1 | package AnyEvent::Handle; |
1 | package AnyEvent::Handle; |
2 | |
2 | |
3 | use warnings; |
3 | no warnings; |
4 | use strict; |
4 | use strict qw(subs vars); |
5 | |
5 | |
6 | use AnyEvent; |
6 | use AnyEvent (); |
7 | use IO::Handle; |
7 | use AnyEvent::Util qw(WSAEWOULDBLOCK); |
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8 | use Scalar::Util (); |
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9 | use Carp (); |
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10 | use Fcntl (); |
8 | use Errno qw/EAGAIN EINTR/; |
11 | use Errno qw(EAGAIN EINTR); |
9 | |
12 | |
10 | =head1 NAME |
13 | =head1 NAME |
11 | |
14 | |
12 | AnyEvent::Handle - non-blocking I/O on filehandles via AnyEvent |
15 | AnyEvent::Handle - non-blocking I/O on file handles via AnyEvent |
13 | |
16 | |
14 | =head1 VERSION |
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15 | |
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16 | Version 0.01 |
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17 | |
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18 | =cut |
17 | =cut |
19 | |
18 | |
20 | our $VERSION = '0.01'; |
19 | our $VERSION = 4.45; |
21 | |
20 | |
22 | =head1 SYNOPSIS |
21 | =head1 SYNOPSIS |
23 | |
22 | |
24 | use AnyEvent; |
23 | use AnyEvent; |
25 | use AnyEvent::Handle; |
24 | use AnyEvent::Handle; |
26 | |
25 | |
27 | my $cv = AnyEvent->condvar; |
26 | my $cv = AnyEvent->condvar; |
28 | |
27 | |
29 | my $ae_fh = AnyEvent::Handle->new (fh => \*STDIN); |
28 | my $handle = |
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29 | AnyEvent::Handle->new ( |
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30 | fh => \*STDIN, |
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31 | on_eof => sub { |
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32 | $cv->send; |
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33 | }, |
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34 | ); |
30 | |
35 | |
31 | $ae_fh->readlines (sub { |
36 | # send some request line |
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37 | $handle->push_write ("getinfo\015\012"); |
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38 | |
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39 | # read the response line |
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40 | $handle->push_read (line => sub { |
32 | my ($ae_fh, @lines) = @_; |
41 | my ($handle, $line) = @_; |
33 | for (@lines) { |
42 | warn "read line <$line>\n"; |
34 | chomp; |
43 | $cv->send; |
35 | print "Line: $_"; |
44 | }); |
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45 | |
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46 | $cv->recv; |
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47 | |
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48 | =head1 DESCRIPTION |
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49 | |
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50 | This module is a helper module to make it easier to do event-based I/O on |
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51 | filehandles. For utility functions for doing non-blocking connects and accepts |
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52 | on sockets see L<AnyEvent::Util>. |
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53 | |
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54 | The L<AnyEvent::Intro> tutorial contains some well-documented |
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55 | AnyEvent::Handle examples. |
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56 | |
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57 | In the following, when the documentation refers to of "bytes" then this |
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58 | means characters. As sysread and syswrite are used for all I/O, their |
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59 | treatment of characters applies to this module as well. |
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60 | |
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61 | All callbacks will be invoked with the handle object as their first |
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62 | argument. |
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63 | |
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64 | =head1 METHODS |
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65 | |
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66 | =over 4 |
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67 | |
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68 | =item $handle = B<new> AnyEvent::TLS fh => $filehandle, key => value... |
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69 | |
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70 | The constructor supports these arguments (all as C<< key => value >> pairs). |
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71 | |
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72 | =over 4 |
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73 | |
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74 | =item fh => $filehandle [MANDATORY] |
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75 | |
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76 | The filehandle this L<AnyEvent::Handle> object will operate on. |
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77 | |
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78 | NOTE: The filehandle will be set to non-blocking mode (using |
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79 | C<AnyEvent::Util::fh_nonblocking>) by the constructor and needs to stay in |
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80 | that mode. |
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81 | |
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82 | =item on_eof => $cb->($handle) |
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83 | |
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84 | Set the callback to be called when an end-of-file condition is detected, |
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85 | i.e. in the case of a socket, when the other side has closed the |
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86 | connection cleanly. |
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87 | |
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88 | For sockets, this just means that the other side has stopped sending data, |
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89 | you can still try to write data, and, in fact, one can return from the EOF |
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90 | callback and continue writing data, as only the read part has been shut |
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91 | down. |
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92 | |
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93 | While not mandatory, it is I<highly> recommended to set an EOF callback, |
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94 | otherwise you might end up with a closed socket while you are still |
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95 | waiting for data. |
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96 | |
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97 | If an EOF condition has been detected but no C<on_eof> callback has been |
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98 | set, then a fatal error will be raised with C<$!> set to <0>. |
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99 | |
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100 | =item on_error => $cb->($handle, $fatal) |
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101 | |
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102 | This is the error callback, which is called when, well, some error |
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103 | occured, such as not being able to resolve the hostname, failure to |
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104 | connect or a read error. |
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105 | |
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106 | Some errors are fatal (which is indicated by C<$fatal> being true). On |
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107 | fatal errors the handle object will be shut down and will not be usable |
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108 | (but you are free to look at the current C<< ->rbuf >>). Examples of fatal |
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109 | errors are an EOF condition with active (but unsatisifable) read watchers |
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110 | (C<EPIPE>) or I/O errors. |
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111 | |
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112 | Non-fatal errors can be retried by simply returning, but it is recommended |
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113 | to simply ignore this parameter and instead abondon the handle object |
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114 | when this callback is invoked. Examples of non-fatal errors are timeouts |
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115 | C<ETIMEDOUT>) or badly-formatted data (C<EBADMSG>). |
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116 | |
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117 | On callback entrance, the value of C<$!> contains the operating system |
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118 | error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>). |
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119 | |
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120 | While not mandatory, it is I<highly> recommended to set this callback, as |
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121 | you will not be notified of errors otherwise. The default simply calls |
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122 | C<croak>. |
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123 | |
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124 | =item on_read => $cb->($handle) |
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125 | |
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126 | This sets the default read callback, which is called when data arrives |
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127 | and no read request is in the queue (unlike read queue callbacks, this |
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128 | callback will only be called when at least one octet of data is in the |
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129 | read buffer). |
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130 | |
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131 | To access (and remove data from) the read buffer, use the C<< ->rbuf >> |
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132 | method or access the C<$handle->{rbuf}> member directly. Note that you |
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133 | must not enlarge or modify the read buffer, you can only remove data at |
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134 | the beginning from it. |
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135 | |
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136 | When an EOF condition is detected then AnyEvent::Handle will first try to |
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137 | feed all the remaining data to the queued callbacks and C<on_read> before |
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138 | calling the C<on_eof> callback. If no progress can be made, then a fatal |
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139 | error will be raised (with C<$!> set to C<EPIPE>). |
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140 | |
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141 | =item on_drain => $cb->($handle) |
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142 | |
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143 | This sets the callback that is called when the write buffer becomes empty |
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144 | (or when the callback is set and the buffer is empty already). |
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145 | |
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146 | To append to the write buffer, use the C<< ->push_write >> method. |
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147 | |
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148 | This callback is useful when you don't want to put all of your write data |
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149 | into the queue at once, for example, when you want to write the contents |
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150 | of some file to the socket you might not want to read the whole file into |
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151 | memory and push it into the queue, but instead only read more data from |
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152 | the file when the write queue becomes empty. |
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153 | |
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154 | =item timeout => $fractional_seconds |
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155 | |
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156 | If non-zero, then this enables an "inactivity" timeout: whenever this many |
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157 | seconds pass without a successful read or write on the underlying file |
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158 | handle, the C<on_timeout> callback will be invoked (and if that one is |
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159 | missing, a non-fatal C<ETIMEDOUT> error will be raised). |
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160 | |
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161 | Note that timeout processing is also active when you currently do not have |
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162 | any outstanding read or write requests: If you plan to keep the connection |
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163 | idle then you should disable the timout temporarily or ignore the timeout |
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164 | in the C<on_timeout> callback, in which case AnyEvent::Handle will simply |
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165 | restart the timeout. |
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166 | |
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167 | Zero (the default) disables this timeout. |
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168 | |
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169 | =item on_timeout => $cb->($handle) |
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170 | |
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171 | Called whenever the inactivity timeout passes. If you return from this |
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172 | callback, then the timeout will be reset as if some activity had happened, |
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173 | so this condition is not fatal in any way. |
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174 | |
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175 | =item rbuf_max => <bytes> |
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176 | |
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177 | If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
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178 | when the read buffer ever (strictly) exceeds this size. This is useful to |
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179 | avoid some forms of denial-of-service attacks. |
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180 | |
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181 | For example, a server accepting connections from untrusted sources should |
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182 | be configured to accept only so-and-so much data that it cannot act on |
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183 | (for example, when expecting a line, an attacker could send an unlimited |
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184 | amount of data without a callback ever being called as long as the line |
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185 | isn't finished). |
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186 | |
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187 | =item autocork => <boolean> |
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188 | |
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189 | When disabled (the default), then C<push_write> will try to immediately |
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190 | write the data to the handle, if possible. This avoids having to register |
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191 | a write watcher and wait for the next event loop iteration, but can |
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192 | be inefficient if you write multiple small chunks (on the wire, this |
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193 | disadvantage is usually avoided by your kernel's nagle algorithm, see |
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194 | C<no_delay>, but this option can save costly syscalls). |
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195 | |
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196 | When enabled, then writes will always be queued till the next event loop |
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197 | iteration. This is efficient when you do many small writes per iteration, |
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198 | but less efficient when you do a single write only per iteration (or when |
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199 | the write buffer often is full). It also increases write latency. |
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200 | |
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201 | =item no_delay => <boolean> |
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202 | |
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203 | When doing small writes on sockets, your operating system kernel might |
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204 | wait a bit for more data before actually sending it out. This is called |
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205 | the Nagle algorithm, and usually it is beneficial. |
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206 | |
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207 | In some situations you want as low a delay as possible, which can be |
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208 | accomplishd by setting this option to a true value. |
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209 | |
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210 | The default is your opertaing system's default behaviour (most likely |
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211 | enabled), this option explicitly enables or disables it, if possible. |
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212 | |
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213 | =item read_size => <bytes> |
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214 | |
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215 | The default read block size (the amount of bytes this module will |
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216 | try to read during each loop iteration, which affects memory |
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217 | requirements). Default: C<8192>. |
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218 | |
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219 | =item low_water_mark => <bytes> |
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220 | |
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221 | Sets the amount of bytes (default: C<0>) that make up an "empty" write |
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222 | buffer: If the write reaches this size or gets even samller it is |
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223 | considered empty. |
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224 | |
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225 | Sometimes it can be beneficial (for performance reasons) to add data to |
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226 | the write buffer before it is fully drained, but this is a rare case, as |
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227 | the operating system kernel usually buffers data as well, so the default |
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228 | is good in almost all cases. |
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229 | |
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230 | =item linger => <seconds> |
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231 | |
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232 | If non-zero (default: C<3600>), then the destructor of the |
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233 | AnyEvent::Handle object will check whether there is still outstanding |
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234 | write data and will install a watcher that will write this data to the |
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235 | socket. No errors will be reported (this mostly matches how the operating |
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236 | system treats outstanding data at socket close time). |
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237 | |
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238 | This will not work for partial TLS data that could not be encoded |
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239 | yet. This data will be lost. Calling the C<stoptls> method in time might |
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240 | help. |
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241 | |
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242 | =item common_name => $string |
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243 | |
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244 | The common name used by some verification methods (most notably SSL/TLS) |
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245 | associated with this connection. Usually this is the remote hostname used |
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246 | to connect, but can be almost anything. |
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247 | |
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248 | =item tls => "accept" | "connect" | Net::SSLeay::SSL object |
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249 | |
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250 | When this parameter is given, it enables TLS (SSL) mode, that means |
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251 | AnyEvent will start a TLS handshake as soon as the conenction has been |
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252 | established and will transparently encrypt/decrypt data afterwards. |
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253 | |
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254 | TLS mode requires Net::SSLeay to be installed (it will be loaded |
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255 | automatically when you try to create a TLS handle): this module doesn't |
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256 | have a dependency on that module, so if your module requires it, you have |
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257 | to add the dependency yourself. |
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258 | |
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259 | Unlike TCP, TLS has a server and client side: for the TLS server side, use |
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260 | C<accept>, and for the TLS client side of a connection, use C<connect> |
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261 | mode. |
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262 | |
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263 | You can also provide your own TLS connection object, but you have |
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264 | to make sure that you call either C<Net::SSLeay::set_connect_state> |
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265 | or C<Net::SSLeay::set_accept_state> on it before you pass it to |
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266 | AnyEvent::Handle. Also, this module will take ownership of this connection |
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267 | object. |
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268 | |
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269 | At some future point, AnyEvent::Handle might switch to another TLS |
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270 | implementation, then the option to use your own session object will go |
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271 | away. |
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272 | |
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273 | B<IMPORTANT:> since Net::SSLeay "objects" are really only integers, |
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274 | passing in the wrong integer will lead to certain crash. This most often |
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275 | happens when one uses a stylish C<< tls => 1 >> and is surprised about the |
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276 | segmentation fault. |
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277 | |
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278 | See the C<< ->starttls >> method for when need to start TLS negotiation later. |
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279 | |
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280 | =item tls_ctx => $anyevent_tls |
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281 | |
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282 | Use the given C<AnyEvent::TLS> object to create the new TLS connection |
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283 | (unless a connection object was specified directly). If this parameter is |
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284 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
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285 | |
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286 | Instead of an object, you can also specify a hash reference with C<< key |
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287 | => value >> pairs. Those will be passed to L<AnyEvent::TLS> to create a |
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288 | new TLS context object. |
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289 | |
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290 | =item json => JSON or JSON::XS object |
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291 | |
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292 | This is the json coder object used by the C<json> read and write types. |
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293 | |
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294 | If you don't supply it, then AnyEvent::Handle will create and use a |
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295 | suitable one (on demand), which will write and expect UTF-8 encoded JSON |
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296 | texts. |
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297 | |
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298 | Note that you are responsible to depend on the JSON module if you want to |
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299 | use this functionality, as AnyEvent does not have a dependency itself. |
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300 | |
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301 | =back |
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302 | |
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303 | =cut |
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304 | |
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305 | sub new { |
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306 | my $class = shift; |
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307 | my $self = bless { @_ }, $class; |
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308 | |
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309 | $self->{fh} or Carp::croak "mandatory argument fh is missing"; |
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310 | |
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311 | AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
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312 | |
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313 | $self->{_activity} = AnyEvent->now; |
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314 | $self->_timeout; |
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315 | |
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316 | $self->no_delay (delete $self->{no_delay}) if exists $self->{no_delay}; |
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317 | |
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318 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}) |
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319 | if $self->{tls}; |
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320 | |
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321 | $self->on_drain (delete $self->{on_drain}) if exists $self->{on_drain}; |
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322 | |
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323 | $self->start_read |
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324 | if $self->{on_read}; |
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325 | |
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326 | $self->{fh} && $self |
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327 | } |
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328 | |
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329 | sub _shutdown { |
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330 | my ($self) = @_; |
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331 | |
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332 | delete @$self{qw(_tw _rw _ww fh rbuf wbuf on_read _queue)}; |
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333 | $self->{_eof} = 1; # tell starttls et. al to stop trying |
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334 | |
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335 | &_freetls; |
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336 | } |
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337 | |
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338 | sub _error { |
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339 | my ($self, $errno, $fatal) = @_; |
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340 | |
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341 | $self->_shutdown |
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342 | if $fatal; |
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343 | |
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344 | $! = $errno; |
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345 | |
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346 | if ($self->{on_error}) { |
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347 | $self->{on_error}($self, $fatal); |
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348 | } elsif ($self->{fh}) { |
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349 | Carp::croak "AnyEvent::Handle uncaught error: $!"; |
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350 | } |
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351 | } |
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352 | |
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353 | =item $fh = $handle->fh |
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354 | |
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355 | This method returns the file handle used to create the L<AnyEvent::Handle> object. |
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356 | |
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357 | =cut |
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358 | |
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359 | sub fh { $_[0]{fh} } |
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360 | |
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361 | =item $handle->on_error ($cb) |
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362 | |
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363 | Replace the current C<on_error> callback (see the C<on_error> constructor argument). |
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364 | |
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365 | =cut |
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366 | |
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367 | sub on_error { |
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368 | $_[0]{on_error} = $_[1]; |
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369 | } |
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370 | |
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371 | =item $handle->on_eof ($cb) |
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372 | |
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373 | Replace the current C<on_eof> callback (see the C<on_eof> constructor argument). |
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374 | |
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375 | =cut |
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376 | |
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377 | sub on_eof { |
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378 | $_[0]{on_eof} = $_[1]; |
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379 | } |
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380 | |
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381 | =item $handle->on_timeout ($cb) |
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382 | |
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383 | Replace the current C<on_timeout> callback, or disables the callback (but |
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384 | not the timeout) if C<$cb> = C<undef>. See the C<timeout> constructor |
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385 | argument and method. |
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386 | |
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387 | =cut |
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388 | |
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389 | sub on_timeout { |
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390 | $_[0]{on_timeout} = $_[1]; |
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391 | } |
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392 | |
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393 | =item $handle->autocork ($boolean) |
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394 | |
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395 | Enables or disables the current autocork behaviour (see C<autocork> |
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396 | constructor argument). Changes will only take effect on the next write. |
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397 | |
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398 | =cut |
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399 | |
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400 | sub autocork { |
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401 | $_[0]{autocork} = $_[1]; |
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402 | } |
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403 | |
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404 | =item $handle->no_delay ($boolean) |
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405 | |
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406 | Enables or disables the C<no_delay> setting (see constructor argument of |
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407 | the same name for details). |
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408 | |
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409 | =cut |
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410 | |
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411 | sub no_delay { |
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412 | $_[0]{no_delay} = $_[1]; |
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413 | |
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414 | eval { |
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415 | local $SIG{__DIE__}; |
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416 | setsockopt $_[0]{fh}, &Socket::IPPROTO_TCP, &Socket::TCP_NODELAY, int $_[1]; |
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417 | }; |
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418 | } |
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419 | |
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420 | ############################################################################# |
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|
421 | |
|
|
422 | =item $handle->timeout ($seconds) |
|
|
423 | |
|
|
424 | Configures (or disables) the inactivity timeout. |
|
|
425 | |
|
|
426 | =cut |
|
|
427 | |
|
|
428 | sub timeout { |
|
|
429 | my ($self, $timeout) = @_; |
|
|
430 | |
|
|
431 | $self->{timeout} = $timeout; |
|
|
432 | $self->_timeout; |
|
|
433 | } |
|
|
434 | |
|
|
435 | # reset the timeout watcher, as neccessary |
|
|
436 | # also check for time-outs |
|
|
437 | sub _timeout { |
|
|
438 | my ($self) = @_; |
|
|
439 | |
|
|
440 | if ($self->{timeout}) { |
|
|
441 | my $NOW = AnyEvent->now; |
|
|
442 | |
|
|
443 | # when would the timeout trigger? |
|
|
444 | my $after = $self->{_activity} + $self->{timeout} - $NOW; |
|
|
445 | |
|
|
446 | # now or in the past already? |
|
|
447 | if ($after <= 0) { |
|
|
448 | $self->{_activity} = $NOW; |
|
|
449 | |
|
|
450 | if ($self->{on_timeout}) { |
|
|
451 | $self->{on_timeout}($self); |
|
|
452 | } else { |
|
|
453 | $self->_error (&Errno::ETIMEDOUT); |
|
|
454 | } |
|
|
455 | |
|
|
456 | # callback could have changed timeout value, optimise |
|
|
457 | return unless $self->{timeout}; |
|
|
458 | |
|
|
459 | # calculate new after |
|
|
460 | $after = $self->{timeout}; |
36 | } |
461 | } |
37 | $cv->broadcast; |
462 | |
|
|
463 | Scalar::Util::weaken $self; |
|
|
464 | return unless $self; # ->error could have destroyed $self |
|
|
465 | |
|
|
466 | $self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub { |
|
|
467 | delete $self->{_tw}; |
|
|
468 | $self->_timeout; |
|
|
469 | }); |
|
|
470 | } else { |
|
|
471 | delete $self->{_tw}; |
|
|
472 | } |
|
|
473 | } |
|
|
474 | |
|
|
475 | ############################################################################# |
|
|
476 | |
|
|
477 | =back |
|
|
478 | |
|
|
479 | =head2 WRITE QUEUE |
|
|
480 | |
|
|
481 | AnyEvent::Handle manages two queues per handle, one for writing and one |
|
|
482 | for reading. |
|
|
483 | |
|
|
484 | The write queue is very simple: you can add data to its end, and |
|
|
485 | AnyEvent::Handle will automatically try to get rid of it for you. |
|
|
486 | |
|
|
487 | When data could be written and the write buffer is shorter then the low |
|
|
488 | water mark, the C<on_drain> callback will be invoked. |
|
|
489 | |
|
|
490 | =over 4 |
|
|
491 | |
|
|
492 | =item $handle->on_drain ($cb) |
|
|
493 | |
|
|
494 | Sets the C<on_drain> callback or clears it (see the description of |
|
|
495 | C<on_drain> in the constructor). |
|
|
496 | |
|
|
497 | =cut |
|
|
498 | |
|
|
499 | sub on_drain { |
|
|
500 | my ($self, $cb) = @_; |
|
|
501 | |
|
|
502 | $self->{on_drain} = $cb; |
|
|
503 | |
|
|
504 | $cb->($self) |
|
|
505 | if $cb && $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf}); |
|
|
506 | } |
|
|
507 | |
|
|
508 | =item $handle->push_write ($data) |
|
|
509 | |
|
|
510 | Queues the given scalar to be written. You can push as much data as you |
|
|
511 | want (only limited by the available memory), as C<AnyEvent::Handle> |
|
|
512 | buffers it independently of the kernel. |
|
|
513 | |
|
|
514 | =cut |
|
|
515 | |
|
|
516 | sub _drain_wbuf { |
|
|
517 | my ($self) = @_; |
|
|
518 | |
|
|
519 | if (!$self->{_ww} && length $self->{wbuf}) { |
|
|
520 | |
|
|
521 | Scalar::Util::weaken $self; |
|
|
522 | |
|
|
523 | my $cb = sub { |
|
|
524 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
|
|
525 | |
|
|
526 | if ($len >= 0) { |
|
|
527 | substr $self->{wbuf}, 0, $len, ""; |
|
|
528 | |
|
|
529 | $self->{_activity} = AnyEvent->now; |
|
|
530 | |
|
|
531 | $self->{on_drain}($self) |
|
|
532 | if $self->{low_water_mark} >= (length $self->{wbuf}) + (length $self->{_tls_wbuf}) |
|
|
533 | && $self->{on_drain}; |
|
|
534 | |
|
|
535 | delete $self->{_ww} unless length $self->{wbuf}; |
|
|
536 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
|
|
537 | $self->_error ($!, 1); |
|
|
538 | } |
|
|
539 | }; |
|
|
540 | |
|
|
541 | # try to write data immediately |
|
|
542 | $cb->() unless $self->{autocork}; |
|
|
543 | |
|
|
544 | # if still data left in wbuf, we need to poll |
|
|
545 | $self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb) |
|
|
546 | if length $self->{wbuf}; |
|
|
547 | }; |
|
|
548 | } |
|
|
549 | |
|
|
550 | our %WH; |
|
|
551 | |
|
|
552 | sub register_write_type($$) { |
|
|
553 | $WH{$_[0]} = $_[1]; |
|
|
554 | } |
|
|
555 | |
|
|
556 | sub push_write { |
|
|
557 | my $self = shift; |
|
|
558 | |
|
|
559 | if (@_ > 1) { |
|
|
560 | my $type = shift; |
|
|
561 | |
|
|
562 | @_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write") |
|
|
563 | ->($self, @_); |
|
|
564 | } |
|
|
565 | |
|
|
566 | if ($self->{tls}) { |
|
|
567 | $self->{_tls_wbuf} .= $_[0]; |
|
|
568 | |
|
|
569 | &_dotls ($self); |
|
|
570 | } else { |
|
|
571 | $self->{wbuf} .= $_[0]; |
|
|
572 | $self->_drain_wbuf; |
|
|
573 | } |
|
|
574 | } |
|
|
575 | |
|
|
576 | =item $handle->push_write (type => @args) |
|
|
577 | |
|
|
578 | Instead of formatting your data yourself, you can also let this module do |
|
|
579 | the job by specifying a type and type-specific arguments. |
|
|
580 | |
|
|
581 | Predefined types are (if you have ideas for additional types, feel free to |
|
|
582 | drop by and tell us): |
|
|
583 | |
|
|
584 | =over 4 |
|
|
585 | |
|
|
586 | =item netstring => $string |
|
|
587 | |
|
|
588 | Formats the given value as netstring |
|
|
589 | (http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them). |
|
|
590 | |
|
|
591 | =cut |
|
|
592 | |
|
|
593 | register_write_type netstring => sub { |
|
|
594 | my ($self, $string) = @_; |
|
|
595 | |
|
|
596 | (length $string) . ":$string," |
|
|
597 | }; |
|
|
598 | |
|
|
599 | =item packstring => $format, $data |
|
|
600 | |
|
|
601 | An octet string prefixed with an encoded length. The encoding C<$format> |
|
|
602 | uses the same format as a Perl C<pack> format, but must specify a single |
|
|
603 | integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an |
|
|
604 | optional C<!>, C<< < >> or C<< > >> modifier). |
|
|
605 | |
|
|
606 | =cut |
|
|
607 | |
|
|
608 | register_write_type packstring => sub { |
|
|
609 | my ($self, $format, $string) = @_; |
|
|
610 | |
|
|
611 | pack "$format/a*", $string |
|
|
612 | }; |
|
|
613 | |
|
|
614 | =item json => $array_or_hashref |
|
|
615 | |
|
|
616 | Encodes the given hash or array reference into a JSON object. Unless you |
|
|
617 | provide your own JSON object, this means it will be encoded to JSON text |
|
|
618 | in UTF-8. |
|
|
619 | |
|
|
620 | JSON objects (and arrays) are self-delimiting, so you can write JSON at |
|
|
621 | one end of a handle and read them at the other end without using any |
|
|
622 | additional framing. |
|
|
623 | |
|
|
624 | The generated JSON text is guaranteed not to contain any newlines: While |
|
|
625 | this module doesn't need delimiters after or between JSON texts to be |
|
|
626 | able to read them, many other languages depend on that. |
|
|
627 | |
|
|
628 | A simple RPC protocol that interoperates easily with others is to send |
|
|
629 | JSON arrays (or objects, although arrays are usually the better choice as |
|
|
630 | they mimic how function argument passing works) and a newline after each |
|
|
631 | JSON text: |
|
|
632 | |
|
|
633 | $handle->push_write (json => ["method", "arg1", "arg2"]); # whatever |
|
|
634 | $handle->push_write ("\012"); |
|
|
635 | |
|
|
636 | An AnyEvent::Handle receiver would simply use the C<json> read type and |
|
|
637 | rely on the fact that the newline will be skipped as leading whitespace: |
|
|
638 | |
|
|
639 | $handle->push_read (json => sub { my $array = $_[1]; ... }); |
|
|
640 | |
|
|
641 | Other languages could read single lines terminated by a newline and pass |
|
|
642 | this line into their JSON decoder of choice. |
|
|
643 | |
|
|
644 | =cut |
|
|
645 | |
|
|
646 | register_write_type json => sub { |
|
|
647 | my ($self, $ref) = @_; |
|
|
648 | |
|
|
649 | require JSON; |
|
|
650 | |
|
|
651 | $self->{json} ? $self->{json}->encode ($ref) |
|
|
652 | : JSON::encode_json ($ref) |
|
|
653 | }; |
|
|
654 | |
|
|
655 | =item storable => $reference |
|
|
656 | |
|
|
657 | Freezes the given reference using L<Storable> and writes it to the |
|
|
658 | handle. Uses the C<nfreeze> format. |
|
|
659 | |
|
|
660 | =cut |
|
|
661 | |
|
|
662 | register_write_type storable => sub { |
|
|
663 | my ($self, $ref) = @_; |
|
|
664 | |
|
|
665 | require Storable; |
|
|
666 | |
|
|
667 | pack "w/a*", Storable::nfreeze ($ref) |
|
|
668 | }; |
|
|
669 | |
|
|
670 | =back |
|
|
671 | |
|
|
672 | =item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args) |
|
|
673 | |
|
|
674 | This function (not method) lets you add your own types to C<push_write>. |
|
|
675 | Whenever the given C<type> is used, C<push_write> will invoke the code |
|
|
676 | reference with the handle object and the remaining arguments. |
|
|
677 | |
|
|
678 | The code reference is supposed to return a single octet string that will |
|
|
679 | be appended to the write buffer. |
|
|
680 | |
|
|
681 | Note that this is a function, and all types registered this way will be |
|
|
682 | global, so try to use unique names. |
|
|
683 | |
|
|
684 | =cut |
|
|
685 | |
|
|
686 | ############################################################################# |
|
|
687 | |
|
|
688 | =back |
|
|
689 | |
|
|
690 | =head2 READ QUEUE |
|
|
691 | |
|
|
692 | AnyEvent::Handle manages two queues per handle, one for writing and one |
|
|
693 | for reading. |
|
|
694 | |
|
|
695 | The read queue is more complex than the write queue. It can be used in two |
|
|
696 | ways, the "simple" way, using only C<on_read> and the "complex" way, using |
|
|
697 | a queue. |
|
|
698 | |
|
|
699 | In the simple case, you just install an C<on_read> callback and whenever |
|
|
700 | new data arrives, it will be called. You can then remove some data (if |
|
|
701 | enough is there) from the read buffer (C<< $handle->rbuf >>). Or you cna |
|
|
702 | leave the data there if you want to accumulate more (e.g. when only a |
|
|
703 | partial message has been received so far). |
|
|
704 | |
|
|
705 | In the more complex case, you want to queue multiple callbacks. In this |
|
|
706 | case, AnyEvent::Handle will call the first queued callback each time new |
|
|
707 | data arrives (also the first time it is queued) and removes it when it has |
|
|
708 | done its job (see C<push_read>, below). |
|
|
709 | |
|
|
710 | This way you can, for example, push three line-reads, followed by reading |
|
|
711 | a chunk of data, and AnyEvent::Handle will execute them in order. |
|
|
712 | |
|
|
713 | Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by |
|
|
714 | the specified number of bytes which give an XML datagram. |
|
|
715 | |
|
|
716 | # in the default state, expect some header bytes |
|
|
717 | $handle->on_read (sub { |
|
|
718 | # some data is here, now queue the length-header-read (4 octets) |
|
|
719 | shift->unshift_read (chunk => 4, sub { |
|
|
720 | # header arrived, decode |
|
|
721 | my $len = unpack "N", $_[1]; |
|
|
722 | |
|
|
723 | # now read the payload |
|
|
724 | shift->unshift_read (chunk => $len, sub { |
|
|
725 | my $xml = $_[1]; |
|
|
726 | # handle xml |
|
|
727 | }); |
|
|
728 | }); |
38 | }); |
729 | }); |
39 | |
730 | |
40 | $cv->wait; |
731 | Example 2: Implement a client for a protocol that replies either with "OK" |
|
|
732 | and another line or "ERROR" for the first request that is sent, and 64 |
|
|
733 | bytes for the second request. Due to the availability of a queue, we can |
|
|
734 | just pipeline sending both requests and manipulate the queue as necessary |
|
|
735 | in the callbacks. |
41 | |
736 | |
42 | =head1 DESCRIPTION |
737 | When the first callback is called and sees an "OK" response, it will |
|
|
738 | C<unshift> another line-read. This line-read will be queued I<before> the |
|
|
739 | 64-byte chunk callback. |
43 | |
740 | |
44 | This module is a helper module to make it easier to do non-blocking I/O |
741 | # request one, returns either "OK + extra line" or "ERROR" |
45 | on filehandles (and sockets, see L<AnyEvent::Socket>). |
742 | $handle->push_write ("request 1\015\012"); |
46 | |
743 | |
47 | The event loop is provided by L<AnyEvent>. |
744 | # we expect "ERROR" or "OK" as response, so push a line read |
|
|
745 | $handle->push_read (line => sub { |
|
|
746 | # if we got an "OK", we have to _prepend_ another line, |
|
|
747 | # so it will be read before the second request reads its 64 bytes |
|
|
748 | # which are already in the queue when this callback is called |
|
|
749 | # we don't do this in case we got an error |
|
|
750 | if ($_[1] eq "OK") { |
|
|
751 | $_[0]->unshift_read (line => sub { |
|
|
752 | my $response = $_[1]; |
|
|
753 | ... |
|
|
754 | }); |
|
|
755 | } |
|
|
756 | }); |
48 | |
757 | |
49 | =head1 METHODS |
758 | # request two, simply returns 64 octets |
|
|
759 | $handle->push_write ("request 2\015\012"); |
|
|
760 | |
|
|
761 | # simply read 64 bytes, always |
|
|
762 | $handle->push_read (chunk => 64, sub { |
|
|
763 | my $response = $_[1]; |
|
|
764 | ... |
|
|
765 | }); |
50 | |
766 | |
51 | =over 4 |
767 | =over 4 |
52 | |
768 | |
53 | =item B<new (%args)> |
|
|
54 | |
|
|
55 | The constructor has these arguments: |
|
|
56 | |
|
|
57 | =over 4 |
|
|
58 | |
|
|
59 | =item fh => $filehandle |
|
|
60 | |
|
|
61 | The filehandle this L<AnyEvent::Handle> object will operate on. |
|
|
62 | |
|
|
63 | NOTE: The filehandle will be set to non-blocking. |
|
|
64 | |
|
|
65 | =item read_block_size => $size |
|
|
66 | |
|
|
67 | The default read block size use for reads via the C<on_read> |
|
|
68 | method. |
|
|
69 | |
|
|
70 | =back |
|
|
71 | |
|
|
72 | =cut |
769 | =cut |
73 | |
770 | |
74 | sub new { |
771 | sub _drain_rbuf { |
75 | my $this = shift; |
|
|
76 | my $class = ref($this) || $this; |
|
|
77 | my $self = { |
772 | my ($self) = @_; |
78 | read_block_size => 4096, |
773 | |
79 | rbuf => '', |
774 | local $self->{_in_drain} = 1; |
80 | @_ |
775 | |
|
|
776 | if ( |
|
|
777 | defined $self->{rbuf_max} |
|
|
778 | && $self->{rbuf_max} < length $self->{rbuf} |
|
|
779 | ) { |
|
|
780 | $self->_error (&Errno::ENOSPC, 1), return; |
81 | }; |
781 | } |
82 | bless $self, $class; |
|
|
83 | |
782 | |
84 | $self->{fh}->blocking (0) if $self->{fh}; |
783 | while () { |
|
|
784 | # we need to use a separate tls read buffer, as we must not receive data while |
|
|
785 | # we are draining the buffer, and this can only happen with TLS. |
|
|
786 | $self->{rbuf} .= delete $self->{_tls_rbuf} if exists $self->{_tls_rbuf}; |
85 | |
787 | |
86 | if ($self->{on_read}) { |
788 | my $len = length $self->{rbuf}; |
87 | $self->on_read ($self->{on_read}); |
|
|
88 | |
789 | |
|
|
790 | if (my $cb = shift @{ $self->{_queue} }) { |
|
|
791 | unless ($cb->($self)) { |
|
|
792 | if ($self->{_eof}) { |
|
|
793 | # no progress can be made (not enough data and no data forthcoming) |
|
|
794 | $self->_error (&Errno::EPIPE, 1), return; |
|
|
795 | } |
|
|
796 | |
|
|
797 | unshift @{ $self->{_queue} }, $cb; |
|
|
798 | last; |
|
|
799 | } |
89 | } elsif ($self->{on_readline}) { |
800 | } elsif ($self->{on_read}) { |
90 | $self->readlines ($self->{on_readline}); |
801 | last unless $len; |
91 | } |
|
|
92 | |
802 | |
93 | return $self |
803 | $self->{on_read}($self); |
94 | } |
|
|
95 | |
804 | |
96 | =item B<fh> |
805 | if ( |
|
|
806 | $len == length $self->{rbuf} # if no data has been consumed |
|
|
807 | && !@{ $self->{_queue} } # and the queue is still empty |
|
|
808 | && $self->{on_read} # but we still have on_read |
|
|
809 | ) { |
|
|
810 | # no further data will arrive |
|
|
811 | # so no progress can be made |
|
|
812 | $self->_error (&Errno::EPIPE, 1), return |
|
|
813 | if $self->{_eof}; |
97 | |
814 | |
98 | This method returns the filehandle of the L<AnyEvent::Handle> object. |
815 | last; # more data might arrive |
|
|
816 | } |
|
|
817 | } else { |
|
|
818 | # read side becomes idle |
|
|
819 | delete $self->{_rw} unless $self->{tls}; |
|
|
820 | last; |
|
|
821 | } |
|
|
822 | } |
99 | |
823 | |
100 | =cut |
824 | if ($self->{_eof}) { |
|
|
825 | if ($self->{on_eof}) { |
|
|
826 | $self->{on_eof}($self) |
|
|
827 | } else { |
|
|
828 | $self->_error (0, 1); |
|
|
829 | } |
|
|
830 | } |
101 | |
831 | |
102 | sub fh { $_[0]->{fh} } |
832 | # may need to restart read watcher |
|
|
833 | unless ($self->{_rw}) { |
|
|
834 | $self->start_read |
|
|
835 | if $self->{on_read} || @{ $self->{_queue} }; |
|
|
836 | } |
|
|
837 | } |
103 | |
838 | |
104 | =item B<on_read ($callback)> |
839 | =item $handle->on_read ($cb) |
105 | |
840 | |
106 | This method installs a C<$callback> that will be called |
841 | This replaces the currently set C<on_read> callback, or clears it (when |
107 | when new data arrived. You can access the read buffer via the C<rbuf> |
842 | the new callback is C<undef>). See the description of C<on_read> in the |
108 | method (see below). |
843 | constructor. |
109 | |
|
|
110 | The first argument of the C<$callback> will be the L<AnyEvent::Handle> object. |
|
|
111 | |
844 | |
112 | =cut |
845 | =cut |
113 | |
846 | |
114 | sub on_read { |
847 | sub on_read { |
115 | my ($self, $cb) = @_; |
848 | my ($self, $cb) = @_; |
|
|
849 | |
116 | $self->{on_read} = $cb; |
850 | $self->{on_read} = $cb; |
|
|
851 | $self->_drain_rbuf if $cb && !$self->{_in_drain}; |
|
|
852 | } |
117 | |
853 | |
118 | unless (defined $self->{on_read}) { |
854 | =item $handle->rbuf |
119 | delete $self->{on_read_w}; |
855 | |
|
|
856 | Returns the read buffer (as a modifiable lvalue). |
|
|
857 | |
|
|
858 | You can access the read buffer directly as the C<< ->{rbuf} >> |
|
|
859 | member, if you want. However, the only operation allowed on the |
|
|
860 | read buffer (apart from looking at it) is removing data from its |
|
|
861 | beginning. Otherwise modifying or appending to it is not allowed and will |
|
|
862 | lead to hard-to-track-down bugs. |
|
|
863 | |
|
|
864 | NOTE: The read buffer should only be used or modified if the C<on_read>, |
|
|
865 | C<push_read> or C<unshift_read> methods are used. The other read methods |
|
|
866 | automatically manage the read buffer. |
|
|
867 | |
|
|
868 | =cut |
|
|
869 | |
|
|
870 | sub rbuf : lvalue { |
|
|
871 | $_[0]{rbuf} |
|
|
872 | } |
|
|
873 | |
|
|
874 | =item $handle->push_read ($cb) |
|
|
875 | |
|
|
876 | =item $handle->unshift_read ($cb) |
|
|
877 | |
|
|
878 | Append the given callback to the end of the queue (C<push_read>) or |
|
|
879 | prepend it (C<unshift_read>). |
|
|
880 | |
|
|
881 | The callback is called each time some additional read data arrives. |
|
|
882 | |
|
|
883 | It must check whether enough data is in the read buffer already. |
|
|
884 | |
|
|
885 | If not enough data is available, it must return the empty list or a false |
|
|
886 | value, in which case it will be called repeatedly until enough data is |
|
|
887 | available (or an error condition is detected). |
|
|
888 | |
|
|
889 | If enough data was available, then the callback must remove all data it is |
|
|
890 | interested in (which can be none at all) and return a true value. After returning |
|
|
891 | true, it will be removed from the queue. |
|
|
892 | |
|
|
893 | =cut |
|
|
894 | |
|
|
895 | our %RH; |
|
|
896 | |
|
|
897 | sub register_read_type($$) { |
|
|
898 | $RH{$_[0]} = $_[1]; |
|
|
899 | } |
|
|
900 | |
|
|
901 | sub push_read { |
|
|
902 | my $self = shift; |
|
|
903 | my $cb = pop; |
|
|
904 | |
|
|
905 | if (@_) { |
|
|
906 | my $type = shift; |
|
|
907 | |
|
|
908 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read") |
|
|
909 | ->($self, $cb, @_); |
|
|
910 | } |
|
|
911 | |
|
|
912 | push @{ $self->{_queue} }, $cb; |
|
|
913 | $self->_drain_rbuf unless $self->{_in_drain}; |
|
|
914 | } |
|
|
915 | |
|
|
916 | sub unshift_read { |
|
|
917 | my $self = shift; |
|
|
918 | my $cb = pop; |
|
|
919 | |
|
|
920 | if (@_) { |
|
|
921 | my $type = shift; |
|
|
922 | |
|
|
923 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read") |
|
|
924 | ->($self, $cb, @_); |
|
|
925 | } |
|
|
926 | |
|
|
927 | |
|
|
928 | unshift @{ $self->{_queue} }, $cb; |
|
|
929 | $self->_drain_rbuf unless $self->{_in_drain}; |
|
|
930 | } |
|
|
931 | |
|
|
932 | =item $handle->push_read (type => @args, $cb) |
|
|
933 | |
|
|
934 | =item $handle->unshift_read (type => @args, $cb) |
|
|
935 | |
|
|
936 | Instead of providing a callback that parses the data itself you can chose |
|
|
937 | between a number of predefined parsing formats, for chunks of data, lines |
|
|
938 | etc. |
|
|
939 | |
|
|
940 | Predefined types are (if you have ideas for additional types, feel free to |
|
|
941 | drop by and tell us): |
|
|
942 | |
|
|
943 | =over 4 |
|
|
944 | |
|
|
945 | =item chunk => $octets, $cb->($handle, $data) |
|
|
946 | |
|
|
947 | Invoke the callback only once C<$octets> bytes have been read. Pass the |
|
|
948 | data read to the callback. The callback will never be called with less |
|
|
949 | data. |
|
|
950 | |
|
|
951 | Example: read 2 bytes. |
|
|
952 | |
|
|
953 | $handle->push_read (chunk => 2, sub { |
|
|
954 | warn "yay ", unpack "H*", $_[1]; |
|
|
955 | }); |
|
|
956 | |
|
|
957 | =cut |
|
|
958 | |
|
|
959 | register_read_type chunk => sub { |
|
|
960 | my ($self, $cb, $len) = @_; |
|
|
961 | |
|
|
962 | sub { |
|
|
963 | $len <= length $_[0]{rbuf} or return; |
|
|
964 | $cb->($_[0], substr $_[0]{rbuf}, 0, $len, ""); |
|
|
965 | 1 |
|
|
966 | } |
|
|
967 | }; |
|
|
968 | |
|
|
969 | =item line => [$eol, ]$cb->($handle, $line, $eol) |
|
|
970 | |
|
|
971 | The callback will be called only once a full line (including the end of |
|
|
972 | line marker, C<$eol>) has been read. This line (excluding the end of line |
|
|
973 | marker) will be passed to the callback as second argument (C<$line>), and |
|
|
974 | the end of line marker as the third argument (C<$eol>). |
|
|
975 | |
|
|
976 | The end of line marker, C<$eol>, can be either a string, in which case it |
|
|
977 | will be interpreted as a fixed record end marker, or it can be a regex |
|
|
978 | object (e.g. created by C<qr>), in which case it is interpreted as a |
|
|
979 | regular expression. |
|
|
980 | |
|
|
981 | The end of line marker argument C<$eol> is optional, if it is missing (NOT |
|
|
982 | undef), then C<qr|\015?\012|> is used (which is good for most internet |
|
|
983 | protocols). |
|
|
984 | |
|
|
985 | Partial lines at the end of the stream will never be returned, as they are |
|
|
986 | not marked by the end of line marker. |
|
|
987 | |
|
|
988 | =cut |
|
|
989 | |
|
|
990 | register_read_type line => sub { |
|
|
991 | my ($self, $cb, $eol) = @_; |
|
|
992 | |
|
|
993 | if (@_ < 3) { |
|
|
994 | # this is more than twice as fast as the generic code below |
|
|
995 | sub { |
|
|
996 | $_[0]{rbuf} =~ s/^([^\015\012]*)(\015?\012)// or return; |
|
|
997 | |
|
|
998 | $cb->($_[0], $1, $2); |
|
|
999 | 1 |
|
|
1000 | } |
|
|
1001 | } else { |
|
|
1002 | $eol = quotemeta $eol unless ref $eol; |
|
|
1003 | $eol = qr|^(.*?)($eol)|s; |
|
|
1004 | |
|
|
1005 | sub { |
|
|
1006 | $_[0]{rbuf} =~ s/$eol// or return; |
|
|
1007 | |
|
|
1008 | $cb->($_[0], $1, $2); |
|
|
1009 | 1 |
|
|
1010 | } |
|
|
1011 | } |
|
|
1012 | }; |
|
|
1013 | |
|
|
1014 | =item regex => $accept[, $reject[, $skip], $cb->($handle, $data) |
|
|
1015 | |
|
|
1016 | Makes a regex match against the regex object C<$accept> and returns |
|
|
1017 | everything up to and including the match. |
|
|
1018 | |
|
|
1019 | Example: read a single line terminated by '\n'. |
|
|
1020 | |
|
|
1021 | $handle->push_read (regex => qr<\n>, sub { ... }); |
|
|
1022 | |
|
|
1023 | If C<$reject> is given and not undef, then it determines when the data is |
|
|
1024 | to be rejected: it is matched against the data when the C<$accept> regex |
|
|
1025 | does not match and generates an C<EBADMSG> error when it matches. This is |
|
|
1026 | useful to quickly reject wrong data (to avoid waiting for a timeout or a |
|
|
1027 | receive buffer overflow). |
|
|
1028 | |
|
|
1029 | Example: expect a single decimal number followed by whitespace, reject |
|
|
1030 | anything else (not the use of an anchor). |
|
|
1031 | |
|
|
1032 | $handle->push_read (regex => qr<^[0-9]+\s>, qr<[^0-9]>, sub { ... }); |
|
|
1033 | |
|
|
1034 | If C<$skip> is given and not C<undef>, then it will be matched against |
|
|
1035 | the receive buffer when neither C<$accept> nor C<$reject> match, |
|
|
1036 | and everything preceding and including the match will be accepted |
|
|
1037 | unconditionally. This is useful to skip large amounts of data that you |
|
|
1038 | know cannot be matched, so that the C<$accept> or C<$reject> regex do not |
|
|
1039 | have to start matching from the beginning. This is purely an optimisation |
|
|
1040 | and is usually worth only when you expect more than a few kilobytes. |
|
|
1041 | |
|
|
1042 | Example: expect a http header, which ends at C<\015\012\015\012>. Since we |
|
|
1043 | expect the header to be very large (it isn't in practise, but...), we use |
|
|
1044 | a skip regex to skip initial portions. The skip regex is tricky in that |
|
|
1045 | it only accepts something not ending in either \015 or \012, as these are |
|
|
1046 | required for the accept regex. |
|
|
1047 | |
|
|
1048 | $handle->push_read (regex => |
|
|
1049 | qr<\015\012\015\012>, |
|
|
1050 | undef, # no reject |
|
|
1051 | qr<^.*[^\015\012]>, |
|
|
1052 | sub { ... }); |
|
|
1053 | |
|
|
1054 | =cut |
|
|
1055 | |
|
|
1056 | register_read_type regex => sub { |
|
|
1057 | my ($self, $cb, $accept, $reject, $skip) = @_; |
|
|
1058 | |
|
|
1059 | my $data; |
|
|
1060 | my $rbuf = \$self->{rbuf}; |
|
|
1061 | |
|
|
1062 | sub { |
|
|
1063 | # accept |
|
|
1064 | if ($$rbuf =~ $accept) { |
|
|
1065 | $data .= substr $$rbuf, 0, $+[0], ""; |
|
|
1066 | $cb->($self, $data); |
120 | return; |
1067 | return 1; |
|
|
1068 | } |
|
|
1069 | |
|
|
1070 | # reject |
|
|
1071 | if ($reject && $$rbuf =~ $reject) { |
|
|
1072 | $self->_error (&Errno::EBADMSG); |
|
|
1073 | } |
|
|
1074 | |
|
|
1075 | # skip |
|
|
1076 | if ($skip && $$rbuf =~ $skip) { |
|
|
1077 | $data .= substr $$rbuf, 0, $+[0], ""; |
|
|
1078 | } |
|
|
1079 | |
|
|
1080 | () |
121 | } |
1081 | } |
122 | |
1082 | }; |
123 | $self->{on_read_w} = |
1083 | |
124 | AnyEvent->io (poll => 'r', fh => $self->{fh}, cb => sub { |
1084 | =item netstring => $cb->($handle, $string) |
125 | #d# warn "READ:[$self->{read_size}] $self->{read_block_size} : ".length ($self->{rbuf})."\n"; |
1085 | |
126 | my $rbuf_len = length $self->{rbuf}; |
1086 | A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement). |
127 | my $l; |
1087 | |
128 | if (defined $self->{read_size}) { |
1088 | Throws an error with C<$!> set to EBADMSG on format violations. |
129 | $l = sysread $self->{fh}, $self->{rbuf}, |
1089 | |
130 | ($self->{read_size} - $rbuf_len), $rbuf_len; |
1090 | =cut |
131 | } else { |
1091 | |
132 | $l = sysread $self->{fh}, $self->{rbuf}, $self->{read_block_size}, $rbuf_len; |
1092 | register_read_type netstring => sub { |
|
|
1093 | my ($self, $cb) = @_; |
|
|
1094 | |
|
|
1095 | sub { |
|
|
1096 | unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) { |
|
|
1097 | if ($_[0]{rbuf} =~ /[^0-9]/) { |
|
|
1098 | $self->_error (&Errno::EBADMSG); |
133 | } |
1099 | } |
134 | #d# warn "READL $l [$self->{rbuf}]\n"; |
1100 | return; |
|
|
1101 | } |
135 | |
1102 | |
136 | if (not defined $l) { |
1103 | my $len = $1; |
137 | return if $! == EAGAIN || $! == EINTR; |
|
|
138 | $self->{on_error}->($self, $!) if $self->{on_error}; |
|
|
139 | delete $self->{on_read_w}; |
|
|
140 | |
1104 | |
141 | } elsif ($l == 0) { |
1105 | $self->unshift_read (chunk => $len, sub { |
142 | $self->{on_eof}->($self) if $self->{on_eof}; |
1106 | my $string = $_[1]; |
143 | delete $self->{on_read_w}; |
1107 | $_[0]->unshift_read (chunk => 1, sub { |
144 | |
1108 | if ($_[1] eq ",") { |
|
|
1109 | $cb->($_[0], $string); |
145 | } else { |
1110 | } else { |
146 | $self->{on_read}->($self); |
1111 | $self->_error (&Errno::EBADMSG); |
|
|
1112 | } |
|
|
1113 | }); |
|
|
1114 | }); |
|
|
1115 | |
|
|
1116 | 1 |
|
|
1117 | } |
|
|
1118 | }; |
|
|
1119 | |
|
|
1120 | =item packstring => $format, $cb->($handle, $string) |
|
|
1121 | |
|
|
1122 | An octet string prefixed with an encoded length. The encoding C<$format> |
|
|
1123 | uses the same format as a Perl C<pack> format, but must specify a single |
|
|
1124 | integer only (only one of C<cCsSlLqQiInNvVjJw> is allowed, plus an |
|
|
1125 | optional C<!>, C<< < >> or C<< > >> modifier). |
|
|
1126 | |
|
|
1127 | For example, DNS over TCP uses a prefix of C<n> (2 octet network order), |
|
|
1128 | EPP uses a prefix of C<N> (4 octtes). |
|
|
1129 | |
|
|
1130 | Example: read a block of data prefixed by its length in BER-encoded |
|
|
1131 | format (very efficient). |
|
|
1132 | |
|
|
1133 | $handle->push_read (packstring => "w", sub { |
|
|
1134 | my ($handle, $data) = @_; |
|
|
1135 | }); |
|
|
1136 | |
|
|
1137 | =cut |
|
|
1138 | |
|
|
1139 | register_read_type packstring => sub { |
|
|
1140 | my ($self, $cb, $format) = @_; |
|
|
1141 | |
|
|
1142 | sub { |
|
|
1143 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
|
|
1144 | defined (my $len = eval { unpack $format, $_[0]{rbuf} }) |
|
|
1145 | or return; |
|
|
1146 | |
|
|
1147 | $format = length pack $format, $len; |
|
|
1148 | |
|
|
1149 | # bypass unshift if we already have the remaining chunk |
|
|
1150 | if ($format + $len <= length $_[0]{rbuf}) { |
|
|
1151 | my $data = substr $_[0]{rbuf}, $format, $len; |
|
|
1152 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
|
|
1153 | $cb->($_[0], $data); |
|
|
1154 | } else { |
|
|
1155 | # remove prefix |
|
|
1156 | substr $_[0]{rbuf}, 0, $format, ""; |
|
|
1157 | |
|
|
1158 | # read remaining chunk |
|
|
1159 | $_[0]->unshift_read (chunk => $len, $cb); |
|
|
1160 | } |
|
|
1161 | |
|
|
1162 | 1 |
|
|
1163 | } |
|
|
1164 | }; |
|
|
1165 | |
|
|
1166 | =item json => $cb->($handle, $hash_or_arrayref) |
|
|
1167 | |
|
|
1168 | Reads a JSON object or array, decodes it and passes it to the |
|
|
1169 | callback. When a parse error occurs, an C<EBADMSG> error will be raised. |
|
|
1170 | |
|
|
1171 | If a C<json> object was passed to the constructor, then that will be used |
|
|
1172 | for the final decode, otherwise it will create a JSON coder expecting UTF-8. |
|
|
1173 | |
|
|
1174 | This read type uses the incremental parser available with JSON version |
|
|
1175 | 2.09 (and JSON::XS version 2.2) and above. You have to provide a |
|
|
1176 | dependency on your own: this module will load the JSON module, but |
|
|
1177 | AnyEvent does not depend on it itself. |
|
|
1178 | |
|
|
1179 | Since JSON texts are fully self-delimiting, the C<json> read and write |
|
|
1180 | types are an ideal simple RPC protocol: just exchange JSON datagrams. See |
|
|
1181 | the C<json> write type description, above, for an actual example. |
|
|
1182 | |
|
|
1183 | =cut |
|
|
1184 | |
|
|
1185 | register_read_type json => sub { |
|
|
1186 | my ($self, $cb) = @_; |
|
|
1187 | |
|
|
1188 | require JSON; |
|
|
1189 | |
|
|
1190 | my $data; |
|
|
1191 | my $rbuf = \$self->{rbuf}; |
|
|
1192 | |
|
|
1193 | my $json = $self->{json} ||= JSON->new->utf8; |
|
|
1194 | |
|
|
1195 | sub { |
|
|
1196 | my $ref = eval { $json->incr_parse ($self->{rbuf}) }; |
|
|
1197 | |
|
|
1198 | if ($ref) { |
|
|
1199 | $self->{rbuf} = $json->incr_text; |
|
|
1200 | $json->incr_text = ""; |
|
|
1201 | $cb->($self, $ref); |
|
|
1202 | |
|
|
1203 | 1 |
|
|
1204 | } elsif ($@) { |
|
|
1205 | # error case |
|
|
1206 | $json->incr_skip; |
|
|
1207 | |
|
|
1208 | $self->{rbuf} = $json->incr_text; |
|
|
1209 | $json->incr_text = ""; |
|
|
1210 | |
|
|
1211 | $self->_error (&Errno::EBADMSG); |
|
|
1212 | |
|
|
1213 | () |
|
|
1214 | } else { |
|
|
1215 | $self->{rbuf} = ""; |
|
|
1216 | |
|
|
1217 | () |
|
|
1218 | } |
|
|
1219 | } |
|
|
1220 | }; |
|
|
1221 | |
|
|
1222 | =item storable => $cb->($handle, $ref) |
|
|
1223 | |
|
|
1224 | Deserialises a L<Storable> frozen representation as written by the |
|
|
1225 | C<storable> write type (BER-encoded length prefix followed by nfreeze'd |
|
|
1226 | data). |
|
|
1227 | |
|
|
1228 | Raises C<EBADMSG> error if the data could not be decoded. |
|
|
1229 | |
|
|
1230 | =cut |
|
|
1231 | |
|
|
1232 | register_read_type storable => sub { |
|
|
1233 | my ($self, $cb) = @_; |
|
|
1234 | |
|
|
1235 | require Storable; |
|
|
1236 | |
|
|
1237 | sub { |
|
|
1238 | # when we can use 5.10 we can use ".", but for 5.8 we use the re-pack method |
|
|
1239 | defined (my $len = eval { unpack "w", $_[0]{rbuf} }) |
|
|
1240 | or return; |
|
|
1241 | |
|
|
1242 | my $format = length pack "w", $len; |
|
|
1243 | |
|
|
1244 | # bypass unshift if we already have the remaining chunk |
|
|
1245 | if ($format + $len <= length $_[0]{rbuf}) { |
|
|
1246 | my $data = substr $_[0]{rbuf}, $format, $len; |
|
|
1247 | substr $_[0]{rbuf}, 0, $format + $len, ""; |
|
|
1248 | $cb->($_[0], Storable::thaw ($data)); |
|
|
1249 | } else { |
|
|
1250 | # remove prefix |
|
|
1251 | substr $_[0]{rbuf}, 0, $format, ""; |
|
|
1252 | |
|
|
1253 | # read remaining chunk |
|
|
1254 | $_[0]->unshift_read (chunk => $len, sub { |
|
|
1255 | if (my $ref = eval { Storable::thaw ($_[1]) }) { |
|
|
1256 | $cb->($_[0], $ref); |
|
|
1257 | } else { |
|
|
1258 | $self->_error (&Errno::EBADMSG); |
|
|
1259 | } |
|
|
1260 | }); |
|
|
1261 | } |
|
|
1262 | |
|
|
1263 | 1 |
|
|
1264 | } |
|
|
1265 | }; |
|
|
1266 | |
|
|
1267 | =back |
|
|
1268 | |
|
|
1269 | =item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args) |
|
|
1270 | |
|
|
1271 | This function (not method) lets you add your own types to C<push_read>. |
|
|
1272 | |
|
|
1273 | Whenever the given C<type> is used, C<push_read> will invoke the code |
|
|
1274 | reference with the handle object, the callback and the remaining |
|
|
1275 | arguments. |
|
|
1276 | |
|
|
1277 | The code reference is supposed to return a callback (usually a closure) |
|
|
1278 | that works as a plain read callback (see C<< ->push_read ($cb) >>). |
|
|
1279 | |
|
|
1280 | It should invoke the passed callback when it is done reading (remember to |
|
|
1281 | pass C<$handle> as first argument as all other callbacks do that). |
|
|
1282 | |
|
|
1283 | Note that this is a function, and all types registered this way will be |
|
|
1284 | global, so try to use unique names. |
|
|
1285 | |
|
|
1286 | For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>, |
|
|
1287 | search for C<register_read_type>)). |
|
|
1288 | |
|
|
1289 | =item $handle->stop_read |
|
|
1290 | |
|
|
1291 | =item $handle->start_read |
|
|
1292 | |
|
|
1293 | In rare cases you actually do not want to read anything from the |
|
|
1294 | socket. In this case you can call C<stop_read>. Neither C<on_read> nor |
|
|
1295 | any queued callbacks will be executed then. To start reading again, call |
|
|
1296 | C<start_read>. |
|
|
1297 | |
|
|
1298 | Note that AnyEvent::Handle will automatically C<start_read> for you when |
|
|
1299 | you change the C<on_read> callback or push/unshift a read callback, and it |
|
|
1300 | will automatically C<stop_read> for you when neither C<on_read> is set nor |
|
|
1301 | there are any read requests in the queue. |
|
|
1302 | |
|
|
1303 | These methods will have no effect when in TLS mode (as TLS doesn't support |
|
|
1304 | half-duplex connections). |
|
|
1305 | |
|
|
1306 | =cut |
|
|
1307 | |
|
|
1308 | sub stop_read { |
|
|
1309 | my ($self) = @_; |
|
|
1310 | |
|
|
1311 | delete $self->{_rw} unless $self->{tls}; |
|
|
1312 | } |
|
|
1313 | |
|
|
1314 | sub start_read { |
|
|
1315 | my ($self) = @_; |
|
|
1316 | |
|
|
1317 | unless ($self->{_rw} || $self->{_eof}) { |
|
|
1318 | Scalar::Util::weaken $self; |
|
|
1319 | |
|
|
1320 | $self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
|
|
1321 | my $rbuf = \($self->{tls} ? my $buf : $self->{rbuf}); |
|
|
1322 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
|
|
1323 | |
|
|
1324 | if ($len > 0) { |
|
|
1325 | $self->{_activity} = AnyEvent->now; |
|
|
1326 | |
|
|
1327 | if ($self->{tls}) { |
|
|
1328 | Net::SSLeay::BIO_write ($self->{_rbio}, $$rbuf); |
|
|
1329 | |
|
|
1330 | &_dotls ($self); |
|
|
1331 | } else { |
|
|
1332 | $self->_drain_rbuf unless $self->{_in_drain}; |
|
|
1333 | } |
|
|
1334 | |
|
|
1335 | } elsif (defined $len) { |
|
|
1336 | delete $self->{_rw}; |
|
|
1337 | $self->{_eof} = 1; |
|
|
1338 | $self->_drain_rbuf unless $self->{_in_drain}; |
|
|
1339 | |
|
|
1340 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
|
|
1341 | return $self->_error ($!, 1); |
147 | } |
1342 | } |
148 | }); |
1343 | }); |
|
|
1344 | } |
149 | } |
1345 | } |
150 | |
1346 | |
151 | =item B<on_error ($callback)> |
1347 | # poll the write BIO and send the data if applicable |
152 | |
1348 | sub _dotls { |
153 | Whenever a read or write operation resulted in an error the C<$callback> |
|
|
154 | will be called. |
|
|
155 | |
|
|
156 | The first argument of C<$callback> will be the L<AnyEvent::Handle> object itself |
|
|
157 | and the second argument will be the value of C<$!>. |
|
|
158 | |
|
|
159 | =cut |
|
|
160 | |
|
|
161 | sub on_error { |
|
|
162 | $_[0]->{on_error} = $_[1]; |
|
|
163 | } |
|
|
164 | |
|
|
165 | =item B<on_eof ($callback)> |
|
|
166 | |
|
|
167 | Installs the C<$callback> that will be called when the end of file is |
|
|
168 | encountered in a read operation this C<$callback> will be called. The first |
|
|
169 | argument will be the L<AnyEvent::Handle> object itself. |
|
|
170 | |
|
|
171 | =cut |
|
|
172 | |
|
|
173 | sub on_eof { |
|
|
174 | $_[0]->{on_eof} = $_[1]; |
|
|
175 | } |
|
|
176 | |
|
|
177 | =item B<rbuf> |
|
|
178 | |
|
|
179 | Returns a reference to the read buffer. |
|
|
180 | |
|
|
181 | NOTE: The read buffer should only be used or modified if the C<on_read> |
|
|
182 | method is used directly. The C<read> and C<readlines> methods will provide |
|
|
183 | the read data to their callbacks. |
|
|
184 | |
|
|
185 | =cut |
|
|
186 | |
|
|
187 | sub rbuf : lvalue { $_[0]->{rbuf} } |
|
|
188 | |
|
|
189 | =item B<read ($len, $callback)> |
|
|
190 | |
|
|
191 | Will read exactly C<$len> bytes from the filehandle and call the C<$callback> |
|
|
192 | if done so. The first argument to the C<$callback> will be the L<AnyEvent::Handle> |
|
|
193 | object itself and the second argument the read data. |
|
|
194 | |
|
|
195 | NOTE: This method will override any callbacks installed via the C<on_read> method. |
|
|
196 | |
|
|
197 | =cut |
|
|
198 | |
|
|
199 | sub read { |
|
|
200 | my ($self, $len, $cb) = @_; |
1349 | my ($self) = @_; |
201 | |
1350 | |
202 | $self->{read_cb} = $cb; |
1351 | my $tmp; |
203 | my $old_blk_size = $self->{read_block_size}; |
|
|
204 | $self->{read_block_size} = $len; |
|
|
205 | |
1352 | |
206 | $self->on_read (sub { |
1353 | if (length $self->{_tls_wbuf}) { |
207 | #d# warn "OFOFO $len || ".length($_[0]->{rbuf})."||\n"; |
1354 | while (($tmp = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) { |
208 | |
1355 | substr $self->{_tls_wbuf}, 0, $tmp, ""; |
209 | if ($len == length $_[0]->{rbuf}) { |
|
|
210 | $_[0]->{read_block_size} = $old_blk_size; |
|
|
211 | $_[0]->on_read (undef); |
|
|
212 | $_[0]->{read_cb}->($_[0], (substr $self->{rbuf}, 0, $len, '')); |
|
|
213 | } |
1356 | } |
214 | }); |
1357 | } |
215 | } |
|
|
216 | |
1358 | |
217 | =item B<readlines ($callback)> |
1359 | while (defined ($tmp = Net::SSLeay::read ($self->{tls}))) { |
|
|
1360 | unless (length $tmp) { |
|
|
1361 | # let's treat SSL-eof as we treat normal EOF |
|
|
1362 | delete $self->{_rw}; |
|
|
1363 | $self->{_eof} = 1; |
|
|
1364 | &_freetls; |
|
|
1365 | } |
218 | |
1366 | |
219 | =item B<readlines ($sep, $callback)> |
1367 | $self->{_tls_rbuf} .= $tmp; |
|
|
1368 | $self->_drain_rbuf unless $self->{_in_drain}; |
|
|
1369 | $self->{tls} or return; # tls session might have gone away in callback |
|
|
1370 | } |
220 | |
1371 | |
221 | This method will read lines from the filehandle, seperated by C<$sep> or C<"\n"> |
1372 | $tmp = Net::SSLeay::get_error ($self->{tls}, -1); |
222 | if C<$sep> is not provided. C<$sep> will be used as part of a regex, so it can be |
|
|
223 | a regex itself and won't be quoted! |
|
|
224 | |
1373 | |
225 | The C<$callback> will be called when at least one |
1374 | if ($tmp != Net::SSLeay::ERROR_WANT_READ ()) { |
226 | line could be read. The first argument to the C<$callback> will be the L<AnyEvent::Handle> |
1375 | if ($tmp == Net::SSLeay::ERROR_SYSCALL ()) { |
227 | object itself and the rest of the arguments will be the read lines. |
1376 | return $self->_error ($!, 1); |
|
|
1377 | } elsif ($tmp == Net::SSLeay::ERROR_SSL ()) { |
|
|
1378 | return $self->_error (&Errno::EIO, 1); |
|
|
1379 | } |
228 | |
1380 | |
229 | NOTE: This method will override any callbacks installed via the C<on_read> method. |
1381 | # all other errors are fine for our purposes |
|
|
1382 | } |
230 | |
1383 | |
231 | =cut |
1384 | while (length ($tmp = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
|
|
1385 | $self->{wbuf} .= $tmp; |
|
|
1386 | $self->_drain_wbuf; |
|
|
1387 | } |
|
|
1388 | } |
232 | |
1389 | |
233 | sub readlines { |
1390 | =item $handle->starttls ($tls[, $tls_ctx]) |
|
|
1391 | |
|
|
1392 | Instead of starting TLS negotiation immediately when the AnyEvent::Handle |
|
|
1393 | object is created, you can also do that at a later time by calling |
|
|
1394 | C<starttls>. |
|
|
1395 | |
|
|
1396 | The first argument is the same as the C<tls> constructor argument (either |
|
|
1397 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
|
|
1398 | |
|
|
1399 | The second argument is the optional C<AnyEvent::TLS> object that is used |
|
|
1400 | when AnyEvent::Handle has to create its own TLS connection object, or |
|
|
1401 | a hash reference with C<< key => value >> pairs that will be used to |
|
|
1402 | construct a new context. |
|
|
1403 | |
|
|
1404 | The TLS connection object will end up in C<< $handle->{tls} >>, the TLS |
|
|
1405 | context in C<< $handle->{tls_ctx} >> after this call and can be used or |
|
|
1406 | changed to your liking. Note that the handshake might have already started |
|
|
1407 | when this function returns. |
|
|
1408 | |
|
|
1409 | If it an error to start a TLS handshake more than once per |
|
|
1410 | AnyEvent::Handle object (this is due to bugs in OpenSSL). |
|
|
1411 | |
|
|
1412 | =cut |
|
|
1413 | |
|
|
1414 | sub starttls { |
234 | my ($self, $NL, $cb) = @_; |
1415 | my ($self, $ssl, $ctx) = @_; |
235 | |
1416 | |
236 | if (ref $NL) { |
1417 | require Net::SSLeay; |
237 | $cb = $NL; |
1418 | |
238 | $NL = "\n"; |
1419 | Carp::croak "it is an error to call starttls more than once on an AnyEvent::Handle object" |
|
|
1420 | if $self->{tls}; |
|
|
1421 | |
|
|
1422 | $ctx ||= $self->{tls_ctx}; |
|
|
1423 | |
|
|
1424 | if ("HASH" eq ref $ctx) { |
|
|
1425 | require AnyEvent::TLS; |
|
|
1426 | |
|
|
1427 | local $Carp::CarpLevel = 1; # skip ourselves when creating a new context |
|
|
1428 | $ctx = new AnyEvent::TLS %$ctx; |
|
|
1429 | } |
239 | } |
1430 | |
|
|
1431 | $self->{tls_ctx} = $ctx || TLS_CTX (); |
|
|
1432 | $self->{tls} = $ssl = $self->{tls_ctx}->_get_session ($ssl, $self); |
240 | |
1433 | |
241 | $self->{on_readline} = $cb; |
1434 | # basically, this is deep magic (because SSL_read should have the same issues) |
|
|
1435 | # but the openssl maintainers basically said: "trust us, it just works". |
|
|
1436 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
|
|
1437 | # and mismaintained ssleay-module doesn't even offer them). |
|
|
1438 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
|
|
1439 | # |
|
|
1440 | # in short: this is a mess. |
|
|
1441 | # |
|
|
1442 | # note that we do not try to keep the length constant between writes as we are required to do. |
|
|
1443 | # we assume that most (but not all) of this insanity only applies to non-blocking cases, |
|
|
1444 | # and we drive openssl fully in blocking mode here. Or maybe we don't - openssl seems to |
|
|
1445 | # have identity issues in that area. |
|
|
1446 | # Net::SSLeay::CTX_set_mode ($ssl, |
|
|
1447 | # (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
|
|
1448 | # | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
|
|
1449 | Net::SSLeay::CTX_set_mode ($ssl, 1|2); |
242 | |
1450 | |
243 | $self->on_read (sub { |
1451 | $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
244 | my @lines; |
1452 | $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
245 | push @lines, $1 while $_[0]->{rbuf} =~ s/(.*)$NL//; |
|
|
246 | $self->{on_readline}->($_[0], @lines); |
|
|
247 | }); |
|
|
248 | } |
|
|
249 | |
1453 | |
250 | =item B<write ($data)> |
1454 | Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio}); |
251 | |
1455 | |
252 | =item B<write ($callback)> |
1456 | &_dotls; # need to trigger the initial handshake |
253 | |
1457 | $self->start_read; # make sure we actually do read |
254 | =item B<write ($data, $callback)> |
|
|
255 | |
|
|
256 | This method will write C<$data> to the filehandle and call the C<$callback> |
|
|
257 | afterwards. If only C<$callback> is provided it will be called when the |
|
|
258 | write buffer becomes empty the next time (or immediately if it already is empty). |
|
|
259 | |
|
|
260 | =cut |
|
|
261 | |
|
|
262 | sub write { |
|
|
263 | my ($self, $data, $cb) = @_; |
|
|
264 | if (ref $data) { $cb = $data; undef $data } |
|
|
265 | push @{$self->{write_bufs}}, [$data, $cb]; |
|
|
266 | $self->_check_writer; |
|
|
267 | } |
1458 | } |
268 | |
1459 | |
269 | sub _check_writer { |
1460 | =item $handle->stoptls |
|
|
1461 | |
|
|
1462 | Shuts down the SSL connection - this makes a proper EOF handshake by |
|
|
1463 | sending a close notify to the other side, but since OpenSSL doesn't |
|
|
1464 | support non-blocking shut downs, it is not possible to re-use the stream |
|
|
1465 | afterwards. |
|
|
1466 | |
|
|
1467 | =cut |
|
|
1468 | |
|
|
1469 | sub stoptls { |
270 | my ($self) = @_; |
1470 | my ($self) = @_; |
271 | |
1471 | |
272 | if ($self->{write_w}) { |
1472 | if ($self->{tls}) { |
273 | unless ($self->{write_cb}) { |
1473 | Net::SSLeay::shutdown ($self->{tls}); |
274 | while (@{$self->{write_bufs}} && not defined $self->{write_bufs}->[0]->[1]) { |
1474 | |
275 | my $wba = shift @{$self->{write_bufs}}; |
1475 | &_dotls; |
276 | $self->{wbuf} .= $wba->[0]; |
1476 | |
277 | } |
1477 | # we don't give a shit. no, we do, but we can't. no... |
278 | } |
1478 | # we, we... have to use openssl :/ |
279 | return; |
1479 | &_freetls; |
|
|
1480 | } |
|
|
1481 | } |
|
|
1482 | |
|
|
1483 | sub _freetls { |
|
|
1484 | my ($self) = @_; |
|
|
1485 | |
|
|
1486 | return unless $self->{tls}; |
|
|
1487 | |
|
|
1488 | $self->{tls_ctx}->_put_session (delete $self->{tls}); |
280 | } |
1489 | |
|
|
1490 | delete @$self{qw(_rbio _wbio _tls_wbuf)}; |
|
|
1491 | } |
281 | |
1492 | |
282 | my $wba = shift @{$self->{write_bufs}} |
1493 | sub DESTROY { |
283 | or return; |
1494 | my ($self) = @_; |
284 | |
1495 | |
285 | unless (defined $wba->[0]) { |
1496 | &_freetls; |
286 | $wba->[1]->($self) if $wba->[1]; |
|
|
287 | $self->_check_writer; |
|
|
288 | return; |
|
|
289 | } |
|
|
290 | |
1497 | |
291 | $self->{wbuf} = $wba->[0]; |
1498 | my $linger = exists $self->{linger} ? $self->{linger} : 3600; |
292 | $self->{write_cb} = $wba->[1]; |
|
|
293 | |
1499 | |
294 | $self->{write_w} = |
1500 | if ($linger && length $self->{wbuf}) { |
295 | AnyEvent->io (poll => 'w', fh => $self->{fh}, cb => sub { |
1501 | my $fh = delete $self->{fh}; |
|
|
1502 | my $wbuf = delete $self->{wbuf}; |
|
|
1503 | |
|
|
1504 | my @linger; |
|
|
1505 | |
|
|
1506 | push @linger, AnyEvent->io (fh => $fh, poll => "w", cb => sub { |
296 | my $l = syswrite $self->{fh}, $self->{wbuf}, length $self->{wbuf}; |
1507 | my $len = syswrite $fh, $wbuf, length $wbuf; |
297 | |
1508 | |
298 | if (not defined $l) { |
1509 | if ($len > 0) { |
299 | return if $! == EAGAIN || $! == EINTR; |
1510 | substr $wbuf, 0, $len, ""; |
300 | delete $self->{write_w}; |
|
|
301 | |
|
|
302 | $self->{on_error}->($self, $!) if $self->{on_error}; |
|
|
303 | |
|
|
304 | } else { |
1511 | } else { |
305 | substr $self->{wbuf}, 0, $l, ''; |
1512 | @linger = (); # end |
306 | |
|
|
307 | if (length ($self->{wbuf}) == 0) { |
|
|
308 | $self->{write_cb}->($self) if $self->{write_cb}; |
|
|
309 | |
|
|
310 | delete $self->{write_w}; |
|
|
311 | delete $self->{wbuf}; |
|
|
312 | delete $self->{write_cb}; |
|
|
313 | |
|
|
314 | $self->_check_writer; |
|
|
315 | } |
|
|
316 | } |
1513 | } |
317 | }); |
1514 | }); |
|
|
1515 | push @linger, AnyEvent->timer (after => $linger, cb => sub { |
|
|
1516 | @linger = (); |
|
|
1517 | }); |
|
|
1518 | } |
|
|
1519 | } |
|
|
1520 | |
|
|
1521 | =item $handle->destroy |
|
|
1522 | |
|
|
1523 | Shuts down the handle object as much as possible - this call ensures that |
|
|
1524 | no further callbacks will be invoked and resources will be freed as much |
|
|
1525 | as possible. You must not call any methods on the object afterwards. |
|
|
1526 | |
|
|
1527 | Normally, you can just "forget" any references to an AnyEvent::Handle |
|
|
1528 | object and it will simply shut down. This works in fatal error and EOF |
|
|
1529 | callbacks, as well as code outside. It does I<NOT> work in a read or write |
|
|
1530 | callback, so when you want to destroy the AnyEvent::Handle object from |
|
|
1531 | within such an callback. You I<MUST> call C<< ->destroy >> explicitly in |
|
|
1532 | that case. |
|
|
1533 | |
|
|
1534 | The handle might still linger in the background and write out remaining |
|
|
1535 | data, as specified by the C<linger> option, however. |
|
|
1536 | |
|
|
1537 | =cut |
|
|
1538 | |
|
|
1539 | sub destroy { |
|
|
1540 | my ($self) = @_; |
|
|
1541 | |
|
|
1542 | $self->DESTROY; |
|
|
1543 | %$self = (); |
|
|
1544 | } |
|
|
1545 | |
|
|
1546 | =item AnyEvent::Handle::TLS_CTX |
|
|
1547 | |
|
|
1548 | This function creates and returns the AnyEvent::TLS object used by default |
|
|
1549 | for TLS mode. |
|
|
1550 | |
|
|
1551 | The context is created by calling L<AnyEvent::TLS> without any arguments. |
|
|
1552 | |
|
|
1553 | =cut |
|
|
1554 | |
|
|
1555 | our $TLS_CTX; |
|
|
1556 | |
|
|
1557 | sub TLS_CTX() { |
|
|
1558 | $TLS_CTX ||= do { |
|
|
1559 | require AnyEvent::TLS; |
|
|
1560 | |
|
|
1561 | new AnyEvent::TLS |
|
|
1562 | } |
318 | } |
1563 | } |
319 | |
1564 | |
320 | =back |
1565 | =back |
321 | |
1566 | |
|
|
1567 | |
|
|
1568 | =head1 NONFREQUENTLY ASKED QUESTIONS |
|
|
1569 | |
|
|
1570 | =over 4 |
|
|
1571 | |
|
|
1572 | =item I C<undef> the AnyEvent::Handle reference inside my callback and |
|
|
1573 | still get further invocations! |
|
|
1574 | |
|
|
1575 | That's because AnyEvent::Handle keeps a reference to itself when handling |
|
|
1576 | read or write callbacks. |
|
|
1577 | |
|
|
1578 | It is only safe to "forget" the reference inside EOF or error callbacks, |
|
|
1579 | from within all other callbacks, you need to explicitly call the C<< |
|
|
1580 | ->destroy >> method. |
|
|
1581 | |
|
|
1582 | =item I get different callback invocations in TLS mode/Why can't I pause |
|
|
1583 | reading? |
|
|
1584 | |
|
|
1585 | Unlike, say, TCP, TLS connections do not consist of two independent |
|
|
1586 | communication channels, one for each direction. Or put differently. The |
|
|
1587 | read and write directions are not independent of each other: you cannot |
|
|
1588 | write data unless you are also prepared to read, and vice versa. |
|
|
1589 | |
|
|
1590 | This can mean than, in TLS mode, you might get C<on_error> or C<on_eof> |
|
|
1591 | callback invocations when you are not expecting any read data - the reason |
|
|
1592 | is that AnyEvent::Handle always reads in TLS mode. |
|
|
1593 | |
|
|
1594 | During the connection, you have to make sure that you always have a |
|
|
1595 | non-empty read-queue, or an C<on_read> watcher. At the end of the |
|
|
1596 | connection (or when you no longer want to use it) you can call the |
|
|
1597 | C<destroy> method. |
|
|
1598 | |
|
|
1599 | =item How do I read data until the other side closes the connection? |
|
|
1600 | |
|
|
1601 | If you just want to read your data into a perl scalar, the easiest way |
|
|
1602 | to achieve this is by setting an C<on_read> callback that does nothing, |
|
|
1603 | clearing the C<on_eof> callback and in the C<on_error> callback, the data |
|
|
1604 | will be in C<$_[0]{rbuf}>: |
|
|
1605 | |
|
|
1606 | $handle->on_read (sub { }); |
|
|
1607 | $handle->on_eof (undef); |
|
|
1608 | $handle->on_error (sub { |
|
|
1609 | my $data = delete $_[0]{rbuf}; |
|
|
1610 | undef $handle; |
|
|
1611 | }); |
|
|
1612 | |
|
|
1613 | The reason to use C<on_error> is that TCP connections, due to latencies |
|
|
1614 | and packets loss, might get closed quite violently with an error, when in |
|
|
1615 | fact, all data has been received. |
|
|
1616 | |
|
|
1617 | It is usually better to use acknowledgements when transferring data, |
|
|
1618 | to make sure the other side hasn't just died and you got the data |
|
|
1619 | intact. This is also one reason why so many internet protocols have an |
|
|
1620 | explicit QUIT command. |
|
|
1621 | |
|
|
1622 | =item I don't want to destroy the handle too early - how do I wait until |
|
|
1623 | all data has been written? |
|
|
1624 | |
|
|
1625 | After writing your last bits of data, set the C<on_drain> callback |
|
|
1626 | and destroy the handle in there - with the default setting of |
|
|
1627 | C<low_water_mark> this will be called precisely when all data has been |
|
|
1628 | written to the socket: |
|
|
1629 | |
|
|
1630 | $handle->push_write (...); |
|
|
1631 | $handle->on_drain (sub { |
|
|
1632 | warn "all data submitted to the kernel\n"; |
|
|
1633 | undef $handle; |
|
|
1634 | }); |
|
|
1635 | |
|
|
1636 | =back |
|
|
1637 | |
|
|
1638 | |
|
|
1639 | =head1 SUBCLASSING AnyEvent::Handle |
|
|
1640 | |
|
|
1641 | In many cases, you might want to subclass AnyEvent::Handle. |
|
|
1642 | |
|
|
1643 | To make this easier, a given version of AnyEvent::Handle uses these |
|
|
1644 | conventions: |
|
|
1645 | |
|
|
1646 | =over 4 |
|
|
1647 | |
|
|
1648 | =item * all constructor arguments become object members. |
|
|
1649 | |
|
|
1650 | At least initially, when you pass a C<tls>-argument to the constructor it |
|
|
1651 | will end up in C<< $handle->{tls} >>. Those members might be changed or |
|
|
1652 | mutated later on (for example C<tls> will hold the TLS connection object). |
|
|
1653 | |
|
|
1654 | =item * other object member names are prefixed with an C<_>. |
|
|
1655 | |
|
|
1656 | All object members not explicitly documented (internal use) are prefixed |
|
|
1657 | with an underscore character, so the remaining non-C<_>-namespace is free |
|
|
1658 | for use for subclasses. |
|
|
1659 | |
|
|
1660 | =item * all members not documented here and not prefixed with an underscore |
|
|
1661 | are free to use in subclasses. |
|
|
1662 | |
|
|
1663 | Of course, new versions of AnyEvent::Handle may introduce more "public" |
|
|
1664 | member variables, but thats just life, at least it is documented. |
|
|
1665 | |
|
|
1666 | =back |
|
|
1667 | |
322 | =head1 AUTHOR |
1668 | =head1 AUTHOR |
323 | |
1669 | |
324 | Robin Redeker, C<< <elmex at ta-sa.org> >> |
1670 | Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>. |
325 | |
|
|
326 | =head1 BUGS |
|
|
327 | |
|
|
328 | Please report any bugs or feature requests to |
|
|
329 | C<bug-io-anyevent at rt.cpan.org>, or through the web interface at |
|
|
330 | L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=IO-AnyEvent>. |
|
|
331 | I will be notified, and then you'll automatically be notified of progress on |
|
|
332 | your bug as I make changes. |
|
|
333 | |
|
|
334 | =head1 SUPPORT |
|
|
335 | |
|
|
336 | You can find documentation for this module with the perldoc command. |
|
|
337 | |
|
|
338 | perldoc AnyEvent::Handle |
|
|
339 | |
|
|
340 | You can also look for information at: |
|
|
341 | |
|
|
342 | =over 4 |
|
|
343 | |
|
|
344 | =item * AnnoCPAN: Annotated CPAN documentation |
|
|
345 | |
|
|
346 | L<http://annocpan.org/dist/IO-AnyEvent> |
|
|
347 | |
|
|
348 | =item * CPAN Ratings |
|
|
349 | |
|
|
350 | L<http://cpanratings.perl.org/d/IO-AnyEvent> |
|
|
351 | |
|
|
352 | =item * RT: CPAN's request tracker |
|
|
353 | |
|
|
354 | L<http://rt.cpan.org/NoAuth/Bugs.html?Dist=IO-AnyEvent> |
|
|
355 | |
|
|
356 | =item * Search CPAN |
|
|
357 | |
|
|
358 | L<http://search.cpan.org/dist/IO-AnyEvent> |
|
|
359 | |
|
|
360 | =back |
|
|
361 | |
|
|
362 | =head1 ACKNOWLEDGEMENTS |
|
|
363 | |
|
|
364 | =head1 COPYRIGHT & LICENSE |
|
|
365 | |
|
|
366 | Copyright 2008 Robin Redeker, all rights reserved. |
|
|
367 | |
|
|
368 | This program is free software; you can redistribute it and/or modify it |
|
|
369 | under the same terms as Perl itself. |
|
|
370 | |
1671 | |
371 | =cut |
1672 | =cut |
372 | |
1673 | |
373 | 1; # End of AnyEvent::Handle |
1674 | 1; # End of AnyEvent::Handle |