a single |
|
|
586 | integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an |
|
|
587 | optional C<!>, C<< < >> or C<< > >> modifier). |
|
|
588 | |
|
|
589 | =cut |
|
|
590 | |
|
|
591 | register_write_type packstring => sub { |
|
|
592 | my ($self, $format, $string) = @_; |
|
|
593 | |
|
|
594 | pack "$format/a*", $string |
|
|
595 | }; |
|
|
596 | |
|
|
597 | =item json => $array_or_hashref |
|
|
598 | |
|
|
599 | Encodes the given hash or array reference into a JSON object. Unless you |
|
|
600 | provide your own JSON object, this means it will be encoded to JSON text |
|
|
601 | in UTF-8. |
|
|
602 | |
|
|
603 | JSON objects (and arrays) are self-delimiting, so you can write JSON at |
|
|
604 | one end of a handle and read them at the other end without using any |
|
|
605 | additional framing. |
|
|
606 | |
|
|
607 | The generated JSON text is guaranteed not to contain any newlines: While |
|
|
608 | this module doesn't need delimiters after or between JSON texts to be |
|
|
609 | able to read them, many other languages depend on that. |
|
|
610 | |
|
|
611 | A simple RPC protocol that interoperates easily with others is to send |
|
|
612 | JSON arrays (or objects, although arrays are usually the better choice as |
|
|
613 | they mimic how function argument passing works) and a newline after each |
|
|
614 | JSON text: |
|
|
615 | |
|
|
616 | $handle->push_write (json => ["method", "arg1", "arg2"]); # whatever |
|
|
617 | $handle->push_write ("\012"); |
|
|
618 | |
|
|
619 | An AnyEvent::Handle receiver would simply use the C<json> read type and |
|
|
620 | rely on the fact that the newline will be skipped as leading whitespace: |
|
|
621 | |
|
|
622 | $handle->push_read (json => sub { my $array = $_[1]; ... }); |
|
|
623 | |
|
|
624 | Other languages could read single lines terminated by a newline and pass |
|
|
625 | this line into their JSON decoder of choice. |
|
|
626 | |
|
|
627 | =cut |
|
|
628 | |
|
|
629 | register_write_type json => sub { |
|
|
630 | my ($self, $ref) = @_; |
|
|
631 | |
|
|
632 | require JSON; |
|
|
633 | |
|
|
634 | $self->{json} ? $self->{json}->encode ($ref) |
|
|
635 | : JSON::encode_json ($ref) |
|
|
636 | }; |
|
|
637 | |
|
|
638 | =item storable => $reference |
|
|
639 | |
|
|
640 | Freezes the given reference using L<Storable> and writes it to the |
|
|
641 | handle. Uses the C<nfreeze> format. |
|
|
642 | |
|
|
643 | =cut |
|
|
644 | |
|
|
645 | register_write_type storable => sub { |
|
|
646 | my ($self, $ref) = @_; |
|
|
647 | |
|
|
648 | require Storable; |
|
|
649 | |
|
|
650 | pack "w/a*", Storable::nfreeze ($ref) |
|
|
651 | }; |
|
|
652 | |
|
|
653 | =back |
|
|
654 | |
|
|
655 | =item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args) |
|
|
656 | |
|
|
657 | This function (not method) lets you add your own types to C<push_write>. |
|
|
658 | Whenever the given C<type> is used, C<push_write> will invoke the code |
|
|
659 | reference with the handle object and the remaining arguments. |
|
|
660 | |
|
|
661 | The code reference is supposed to return a single octet string that will |
|
|
662 | be appended to the write buffer. |
|
|
663 | |
|
|
664 | Note that this is a function, and all types registered this way will be |
|
|
665 | global, so try to use unique names. |
|
|
666 | |
|
|
667 | =cut |
|
|
668 | |
322 | ############################################################################# |
669 | ############################################################################# |
323 | |
670 | |
324 | =back |
671 | =back |
325 | |
672 | |
326 | =head2 READ QUEUE |
673 | =head2 READ QUEUE |
… | |
… | |
332 | ways, the "simple" way, using only C<on_read> and the "complex" way, using |
679 | ways, the "simple" way, using only C<on_read> and the "complex" way, using |
333 | a queue. |
680 | a queue. |
334 | |
681 | |
335 | In the simple case, you just install an C<on_read> callback and whenever |
682 | In the simple case, you just install an C<on_read> callback and whenever |
336 | new data arrives, it will be called. You can then remove some data (if |
683 | new data arrives, it will be called. You can then remove some data (if |
337 | enough is there) from the read buffer (C<< $handle->rbuf >>) if you want |
684 | enough is there) from the read buffer (C<< $handle->rbuf >>). Or you cna |
338 | or not. |
685 | leave the data there if you want to accumulate more (e.g. when only a |
|
|
686 | partial message has been received so far). |
339 | |
687 | |
340 | In the more complex case, you want to queue multiple callbacks. In this |
688 | In the more complex case, you want to queue multiple callbacks. In this |
341 | case, AnyEvent::Handle will call the first queued callback each time new |
689 | case, AnyEvent::Handle will call the first queued callback each time new |
342 | data arrives and removes it when it has done its job (see C<push_read>, |
690 | data arrives (also the first time it is queued) and removes it when it has |
343 | below). |
691 | done its job (see C<push_read>, below). |
344 | |
692 | |
345 | This way you can, for example, push three line-reads, followed by reading |
693 | This way you can, for example, push three line-reads, followed by reading |
346 | a chunk of data, and AnyEvent::Handle will execute them in order. |
694 | a chunk of data, and AnyEvent::Handle will execute them in order. |
347 | |
695 | |
348 | Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by |
696 | Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by |
349 | the specified number of bytes which give an XML datagram. |
697 | the specified number of bytes which give an XML datagram. |
350 | |
698 | |
351 | # in the default state, expect some header bytes |
699 | # in the default state, expect some header bytes |
352 | $handle->on_read (sub { |
700 | $handle->on_read (sub { |
353 | # some data is here, now queue the length-header-read (4 octets) |
701 | # some data is here, now queue the length-header-read (4 octets) |
354 | shift->unshift_read_chunk (4, sub { |
702 | shift->unshift_read (chunk => 4, sub { |
355 | # header arrived, decode |
703 | # header arrived, decode |
356 | my $len = unpack "N", $_[1]; |
704 | my $len = unpack "N", $_[1]; |
357 | |
705 | |
358 | # now read the payload |
706 | # now read the payload |
359 | shift->unshift_read_chunk ($len, sub { |
707 | shift->unshift_read (chunk => $len, sub { |
360 | my $xml = $_[1]; |
708 | my $xml = $_[1]; |
361 | # handle xml |
709 | # handle xml |
362 | }); |
710 | }); |
363 | }); |
711 | }); |
364 | }); |
712 | }); |
365 | |
713 | |
366 | Example 2: Implement a client for a protocol that replies either with |
714 | Example 2: Implement a client for a protocol that replies either with "OK" |
367 | "OK" and another line or "ERROR" for one request, and 64 bytes for the |
715 | and another line or "ERROR" for the first request that is sent, and 64 |
368 | second request. Due tot he availability of a full queue, we can just |
716 | bytes for the second request. Due to the availability of a queue, we can |
369 | pipeline sending both requests and manipulate the queue as necessary in |
717 | just pipeline sending both requests and manipulate the queue as necessary |
370 | the callbacks: |
718 | in the callbacks. |
371 | |
719 | |
372 | # request one |
720 | When the first callback is called and sees an "OK" response, it will |
|
|
721 | C<unshift> another line-read. This line-read will be queued I<before> the |
|
|
722 | 64-byte chunk callback. |
|
|
723 | |
|
|
724 | # request one, returns either "OK + extra line" or "ERROR" |
373 | $handle->push_write ("request 1\015\012"); |
725 | $handle->push_write ("request 1\015\012"); |
374 | |
726 | |
375 | # we expect "ERROR" or "OK" as response, so push a line read |
727 | # we expect "ERROR" or "OK" as response, so push a line read |
376 | $handle->push_read_line (sub { |
728 | $handle->push_read (line => sub { |
377 | # if we got an "OK", we have to _prepend_ another line, |
729 | # if we got an "OK", we have to _prepend_ another line, |
378 | # so it will be read before the second request reads its 64 bytes |
730 | # so it will be read before the second request reads its 64 bytes |
379 | # which are already in the queue when this callback is called |
731 | # which are already in the queue when this callback is called |
380 | # we don't do this in case we got an error |
732 | # we don't do this in case we got an error |
381 | if ($_[1] eq "OK") { |
733 | if ($_[1] eq "OK") { |
382 | $_[0]->unshift_read_line (sub { |
734 | $_[0]->unshift_read (line => sub { |
383 | my $response = $_[1]; |
735 | my $response = $_[1]; |
384 | ... |
736 | ... |
385 | }); |
737 | }); |
386 | } |
738 | } |
387 | }); |
739 | }); |
388 | |
740 | |
389 | # request two |
741 | # request two, simply returns 64 octets |
390 | $handle->push_write ("request 2\015\012"); |
742 | $handle->push_write ("request 2\015\012"); |
391 | |
743 | |
392 | # simply read 64 bytes, always |
744 | # simply read 64 bytes, always |
393 | $handle->push_read_chunk (64, sub { |
745 | $handle->push_read (chunk => 64, sub { |
394 | my $response = $_[1]; |
746 | my $response = $_[1]; |
395 | ... |
747 | ... |
396 | }); |
748 | }); |
397 | |
749 | |
398 | =over 4 |
750 | =over 4 |
399 | |
751 | |
400 | =cut |
752 | =cut |
401 | |
753 | |
402 | sub _drain_rbuf { |
754 | sub _drain_rbuf { |
403 | my ($self) = @_; |
755 | my ($self) = @_; |
|
|
756 | |
|
|
757 | local $self->{_in_drain} = 1; |
404 | |
758 | |
405 | if ( |
759 | if ( |
406 | defined $self->{rbuf_max} |
760 | defined $self->{rbuf_max} |
407 | && $self->{rbuf_max} < length $self->{rbuf} |
761 | && $self->{rbuf_max} < length $self->{rbuf} |
408 | ) { |
762 | ) { |
409 | $! = &Errno::ENOSPC; return $self->error; |
763 | $self->_error (&Errno::ENOSPC, 1), return; |
410 | } |
764 | } |
411 | |
765 | |
412 | return if $self->{in_drain}; |
766 | while () { |
413 | local $self->{in_drain} = 1; |
|
|
414 | |
|
|
415 | while (my $len = length $self->{rbuf}) { |
767 | my $len = length $self->{rbuf}; |
416 | no strict 'refs'; |
768 | |
417 | if (my $cb = shift @{ $self->{queue} }) { |
769 | if (my $cb = shift @{ $self->{_queue} }) { |
418 | if (!$cb->($self)) { |
770 | unless ($cb->($self)) { |
419 | if ($self->{eof}) { |
771 | if ($self->{_eof}) { |
420 | # no progress can be made (not enough data and no data forthcoming) |
772 | # no progress can be made (not enough data and no data forthcoming) |
421 | $! = &Errno::EPIPE; return $self->error; |
773 | $self->_error (&Errno::EPIPE, 1), return; |
422 | } |
774 | } |
423 | |
775 | |
424 | unshift @{ $self->{queue} }, $cb; |
776 | unshift @{ $self->{_queue} }, $cb; |
425 | return; |
777 | last; |
426 | } |
778 | } |
427 | } elsif ($self->{on_read}) { |
779 | } elsif ($self->{on_read}) { |
|
|
780 | last unless $len; |
|
|
781 | |
428 | $self->{on_read}($self); |
782 | $self->{on_read}($self); |
429 | |
783 | |
430 | if ( |
784 | if ( |
431 | $self->{eof} # if no further data will arrive |
|
|
432 | && $len == length $self->{rbuf} # and no data has been consumed |
785 | $len == length $self->{rbuf} # if no data has been consumed |
433 | && !@{ $self->{queue} } # and the queue is still empty |
786 | && !@{ $self->{_queue} } # and the queue is still empty |
434 | && $self->{on_read} # and we still want to read data |
787 | && $self->{on_read} # but we still have on_read |
435 | ) { |
788 | ) { |
|
|
789 | # no further data will arrive |
436 | # then no progress can be made |
790 | # so no progress can be made |
437 | $! = &Errno::EPIPE; return $self->error; |
791 | $self->_error (&Errno::EPIPE, 1), return |
|
|
792 | if $self->{_eof}; |
|
|
793 | |
|
|
794 | last; # more data might arrive |
438 | } |
795 | } |
439 | } else { |
796 | } else { |
440 | # read side becomes idle |
797 | # read side becomes idle |
441 | delete $self->{rw}; |
798 | delete $self->{_rw} unless $self->{tls}; |
442 | return; |
799 | last; |
443 | } |
800 | } |
444 | } |
801 | } |
445 | |
802 | |
446 | if ($self->{eof}) { |
803 | if ($self->{_eof}) { |
447 | $self->_shutdown; |
804 | if ($self->{on_eof}) { |
448 | $self->{on_eof}($self) |
805 | $self->{on_eof}($self) |
449 | if $self->{on_eof}; |
806 | } else { |
|
|
807 | $self->_error (0, 1); |
|
|
808 | } |
|
|
809 | } |
|
|
810 | |
|
|
811 | # may need to restart read watcher |
|
|
812 | unless ($self->{_rw}) { |
|
|
813 | $self->start_read |
|
|
814 | if $self->{on_read} || @{ $self->{_queue} }; |
450 | } |
815 | } |
451 | } |
816 | } |
452 | |
817 | |
453 | =item $handle->on_read ($cb) |
818 | =item $handle->on_read ($cb) |
454 | |
819 | |
… | |
… | |
460 | |
825 | |
461 | sub on_read { |
826 | sub on_read { |
462 | my ($self, $cb) = @_; |
827 | my ($self, $cb) = @_; |
463 | |
828 | |
464 | $self->{on_read} = $cb; |
829 | $self->{on_read} = $cb; |
|
|
830 | $self->_drain_rbuf if $cb && !$self->{_in_drain}; |
465 | } |
831 | } |
466 | |
832 | |
467 | =item $handle->rbuf |
833 | =item $handle->rbuf |
468 | |
834 | |
469 | Returns the read buffer (as a modifiable lvalue). |
835 | Returns the read buffer (as a modifiable lvalue). |
… | |
… | |
500 | interested in (which can be none at all) and return a true value. After returning |
866 | interested in (which can be none at all) and return a true value. After returning |
501 | true, it will be removed from the queue. |
867 | true, it will be removed from the queue. |
502 | |
868 | |
503 | =cut |
869 | =cut |
504 | |
870 | |
|
|
871 | our %RH; |
|
|
872 | |
|
|
873 | sub register_read_type($$) { |
|
|
874 | $RH{$_[0]} = $_[1]; |
|
|
875 | } |
|
|
876 | |
505 | sub push_read { |
877 | sub push_read { |
506 | my ($self, $cb) = @_; |
878 | my $self = shift; |
|
|
879 | my $cb = pop; |
507 | |
880 | |
|
|
881 | if (@_) { |
|
|
882 | my $type = shift; |
|
|
883 | |
|
|
884 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read") |
|
|
885 | ->($self, $cb, @_); |
|
|
886 | } |
|
|
887 | |
508 | push @{ $self->{queue} }, $cb; |
888 | push @{ $self->{_queue} }, $cb; |
509 | $self->_drain_rbuf; |
889 | $self->_drain_rbuf unless $self->{_in_drain}; |
510 | } |
890 | } |
511 | |
891 | |
512 | sub unshift_read { |
892 | sub unshift_read { |
513 | my ($self, $cb) = @_; |
893 | my $self = shift; |
|
|
894 | my $cb = pop; |
514 | |
895 | |
|
|
896 | if (@_) { |
|
|
897 | my $type = shift; |
|
|
898 | |
|
|
899 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read") |
|
|
900 | ->($self, $cb, @_); |
|
|
901 | } |
|
|
902 | |
|
|
903 | |
515 | push @{ $self->{queue} }, $cb; |
904 | unshift @{ $self->{_queue} }, $cb; |
516 | $self->_drain_rbuf; |
905 | $self->_drain_rbuf unless $self->{_in_drain}; |
517 | } |
906 | } |
518 | |
907 | |
519 | =item $handle->push_read_chunk ($len, $cb->($self, $data)) |
908 | =item $handle->push_read (type => @args, $cb) |
520 | |
909 | |
521 | =item $handle->unshift_read_chunk ($len, $cb->($self, $data)) |
910 | =item $handle->unshift_read (type => @args, $cb) |
522 | |
911 | |
523 | Append the given callback to the end of the queue (C<push_read_chunk>) or |
912 | Instead of providing a callback that parses the data itself you can chose |
524 | prepend it (C<unshift_read_chunk>). |
913 | between a number of predefined parsing formats, for chunks of data, lines |
|
|
914 | etc. |
525 | |
915 | |
526 | The callback will be called only once C<$len> bytes have been read, and |
916 | Predefined types are (if you have ideas for additional types, feel free to |
527 | these C<$len> bytes will be passed to the callback. |
917 | drop by and tell us): |
528 | |
918 | |
529 | =cut |
919 | =over 4 |
530 | |
920 | |
531 | sub _read_chunk($$) { |
921 | =item chunk => $octets, $cb->($handle, $data) |
|
|
922 | |
|
|
923 | Invoke the callback only once C<$octets> bytes have been read. Pass the |
|
|
924 | data read to the callback. The callback will never be called with less |
|
|
925 | data. |
|
|
926 | |
|
|
927 | Example: read 2 bytes. |
|
|
928 | |
|
|
929 | $handle->push_read (chunk => 2, sub { |
|
|
930 | warn "yay ", unpack "H*", $_[1]; |
|
|
931 | }); |
|
|
932 | |
|
|
933 | =cut |
|
|
934 | |
|
|
935 | register_read_type chunk => sub { |
532 | my ($self, $len, $cb) = @_; |
936 | my ($self, $cb, $len) = @_; |
533 | |
937 | |
534 | sub { |
938 | sub { |
535 | $len <= length $_[0]{rbuf} or return; |
939 | $len <= length $_[0]{rbuf} or return; |
536 | $cb->($_[0], substr $_[0]{rbuf}, 0, $len, ""); |
940 | $cb->($_[0], substr $_[0]{rbuf}, 0, $len, ""); |
537 | 1 |
941 | 1 |
538 | } |
942 | } |
539 | } |
943 | }; |
540 | |
944 | |
541 | sub push_read_chunk { |
945 | =item line => [$eol, ]$cb->($handle, $line, $eol) |
542 | $_[0]->push_read (&_read_chunk); |
|
|
543 | } |
|
|
544 | |
|
|
545 | |
|
|
546 | sub unshift_read_chunk { |
|
|
547 | $_[0]->unshift_read (&_read_chunk); |
|
|
548 | } |
|
|
549 | |
|
|
550 | =item $handle->push_read_line ([$eol, ]$cb->($self, $line, $eol)) |
|
|
551 | |
|
|
552 | =item $handle->unshift_read_line ([$eol, ]$cb->($self, $line, $eol)) |
|
|
553 | |
|
|
554 | Append the given callback to the end of the queue (C<push_read_line>) or |
|
|
555 | prepend it (C<unshift_read_line>). |
|
|
556 | |
946 | |
557 | The callback will be called only once a full line (including the end of |
947 | The callback will be called only once a full line (including the end of |
558 | line marker, C<$eol>) has been read. This line (excluding the end of line |
948 | line marker, C<$eol>) has been read. This line (excluding the end of line |
559 | marker) will be passed to the callback as second argument (C<$line>), and |
949 | marker) will be passed to the callback as second argument (C<$line>), and |
560 | the end of line marker as the third argument (C<$eol>). |
950 | the end of line marker as the third argument (C<$eol>). |
… | |
… | |
571 | Partial lines at the end of the stream will never be returned, as they are |
961 | Partial lines at the end of the stream will never be returned, as they are |
572 | not marked by the end of line marker. |
962 | not marked by the end of line marker. |
573 | |
963 | |
574 | =cut |
964 | =cut |
575 | |
965 | |
576 | sub _read_line($$) { |
966 | register_read_type line => sub { |
577 | my $self = shift; |
967 | my ($self, $cb, $eol) = @_; |
578 | my $cb = pop; |
|
|
579 | my $eol = @_ ? shift : qr|(\015?\012)|; |
|
|
580 | my $pos; |
|
|
581 | |
968 | |
|
|
969 | if (@_ < 3) { |
|
|
970 | # this is more than twice as fast as the generic code below |
|
|
971 | sub { |
|
|
972 | $_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return; |
|
|
973 | |
|
|
974 | $cb->($_[0], $1, $2); |
|
|
975 | 1 |
|
|
976 | } |
|
|
977 | } else { |
582 | $eol = quotemeta $eol unless ref $eol; |
978 | $eol = quotemeta $eol unless ref $eol; |
583 | $eol = qr|^(.*?)($eol)|s; |
979 | $eol = qr|^(.*?)($eol)|s; |
|
|
980 | |
|
|
981 | sub { |
|
|
982 | $_[0]{rbuf} =~ s/$eol// or return; |
|
|
983 | |
|
|
984 | $cb->($_[0], $1, $2); |
|
|
985 | 1 |
|
|
986 | } |
|
|
987 | } |
|
|
988 | }; |
|
|
989 | |
|
|
990 | =item regex => $accept[, $reject[, $skip], $cb->($handle, $data) |
|
|
991 | |
|
|
992 | Makes a regex match against the regex object C<$accept> and returns |
|
|
993 | everything up to and including the match. |
|
|
994 | |
|
|
995 | Example: read a single line terminated by '\n'. |
|
|
996 | |
|
|
997 | $handle->push_read (regex => qr<\n>, sub { ... }); |
|
|
998 | |
|
|
999 | If C<$reject> is given and not undef, then it determines when the data is |
|
|
1000 | to be rejected: it is matched against the data when the C<$accept> regex |
|
|
1001 | does not match and generates an C<EBADMSG> error when it matches. This is |
|
|
1002 | useful to quickly reject wrong data (to avoid waiting for a timeout or a |
|
|
1003 | receive buffer overflow). |
|
|
1004 | |
|
|
1005 | Example: expect a single decimal number followed by whitespace, reject |
|
|
1006 | anything else (not the use of an anchor). |
|
|
1007 | |
|
|
1008 | $handle->push_read (regex => qr<^[0-9]+\s>, qr<[^0-9]>, sub { ... }); |
|
|
1009 | |
|
|
1010 | If C<$skip> is given and not C<undef>, then it will be matched against |
|
|
1011 | the receive buffer when neither C<$accept> nor C<$reject> match, |
|
|
1012 | and everything preceding and including the match will be accepted |
|
|
1013 | unconditionally. This is useful to skip large amounts of data that you |
|
|
1014 | know cannot be matched, so that the C<$accept> or C<$reject> regex do not |
|
|
1015 | have to start matching from the beginning. This is purely an optimisation |
|
|
1016 | and is usually worth only when you expect more than a few kilobytes. |
|
|
1017 | |
|
|
1018 | Example: expect a http header, which ends at C<\015\012\015\012>. Since we |
|
|
1019 | expect the header to be very large (it isn't in practise, but...), we use |
|
|
1020 | a skip regex to skip initial portions. The skip regex is tricky in that |
|
|
1021 | it only accepts something not ending in either \015 or \012, as these are |
|
|
1022 | required for the accept regex. |
|
|
1023 | |
|
|
1024 | $handle->push_read (regex => |
|
|
1025 | qr<\015\012\015\012>, |
|
|
1026 | undef, # no reject |
|
|
1027 | qr<^.*[^\015\012]>, |
|
|
1028 | sub { ... }); |
|
|
1029 | |
|
|
1030 | =cut |
|
|
1031 | |
|
|
1032 | register_read_type regex => sub { |
|
|
1033 | my ($self, $cb, $accept, $reject, $skip) = @_; |
|
|
1034 | |
|
|
1035 | my $data; |
|
|
1036 | my $rbuf = \$self->{rbuf}; |
584 | |
1037 | |
585 | sub { |
1038 | sub { |
586 | $_[0]{rbuf} =~ s/$eol// or return; |
1039 | # accept |
|
|
1040 | if ($$rbuf =~ $accept) { |
|
|
1041 | $data .= substr $$rbuf, 0, $+[0], ""; |
|
|
1042 | $cb->($self, $data); |
|
|
1043 | return 1; |
|
|
1044 | } |
|
|
1045 | |
|
|
1046 | # reject |
|
|
1047 | if ($reject && $$rbuf =~ $reject) { |
|
|
1048 | $self->_error (&Errno::EBADMSG); |
|
|
1049 | } |
587 | |
1050 | |
588 | $cb->($_[0], $1, $2); |
1051 | # skip |
|
|
1052 | if ($skip && $$rbuf =~ $skip) { |
|
|
1053 | $data .= substr $$rbuf, 0, $+[0], ""; |
|
|
1054 | } |
|
|
1055 | |
|
|
1056 | () |
|
|
1057 | } |
|
|
1058 | }; |
|
|
1059 | |
|
|
1060 | =item netstring => $cb->($handle, $string) |
|
|
1061 | |
|
|
1062 | A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement). |
|
|
1063 | |
|
|
1064 | Throws an error with C<$!> set to EBADMSG on format violations. |
|
|
1065 | |
|
|
1066 | =cut |
|
|
1067 | |
|
|
1068 | register_read_type netstring => sub { |
|
|
1069 | my ($self, $cb) = @_; |
|
|
1070 | |
|
|
1071 | sub { |
|
|
1072 | unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) { |
|
|
1073 | if ($_[0]{rbuf} =~ /[^0-9]/) { |
|
|
1074 | $self->_error (&Errno::EBADMSG); |
|
|
1075 | } |
|
|
1076 | return; |
|
|
1077 | } |
|
|
1078 | |
|
|
1079 | my $len = $1; |
|
|
1080 | |
|
|
1081 | $self->unshift_read (chunk => $len, sub { |
|
|
1082 | my $string = $_[1]; |
|
|
1083 | $_[0]->unshift_read (chunk => 1, sub { |
|
|
1084 | if ($_[1] eq ",") { |
|
|
1085 | $cb->($_[0], $string); |
|
|
1086 | } else { |
|
|
1087 | $self->_error (&Errno::EBADMSG); |
|
|
1088 | } |
|
|
1089 | }); |
|
|
1090 | }); |
|
|
1091 | |
589 | 1 |
1092 | 1 |
590 | } |
1093 | } |
591 | } |
1094 | }; |
592 | |
1095 | |
593 | sub push_read_line { |
1096 | =item packstring => $format, $cb->($handle, $string) |
594 | $_[0]->push_read (&_read_line); |
|
|
595 | } |
|
|
596 | |
1097 | |
597 | sub unshift_read_line { |
1098 | An octet string prefixed with an encoded length. The encoding C<$format> |
598 | $_[0]->unshift_read (&_read_line); |
1099 | uses the same format as a Perl C<pack> format, but must specify a single |
599 | } |
1100 | integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an |
|
|
1101 | optional C<!>, C<< < >> or C<< > >> modifier). |
|
|
1102 | |
|
|
1103 | For example, DNS over TCP uses a prefix of C<n> (2 octet network order), |
|
|
1104 | EPP uses a prefix of C<N> (4 octtes). |
|
|
1105 | |
|
|
1106 | Example: read a block of data prefixed by its length in BER-encoded |
|
|
1107 | format (very efficient). |
|
|
1108 | |
|
|
1109 | $handle->push_read (packstring => "w", sub { |
|
|
1110 | my ($handle, $data) = @_; |
|
|
1111 | }); |
|
|
1112 | |
|
|
1113 | =cut |
|
|
1114 | |
|
|
1115 | register_read_type packstring => sub { |
|
|
1116 | my ($self, $cb, $format) = @_; |
|
|
1117 | |
|
|
1118 | sub { |
|
|
1119 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
|
|
1120 | defined (my $len = eval { unpack $format, $_[0]{rbuf} }) |
|
|
1121 | or return; |
|
|
1122 | |
|
|
1123 | $format = length pack $format, $len; |
|
|
1124 | |
|
|
1125 | # bypass unshift if we already have the remaining chunk |
|
|
1126 | if ($format + $len <= length $_[0]{rbuf}) { |
|
|
1127 | my $data = substr $_[0]{rbuf}, $format, $len; |
|
|
1128 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
|
|
1129 | $cb->($_[0], $data); |
|
|
1130 | } else { |
|
|
1131 | # remove prefix |
|
|
1132 | substr $_[0]{rbuf}, 0, $format, ""; |
|
|
1133 | |
|
|
1134 | # read remaining chunk |
|
|
1135 | $_[0]->unshift_read (chunk => $len, $cb); |
|
|
1136 | } |
|
|
1137 | |
|
|
1138 | 1 |
|
|
1139 | } |
|
|
1140 | }; |
|
|
1141 | |
|
|
1142 | =item json => $cb->($handle, $hash_or_arrayref) |
|
|
1143 | |
|
|
1144 | Reads a JSON object or array, decodes it and passes it to the callback. |
|
|
1145 | |
|
|
1146 | If a C<json> object was passed to the constructor, then that will be used |
|
|
1147 | for the final decode, otherwise it will create a JSON coder expecting UTF-8. |
|
|
1148 | |
|
|
1149 | This read type uses the incremental parser available with JSON version |
|
|
1150 | 2.09 (and JSON::XS version 2.2) and above. You have to provide a |
|
|
1151 | dependency on your own: this module will load the JSON module, but |
|
|
1152 | AnyEvent does not depend on it itself. |
|
|
1153 | |
|
|
1154 | Since JSON texts are fully self-delimiting, the C<json> read and write |
|
|
1155 | types are an ideal simple RPC protocol: just exchange JSON datagrams. See |
|
|
1156 | the C<json> write type description, above, for an actual example. |
|
|
1157 | |
|
|
1158 | =cut |
|
|
1159 | |
|
|
1160 | register_read_type json => sub { |
|
|
1161 | my ($self, $cb) = @_; |
|
|
1162 | |
|
|
1163 | require JSON; |
|
|
1164 | |
|
|
1165 | my $data; |
|
|
1166 | my $rbuf = \$self->{rbuf}; |
|
|
1167 | |
|
|
1168 | my $json = $self->{json} ||= JSON->new->utf8; |
|
|
1169 | |
|
|
1170 | sub { |
|
|
1171 | my $ref = $json->incr_parse ($self->{rbuf}); |
|
|
1172 | |
|
|
1173 | if ($ref) { |
|
|
1174 | $self->{rbuf} = $json->incr_text; |
|
|
1175 | $json->incr_text = ""; |
|
|
1176 | $cb->($self, $ref); |
|
|
1177 | |
|
|
1178 | 1 |
|
|
1179 | } else { |
|
|
1180 | $self->{rbuf} = ""; |
|
|
1181 | () |
|
|
1182 | } |
|
|
1183 | } |
|
|
1184 | }; |
|
|
1185 | |
|
|
1186 | =item storable => $cb->($handle, $ref) |
|
|
1187 | |
|
|
1188 | Deserialises a L<Storable> frozen representation as written by the |
|
|
1189 | C<storable> write type (BER-encoded length prefix followed by nfreeze'd |
|
|
1190 | data). |
|
|
1191 | |
|
|
1192 | Raises C<EBADMSG> error if the data could not be decoded. |
|
|
1193 | |
|
|
1194 | =cut |
|
|
1195 | |
|
|
1196 | register_read_type storable => sub { |
|
|
1197 | my ($self, $cb) = @_; |
|
|
1198 | |
|
|
1199 | require Storable; |
|
|
1200 | |
|
|
1201 | sub { |
|
|
1202 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
|
|
1203 | defined (my $len = eval { unpack "w", $_[0]{rbuf} }) |
|
|
1204 | or return; |
|
|
1205 | |
|
|
1206 | my $format = length pack "w", $len; |
|
|
1207 | |
|
|
1208 | # bypass unshift if we already have the remaining chunk |
|
|
1209 | if ($format + $len <= length $_[0]{rbuf}) { |
|
|
1210 | my $data = substr $_[0]{rbuf}, $format, $len; |
|
|
1211 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
|
|
1212 | $cb->($_[0], Storable::thaw ($data)); |
|
|
1213 | } else { |
|
|
1214 | # remove prefix |
|
|
1215 | substr $_[0]{rbuf}, 0, $format, ""; |
|
|
1216 | |
|
|
1217 | # read remaining chunk |
|
|
1218 | $_[0]->unshift_read (chunk => $len, sub { |
|
|
1219 | if (my $ref = eval { Storable::thaw ($_[1]) }) { |
|
|
1220 | $cb->($_[0], $ref); |
|
|
1221 | } else { |
|
|
1222 | $self->_error (&Errno::EBADMSG); |
|
|
1223 | } |
|
|
1224 | }); |
|
|
1225 | } |
|
|
1226 | |
|
|
1227 | 1 |
|
|
1228 | } |
|
|
1229 | }; |
|
|
1230 | |
|
|
1231 | =back |
|
|
1232 | |
|
|
1233 | =item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args) |
|
|
1234 | |
|
|
1235 | This function (not method) lets you add your own types to C<push_read>. |
|
|
1236 | |
|
|
1237 | Whenever the given C<type> is used, C<push_read> will invoke the code |
|
|
1238 | reference with the handle object, the callback and the remaining |
|
|
1239 | arguments. |
|
|
1240 | |
|
|
1241 | The code reference is supposed to return a callback (usually a closure) |
|
|
1242 | that works as a plain read callback (see C<< ->push_read ($cb) >>). |
|
|
1243 | |
|
|
1244 | It should invoke the passed callback when it is done reading (remember to |
|
|
1245 | pass C<$handle> as first argument as all other callbacks do that). |
|
|
1246 | |
|
|
1247 | Note that this is a function, and all types registered this way will be |
|
|
1248 | global, so try to use unique names. |
|
|
1249 | |
|
|
1250 | For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>, |
|
|
1251 | search for C<register_read_type>)). |
600 | |
1252 | |
601 | =item $handle->stop_read |
1253 | =item $handle->stop_read |
602 | |
1254 | |
603 | =item $handle->start_read |
1255 | =item $handle->start_read |
604 | |
1256 | |
605 | In rare cases you actually do not want to read anything from the |
1257 | In rare cases you actually do not want to read anything from the |
606 | socket. In this case you can call C<stop_read>. Neither C<on_read> no |
1258 | socket. In this case you can call C<stop_read>. Neither C<on_read> nor |
607 | any queued callbacks will be executed then. To start reading again, call |
1259 | any queued callbacks will be executed then. To start reading again, call |
608 | C<start_read>. |
1260 | C<start_read>. |
609 | |
1261 | |
|
|
1262 | Note that AnyEvent::Handle will automatically C<start_read> for you when |
|
|
1263 | you change the C<on_read> callback or push/unshift a read callback, and it |
|
|
1264 | will automatically C<stop_read> for you when neither C<on_read> is set nor |
|
|
1265 | there are any read requests in the queue. |
|
|
1266 | |
|
|
1267 | These methods will have no effect when in TLS mode (as TLS doesn't support |
|
|
1268 | half-duplex connections). |
|
|
1269 | |
610 | =cut |
1270 | =cut |
611 | |
1271 | |
612 | sub stop_read { |
1272 | sub stop_read { |
613 | my ($self) = @_; |
1273 | my ($self) = @_; |
614 | |
1274 | |
615 | delete $self->{rw}; |
1275 | delete $self->{_rw} unless $self->{tls}; |
616 | } |
1276 | } |
617 | |
1277 | |
618 | sub start_read { |
1278 | sub start_read { |
619 | my ($self) = @_; |
1279 | my ($self) = @_; |
620 | |
1280 | |
621 | unless ($self->{rw} || $self->{eof}) { |
1281 | unless ($self->{_rw} || $self->{_eof}) { |
622 | Scalar::Util::weaken $self; |
1282 | Scalar::Util::weaken $self; |
623 | |
1283 | |
624 | $self->{rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
1284 | $self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
625 | my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf}; |
1285 | my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf}); |
626 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
1286 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
627 | |
1287 | |
628 | if ($len > 0) { |
1288 | if ($len > 0) { |
629 | $self->{filter_r} |
1289 | $self->{_activity} = AnyEvent->now; |
630 | ? $self->{filter_r}->($self, $rbuf) |
1290 | |
631 | : $self->_drain_rbuf; |
1291 | if ($self->{tls}) { |
|
|
1292 | Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf); |
|
|
1293 | |
|
|
1294 | &_dotls ($self); |
|
|
1295 | } else { |
|
|
1296 | $self->_drain_rbuf unless $self->{_in_drain}; |
|
|
1297 | } |
632 | |
1298 | |
633 | } elsif (defined $len) { |
1299 | } elsif (defined $len) { |
634 | delete $self->{rw}; |
1300 | delete $self->{_rw}; |
635 | $self->{eof} = 1; |
1301 | $self->{_eof} = 1; |
636 | $self->_drain_rbuf; |
1302 | $self->_drain_rbuf unless $self->{_in_drain}; |
637 | |
1303 | |
638 | } elsif ($! != EAGAIN && $! != EINTR) { |
1304 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
639 | return $self->error; |
1305 | return $self->_error ($!, 1); |
640 | } |
1306 | } |
641 | }); |
1307 | }); |
642 | } |
1308 | } |
643 | } |
1309 | } |
644 | |
1310 | |
|
|
1311 | # poll the write BIO and send the data if applicable |
645 | sub _dotls { |
1312 | sub _dotls { |
646 | my ($self) = @_; |
1313 | my ($self) = @_; |
647 | |
1314 | |
|
|
1315 | my $tmp; |
|
|
1316 | |
648 | if (length $self->{tls_wbuf}) { |
1317 | if (length $self->{_tls_wbuf}) { |
649 | while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{tls_wbuf})) > 0) { |
1318 | while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) { |
650 | substr $self->{tls_wbuf}, 0, $len, ""; |
1319 | substr $self->{_tls_wbuf}, 0, $tmp, ""; |
651 | } |
1320 | } |
652 | } |
1321 | } |
653 | |
1322 | |
654 | if (defined (my $buf = Net::SSLeay::BIO_read ($self->{tls_wbio}))) { |
1323 | while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) { |
|
|
1324 | unless (length $tmp) { |
|
|
1325 | # let's treat SSL-eof as we treat normal EOF |
|
|
1326 | delete $self->{_rw}; |
|
|
1327 | $self->{_eof} = 1; |
|
|
1328 | &_freetls; |
|
|
1329 | } |
|
|
1330 | |
|
|
1331 | $self->{rbuf} .= $tmp; |
|
|
1332 | $self->_drain_rbuf unless $self->{_in_drain}; |
|
|
1333 | $self->{tls} or return; # tls session might have gone away in callback |
|
|
1334 | } |
|
|
1335 | |
|
|
1336 | $tmp = Net::SSLeay::get_error ($self->{tls}, -1); |
|
|
1337 | |
|
|
1338 | if ($tmp != Net::SSLeay::ERROR_WANT_READ ()) { |
|
|
1339 | if ($tmp == Net::SSLeay::ERROR_SYSCALL ()) { |
|
|
1340 | return $self->_error ($!, 1); |
|
|
1341 | } elsif ($tmp == Net::SSLeay::ERROR_SSL ()) { |
|
|
1342 | return $self->_error (&Errno::EIO, 1); |
|
|
1343 | } |
|
|
1344 | |
|
|
1345 | # all other errors are fine for our purposes |
|
|
1346 | } |
|
|
1347 | |
|
|
1348 | while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
655 | $self->{wbuf} .= $buf; |
1349 | $self->{wbuf} .= $tmp; |
656 | $self->_drain_wbuf; |
1350 | $self->_drain_wbuf; |
657 | } |
1351 | } |
658 | |
|
|
659 | while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) { |
|
|
660 | $self->{rbuf} .= $buf; |
|
|
661 | $self->_drain_rbuf; |
|
|
662 | } |
|
|
663 | |
|
|
664 | my $err = Net::SSLeay::get_error ($self->{tls}, -1); |
|
|
665 | |
|
|
666 | if ($err!= Net::SSLeay::ERROR_WANT_READ ()) { |
|
|
667 | if ($err == Net::SSLeay::ERROR_SYSCALL ()) { |
|
|
668 | $self->error; |
|
|
669 | } elsif ($err == Net::SSLeay::ERROR_SSL ()) { |
|
|
670 | $! = &Errno::EIO; |
|
|
671 | $self->error; |
|
|
672 | } |
|
|
673 | |
|
|
674 | # all others are fine for our purposes |
|
|
675 | } |
|
|
676 | } |
1352 | } |
677 | |
1353 | |
678 | # TODO: maybe document... |
1354 | =item $handle->starttls ($tls[, $tls_ctx]) |
|
|
1355 | |
|
|
1356 | Instead of starting TLS negotiation immediately when the AnyEvent::Handle |
|
|
1357 | object is created, you can also do that at a later time by calling |
|
|
1358 | C<starttls>. |
|
|
1359 | |
|
|
1360 | The first argument is the same as the C<tls> constructor argument (either |
|
|
1361 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
|
|
1362 | |
|
|
1363 | The second argument is the optional C<Net::SSLeay::CTX> object that is |
|
|
1364 | used when AnyEvent::Handle has to create its own TLS connection object. |
|
|
1365 | |
|
|
1366 | The TLS connection object will end up in C<< $handle->{tls} >> after this |
|
|
1367 | call and can be used or changed to your liking. Note that the handshake |
|
|
1368 | might have already started when this function returns. |
|
|
1369 | |
|
|
1370 | If it an error to start a TLS handshake more than once per |
|
|
1371 | AnyEvent::Handle object (this is due to bugs in OpenSSL). |
|
|
1372 | |
|
|
1373 | =cut |
|
|
1374 | |
679 | sub starttls { |
1375 | sub starttls { |
680 | my ($self, $ssl, $ctx) = @_; |
1376 | my ($self, $ssl, $ctx) = @_; |
681 | |
1377 | |
|
|
1378 | require Net::SSLeay; |
|
|
1379 | |
|
|
1380 | Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object" |
|
|
1381 | if $self->{tls}; |
|
|
1382 | |
682 | if ($ssl eq "accept") { |
1383 | if ($ssl eq "accept") { |
683 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
1384 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
684 | Net::SSLeay::set_accept_state ($ssl); |
1385 | Net::SSLeay::set_accept_state ($ssl); |
685 | } elsif ($ssl eq "connect") { |
1386 | } elsif ($ssl eq "connect") { |
686 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
1387 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
… | |
… | |
691 | |
1392 | |
692 | # basically, this is deep magic (because SSL_read should have the same issues) |
1393 | # basically, this is deep magic (because SSL_read should have the same issues) |
693 | # but the openssl maintainers basically said: "trust us, it just works". |
1394 | # but the openssl maintainers basically said: "trust us, it just works". |
694 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
1395 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
695 | # and mismaintained ssleay-module doesn't even offer them). |
1396 | # and mismaintained ssleay-module doesn't even offer them). |
|
|
1397 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
|
|
1398 | # |
|
|
1399 | # in short: this is a mess. |
|
|
1400 | # |
|
|
1401 | # note that we do not try to keep the length constant between writes as we are required to do. |
|
|
1402 | # we assume that most (but not all) of this insanity only applies to non-blocking cases, |
|
|
1403 | # and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to |
|
|
1404 | # have identity issues in that area. |
696 | Net::SSLeay::CTX_set_mode ($self->{tls}, |
1405 | Net::SSLeay::CTX_set_mode ($self->{tls}, |
697 | (eval { Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
1406 | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
698 | | (eval { Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
1407 | | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
699 | |
1408 | |
700 | $self->{tls_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1409 | $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
701 | $self->{tls_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1410 | $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
702 | |
1411 | |
703 | Net::SSLeay::set_bio ($ssl, $self->{tls_rbio}, $self->{tls_wbio}); |
1412 | Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio}); |
704 | |
1413 | |
705 | $self->{filter_w} = sub { |
1414 | &_dotls; # need to trigger the initial handshake |
706 | $_[0]{tls_wbuf} .= ${$_[1]}; |
1415 | $self->start_read; # make sure we actually do read |
|
|
1416 | } |
|
|
1417 | |
|
|
1418 | =item $handle->stoptls |
|
|
1419 | |
|
|
1420 | Shuts down the SSL connection - this makes a proper EOF handshake by |
|
|
1421 | sending a close notify to the other side, but since OpenSSL doesn't |
|
|
1422 | support non-blocking shut downs, it is not possible to re-use the stream |
|
|
1423 | afterwards. |
|
|
1424 | |
|
|
1425 | =cut |
|
|
1426 | |
|
|
1427 | sub stoptls { |
|
|
1428 | my ($self) = @_; |
|
|
1429 | |
|
|
1430 | if ($self->{tls}) { |
|
|
1431 | Net::SSLeay::shutdown ($self->{tls}); |
|
|
1432 | |
707 | &_dotls; |
1433 | &_dotls; |
|
|
1434 | |
|
|
1435 | # we don't give a shit. no, we do, but we can't. no... |
|
|
1436 | # we, we... have to use openssl :/ |
|
|
1437 | &_freetls; |
708 | }; |
1438 | } |
709 | $self->{filter_r} = sub { |
1439 | } |
710 | Net::SSLeay::BIO_write ($_[0]{tls_rbio}, ${$_[1]}); |
1440 | |
711 | &_dotls; |
1441 | sub _freetls { |
|
|
1442 | my ($self) = @_; |
|
|
1443 | |
|
|
1444 | return unless $self->{tls}; |
|
|
1445 | |
|
|
1446 | Net::SSLeay::free (delete $self->{tls}); |
712 | }; |
1447 | |
|
|
1448 | delete @$self{qw(_rbio _wbio _tls_wbuf)}; |
713 | } |
1449 | } |
714 | |
1450 | |
715 | sub DESTROY { |
1451 | sub DESTROY { |
716 | my $self = shift; |
1452 | my $self = shift; |
717 | |
1453 | |
718 | Net::SSLeay::free (delete $self->{tls}) if $self->{tls}; |
1454 | &_freetls; |
|
|
1455 | |
|
|
1456 | my $linger = exists $self->{linger} ? $self->{linger} : 3600; |
|
|
1457 | |
|
|
1458 | if ($linger && length $self->{wbuf}) { |
|
|
1459 | my $fh = delete $self->{fh}; |
|
|
1460 | my $wbuf = delete $self->{wbuf}; |
|
|
1461 | |
|
|
1462 | my @linger; |
|
|
1463 | |
|
|
1464 | push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub { |
|
|
1465 | my $len = syswrite $fh, $wbuf, length $wbuf; |
|
|
1466 | |
|
|
1467 | if ($len > 0) { |
|
|
1468 | substr $wbuf, 0, $len, ""; |
|
|
1469 | } else { |
|
|
1470 | @linger = (); # end |
|
|
1471 | } |
|
|
1472 | }); |
|
|
1473 | push @linger, AnyEvent->timer (after => $linger, cb => sub { |
|
|
1474 | @linger = (); |
|
|
1475 | }); |
|
|
1476 | } |
|
|
1477 | } |
|
|
1478 | |
|
|
1479 | =item $handle->destroy |
|
|
1480 | |
|
|
1481 | Shuts down the handle object as much as possible - this call ensures that |
|
|
1482 | no further callbacks will be invoked and resources will be freed as much |
|
|
1483 | as possible. You must not call any methods on the object afterwards. |
|
|
1484 | |
|
|
1485 | Normally, you can just "forget" any references to an AnyEvent::Handle |
|
|
1486 | object and it will simply shut down. This works in fatal error and EOF |
|
|
1487 | callbacks, as well as code outside. It does I<NOT> work in a read or write |
|
|
1488 | callback, so when you want to destroy the AnyEvent::Handle object from |
|
|
1489 | within such an callback. You I<MUST> call C<< ->destroy >> explicitly in |
|
|
1490 | that case. |
|
|
1491 | |
|
|
1492 | The handle might still linger in the background and write out remaining |
|
|
1493 | data, as specified by the C<linger> option, however. |
|
|
1494 | |
|
|
1495 | =cut |
|
|
1496 | |
|
|
1497 | sub destroy { |
|
|
1498 | my ($self) = @_; |
|
|
1499 | |
|
|
1500 | $self->DESTROY; |
|
|
1501 | %$self = (); |
719 | } |
1502 | } |
720 | |
1503 | |
721 | =item AnyEvent::Handle::TLS_CTX |
1504 | =item AnyEvent::Handle::TLS_CTX |
722 | |
1505 | |
723 | This function creates and returns the Net::SSLeay::CTX object used by |
1506 | This function creates and returns the Net::SSLeay::CTX object used by |
… | |
… | |
753 | } |
1536 | } |
754 | } |
1537 | } |
755 | |
1538 | |
756 | =back |
1539 | =back |
757 | |
1540 | |
|
|
1541 | |
|
|
1542 | =head1 NONFREQUENTLY ASKED QUESTIONS |
|
|
1543 | |
|
|
1544 | =over 4 |
|
|
1545 | |
|
|
1546 | =item I C<undef> the AnyEvent::Handle reference inside my callback and |
|
|
1547 | still get further invocations! |
|
|
1548 | |
|
|
1549 | That's because AnyEvent::Handle keeps a reference to itself when handling |
|
|
1550 | read or write callbacks. |
|
|
1551 | |
|
|
1552 | It is only safe to "forget" the reference inside EOF or error callbacks, |
|
|
1553 | from within all other callbacks, you need to explicitly call the C<< |
|
|
1554 | ->destroy >> method. |
|
|
1555 | |
|
|
1556 | =item I get different callback invocations in TLS mode/Why can't I pause |
|
|
1557 | reading? |
|
|
1558 | |
|
|
1559 | Unlike, say, TCP, TLS connections do not consist of two independent |
|
|
1560 | communication channels, one for each direction. Or put differently. The |
|
|
1561 | read and write directions are not independent of each other: you cannot |
|
|
1562 | write data unless you are also prepared to read, and vice versa. |
|
|
1563 | |
|
|
1564 | This can mean than, in TLS mode, you might get C<on_error> or C<on_eof> |
|
|
1565 | callback invocations when you are not expecting any read data - the reason |
|
|
1566 | is that AnyEvent::Handle always reads in TLS mode. |
|
|
1567 | |
|
|
1568 | During the connection, you have to make sure that you always have a |
|
|
1569 | non-empty read-queue, or an C<on_read> watcher. At the end of the |
|
|
1570 | connection (or when you no longer want to use it) you can call the |
|
|
1571 | C<destroy> method. |
|
|
1572 | |
|
|
1573 | =item How do I read data until the other side closes the connection? |
|
|
1574 | |
|
|
1575 | If you just want to read your data into a perl scalar, the easiest way |
|
|
1576 | to achieve this is by setting an C<on_read> callback that does nothing, |
|
|
1577 | clearing the C<on_eof> callback and in the C<on_error> callback, the data |
|
|
1578 | will be in C<$_[0]{rbuf}>: |
|
|
1579 | |
|
|
1580 | $handle->on_read (sub { }); |
|
|
1581 | $handle->on_eof (undef); |
|
|
1582 | $handle->on_error (sub { |
|
|
1583 | my $data = delete $_[0]{rbuf}; |
|
|
1584 | undef $handle; |
|
|
1585 | }); |
|
|
1586 | |
|
|
1587 | The reason to use C<on_error> is that TCP connections, due to latencies |
|
|
1588 | and packets loss, might get closed quite violently with an error, when in |
|
|
1589 | fact, all data has been received. |
|
|
1590 | |
|
|
1591 | It is usually better to use acknowledgements when transferring data, |
|
|
1592 | to make sure the other side hasn't just died and you got the data |
|
|
1593 | intact. This is also one reason why so many internet protocols have an |
|
|
1594 | explicit QUIT command. |
|
|
1595 | |
|
|
1596 | =item I don't want to destroy the handle too early - how do I wait until |
|
|
1597 | all data has been written? |
|
|
1598 | |
|
|
1599 | After writing your last bits of data, set the C<on_drain> callback |
|
|
1600 | and destroy the handle in there - with the default setting of |
|
|
1601 | C<low_water_mark> this will be called precisely when all data has been |
|
|
1602 | written to the socket: |
|
|
1603 | |
|
|
1604 | $handle->push_write (...); |
|
|
1605 | $handle->on_drain (sub { |
|
|
1606 | warn "all data submitted to the kernel\n"; |
|
|
1607 | undef $handle; |
|
|
1608 | }); |
|
|
1609 | |
|
|
1610 | =back |
|
|
1611 | |
|
|
1612 | |
|
|
1613 | =head1 SUBCLASSING AnyEvent::Handle |
|
|
1614 | |
|
|
1615 | In many cases, you might want to subclass AnyEvent::Handle. |
|
|
1616 | |
|
|
1617 | To make this easier, a given version of AnyEvent::Handle uses these |
|
|
1618 | conventions: |
|
|
1619 | |
|
|
1620 | =over 4 |
|
|
1621 | |
|
|
1622 | =item * all constructor arguments become object members. |
|
|
1623 | |
|
|
1624 | At least initially, when you pass a C<tls>-argument to the constructor it |
|
|
1625 | will end up in C<< $handle->{tls} >>. Those members might be changed or |
|
|
1626 | mutated later on (for example C<tls> will hold the TLS connection object). |
|
|
1627 | |
|
|
1628 | =item * other object member names are prefixed with an C<_>. |
|
|
1629 | |
|
|
1630 | All object members not explicitly documented (internal use) are prefixed |
|
|
1631 | with an underscore character, so the remaining non-C<_>-namespace is free |
|
|
1632 | for use for subclasses. |
|
|
1633 | |
|
|
1634 | =item * all members not documented here and not prefixed with an underscore |
|
|
1635 | are free to use in subclasses. |
|
|
1636 | |
|
|
1637 | Of course, new versions of AnyEvent::Handle may introduce more "public" |
|
|
1638 | member variables, but thats just life, at least it is documented. |
|
|
1639 | |
|
|
1640 | =back |
|
|
1641 | |
758 | =head1 AUTHOR |
1642 | =head1 AUTHOR |
759 | |
1643 | |
760 | Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>. |
1644 | Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>. |
761 | |
1645 | |
762 | =cut |
1646 | =cut |