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 filehandles via AnyEvent |
15 | AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent |
16 | |
16 | |
17 | =cut |
17 | =cut |
18 | |
18 | |
19 | our $VERSION = '0.02'; |
19 | our $VERSION = 4.351; |
20 | |
20 | |
21 | =head1 SYNOPSIS |
21 | =head1 SYNOPSIS |
22 | |
22 | |
23 | use AnyEvent; |
23 | use AnyEvent; |
24 | use AnyEvent::Handle; |
24 | use AnyEvent::Handle; |
25 | |
25 | |
26 | my $cv = AnyEvent->condvar; |
26 | my $cv = AnyEvent->condvar; |
27 | |
27 | |
28 | my $ae_fh = AnyEvent::Handle->new (fh => \*STDIN); |
28 | my $handle = |
29 | |
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30 | #TODO |
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31 | |
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32 | # or use the constructor to pass the callback: |
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33 | |
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34 | my $ae_fh2 = |
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35 | AnyEvent::Handle->new ( |
29 | AnyEvent::Handle->new ( |
36 | fh => \*STDIN, |
30 | fh => \*STDIN, |
37 | on_eof => sub { |
31 | on_eof => sub { |
38 | $cv->broadcast; |
32 | $cv->send; |
39 | }, |
33 | }, |
40 | #TODO |
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41 | ); |
34 | ); |
42 | |
35 | |
43 | $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; |
44 | |
47 | |
45 | =head1 DESCRIPTION |
48 | =head1 DESCRIPTION |
46 | |
49 | |
47 | 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 |
48 | filehandles (and sockets, see L<AnyEvent::Socket> for an easy way to make |
51 | filehandles. For utility functions for doing non-blocking connects and accepts |
49 | non-blocking resolves and connects). |
52 | on sockets see L<AnyEvent::Util>. |
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53 | |
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54 | The L<AnyEvent::Intro> tutorial contains some well-documented |
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55 | AnyEvent::Handle examples. |
50 | |
56 | |
51 | 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 |
52 | 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 |
53 | treatment of characters applies to this module as well. |
59 | treatment of characters applies to this module as well. |
54 | |
60 | |
… | |
… | |
67 | |
73 | |
68 | =item fh => $filehandle [MANDATORY] |
74 | =item fh => $filehandle [MANDATORY] |
69 | |
75 | |
70 | The filehandle this L<AnyEvent::Handle> object will operate on. |
76 | The filehandle this L<AnyEvent::Handle> object will operate on. |
71 | |
77 | |
72 | NOTE: The filehandle will be set to non-blocking (using |
78 | NOTE: The filehandle will be set to non-blocking mode (using |
73 | 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. |
74 | |
81 | |
75 | =item on_eof => $cb->($self) [MANDATORY] |
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76 | |
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77 | Set the callback to be called on EOF. |
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78 | |
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79 | =item on_error => $cb->($self) |
82 | =item on_eof => $cb->($handle) |
80 | |
83 | |
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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. |
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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 | |
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93 | While not mandatory, it is I<highly> recommended to set an EOF callback, |
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94 | otherwise you might end up with a closed socket while you are still |
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95 | waiting for data. |
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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 | |
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100 | =item on_error => $cb->($handle, $fatal) |
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101 | |
81 | This is the fatal error callback, that is called when, well, a fatal error |
102 | This is the error callback, which is called when, well, some error |
82 | ocurs, such as not being able to resolve the hostname, failure to connect |
103 | occured, such as not being able to resolve the hostname, failure to |
83 | or a read error. |
104 | connect or a read error. |
84 | |
105 | |
85 | The object will not be in a usable state when this callback has been |
106 | Some errors are fatal (which is indicated by C<$fatal> being true). On |
86 | 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>). |
87 | |
116 | |
88 | On callback entrance, the value of C<$!> contains the operating system |
117 | On callback entrance, the value of C<$!> contains the operating system |
89 | error (or C<ENOSPC> or C<EPIPE>). |
118 | error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>). |
90 | |
119 | |
91 | 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 |
92 | 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 |
93 | die. |
122 | C<croak>. |
94 | |
123 | |
95 | =item on_read => $cb->($self) |
124 | =item on_read => $cb->($handle) |
96 | |
125 | |
97 | 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 |
98 | 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). |
99 | |
130 | |
100 | 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 >> |
101 | method or acces sthe C<$self->{rbuf}> member directly. |
132 | method or access the C<$handle->{rbuf}> member directly. Note that you |
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133 | must not enlarge or modify the read buffer, you can only remove data at |
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134 | the beginning from it. |
102 | |
135 | |
103 | When an EOF condition is detected then AnyEvent::Handle will first try to |
136 | When an EOF condition is detected then AnyEvent::Handle will first try to |
104 | feed all the remaining data to the queued callbacks and C<on_read> before |
137 | feed all the remaining data to the queued callbacks and C<on_read> before |
105 | calling the C<on_eof> callback. If no progress can be made, then a fatal |
138 | calling the C<on_eof> callback. If no progress can be made, then a fatal |
106 | error will be raised (with C<$!> set to C<EPIPE>). |
139 | error will be raised (with C<$!> set to C<EPIPE>). |
107 | |
140 | |
108 | =item on_drain => $cb->() |
141 | =item on_drain => $cb->($handle) |
109 | |
142 | |
110 | This sets the callback that is called when the write buffer becomes empty |
143 | This sets the callback that is called when the write buffer becomes empty |
111 | (or when the callback is set and the buffer is empty already). |
144 | (or when the callback is set and the buffer is empty already). |
112 | |
145 | |
113 | To append to the write buffer, use the C<< ->push_write >> method. |
146 | To append to the write buffer, use the C<< ->push_write >> method. |
114 | |
147 | |
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148 | This callback is useful when you don't want to put all of your write data |
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149 | into the queue at once, for example, when you want to write the contents |
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150 | of some file to the socket you might not want to read the whole file into |
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151 | memory and push it into the queue, but instead only read more data from |
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152 | the file when the write queue becomes empty. |
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153 | |
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154 | =item timeout => $fractional_seconds |
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155 | |
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156 | If non-zero, then this enables an "inactivity" timeout: whenever this many |
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157 | seconds pass without a successful read or write on the underlying file |
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158 | handle, the C<on_timeout> callback will be invoked (and if that one is |
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159 | missing, a non-fatal C<ETIMEDOUT> error will be raised). |
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160 | |
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161 | Note that timeout processing is also active when you currently do not have |
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162 | any outstanding read or write requests: If you plan to keep the connection |
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163 | idle then you should disable the timout temporarily or ignore the timeout |
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164 | in the C<on_timeout> callback, in which case AnyEvent::Handle will simply |
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165 | restart the timeout. |
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166 | |
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167 | Zero (the default) disables this timeout. |
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168 | |
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169 | =item on_timeout => $cb->($handle) |
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170 | |
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171 | Called whenever the inactivity timeout passes. If you return from this |
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172 | callback, then the timeout will be reset as if some activity had happened, |
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173 | so this condition is not fatal in any way. |
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174 | |
115 | =item rbuf_max => <bytes> |
175 | =item rbuf_max => <bytes> |
116 | |
176 | |
117 | If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
177 | If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
118 | when the read buffer ever (strictly) exceeds this size. This is useful to |
178 | when the read buffer ever (strictly) exceeds this size. This is useful to |
119 | avoid denial-of-service attacks. |
179 | avoid some forms of denial-of-service attacks. |
120 | |
180 | |
121 | For example, a server accepting connections from untrusted sources should |
181 | For example, a server accepting connections from untrusted sources should |
122 | be configured to accept only so-and-so much data that it cannot act on |
182 | be configured to accept only so-and-so much data that it cannot act on |
123 | (for example, when expecting a line, an attacker could send an unlimited |
183 | (for example, when expecting a line, an attacker could send an unlimited |
124 | amount of data without a callback ever being called as long as the line |
184 | amount of data without a callback ever being called as long as the line |
125 | isn't finished). |
185 | isn't finished). |
126 | |
186 | |
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187 | =item autocork => <boolean> |
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188 | |
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189 | When disabled (the default), then C<push_write> will try to immediately |
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190 | write the data to the handle, if possible. This avoids having to register |
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191 | a write watcher and wait for the next event loop iteration, but can |
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192 | be inefficient if you write multiple small chunks (on the wire, this |
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193 | disadvantage is usually avoided by your kernel's nagle algorithm, see |
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194 | C<no_delay>, but this option can save costly syscalls). |
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195 | |
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196 | When enabled, then writes will always be queued till the next event loop |
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197 | iteration. This is efficient when you do many small writes per iteration, |
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198 | but less efficient when you do a single write only per iteration (or when |
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199 | the write buffer often is full). It also increases write latency. |
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200 | |
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201 | =item no_delay => <boolean> |
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202 | |
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203 | When doing small writes on sockets, your operating system kernel might |
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204 | wait a bit for more data before actually sending it out. This is called |
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205 | the Nagle algorithm, and usually it is beneficial. |
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206 | |
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207 | In some situations you want as low a delay as possible, which can be |
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208 | accomplishd by setting this option to a true value. |
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209 | |
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210 | The default is your opertaing system's default behaviour (most likely |
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211 | enabled), this option explicitly enables or disables it, if possible. |
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212 | |
127 | =item read_size => <bytes> |
213 | =item read_size => <bytes> |
128 | |
214 | |
129 | The default read block size (the amount of bytes this module will try to read |
215 | The default read block size (the amount of bytes this module will |
130 | on each [loop iteration). Default: C<4096>. |
216 | try to read during each loop iteration, which affects memory |
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217 | requirements). Default: C<8192>. |
131 | |
218 | |
132 | =item low_water_mark => <bytes> |
219 | =item low_water_mark => <bytes> |
133 | |
220 | |
134 | Sets the amount of bytes (default: C<0>) that make up an "empty" write |
221 | Sets the amount of bytes (default: C<0>) that make up an "empty" write |
135 | buffer: If the write reaches this size or gets even samller it is |
222 | buffer: If the write reaches this size or gets even samller it is |
136 | considered empty. |
223 | considered empty. |
137 | |
224 | |
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225 | Sometimes it can be beneficial (for performance reasons) to add data to |
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226 | the write buffer before it is fully drained, but this is a rare case, as |
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227 | the operating system kernel usually buffers data as well, so the default |
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228 | is good in almost all cases. |
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229 | |
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230 | =item linger => <seconds> |
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231 | |
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232 | If non-zero (default: C<3600>), then the destructor of the |
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233 | AnyEvent::Handle object will check whether there is still outstanding |
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234 | write data and will install a watcher that will write this data to the |
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235 | socket. No errors will be reported (this mostly matches how the operating |
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236 | system treats outstanding data at socket close time). |
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237 | |
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238 | This will not work for partial TLS data that could not be encoded |
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239 | yet. This data will be lost. Calling the C<stoptls> method in time might |
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240 | help. |
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241 | |
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242 | =item tls => "accept" | "connect" | Net::SSLeay::SSL object |
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243 | |
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244 | When this parameter is given, it enables TLS (SSL) mode, that means |
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245 | AnyEvent will start a TLS handshake as soon as the conenction has been |
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246 | established and will transparently encrypt/decrypt data afterwards. |
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247 | |
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248 | TLS mode requires Net::SSLeay to be installed (it will be loaded |
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249 | automatically when you try to create a TLS handle): this module doesn't |
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250 | have a dependency on that module, so if your module requires it, you have |
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251 | to add the dependency yourself. |
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252 | |
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253 | Unlike TCP, TLS has a server and client side: for the TLS server side, use |
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254 | C<accept>, and for the TLS client side of a connection, use C<connect> |
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255 | mode. |
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256 | |
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257 | You can also provide your own TLS connection object, but you have |
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258 | to make sure that you call either C<Net::SSLeay::set_connect_state> |
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259 | or C<Net::SSLeay::set_accept_state> on it before you pass it to |
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260 | AnyEvent::Handle. |
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261 | |
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262 | B<IMPORTANT:> since Net::SSLeay "objects" are really only integers, |
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263 | passing in the wrong integer will lead to certain crash. This most often |
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264 | happens when one uses a stylish C<< tls => 1 >> and is surprised about the |
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265 | segmentation fault. |
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266 | |
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267 | See the C<< ->starttls >> method for when need to start TLS negotiation later. |
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268 | |
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269 | =item tls_ctx => $ssl_ctx |
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270 | |
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271 | Use the given C<Net::SSLeay::CTX> object to create the new TLS connection |
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272 | (unless a connection object was specified directly). If this parameter is |
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273 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
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274 | |
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275 | =item json => JSON or JSON::XS object |
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276 | |
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277 | This is the json coder object used by the C<json> read and write types. |
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278 | |
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279 | If you don't supply it, then AnyEvent::Handle will create and use a |
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280 | suitable one (on demand), which will write and expect UTF-8 encoded JSON |
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281 | texts. |
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282 | |
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283 | Note that you are responsible to depend on the JSON module if you want to |
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284 | use this functionality, as AnyEvent does not have a dependency itself. |
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285 | |
138 | =back |
286 | =back |
139 | |
287 | |
140 | =cut |
288 | =cut |
141 | |
289 | |
142 | sub new { |
290 | sub new { |
… | |
… | |
146 | |
294 | |
147 | $self->{fh} or Carp::croak "mandatory argument fh is missing"; |
295 | $self->{fh} or Carp::croak "mandatory argument fh is missing"; |
148 | |
296 | |
149 | AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
297 | AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
150 | |
298 | |
151 | $self->on_eof ((delete $self->{on_eof} ) or Carp::croak "mandatory argument on_eof is missing"); |
299 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}) |
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300 | if $self->{tls}; |
152 | |
301 | |
153 | $self->on_error (delete $self->{on_error}) if $self->{on_error}; |
302 | $self->{_activity} = AnyEvent->now; |
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303 | $self->_timeout; |
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304 | |
154 | $self->on_drain (delete $self->{on_drain}) if $self->{on_drain}; |
305 | $self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain}; |
155 | $self->on_read (delete $self->{on_read} ) if $self->{on_read}; |
306 | $self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay}; |
156 | |
307 | |
157 | $self->start_read; |
308 | $self->start_read |
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309 | if $self->{on_read}; |
158 | |
310 | |
159 | $self |
311 | $self |
160 | } |
312 | } |
161 | |
313 | |
162 | sub _shutdown { |
314 | sub _shutdown { |
163 | my ($self) = @_; |
315 | my ($self) = @_; |
164 | |
316 | |
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317 | delete $self->{_tw}; |
165 | delete $self->{rw}; |
318 | delete $self->{_rw}; |
166 | delete $self->{ww}; |
319 | delete $self->{_ww}; |
167 | delete $self->{fh}; |
320 | delete $self->{fh}; |
168 | } |
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169 | |
321 | |
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322 | &_freetls; |
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323 | |
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324 | delete $self->{on_read}; |
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325 | delete $self->{_queue}; |
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326 | } |
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327 | |
170 | sub error { |
328 | sub _error { |
171 | my ($self) = @_; |
329 | my ($self, $errno, $fatal) = @_; |
172 | |
330 | |
173 | { |
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174 | local $!; |
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175 | $self->_shutdown; |
331 | $self->_shutdown |
176 | } |
332 | if $fatal; |
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333 | |
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334 | $! = $errno; |
177 | |
335 | |
178 | if ($self->{on_error}) { |
336 | if ($self->{on_error}) { |
179 | $self->{on_error}($self); |
337 | $self->{on_error}($self, $fatal); |
180 | } else { |
338 | } elsif ($self->{fh}) { |
181 | die "AnyEvent::Handle uncaught fatal error: $!"; |
339 | Carp::croak "AnyEvent::Handle uncaught error: $!"; |
182 | } |
340 | } |
183 | } |
341 | } |
184 | |
342 | |
185 | =item $fh = $handle->fh |
343 | =item $fh = $handle->fh |
186 | |
344 | |
187 | This method returns the filehandle of the L<AnyEvent::Handle> object. |
345 | This method returns the file handle used to create the L<AnyEvent::Handle> object. |
188 | |
346 | |
189 | =cut |
347 | =cut |
190 | |
348 | |
191 | sub fh { $_[0]->{fh} } |
349 | sub fh { $_[0]{fh} } |
192 | |
350 | |
193 | =item $handle->on_error ($cb) |
351 | =item $handle->on_error ($cb) |
194 | |
352 | |
195 | Replace the current C<on_error> callback (see the C<on_error> constructor argument). |
353 | Replace the current C<on_error> callback (see the C<on_error> constructor argument). |
196 | |
354 | |
… | |
… | |
208 | |
366 | |
209 | sub on_eof { |
367 | sub on_eof { |
210 | $_[0]{on_eof} = $_[1]; |
368 | $_[0]{on_eof} = $_[1]; |
211 | } |
369 | } |
212 | |
370 | |
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371 | =item $handle->on_timeout ($cb) |
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372 | |
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373 | Replace the current C<on_timeout> callback, or disables the callback (but |
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374 | not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor |
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375 | argument and method. |
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376 | |
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377 | =cut |
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378 | |
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379 | sub on_timeout { |
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380 | $_[0]{on_timeout} = $_[1]; |
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381 | } |
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382 | |
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383 | =item $handle->autocork ($boolean) |
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384 | |
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385 | Enables or disables the current autocork behaviour (see C<autocork> |
|
|
386 | constructor argument). Changes will only take effect on the next write. |
|
|
387 | |
|
|
388 | =cut |
|
|
389 | |
|
|
390 | sub autocork { |
|
|
391 | $_[0]{autocork} = $_[1]; |
|
|
392 | } |
|
|
393 | |
|
|
394 | =item $handle->no_delay ($boolean) |
|
|
395 | |
|
|
396 | Enables or disables the C<no_delay> setting (see constructor argument of |
|
|
397 | the same name for details). |
|
|
398 | |
|
|
399 | =cut |
|
|
400 | |
|
|
401 | sub no_delay { |
|
|
402 | $_[0]{no_delay} = $_[1]; |
|
|
403 | |
|
|
404 | eval { |
|
|
405 | local $SIG{__DIE__}; |
|
|
406 | setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1]; |
|
|
407 | }; |
|
|
408 | } |
|
|
409 | |
|
|
410 | ############################################################################# |
|
|
411 | |
|
|
412 | =item $handle->timeout ($seconds) |
|
|
413 | |
|
|
414 | Configures (or disables) the inactivity timeout. |
|
|
415 | |
|
|
416 | =cut |
|
|
417 | |
|
|
418 | sub timeout { |
|
|
419 | my ($self, $timeout) = @_; |
|
|
420 | |
|
|
421 | $self->{timeout} = $timeout; |
|
|
422 | $self->_timeout; |
|
|
423 | } |
|
|
424 | |
|
|
425 | # reset the timeout watcher, as neccessary |
|
|
426 | # also check for time-outs |
|
|
427 | sub _timeout { |
|
|
428 | my ($self) = @_; |
|
|
429 | |
|
|
430 | if ($self->{timeout}) { |
|
|
431 | my $NOW = AnyEvent->now; |
|
|
432 | |
|
|
433 | # when would the timeout trigger? |
|
|
434 | my $after = $self->{_activity} + $self->{timeout} - $NOW; |
|
|
435 | |
|
|
436 | # now or in the past already? |
|
|
437 | if ($after <= 0) { |
|
|
438 | $self->{_activity} = $NOW; |
|
|
439 | |
|
|
440 | if ($self->{on_timeout}) { |
|
|
441 | $self->{on_timeout}($self); |
|
|
442 | } else { |
|
|
443 | $self->_error (&Errno::ETIMEDOUT); |
|
|
444 | } |
|
|
445 | |
|
|
446 | # callback could have changed timeout value, optimise |
|
|
447 | return unless $self->{timeout}; |
|
|
448 | |
|
|
449 | # calculate new after |
|
|
450 | $after = $self->{timeout}; |
|
|
451 | } |
|
|
452 | |
|
|
453 | Scalar::Util::weaken $self; |
|
|
454 | return unless $self; # ->error could have destroyed $self |
|
|
455 | |
|
|
456 | $self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub { |
|
|
457 | delete $self->{_tw}; |
|
|
458 | $self->_timeout; |
|
|
459 | }); |
|
|
460 | } else { |
|
|
461 | delete $self->{_tw}; |
|
|
462 | } |
|
|
463 | } |
|
|
464 | |
213 | ############################################################################# |
465 | ############################################################################# |
214 | |
466 | |
215 | =back |
467 | =back |
216 | |
468 | |
217 | =head2 WRITE QUEUE |
469 | =head2 WRITE QUEUE |
… | |
… | |
220 | for reading. |
472 | for reading. |
221 | |
473 | |
222 | The write queue is very simple: you can add data to its end, and |
474 | The write queue is very simple: you can add data to its end, and |
223 | AnyEvent::Handle will automatically try to get rid of it for you. |
475 | AnyEvent::Handle will automatically try to get rid of it for you. |
224 | |
476 | |
225 | When data could be writtena nd the write buffer is shorter then the low |
477 | When data could be written and the write buffer is shorter then the low |
226 | water mark, the C<on_drain> callback will be invoked. |
478 | water mark, the C<on_drain> callback will be invoked. |
227 | |
479 | |
228 | =over 4 |
480 | =over 4 |
229 | |
481 | |
230 | =item $handle->on_drain ($cb) |
482 | =item $handle->on_drain ($cb) |
… | |
… | |
238 | my ($self, $cb) = @_; |
490 | my ($self, $cb) = @_; |
239 | |
491 | |
240 | $self->{on_drain} = $cb; |
492 | $self->{on_drain} = $cb; |
241 | |
493 | |
242 | $cb->($self) |
494 | $cb->($self) |
243 | if $cb && $self->{low_water_mark} >= length $self->{wbuf}; |
495 | if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf}); |
244 | } |
496 | } |
245 | |
497 | |
246 | =item $handle->push_write ($data) |
498 | =item $handle->push_write ($data) |
247 | |
499 | |
248 | Queues the given scalar to be written. You can push as much data as you |
500 | Queues the given scalar to be written. You can push as much data as you |
249 | want (only limited by the available memory), as C<AnyEvent::Handle> |
501 | want (only limited by the available memory), as C<AnyEvent::Handle> |
250 | buffers it independently of the kernel. |
502 | buffers it independently of the kernel. |
251 | |
503 | |
252 | =cut |
504 | =cut |
253 | |
505 | |
254 | sub push_write { |
506 | sub _drain_wbuf { |
255 | my ($self, $data) = @_; |
507 | my ($self) = @_; |
256 | |
508 | |
257 | $self->{wbuf} .= $data; |
509 | if (!$self->{_ww} && length $self->{wbuf}) { |
258 | |
510 | |
259 | unless ($self->{ww}) { |
|
|
260 | Scalar::Util::weaken $self; |
511 | Scalar::Util::weaken $self; |
|
|
512 | |
261 | my $cb = sub { |
513 | my $cb = sub { |
262 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
514 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
263 | |
515 | |
264 | if ($len > 0) { |
516 | if ($len >= 0) { |
265 | substr $self->{wbuf}, 0, $len, ""; |
517 | substr $self->{wbuf}, 0, $len, ""; |
266 | |
518 | |
|
|
519 | $self->{_activity} = AnyEvent->now; |
267 | |
520 | |
268 | $self->{on_drain}($self) |
521 | $self->{on_drain}($self) |
269 | if $self->{low_water_mark} >= length $self->{wbuf} |
522 | if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf}) |
270 | && $self->{on_drain}; |
523 | && $self->{on_drain}; |
271 | |
524 | |
272 | delete $self->{ww} unless length $self->{wbuf}; |
525 | delete $self->{_ww} unless length $self->{wbuf}; |
273 | } elsif ($! != EAGAIN && $! != EINTR) { |
526 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
274 | $self->error; |
527 | $self->_error ($!, 1); |
275 | } |
528 | } |
276 | }; |
529 | }; |
277 | |
530 | |
|
|
531 | # try to write data immediately |
|
|
532 | $cb->() unless $self->{autocork}; |
|
|
533 | |
|
|
534 | # if still data left in wbuf, we need to poll |
278 | $self->{ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb); |
535 | $self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb) |
279 | |
536 | if length $self->{wbuf}; |
280 | $cb->($self); |
|
|
281 | }; |
537 | }; |
282 | } |
538 | } |
|
|
539 | |
|
|
540 | our %WH; |
|
|
541 | |
|
|
542 | sub register_write_type($$) { |
|
|
543 | $WH{$_[0]} = $_[1]; |
|
|
544 | } |
|
|
545 | |
|
|
546 | sub push_write { |
|
|
547 | my $self = shift; |
|
|
548 | |
|
|
549 | if (@_ > 1) { |
|
|
550 | my $type = shift; |
|
|
551 | |
|
|
552 | @_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write") |
|
|
553 | ->($self, @_); |
|
|
554 | } |
|
|
555 | |
|
|
556 | if ($self->{tls}) { |
|
|
557 | $self->{_tls_wbuf} .= $_[0]; |
|
|
558 | |
|
|
559 | &_dotls ($self); |
|
|
560 | } else { |
|
|
561 | $self->{wbuf} .= $_[0]; |
|
|
562 | $self->_drain_wbuf; |
|
|
563 | } |
|
|
564 | } |
|
|
565 | |
|
|
566 | =item $handle->push_write (type => @args) |
|
|
567 | |
|
|
568 | Instead of formatting your data yourself, you can also let this module do |
|
|
569 | the job by specifying a type and type-specific arguments. |
|
|
570 | |
|
|
571 | Predefined types are (if you have ideas for additional types, feel free to |
|
|
572 | drop by and tell us): |
|
|
573 | |
|
|
574 | =over 4 |
|
|
575 | |
|
|
576 | =item netstring => $string |
|
|
577 | |
|
|
578 | Formats the given value as netstring |
|
|
579 | (http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them). |
|
|
580 | |
|
|
581 | =cut |
|
|
582 | |
|
|
583 | register_write_type netstring => sub { |
|
|
584 | my ($self, $string) = @_; |
|
|
585 | |
|
|
586 | (length $string) . ":$string," |
|
|
587 | }; |
|
|
588 | |
|
|
589 | =item packstring => $format, $data |
|
|
590 | |
|
|
591 | An octet string prefixed with an encoded length. The encoding C<$format> |
|
|
592 | uses the same format as a Perl C<pack> format, but must specify a single |
|
|
593 | integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an |
|
|
594 | optional C<!>, C<< < >> or C<< > >> modifier). |
|
|
595 | |
|
|
596 | =cut |
|
|
597 | |
|
|
598 | register_write_type packstring => sub { |
|
|
599 | my ($self, $format, $string) = @_; |
|
|
600 | |
|
|
601 | pack "$format/a*", $string |
|
|
602 | }; |
|
|
603 | |
|
|
604 | =item json => $array_or_hashref |
|
|
605 | |
|
|
606 | Encodes the given hash or array reference into a JSON object. Unless you |
|
|
607 | provide your own JSON object, this means it will be encoded to JSON text |
|
|
608 | in UTF-8. |
|
|
609 | |
|
|
610 | JSON objects (and arrays) are self-delimiting, so you can write JSON at |
|
|
611 | one end of a handle and read them at the other end without using any |
|
|
612 | additional framing. |
|
|
613 | |
|
|
614 | The generated JSON text is guaranteed not to contain any newlines: While |
|
|
615 | this module doesn't need delimiters after or between JSON texts to be |
|
|
616 | able to read them, many other languages depend on that. |
|
|
617 | |
|
|
618 | A simple RPC protocol that interoperates easily with others is to send |
|
|
619 | JSON arrays (or objects, although arrays are usually the better choice as |
|
|
620 | they mimic how function argument passing works) and a newline after each |
|
|
621 | JSON text: |
|
|
622 | |
|
|
623 | $handle->push_write (json => ["method", "arg1", "arg2"]); # whatever |
|
|
624 | $handle->push_write ("\012"); |
|
|
625 | |
|
|
626 | An AnyEvent::Handle receiver would simply use the C<json> read type and |
|
|
627 | rely on the fact that the newline will be skipped as leading whitespace: |
|
|
628 | |
|
|
629 | $handle->push_read (json => sub { my $array = $_[1]; ... }); |
|
|
630 | |
|
|
631 | Other languages could read single lines terminated by a newline and pass |
|
|
632 | this line into their JSON decoder of choice. |
|
|
633 | |
|
|
634 | =cut |
|
|
635 | |
|
|
636 | register_write_type json => sub { |
|
|
637 | my ($self, $ref) = @_; |
|
|
638 | |
|
|
639 | require JSON; |
|
|
640 | |
|
|
641 | $self->{json} ? $self->{json}->encode ($ref) |
|
|
642 | : JSON::encode_json ($ref) |
|
|
643 | }; |
|
|
644 | |
|
|
645 | =item storable => $reference |
|
|
646 | |
|
|
647 | Freezes the given reference using L<Storable> and writes it to the |
|
|
648 | handle. Uses the C<nfreeze> format. |
|
|
649 | |
|
|
650 | =cut |
|
|
651 | |
|
|
652 | register_write_type storable => sub { |
|
|
653 | my ($self, $ref) = @_; |
|
|
654 | |
|
|
655 | require Storable; |
|
|
656 | |
|
|
657 | pack "w/a*", Storable::nfreeze ($ref) |
|
|
658 | }; |
|
|
659 | |
|
|
660 | =back |
|
|
661 | |
|
|
662 | =item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args) |
|
|
663 | |
|
|
664 | This function (not method) lets you add your own types to C<push_write>. |
|
|
665 | Whenever the given C<type> is used, C<push_write> will invoke the code |
|
|
666 | reference with the handle object and the remaining arguments. |
|
|
667 | |
|
|
668 | The code reference is supposed to return a single octet string that will |
|
|
669 | be appended to the write buffer. |
|
|
670 | |
|
|
671 | Note that this is a function, and all types registered this way will be |
|
|
672 | global, so try to use unique names. |
|
|
673 | |
|
|
674 | =cut |
283 | |
675 | |
284 | ############################################################################# |
676 | ############################################################################# |
285 | |
677 | |
286 | =back |
678 | =back |
287 | |
679 | |
… | |
… | |
294 | ways, the "simple" way, using only C<on_read> and the "complex" way, using |
686 | ways, the "simple" way, using only C<on_read> and the "complex" way, using |
295 | a queue. |
687 | a queue. |
296 | |
688 | |
297 | In the simple case, you just install an C<on_read> callback and whenever |
689 | In the simple case, you just install an C<on_read> callback and whenever |
298 | new data arrives, it will be called. You can then remove some data (if |
690 | new data arrives, it will be called. You can then remove some data (if |
299 | enough is there) from the read buffer (C<< $handle->rbuf >>) if you want |
691 | enough is there) from the read buffer (C<< $handle->rbuf >>). Or you cna |
300 | or not. |
692 | leave the data there if you want to accumulate more (e.g. when only a |
|
|
693 | partial message has been received so far). |
301 | |
694 | |
302 | In the more complex case, you want to queue multiple callbacks. In this |
695 | In the more complex case, you want to queue multiple callbacks. In this |
303 | case, AnyEvent::Handle will call the first queued callback each time new |
696 | case, AnyEvent::Handle will call the first queued callback each time new |
304 | data arrives and removes it when it has done its job (see C<push_read>, |
697 | data arrives (also the first time it is queued) and removes it when it has |
305 | below). |
698 | done its job (see C<push_read>, below). |
306 | |
699 | |
307 | This way you can, for example, push three line-reads, followed by reading |
700 | This way you can, for example, push three line-reads, followed by reading |
308 | a chunk of data, and AnyEvent::Handle will execute them in order. |
701 | a chunk of data, and AnyEvent::Handle will execute them in order. |
309 | |
702 | |
310 | Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by |
703 | Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by |
311 | the specified number of bytes which give an XML datagram. |
704 | the specified number of bytes which give an XML datagram. |
312 | |
705 | |
313 | # in the default state, expect some header bytes |
706 | # in the default state, expect some header bytes |
314 | $handle->on_read (sub { |
707 | $handle->on_read (sub { |
315 | # some data is here, now queue the length-header-read (4 octets) |
708 | # some data is here, now queue the length-header-read (4 octets) |
316 | shift->unshift_read_chunk (4, sub { |
709 | shift->unshift_read (chunk => 4, sub { |
317 | # header arrived, decode |
710 | # header arrived, decode |
318 | my $len = unpack "N", $_[1]; |
711 | my $len = unpack "N", $_[1]; |
319 | |
712 | |
320 | # now read the payload |
713 | # now read the payload |
321 | shift->unshift_read_chunk ($len, sub { |
714 | shift->unshift_read (chunk => $len, sub { |
322 | my $xml = $_[1]; |
715 | my $xml = $_[1]; |
323 | # handle xml |
716 | # handle xml |
324 | }); |
717 | }); |
325 | }); |
718 | }); |
326 | }); |
719 | }); |
327 | |
720 | |
328 | Example 2: Implement a client for a protocol that replies either with |
721 | Example 2: Implement a client for a protocol that replies either with "OK" |
329 | "OK" and another line or "ERROR" for one request, and 64 bytes for the |
722 | and another line or "ERROR" for the first request that is sent, and 64 |
330 | second request. Due tot he availability of a full queue, we can just |
723 | bytes for the second request. Due to the availability of a queue, we can |
331 | pipeline sending both requests and manipulate the queue as necessary in |
724 | just pipeline sending both requests and manipulate the queue as necessary |
332 | the callbacks: |
725 | in the callbacks. |
333 | |
726 | |
334 | # request one |
727 | When the first callback is called and sees an "OK" response, it will |
|
|
728 | C<unshift> another line-read. This line-read will be queued I<before> the |
|
|
729 | 64-byte chunk callback. |
|
|
730 | |
|
|
731 | # request one, returns either "OK + extra line" or "ERROR" |
335 | $handle->push_write ("request 1\015\012"); |
732 | $handle->push_write ("request 1\015\012"); |
336 | |
733 | |
337 | # we expect "ERROR" or "OK" as response, so push a line read |
734 | # we expect "ERROR" or "OK" as response, so push a line read |
338 | $handle->push_read_line (sub { |
735 | $handle->push_read (line => sub { |
339 | # if we got an "OK", we have to _prepend_ another line, |
736 | # if we got an "OK", we have to _prepend_ another line, |
340 | # so it will be read before the second request reads its 64 bytes |
737 | # so it will be read before the second request reads its 64 bytes |
341 | # which are already in the queue when this callback is called |
738 | # which are already in the queue when this callback is called |
342 | # we don't do this in case we got an error |
739 | # we don't do this in case we got an error |
343 | if ($_[1] eq "OK") { |
740 | if ($_[1] eq "OK") { |
344 | $_[0]->unshift_read_line (sub { |
741 | $_[0]->unshift_read (line => sub { |
345 | my $response = $_[1]; |
742 | my $response = $_[1]; |
346 | ... |
743 | ... |
347 | }); |
744 | }); |
348 | } |
745 | } |
349 | }); |
746 | }); |
350 | |
747 | |
351 | # request two |
748 | # request two, simply returns 64 octets |
352 | $handle->push_write ("request 2\015\012"); |
749 | $handle->push_write ("request 2\015\012"); |
353 | |
750 | |
354 | # simply read 64 bytes, always |
751 | # simply read 64 bytes, always |
355 | $handle->push_read_chunk (64, sub { |
752 | $handle->push_read (chunk => 64, sub { |
356 | my $response = $_[1]; |
753 | my $response = $_[1]; |
357 | ... |
754 | ... |
358 | }); |
755 | }); |
359 | |
756 | |
360 | =over 4 |
757 | =over 4 |
… | |
… | |
362 | =cut |
759 | =cut |
363 | |
760 | |
364 | sub _drain_rbuf { |
761 | sub _drain_rbuf { |
365 | my ($self) = @_; |
762 | my ($self) = @_; |
366 | |
763 | |
367 | return if exists $self->{in_drain}; |
|
|
368 | local $self->{in_drain} = 1; |
764 | local $self->{_in_drain} = 1; |
369 | |
765 | |
|
|
766 | if ( |
|
|
767 | defined $self->{rbuf_max} |
|
|
768 | && $self->{rbuf_max} < length $self->{rbuf} |
|
|
769 | ) { |
|
|
770 | $self->_error (&Errno::ENOSPC, 1), return; |
|
|
771 | } |
|
|
772 | |
|
|
773 | while () { |
|
|
774 | # we need to use a separate tls read buffer, as we must not receive data while |
|
|
775 | # we are draining the buffer, and this can only happen with TLS. |
|
|
776 | $self->{rbuf} .= delete $self->{_tls_rbuf} if exists $self->{_tls_rbuf}; |
|
|
777 | |
370 | while (my $len = length $self->{rbuf}) { |
778 | my $len = length $self->{rbuf}; |
371 | no strict 'refs'; |
779 | |
372 | if (my $cb = shift @{ $self->{queue} }) { |
780 | if (my $cb = shift @{ $self->{_queue} }) { |
373 | if (!$cb->($self)) { |
781 | unless ($cb->($self)) { |
374 | if ($self->{eof}) { |
782 | if ($self->{_eof}) { |
375 | # no progress can be made (not enough data and no data forthcoming) |
783 | # no progress can be made (not enough data and no data forthcoming) |
376 | $! = &Errno::EPIPE; return $self->error; |
784 | $self->_error (&Errno::EPIPE, 1), return; |
377 | } |
785 | } |
378 | |
786 | |
379 | unshift @{ $self->{queue} }, $cb; |
787 | unshift @{ $self->{_queue} }, $cb; |
380 | return; |
788 | last; |
381 | } |
789 | } |
382 | } elsif ($self->{on_read}) { |
790 | } elsif ($self->{on_read}) { |
|
|
791 | last unless $len; |
|
|
792 | |
383 | $self->{on_read}($self); |
793 | $self->{on_read}($self); |
384 | |
794 | |
385 | if ( |
795 | if ( |
386 | $self->{eof} # if no further data will arrive |
|
|
387 | && $len == length $self->{rbuf} # and no data has been consumed |
796 | $len == length $self->{rbuf} # if no data has been consumed |
388 | && !@{ $self->{queue} } # and the queue is still empty |
797 | && !@{ $self->{_queue} } # and the queue is still empty |
389 | && $self->{on_read} # and we still want to read data |
798 | && $self->{on_read} # but we still have on_read |
390 | ) { |
799 | ) { |
|
|
800 | # no further data will arrive |
391 | # then no progress can be made |
801 | # so no progress can be made |
392 | $! = &Errno::EPIPE; return $self->error; |
802 | $self->_error (&Errno::EPIPE, 1), return |
|
|
803 | if $self->{_eof}; |
|
|
804 | |
|
|
805 | last; # more data might arrive |
393 | } |
806 | } |
394 | } else { |
807 | } else { |
395 | # read side becomes idle |
808 | # read side becomes idle |
396 | delete $self->{rw}; |
809 | delete $self->{_rw} unless $self->{tls}; |
397 | return; |
810 | last; |
398 | } |
811 | } |
399 | } |
812 | } |
400 | |
813 | |
401 | if ($self->{eof}) { |
814 | if ($self->{_eof}) { |
402 | $self->_shutdown; |
815 | if ($self->{on_eof}) { |
403 | $self->{on_eof}($self); |
816 | $self->{on_eof}($self) |
|
|
817 | } else { |
|
|
818 | $self->_error (0, 1); |
|
|
819 | } |
|
|
820 | } |
|
|
821 | |
|
|
822 | # may need to restart read watcher |
|
|
823 | unless ($self->{_rw}) { |
|
|
824 | $self->start_read |
|
|
825 | if $self->{on_read} || @{ $self->{_queue} }; |
404 | } |
826 | } |
405 | } |
827 | } |
406 | |
828 | |
407 | =item $handle->on_read ($cb) |
829 | =item $handle->on_read ($cb) |
408 | |
830 | |
… | |
… | |
414 | |
836 | |
415 | sub on_read { |
837 | sub on_read { |
416 | my ($self, $cb) = @_; |
838 | my ($self, $cb) = @_; |
417 | |
839 | |
418 | $self->{on_read} = $cb; |
840 | $self->{on_read} = $cb; |
|
|
841 | $self->_drain_rbuf if $cb && !$self->{_in_drain}; |
419 | } |
842 | } |
420 | |
843 | |
421 | =item $handle->rbuf |
844 | =item $handle->rbuf |
422 | |
845 | |
423 | Returns the read buffer (as a modifiable lvalue). |
846 | Returns the read buffer (as a modifiable lvalue). |
424 | |
847 | |
425 | You can access the read buffer directly as the C<< ->{rbuf} >> member, if |
848 | You can access the read buffer directly as the C<< ->{rbuf} >> |
426 | you want. |
849 | member, if you want. However, the only operation allowed on the |
|
|
850 | read buffer (apart from looking at it) is removing data from its |
|
|
851 | beginning. Otherwise modifying or appending to it is not allowed and will |
|
|
852 | lead to hard-to-track-down bugs. |
427 | |
853 | |
428 | NOTE: The read buffer should only be used or modified if the C<on_read>, |
854 | NOTE: The read buffer should only be used or modified if the C<on_read>, |
429 | C<push_read> or C<unshift_read> methods are used. The other read methods |
855 | C<push_read> or C<unshift_read> methods are used. The other read methods |
430 | automatically manage the read buffer. |
856 | automatically manage the read buffer. |
431 | |
857 | |
… | |
… | |
442 | Append the given callback to the end of the queue (C<push_read>) or |
868 | Append the given callback to the end of the queue (C<push_read>) or |
443 | prepend it (C<unshift_read>). |
869 | prepend it (C<unshift_read>). |
444 | |
870 | |
445 | The callback is called each time some additional read data arrives. |
871 | The callback is called each time some additional read data arrives. |
446 | |
872 | |
447 | It must check wether enough data is in the read buffer already. |
873 | It must check whether enough data is in the read buffer already. |
448 | |
874 | |
449 | If not enough data is available, it must return the empty list or a false |
875 | If not enough data is available, it must return the empty list or a false |
450 | value, in which case it will be called repeatedly until enough data is |
876 | value, in which case it will be called repeatedly until enough data is |
451 | available (or an error condition is detected). |
877 | available (or an error condition is detected). |
452 | |
878 | |
… | |
… | |
454 | interested in (which can be none at all) and return a true value. After returning |
880 | interested in (which can be none at all) and return a true value. After returning |
455 | true, it will be removed from the queue. |
881 | true, it will be removed from the queue. |
456 | |
882 | |
457 | =cut |
883 | =cut |
458 | |
884 | |
|
|
885 | our %RH; |
|
|
886 | |
|
|
887 | sub register_read_type($$) { |
|
|
888 | $RH{$_[0]} = $_[1]; |
|
|
889 | } |
|
|
890 | |
459 | sub push_read { |
891 | sub push_read { |
460 | my ($self, $cb) = @_; |
892 | my $self = shift; |
|
|
893 | my $cb = pop; |
461 | |
894 | |
|
|
895 | if (@_) { |
|
|
896 | my $type = shift; |
|
|
897 | |
|
|
898 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read") |
|
|
899 | ->($self, $cb, @_); |
|
|
900 | } |
|
|
901 | |
462 | push @{ $self->{queue} }, $cb; |
902 | push @{ $self->{_queue} }, $cb; |
463 | $self->_drain_rbuf; |
903 | $self->_drain_rbuf unless $self->{_in_drain}; |
464 | } |
904 | } |
465 | |
905 | |
466 | sub unshift_read { |
906 | sub unshift_read { |
467 | my ($self, $cb) = @_; |
907 | my $self = shift; |
|
|
908 | my $cb = pop; |
468 | |
909 | |
|
|
910 | if (@_) { |
|
|
911 | my $type = shift; |
|
|
912 | |
|
|
913 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read") |
|
|
914 | ->($self, $cb, @_); |
|
|
915 | } |
|
|
916 | |
|
|
917 | |
469 | push @{ $self->{queue} }, $cb; |
918 | unshift @{ $self->{_queue} }, $cb; |
470 | $self->_drain_rbuf; |
919 | $self->_drain_rbuf unless $self->{_in_drain}; |
471 | } |
920 | } |
472 | |
921 | |
473 | =item $handle->push_read_chunk ($len, $cb->($self, $data)) |
922 | =item $handle->push_read (type => @args, $cb) |
474 | |
923 | |
475 | =item $handle->unshift_read_chunk ($len, $cb->($self, $data)) |
924 | =item $handle->unshift_read (type => @args, $cb) |
476 | |
925 | |
477 | Append the given callback to the end of the queue (C<push_read_chunk>) or |
926 | Instead of providing a callback that parses the data itself you can chose |
478 | prepend it (C<unshift_read_chunk>). |
927 | between a number of predefined parsing formats, for chunks of data, lines |
|
|
928 | etc. |
479 | |
929 | |
480 | The callback will be called only once C<$len> bytes have been read, and |
930 | Predefined types are (if you have ideas for additional types, feel free to |
481 | these C<$len> bytes will be passed to the callback. |
931 | drop by and tell us): |
482 | |
932 | |
483 | =cut |
933 | =over 4 |
484 | |
934 | |
485 | sub _read_chunk($$) { |
935 | =item chunk => $octets, $cb->($handle, $data) |
|
|
936 | |
|
|
937 | Invoke the callback only once C<$octets> bytes have been read. Pass the |
|
|
938 | data read to the callback. The callback will never be called with less |
|
|
939 | data. |
|
|
940 | |
|
|
941 | Example: read 2 bytes. |
|
|
942 | |
|
|
943 | $handle->push_read (chunk => 2, sub { |
|
|
944 | warn "yay ", unpack "H*", $_[1]; |
|
|
945 | }); |
|
|
946 | |
|
|
947 | =cut |
|
|
948 | |
|
|
949 | register_read_type chunk => sub { |
486 | my ($self, $len, $cb) = @_; |
950 | my ($self, $cb, $len) = @_; |
487 | |
951 | |
488 | sub { |
952 | sub { |
489 | $len <= length $_[0]{rbuf} or return; |
953 | $len <= length $_[0]{rbuf} or return; |
490 | $cb->($self, $_[0], substr $_[0]{rbuf}, 0, $len, ""); |
954 | $cb->($_[0], substr $_[0]{rbuf}, 0, $len, ""); |
491 | 1 |
955 | 1 |
492 | } |
956 | } |
493 | } |
957 | }; |
494 | |
958 | |
495 | sub push_read_chunk { |
959 | =item line => [$eol, ]$cb->($handle, $line, $eol) |
496 | $_[0]->push_read (&_read_chunk); |
|
|
497 | } |
|
|
498 | |
|
|
499 | |
|
|
500 | sub unshift_read_chunk { |
|
|
501 | $_[0]->unshift_read (&_read_chunk); |
|
|
502 | } |
|
|
503 | |
|
|
504 | =item $handle->push_read_line ([$eol, ]$cb->($self, $line, $eol)) |
|
|
505 | |
|
|
506 | =item $handle->unshift_read_line ([$eol, ]$cb->($self, $line, $eol)) |
|
|
507 | |
|
|
508 | Append the given callback to the end of the queue (C<push_read_line>) or |
|
|
509 | prepend it (C<unshift_read_line>). |
|
|
510 | |
960 | |
511 | The callback will be called only once a full line (including the end of |
961 | The callback will be called only once a full line (including the end of |
512 | line marker, C<$eol>) has been read. This line (excluding the end of line |
962 | line marker, C<$eol>) has been read. This line (excluding the end of line |
513 | marker) will be passed to the callback as second argument (C<$line>), and |
963 | marker) will be passed to the callback as second argument (C<$line>), and |
514 | the end of line marker as the third argument (C<$eol>). |
964 | the end of line marker as the third argument (C<$eol>). |
… | |
… | |
525 | Partial lines at the end of the stream will never be returned, as they are |
975 | Partial lines at the end of the stream will never be returned, as they are |
526 | not marked by the end of line marker. |
976 | not marked by the end of line marker. |
527 | |
977 | |
528 | =cut |
978 | =cut |
529 | |
979 | |
530 | sub _read_line($$) { |
980 | register_read_type line => sub { |
531 | my $self = shift; |
981 | my ($self, $cb, $eol) = @_; |
532 | my $cb = pop; |
|
|
533 | my $eol = @_ ? shift : qr|(\015?\012)|; |
|
|
534 | my $pos; |
|
|
535 | |
982 | |
|
|
983 | if (@_ < 3) { |
|
|
984 | # this is more than twice as fast as the generic code below |
|
|
985 | sub { |
|
|
986 | $_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return; |
|
|
987 | |
|
|
988 | $cb->($_[0], $1, $2); |
|
|
989 | 1 |
|
|
990 | } |
|
|
991 | } else { |
536 | $eol = qr|(\Q$eol\E)| unless ref $eol; |
992 | $eol = quotemeta $eol unless ref $eol; |
537 | $eol = qr|^(.*?)($eol)|; |
993 | $eol = qr|^(.*?)($eol)|s; |
|
|
994 | |
|
|
995 | sub { |
|
|
996 | $_[0]{rbuf} =~ s/$eol// or return; |
|
|
997 | |
|
|
998 | $cb->($_[0], $1, $2); |
|
|
999 | 1 |
|
|
1000 | } |
|
|
1001 | } |
|
|
1002 | }; |
|
|
1003 | |
|
|
1004 | =item regex => $accept[, $reject[, $skip], $cb->($handle, $data) |
|
|
1005 | |
|
|
1006 | Makes a regex match against the regex object C<$accept> and returns |
|
|
1007 | everything up to and including the match. |
|
|
1008 | |
|
|
1009 | Example: read a single line terminated by '\n'. |
|
|
1010 | |
|
|
1011 | $handle->push_read (regex => qr<\n>, sub { ... }); |
|
|
1012 | |
|
|
1013 | If C<$reject> is given and not undef, then it determines when the data is |
|
|
1014 | to be rejected: it is matched against the data when the C<$accept> regex |
|
|
1015 | does not match and generates an C<EBADMSG> error when it matches. This is |
|
|
1016 | useful to quickly reject wrong data (to avoid waiting for a timeout or a |
|
|
1017 | receive buffer overflow). |
|
|
1018 | |
|
|
1019 | Example: expect a single decimal number followed by whitespace, reject |
|
|
1020 | anything else (not the use of an anchor). |
|
|
1021 | |
|
|
1022 | $handle->push_read (regex => qr<^[0-9]+\s>, qr<[^0-9]>, sub { ... }); |
|
|
1023 | |
|
|
1024 | If C<$skip> is given and not C<undef>, then it will be matched against |
|
|
1025 | the receive buffer when neither C<$accept> nor C<$reject> match, |
|
|
1026 | and everything preceding and including the match will be accepted |
|
|
1027 | unconditionally. This is useful to skip large amounts of data that you |
|
|
1028 | know cannot be matched, so that the C<$accept> or C<$reject> regex do not |
|
|
1029 | have to start matching from the beginning. This is purely an optimisation |
|
|
1030 | and is usually worth only when you expect more than a few kilobytes. |
|
|
1031 | |
|
|
1032 | Example: expect a http header, which ends at C<\015\012\015\012>. Since we |
|
|
1033 | expect the header to be very large (it isn't in practise, but...), we use |
|
|
1034 | a skip regex to skip initial portions. The skip regex is tricky in that |
|
|
1035 | it only accepts something not ending in either \015 or \012, as these are |
|
|
1036 | required for the accept regex. |
|
|
1037 | |
|
|
1038 | $handle->push_read (regex => |
|
|
1039 | qr<\015\012\015\012>, |
|
|
1040 | undef, # no reject |
|
|
1041 | qr<^.*[^\015\012]>, |
|
|
1042 | sub { ... }); |
|
|
1043 | |
|
|
1044 | =cut |
|
|
1045 | |
|
|
1046 | register_read_type regex => sub { |
|
|
1047 | my ($self, $cb, $accept, $reject, $skip) = @_; |
|
|
1048 | |
|
|
1049 | my $data; |
|
|
1050 | my $rbuf = \$self->{rbuf}; |
538 | |
1051 | |
539 | sub { |
1052 | sub { |
540 | $_[0]{rbuf} =~ s/$eol// or return; |
1053 | # accept |
541 | |
1054 | if ($$rbuf =~ $accept) { |
|
|
1055 | $data .= substr $$rbuf, 0, $+[0], ""; |
542 | $cb->($self, $1, $2); |
1056 | $cb->($self, $data); |
|
|
1057 | return 1; |
|
|
1058 | } |
|
|
1059 | |
|
|
1060 | # reject |
|
|
1061 | if ($reject && $$rbuf =~ $reject) { |
|
|
1062 | $self->_error (&Errno::EBADMSG); |
|
|
1063 | } |
|
|
1064 | |
|
|
1065 | # skip |
|
|
1066 | if ($skip && $$rbuf =~ $skip) { |
|
|
1067 | $data .= substr $$rbuf, 0, $+[0], ""; |
|
|
1068 | } |
|
|
1069 | |
|
|
1070 | () |
|
|
1071 | } |
|
|
1072 | }; |
|
|
1073 | |
|
|
1074 | =item netstring => $cb->($handle, $string) |
|
|
1075 | |
|
|
1076 | A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement). |
|
|
1077 | |
|
|
1078 | Throws an error with C<$!> set to EBADMSG on format violations. |
|
|
1079 | |
|
|
1080 | =cut |
|
|
1081 | |
|
|
1082 | register_read_type netstring => sub { |
|
|
1083 | my ($self, $cb) = @_; |
|
|
1084 | |
|
|
1085 | sub { |
|
|
1086 | unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) { |
|
|
1087 | if ($_[0]{rbuf} =~ /[^0-9]/) { |
|
|
1088 | $self->_error (&Errno::EBADMSG); |
|
|
1089 | } |
|
|
1090 | return; |
|
|
1091 | } |
|
|
1092 | |
|
|
1093 | my $len = $1; |
|
|
1094 | |
|
|
1095 | $self->unshift_read (chunk => $len, sub { |
|
|
1096 | my $string = $_[1]; |
|
|
1097 | $_[0]->unshift_read (chunk => 1, sub { |
|
|
1098 | if ($_[1] eq ",") { |
|
|
1099 | $cb->($_[0], $string); |
|
|
1100 | } else { |
|
|
1101 | $self->_error (&Errno::EBADMSG); |
|
|
1102 | } |
|
|
1103 | }); |
|
|
1104 | }); |
|
|
1105 | |
543 | 1 |
1106 | 1 |
544 | } |
1107 | } |
545 | } |
1108 | }; |
546 | |
1109 | |
547 | sub push_read_line { |
1110 | =item packstring => $format, $cb->($handle, $string) |
548 | $_[0]->push_read (&_read_line); |
|
|
549 | } |
|
|
550 | |
1111 | |
551 | sub unshift_read_line { |
1112 | An octet string prefixed with an encoded length. The encoding C<$format> |
552 | $_[0]->unshift_read (&_read_line); |
1113 | uses the same format as a Perl C<pack> format, but must specify a single |
553 | } |
1114 | integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an |
|
|
1115 | optional C<!>, C<< < >> or C<< > >> modifier). |
|
|
1116 | |
|
|
1117 | For example, DNS over TCP uses a prefix of C<n> (2 octet network order), |
|
|
1118 | EPP uses a prefix of C<N> (4 octtes). |
|
|
1119 | |
|
|
1120 | Example: read a block of data prefixed by its length in BER-encoded |
|
|
1121 | format (very efficient). |
|
|
1122 | |
|
|
1123 | $handle->push_read (packstring => "w", sub { |
|
|
1124 | my ($handle, $data) = @_; |
|
|
1125 | }); |
|
|
1126 | |
|
|
1127 | =cut |
|
|
1128 | |
|
|
1129 | register_read_type packstring => sub { |
|
|
1130 | my ($self, $cb, $format) = @_; |
|
|
1131 | |
|
|
1132 | sub { |
|
|
1133 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
|
|
1134 | defined (my $len = eval { unpack $format, $_[0]{rbuf} }) |
|
|
1135 | or return; |
|
|
1136 | |
|
|
1137 | $format = length pack $format, $len; |
|
|
1138 | |
|
|
1139 | # bypass unshift if we already have the remaining chunk |
|
|
1140 | if ($format + $len <= length $_[0]{rbuf}) { |
|
|
1141 | my $data = substr $_[0]{rbuf}, $format, $len; |
|
|
1142 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
|
|
1143 | $cb->($_[0], $data); |
|
|
1144 | } else { |
|
|
1145 | # remove prefix |
|
|
1146 | substr $_[0]{rbuf}, 0, $format, ""; |
|
|
1147 | |
|
|
1148 | # read remaining chunk |
|
|
1149 | $_[0]->unshift_read (chunk => $len, $cb); |
|
|
1150 | } |
|
|
1151 | |
|
|
1152 | 1 |
|
|
1153 | } |
|
|
1154 | }; |
|
|
1155 | |
|
|
1156 | =item json => $cb->($handle, $hash_or_arrayref) |
|
|
1157 | |
|
|
1158 | Reads a JSON object or array, decodes it and passes it to the |
|
|
1159 | callback. When a parse error occurs, an C<EBADMSG> error will be raised. |
|
|
1160 | |
|
|
1161 | If a C<json> object was passed to the constructor, then that will be used |
|
|
1162 | for the final decode, otherwise it will create a JSON coder expecting UTF-8. |
|
|
1163 | |
|
|
1164 | This read type uses the incremental parser available with JSON version |
|
|
1165 | 2.09 (and JSON::XS version 2.2) and above. You have to provide a |
|
|
1166 | dependency on your own: this module will load the JSON module, but |
|
|
1167 | AnyEvent does not depend on it itself. |
|
|
1168 | |
|
|
1169 | Since JSON texts are fully self-delimiting, the C<json> read and write |
|
|
1170 | types are an ideal simple RPC protocol: just exchange JSON datagrams. See |
|
|
1171 | the C<json> write type description, above, for an actual example. |
|
|
1172 | |
|
|
1173 | =cut |
|
|
1174 | |
|
|
1175 | register_read_type json => sub { |
|
|
1176 | my ($self, $cb) = @_; |
|
|
1177 | |
|
|
1178 | require JSON; |
|
|
1179 | |
|
|
1180 | my $data; |
|
|
1181 | my $rbuf = \$self->{rbuf}; |
|
|
1182 | |
|
|
1183 | my $json = $self->{json} ||= JSON->new->utf8; |
|
|
1184 | |
|
|
1185 | sub { |
|
|
1186 | my $ref = eval { $json->incr_parse ($self->{rbuf}) }; |
|
|
1187 | |
|
|
1188 | if ($ref) { |
|
|
1189 | $self->{rbuf} = $json->incr_text; |
|
|
1190 | $json->incr_text = ""; |
|
|
1191 | $cb->($self, $ref); |
|
|
1192 | |
|
|
1193 | 1 |
|
|
1194 | } elsif ($@) { |
|
|
1195 | # error case |
|
|
1196 | $json->incr_skip; |
|
|
1197 | |
|
|
1198 | $self->{rbuf} = $json->incr_text; |
|
|
1199 | $json->incr_text = ""; |
|
|
1200 | |
|
|
1201 | $self->_error (&Errno::EBADMSG); |
|
|
1202 | |
|
|
1203 | () |
|
|
1204 | } else { |
|
|
1205 | $self->{rbuf} = ""; |
|
|
1206 | |
|
|
1207 | () |
|
|
1208 | } |
|
|
1209 | } |
|
|
1210 | }; |
|
|
1211 | |
|
|
1212 | =item storable => $cb->($handle, $ref) |
|
|
1213 | |
|
|
1214 | Deserialises a L<Storable> frozen representation as written by the |
|
|
1215 | C<storable> write type (BER-encoded length prefix followed by nfreeze'd |
|
|
1216 | data). |
|
|
1217 | |
|
|
1218 | Raises C<EBADMSG> error if the data could not be decoded. |
|
|
1219 | |
|
|
1220 | =cut |
|
|
1221 | |
|
|
1222 | register_read_type storable => sub { |
|
|
1223 | my ($self, $cb) = @_; |
|
|
1224 | |
|
|
1225 | require Storable; |
|
|
1226 | |
|
|
1227 | sub { |
|
|
1228 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
|
|
1229 | defined (my $len = eval { unpack "w", $_[0]{rbuf} }) |
|
|
1230 | or return; |
|
|
1231 | |
|
|
1232 | my $format = length pack "w", $len; |
|
|
1233 | |
|
|
1234 | # bypass unshift if we already have the remaining chunk |
|
|
1235 | if ($format + $len <= length $_[0]{rbuf}) { |
|
|
1236 | my $data = substr $_[0]{rbuf}, $format, $len; |
|
|
1237 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
|
|
1238 | $cb->($_[0], Storable::thaw ($data)); |
|
|
1239 | } else { |
|
|
1240 | # remove prefix |
|
|
1241 | substr $_[0]{rbuf}, 0, $format, ""; |
|
|
1242 | |
|
|
1243 | # read remaining chunk |
|
|
1244 | $_[0]->unshift_read (chunk => $len, sub { |
|
|
1245 | if (my $ref = eval { Storable::thaw ($_[1]) }) { |
|
|
1246 | $cb->($_[0], $ref); |
|
|
1247 | } else { |
|
|
1248 | $self->_error (&Errno::EBADMSG); |
|
|
1249 | } |
|
|
1250 | }); |
|
|
1251 | } |
|
|
1252 | |
|
|
1253 | 1 |
|
|
1254 | } |
|
|
1255 | }; |
|
|
1256 | |
|
|
1257 | =back |
|
|
1258 | |
|
|
1259 | =item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args) |
|
|
1260 | |
|
|
1261 | This function (not method) lets you add your own types to C<push_read>. |
|
|
1262 | |
|
|
1263 | Whenever the given C<type> is used, C<push_read> will invoke the code |
|
|
1264 | reference with the handle object, the callback and the remaining |
|
|
1265 | arguments. |
|
|
1266 | |
|
|
1267 | The code reference is supposed to return a callback (usually a closure) |
|
|
1268 | that works as a plain read callback (see C<< ->push_read ($cb) >>). |
|
|
1269 | |
|
|
1270 | It should invoke the passed callback when it is done reading (remember to |
|
|
1271 | pass C<$handle> as first argument as all other callbacks do that). |
|
|
1272 | |
|
|
1273 | Note that this is a function, and all types registered this way will be |
|
|
1274 | global, so try to use unique names. |
|
|
1275 | |
|
|
1276 | For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>, |
|
|
1277 | search for C<register_read_type>)). |
554 | |
1278 | |
555 | =item $handle->stop_read |
1279 | =item $handle->stop_read |
556 | |
1280 | |
557 | =item $handle->start_read |
1281 | =item $handle->start_read |
558 | |
1282 | |
559 | In rare cases you actually do not want to read anything form the |
1283 | In rare cases you actually do not want to read anything from the |
560 | socket. In this case you can call C<stop_read>. Neither C<on_read> no |
1284 | socket. In this case you can call C<stop_read>. Neither C<on_read> nor |
561 | any queued callbacks will be executed then. To start readign again, call |
1285 | any queued callbacks will be executed then. To start reading again, call |
562 | C<start_read>. |
1286 | C<start_read>. |
|
|
1287 | |
|
|
1288 | Note that AnyEvent::Handle will automatically C<start_read> for you when |
|
|
1289 | you change the C<on_read> callback or push/unshift a read callback, and it |
|
|
1290 | will automatically C<stop_read> for you when neither C<on_read> is set nor |
|
|
1291 | there are any read requests in the queue. |
|
|
1292 | |
|
|
1293 | These methods will have no effect when in TLS mode (as TLS doesn't support |
|
|
1294 | half-duplex connections). |
563 | |
1295 | |
564 | =cut |
1296 | =cut |
565 | |
1297 | |
566 | sub stop_read { |
1298 | sub stop_read { |
567 | my ($self) = @_; |
1299 | my ($self) = @_; |
568 | |
1300 | |
569 | delete $self->{rw}; |
1301 | delete $self->{_rw} unless $self->{tls}; |
570 | } |
1302 | } |
571 | |
1303 | |
572 | sub start_read { |
1304 | sub start_read { |
573 | my ($self) = @_; |
1305 | my ($self) = @_; |
574 | |
1306 | |
575 | unless ($self->{rw} || $self->{eof}) { |
1307 | unless ($self->{_rw} || $self->{_eof}) { |
576 | Scalar::Util::weaken $self; |
1308 | Scalar::Util::weaken $self; |
577 | |
1309 | |
578 | $self->{rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
1310 | $self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
|
|
1311 | my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf}); |
579 | my $len = sysread $self->{fh}, $self->{rbuf}, $self->{read_size} || 8192, length $self->{rbuf}; |
1312 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
580 | |
1313 | |
581 | if ($len > 0) { |
1314 | if ($len > 0) { |
|
|
1315 | $self->{_activity} = AnyEvent->now; |
|
|
1316 | |
582 | if (exists $self->{rbuf_max}) { |
1317 | if ($self->{tls}) { |
583 | if ($self->{rbuf_max} < length $self->{rbuf}) { |
1318 | Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf); |
584 | $! = &Errno::ENOSPC; return $self->error; |
1319 | |
585 | } |
1320 | &_dotls ($self); |
|
|
1321 | } else { |
|
|
1322 | $self->_drain_rbuf unless $self->{_in_drain}; |
586 | } |
1323 | } |
587 | |
1324 | |
588 | } elsif (defined $len) { |
1325 | } elsif (defined $len) { |
589 | $self->{eof} = 1; |
|
|
590 | delete $self->{rw}; |
1326 | delete $self->{_rw}; |
|
|
1327 | $self->{_eof} = 1; |
|
|
1328 | $self->_drain_rbuf unless $self->{_in_drain}; |
591 | |
1329 | |
592 | } elsif ($! != EAGAIN && $! != EINTR) { |
1330 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
593 | return $self->error; |
1331 | return $self->_error ($!, 1); |
594 | } |
1332 | } |
595 | |
|
|
596 | $self->_drain_rbuf; |
|
|
597 | }); |
1333 | }); |
598 | } |
1334 | } |
599 | } |
1335 | } |
600 | |
1336 | |
|
|
1337 | # poll the write BIO and send the data if applicable |
|
|
1338 | sub _dotls { |
|
|
1339 | my ($self) = @_; |
|
|
1340 | |
|
|
1341 | my $tmp; |
|
|
1342 | |
|
|
1343 | if (length $self->{_tls_wbuf}) { |
|
|
1344 | while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) { |
|
|
1345 | substr $self->{_tls_wbuf}, 0, $tmp, ""; |
|
|
1346 | } |
|
|
1347 | } |
|
|
1348 | |
|
|
1349 | while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) { |
|
|
1350 | unless (length $tmp) { |
|
|
1351 | # let's treat SSL-eof as we treat normal EOF |
|
|
1352 | delete $self->{_rw}; |
|
|
1353 | $self->{_eof} = 1; |
|
|
1354 | &_freetls; |
|
|
1355 | } |
|
|
1356 | |
|
|
1357 | $self->{_tls_rbuf} .= $tmp; |
|
|
1358 | $self->_drain_rbuf unless $self->{_in_drain}; |
|
|
1359 | $self->{tls} or return; # tls session might have gone away in callback |
|
|
1360 | } |
|
|
1361 | |
|
|
1362 | $tmp = Net::SSLeay::get_error ($self->{tls}, -1); |
|
|
1363 | |
|
|
1364 | if ($tmp != Net::SSLeay::ERROR_WANT_READ ()) { |
|
|
1365 | if ($tmp == Net::SSLeay::ERROR_SYSCALL ()) { |
|
|
1366 | return $self->_error ($!, 1); |
|
|
1367 | } elsif ($tmp == Net::SSLeay::ERROR_SSL ()) { |
|
|
1368 | return $self->_error (&Errno::EIO, 1); |
|
|
1369 | } |
|
|
1370 | |
|
|
1371 | # all other errors are fine for our purposes |
|
|
1372 | } |
|
|
1373 | |
|
|
1374 | while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
|
|
1375 | $self->{wbuf} .= $tmp; |
|
|
1376 | $self->_drain_wbuf; |
|
|
1377 | } |
|
|
1378 | } |
|
|
1379 | |
|
|
1380 | =item $handle->starttls ($tls[, $tls_ctx]) |
|
|
1381 | |
|
|
1382 | Instead of starting TLS negotiation immediately when the AnyEvent::Handle |
|
|
1383 | object is created, you can also do that at a later time by calling |
|
|
1384 | C<starttls>. |
|
|
1385 | |
|
|
1386 | The first argument is the same as the C<tls> constructor argument (either |
|
|
1387 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
|
|
1388 | |
|
|
1389 | The second argument is the optional C<Net::SSLeay::CTX> object that is |
|
|
1390 | used when AnyEvent::Handle has to create its own TLS connection object. |
|
|
1391 | |
|
|
1392 | The TLS connection object will end up in C<< $handle->{tls} >> after this |
|
|
1393 | call and can be used or changed to your liking. Note that the handshake |
|
|
1394 | might have already started when this function returns. |
|
|
1395 | |
|
|
1396 | If it an error to start a TLS handshake more than once per |
|
|
1397 | AnyEvent::Handle object (this is due to bugs in OpenSSL). |
|
|
1398 | |
|
|
1399 | =cut |
|
|
1400 | |
|
|
1401 | sub starttls { |
|
|
1402 | my ($self, $ssl, $ctx) = @_; |
|
|
1403 | |
|
|
1404 | require Net::SSLeay; |
|
|
1405 | |
|
|
1406 | Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object" |
|
|
1407 | if $self->{tls}; |
|
|
1408 | |
|
|
1409 | if ($ssl eq "accept") { |
|
|
1410 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
|
|
1411 | Net::SSLeay::set_accept_state ($ssl); |
|
|
1412 | } elsif ($ssl eq "connect") { |
|
|
1413 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
|
|
1414 | Net::SSLeay::set_connect_state ($ssl); |
|
|
1415 | } |
|
|
1416 | |
|
|
1417 | $self->{tls} = $ssl; |
|
|
1418 | |
|
|
1419 | # basically, this is deep magic (because SSL_read should have the same issues) |
|
|
1420 | # but the openssl maintainers basically said: "trust us, it just works". |
|
|
1421 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
|
|
1422 | # and mismaintained ssleay-module doesn't even offer them). |
|
|
1423 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
|
|
1424 | # |
|
|
1425 | # in short: this is a mess. |
|
|
1426 | # |
|
|
1427 | # note that we do not try to keep the length constant between writes as we are required to do. |
|
|
1428 | # we assume that most (but not all) of this insanity only applies to non-blocking cases, |
|
|
1429 | # and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to |
|
|
1430 | # have identity issues in that area. |
|
|
1431 | Net::SSLeay::CTX_set_mode ($self->{tls}, |
|
|
1432 | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
|
|
1433 | | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
|
|
1434 | |
|
|
1435 | $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
|
|
1436 | $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
|
|
1437 | |
|
|
1438 | Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio}); |
|
|
1439 | |
|
|
1440 | &_dotls; # need to trigger the initial handshake |
|
|
1441 | $self->start_read; # make sure we actually do read |
|
|
1442 | } |
|
|
1443 | |
|
|
1444 | =item $handle->stoptls |
|
|
1445 | |
|
|
1446 | Shuts down the SSL connection - this makes a proper EOF handshake by |
|
|
1447 | sending a close notify to the other side, but since OpenSSL doesn't |
|
|
1448 | support non-blocking shut downs, it is not possible to re-use the stream |
|
|
1449 | afterwards. |
|
|
1450 | |
|
|
1451 | =cut |
|
|
1452 | |
|
|
1453 | sub stoptls { |
|
|
1454 | my ($self) = @_; |
|
|
1455 | |
|
|
1456 | if ($self->{tls}) { |
|
|
1457 | Net::SSLeay::shutdown ($self->{tls}); |
|
|
1458 | |
|
|
1459 | &_dotls; |
|
|
1460 | |
|
|
1461 | # we don't give a shit. no, we do, but we can't. no... |
|
|
1462 | # we, we... have to use openssl :/ |
|
|
1463 | &_freetls; |
|
|
1464 | } |
|
|
1465 | } |
|
|
1466 | |
|
|
1467 | sub _freetls { |
|
|
1468 | my ($self) = @_; |
|
|
1469 | |
|
|
1470 | return unless $self->{tls}; |
|
|
1471 | |
|
|
1472 | Net::SSLeay::free (delete $self->{tls}); |
|
|
1473 | |
|
|
1474 | delete @$self{qw(_rbio _wbio _tls_wbuf)}; |
|
|
1475 | } |
|
|
1476 | |
|
|
1477 | sub DESTROY { |
|
|
1478 | my ($self) = @_; |
|
|
1479 | |
|
|
1480 | &_freetls; |
|
|
1481 | |
|
|
1482 | my $linger = exists $self->{linger} ? $self->{linger} : 3600; |
|
|
1483 | |
|
|
1484 | if ($linger && length $self->{wbuf}) { |
|
|
1485 | my $fh = delete $self->{fh}; |
|
|
1486 | my $wbuf = delete $self->{wbuf}; |
|
|
1487 | |
|
|
1488 | my @linger; |
|
|
1489 | |
|
|
1490 | push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub { |
|
|
1491 | my $len = syswrite $fh, $wbuf, length $wbuf; |
|
|
1492 | |
|
|
1493 | if ($len > 0) { |
|
|
1494 | substr $wbuf, 0, $len, ""; |
|
|
1495 | } else { |
|
|
1496 | @linger = (); # end |
|
|
1497 | } |
|
|
1498 | }); |
|
|
1499 | push @linger, AnyEvent->timer (after => $linger, cb => sub { |
|
|
1500 | @linger = (); |
|
|
1501 | }); |
|
|
1502 | } |
|
|
1503 | } |
|
|
1504 | |
|
|
1505 | =item $handle->destroy |
|
|
1506 | |
|
|
1507 | Shuts down the handle object as much as possible - this call ensures that |
|
|
1508 | no further callbacks will be invoked and resources will be freed as much |
|
|
1509 | as possible. You must not call any methods on the object afterwards. |
|
|
1510 | |
|
|
1511 | Normally, you can just "forget" any references to an AnyEvent::Handle |
|
|
1512 | object and it will simply shut down. This works in fatal error and EOF |
|
|
1513 | callbacks, as well as code outside. It does I<NOT> work in a read or write |
|
|
1514 | callback, so when you want to destroy the AnyEvent::Handle object from |
|
|
1515 | within such an callback. You I<MUST> call C<< ->destroy >> explicitly in |
|
|
1516 | that case. |
|
|
1517 | |
|
|
1518 | The handle might still linger in the background and write out remaining |
|
|
1519 | data, as specified by the C<linger> option, however. |
|
|
1520 | |
|
|
1521 | =cut |
|
|
1522 | |
|
|
1523 | sub destroy { |
|
|
1524 | my ($self) = @_; |
|
|
1525 | |
|
|
1526 | $self->DESTROY; |
|
|
1527 | %$self = (); |
|
|
1528 | } |
|
|
1529 | |
|
|
1530 | =item AnyEvent::Handle::TLS_CTX |
|
|
1531 | |
|
|
1532 | This function creates and returns the Net::SSLeay::CTX object used by |
|
|
1533 | default for TLS mode. |
|
|
1534 | |
|
|
1535 | The context is created like this: |
|
|
1536 | |
|
|
1537 | Net::SSLeay::load_error_strings; |
|
|
1538 | Net::SSLeay::SSLeay_add_ssl_algorithms; |
|
|
1539 | Net::SSLeay::randomize; |
|
|
1540 | |
|
|
1541 | my $CTX = Net::SSLeay::CTX_new; |
|
|
1542 | |
|
|
1543 | Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL |
|
|
1544 | |
|
|
1545 | =cut |
|
|
1546 | |
|
|
1547 | our $TLS_CTX; |
|
|
1548 | |
|
|
1549 | sub TLS_CTX() { |
|
|
1550 | $TLS_CTX || do { |
|
|
1551 | require Net::SSLeay; |
|
|
1552 | |
|
|
1553 | Net::SSLeay::load_error_strings (); |
|
|
1554 | Net::SSLeay::SSLeay_add_ssl_algorithms (); |
|
|
1555 | Net::SSLeay::randomize (); |
|
|
1556 | |
|
|
1557 | $TLS_CTX = Net::SSLeay::CTX_new (); |
|
|
1558 | |
|
|
1559 | Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ()); |
|
|
1560 | |
|
|
1561 | $TLS_CTX |
|
|
1562 | } |
|
|
1563 | } |
|
|
1564 | |
601 | =back |
1565 | =back |
602 | |
1566 | |
|
|
1567 | |
|
|
1568 | =head1 NONFREQUENTLY ASKED QUESTIONS |
|
|
1569 | |
|
|
1570 | =over 4 |
|
|
1571 | |
|
|
1572 | =item I C<undef> the AnyEvent::Handle reference inside my callback and |
|
|
1573 | still get further invocations! |
|
|
1574 | |
|
|
1575 | That's because AnyEvent::Handle keeps a reference to itself when handling |
|
|
1576 | read or write callbacks. |
|
|
1577 | |
|
|
1578 | It is only safe to "forget" the reference inside EOF or error callbacks, |
|
|
1579 | from within all other callbacks, you need to explicitly call the C<< |
|
|
1580 | ->destroy >> method. |
|
|
1581 | |
|
|
1582 | =item I get different callback invocations in TLS mode/Why can't I pause |
|
|
1583 | reading? |
|
|
1584 | |
|
|
1585 | Unlike, say, TCP, TLS connections do not consist of two independent |
|
|
1586 | communication channels, one for each direction. Or put differently. The |
|
|
1587 | read and write directions are not independent of each other: you cannot |
|
|
1588 | write data unless you are also prepared to read, and vice versa. |
|
|
1589 | |
|
|
1590 | This can mean than, in TLS mode, you might get C<on_error> or C<on_eof> |
|
|
1591 | callback invocations when you are not expecting any read data - the reason |
|
|
1592 | is that AnyEvent::Handle always reads in TLS mode. |
|
|
1593 | |
|
|
1594 | During the connection, you have to make sure that you always have a |
|
|
1595 | non-empty read-queue, or an C<on_read> watcher. At the end of the |
|
|
1596 | connection (or when you no longer want to use it) you can call the |
|
|
1597 | C<destroy> method. |
|
|
1598 | |
|
|
1599 | =item How do I read data until the other side closes the connection? |
|
|
1600 | |
|
|
1601 | If you just want to read your data into a perl scalar, the easiest way |
|
|
1602 | to achieve this is by setting an C<on_read> callback that does nothing, |
|
|
1603 | clearing the C<on_eof> callback and in the C<on_error> callback, the data |
|
|
1604 | will be in C<$_[0]{rbuf}>: |
|
|
1605 | |
|
|
1606 | $handle->on_read (sub { }); |
|
|
1607 | $handle->on_eof (undef); |
|
|
1608 | $handle->on_error (sub { |
|
|
1609 | my $data = delete $_[0]{rbuf}; |
|
|
1610 | undef $handle; |
|
|
1611 | }); |
|
|
1612 | |
|
|
1613 | The reason to use C<on_error> is that TCP connections, due to latencies |
|
|
1614 | and packets loss, might get closed quite violently with an error, when in |
|
|
1615 | fact, all data has been received. |
|
|
1616 | |
|
|
1617 | It is usually better to use acknowledgements when transferring data, |
|
|
1618 | to make sure the other side hasn't just died and you got the data |
|
|
1619 | intact. This is also one reason why so many internet protocols have an |
|
|
1620 | explicit QUIT command. |
|
|
1621 | |
|
|
1622 | =item I don't want to destroy the handle too early - how do I wait until |
|
|
1623 | all data has been written? |
|
|
1624 | |
|
|
1625 | After writing your last bits of data, set the C<on_drain> callback |
|
|
1626 | and destroy the handle in there - with the default setting of |
|
|
1627 | C<low_water_mark> this will be called precisely when all data has been |
|
|
1628 | written to the socket: |
|
|
1629 | |
|
|
1630 | $handle->push_write (...); |
|
|
1631 | $handle->on_drain (sub { |
|
|
1632 | warn "all data submitted to the kernel\n"; |
|
|
1633 | undef $handle; |
|
|
1634 | }); |
|
|
1635 | |
|
|
1636 | =back |
|
|
1637 | |
|
|
1638 | |
|
|
1639 | =head1 SUBCLASSING AnyEvent::Handle |
|
|
1640 | |
|
|
1641 | In many cases, you might want to subclass AnyEvent::Handle. |
|
|
1642 | |
|
|
1643 | To make this easier, a given version of AnyEvent::Handle uses these |
|
|
1644 | conventions: |
|
|
1645 | |
|
|
1646 | =over 4 |
|
|
1647 | |
|
|
1648 | =item * all constructor arguments become object members. |
|
|
1649 | |
|
|
1650 | At least initially, when you pass a C<tls>-argument to the constructor it |
|
|
1651 | will end up in C<< $handle->{tls} >>. Those members might be changed or |
|
|
1652 | mutated later on (for example C<tls> will hold the TLS connection object). |
|
|
1653 | |
|
|
1654 | =item * other object member names are prefixed with an C<_>. |
|
|
1655 | |
|
|
1656 | All object members not explicitly documented (internal use) are prefixed |
|
|
1657 | with an underscore character, so the remaining non-C<_>-namespace is free |
|
|
1658 | for use for subclasses. |
|
|
1659 | |
|
|
1660 | =item * all members not documented here and not prefixed with an underscore |
|
|
1661 | are free to use in subclasses. |
|
|
1662 | |
|
|
1663 | Of course, new versions of AnyEvent::Handle may introduce more "public" |
|
|
1664 | member variables, but thats just life, at least it is documented. |
|
|
1665 | |
|
|
1666 | =back |
|
|
1667 | |
603 | =head1 AUTHOR |
1668 | =head1 AUTHOR |
604 | |
1669 | |
605 | Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>. |
1670 | Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>. |
606 | |
1671 | |
607 | =cut |
1672 | =cut |