1 | package AnyEvent::Handle; |
1 | package AnyEvent::Handle; |
2 | |
2 | |
3 | no warnings; |
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4 | use strict; |
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5 | |
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6 | use AnyEvent (); |
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7 | use AnyEvent::Util qw(WSAWOULDBLOCK); |
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8 | use Scalar::Util (); |
3 | use Scalar::Util (); |
9 | use Carp (); |
4 | use Carp (); |
10 | use Fcntl (); |
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11 | use Errno qw/EAGAIN EINTR/; |
5 | use Errno qw(EAGAIN EINTR); |
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6 | |
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7 | use AnyEvent (); BEGIN { AnyEvent::common_sense } |
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8 | use AnyEvent::Util qw(WSAEWOULDBLOCK); |
12 | |
9 | |
13 | =head1 NAME |
10 | =head1 NAME |
14 | |
11 | |
15 | AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent |
12 | AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent |
16 | |
13 | |
17 | =cut |
14 | =cut |
18 | |
15 | |
19 | our $VERSION = '0.04'; |
16 | our $VERSION = 4.86; |
20 | |
17 | |
21 | =head1 SYNOPSIS |
18 | =head1 SYNOPSIS |
22 | |
19 | |
23 | use AnyEvent; |
20 | use AnyEvent; |
24 | use AnyEvent::Handle; |
21 | use AnyEvent::Handle; |
25 | |
22 | |
26 | my $cv = AnyEvent->condvar; |
23 | my $cv = AnyEvent->condvar; |
27 | |
24 | |
28 | my $handle = |
25 | my $hdl; $hdl = new AnyEvent::Handle |
29 | AnyEvent::Handle->new ( |
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30 | fh => \*STDIN, |
26 | fh => \*STDIN, |
31 | on_eof => sub { |
27 | on_error => sub { |
32 | $cv->broadcast; |
28 | my ($hdl, $fatal, $msg) = @_; |
33 | }, |
29 | warn "got error $msg\n"; |
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30 | $hdl->destroy; |
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31 | $cv->send; |
34 | ); |
32 | ); |
35 | |
33 | |
36 | # send some request line |
34 | # send some request line |
37 | $handle->push_write ("getinfo\015\012"); |
35 | $hdl->push_write ("getinfo\015\012"); |
38 | |
36 | |
39 | # read the response line |
37 | # read the response line |
40 | $handle->push_read (line => sub { |
38 | $hdl->push_read (line => sub { |
41 | my ($handle, $line) = @_; |
39 | my ($hdl, $line) = @_; |
42 | warn "read line <$line>\n"; |
40 | warn "got line <$line>\n"; |
43 | $cv->send; |
41 | $cv->send; |
44 | }); |
42 | }); |
45 | |
43 | |
46 | $cv->recv; |
44 | $cv->recv; |
47 | |
45 | |
… | |
… | |
49 | |
47 | |
50 | This module is a helper module to make it easier to do event-based I/O on |
48 | This module is a helper module to make it easier to do event-based I/O on |
51 | filehandles. For utility functions for doing non-blocking connects and accepts |
49 | filehandles. For utility functions for doing non-blocking connects and accepts |
52 | on sockets see L<AnyEvent::Util>. |
50 | on sockets see L<AnyEvent::Util>. |
53 | |
51 | |
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52 | The L<AnyEvent::Intro> tutorial contains some well-documented |
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53 | AnyEvent::Handle examples. |
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54 | |
54 | In the following, when the documentation refers to of "bytes" then this |
55 | In the following, when the documentation refers to of "bytes" then this |
55 | means characters. As sysread and syswrite are used for all I/O, their |
56 | means characters. As sysread and syswrite are used for all I/O, their |
56 | treatment of characters applies to this module as well. |
57 | treatment of characters applies to this module as well. |
57 | |
58 | |
58 | All callbacks will be invoked with the handle object as their first |
59 | All callbacks will be invoked with the handle object as their first |
… | |
… | |
60 | |
61 | |
61 | =head1 METHODS |
62 | =head1 METHODS |
62 | |
63 | |
63 | =over 4 |
64 | =over 4 |
64 | |
65 | |
65 | =item B<new (%args)> |
66 | =item $handle = B<new> AnyEvent::TLS fh => $filehandle, key => value... |
66 | |
67 | |
67 | The constructor supports these arguments (all as key => value pairs). |
68 | The constructor supports these arguments (all as C<< key => value >> pairs). |
68 | |
69 | |
69 | =over 4 |
70 | =over 4 |
70 | |
71 | |
71 | =item fh => $filehandle [MANDATORY] |
72 | =item fh => $filehandle [MANDATORY] |
72 | |
73 | |
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74 | #=item fh => $filehandle [C<fh> or C<connect> MANDATORY] |
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75 | |
73 | The filehandle this L<AnyEvent::Handle> object will operate on. |
76 | The filehandle this L<AnyEvent::Handle> object will operate on. |
74 | |
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75 | NOTE: The filehandle will be set to non-blocking (using |
77 | NOTE: The filehandle will be set to non-blocking mode (using |
76 | AnyEvent::Util::fh_nonblocking). |
78 | C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in |
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79 | that mode. |
77 | |
80 | |
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81 | #=item connect => [$host, $service] |
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82 | # |
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83 | # You have to specify either this parameter, or C<connect>, below. |
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84 | #Try to connect to the specified host and service (port), using |
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85 | #C<AnyEvent::Socket::tcp_connect>. |
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86 | # |
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87 | #When this |
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88 | |
78 | =item on_eof => $cb->($self) |
89 | =item on_eof => $cb->($handle) |
79 | |
90 | |
80 | Set the callback to be called on EOF. |
91 | Set the callback to be called when an end-of-file condition is detected, |
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92 | i.e. in the case of a socket, when the other side has closed the |
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93 | connection cleanly, and there are no outstanding read requests in the |
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94 | queue (if there are read requests, then an EOF counts as an unexpected |
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95 | connection close and will be flagged as an error). |
81 | |
96 | |
82 | While not mandatory, it is highly recommended to set an eof callback, |
97 | For sockets, this just means that the other side has stopped sending data, |
83 | otherwise you might end up with a closed socket while you are still |
98 | you can still try to write data, and, in fact, one can return from the EOF |
84 | waiting for data. |
99 | callback and continue writing data, as only the read part has been shut |
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100 | down. |
85 | |
101 | |
86 | =item on_error => $cb->($self) |
102 | If an EOF condition has been detected but no C<on_eof> callback has been |
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103 | set, then a fatal error will be raised with C<$!> set to <0>. |
87 | |
104 | |
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105 | =item on_error => $cb->($handle, $fatal, $message) |
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106 | |
88 | This is the fatal error callback, that is called when, well, a fatal error |
107 | This is the error callback, which is called when, well, some error |
89 | occurs, such as not being able to resolve the hostname, failure to connect |
108 | occured, such as not being able to resolve the hostname, failure to |
90 | or a read error. |
109 | connect or a read error. |
91 | |
110 | |
92 | The object will not be in a usable state when this callback has been |
111 | Some errors are fatal (which is indicated by C<$fatal> being true). On |
93 | called. |
112 | fatal errors the handle object will be destroyed (by a call to C<< -> |
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113 | destroy >>) after invoking the error callback (which means you are free to |
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114 | examine the handle object). Examples of fatal errors are an EOF condition |
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115 | with active (but unsatisifable) read watchers (C<EPIPE>) or I/O errors. |
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116 | |
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117 | AnyEvent::Handle tries to find an appropriate error code for you to check |
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118 | against, but in some cases (TLS errors), this does not work well. It is |
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119 | recommended to always output the C<$message> argument in human-readable |
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120 | error messages (it's usually the same as C<"$!">). |
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121 | |
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122 | Non-fatal errors can be retried by simply returning, but it is recommended |
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123 | to simply ignore this parameter and instead abondon the handle object |
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124 | when this callback is invoked. Examples of non-fatal errors are timeouts |
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125 | C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>). |
94 | |
126 | |
95 | On callback entrance, the value of C<$!> contains the operating system |
127 | On callback entrance, the value of C<$!> contains the operating system |
96 | error (or C<ENOSPC>, C<EPIPE> or C<EBADMSG>). |
128 | error code (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT>, C<EBADMSG> or |
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129 | C<EPROTO>). |
97 | |
130 | |
98 | While not mandatory, it is I<highly> recommended to set this callback, as |
131 | While not mandatory, it is I<highly> recommended to set this callback, as |
99 | you will not be notified of errors otherwise. The default simply calls |
132 | you will not be notified of errors otherwise. The default simply calls |
100 | die. |
133 | C<croak>. |
101 | |
134 | |
102 | =item on_read => $cb->($self) |
135 | =item on_read => $cb->($handle) |
103 | |
136 | |
104 | This sets the default read callback, which is called when data arrives |
137 | This sets the default read callback, which is called when data arrives |
105 | and no read request is in the queue. |
138 | and no read request is in the queue (unlike read queue callbacks, this |
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139 | callback will only be called when at least one octet of data is in the |
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140 | read buffer). |
106 | |
141 | |
107 | To access (and remove data from) the read buffer, use the C<< ->rbuf >> |
142 | To access (and remove data from) the read buffer, use the C<< ->rbuf >> |
108 | method or access the C<$self->{rbuf}> member directly. |
143 | method or access the C<< $handle->{rbuf} >> member directly. Note that you |
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144 | must not enlarge or modify the read buffer, you can only remove data at |
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145 | the beginning from it. |
109 | |
146 | |
110 | When an EOF condition is detected then AnyEvent::Handle will first try to |
147 | When an EOF condition is detected then AnyEvent::Handle will first try to |
111 | feed all the remaining data to the queued callbacks and C<on_read> before |
148 | feed all the remaining data to the queued callbacks and C<on_read> before |
112 | calling the C<on_eof> callback. If no progress can be made, then a fatal |
149 | calling the C<on_eof> callback. If no progress can be made, then a fatal |
113 | error will be raised (with C<$!> set to C<EPIPE>). |
150 | error will be raised (with C<$!> set to C<EPIPE>). |
114 | |
151 | |
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152 | Note that, unlike requests in the read queue, an C<on_read> callback |
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153 | doesn't mean you I<require> some data: if there is an EOF and there |
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154 | are outstanding read requests then an error will be flagged. With an |
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155 | C<on_read> callback, the C<on_eof> callback will be invoked. |
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156 | |
115 | =item on_drain => $cb->() |
157 | =item on_drain => $cb->($handle) |
116 | |
158 | |
117 | This sets the callback that is called when the write buffer becomes empty |
159 | This sets the callback that is called when the write buffer becomes empty |
118 | (or when the callback is set and the buffer is empty already). |
160 | (or when the callback is set and the buffer is empty already). |
119 | |
161 | |
120 | To append to the write buffer, use the C<< ->push_write >> method. |
162 | To append to the write buffer, use the C<< ->push_write >> method. |
121 | |
163 | |
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164 | This callback is useful when you don't want to put all of your write data |
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165 | into the queue at once, for example, when you want to write the contents |
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166 | of some file to the socket you might not want to read the whole file into |
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167 | memory and push it into the queue, but instead only read more data from |
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168 | the file when the write queue becomes empty. |
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169 | |
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170 | =item timeout => $fractional_seconds |
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171 | |
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172 | If non-zero, then this enables an "inactivity" timeout: whenever this many |
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173 | seconds pass without a successful read or write on the underlying file |
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174 | handle, the C<on_timeout> callback will be invoked (and if that one is |
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175 | missing, a non-fatal C<ETIMEDOUT> error will be raised). |
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176 | |
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177 | Note that timeout processing is also active when you currently do not have |
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178 | any outstanding read or write requests: If you plan to keep the connection |
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179 | idle then you should disable the timout temporarily or ignore the timeout |
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180 | in the C<on_timeout> callback, in which case AnyEvent::Handle will simply |
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181 | restart the timeout. |
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182 | |
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183 | Zero (the default) disables this timeout. |
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184 | |
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185 | =item on_timeout => $cb->($handle) |
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186 | |
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187 | Called whenever the inactivity timeout passes. If you return from this |
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188 | callback, then the timeout will be reset as if some activity had happened, |
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189 | so this condition is not fatal in any way. |
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190 | |
122 | =item rbuf_max => <bytes> |
191 | =item rbuf_max => <bytes> |
123 | |
192 | |
124 | If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
193 | If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
125 | when the read buffer ever (strictly) exceeds this size. This is useful to |
194 | when the read buffer ever (strictly) exceeds this size. This is useful to |
126 | avoid denial-of-service attacks. |
195 | avoid some forms of denial-of-service attacks. |
127 | |
196 | |
128 | For example, a server accepting connections from untrusted sources should |
197 | For example, a server accepting connections from untrusted sources should |
129 | be configured to accept only so-and-so much data that it cannot act on |
198 | be configured to accept only so-and-so much data that it cannot act on |
130 | (for example, when expecting a line, an attacker could send an unlimited |
199 | (for example, when expecting a line, an attacker could send an unlimited |
131 | amount of data without a callback ever being called as long as the line |
200 | amount of data without a callback ever being called as long as the line |
132 | isn't finished). |
201 | isn't finished). |
133 | |
202 | |
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203 | =item autocork => <boolean> |
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204 | |
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205 | When disabled (the default), then C<push_write> will try to immediately |
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206 | write the data to the handle, if possible. This avoids having to register |
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207 | a write watcher and wait for the next event loop iteration, but can |
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208 | be inefficient if you write multiple small chunks (on the wire, this |
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209 | disadvantage is usually avoided by your kernel's nagle algorithm, see |
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210 | C<no_delay>, but this option can save costly syscalls). |
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211 | |
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212 | When enabled, then writes will always be queued till the next event loop |
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213 | iteration. This is efficient when you do many small writes per iteration, |
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214 | but less efficient when you do a single write only per iteration (or when |
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215 | the write buffer often is full). It also increases write latency. |
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216 | |
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217 | =item no_delay => <boolean> |
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218 | |
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219 | When doing small writes on sockets, your operating system kernel might |
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220 | wait a bit for more data before actually sending it out. This is called |
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221 | the Nagle algorithm, and usually it is beneficial. |
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222 | |
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223 | In some situations you want as low a delay as possible, which can be |
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224 | accomplishd by setting this option to a true value. |
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225 | |
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226 | The default is your opertaing system's default behaviour (most likely |
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227 | enabled), this option explicitly enables or disables it, if possible. |
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228 | |
134 | =item read_size => <bytes> |
229 | =item read_size => <bytes> |
135 | |
230 | |
136 | The default read block size (the amount of bytes this module will try to read |
231 | The default read block size (the amount of bytes this module will |
137 | on each [loop iteration). Default: C<4096>. |
232 | try to read during each loop iteration, which affects memory |
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233 | requirements). Default: C<8192>. |
138 | |
234 | |
139 | =item low_water_mark => <bytes> |
235 | =item low_water_mark => <bytes> |
140 | |
236 | |
141 | Sets the amount of bytes (default: C<0>) that make up an "empty" write |
237 | Sets the amount of bytes (default: C<0>) that make up an "empty" write |
142 | buffer: If the write reaches this size or gets even samller it is |
238 | buffer: If the write reaches this size or gets even samller it is |
143 | considered empty. |
239 | considered empty. |
144 | |
240 | |
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241 | Sometimes it can be beneficial (for performance reasons) to add data to |
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242 | the write buffer before it is fully drained, but this is a rare case, as |
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243 | the operating system kernel usually buffers data as well, so the default |
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244 | is good in almost all cases. |
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245 | |
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246 | =item linger => <seconds> |
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247 | |
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248 | If non-zero (default: C<3600>), then the destructor of the |
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249 | AnyEvent::Handle object will check whether there is still outstanding |
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250 | write data and will install a watcher that will write this data to the |
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251 | socket. No errors will be reported (this mostly matches how the operating |
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252 | system treats outstanding data at socket close time). |
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253 | |
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254 | This will not work for partial TLS data that could not be encoded |
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255 | yet. This data will be lost. Calling the C<stoptls> method in time might |
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256 | help. |
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257 | |
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258 | =item peername => $string |
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259 | |
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260 | A string used to identify the remote site - usually the DNS hostname |
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261 | (I<not> IDN!) used to create the connection, rarely the IP address. |
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262 | |
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263 | Apart from being useful in error messages, this string is also used in TLS |
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264 | peername verification (see C<verify_peername> in L<AnyEvent::TLS>). This |
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265 | verification will be skipped when C<peername> is not specified or |
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266 | C<undef>. |
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267 | |
145 | =item tls => "accept" | "connect" | Net::SSLeay::SSL object |
268 | =item tls => "accept" | "connect" | Net::SSLeay::SSL object |
146 | |
269 | |
147 | When this parameter is given, it enables TLS (SSL) mode, that means it |
270 | When this parameter is given, it enables TLS (SSL) mode, that means |
148 | will start making tls handshake and will transparently encrypt/decrypt |
271 | AnyEvent will start a TLS handshake as soon as the conenction has been |
149 | data. |
272 | established and will transparently encrypt/decrypt data afterwards. |
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273 | |
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274 | All TLS protocol errors will be signalled as C<EPROTO>, with an |
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275 | appropriate error message. |
150 | |
276 | |
151 | TLS mode requires Net::SSLeay to be installed (it will be loaded |
277 | TLS mode requires Net::SSLeay to be installed (it will be loaded |
152 | automatically when you try to create a TLS handle). |
278 | automatically when you try to create a TLS handle): this module doesn't |
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279 | have a dependency on that module, so if your module requires it, you have |
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280 | to add the dependency yourself. |
153 | |
281 | |
154 | For the TLS server side, use C<accept>, and for the TLS client side of a |
282 | Unlike TCP, TLS has a server and client side: for the TLS server side, use |
155 | connection, use C<connect> mode. |
283 | C<accept>, and for the TLS client side of a connection, use C<connect> |
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284 | mode. |
156 | |
285 | |
157 | You can also provide your own TLS connection object, but you have |
286 | You can also provide your own TLS connection object, but you have |
158 | to make sure that you call either C<Net::SSLeay::set_connect_state> |
287 | to make sure that you call either C<Net::SSLeay::set_connect_state> |
159 | or C<Net::SSLeay::set_accept_state> on it before you pass it to |
288 | or C<Net::SSLeay::set_accept_state> on it before you pass it to |
160 | AnyEvent::Handle. |
289 | AnyEvent::Handle. Also, this module will take ownership of this connection |
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290 | object. |
161 | |
291 | |
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292 | At some future point, AnyEvent::Handle might switch to another TLS |
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293 | implementation, then the option to use your own session object will go |
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294 | away. |
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295 | |
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296 | B<IMPORTANT:> since Net::SSLeay "objects" are really only integers, |
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297 | passing in the wrong integer will lead to certain crash. This most often |
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298 | happens when one uses a stylish C<< tls => 1 >> and is surprised about the |
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299 | segmentation fault. |
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300 | |
162 | See the C<starttls> method if you need to start TLs negotiation later. |
301 | See the C<< ->starttls >> method for when need to start TLS negotiation later. |
163 | |
302 | |
164 | =item tls_ctx => $ssl_ctx |
303 | =item tls_ctx => $anyevent_tls |
165 | |
304 | |
166 | Use the given Net::SSLeay::CTX object to create the new TLS connection |
305 | Use the given C<AnyEvent::TLS> object to create the new TLS connection |
167 | (unless a connection object was specified directly). If this parameter is |
306 | (unless a connection object was specified directly). If this parameter is |
168 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
307 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
169 | |
308 | |
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309 | Instead of an object, you can also specify a hash reference with C<< key |
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310 | => value >> pairs. Those will be passed to L<AnyEvent::TLS> to create a |
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311 | new TLS context object. |
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312 | |
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313 | =item on_starttls => $cb->($handle, $success[, $error_message]) |
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314 | |
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315 | This callback will be invoked when the TLS/SSL handshake has finished. If |
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316 | C<$success> is true, then the TLS handshake succeeded, otherwise it failed |
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317 | (C<on_stoptls> will not be called in this case). |
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318 | |
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319 | The session in C<< $handle->{tls} >> can still be examined in this |
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320 | callback, even when the handshake was not successful. |
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321 | |
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322 | TLS handshake failures will not cause C<on_error> to be invoked when this |
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323 | callback is in effect, instead, the error message will be passed to C<on_starttls>. |
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324 | |
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325 | Without this callback, handshake failures lead to C<on_error> being |
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326 | called, as normal. |
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327 | |
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328 | Note that you cannot call C<starttls> right again in this callback. If you |
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329 | need to do that, start an zero-second timer instead whose callback can |
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330 | then call C<< ->starttls >> again. |
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331 | |
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332 | =item on_stoptls => $cb->($handle) |
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333 | |
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334 | When a SSLv3/TLS shutdown/close notify/EOF is detected and this callback is |
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335 | set, then it will be invoked after freeing the TLS session. If it is not, |
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336 | then a TLS shutdown condition will be treated like a normal EOF condition |
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337 | on the handle. |
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338 | |
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339 | The session in C<< $handle->{tls} >> can still be examined in this |
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340 | callback. |
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341 | |
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342 | This callback will only be called on TLS shutdowns, not when the |
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343 | underlying handle signals EOF. |
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344 | |
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345 | =item json => JSON or JSON::XS object |
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346 | |
|
|
347 | This is the json coder object used by the C<json> read and write types. |
|
|
348 | |
|
|
349 | If you don't supply it, then AnyEvent::Handle will create and use a |
|
|
350 | suitable one (on demand), which will write and expect UTF-8 encoded JSON |
|
|
351 | texts. |
|
|
352 | |
|
|
353 | Note that you are responsible to depend on the JSON module if you want to |
|
|
354 | use this functionality, as AnyEvent does not have a dependency itself. |
|
|
355 | |
170 | =back |
356 | =back |
171 | |
357 | |
172 | =cut |
358 | =cut |
173 | |
359 | |
174 | sub new { |
360 | sub new { |
175 | my $class = shift; |
361 | my $class = shift; |
176 | |
|
|
177 | my $self = bless { @_ }, $class; |
362 | my $self = bless { @_ }, $class; |
178 | |
363 | |
179 | $self->{fh} or Carp::croak "mandatory argument fh is missing"; |
364 | $self->{fh} or Carp::croak "mandatory argument fh is missing"; |
180 | |
365 | |
181 | AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
366 | AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
182 | |
367 | |
183 | if ($self->{tls}) { |
368 | $self->{_activity} = AnyEvent->now; |
184 | require Net::SSLeay; |
369 | $self->_timeout; |
|
|
370 | |
|
|
371 | $self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay}; |
|
|
372 | |
185 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}); |
373 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}) |
186 | } |
374 | if $self->{tls}; |
187 | |
375 | |
188 | $self->on_eof (delete $self->{on_eof} ) if $self->{on_eof}; |
|
|
189 | $self->on_error (delete $self->{on_error}) if $self->{on_error}; |
|
|
190 | $self->on_drain (delete $self->{on_drain}) if $self->{on_drain}; |
376 | $self->on_drain (delete $self->{on_drain}) if $self->{on_drain}; |
191 | $self->on_read (delete $self->{on_read} ) if $self->{on_read}; |
|
|
192 | |
377 | |
193 | $self->start_read; |
378 | $self->start_read |
|
|
379 | if $self->{on_read}; |
194 | |
380 | |
195 | $self |
381 | $self->{fh} && $self |
196 | } |
382 | } |
197 | |
383 | |
198 | sub _shutdown { |
384 | #sub _shutdown { |
199 | my ($self) = @_; |
385 | # my ($self) = @_; |
|
|
386 | # |
|
|
387 | # delete @$self{qw(_tw _rw _ww fh wbuf on_read _queue)}; |
|
|
388 | # $self->{_eof} = 1; # tell starttls et. al to stop trying |
|
|
389 | # |
|
|
390 | # &_freetls; |
|
|
391 | #} |
200 | |
392 | |
201 | delete $self->{rw}; |
|
|
202 | delete $self->{ww}; |
|
|
203 | delete $self->{fh}; |
|
|
204 | } |
|
|
205 | |
|
|
206 | sub error { |
393 | sub _error { |
207 | my ($self) = @_; |
394 | my ($self, $errno, $fatal, $message) = @_; |
208 | |
395 | |
209 | { |
396 | $! = $errno; |
210 | local $!; |
397 | $message ||= "$!"; |
211 | $self->_shutdown; |
|
|
212 | } |
|
|
213 | |
398 | |
214 | if ($self->{on_error}) { |
399 | if ($self->{on_error}) { |
215 | $self->{on_error}($self); |
400 | $self->{on_error}($self, $fatal, $message); |
216 | } else { |
401 | $self->destroy if $fatal; |
|
|
402 | } elsif ($self->{fh}) { |
|
|
403 | $self->destroy; |
217 | Carp::croak "AnyEvent::Handle uncaught fatal error: $!"; |
404 | Carp::croak "AnyEvent::Handle uncaught error: $message"; |
218 | } |
405 | } |
219 | } |
406 | } |
220 | |
407 | |
221 | =item $fh = $handle->fh |
408 | =item $fh = $handle->fh |
222 | |
409 | |
223 | This method returns the file handle of the L<AnyEvent::Handle> object. |
410 | This method returns the file handle used to create the L<AnyEvent::Handle> object. |
224 | |
411 | |
225 | =cut |
412 | =cut |
226 | |
413 | |
227 | sub fh { $_[0]->{fh} } |
414 | sub fh { $_[0]{fh} } |
228 | |
415 | |
229 | =item $handle->on_error ($cb) |
416 | =item $handle->on_error ($cb) |
230 | |
417 | |
231 | Replace the current C<on_error> callback (see the C<on_error> constructor argument). |
418 | Replace the current C<on_error> callback (see the C<on_error> constructor argument). |
232 | |
419 | |
… | |
… | |
244 | |
431 | |
245 | sub on_eof { |
432 | sub on_eof { |
246 | $_[0]{on_eof} = $_[1]; |
433 | $_[0]{on_eof} = $_[1]; |
247 | } |
434 | } |
248 | |
435 | |
|
|
436 | =item $handle->on_timeout ($cb) |
|
|
437 | |
|
|
438 | Replace the current C<on_timeout> callback, or disables the callback (but |
|
|
439 | not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor |
|
|
440 | argument and method. |
|
|
441 | |
|
|
442 | =cut |
|
|
443 | |
|
|
444 | sub on_timeout { |
|
|
445 | $_[0]{on_timeout} = $_[1]; |
|
|
446 | } |
|
|
447 | |
|
|
448 | =item $handle->autocork ($boolean) |
|
|
449 | |
|
|
450 | Enables or disables the current autocork behaviour (see C<autocork> |
|
|
451 | constructor argument). Changes will only take effect on the next write. |
|
|
452 | |
|
|
453 | =cut |
|
|
454 | |
|
|
455 | sub autocork { |
|
|
456 | $_[0]{autocork} = $_[1]; |
|
|
457 | } |
|
|
458 | |
|
|
459 | =item $handle->no_delay ($boolean) |
|
|
460 | |
|
|
461 | Enables or disables the C<no_delay> setting (see constructor argument of |
|
|
462 | the same name for details). |
|
|
463 | |
|
|
464 | =cut |
|
|
465 | |
|
|
466 | sub no_delay { |
|
|
467 | $_[0]{no_delay} = $_[1]; |
|
|
468 | |
|
|
469 | eval { |
|
|
470 | local $SIG{__DIE__}; |
|
|
471 | setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1]; |
|
|
472 | }; |
|
|
473 | } |
|
|
474 | |
|
|
475 | =item $handle->on_starttls ($cb) |
|
|
476 | |
|
|
477 | Replace the current C<on_starttls> callback (see the C<on_starttls> constructor argument). |
|
|
478 | |
|
|
479 | =cut |
|
|
480 | |
|
|
481 | sub on_starttls { |
|
|
482 | $_[0]{on_starttls} = $_[1]; |
|
|
483 | } |
|
|
484 | |
|
|
485 | =item $handle->on_stoptls ($cb) |
|
|
486 | |
|
|
487 | Replace the current C<on_stoptls> callback (see the C<on_stoptls> constructor argument). |
|
|
488 | |
|
|
489 | =cut |
|
|
490 | |
|
|
491 | sub on_starttls { |
|
|
492 | $_[0]{on_stoptls} = $_[1]; |
|
|
493 | } |
|
|
494 | |
|
|
495 | ############################################################################# |
|
|
496 | |
|
|
497 | =item $handle->timeout ($seconds) |
|
|
498 | |
|
|
499 | Configures (or disables) the inactivity timeout. |
|
|
500 | |
|
|
501 | =cut |
|
|
502 | |
|
|
503 | sub timeout { |
|
|
504 | my ($self, $timeout) = @_; |
|
|
505 | |
|
|
506 | $self->{timeout} = $timeout; |
|
|
507 | $self->_timeout; |
|
|
508 | } |
|
|
509 | |
|
|
510 | # reset the timeout watcher, as neccessary |
|
|
511 | # also check for time-outs |
|
|
512 | sub _timeout { |
|
|
513 | my ($self) = @_; |
|
|
514 | |
|
|
515 | if ($self->{timeout}) { |
|
|
516 | my $NOW = AnyEvent->now; |
|
|
517 | |
|
|
518 | # when would the timeout trigger? |
|
|
519 | my $after = $self->{_activity} + $self->{timeout} - $NOW; |
|
|
520 | |
|
|
521 | # now or in the past already? |
|
|
522 | if ($after <= 0) { |
|
|
523 | $self->{_activity} = $NOW; |
|
|
524 | |
|
|
525 | if ($self->{on_timeout}) { |
|
|
526 | $self->{on_timeout}($self); |
|
|
527 | } else { |
|
|
528 | $self->_error (Errno::ETIMEDOUT); |
|
|
529 | } |
|
|
530 | |
|
|
531 | # callback could have changed timeout value, optimise |
|
|
532 | return unless $self->{timeout}; |
|
|
533 | |
|
|
534 | # calculate new after |
|
|
535 | $after = $self->{timeout}; |
|
|
536 | } |
|
|
537 | |
|
|
538 | Scalar::Util::weaken $self; |
|
|
539 | return unless $self; # ->error could have destroyed $self |
|
|
540 | |
|
|
541 | $self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub { |
|
|
542 | delete $self->{_tw}; |
|
|
543 | $self->_timeout; |
|
|
544 | }); |
|
|
545 | } else { |
|
|
546 | delete $self->{_tw}; |
|
|
547 | } |
|
|
548 | } |
|
|
549 | |
249 | ############################################################################# |
550 | ############################################################################# |
250 | |
551 | |
251 | =back |
552 | =back |
252 | |
553 | |
253 | =head2 WRITE QUEUE |
554 | =head2 WRITE QUEUE |
… | |
… | |
274 | my ($self, $cb) = @_; |
575 | my ($self, $cb) = @_; |
275 | |
576 | |
276 | $self->{on_drain} = $cb; |
577 | $self->{on_drain} = $cb; |
277 | |
578 | |
278 | $cb->($self) |
579 | $cb->($self) |
279 | if $cb && $self->{low_water_mark} >= length $self->{wbuf}; |
580 | if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf}); |
280 | } |
581 | } |
281 | |
582 | |
282 | =item $handle->push_write ($data) |
583 | =item $handle->push_write ($data) |
283 | |
584 | |
284 | Queues the given scalar to be written. You can push as much data as you |
585 | Queues the given scalar to be written. You can push as much data as you |
… | |
… | |
288 | =cut |
589 | =cut |
289 | |
590 | |
290 | sub _drain_wbuf { |
591 | sub _drain_wbuf { |
291 | my ($self) = @_; |
592 | my ($self) = @_; |
292 | |
593 | |
293 | if (!$self->{ww} && length $self->{wbuf}) { |
594 | if (!$self->{_ww} && length $self->{wbuf}) { |
|
|
595 | |
294 | Scalar::Util::weaken $self; |
596 | Scalar::Util::weaken $self; |
|
|
597 | |
295 | my $cb = sub { |
598 | my $cb = sub { |
296 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
599 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
297 | |
600 | |
298 | if ($len >= 0) { |
601 | if (defined $len) { |
299 | substr $self->{wbuf}, 0, $len, ""; |
602 | substr $self->{wbuf}, 0, $len, ""; |
300 | |
603 | |
|
|
604 | $self->{_activity} = AnyEvent->now; |
|
|
605 | |
301 | $self->{on_drain}($self) |
606 | $self->{on_drain}($self) |
302 | if $self->{low_water_mark} >= length $self->{wbuf} |
607 | if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf}) |
303 | && $self->{on_drain}; |
608 | && $self->{on_drain}; |
304 | |
609 | |
305 | delete $self->{ww} unless length $self->{wbuf}; |
610 | delete $self->{_ww} unless length $self->{wbuf}; |
306 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAWOULDBLOCK) { |
611 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
307 | $self->error; |
612 | $self->_error ($!, 1); |
308 | } |
613 | } |
309 | }; |
614 | }; |
310 | |
615 | |
|
|
616 | # try to write data immediately |
|
|
617 | $cb->() unless $self->{autocork}; |
|
|
618 | |
|
|
619 | # if still data left in wbuf, we need to poll |
311 | $self->{ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb); |
620 | $self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb) |
312 | |
621 | if length $self->{wbuf}; |
313 | $cb->($self); |
|
|
314 | }; |
622 | }; |
315 | } |
623 | } |
316 | |
624 | |
317 | our %WH; |
625 | our %WH; |
318 | |
626 | |
… | |
… | |
328 | |
636 | |
329 | @_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write") |
637 | @_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write") |
330 | ->($self, @_); |
638 | ->($self, @_); |
331 | } |
639 | } |
332 | |
640 | |
333 | if ($self->{filter_w}) { |
641 | if ($self->{tls}) { |
334 | $self->{filter_w}->($self, \$_[0]); |
642 | $self->{_tls_wbuf} .= $_[0]; |
|
|
643 | |
|
|
644 | &_dotls ($self); |
335 | } else { |
645 | } else { |
336 | $self->{wbuf} .= $_[0]; |
646 | $self->{wbuf} .= $_[0]; |
337 | $self->_drain_wbuf; |
647 | $self->_drain_wbuf; |
338 | } |
648 | } |
339 | } |
649 | } |
340 | |
650 | |
341 | =item $handle->push_write (type => @args) |
651 | =item $handle->push_write (type => @args) |
342 | |
652 | |
343 | =item $handle->unshift_write (type => @args) |
|
|
344 | |
|
|
345 | Instead of formatting your data yourself, you can also let this module do |
653 | Instead of formatting your data yourself, you can also let this module do |
346 | the job by specifying a type and type-specific arguments. |
654 | the job by specifying a type and type-specific arguments. |
347 | |
655 | |
348 | Predefined types are (if you have ideas for additional types, feel free to |
656 | Predefined types are (if you have ideas for additional types, feel free to |
349 | drop by and tell us): |
657 | drop by and tell us): |
… | |
… | |
353 | =item netstring => $string |
661 | =item netstring => $string |
354 | |
662 | |
355 | Formats the given value as netstring |
663 | Formats the given value as netstring |
356 | (http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them). |
664 | (http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them). |
357 | |
665 | |
358 | =back |
|
|
359 | |
|
|
360 | =cut |
666 | =cut |
361 | |
667 | |
362 | register_write_type netstring => sub { |
668 | register_write_type netstring => sub { |
363 | my ($self, $string) = @_; |
669 | my ($self, $string) = @_; |
364 | |
670 | |
365 | sprintf "%d:%s,", (length $string), $string |
671 | (length $string) . ":$string," |
366 | }; |
672 | }; |
367 | |
673 | |
|
|
674 | =item packstring => $format, $data |
|
|
675 | |
|
|
676 | An octet string prefixed with an encoded length. The encoding C<$format> |
|
|
677 | uses the same format as a Perl C<pack> format, but must specify a single |
|
|
678 | integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an |
|
|
679 | optional C<!>, C<< < >> or C<< > >> modifier). |
|
|
680 | |
|
|
681 | =cut |
|
|
682 | |
|
|
683 | register_write_type packstring => sub { |
|
|
684 | my ($self, $format, $string) = @_; |
|
|
685 | |
|
|
686 | pack "$format/a*", $string |
|
|
687 | }; |
|
|
688 | |
|
|
689 | =item json => $array_or_hashref |
|
|
690 | |
|
|
691 | Encodes the given hash or array reference into a JSON object. Unless you |
|
|
692 | provide your own JSON object, this means it will be encoded to JSON text |
|
|
693 | in UTF-8. |
|
|
694 | |
|
|
695 | JSON objects (and arrays) are self-delimiting, so you can write JSON at |
|
|
696 | one end of a handle and read them at the other end without using any |
|
|
697 | additional framing. |
|
|
698 | |
|
|
699 | The generated JSON text is guaranteed not to contain any newlines: While |
|
|
700 | this module doesn't need delimiters after or between JSON texts to be |
|
|
701 | able to read them, many other languages depend on that. |
|
|
702 | |
|
|
703 | A simple RPC protocol that interoperates easily with others is to send |
|
|
704 | JSON arrays (or objects, although arrays are usually the better choice as |
|
|
705 | they mimic how function argument passing works) and a newline after each |
|
|
706 | JSON text: |
|
|
707 | |
|
|
708 | $handle->push_write (json => ["method", "arg1", "arg2"]); # whatever |
|
|
709 | $handle->push_write ("\012"); |
|
|
710 | |
|
|
711 | An AnyEvent::Handle receiver would simply use the C<json> read type and |
|
|
712 | rely on the fact that the newline will be skipped as leading whitespace: |
|
|
713 | |
|
|
714 | $handle->push_read (json => sub { my $array = $_[1]; ... }); |
|
|
715 | |
|
|
716 | Other languages could read single lines terminated by a newline and pass |
|
|
717 | this line into their JSON decoder of choice. |
|
|
718 | |
|
|
719 | =cut |
|
|
720 | |
|
|
721 | register_write_type json => sub { |
|
|
722 | my ($self, $ref) = @_; |
|
|
723 | |
|
|
724 | require JSON; |
|
|
725 | |
|
|
726 | $self->{json} ? $self->{json}->encode ($ref) |
|
|
727 | : JSON::encode_json ($ref) |
|
|
728 | }; |
|
|
729 | |
|
|
730 | =item storable => $reference |
|
|
731 | |
|
|
732 | Freezes the given reference using L<Storable> and writes it to the |
|
|
733 | handle. Uses the C<nfreeze> format. |
|
|
734 | |
|
|
735 | =cut |
|
|
736 | |
|
|
737 | register_write_type storable => sub { |
|
|
738 | my ($self, $ref) = @_; |
|
|
739 | |
|
|
740 | require Storable; |
|
|
741 | |
|
|
742 | pack "w/a*", Storable::nfreeze ($ref) |
|
|
743 | }; |
|
|
744 | |
|
|
745 | =back |
|
|
746 | |
|
|
747 | =item $handle->push_shutdown |
|
|
748 | |
|
|
749 | Sometimes you know you want to close the socket after writing your data |
|
|
750 | before it was actually written. One way to do that is to replace your |
|
|
751 | C<on_drain> handler by a callback that shuts down the socket (and set |
|
|
752 | C<low_water_mark> to C<0>). This method is a shorthand for just that, and |
|
|
753 | replaces the C<on_drain> callback with: |
|
|
754 | |
|
|
755 | sub { shutdown $_[0]{fh}, 1 } # for push_shutdown |
|
|
756 | |
|
|
757 | This simply shuts down the write side and signals an EOF condition to the |
|
|
758 | the peer. |
|
|
759 | |
|
|
760 | You can rely on the normal read queue and C<on_eof> handling |
|
|
761 | afterwards. This is the cleanest way to close a connection. |
|
|
762 | |
|
|
763 | =cut |
|
|
764 | |
|
|
765 | sub push_shutdown { |
|
|
766 | my ($self) = @_; |
|
|
767 | |
|
|
768 | delete $self->{low_water_mark}; |
|
|
769 | $self->on_drain (sub { shutdown $_[0]{fh}, 1 }); |
|
|
770 | } |
|
|
771 | |
368 | =item AnyEvent::Handle::register_write_type type => $coderef->($self, @args) |
772 | =item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args) |
369 | |
773 | |
370 | This function (not method) lets you add your own types to C<push_write>. |
774 | This function (not method) lets you add your own types to C<push_write>. |
371 | Whenever the given C<type> is used, C<push_write> will invoke the code |
775 | Whenever the given C<type> is used, C<push_write> will invoke the code |
372 | reference with the handle object and the remaining arguments. |
776 | reference with the handle object and the remaining arguments. |
373 | |
777 | |
… | |
… | |
392 | ways, the "simple" way, using only C<on_read> and the "complex" way, using |
796 | ways, the "simple" way, using only C<on_read> and the "complex" way, using |
393 | a queue. |
797 | a queue. |
394 | |
798 | |
395 | In the simple case, you just install an C<on_read> callback and whenever |
799 | In the simple case, you just install an C<on_read> callback and whenever |
396 | new data arrives, it will be called. You can then remove some data (if |
800 | new data arrives, it will be called. You can then remove some data (if |
397 | enough is there) from the read buffer (C<< $handle->rbuf >>) if you want |
801 | enough is there) from the read buffer (C<< $handle->rbuf >>). Or you cna |
398 | or not. |
802 | leave the data there if you want to accumulate more (e.g. when only a |
|
|
803 | partial message has been received so far). |
399 | |
804 | |
400 | In the more complex case, you want to queue multiple callbacks. In this |
805 | In the more complex case, you want to queue multiple callbacks. In this |
401 | case, AnyEvent::Handle will call the first queued callback each time new |
806 | case, AnyEvent::Handle will call the first queued callback each time new |
402 | data arrives and removes it when it has done its job (see C<push_read>, |
807 | data arrives (also the first time it is queued) and removes it when it has |
403 | below). |
808 | done its job (see C<push_read>, below). |
404 | |
809 | |
405 | This way you can, for example, push three line-reads, followed by reading |
810 | This way you can, for example, push three line-reads, followed by reading |
406 | a chunk of data, and AnyEvent::Handle will execute them in order. |
811 | a chunk of data, and AnyEvent::Handle will execute them in order. |
407 | |
812 | |
408 | Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by |
813 | Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by |
409 | the specified number of bytes which give an XML datagram. |
814 | the specified number of bytes which give an XML datagram. |
410 | |
815 | |
411 | # in the default state, expect some header bytes |
816 | # in the default state, expect some header bytes |
412 | $handle->on_read (sub { |
817 | $handle->on_read (sub { |
413 | # some data is here, now queue the length-header-read (4 octets) |
818 | # some data is here, now queue the length-header-read (4 octets) |
414 | shift->unshift_read_chunk (4, sub { |
819 | shift->unshift_read (chunk => 4, sub { |
415 | # header arrived, decode |
820 | # header arrived, decode |
416 | my $len = unpack "N", $_[1]; |
821 | my $len = unpack "N", $_[1]; |
417 | |
822 | |
418 | # now read the payload |
823 | # now read the payload |
419 | shift->unshift_read_chunk ($len, sub { |
824 | shift->unshift_read (chunk => $len, sub { |
420 | my $xml = $_[1]; |
825 | my $xml = $_[1]; |
421 | # handle xml |
826 | # handle xml |
422 | }); |
827 | }); |
423 | }); |
828 | }); |
424 | }); |
829 | }); |
425 | |
830 | |
426 | Example 2: Implement a client for a protocol that replies either with |
831 | Example 2: Implement a client for a protocol that replies either with "OK" |
427 | "OK" and another line or "ERROR" for one request, and 64 bytes for the |
832 | and another line or "ERROR" for the first request that is sent, and 64 |
428 | second request. Due tot he availability of a full queue, we can just |
833 | bytes for the second request. Due to the availability of a queue, we can |
429 | pipeline sending both requests and manipulate the queue as necessary in |
834 | just pipeline sending both requests and manipulate the queue as necessary |
430 | the callbacks: |
835 | in the callbacks. |
431 | |
836 | |
432 | # request one |
837 | When the first callback is called and sees an "OK" response, it will |
|
|
838 | C<unshift> another line-read. This line-read will be queued I<before> the |
|
|
839 | 64-byte chunk callback. |
|
|
840 | |
|
|
841 | # request one, returns either "OK + extra line" or "ERROR" |
433 | $handle->push_write ("request 1\015\012"); |
842 | $handle->push_write ("request 1\015\012"); |
434 | |
843 | |
435 | # we expect "ERROR" or "OK" as response, so push a line read |
844 | # we expect "ERROR" or "OK" as response, so push a line read |
436 | $handle->push_read_line (sub { |
845 | $handle->push_read (line => sub { |
437 | # if we got an "OK", we have to _prepend_ another line, |
846 | # if we got an "OK", we have to _prepend_ another line, |
438 | # so it will be read before the second request reads its 64 bytes |
847 | # so it will be read before the second request reads its 64 bytes |
439 | # which are already in the queue when this callback is called |
848 | # which are already in the queue when this callback is called |
440 | # we don't do this in case we got an error |
849 | # we don't do this in case we got an error |
441 | if ($_[1] eq "OK") { |
850 | if ($_[1] eq "OK") { |
442 | $_[0]->unshift_read_line (sub { |
851 | $_[0]->unshift_read (line => sub { |
443 | my $response = $_[1]; |
852 | my $response = $_[1]; |
444 | ... |
853 | ... |
445 | }); |
854 | }); |
446 | } |
855 | } |
447 | }); |
856 | }); |
448 | |
857 | |
449 | # request two |
858 | # request two, simply returns 64 octets |
450 | $handle->push_write ("request 2\015\012"); |
859 | $handle->push_write ("request 2\015\012"); |
451 | |
860 | |
452 | # simply read 64 bytes, always |
861 | # simply read 64 bytes, always |
453 | $handle->push_read_chunk (64, sub { |
862 | $handle->push_read (chunk => 64, sub { |
454 | my $response = $_[1]; |
863 | my $response = $_[1]; |
455 | ... |
864 | ... |
456 | }); |
865 | }); |
457 | |
866 | |
458 | =over 4 |
867 | =over 4 |
459 | |
868 | |
460 | =cut |
869 | =cut |
461 | |
870 | |
462 | sub _drain_rbuf { |
871 | sub _drain_rbuf { |
463 | my ($self) = @_; |
872 | my ($self) = @_; |
|
|
873 | |
|
|
874 | local $self->{_in_drain} = 1; |
464 | |
875 | |
465 | if ( |
876 | if ( |
466 | defined $self->{rbuf_max} |
877 | defined $self->{rbuf_max} |
467 | && $self->{rbuf_max} < length $self->{rbuf} |
878 | && $self->{rbuf_max} < length $self->{rbuf} |
468 | ) { |
879 | ) { |
469 | $! = &Errno::ENOSPC; return $self->error; |
880 | $self->_error (Errno::ENOSPC, 1), return; |
470 | } |
881 | } |
471 | |
882 | |
472 | return if $self->{in_drain}; |
883 | while () { |
473 | local $self->{in_drain} = 1; |
884 | # we need to use a separate tls read buffer, as we must not receive data while |
|
|
885 | # we are draining the buffer, and this can only happen with TLS. |
|
|
886 | $self->{rbuf} .= delete $self->{_tls_rbuf} if exists $self->{_tls_rbuf}; |
474 | |
887 | |
475 | while (my $len = length $self->{rbuf}) { |
888 | my $len = length $self->{rbuf}; |
476 | no strict 'refs'; |
889 | |
477 | if (my $cb = shift @{ $self->{queue} }) { |
890 | if (my $cb = shift @{ $self->{_queue} }) { |
478 | unless ($cb->($self)) { |
891 | unless ($cb->($self)) { |
479 | if ($self->{eof}) { |
892 | if ($self->{_eof}) { |
480 | # no progress can be made (not enough data and no data forthcoming) |
893 | # no progress can be made (not enough data and no data forthcoming) |
481 | $! = &Errno::EPIPE; return $self->error; |
894 | $self->_error (Errno::EPIPE, 1), return; |
482 | } |
895 | } |
483 | |
896 | |
484 | unshift @{ $self->{queue} }, $cb; |
897 | unshift @{ $self->{_queue} }, $cb; |
485 | return; |
898 | last; |
486 | } |
899 | } |
487 | } elsif ($self->{on_read}) { |
900 | } elsif ($self->{on_read}) { |
|
|
901 | last unless $len; |
|
|
902 | |
488 | $self->{on_read}($self); |
903 | $self->{on_read}($self); |
489 | |
904 | |
490 | if ( |
905 | if ( |
491 | $self->{eof} # if no further data will arrive |
|
|
492 | && $len == length $self->{rbuf} # and no data has been consumed |
906 | $len == length $self->{rbuf} # if no data has been consumed |
493 | && !@{ $self->{queue} } # and the queue is still empty |
907 | && !@{ $self->{_queue} } # and the queue is still empty |
494 | && $self->{on_read} # and we still want to read data |
908 | && $self->{on_read} # but we still have on_read |
495 | ) { |
909 | ) { |
|
|
910 | # no further data will arrive |
496 | # then no progress can be made |
911 | # so no progress can be made |
497 | $! = &Errno::EPIPE; return $self->error; |
912 | $self->_error (Errno::EPIPE, 1), return |
|
|
913 | if $self->{_eof}; |
|
|
914 | |
|
|
915 | last; # more data might arrive |
498 | } |
916 | } |
499 | } else { |
917 | } else { |
500 | # read side becomes idle |
918 | # read side becomes idle |
501 | delete $self->{rw}; |
919 | delete $self->{_rw} unless $self->{tls}; |
502 | return; |
920 | last; |
503 | } |
921 | } |
504 | } |
922 | } |
505 | |
923 | |
506 | if ($self->{eof}) { |
924 | if ($self->{_eof}) { |
507 | $self->_shutdown; |
925 | if ($self->{on_eof}) { |
508 | $self->{on_eof}($self) |
926 | $self->{on_eof}($self) |
509 | if $self->{on_eof}; |
927 | } else { |
|
|
928 | $self->_error (0, 1, "Unexpected end-of-file"); |
|
|
929 | } |
|
|
930 | } |
|
|
931 | |
|
|
932 | # may need to restart read watcher |
|
|
933 | unless ($self->{_rw}) { |
|
|
934 | $self->start_read |
|
|
935 | if $self->{on_read} || @{ $self->{_queue} }; |
510 | } |
936 | } |
511 | } |
937 | } |
512 | |
938 | |
513 | =item $handle->on_read ($cb) |
939 | =item $handle->on_read ($cb) |
514 | |
940 | |
… | |
… | |
520 | |
946 | |
521 | sub on_read { |
947 | sub on_read { |
522 | my ($self, $cb) = @_; |
948 | my ($self, $cb) = @_; |
523 | |
949 | |
524 | $self->{on_read} = $cb; |
950 | $self->{on_read} = $cb; |
|
|
951 | $self->_drain_rbuf if $cb && !$self->{_in_drain}; |
525 | } |
952 | } |
526 | |
953 | |
527 | =item $handle->rbuf |
954 | =item $handle->rbuf |
528 | |
955 | |
529 | Returns the read buffer (as a modifiable lvalue). |
956 | Returns the read buffer (as a modifiable lvalue). |
530 | |
957 | |
531 | You can access the read buffer directly as the C<< ->{rbuf} >> member, if |
958 | You can access the read buffer directly as the C<< ->{rbuf} >> |
532 | you want. |
959 | member, if you want. However, the only operation allowed on the |
|
|
960 | read buffer (apart from looking at it) is removing data from its |
|
|
961 | beginning. Otherwise modifying or appending to it is not allowed and will |
|
|
962 | lead to hard-to-track-down bugs. |
533 | |
963 | |
534 | NOTE: The read buffer should only be used or modified if the C<on_read>, |
964 | NOTE: The read buffer should only be used or modified if the C<on_read>, |
535 | C<push_read> or C<unshift_read> methods are used. The other read methods |
965 | C<push_read> or C<unshift_read> methods are used. The other read methods |
536 | automatically manage the read buffer. |
966 | automatically manage the read buffer. |
537 | |
967 | |
… | |
… | |
577 | |
1007 | |
578 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read") |
1008 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read") |
579 | ->($self, $cb, @_); |
1009 | ->($self, $cb, @_); |
580 | } |
1010 | } |
581 | |
1011 | |
582 | push @{ $self->{queue} }, $cb; |
1012 | push @{ $self->{_queue} }, $cb; |
583 | $self->_drain_rbuf; |
1013 | $self->_drain_rbuf unless $self->{_in_drain}; |
584 | } |
1014 | } |
585 | |
1015 | |
586 | sub unshift_read { |
1016 | sub unshift_read { |
587 | my $self = shift; |
1017 | my $self = shift; |
588 | my $cb = pop; |
1018 | my $cb = pop; |
… | |
… | |
593 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read") |
1023 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read") |
594 | ->($self, $cb, @_); |
1024 | ->($self, $cb, @_); |
595 | } |
1025 | } |
596 | |
1026 | |
597 | |
1027 | |
598 | unshift @{ $self->{queue} }, $cb; |
1028 | unshift @{ $self->{_queue} }, $cb; |
599 | $self->_drain_rbuf; |
1029 | $self->_drain_rbuf unless $self->{_in_drain}; |
600 | } |
1030 | } |
601 | |
1031 | |
602 | =item $handle->push_read (type => @args, $cb) |
1032 | =item $handle->push_read (type => @args, $cb) |
603 | |
1033 | |
604 | =item $handle->unshift_read (type => @args, $cb) |
1034 | =item $handle->unshift_read (type => @args, $cb) |
… | |
… | |
610 | Predefined types are (if you have ideas for additional types, feel free to |
1040 | Predefined types are (if you have ideas for additional types, feel free to |
611 | drop by and tell us): |
1041 | drop by and tell us): |
612 | |
1042 | |
613 | =over 4 |
1043 | =over 4 |
614 | |
1044 | |
615 | =item chunk => $octets, $cb->($self, $data) |
1045 | =item chunk => $octets, $cb->($handle, $data) |
616 | |
1046 | |
617 | Invoke the callback only once C<$octets> bytes have been read. Pass the |
1047 | Invoke the callback only once C<$octets> bytes have been read. Pass the |
618 | data read to the callback. The callback will never be called with less |
1048 | data read to the callback. The callback will never be called with less |
619 | data. |
1049 | data. |
620 | |
1050 | |
… | |
… | |
634 | $cb->($_[0], substr $_[0]{rbuf}, 0, $len, ""); |
1064 | $cb->($_[0], substr $_[0]{rbuf}, 0, $len, ""); |
635 | 1 |
1065 | 1 |
636 | } |
1066 | } |
637 | }; |
1067 | }; |
638 | |
1068 | |
639 | # compatibility with older API |
|
|
640 | sub push_read_chunk { |
|
|
641 | $_[0]->push_read (chunk => $_[1], $_[2]); |
|
|
642 | } |
|
|
643 | |
|
|
644 | sub unshift_read_chunk { |
|
|
645 | $_[0]->unshift_read (chunk => $_[1], $_[2]); |
|
|
646 | } |
|
|
647 | |
|
|
648 | =item line => [$eol, ]$cb->($self, $line, $eol) |
1069 | =item line => [$eol, ]$cb->($handle, $line, $eol) |
649 | |
1070 | |
650 | The callback will be called only once a full line (including the end of |
1071 | The callback will be called only once a full line (including the end of |
651 | line marker, C<$eol>) has been read. This line (excluding the end of line |
1072 | line marker, C<$eol>) has been read. This line (excluding the end of line |
652 | marker) will be passed to the callback as second argument (C<$line>), and |
1073 | marker) will be passed to the callback as second argument (C<$line>), and |
653 | the end of line marker as the third argument (C<$eol>). |
1074 | the end of line marker as the third argument (C<$eol>). |
… | |
… | |
667 | =cut |
1088 | =cut |
668 | |
1089 | |
669 | register_read_type line => sub { |
1090 | register_read_type line => sub { |
670 | my ($self, $cb, $eol) = @_; |
1091 | my ($self, $cb, $eol) = @_; |
671 | |
1092 | |
672 | $eol = qr|(\015?\012)| if @_ < 3; |
1093 | if (@_ < 3) { |
|
|
1094 | # this is more than twice as fast as the generic code below |
|
|
1095 | sub { |
|
|
1096 | $_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return; |
|
|
1097 | |
|
|
1098 | $cb->($_[0], $1, $2); |
|
|
1099 | 1 |
|
|
1100 | } |
|
|
1101 | } else { |
673 | $eol = quotemeta $eol unless ref $eol; |
1102 | $eol = quotemeta $eol unless ref $eol; |
674 | $eol = qr|^(.*?)($eol)|s; |
1103 | $eol = qr|^(.*?)($eol)|s; |
|
|
1104 | |
|
|
1105 | sub { |
|
|
1106 | $_[0]{rbuf} =~ s/$eol// or return; |
|
|
1107 | |
|
|
1108 | $cb->($_[0], $1, $2); |
|
|
1109 | 1 |
|
|
1110 | } |
|
|
1111 | } |
|
|
1112 | }; |
|
|
1113 | |
|
|
1114 | =item regex => $accept[, $reject[, $skip], $cb->($handle, $data) |
|
|
1115 | |
|
|
1116 | Makes a regex match against the regex object C<$accept> and returns |
|
|
1117 | everything up to and including the match. |
|
|
1118 | |
|
|
1119 | Example: read a single line terminated by '\n'. |
|
|
1120 | |
|
|
1121 | $handle->push_read (regex => qr<\n>, sub { ... }); |
|
|
1122 | |
|
|
1123 | If C<$reject> is given and not undef, then it determines when the data is |
|
|
1124 | to be rejected: it is matched against the data when the C<$accept> regex |
|
|
1125 | does not match and generates an C<EBADMSG> error when it matches. This is |
|
|
1126 | useful to quickly reject wrong data (to avoid waiting for a timeout or a |
|
|
1127 | receive buffer overflow). |
|
|
1128 | |
|
|
1129 | Example: expect a single decimal number followed by whitespace, reject |
|
|
1130 | anything else (not the use of an anchor). |
|
|
1131 | |
|
|
1132 | $handle->push_read (regex => qr<^[0-9]+\s>, qr<[^0-9]>, sub { ... }); |
|
|
1133 | |
|
|
1134 | If C<$skip> is given and not C<undef>, then it will be matched against |
|
|
1135 | the receive buffer when neither C<$accept> nor C<$reject> match, |
|
|
1136 | and everything preceding and including the match will be accepted |
|
|
1137 | unconditionally. This is useful to skip large amounts of data that you |
|
|
1138 | know cannot be matched, so that the C<$accept> or C<$reject> regex do not |
|
|
1139 | have to start matching from the beginning. This is purely an optimisation |
|
|
1140 | and is usually worth only when you expect more than a few kilobytes. |
|
|
1141 | |
|
|
1142 | Example: expect a http header, which ends at C<\015\012\015\012>. Since we |
|
|
1143 | expect the header to be very large (it isn't in practise, but...), we use |
|
|
1144 | a skip regex to skip initial portions. The skip regex is tricky in that |
|
|
1145 | it only accepts something not ending in either \015 or \012, as these are |
|
|
1146 | required for the accept regex. |
|
|
1147 | |
|
|
1148 | $handle->push_read (regex => |
|
|
1149 | qr<\015\012\015\012>, |
|
|
1150 | undef, # no reject |
|
|
1151 | qr<^.*[^\015\012]>, |
|
|
1152 | sub { ... }); |
|
|
1153 | |
|
|
1154 | =cut |
|
|
1155 | |
|
|
1156 | register_read_type regex => sub { |
|
|
1157 | my ($self, $cb, $accept, $reject, $skip) = @_; |
|
|
1158 | |
|
|
1159 | my $data; |
|
|
1160 | my $rbuf = \$self->{rbuf}; |
675 | |
1161 | |
676 | sub { |
1162 | sub { |
677 | $_[0]{rbuf} =~ s/$eol// or return; |
1163 | # accept |
678 | |
1164 | if ($$rbuf =~ $accept) { |
679 | $cb->($_[0], $1, $2); |
1165 | $data .= substr $$rbuf, 0, $+[0], ""; |
|
|
1166 | $cb->($self, $data); |
|
|
1167 | return 1; |
|
|
1168 | } |
680 | 1 |
1169 | |
|
|
1170 | # reject |
|
|
1171 | if ($reject && $$rbuf =~ $reject) { |
|
|
1172 | $self->_error (Errno::EBADMSG); |
|
|
1173 | } |
|
|
1174 | |
|
|
1175 | # skip |
|
|
1176 | if ($skip && $$rbuf =~ $skip) { |
|
|
1177 | $data .= substr $$rbuf, 0, $+[0], ""; |
|
|
1178 | } |
|
|
1179 | |
|
|
1180 | () |
681 | } |
1181 | } |
682 | }; |
1182 | }; |
683 | |
1183 | |
684 | # compatibility with older API |
|
|
685 | sub push_read_line { |
|
|
686 | my $self = shift; |
|
|
687 | $self->push_read (line => @_); |
|
|
688 | } |
|
|
689 | |
|
|
690 | sub unshift_read_line { |
|
|
691 | my $self = shift; |
|
|
692 | $self->unshift_read (line => @_); |
|
|
693 | } |
|
|
694 | |
|
|
695 | =item netstring => $cb->($string) |
1184 | =item netstring => $cb->($handle, $string) |
696 | |
1185 | |
697 | A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement). |
1186 | A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement). |
698 | |
1187 | |
699 | Throws an error with C<$!> set to EBADMSG on format violations. |
1188 | Throws an error with C<$!> set to EBADMSG on format violations. |
700 | |
1189 | |
… | |
… | |
704 | my ($self, $cb) = @_; |
1193 | my ($self, $cb) = @_; |
705 | |
1194 | |
706 | sub { |
1195 | sub { |
707 | unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) { |
1196 | unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) { |
708 | if ($_[0]{rbuf} =~ /[^0-9]/) { |
1197 | if ($_[0]{rbuf} =~ /[^0-9]/) { |
709 | $! = &Errno::EBADMSG; |
1198 | $self->_error (Errno::EBADMSG); |
710 | $self->error; |
|
|
711 | } |
1199 | } |
712 | return; |
1200 | return; |
713 | } |
1201 | } |
714 | |
1202 | |
715 | my $len = $1; |
1203 | my $len = $1; |
… | |
… | |
718 | my $string = $_[1]; |
1206 | my $string = $_[1]; |
719 | $_[0]->unshift_read (chunk => 1, sub { |
1207 | $_[0]->unshift_read (chunk => 1, sub { |
720 | if ($_[1] eq ",") { |
1208 | if ($_[1] eq ",") { |
721 | $cb->($_[0], $string); |
1209 | $cb->($_[0], $string); |
722 | } else { |
1210 | } else { |
723 | $! = &Errno::EBADMSG; |
|
|
724 | $self->error; |
1211 | $self->_error (Errno::EBADMSG); |
725 | } |
1212 | } |
726 | }); |
1213 | }); |
727 | }); |
1214 | }); |
728 | |
1215 | |
729 | 1 |
1216 | 1 |
730 | } |
1217 | } |
731 | }; |
1218 | }; |
732 | |
1219 | |
|
|
1220 | =item packstring => $format, $cb->($handle, $string) |
|
|
1221 | |
|
|
1222 | An octet string prefixed with an encoded length. The encoding C<$format> |
|
|
1223 | uses the same format as a Perl C<pack> format, but must specify a single |
|
|
1224 | integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an |
|
|
1225 | optional C<!>, C<< < >> or C<< > >> modifier). |
|
|
1226 | |
|
|
1227 | For example, DNS over TCP uses a prefix of C<n> (2 octet network order), |
|
|
1228 | EPP uses a prefix of C<N> (4 octtes). |
|
|
1229 | |
|
|
1230 | Example: read a block of data prefixed by its length in BER-encoded |
|
|
1231 | format (very efficient). |
|
|
1232 | |
|
|
1233 | $handle->push_read (packstring => "w", sub { |
|
|
1234 | my ($handle, $data) = @_; |
|
|
1235 | }); |
|
|
1236 | |
|
|
1237 | =cut |
|
|
1238 | |
|
|
1239 | register_read_type packstring => sub { |
|
|
1240 | my ($self, $cb, $format) = @_; |
|
|
1241 | |
|
|
1242 | sub { |
|
|
1243 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
|
|
1244 | defined (my $len = eval { unpack $format, $_[0]{rbuf} }) |
|
|
1245 | or return; |
|
|
1246 | |
|
|
1247 | $format = length pack $format, $len; |
|
|
1248 | |
|
|
1249 | # bypass unshift if we already have the remaining chunk |
|
|
1250 | if ($format + $len <= length $_[0]{rbuf}) { |
|
|
1251 | my $data = substr $_[0]{rbuf}, $format, $len; |
|
|
1252 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
|
|
1253 | $cb->($_[0], $data); |
|
|
1254 | } else { |
|
|
1255 | # remove prefix |
|
|
1256 | substr $_[0]{rbuf}, 0, $format, ""; |
|
|
1257 | |
|
|
1258 | # read remaining chunk |
|
|
1259 | $_[0]->unshift_read (chunk => $len, $cb); |
|
|
1260 | } |
|
|
1261 | |
|
|
1262 | 1 |
|
|
1263 | } |
|
|
1264 | }; |
|
|
1265 | |
|
|
1266 | =item json => $cb->($handle, $hash_or_arrayref) |
|
|
1267 | |
|
|
1268 | Reads a JSON object or array, decodes it and passes it to the |
|
|
1269 | callback. When a parse error occurs, an C<EBADMSG> error will be raised. |
|
|
1270 | |
|
|
1271 | If a C<json> object was passed to the constructor, then that will be used |
|
|
1272 | for the final decode, otherwise it will create a JSON coder expecting UTF-8. |
|
|
1273 | |
|
|
1274 | This read type uses the incremental parser available with JSON version |
|
|
1275 | 2.09 (and JSON::XS version 2.2) and above. You have to provide a |
|
|
1276 | dependency on your own: this module will load the JSON module, but |
|
|
1277 | AnyEvent does not depend on it itself. |
|
|
1278 | |
|
|
1279 | Since JSON texts are fully self-delimiting, the C<json> read and write |
|
|
1280 | types are an ideal simple RPC protocol: just exchange JSON datagrams. See |
|
|
1281 | the C<json> write type description, above, for an actual example. |
|
|
1282 | |
|
|
1283 | =cut |
|
|
1284 | |
|
|
1285 | register_read_type json => sub { |
|
|
1286 | my ($self, $cb) = @_; |
|
|
1287 | |
|
|
1288 | my $json = $self->{json} ||= |
|
|
1289 | eval { require JSON::XS; JSON::XS->new->utf8 } |
|
|
1290 | || do { require JSON; JSON->new->utf8 }; |
|
|
1291 | |
|
|
1292 | my $data; |
|
|
1293 | my $rbuf = \$self->{rbuf}; |
|
|
1294 | |
|
|
1295 | sub { |
|
|
1296 | my $ref = eval { $json->incr_parse ($self->{rbuf}) }; |
|
|
1297 | |
|
|
1298 | if ($ref) { |
|
|
1299 | $self->{rbuf} = $json->incr_text; |
|
|
1300 | $json->incr_text = ""; |
|
|
1301 | $cb->($self, $ref); |
|
|
1302 | |
|
|
1303 | 1 |
|
|
1304 | } elsif ($@) { |
|
|
1305 | # error case |
|
|
1306 | $json->incr_skip; |
|
|
1307 | |
|
|
1308 | $self->{rbuf} = $json->incr_text; |
|
|
1309 | $json->incr_text = ""; |
|
|
1310 | |
|
|
1311 | $self->_error (Errno::EBADMSG); |
|
|
1312 | |
|
|
1313 | () |
|
|
1314 | } else { |
|
|
1315 | $self->{rbuf} = ""; |
|
|
1316 | |
|
|
1317 | () |
|
|
1318 | } |
|
|
1319 | } |
|
|
1320 | }; |
|
|
1321 | |
|
|
1322 | =item storable => $cb->($handle, $ref) |
|
|
1323 | |
|
|
1324 | Deserialises a L<Storable> frozen representation as written by the |
|
|
1325 | C<storable> write type (BER-encoded length prefix followed by nfreeze'd |
|
|
1326 | data). |
|
|
1327 | |
|
|
1328 | Raises C<EBADMSG> error if the data could not be decoded. |
|
|
1329 | |
|
|
1330 | =cut |
|
|
1331 | |
|
|
1332 | register_read_type storable => sub { |
|
|
1333 | my ($self, $cb) = @_; |
|
|
1334 | |
|
|
1335 | require Storable; |
|
|
1336 | |
|
|
1337 | sub { |
|
|
1338 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
|
|
1339 | defined (my $len = eval { unpack "w", $_[0]{rbuf} }) |
|
|
1340 | or return; |
|
|
1341 | |
|
|
1342 | my $format = length pack "w", $len; |
|
|
1343 | |
|
|
1344 | # bypass unshift if we already have the remaining chunk |
|
|
1345 | if ($format + $len <= length $_[0]{rbuf}) { |
|
|
1346 | my $data = substr $_[0]{rbuf}, $format, $len; |
|
|
1347 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
|
|
1348 | $cb->($_[0], Storable::thaw ($data)); |
|
|
1349 | } else { |
|
|
1350 | # remove prefix |
|
|
1351 | substr $_[0]{rbuf}, 0, $format, ""; |
|
|
1352 | |
|
|
1353 | # read remaining chunk |
|
|
1354 | $_[0]->unshift_read (chunk => $len, sub { |
|
|
1355 | if (my $ref = eval { Storable::thaw ($_[1]) }) { |
|
|
1356 | $cb->($_[0], $ref); |
|
|
1357 | } else { |
|
|
1358 | $self->_error (Errno::EBADMSG); |
|
|
1359 | } |
|
|
1360 | }); |
|
|
1361 | } |
|
|
1362 | |
|
|
1363 | 1 |
|
|
1364 | } |
|
|
1365 | }; |
|
|
1366 | |
733 | =back |
1367 | =back |
734 | |
1368 | |
735 | =item AnyEvent::Handle::register_read_type type => $coderef->($self, $cb, @args) |
1369 | =item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args) |
736 | |
1370 | |
737 | This function (not method) lets you add your own types to C<push_read>. |
1371 | This function (not method) lets you add your own types to C<push_read>. |
738 | |
1372 | |
739 | Whenever the given C<type> is used, C<push_read> will invoke the code |
1373 | Whenever the given C<type> is used, C<push_read> will invoke the code |
740 | reference with the handle object, the callback and the remaining |
1374 | reference with the handle object, the callback and the remaining |
… | |
… | |
742 | |
1376 | |
743 | The code reference is supposed to return a callback (usually a closure) |
1377 | The code reference is supposed to return a callback (usually a closure) |
744 | that works as a plain read callback (see C<< ->push_read ($cb) >>). |
1378 | that works as a plain read callback (see C<< ->push_read ($cb) >>). |
745 | |
1379 | |
746 | It should invoke the passed callback when it is done reading (remember to |
1380 | It should invoke the passed callback when it is done reading (remember to |
747 | pass C<$self> as first argument as all other callbacks do that). |
1381 | pass C<$handle> as first argument as all other callbacks do that). |
748 | |
1382 | |
749 | Note that this is a function, and all types registered this way will be |
1383 | Note that this is a function, and all types registered this way will be |
750 | global, so try to use unique names. |
1384 | global, so try to use unique names. |
751 | |
1385 | |
752 | For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>, |
1386 | For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>, |
… | |
… | |
755 | =item $handle->stop_read |
1389 | =item $handle->stop_read |
756 | |
1390 | |
757 | =item $handle->start_read |
1391 | =item $handle->start_read |
758 | |
1392 | |
759 | In rare cases you actually do not want to read anything from the |
1393 | In rare cases you actually do not want to read anything from the |
760 | socket. In this case you can call C<stop_read>. Neither C<on_read> no |
1394 | socket. In this case you can call C<stop_read>. Neither C<on_read> nor |
761 | any queued callbacks will be executed then. To start reading again, call |
1395 | any queued callbacks will be executed then. To start reading again, call |
762 | C<start_read>. |
1396 | C<start_read>. |
763 | |
1397 | |
|
|
1398 | Note that AnyEvent::Handle will automatically C<start_read> for you when |
|
|
1399 | you change the C<on_read> callback or push/unshift a read callback, and it |
|
|
1400 | will automatically C<stop_read> for you when neither C<on_read> is set nor |
|
|
1401 | there are any read requests in the queue. |
|
|
1402 | |
|
|
1403 | These methods will have no effect when in TLS mode (as TLS doesn't support |
|
|
1404 | half-duplex connections). |
|
|
1405 | |
764 | =cut |
1406 | =cut |
765 | |
1407 | |
766 | sub stop_read { |
1408 | sub stop_read { |
767 | my ($self) = @_; |
1409 | my ($self) = @_; |
768 | |
1410 | |
769 | delete $self->{rw}; |
1411 | delete $self->{_rw} unless $self->{tls}; |
770 | } |
1412 | } |
771 | |
1413 | |
772 | sub start_read { |
1414 | sub start_read { |
773 | my ($self) = @_; |
1415 | my ($self) = @_; |
774 | |
1416 | |
775 | unless ($self->{rw} || $self->{eof}) { |
1417 | unless ($self->{_rw} || $self->{_eof}) { |
776 | Scalar::Util::weaken $self; |
1418 | Scalar::Util::weaken $self; |
777 | |
1419 | |
778 | $self->{rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
1420 | $self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
779 | my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf}; |
1421 | my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf}); |
780 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
1422 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
781 | |
1423 | |
782 | if ($len > 0) { |
1424 | if ($len > 0) { |
783 | $self->{filter_r} |
1425 | $self->{_activity} = AnyEvent->now; |
784 | ? $self->{filter_r}->($self, $rbuf) |
1426 | |
785 | : $self->_drain_rbuf; |
1427 | if ($self->{tls}) { |
|
|
1428 | Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf); |
|
|
1429 | |
|
|
1430 | &_dotls ($self); |
|
|
1431 | } else { |
|
|
1432 | $self->_drain_rbuf unless $self->{_in_drain}; |
|
|
1433 | } |
786 | |
1434 | |
787 | } elsif (defined $len) { |
1435 | } elsif (defined $len) { |
788 | delete $self->{rw}; |
1436 | delete $self->{_rw}; |
789 | $self->{eof} = 1; |
1437 | $self->{_eof} = 1; |
790 | $self->_drain_rbuf; |
1438 | $self->_drain_rbuf unless $self->{_in_drain}; |
791 | |
1439 | |
792 | } elsif ($! != EAGAIN && $! != EINTR && $! != &AnyEvent::Util::WSAWOULDBLOCK) { |
1440 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
793 | return $self->error; |
1441 | return $self->_error ($!, 1); |
794 | } |
1442 | } |
795 | }); |
1443 | }); |
796 | } |
1444 | } |
797 | } |
1445 | } |
798 | |
1446 | |
|
|
1447 | our $ERROR_SYSCALL; |
|
|
1448 | our $ERROR_WANT_READ; |
|
|
1449 | |
|
|
1450 | sub _tls_error { |
|
|
1451 | my ($self, $err) = @_; |
|
|
1452 | |
|
|
1453 | return $self->_error ($!, 1) |
|
|
1454 | if $err == Net::SSLeay::ERROR_SYSCALL (); |
|
|
1455 | |
|
|
1456 | my $err =Net::SSLeay::ERR_error_string (Net::SSLeay::ERR_get_error ()); |
|
|
1457 | |
|
|
1458 | # reduce error string to look less scary |
|
|
1459 | $err =~ s/^error:[0-9a-fA-F]{8}:[^:]+:([^:]+):/\L$1: /; |
|
|
1460 | |
|
|
1461 | if ($self->{_on_starttls}) { |
|
|
1462 | (delete $self->{_on_starttls})->($self, undef, $err); |
|
|
1463 | &_freetls; |
|
|
1464 | } else { |
|
|
1465 | &_freetls; |
|
|
1466 | $self->_error (Errno::EPROTO, 1, $err); |
|
|
1467 | } |
|
|
1468 | } |
|
|
1469 | |
|
|
1470 | # poll the write BIO and send the data if applicable |
|
|
1471 | # also decode read data if possible |
|
|
1472 | # this is basiclaly our TLS state machine |
|
|
1473 | # more efficient implementations are possible with openssl, |
|
|
1474 | # but not with the buggy and incomplete Net::SSLeay. |
799 | sub _dotls { |
1475 | sub _dotls { |
800 | my ($self) = @_; |
1476 | my ($self) = @_; |
801 | |
1477 | |
|
|
1478 | my $tmp; |
|
|
1479 | |
802 | if (length $self->{tls_wbuf}) { |
1480 | if (length $self->{_tls_wbuf}) { |
803 | while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{tls_wbuf})) > 0) { |
1481 | while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) { |
804 | substr $self->{tls_wbuf}, 0, $len, ""; |
1482 | substr $self->{_tls_wbuf}, 0, $tmp, ""; |
805 | } |
1483 | } |
806 | } |
|
|
807 | |
1484 | |
|
|
1485 | $tmp = Net::SSLeay::get_error ($self->{tls}, $tmp); |
|
|
1486 | return $self->_tls_error ($tmp) |
|
|
1487 | if $tmp != $ERROR_WANT_READ |
|
|
1488 | && ($tmp != $ERROR_SYSCALL || $!); |
|
|
1489 | } |
|
|
1490 | |
808 | if (defined (my $buf = Net::SSLeay::BIO_read ($self->{tls_wbio}))) { |
1491 | while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) { |
|
|
1492 | unless (length $tmp) { |
|
|
1493 | $self->{_on_starttls} |
|
|
1494 | and (delete $self->{_on_starttls})->($self, undef, "EOF during handshake"); # ??? |
|
|
1495 | &_freetls; |
|
|
1496 | |
|
|
1497 | if ($self->{on_stoptls}) { |
|
|
1498 | $self->{on_stoptls}($self); |
|
|
1499 | return; |
|
|
1500 | } else { |
|
|
1501 | # let's treat SSL-eof as we treat normal EOF |
|
|
1502 | delete $self->{_rw}; |
|
|
1503 | $self->{_eof} = 1; |
|
|
1504 | } |
|
|
1505 | } |
|
|
1506 | |
|
|
1507 | $self->{_tls_rbuf} .= $tmp; |
|
|
1508 | $self->_drain_rbuf unless $self->{_in_drain}; |
|
|
1509 | $self->{tls} or return; # tls session might have gone away in callback |
|
|
1510 | } |
|
|
1511 | |
|
|
1512 | $tmp = Net::SSLeay::get_error ($self->{tls}, -1); |
|
|
1513 | return $self->_tls_error ($tmp) |
|
|
1514 | if $tmp != $ERROR_WANT_READ |
|
|
1515 | && ($tmp != $ERROR_SYSCALL || $!); |
|
|
1516 | |
|
|
1517 | while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
809 | $self->{wbuf} .= $buf; |
1518 | $self->{wbuf} .= $tmp; |
810 | $self->_drain_wbuf; |
1519 | $self->_drain_wbuf; |
811 | } |
1520 | } |
812 | |
1521 | |
813 | while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) { |
1522 | $self->{_on_starttls} |
814 | $self->{rbuf} .= $buf; |
1523 | and Net::SSLeay::state ($self->{tls}) == Net::SSLeay::ST_OK () |
815 | $self->_drain_rbuf; |
1524 | and (delete $self->{_on_starttls})->($self, 1, "TLS/SSL connection established"); |
816 | } |
|
|
817 | |
|
|
818 | my $err = Net::SSLeay::get_error ($self->{tls}, -1); |
|
|
819 | |
|
|
820 | if ($err!= Net::SSLeay::ERROR_WANT_READ ()) { |
|
|
821 | if ($err == Net::SSLeay::ERROR_SYSCALL ()) { |
|
|
822 | $self->error; |
|
|
823 | } elsif ($err == Net::SSLeay::ERROR_SSL ()) { |
|
|
824 | $! = &Errno::EIO; |
|
|
825 | $self->error; |
|
|
826 | } |
|
|
827 | |
|
|
828 | # all others are fine for our purposes |
|
|
829 | } |
|
|
830 | } |
1525 | } |
831 | |
1526 | |
832 | =item $handle->starttls ($tls[, $tls_ctx]) |
1527 | =item $handle->starttls ($tls[, $tls_ctx]) |
833 | |
1528 | |
834 | Instead of starting TLS negotiation immediately when the AnyEvent::Handle |
1529 | Instead of starting TLS negotiation immediately when the AnyEvent::Handle |
835 | object is created, you can also do that at a later time by calling |
1530 | object is created, you can also do that at a later time by calling |
836 | C<starttls>. |
1531 | C<starttls>. |
837 | |
1532 | |
|
|
1533 | Starting TLS is currently an asynchronous operation - when you push some |
|
|
1534 | write data and then call C<< ->starttls >> then TLS negotiation will start |
|
|
1535 | immediately, after which the queued write data is then sent. |
|
|
1536 | |
838 | The first argument is the same as the C<tls> constructor argument (either |
1537 | The first argument is the same as the C<tls> constructor argument (either |
839 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
1538 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
840 | |
1539 | |
841 | The second argument is the optional C<Net::SSLeay::CTX> object that is |
1540 | The second argument is the optional C<AnyEvent::TLS> object that is used |
842 | used when AnyEvent::Handle has to create its own TLS connection object. |
1541 | when AnyEvent::Handle has to create its own TLS connection object, or |
|
|
1542 | a hash reference with C<< key => value >> pairs that will be used to |
|
|
1543 | construct a new context. |
843 | |
1544 | |
844 | =cut |
1545 | The TLS connection object will end up in C<< $handle->{tls} >>, the TLS |
|
|
1546 | context in C<< $handle->{tls_ctx} >> after this call and can be used or |
|
|
1547 | changed to your liking. Note that the handshake might have already started |
|
|
1548 | when this function returns. |
845 | |
1549 | |
846 | # TODO: maybe document... |
1550 | If it an error to start a TLS handshake more than once per |
|
|
1551 | AnyEvent::Handle object (this is due to bugs in OpenSSL). |
|
|
1552 | |
|
|
1553 | =cut |
|
|
1554 | |
|
|
1555 | our %TLS_CACHE; #TODO not yet documented, should we? |
|
|
1556 | |
847 | sub starttls { |
1557 | sub starttls { |
848 | my ($self, $ssl, $ctx) = @_; |
1558 | my ($self, $ssl, $ctx) = @_; |
849 | |
1559 | |
850 | $self->stoptls; |
1560 | require Net::SSLeay; |
851 | |
1561 | |
852 | if ($ssl eq "accept") { |
1562 | Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object" |
853 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
1563 | if $self->{tls}; |
854 | Net::SSLeay::set_accept_state ($ssl); |
1564 | |
855 | } elsif ($ssl eq "connect") { |
1565 | $ERROR_SYSCALL = Net::SSLeay::ERROR_SYSCALL (); |
856 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
1566 | $ERROR_WANT_READ = Net::SSLeay::ERROR_WANT_READ (); |
857 | Net::SSLeay::set_connect_state ($ssl); |
1567 | |
|
|
1568 | $ctx ||= $self->{tls_ctx}; |
|
|
1569 | |
|
|
1570 | local $Carp::CarpLevel = 1; # skip ourselves when creating a new context or session |
|
|
1571 | |
|
|
1572 | if ("HASH" eq ref $ctx) { |
|
|
1573 | require AnyEvent::TLS; |
|
|
1574 | |
|
|
1575 | if ($ctx->{cache}) { |
|
|
1576 | my $key = $ctx+0; |
|
|
1577 | $ctx = $TLS_CACHE{$key} ||= new AnyEvent::TLS %$ctx; |
|
|
1578 | } else { |
|
|
1579 | $ctx = new AnyEvent::TLS %$ctx; |
|
|
1580 | } |
|
|
1581 | } |
858 | } |
1582 | |
859 | |
1583 | $self->{tls_ctx} = $ctx || TLS_CTX (); |
860 | $self->{tls} = $ssl; |
1584 | $self->{tls} = $ssl = $self->{tls_ctx}->_get_session ($ssl, $self, $self->{peername}); |
861 | |
1585 | |
862 | # basically, this is deep magic (because SSL_read should have the same issues) |
1586 | # basically, this is deep magic (because SSL_read should have the same issues) |
863 | # but the openssl maintainers basically said: "trust us, it just works". |
1587 | # but the openssl maintainers basically said: "trust us, it just works". |
864 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
1588 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
865 | # and mismaintained ssleay-module doesn't even offer them). |
1589 | # and mismaintained ssleay-module doesn't even offer them). |
866 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
1590 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
|
|
1591 | # |
|
|
1592 | # in short: this is a mess. |
|
|
1593 | # |
|
|
1594 | # note that we do not try to keep the length constant between writes as we are required to do. |
|
|
1595 | # we assume that most (but not all) of this insanity only applies to non-blocking cases, |
|
|
1596 | # and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to |
|
|
1597 | # have identity issues in that area. |
867 | Net::SSLeay::CTX_set_mode ($self->{tls}, |
1598 | # Net::SSLeay::CTX_set_mode ($ssl, |
868 | (eval { Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
1599 | # (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
869 | | (eval { Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
1600 | # | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
|
|
1601 | Net::SSLeay::CTX_set_mode ($ssl, 1|2); |
870 | |
1602 | |
871 | $self->{tls_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1603 | $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
872 | $self->{tls_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
1604 | $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
873 | |
1605 | |
874 | Net::SSLeay::set_bio ($ssl, $self->{tls_rbio}, $self->{tls_wbio}); |
1606 | Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio}); |
875 | |
1607 | |
876 | $self->{filter_w} = sub { |
1608 | $self->{_on_starttls} = sub { $_[0]{on_starttls}(@_) } |
877 | $_[0]{tls_wbuf} .= ${$_[1]}; |
1609 | if $self->{on_starttls}; |
878 | &_dotls; |
1610 | |
879 | }; |
1611 | &_dotls; # need to trigger the initial handshake |
880 | $self->{filter_r} = sub { |
1612 | $self->start_read; # make sure we actually do read |
881 | Net::SSLeay::BIO_write ($_[0]{tls_rbio}, ${$_[1]}); |
|
|
882 | &_dotls; |
|
|
883 | }; |
|
|
884 | } |
1613 | } |
885 | |
1614 | |
886 | =item $handle->stoptls |
1615 | =item $handle->stoptls |
887 | |
1616 | |
888 | Destroys the SSL connection, if any. Partial read or write data will be |
1617 | Shuts down the SSL connection - this makes a proper EOF handshake by |
889 | lost. |
1618 | sending a close notify to the other side, but since OpenSSL doesn't |
|
|
1619 | support non-blocking shut downs, it is not possible to re-use the stream |
|
|
1620 | afterwards. |
890 | |
1621 | |
891 | =cut |
1622 | =cut |
892 | |
1623 | |
893 | sub stoptls { |
1624 | sub stoptls { |
894 | my ($self) = @_; |
1625 | my ($self) = @_; |
895 | |
1626 | |
896 | Net::SSLeay::free (delete $self->{tls}) if $self->{tls}; |
1627 | if ($self->{tls}) { |
897 | delete $self->{tls_rbio}; |
1628 | Net::SSLeay::shutdown ($self->{tls}); |
898 | delete $self->{tls_wbio}; |
1629 | |
899 | delete $self->{tls_wbuf}; |
1630 | &_dotls; |
900 | delete $self->{filter_r}; |
1631 | |
901 | delete $self->{filter_w}; |
1632 | # # we don't give a shit. no, we do, but we can't. no...#d# |
|
|
1633 | # # we, we... have to use openssl :/#d# |
|
|
1634 | # &_freetls;#d# |
|
|
1635 | } |
|
|
1636 | } |
|
|
1637 | |
|
|
1638 | sub _freetls { |
|
|
1639 | my ($self) = @_; |
|
|
1640 | |
|
|
1641 | return unless $self->{tls}; |
|
|
1642 | |
|
|
1643 | $self->{tls_ctx}->_put_session (delete $self->{tls}); |
|
|
1644 | |
|
|
1645 | delete @$self{qw(_rbio _wbio _tls_wbuf _on_starttls)}; |
902 | } |
1646 | } |
903 | |
1647 | |
904 | sub DESTROY { |
1648 | sub DESTROY { |
905 | my $self = shift; |
1649 | my ($self) = @_; |
906 | |
1650 | |
907 | $self->stoptls; |
1651 | &_freetls; |
|
|
1652 | |
|
|
1653 | my $linger = exists $self->{linger} ? $self->{linger} : 3600; |
|
|
1654 | |
|
|
1655 | if ($linger && length $self->{wbuf} && $self->{fh}) { |
|
|
1656 | my $fh = delete $self->{fh}; |
|
|
1657 | my $wbuf = delete $self->{wbuf}; |
|
|
1658 | |
|
|
1659 | my @linger; |
|
|
1660 | |
|
|
1661 | push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub { |
|
|
1662 | my $len = syswrite $fh, $wbuf, length $wbuf; |
|
|
1663 | |
|
|
1664 | if ($len > 0) { |
|
|
1665 | substr $wbuf, 0, $len, ""; |
|
|
1666 | } else { |
|
|
1667 | @linger = (); # end |
|
|
1668 | } |
|
|
1669 | }); |
|
|
1670 | push @linger, AnyEvent->timer (after => $linger, cb => sub { |
|
|
1671 | @linger = (); |
|
|
1672 | }); |
|
|
1673 | } |
|
|
1674 | } |
|
|
1675 | |
|
|
1676 | =item $handle->destroy |
|
|
1677 | |
|
|
1678 | Shuts down the handle object as much as possible - this call ensures that |
|
|
1679 | no further callbacks will be invoked and as many resources as possible |
|
|
1680 | will be freed. You must not call any methods on the object afterwards. |
|
|
1681 | |
|
|
1682 | Normally, you can just "forget" any references to an AnyEvent::Handle |
|
|
1683 | object and it will simply shut down. This works in fatal error and EOF |
|
|
1684 | callbacks, as well as code outside. It does I<NOT> work in a read or write |
|
|
1685 | callback, so when you want to destroy the AnyEvent::Handle object from |
|
|
1686 | within such an callback. You I<MUST> call C<< ->destroy >> explicitly in |
|
|
1687 | that case. |
|
|
1688 | |
|
|
1689 | Destroying the handle object in this way has the advantage that callbacks |
|
|
1690 | will be removed as well, so if those are the only reference holders (as |
|
|
1691 | is common), then one doesn't need to do anything special to break any |
|
|
1692 | reference cycles. |
|
|
1693 | |
|
|
1694 | The handle might still linger in the background and write out remaining |
|
|
1695 | data, as specified by the C<linger> option, however. |
|
|
1696 | |
|
|
1697 | =cut |
|
|
1698 | |
|
|
1699 | sub destroy { |
|
|
1700 | my ($self) = @_; |
|
|
1701 | |
|
|
1702 | $self->DESTROY; |
|
|
1703 | %$self = (); |
908 | } |
1704 | } |
909 | |
1705 | |
910 | =item AnyEvent::Handle::TLS_CTX |
1706 | =item AnyEvent::Handle::TLS_CTX |
911 | |
1707 | |
912 | This function creates and returns the Net::SSLeay::CTX object used by |
1708 | This function creates and returns the AnyEvent::TLS object used by default |
913 | default for TLS mode. |
1709 | for TLS mode. |
914 | |
1710 | |
915 | The context is created like this: |
1711 | The context is created by calling L<AnyEvent::TLS> without any arguments. |
916 | |
|
|
917 | Net::SSLeay::load_error_strings; |
|
|
918 | Net::SSLeay::SSLeay_add_ssl_algorithms; |
|
|
919 | Net::SSLeay::randomize; |
|
|
920 | |
|
|
921 | my $CTX = Net::SSLeay::CTX_new; |
|
|
922 | |
|
|
923 | Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL |
|
|
924 | |
1712 | |
925 | =cut |
1713 | =cut |
926 | |
1714 | |
927 | our $TLS_CTX; |
1715 | our $TLS_CTX; |
928 | |
1716 | |
929 | sub TLS_CTX() { |
1717 | sub TLS_CTX() { |
930 | $TLS_CTX || do { |
1718 | $TLS_CTX ||= do { |
931 | require Net::SSLeay; |
1719 | require AnyEvent::TLS; |
932 | |
1720 | |
933 | Net::SSLeay::load_error_strings (); |
1721 | new AnyEvent::TLS |
934 | Net::SSLeay::SSLeay_add_ssl_algorithms (); |
|
|
935 | Net::SSLeay::randomize (); |
|
|
936 | |
|
|
937 | $TLS_CTX = Net::SSLeay::CTX_new (); |
|
|
938 | |
|
|
939 | Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ()); |
|
|
940 | |
|
|
941 | $TLS_CTX |
|
|
942 | } |
1722 | } |
943 | } |
1723 | } |
944 | |
1724 | |
945 | =back |
1725 | =back |
946 | |
1726 | |
|
|
1727 | |
|
|
1728 | =head1 NONFREQUENTLY ASKED QUESTIONS |
|
|
1729 | |
|
|
1730 | =over 4 |
|
|
1731 | |
|
|
1732 | =item I C<undef> the AnyEvent::Handle reference inside my callback and |
|
|
1733 | still get further invocations! |
|
|
1734 | |
|
|
1735 | That's because AnyEvent::Handle keeps a reference to itself when handling |
|
|
1736 | read or write callbacks. |
|
|
1737 | |
|
|
1738 | It is only safe to "forget" the reference inside EOF or error callbacks, |
|
|
1739 | from within all other callbacks, you need to explicitly call the C<< |
|
|
1740 | ->destroy >> method. |
|
|
1741 | |
|
|
1742 | =item I get different callback invocations in TLS mode/Why can't I pause |
|
|
1743 | reading? |
|
|
1744 | |
|
|
1745 | Unlike, say, TCP, TLS connections do not consist of two independent |
|
|
1746 | communication channels, one for each direction. Or put differently. The |
|
|
1747 | read and write directions are not independent of each other: you cannot |
|
|
1748 | write data unless you are also prepared to read, and vice versa. |
|
|
1749 | |
|
|
1750 | This can mean than, in TLS mode, you might get C<on_error> or C<on_eof> |
|
|
1751 | callback invocations when you are not expecting any read data - the reason |
|
|
1752 | is that AnyEvent::Handle always reads in TLS mode. |
|
|
1753 | |
|
|
1754 | During the connection, you have to make sure that you always have a |
|
|
1755 | non-empty read-queue, or an C<on_read> watcher. At the end of the |
|
|
1756 | connection (or when you no longer want to use it) you can call the |
|
|
1757 | C<destroy> method. |
|
|
1758 | |
|
|
1759 | =item How do I read data until the other side closes the connection? |
|
|
1760 | |
|
|
1761 | If you just want to read your data into a perl scalar, the easiest way |
|
|
1762 | to achieve this is by setting an C<on_read> callback that does nothing, |
|
|
1763 | clearing the C<on_eof> callback and in the C<on_error> callback, the data |
|
|
1764 | will be in C<$_[0]{rbuf}>: |
|
|
1765 | |
|
|
1766 | $handle->on_read (sub { }); |
|
|
1767 | $handle->on_eof (undef); |
|
|
1768 | $handle->on_error (sub { |
|
|
1769 | my $data = delete $_[0]{rbuf}; |
|
|
1770 | }); |
|
|
1771 | |
|
|
1772 | The reason to use C<on_error> is that TCP connections, due to latencies |
|
|
1773 | and packets loss, might get closed quite violently with an error, when in |
|
|
1774 | fact, all data has been received. |
|
|
1775 | |
|
|
1776 | It is usually better to use acknowledgements when transferring data, |
|
|
1777 | to make sure the other side hasn't just died and you got the data |
|
|
1778 | intact. This is also one reason why so many internet protocols have an |
|
|
1779 | explicit QUIT command. |
|
|
1780 | |
|
|
1781 | =item I don't want to destroy the handle too early - how do I wait until |
|
|
1782 | all data has been written? |
|
|
1783 | |
|
|
1784 | After writing your last bits of data, set the C<on_drain> callback |
|
|
1785 | and destroy the handle in there - with the default setting of |
|
|
1786 | C<low_water_mark> this will be called precisely when all data has been |
|
|
1787 | written to the socket: |
|
|
1788 | |
|
|
1789 | $handle->push_write (...); |
|
|
1790 | $handle->on_drain (sub { |
|
|
1791 | warn "all data submitted to the kernel\n"; |
|
|
1792 | undef $handle; |
|
|
1793 | }); |
|
|
1794 | |
|
|
1795 | If you just want to queue some data and then signal EOF to the other side, |
|
|
1796 | consider using C<< ->push_shutdown >> instead. |
|
|
1797 | |
|
|
1798 | =item I want to contact a TLS/SSL server, I don't care about security. |
|
|
1799 | |
|
|
1800 | If your TLS server is a pure TLS server (e.g. HTTPS) that only speaks TLS, |
|
|
1801 | simply connect to it and then create the AnyEvent::Handle with the C<tls> |
|
|
1802 | parameter: |
|
|
1803 | |
|
|
1804 | tcp_connect $host, $port, sub { |
|
|
1805 | my ($fh) = @_; |
|
|
1806 | |
|
|
1807 | my $handle = new AnyEvent::Handle |
|
|
1808 | fh => $fh, |
|
|
1809 | tls => "connect", |
|
|
1810 | on_error => sub { ... }; |
|
|
1811 | |
|
|
1812 | $handle->push_write (...); |
|
|
1813 | }; |
|
|
1814 | |
|
|
1815 | =item I want to contact a TLS/SSL server, I do care about security. |
|
|
1816 | |
|
|
1817 | Then you should additionally enable certificate verification, including |
|
|
1818 | peername verification, if the protocol you use supports it (see |
|
|
1819 | L<AnyEvent::TLS>, C<verify_peername>). |
|
|
1820 | |
|
|
1821 | E.g. for HTTPS: |
|
|
1822 | |
|
|
1823 | tcp_connect $host, $port, sub { |
|
|
1824 | my ($fh) = @_; |
|
|
1825 | |
|
|
1826 | my $handle = new AnyEvent::Handle |
|
|
1827 | fh => $fh, |
|
|
1828 | peername => $host, |
|
|
1829 | tls => "connect", |
|
|
1830 | tls_ctx => { verify => 1, verify_peername => "https" }, |
|
|
1831 | ... |
|
|
1832 | |
|
|
1833 | Note that you must specify the hostname you connected to (or whatever |
|
|
1834 | "peername" the protocol needs) as the C<peername> argument, otherwise no |
|
|
1835 | peername verification will be done. |
|
|
1836 | |
|
|
1837 | The above will use the system-dependent default set of trusted CA |
|
|
1838 | certificates. If you want to check against a specific CA, add the |
|
|
1839 | C<ca_file> (or C<ca_cert>) arguments to C<tls_ctx>: |
|
|
1840 | |
|
|
1841 | tls_ctx => { |
|
|
1842 | verify => 1, |
|
|
1843 | verify_peername => "https", |
|
|
1844 | ca_file => "my-ca-cert.pem", |
|
|
1845 | }, |
|
|
1846 | |
|
|
1847 | =item I want to create a TLS/SSL server, how do I do that? |
|
|
1848 | |
|
|
1849 | Well, you first need to get a server certificate and key. You have |
|
|
1850 | three options: a) ask a CA (buy one, use cacert.org etc.) b) create a |
|
|
1851 | self-signed certificate (cheap. check the search engine of your choice, |
|
|
1852 | there are many tutorials on the net) or c) make your own CA (tinyca2 is a |
|
|
1853 | nice program for that purpose). |
|
|
1854 | |
|
|
1855 | Then create a file with your private key (in PEM format, see |
|
|
1856 | L<AnyEvent::TLS>), followed by the certificate (also in PEM format). The |
|
|
1857 | file should then look like this: |
|
|
1858 | |
|
|
1859 | -----BEGIN RSA PRIVATE KEY----- |
|
|
1860 | ...header data |
|
|
1861 | ... lots of base64'y-stuff |
|
|
1862 | -----END RSA PRIVATE KEY----- |
|
|
1863 | |
|
|
1864 | -----BEGIN CERTIFICATE----- |
|
|
1865 | ... lots of base64'y-stuff |
|
|
1866 | -----END CERTIFICATE----- |
|
|
1867 | |
|
|
1868 | The important bits are the "PRIVATE KEY" and "CERTIFICATE" parts. Then |
|
|
1869 | specify this file as C<cert_file>: |
|
|
1870 | |
|
|
1871 | tcp_server undef, $port, sub { |
|
|
1872 | my ($fh) = @_; |
|
|
1873 | |
|
|
1874 | my $handle = new AnyEvent::Handle |
|
|
1875 | fh => $fh, |
|
|
1876 | tls => "accept", |
|
|
1877 | tls_ctx => { cert_file => "my-server-keycert.pem" }, |
|
|
1878 | ... |
|
|
1879 | |
|
|
1880 | When you have intermediate CA certificates that your clients might not |
|
|
1881 | know about, just append them to the C<cert_file>. |
|
|
1882 | |
|
|
1883 | =back |
|
|
1884 | |
|
|
1885 | |
|
|
1886 | =head1 SUBCLASSING AnyEvent::Handle |
|
|
1887 | |
|
|
1888 | In many cases, you might want to subclass AnyEvent::Handle. |
|
|
1889 | |
|
|
1890 | To make this easier, a given version of AnyEvent::Handle uses these |
|
|
1891 | conventions: |
|
|
1892 | |
|
|
1893 | =over 4 |
|
|
1894 | |
|
|
1895 | =item * all constructor arguments become object members. |
|
|
1896 | |
|
|
1897 | At least initially, when you pass a C<tls>-argument to the constructor it |
|
|
1898 | will end up in C<< $handle->{tls} >>. Those members might be changed or |
|
|
1899 | mutated later on (for example C<tls> will hold the TLS connection object). |
|
|
1900 | |
|
|
1901 | =item * other object member names are prefixed with an C<_>. |
|
|
1902 | |
|
|
1903 | All object members not explicitly documented (internal use) are prefixed |
|
|
1904 | with an underscore character, so the remaining non-C<_>-namespace is free |
|
|
1905 | for use for subclasses. |
|
|
1906 | |
|
|
1907 | =item * all members not documented here and not prefixed with an underscore |
|
|
1908 | are free to use in subclasses. |
|
|
1909 | |
|
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1910 | Of course, new versions of AnyEvent::Handle may introduce more "public" |
|
|
1911 | member variables, but thats just life, at least it is documented. |
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|
1912 | |
|
|
1913 | =back |
|
|
1914 | |
947 | =head1 AUTHOR |
1915 | =head1 AUTHOR |
948 | |
1916 | |
949 | Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>. |
1917 | Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>. |
950 | |
1918 | |
951 | =cut |
1919 | =cut |