1 | package AnyEvent::Handle; |
1 | package AnyEvent::Handle; |
2 | |
2 | |
3 | no warnings; |
3 | no warnings; |
4 | use strict; |
4 | use strict; |
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 = '0.04'; |
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 = |
30 | |
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31 | $ae_fh->on_eof (sub { $cv->broadcast }); |
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32 | |
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33 | $ae_fh->readlines (sub { |
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34 | my ($ae_fh, @lines) = @_; |
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35 | for (@lines) { |
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36 | chomp; |
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37 | print "Line: $_"; |
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38 | } |
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39 | }); |
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40 | |
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41 | # or use the constructor to pass the callback: |
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42 | |
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43 | my $ae_fh2 = |
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44 | AnyEvent::Handle->new ( |
29 | AnyEvent::Handle->new ( |
45 | fh => \*STDIN, |
30 | fh => \*STDIN, |
46 | on_eof => sub { |
31 | on_eof => sub { |
47 | $cv->broadcast; |
32 | $cv->broadcast; |
48 | }, |
33 | }, |
49 | on_readline => sub { |
34 | ); |
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35 | |
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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 | $handle->push_read (line => sub { |
50 | my ($ae_fh, @lines) = @_; |
41 | my ($handle, $line) = @_; |
51 | for (@lines) { |
42 | warn "read line <$line>\n"; |
52 | chomp; |
43 | $cv->send; |
53 | 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 | In the following, when the documentation refers to of "bytes" then this |
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55 | means characters. As sysread and syswrite are used for all I/O, their |
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56 | treatment of characters applies to this module as well. |
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57 | |
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58 | All callbacks will be invoked with the handle object as their first |
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59 | argument. |
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60 | |
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61 | =head1 METHODS |
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62 | |
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63 | =over 4 |
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64 | |
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65 | =item B<new (%args)> |
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66 | |
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67 | The constructor supports these arguments (all as key => value pairs). |
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68 | |
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69 | =over 4 |
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70 | |
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71 | =item fh => $filehandle [MANDATORY] |
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72 | |
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73 | The filehandle this L<AnyEvent::Handle> object will operate on. |
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74 | |
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75 | NOTE: The filehandle will be set to non-blocking (using |
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76 | AnyEvent::Util::fh_nonblocking). |
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77 | |
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78 | =item on_eof => $cb->($handle) |
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79 | |
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80 | Set the callback to be called on EOF. |
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81 | |
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82 | While not mandatory, it is highly recommended to set an eof callback, |
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83 | otherwise you might end up with a closed socket while you are still |
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84 | waiting for data. |
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85 | |
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86 | =item on_error => $cb->($handle) |
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87 | |
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88 | This is the fatal error callback, that is called when, well, a fatal error |
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89 | occurs, such as not being able to resolve the hostname, failure to connect |
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90 | or a read error. |
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91 | |
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92 | The object will not be in a usable state when this callback has been |
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93 | called. |
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94 | |
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95 | On callback entrance, the value of C<$!> contains the operating system |
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96 | error (or C<ENOSPC>, C<EPIPE>, C<ETIMEDOUT> or C<EBADMSG>). |
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97 | |
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98 | The callback should throw an exception. If it returns, then |
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99 | AnyEvent::Handle will C<croak> for you. |
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100 | |
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101 | While not mandatory, it is I<highly> recommended to set this callback, as |
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102 | you will not be notified of errors otherwise. The default simply calls |
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103 | die. |
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104 | |
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105 | =item on_read => $cb->($handle) |
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106 | |
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107 | This sets the default read callback, which is called when data arrives |
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108 | and no read request is in the queue. |
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109 | |
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110 | To access (and remove data from) the read buffer, use the C<< ->rbuf >> |
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111 | method or access the C<$handle->{rbuf}> member directly. |
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112 | |
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113 | When an EOF condition is detected then AnyEvent::Handle will first try to |
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114 | feed all the remaining data to the queued callbacks and C<on_read> before |
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115 | calling the C<on_eof> callback. If no progress can be made, then a fatal |
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116 | error will be raised (with C<$!> set to C<EPIPE>). |
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117 | |
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118 | =item on_drain => $cb->($handle) |
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119 | |
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120 | This sets the callback that is called when the write buffer becomes empty |
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121 | (or when the callback is set and the buffer is empty already). |
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122 | |
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123 | To append to the write buffer, use the C<< ->push_write >> method. |
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124 | |
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125 | =item timeout => $fractional_seconds |
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126 | |
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127 | If non-zero, then this enables an "inactivity" timeout: whenever this many |
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128 | seconds pass without a successful read or write on the underlying file |
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129 | handle, the C<on_timeout> callback will be invoked (and if that one is |
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130 | missing, an C<ETIMEDOUT> error will be raised). |
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131 | |
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132 | Note that timeout processing is also active when you currently do not have |
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133 | any outstanding read or write requests: If you plan to keep the connection |
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134 | idle then you should disable the timout temporarily or ignore the timeout |
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135 | in the C<on_timeout> callback. |
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136 | |
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137 | Zero (the default) disables this timeout. |
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138 | |
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139 | =item on_timeout => $cb->($handle) |
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140 | |
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141 | Called whenever the inactivity timeout passes. If you return from this |
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142 | callback, then the timeout will be reset as if some activity had happened, |
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143 | so this condition is not fatal in any way. |
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144 | |
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145 | =item rbuf_max => <bytes> |
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146 | |
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147 | If defined, then a fatal error will be raised (with C<$!> set to C<ENOSPC>) |
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148 | when the read buffer ever (strictly) exceeds this size. This is useful to |
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149 | avoid denial-of-service attacks. |
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150 | |
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151 | For example, a server accepting connections from untrusted sources should |
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152 | be configured to accept only so-and-so much data that it cannot act on |
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153 | (for example, when expecting a line, an attacker could send an unlimited |
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154 | amount of data without a callback ever being called as long as the line |
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155 | isn't finished). |
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156 | |
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157 | =item read_size => <bytes> |
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158 | |
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159 | The default read block size (the amount of bytes this module will try to read |
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160 | during each (loop iteration). Default: C<8192>. |
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161 | |
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162 | =item low_water_mark => <bytes> |
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163 | |
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164 | Sets the amount of bytes (default: C<0>) that make up an "empty" write |
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165 | buffer: If the write reaches this size or gets even samller it is |
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166 | considered empty. |
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167 | |
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168 | =item tls => "accept" | "connect" | Net::SSLeay::SSL object |
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169 | |
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170 | When this parameter is given, it enables TLS (SSL) mode, that means it |
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171 | will start making tls handshake and will transparently encrypt/decrypt |
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172 | data. |
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173 | |
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174 | TLS mode requires Net::SSLeay to be installed (it will be loaded |
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175 | automatically when you try to create a TLS handle). |
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176 | |
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177 | For the TLS server side, use C<accept>, and for the TLS client side of a |
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178 | connection, use C<connect> mode. |
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179 | |
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180 | You can also provide your own TLS connection object, but you have |
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181 | to make sure that you call either C<Net::SSLeay::set_connect_state> |
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182 | or C<Net::SSLeay::set_accept_state> on it before you pass it to |
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183 | AnyEvent::Handle. |
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184 | |
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185 | See the C<starttls> method if you need to start TLs negotiation later. |
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186 | |
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187 | =item tls_ctx => $ssl_ctx |
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188 | |
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189 | Use the given Net::SSLeay::CTX object to create the new TLS connection |
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190 | (unless a connection object was specified directly). If this parameter is |
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191 | missing, then AnyEvent::Handle will use C<AnyEvent::Handle::TLS_CTX>. |
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192 | |
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193 | =item json => JSON or JSON::XS object |
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194 | |
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195 | This is the json coder object used by the C<json> read and write types. |
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196 | |
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197 | If you don't supply it, then AnyEvent::Handle will create and use a |
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198 | suitable one, which will write and expect UTF-8 encoded JSON texts. |
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199 | |
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200 | Note that you are responsible to depend on the JSON module if you want to |
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201 | use this functionality, as AnyEvent does not have a dependency itself. |
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202 | |
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203 | =item filter_r => $cb |
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204 | |
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205 | =item filter_w => $cb |
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206 | |
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207 | These exist, but are undocumented at this time. |
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208 | |
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209 | =back |
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210 | |
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211 | =cut |
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212 | |
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213 | sub new { |
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214 | my $class = shift; |
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215 | |
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216 | my $self = bless { @_ }, $class; |
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217 | |
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218 | $self->{fh} or Carp::croak "mandatory argument fh is missing"; |
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219 | |
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220 | AnyEvent::Util::fh_nonblocking $self->{fh}, 1; |
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221 | |
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222 | if ($self->{tls}) { |
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223 | require Net::SSLeay; |
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224 | $self->starttls (delete $self->{tls}, delete $self->{tls_ctx}); |
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225 | } |
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226 | |
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227 | # $self->on_eof (delete $self->{on_eof} ) if $self->{on_eof}; # nop |
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228 | # $self->on_error (delete $self->{on_error}) if $self->{on_error}; # nop |
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229 | # $self->on_read (delete $self->{on_read} ) if $self->{on_read}; # nop |
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230 | $self->on_drain (delete $self->{on_drain}) if $self->{on_drain}; |
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231 | |
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232 | $self->{_activity} = AnyEvent->now; |
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233 | $self->_timeout; |
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234 | |
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235 | $self->start_read; |
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236 | |
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237 | $self |
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238 | } |
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239 | |
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240 | sub _shutdown { |
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241 | my ($self) = @_; |
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242 | |
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243 | delete $self->{_tw}; |
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244 | delete $self->{_rw}; |
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245 | delete $self->{_ww}; |
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246 | delete $self->{fh}; |
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247 | } |
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248 | |
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249 | sub error { |
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250 | my ($self) = @_; |
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251 | |
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252 | { |
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253 | local $!; |
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254 | $self->_shutdown; |
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255 | } |
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256 | |
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257 | $self->{on_error}($self) |
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258 | if $self->{on_error}; |
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259 | |
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260 | Carp::croak "AnyEvent::Handle uncaught fatal error: $!"; |
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261 | } |
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262 | |
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263 | =item $fh = $handle->fh |
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264 | |
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265 | This method returns the file handle of the L<AnyEvent::Handle> object. |
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266 | |
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267 | =cut |
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268 | |
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269 | sub fh { $_[0]{fh} } |
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270 | |
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271 | =item $handle->on_error ($cb) |
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272 | |
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273 | Replace the current C<on_error> callback (see the C<on_error> constructor argument). |
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274 | |
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275 | =cut |
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276 | |
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277 | sub on_error { |
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278 | $_[0]{on_error} = $_[1]; |
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279 | } |
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280 | |
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281 | =item $handle->on_eof ($cb) |
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282 | |
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283 | Replace the current C<on_eof> callback (see the C<on_eof> constructor argument). |
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284 | |
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285 | =cut |
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286 | |
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287 | sub on_eof { |
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288 | $_[0]{on_eof} = $_[1]; |
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289 | } |
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290 | |
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291 | =item $handle->on_timeout ($cb) |
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292 | |
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293 | Replace the current C<on_timeout> callback, or disables the callback |
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294 | (but not the timeout) if C<$cb> = C<undef>. See C<timeout> constructor |
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295 | argument. |
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296 | |
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297 | =cut |
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298 | |
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299 | sub on_timeout { |
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300 | $_[0]{on_timeout} = $_[1]; |
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301 | } |
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302 | |
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303 | ############################################################################# |
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304 | |
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305 | =item $handle->timeout ($seconds) |
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306 | |
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307 | Configures (or disables) the inactivity timeout. |
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308 | |
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309 | =cut |
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310 | |
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311 | sub timeout { |
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312 | my ($self, $timeout) = @_; |
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313 | |
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314 | $self->{timeout} = $timeout; |
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315 | $self->_timeout; |
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316 | } |
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317 | |
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318 | # reset the timeout watcher, as neccessary |
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319 | # also check for time-outs |
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320 | sub _timeout { |
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321 | my ($self) = @_; |
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322 | |
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323 | if ($self->{timeout}) { |
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324 | my $NOW = AnyEvent->now; |
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325 | |
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326 | # when would the timeout trigger? |
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327 | my $after = $self->{_activity} + $self->{timeout} - $NOW; |
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328 | |
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329 | # now or in the past already? |
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330 | if ($after <= 0) { |
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331 | $self->{_activity} = $NOW; |
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332 | |
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333 | if ($self->{on_timeout}) { |
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334 | $self->{on_timeout}->($self); |
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335 | } else { |
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336 | $! = Errno::ETIMEDOUT; |
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337 | $self->error; |
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338 | } |
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339 | |
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340 | # callbakx could have changed timeout value, optimise |
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341 | return unless $self->{timeout}; |
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342 | |
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343 | # calculate new after |
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344 | $after = $self->{timeout}; |
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345 | } |
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346 | |
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347 | Scalar::Util::weaken $self; |
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348 | |
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349 | $self->{_tw} ||= AnyEvent->timer (after => $after, cb => sub { |
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350 | delete $self->{_tw}; |
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351 | $self->_timeout; |
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352 | }); |
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353 | } else { |
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354 | delete $self->{_tw}; |
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355 | } |
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356 | } |
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357 | |
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358 | ############################################################################# |
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359 | |
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360 | =back |
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361 | |
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362 | =head2 WRITE QUEUE |
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363 | |
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364 | AnyEvent::Handle manages two queues per handle, one for writing and one |
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365 | for reading. |
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366 | |
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367 | The write queue is very simple: you can add data to its end, and |
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368 | AnyEvent::Handle will automatically try to get rid of it for you. |
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369 | |
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370 | When data could be written and the write buffer is shorter then the low |
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371 | water mark, the C<on_drain> callback will be invoked. |
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372 | |
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373 | =over 4 |
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374 | |
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375 | =item $handle->on_drain ($cb) |
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376 | |
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377 | Sets the C<on_drain> callback or clears it (see the description of |
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378 | C<on_drain> in the constructor). |
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379 | |
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380 | =cut |
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381 | |
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382 | sub on_drain { |
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383 | my ($self, $cb) = @_; |
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384 | |
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385 | $self->{on_drain} = $cb; |
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386 | |
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387 | $cb->($self) |
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388 | if $cb && $self->{low_water_mark} >= length $self->{wbuf}; |
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389 | } |
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390 | |
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391 | =item $handle->push_write ($data) |
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392 | |
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393 | Queues the given scalar to be written. You can push as much data as you |
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394 | want (only limited by the available memory), as C<AnyEvent::Handle> |
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395 | buffers it independently of the kernel. |
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396 | |
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397 | =cut |
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398 | |
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399 | sub _drain_wbuf { |
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400 | my ($self) = @_; |
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401 | |
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402 | if (!$self->{_ww} && length $self->{wbuf}) { |
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403 | |
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404 | Scalar::Util::weaken $self; |
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405 | |
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406 | my $cb = sub { |
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407 | my $len = syswrite $self->{fh}, $self->{wbuf}; |
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408 | |
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409 | if ($len >= 0) { |
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410 | substr $self->{wbuf}, 0, $len, ""; |
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411 | |
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412 | $self->{_activity} = AnyEvent->now; |
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413 | |
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414 | $self->{on_drain}($self) |
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415 | if $self->{low_water_mark} >= length $self->{wbuf} |
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416 | && $self->{on_drain}; |
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417 | |
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418 | delete $self->{_ww} unless length $self->{wbuf}; |
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419 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
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420 | $self->error; |
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421 | } |
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422 | }; |
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423 | |
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424 | # try to write data immediately |
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425 | $cb->(); |
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426 | |
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427 | # if still data left in wbuf, we need to poll |
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428 | $self->{_ww} = AnyEvent->io (fh => $self->{fh}, poll => "w", cb => $cb) |
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429 | if length $self->{wbuf}; |
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430 | }; |
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431 | } |
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432 | |
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433 | our %WH; |
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434 | |
|
|
435 | sub register_write_type($$) { |
|
|
436 | $WH{$_[0]} = $_[1]; |
|
|
437 | } |
|
|
438 | |
|
|
439 | sub push_write { |
|
|
440 | my $self = shift; |
|
|
441 | |
|
|
442 | if (@_ > 1) { |
|
|
443 | my $type = shift; |
|
|
444 | |
|
|
445 | @_ = ($WH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_write") |
|
|
446 | ->($self, @_); |
|
|
447 | } |
|
|
448 | |
|
|
449 | if ($self->{filter_w}) { |
|
|
450 | $self->{filter_w}->($self, \$_[0]); |
|
|
451 | } else { |
|
|
452 | $self->{wbuf} .= $_[0]; |
|
|
453 | $self->_drain_wbuf; |
|
|
454 | } |
|
|
455 | } |
|
|
456 | |
|
|
457 | =item $handle->push_write (type => @args) |
|
|
458 | |
|
|
459 | =item $handle->unshift_write (type => @args) |
|
|
460 | |
|
|
461 | Instead of formatting your data yourself, you can also let this module do |
|
|
462 | the job by specifying a type and type-specific arguments. |
|
|
463 | |
|
|
464 | Predefined types are (if you have ideas for additional types, feel free to |
|
|
465 | drop by and tell us): |
|
|
466 | |
|
|
467 | =over 4 |
|
|
468 | |
|
|
469 | =item netstring => $string |
|
|
470 | |
|
|
471 | Formats the given value as netstring |
|
|
472 | (http://cr.yp.to/proto/netstrings.txt, this is not a recommendation to use them). |
|
|
473 | |
|
|
474 | =back |
|
|
475 | |
|
|
476 | =cut |
|
|
477 | |
|
|
478 | register_write_type netstring => sub { |
|
|
479 | my ($self, $string) = @_; |
|
|
480 | |
|
|
481 | sprintf "%d:%s,", (length $string), $string |
|
|
482 | }; |
|
|
483 | |
|
|
484 | =item json => $array_or_hashref |
|
|
485 | |
|
|
486 | Encodes the given hash or array reference into a JSON object. Unless you |
|
|
487 | provide your own JSON object, this means it will be encoded to JSON text |
|
|
488 | in UTF-8. |
|
|
489 | |
|
|
490 | JSON objects (and arrays) are self-delimiting, so you can write JSON at |
|
|
491 | one end of a handle and read them at the other end without using any |
|
|
492 | additional framing. |
|
|
493 | |
|
|
494 | The generated JSON text is guaranteed not to contain any newlines: While |
|
|
495 | this module doesn't need delimiters after or between JSON texts to be |
|
|
496 | able to read them, many other languages depend on that. |
|
|
497 | |
|
|
498 | A simple RPC protocol that interoperates easily with others is to send |
|
|
499 | JSON arrays (or objects, although arrays are usually the better choice as |
|
|
500 | they mimic how function argument passing works) and a newline after each |
|
|
501 | JSON text: |
|
|
502 | |
|
|
503 | $handle->push_write (json => ["method", "arg1", "arg2"]); # whatever |
|
|
504 | $handle->push_write ("\012"); |
|
|
505 | |
|
|
506 | An AnyEvent::Handle receiver would simply use the C<json> read type and |
|
|
507 | rely on the fact that the newline will be skipped as leading whitespace: |
|
|
508 | |
|
|
509 | $handle->push_read (json => sub { my $array = $_[1]; ... }); |
|
|
510 | |
|
|
511 | Other languages could read single lines terminated by a newline and pass |
|
|
512 | this line into their JSON decoder of choice. |
|
|
513 | |
|
|
514 | =cut |
|
|
515 | |
|
|
516 | register_write_type json => sub { |
|
|
517 | my ($self, $ref) = @_; |
|
|
518 | |
|
|
519 | require JSON; |
|
|
520 | |
|
|
521 | $self->{json} ? $self->{json}->encode ($ref) |
|
|
522 | : JSON::encode_json ($ref) |
|
|
523 | }; |
|
|
524 | |
|
|
525 | =item AnyEvent::Handle::register_write_type type => $coderef->($handle, @args) |
|
|
526 | |
|
|
527 | This function (not method) lets you add your own types to C<push_write>. |
|
|
528 | Whenever the given C<type> is used, C<push_write> will invoke the code |
|
|
529 | reference with the handle object and the remaining arguments. |
|
|
530 | |
|
|
531 | The code reference is supposed to return a single octet string that will |
|
|
532 | be appended to the write buffer. |
|
|
533 | |
|
|
534 | Note that this is a function, and all types registered this way will be |
|
|
535 | global, so try to use unique names. |
|
|
536 | |
|
|
537 | =cut |
|
|
538 | |
|
|
539 | ############################################################################# |
|
|
540 | |
|
|
541 | =back |
|
|
542 | |
|
|
543 | =head2 READ QUEUE |
|
|
544 | |
|
|
545 | AnyEvent::Handle manages two queues per handle, one for writing and one |
|
|
546 | for reading. |
|
|
547 | |
|
|
548 | The read queue is more complex than the write queue. It can be used in two |
|
|
549 | ways, the "simple" way, using only C<on_read> and the "complex" way, using |
|
|
550 | a queue. |
|
|
551 | |
|
|
552 | In the simple case, you just install an C<on_read> callback and whenever |
|
|
553 | new data arrives, it will be called. You can then remove some data (if |
|
|
554 | enough is there) from the read buffer (C<< $handle->rbuf >>) if you want |
|
|
555 | or not. |
|
|
556 | |
|
|
557 | In the more complex case, you want to queue multiple callbacks. In this |
|
|
558 | case, AnyEvent::Handle will call the first queued callback each time new |
|
|
559 | data arrives and removes it when it has done its job (see C<push_read>, |
|
|
560 | below). |
|
|
561 | |
|
|
562 | This way you can, for example, push three line-reads, followed by reading |
|
|
563 | a chunk of data, and AnyEvent::Handle will execute them in order. |
|
|
564 | |
|
|
565 | Example 1: EPP protocol parser. EPP sends 4 byte length info, followed by |
|
|
566 | the specified number of bytes which give an XML datagram. |
|
|
567 | |
|
|
568 | # in the default state, expect some header bytes |
|
|
569 | $handle->on_read (sub { |
|
|
570 | # some data is here, now queue the length-header-read (4 octets) |
|
|
571 | shift->unshift_read_chunk (4, sub { |
|
|
572 | # header arrived, decode |
|
|
573 | my $len = unpack "N", $_[1]; |
|
|
574 | |
|
|
575 | # now read the payload |
|
|
576 | shift->unshift_read_chunk ($len, sub { |
|
|
577 | my $xml = $_[1]; |
|
|
578 | # handle xml |
|
|
579 | }); |
|
|
580 | }); |
|
|
581 | }); |
|
|
582 | |
|
|
583 | Example 2: Implement a client for a protocol that replies either with |
|
|
584 | "OK" and another line or "ERROR" for one request, and 64 bytes for the |
|
|
585 | second request. Due tot he availability of a full queue, we can just |
|
|
586 | pipeline sending both requests and manipulate the queue as necessary in |
|
|
587 | the callbacks: |
|
|
588 | |
|
|
589 | # request one |
|
|
590 | $handle->push_write ("request 1\015\012"); |
|
|
591 | |
|
|
592 | # we expect "ERROR" or "OK" as response, so push a line read |
|
|
593 | $handle->push_read_line (sub { |
|
|
594 | # if we got an "OK", we have to _prepend_ another line, |
|
|
595 | # so it will be read before the second request reads its 64 bytes |
|
|
596 | # which are already in the queue when this callback is called |
|
|
597 | # we don't do this in case we got an error |
|
|
598 | if ($_[1] eq "OK") { |
|
|
599 | $_[0]->unshift_read_line (sub { |
|
|
600 | my $response = $_[1]; |
|
|
601 | ... |
|
|
602 | }); |
|
|
603 | } |
|
|
604 | }); |
|
|
605 | |
|
|
606 | # request two |
|
|
607 | $handle->push_write ("request 2\015\012"); |
|
|
608 | |
|
|
609 | # simply read 64 bytes, always |
|
|
610 | $handle->push_read_chunk (64, sub { |
|
|
611 | my $response = $_[1]; |
|
|
612 | ... |
|
|
613 | }); |
|
|
614 | |
|
|
615 | =over 4 |
|
|
616 | |
|
|
617 | =cut |
|
|
618 | |
|
|
619 | sub _drain_rbuf { |
|
|
620 | my ($self) = @_; |
|
|
621 | |
|
|
622 | if ( |
|
|
623 | defined $self->{rbuf_max} |
|
|
624 | && $self->{rbuf_max} < length $self->{rbuf} |
|
|
625 | ) { |
|
|
626 | $! = &Errno::ENOSPC; |
|
|
627 | $self->error; |
|
|
628 | } |
|
|
629 | |
|
|
630 | return if $self->{in_drain}; |
|
|
631 | local $self->{in_drain} = 1; |
|
|
632 | |
|
|
633 | while (my $len = length $self->{rbuf}) { |
|
|
634 | no strict 'refs'; |
|
|
635 | if (my $cb = shift @{ $self->{_queue} }) { |
|
|
636 | unless ($cb->($self)) { |
|
|
637 | if ($self->{_eof}) { |
|
|
638 | # no progress can be made (not enough data and no data forthcoming) |
|
|
639 | $! = &Errno::EPIPE; |
|
|
640 | $self->error; |
54 | } |
641 | } |
|
|
642 | |
|
|
643 | unshift @{ $self->{_queue} }, $cb; |
|
|
644 | return; |
55 | } |
645 | } |
56 | ); |
|
|
57 | |
|
|
58 | $cv->wait; |
|
|
59 | |
|
|
60 | =head1 DESCRIPTION |
|
|
61 | |
|
|
62 | This module is a helper module to make it easier to do non-blocking I/O |
|
|
63 | on filehandles (and sockets, see L<AnyEvent::Socket>). |
|
|
64 | |
|
|
65 | The event loop is provided by L<AnyEvent>. |
|
|
66 | |
|
|
67 | =head1 METHODS |
|
|
68 | |
|
|
69 | =over 4 |
|
|
70 | |
|
|
71 | =item B<new (%args)> |
|
|
72 | |
|
|
73 | The constructor has these arguments: |
|
|
74 | |
|
|
75 | =over 4 |
|
|
76 | |
|
|
77 | =item fh => $filehandle |
|
|
78 | |
|
|
79 | The filehandle this L<AnyEvent::Handle> object will operate on. |
|
|
80 | |
|
|
81 | NOTE: The filehandle will be set to non-blocking. |
|
|
82 | |
|
|
83 | =item read_block_size => $size |
|
|
84 | |
|
|
85 | The default read block size use for reads via the C<on_read> |
|
|
86 | method. |
|
|
87 | |
|
|
88 | =item on_read => $cb |
|
|
89 | |
|
|
90 | =item on_eof => $cb |
|
|
91 | |
|
|
92 | =item on_error => $cb |
|
|
93 | |
|
|
94 | These are shortcuts, that will call the corresponding method and set the callback to C<$cb>. |
|
|
95 | |
|
|
96 | =item on_readline => $cb |
|
|
97 | |
|
|
98 | The C<readlines> method is called with the default separated and C<$cb> as callback |
|
|
99 | for you. |
|
|
100 | |
|
|
101 | =back |
|
|
102 | |
|
|
103 | =cut |
|
|
104 | |
|
|
105 | sub new { |
|
|
106 | my $this = shift; |
|
|
107 | my $class = ref($this) || $this; |
|
|
108 | my $self = { |
|
|
109 | read_block_size => 4096, |
|
|
110 | rbuf => '', |
|
|
111 | @_ |
|
|
112 | }; |
|
|
113 | bless $self, $class; |
|
|
114 | |
|
|
115 | $self->{fh}->blocking (0) if $self->{fh}; |
|
|
116 | |
|
|
117 | if ($self->{on_read}) { |
|
|
118 | $self->on_read ($self->{on_read}); |
|
|
119 | |
|
|
120 | } elsif ($self->{on_readline}) { |
646 | } elsif ($self->{on_read}) { |
121 | $self->readlines ($self->{on_readline}); |
647 | $self->{on_read}($self); |
122 | |
648 | |
|
|
649 | if ( |
|
|
650 | $self->{_eof} # if no further data will arrive |
|
|
651 | && $len == length $self->{rbuf} # and no data has been consumed |
|
|
652 | && !@{ $self->{_queue} } # and the queue is still empty |
|
|
653 | && $self->{on_read} # and we still want to read data |
|
|
654 | ) { |
|
|
655 | # then no progress can be made |
|
|
656 | $! = &Errno::EPIPE; |
|
|
657 | $self->error; |
|
|
658 | } |
|
|
659 | } else { |
|
|
660 | # read side becomes idle |
|
|
661 | delete $self->{_rw}; |
|
|
662 | return; |
|
|
663 | } |
|
|
664 | } |
|
|
665 | |
123 | } elsif ($self->{on_eof}) { |
666 | if ($self->{_eof}) { |
124 | $self->on_eof ($self->{on_eof}); |
667 | $self->_shutdown; |
125 | |
668 | $self->{on_eof}($self) |
126 | } elsif ($self->{on_error}) { |
669 | if $self->{on_eof}; |
127 | $self->on_eof ($self->{on_error}); |
|
|
128 | } |
670 | } |
129 | |
|
|
130 | return $self |
|
|
131 | } |
671 | } |
132 | |
672 | |
133 | =item B<fh> |
673 | =item $handle->on_read ($cb) |
134 | |
674 | |
135 | This method returns the filehandle of the L<AnyEvent::Handle> object. |
675 | This replaces the currently set C<on_read> callback, or clears it (when |
136 | |
676 | the new callback is C<undef>). See the description of C<on_read> in the |
137 | =cut |
677 | constructor. |
138 | |
|
|
139 | sub fh { $_[0]->{fh} } |
|
|
140 | |
|
|
141 | =item B<on_read ($callback)> |
|
|
142 | |
|
|
143 | This method installs a C<$callback> that will be called |
|
|
144 | when new data arrived. You can access the read buffer via the C<rbuf> |
|
|
145 | method (see below). |
|
|
146 | |
|
|
147 | The first argument of the C<$callback> will be the L<AnyEvent::Handle> object. |
|
|
148 | |
678 | |
149 | =cut |
679 | =cut |
150 | |
680 | |
151 | sub on_read { |
681 | sub on_read { |
152 | my ($self, $cb) = @_; |
682 | my ($self, $cb) = @_; |
|
|
683 | |
153 | $self->{on_read} = $cb; |
684 | $self->{on_read} = $cb; |
|
|
685 | } |
154 | |
686 | |
155 | unless (defined $self->{on_read}) { |
687 | =item $handle->rbuf |
156 | delete $self->{on_read_w}; |
688 | |
157 | return; |
689 | Returns the read buffer (as a modifiable lvalue). |
|
|
690 | |
|
|
691 | You can access the read buffer directly as the C<< ->{rbuf} >> member, if |
|
|
692 | you want. |
|
|
693 | |
|
|
694 | NOTE: The read buffer should only be used or modified if the C<on_read>, |
|
|
695 | C<push_read> or C<unshift_read> methods are used. The other read methods |
|
|
696 | automatically manage the read buffer. |
|
|
697 | |
|
|
698 | =cut |
|
|
699 | |
|
|
700 | sub rbuf : lvalue { |
|
|
701 | $_[0]{rbuf} |
|
|
702 | } |
|
|
703 | |
|
|
704 | =item $handle->push_read ($cb) |
|
|
705 | |
|
|
706 | =item $handle->unshift_read ($cb) |
|
|
707 | |
|
|
708 | Append the given callback to the end of the queue (C<push_read>) or |
|
|
709 | prepend it (C<unshift_read>). |
|
|
710 | |
|
|
711 | The callback is called each time some additional read data arrives. |
|
|
712 | |
|
|
713 | It must check whether enough data is in the read buffer already. |
|
|
714 | |
|
|
715 | If not enough data is available, it must return the empty list or a false |
|
|
716 | value, in which case it will be called repeatedly until enough data is |
|
|
717 | available (or an error condition is detected). |
|
|
718 | |
|
|
719 | If enough data was available, then the callback must remove all data it is |
|
|
720 | interested in (which can be none at all) and return a true value. After returning |
|
|
721 | true, it will be removed from the queue. |
|
|
722 | |
|
|
723 | =cut |
|
|
724 | |
|
|
725 | our %RH; |
|
|
726 | |
|
|
727 | sub register_read_type($$) { |
|
|
728 | $RH{$_[0]} = $_[1]; |
|
|
729 | } |
|
|
730 | |
|
|
731 | sub push_read { |
|
|
732 | my $self = shift; |
|
|
733 | my $cb = pop; |
|
|
734 | |
|
|
735 | if (@_) { |
|
|
736 | my $type = shift; |
|
|
737 | |
|
|
738 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::push_read") |
|
|
739 | ->($self, $cb, @_); |
|
|
740 | } |
|
|
741 | |
|
|
742 | push @{ $self->{_queue} }, $cb; |
|
|
743 | $self->_drain_rbuf; |
|
|
744 | } |
|
|
745 | |
|
|
746 | sub unshift_read { |
|
|
747 | my $self = shift; |
|
|
748 | my $cb = pop; |
|
|
749 | |
|
|
750 | if (@_) { |
|
|
751 | my $type = shift; |
|
|
752 | |
|
|
753 | $cb = ($RH{$type} or Carp::croak "unsupported type passed to AnyEvent::Handle::unshift_read") |
|
|
754 | ->($self, $cb, @_); |
|
|
755 | } |
|
|
756 | |
|
|
757 | |
|
|
758 | unshift @{ $self->{_queue} }, $cb; |
|
|
759 | $self->_drain_rbuf; |
|
|
760 | } |
|
|
761 | |
|
|
762 | =item $handle->push_read (type => @args, $cb) |
|
|
763 | |
|
|
764 | =item $handle->unshift_read (type => @args, $cb) |
|
|
765 | |
|
|
766 | Instead of providing a callback that parses the data itself you can chose |
|
|
767 | between a number of predefined parsing formats, for chunks of data, lines |
|
|
768 | etc. |
|
|
769 | |
|
|
770 | Predefined types are (if you have ideas for additional types, feel free to |
|
|
771 | drop by and tell us): |
|
|
772 | |
|
|
773 | =over 4 |
|
|
774 | |
|
|
775 | =item chunk => $octets, $cb->($handle, $data) |
|
|
776 | |
|
|
777 | Invoke the callback only once C<$octets> bytes have been read. Pass the |
|
|
778 | data read to the callback. The callback will never be called with less |
|
|
779 | data. |
|
|
780 | |
|
|
781 | Example: read 2 bytes. |
|
|
782 | |
|
|
783 | $handle->push_read (chunk => 2, sub { |
|
|
784 | warn "yay ", unpack "H*", $_[1]; |
158 | } |
785 | }); |
159 | |
786 | |
160 | $self->{on_read_w} = |
787 | =cut |
161 | AnyEvent->io (poll => 'r', fh => $self->{fh}, cb => sub { |
788 | |
162 | #d# warn "READ:[$self->{read_size}] $self->{read_block_size} : ".length ($self->{rbuf})."\n"; |
789 | register_read_type chunk => sub { |
163 | my $rbuf_len = length $self->{rbuf}; |
790 | my ($self, $cb, $len) = @_; |
164 | my $l; |
791 | |
165 | if (defined $self->{read_size}) { |
792 | sub { |
166 | $l = sysread $self->{fh}, $self->{rbuf}, |
793 | $len <= length $_[0]{rbuf} or return; |
167 | ($self->{read_size} - $rbuf_len), $rbuf_len; |
794 | $cb->($_[0], substr $_[0]{rbuf}, 0, $len, ""); |
168 | } else { |
795 | 1 |
169 | $l = sysread $self->{fh}, $self->{rbuf}, $self->{read_block_size}, $rbuf_len; |
796 | } |
|
|
797 | }; |
|
|
798 | |
|
|
799 | # compatibility with older API |
|
|
800 | sub push_read_chunk { |
|
|
801 | $_[0]->push_read (chunk => $_[1], $_[2]); |
|
|
802 | } |
|
|
803 | |
|
|
804 | sub unshift_read_chunk { |
|
|
805 | $_[0]->unshift_read (chunk => $_[1], $_[2]); |
|
|
806 | } |
|
|
807 | |
|
|
808 | =item line => [$eol, ]$cb->($handle, $line, $eol) |
|
|
809 | |
|
|
810 | The callback will be called only once a full line (including the end of |
|
|
811 | line marker, C<$eol>) has been read. This line (excluding the end of line |
|
|
812 | marker) will be passed to the callback as second argument (C<$line>), and |
|
|
813 | the end of line marker as the third argument (C<$eol>). |
|
|
814 | |
|
|
815 | The end of line marker, C<$eol>, can be either a string, in which case it |
|
|
816 | will be interpreted as a fixed record end marker, or it can be a regex |
|
|
817 | object (e.g. created by C<qr>), in which case it is interpreted as a |
|
|
818 | regular expression. |
|
|
819 | |
|
|
820 | The end of line marker argument C<$eol> is optional, if it is missing (NOT |
|
|
821 | undef), then C<qr|\015?\012|> is used (which is good for most internet |
|
|
822 | protocols). |
|
|
823 | |
|
|
824 | Partial lines at the end of the stream will never be returned, as they are |
|
|
825 | not marked by the end of line marker. |
|
|
826 | |
|
|
827 | =cut |
|
|
828 | |
|
|
829 | register_read_type line => sub { |
|
|
830 | my ($self, $cb, $eol) = @_; |
|
|
831 | |
|
|
832 | $eol = qr|(\015?\012)| if @_ < 3; |
|
|
833 | $eol = quotemeta $eol unless ref $eol; |
|
|
834 | $eol = qr|^(.*?)($eol)|s; |
|
|
835 | |
|
|
836 | sub { |
|
|
837 | $_[0]{rbuf} =~ s/$eol// or return; |
|
|
838 | |
|
|
839 | $cb->($_[0], $1, $2); |
|
|
840 | 1 |
|
|
841 | } |
|
|
842 | }; |
|
|
843 | |
|
|
844 | # compatibility with older API |
|
|
845 | sub push_read_line { |
|
|
846 | my $self = shift; |
|
|
847 | $self->push_read (line => @_); |
|
|
848 | } |
|
|
849 | |
|
|
850 | sub unshift_read_line { |
|
|
851 | my $self = shift; |
|
|
852 | $self->unshift_read (line => @_); |
|
|
853 | } |
|
|
854 | |
|
|
855 | =item netstring => $cb->($handle, $string) |
|
|
856 | |
|
|
857 | A netstring (http://cr.yp.to/proto/netstrings.txt, this is not an endorsement). |
|
|
858 | |
|
|
859 | Throws an error with C<$!> set to EBADMSG on format violations. |
|
|
860 | |
|
|
861 | =cut |
|
|
862 | |
|
|
863 | register_read_type netstring => sub { |
|
|
864 | my ($self, $cb) = @_; |
|
|
865 | |
|
|
866 | sub { |
|
|
867 | unless ($_[0]{rbuf} =~ s/^(0|[1-9][0-9]*)://) { |
|
|
868 | if ($_[0]{rbuf} =~ /[^0-9]/) { |
|
|
869 | $! = &Errno::EBADMSG; |
|
|
870 | $self->error; |
170 | } |
871 | } |
171 | #d# warn "READL $l [$self->{rbuf}]\n"; |
872 | return; |
|
|
873 | } |
172 | |
874 | |
173 | if (not defined $l) { |
875 | my $len = $1; |
174 | return if $! == EAGAIN || $! == EINTR; |
|
|
175 | $self->{on_error}->($self) if $self->{on_error}; |
|
|
176 | delete $self->{on_read_w}; |
|
|
177 | |
876 | |
178 | } elsif ($l == 0) { |
877 | $self->unshift_read (chunk => $len, sub { |
179 | $self->{on_eof}->($self) if $self->{on_eof}; |
878 | my $string = $_[1]; |
180 | delete $self->{on_read_w}; |
879 | $_[0]->unshift_read (chunk => 1, sub { |
181 | |
880 | if ($_[1] eq ",") { |
|
|
881 | $cb->($_[0], $string); |
182 | } else { |
882 | } else { |
183 | $self->{on_read}->($self); |
883 | $! = &Errno::EBADMSG; |
|
|
884 | $self->error; |
|
|
885 | } |
|
|
886 | }); |
|
|
887 | }); |
|
|
888 | |
|
|
889 | 1 |
|
|
890 | } |
|
|
891 | }; |
|
|
892 | |
|
|
893 | =item regex => $accept[, $reject[, $skip], $cb->($handle, $data) |
|
|
894 | |
|
|
895 | Makes a regex match against the regex object C<$accept> and returns |
|
|
896 | everything up to and including the match. |
|
|
897 | |
|
|
898 | Example: read a single line terminated by '\n'. |
|
|
899 | |
|
|
900 | $handle->push_read (regex => qr<\n>, sub { ... }); |
|
|
901 | |
|
|
902 | If C<$reject> is given and not undef, then it determines when the data is |
|
|
903 | to be rejected: it is matched against the data when the C<$accept> regex |
|
|
904 | does not match and generates an C<EBADMSG> error when it matches. This is |
|
|
905 | useful to quickly reject wrong data (to avoid waiting for a timeout or a |
|
|
906 | receive buffer overflow). |
|
|
907 | |
|
|
908 | Example: expect a single decimal number followed by whitespace, reject |
|
|
909 | anything else (not the use of an anchor). |
|
|
910 | |
|
|
911 | $handle->push_read (regex => qr<^[0-9]+\s>, qr<[^0-9]>, sub { ... }); |
|
|
912 | |
|
|
913 | If C<$skip> is given and not C<undef>, then it will be matched against |
|
|
914 | the receive buffer when neither C<$accept> nor C<$reject> match, |
|
|
915 | and everything preceding and including the match will be accepted |
|
|
916 | unconditionally. This is useful to skip large amounts of data that you |
|
|
917 | know cannot be matched, so that the C<$accept> or C<$reject> regex do not |
|
|
918 | have to start matching from the beginning. This is purely an optimisation |
|
|
919 | and is usually worth only when you expect more than a few kilobytes. |
|
|
920 | |
|
|
921 | Example: expect a http header, which ends at C<\015\012\015\012>. Since we |
|
|
922 | expect the header to be very large (it isn't in practise, but...), we use |
|
|
923 | a skip regex to skip initial portions. The skip regex is tricky in that |
|
|
924 | it only accepts something not ending in either \015 or \012, as these are |
|
|
925 | required for the accept regex. |
|
|
926 | |
|
|
927 | $handle->push_read (regex => |
|
|
928 | qr<\015\012\015\012>, |
|
|
929 | undef, # no reject |
|
|
930 | qr<^.*[^\015\012]>, |
|
|
931 | sub { ... }); |
|
|
932 | |
|
|
933 | =cut |
|
|
934 | |
|
|
935 | register_read_type regex => sub { |
|
|
936 | my ($self, $cb, $accept, $reject, $skip) = @_; |
|
|
937 | |
|
|
938 | my $data; |
|
|
939 | my $rbuf = \$self->{rbuf}; |
|
|
940 | |
|
|
941 | sub { |
|
|
942 | # accept |
|
|
943 | if ($$rbuf =~ $accept) { |
|
|
944 | $data .= substr $$rbuf, 0, $+[0], ""; |
|
|
945 | $cb->($self, $data); |
|
|
946 | return 1; |
|
|
947 | } |
|
|
948 | |
|
|
949 | # reject |
|
|
950 | if ($reject && $$rbuf =~ $reject) { |
|
|
951 | $! = &Errno::EBADMSG; |
|
|
952 | $self->error; |
|
|
953 | } |
|
|
954 | |
|
|
955 | # skip |
|
|
956 | if ($skip && $$rbuf =~ $skip) { |
|
|
957 | $data .= substr $$rbuf, 0, $+[0], ""; |
|
|
958 | } |
|
|
959 | |
|
|
960 | () |
|
|
961 | } |
|
|
962 | }; |
|
|
963 | |
|
|
964 | =item json => $cb->($handle, $hash_or_arrayref) |
|
|
965 | |
|
|
966 | Reads a JSON object or array, decodes it and passes it to the callback. |
|
|
967 | |
|
|
968 | If a C<json> object was passed to the constructor, then that will be used |
|
|
969 | for the final decode, otherwise it will create a JSON coder expecting UTF-8. |
|
|
970 | |
|
|
971 | This read type uses the incremental parser available with JSON version |
|
|
972 | 2.09 (and JSON::XS version 2.2) and above. You have to provide a |
|
|
973 | dependency on your own: this module will load the JSON module, but |
|
|
974 | AnyEvent does not depend on it itself. |
|
|
975 | |
|
|
976 | Since JSON texts are fully self-delimiting, the C<json> read and write |
|
|
977 | types are an ideal simple RPC protocol: just exchange JSON datagrams. See |
|
|
978 | the C<json> write type description, above, for an actual example. |
|
|
979 | |
|
|
980 | =cut |
|
|
981 | |
|
|
982 | register_read_type json => sub { |
|
|
983 | my ($self, $cb, $accept, $reject, $skip) = @_; |
|
|
984 | |
|
|
985 | require JSON; |
|
|
986 | |
|
|
987 | my $data; |
|
|
988 | my $rbuf = \$self->{rbuf}; |
|
|
989 | |
|
|
990 | my $json = $self->{json} ||= JSON->new->utf8; |
|
|
991 | |
|
|
992 | sub { |
|
|
993 | my $ref = $json->incr_parse ($self->{rbuf}); |
|
|
994 | |
|
|
995 | if ($ref) { |
|
|
996 | $self->{rbuf} = $json->incr_text; |
|
|
997 | $json->incr_text = ""; |
|
|
998 | $cb->($self, $ref); |
|
|
999 | |
|
|
1000 | 1 |
|
|
1001 | } else { |
|
|
1002 | $self->{rbuf} = ""; |
|
|
1003 | () |
|
|
1004 | } |
|
|
1005 | } |
|
|
1006 | }; |
|
|
1007 | |
|
|
1008 | =back |
|
|
1009 | |
|
|
1010 | =item AnyEvent::Handle::register_read_type type => $coderef->($handle, $cb, @args) |
|
|
1011 | |
|
|
1012 | This function (not method) lets you add your own types to C<push_read>. |
|
|
1013 | |
|
|
1014 | Whenever the given C<type> is used, C<push_read> will invoke the code |
|
|
1015 | reference with the handle object, the callback and the remaining |
|
|
1016 | arguments. |
|
|
1017 | |
|
|
1018 | The code reference is supposed to return a callback (usually a closure) |
|
|
1019 | that works as a plain read callback (see C<< ->push_read ($cb) >>). |
|
|
1020 | |
|
|
1021 | It should invoke the passed callback when it is done reading (remember to |
|
|
1022 | pass C<$handle> as first argument as all other callbacks do that). |
|
|
1023 | |
|
|
1024 | Note that this is a function, and all types registered this way will be |
|
|
1025 | global, so try to use unique names. |
|
|
1026 | |
|
|
1027 | For examples, see the source of this module (F<perldoc -m AnyEvent::Handle>, |
|
|
1028 | search for C<register_read_type>)). |
|
|
1029 | |
|
|
1030 | =item $handle->stop_read |
|
|
1031 | |
|
|
1032 | =item $handle->start_read |
|
|
1033 | |
|
|
1034 | In rare cases you actually do not want to read anything from the |
|
|
1035 | socket. In this case you can call C<stop_read>. Neither C<on_read> no |
|
|
1036 | any queued callbacks will be executed then. To start reading again, call |
|
|
1037 | C<start_read>. |
|
|
1038 | |
|
|
1039 | =cut |
|
|
1040 | |
|
|
1041 | sub stop_read { |
|
|
1042 | my ($self) = @_; |
|
|
1043 | |
|
|
1044 | delete $self->{_rw}; |
|
|
1045 | } |
|
|
1046 | |
|
|
1047 | sub start_read { |
|
|
1048 | my ($self) = @_; |
|
|
1049 | |
|
|
1050 | unless ($self->{_rw} || $self->{_eof}) { |
|
|
1051 | Scalar::Util::weaken $self; |
|
|
1052 | |
|
|
1053 | $self->{_rw} = AnyEvent->io (fh => $self->{fh}, poll => "r", cb => sub { |
|
|
1054 | my $rbuf = $self->{filter_r} ? \my $buf : \$self->{rbuf}; |
|
|
1055 | my $len = sysread $self->{fh}, $$rbuf, $self->{read_size} || 8192, length $$rbuf; |
|
|
1056 | |
|
|
1057 | if ($len > 0) { |
|
|
1058 | $self->{_activity} = AnyEvent->now; |
|
|
1059 | |
|
|
1060 | $self->{filter_r} |
|
|
1061 | ? $self->{filter_r}->($self, $rbuf) |
|
|
1062 | : $self->_drain_rbuf; |
|
|
1063 | |
|
|
1064 | } elsif (defined $len) { |
|
|
1065 | delete $self->{_rw}; |
|
|
1066 | $self->{_eof} = 1; |
|
|
1067 | $self->_drain_rbuf; |
|
|
1068 | |
|
|
1069 | } elsif ($! != EAGAIN && $! != EINTR && $! != WSAEWOULDBLOCK) { |
|
|
1070 | return $self->error; |
184 | } |
1071 | } |
185 | }); |
1072 | }); |
|
|
1073 | } |
186 | } |
1074 | } |
187 | |
1075 | |
188 | =item B<on_error ($callback)> |
1076 | sub _dotls { |
189 | |
|
|
190 | Whenever a read or write operation resulted in an error the C<$callback> |
|
|
191 | will be called. |
|
|
192 | |
|
|
193 | The first argument of C<$callback> will be the L<AnyEvent::Handle> object itself. |
|
|
194 | The error is given as errno in C<$!>. |
|
|
195 | |
|
|
196 | =cut |
|
|
197 | |
|
|
198 | sub on_error { |
|
|
199 | $_[0]->{on_error} = $_[1]; |
|
|
200 | } |
|
|
201 | |
|
|
202 | =item B<on_eof ($callback)> |
|
|
203 | |
|
|
204 | Installs the C<$callback> that will be called when the end of file is |
|
|
205 | encountered in a read operation this C<$callback> will be called. The first |
|
|
206 | argument will be the L<AnyEvent::Handle> object itself. |
|
|
207 | |
|
|
208 | =cut |
|
|
209 | |
|
|
210 | sub on_eof { |
|
|
211 | $_[0]->{on_eof} = $_[1]; |
|
|
212 | } |
|
|
213 | |
|
|
214 | =item B<rbuf> |
|
|
215 | |
|
|
216 | Returns a reference to the read buffer. |
|
|
217 | |
|
|
218 | NOTE: The read buffer should only be used or modified if the C<on_read> |
|
|
219 | method is used directly. The C<read> and C<readlines> methods will provide |
|
|
220 | the read data to their callbacks. |
|
|
221 | |
|
|
222 | =cut |
|
|
223 | |
|
|
224 | sub rbuf : lvalue { |
|
|
225 | $_[0]->{rbuf} |
|
|
226 | } |
|
|
227 | |
|
|
228 | =item B<read ($len, $callback)> |
|
|
229 | |
|
|
230 | Will read exactly C<$len> bytes from the filehandle and call the C<$callback> |
|
|
231 | if done so. The first argument to the C<$callback> will be the L<AnyEvent::Handle> |
|
|
232 | object itself and the second argument the read data. |
|
|
233 | |
|
|
234 | NOTE: This method will override any callbacks installed via the C<on_read> method. |
|
|
235 | |
|
|
236 | =cut |
|
|
237 | |
|
|
238 | sub read { |
|
|
239 | my ($self, $len, $cb) = @_; |
1077 | my ($self) = @_; |
240 | |
1078 | |
241 | $self->{read_cb} = $cb; |
1079 | if (length $self->{_tls_wbuf}) { |
242 | my $old_blk_size = $self->{read_block_size}; |
1080 | while ((my $len = Net::SSLeay::write ($self->{tls}, $self->{_tls_wbuf})) > 0) { |
243 | $self->{read_block_size} = $len; |
1081 | substr $self->{_tls_wbuf}, 0, $len, ""; |
244 | |
|
|
245 | $self->on_read (sub { |
|
|
246 | #d# warn "OFOFO $len || ".length($_[0]->{rbuf})."||\n"; |
|
|
247 | |
|
|
248 | if ($len == length $_[0]->{rbuf}) { |
|
|
249 | $_[0]->{read_block_size} = $old_blk_size; |
|
|
250 | $_[0]->on_read (undef); |
|
|
251 | $_[0]->{read_cb}->($_[0], (substr $self->{rbuf}, 0, $len, '')); |
|
|
252 | } |
1082 | } |
253 | }); |
1083 | } |
254 | } |
|
|
255 | |
1084 | |
256 | =item B<readlines ($callback)> |
1085 | if (defined (my $buf = Net::SSLeay::BIO_read ($self->{_wbio}))) { |
257 | |
1086 | $self->{wbuf} .= $buf; |
258 | =item B<readlines ($sep, $callback)> |
1087 | $self->_drain_wbuf; |
259 | |
|
|
260 | This method will read lines from the filehandle, separated by C<$sep> or C<"\n"> |
|
|
261 | if C<$sep> is not provided. C<$sep> will be used as "line" separated. |
|
|
262 | |
|
|
263 | The C<$callback> will be called when at least one |
|
|
264 | line could be read. The first argument to the C<$callback> will be the L<AnyEvent::Handle> |
|
|
265 | object itself and the rest of the arguments will be the read lines. |
|
|
266 | |
|
|
267 | NOTE: This method will override any callbacks installed via the C<on_read> method. |
|
|
268 | |
|
|
269 | =cut |
|
|
270 | |
|
|
271 | sub readlines { |
|
|
272 | my ($self, $sep, $cb) = @_; |
|
|
273 | |
|
|
274 | if (ref $sep) { |
|
|
275 | $cb = $sep; |
|
|
276 | $sep = "\n"; |
|
|
277 | |
|
|
278 | } elsif (not defined $sep) { |
|
|
279 | $sep = "\n"; |
|
|
280 | } |
1088 | } |
281 | |
1089 | |
282 | my $sep_len = length $sep; |
1090 | while (defined (my $buf = Net::SSLeay::read ($self->{tls}))) { |
|
|
1091 | $self->{rbuf} .= $buf; |
|
|
1092 | $self->_drain_rbuf; |
|
|
1093 | } |
283 | |
1094 | |
284 | $self->{on_readline} = $cb; |
1095 | my $err = Net::SSLeay::get_error ($self->{tls}, -1); |
285 | |
1096 | |
286 | $self->on_read (sub { |
1097 | if ($err!= Net::SSLeay::ERROR_WANT_READ ()) { |
287 | my @lines; |
1098 | if ($err == Net::SSLeay::ERROR_SYSCALL ()) { |
288 | my $rb = \$_[0]->{rbuf}; |
1099 | $self->error; |
289 | my $pos; |
1100 | } elsif ($err == Net::SSLeay::ERROR_SSL ()) { |
290 | while (($pos = index ($$rb, $sep)) >= 0) { |
1101 | $! = &Errno::EIO; |
291 | push @lines, substr $$rb, 0, $pos + $sep_len, ''; |
1102 | $self->error; |
292 | } |
1103 | } |
293 | $self->{on_readline}->($_[0], @lines); |
1104 | |
|
|
1105 | # all others are fine for our purposes |
|
|
1106 | } |
|
|
1107 | } |
|
|
1108 | |
|
|
1109 | =item $handle->starttls ($tls[, $tls_ctx]) |
|
|
1110 | |
|
|
1111 | Instead of starting TLS negotiation immediately when the AnyEvent::Handle |
|
|
1112 | object is created, you can also do that at a later time by calling |
|
|
1113 | C<starttls>. |
|
|
1114 | |
|
|
1115 | The first argument is the same as the C<tls> constructor argument (either |
|
|
1116 | C<"connect">, C<"accept"> or an existing Net::SSLeay object). |
|
|
1117 | |
|
|
1118 | The second argument is the optional C<Net::SSLeay::CTX> object that is |
|
|
1119 | used when AnyEvent::Handle has to create its own TLS connection object. |
|
|
1120 | |
|
|
1121 | The TLS connection object will end up in C<< $handle->{tls} >> after this |
|
|
1122 | call and can be used or changed to your liking. Note that the handshake |
|
|
1123 | might have already started when this function returns. |
|
|
1124 | |
|
|
1125 | =cut |
|
|
1126 | |
|
|
1127 | # TODO: maybe document... |
|
|
1128 | sub starttls { |
|
|
1129 | my ($self, $ssl, $ctx) = @_; |
|
|
1130 | |
|
|
1131 | $self->stoptls; |
|
|
1132 | |
|
|
1133 | if ($ssl eq "accept") { |
|
|
1134 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
|
|
1135 | Net::SSLeay::set_accept_state ($ssl); |
|
|
1136 | } elsif ($ssl eq "connect") { |
|
|
1137 | $ssl = Net::SSLeay::new ($ctx || TLS_CTX ()); |
|
|
1138 | Net::SSLeay::set_connect_state ($ssl); |
|
|
1139 | } |
|
|
1140 | |
|
|
1141 | $self->{tls} = $ssl; |
|
|
1142 | |
|
|
1143 | # basically, this is deep magic (because SSL_read should have the same issues) |
|
|
1144 | # but the openssl maintainers basically said: "trust us, it just works". |
|
|
1145 | # (unfortunately, we have to hardcode constants because the abysmally misdesigned |
|
|
1146 | # and mismaintained ssleay-module doesn't even offer them). |
|
|
1147 | # http://www.mail-archive.com/openssl-dev@openssl.org/msg22420.html |
|
|
1148 | Net::SSLeay::CTX_set_mode ($self->{tls}, |
|
|
1149 | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE () } || 1) |
|
|
1150 | | (eval { local $SIG{__DIE__}; Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER () } || 2)); |
|
|
1151 | |
|
|
1152 | $self->{_rbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
|
|
1153 | $self->{_wbio} = Net::SSLeay::BIO_new (Net::SSLeay::BIO_s_mem ()); |
|
|
1154 | |
|
|
1155 | Net::SSLeay::set_bio ($ssl, $self->{_rbio}, $self->{_wbio}); |
|
|
1156 | |
|
|
1157 | $self->{filter_w} = sub { |
|
|
1158 | $_[0]{_tls_wbuf} .= ${$_[1]}; |
|
|
1159 | &_dotls; |
294 | }); |
1160 | }; |
|
|
1161 | $self->{filter_r} = sub { |
|
|
1162 | Net::SSLeay::BIO_write ($_[0]{_rbio}, ${$_[1]}); |
|
|
1163 | &_dotls; |
|
|
1164 | }; |
295 | } |
1165 | } |
296 | |
1166 | |
297 | =item B<write ($data)> |
1167 | =item $handle->stoptls |
298 | |
1168 | |
299 | =item B<write ($callback)> |
1169 | Destroys the SSL connection, if any. Partial read or write data will be |
|
|
1170 | lost. |
300 | |
1171 | |
301 | =item B<write ($data, $callback)> |
|
|
302 | |
|
|
303 | This method will write C<$data> to the filehandle and call the C<$callback> |
|
|
304 | afterwards. If only C<$callback> is provided it will be called when the |
|
|
305 | write buffer becomes empty the next time (or immediately if it already is empty). |
|
|
306 | |
|
|
307 | =cut |
1172 | =cut |
308 | |
1173 | |
309 | sub write { |
1174 | sub stoptls { |
310 | my ($self, $data, $cb) = @_; |
|
|
311 | if (ref $data) { $cb = $data; undef $data } |
|
|
312 | push @{$self->{write_bufs}}, [$data, $cb]; |
|
|
313 | $self->_check_writer; |
|
|
314 | } |
|
|
315 | |
|
|
316 | sub _check_writer { |
|
|
317 | my ($self) = @_; |
1175 | my ($self) = @_; |
318 | |
1176 | |
319 | if ($self->{write_w}) { |
1177 | Net::SSLeay::free (delete $self->{tls}) if $self->{tls}; |
320 | unless ($self->{write_cb}) { |
|
|
321 | while (@{$self->{write_bufs}} && not defined $self->{write_bufs}->[0]->[1]) { |
|
|
322 | my $wba = shift @{$self->{write_bufs}}; |
|
|
323 | $self->{wbuf} .= $wba->[0]; |
|
|
324 | } |
|
|
325 | } |
|
|
326 | return; |
|
|
327 | } |
|
|
328 | |
1178 | |
329 | my $wba = shift @{$self->{write_bufs}} |
1179 | delete $self->{_rbio}; |
330 | or return; |
1180 | delete $self->{_wbio}; |
331 | |
1181 | delete $self->{_tls_wbuf}; |
332 | unless (defined $wba->[0]) { |
1182 | delete $self->{filter_r}; |
333 | $wba->[1]->($self) if $wba->[1]; |
|
|
334 | $self->_check_writer; |
|
|
335 | return; |
|
|
336 | } |
|
|
337 | |
|
|
338 | $self->{wbuf} = $wba->[0]; |
|
|
339 | $self->{write_cb} = $wba->[1]; |
|
|
340 | |
|
|
341 | $self->{write_w} = |
|
|
342 | AnyEvent->io (poll => 'w', fh => $self->{fh}, cb => sub { |
|
|
343 | my $l = syswrite $self->{fh}, $self->{wbuf}, length $self->{wbuf}; |
|
|
344 | |
|
|
345 | if (not defined $l) { |
|
|
346 | return if $! == EAGAIN || $! == EINTR; |
|
|
347 | delete $self->{write_w}; |
1183 | delete $self->{filter_w}; |
348 | $self->{on_error}->($self) if $self->{on_error}; |
1184 | } |
349 | |
1185 | |
350 | } else { |
1186 | sub DESTROY { |
351 | substr $self->{wbuf}, 0, $l, ''; |
1187 | my $self = shift; |
352 | |
1188 | |
353 | if (length ($self->{wbuf}) == 0) { |
1189 | $self->stoptls; |
354 | $self->{write_cb}->($self) if $self->{write_cb}; |
1190 | } |
355 | |
1191 | |
356 | delete $self->{write_w}; |
1192 | =item AnyEvent::Handle::TLS_CTX |
357 | delete $self->{wbuf}; |
|
|
358 | delete $self->{write_cb}; |
|
|
359 | |
1193 | |
360 | $self->_check_writer; |
1194 | This function creates and returns the Net::SSLeay::CTX object used by |
361 | } |
1195 | default for TLS mode. |
362 | } |
1196 | |
363 | }); |
1197 | The context is created like this: |
|
|
1198 | |
|
|
1199 | Net::SSLeay::load_error_strings; |
|
|
1200 | Net::SSLeay::SSLeay_add_ssl_algorithms; |
|
|
1201 | Net::SSLeay::randomize; |
|
|
1202 | |
|
|
1203 | my $CTX = Net::SSLeay::CTX_new; |
|
|
1204 | |
|
|
1205 | Net::SSLeay::CTX_set_options $CTX, Net::SSLeay::OP_ALL |
|
|
1206 | |
|
|
1207 | =cut |
|
|
1208 | |
|
|
1209 | our $TLS_CTX; |
|
|
1210 | |
|
|
1211 | sub TLS_CTX() { |
|
|
1212 | $TLS_CTX || do { |
|
|
1213 | require Net::SSLeay; |
|
|
1214 | |
|
|
1215 | Net::SSLeay::load_error_strings (); |
|
|
1216 | Net::SSLeay::SSLeay_add_ssl_algorithms (); |
|
|
1217 | Net::SSLeay::randomize (); |
|
|
1218 | |
|
|
1219 | $TLS_CTX = Net::SSLeay::CTX_new (); |
|
|
1220 | |
|
|
1221 | Net::SSLeay::CTX_set_options ($TLS_CTX, Net::SSLeay::OP_ALL ()); |
|
|
1222 | |
|
|
1223 | $TLS_CTX |
|
|
1224 | } |
364 | } |
1225 | } |
365 | |
1226 | |
366 | =back |
1227 | =back |
367 | |
1228 | |
|
|
1229 | =head1 SUBCLASSING AnyEvent::Handle |
|
|
1230 | |
|
|
1231 | In many cases, you might want to subclass AnyEvent::Handle. |
|
|
1232 | |
|
|
1233 | To make this easier, a given version of AnyEvent::Handle uses these |
|
|
1234 | conventions: |
|
|
1235 | |
|
|
1236 | =over 4 |
|
|
1237 | |
|
|
1238 | =item * all constructor arguments become object members. |
|
|
1239 | |
|
|
1240 | At least initially, when you pass a C<tls>-argument to the constructor it |
|
|
1241 | will end up in C<< $handle->{tls} >>. Those members might be changes or |
|
|
1242 | mutated later on (for example C<tls> will hold the TLS connection object). |
|
|
1243 | |
|
|
1244 | =item * other object member names are prefixed with an C<_>. |
|
|
1245 | |
|
|
1246 | All object members not explicitly documented (internal use) are prefixed |
|
|
1247 | with an underscore character, so the remaining non-C<_>-namespace is free |
|
|
1248 | for use for subclasses. |
|
|
1249 | |
|
|
1250 | =item * all members not documented here and not prefixed with an underscore |
|
|
1251 | are free to use in subclasses. |
|
|
1252 | |
|
|
1253 | Of course, new versions of AnyEvent::Handle may introduce more "public" |
|
|
1254 | member variables, but thats just life, at least it is documented. |
|
|
1255 | |
|
|
1256 | =back |
|
|
1257 | |
368 | =head1 AUTHOR |
1258 | =head1 AUTHOR |
369 | |
1259 | |
370 | Robin Redeker, C<< <elmex at ta-sa.org> >> |
1260 | Robin Redeker C<< <elmex at ta-sa.org> >>, Marc Lehmann <schmorp@schmorp.de>. |
371 | |
1261 | |
372 | =cut |
1262 | =cut |
373 | |
1263 | |
374 | 1; # End of AnyEvent::Handle |
1264 | 1; # End of AnyEvent::Handle |