| … | |
… | |
| 4 | |
4 | |
| 5 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
| 6 | |
6 | |
| 7 | use AnyEvent::MP; |
7 | use AnyEvent::MP; |
| 8 | |
8 | |
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9 | NODE # returns this node identifier |
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10 | $NODE # contains this node identifier |
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11 | |
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12 | snd $port, type => data...; |
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13 | |
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14 | rcv $port, smartmatch => $cb->($port, @msg); |
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15 | |
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16 | # examples: |
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17 | rcv $port2, ping => sub { snd $_[0], "pong"; 0 }; |
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18 | rcv $port1, pong => sub { warn "pong received\n" }; |
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19 | snd $port2, ping => $port1; |
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20 | |
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21 | # more, smarter, matches (_any_ is exported by this module) |
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22 | rcv $port, [child_died => $pid] => sub { ... |
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23 | rcv $port, [_any_, _any_, 3] => sub { .. $_[2] is 3 |
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24 | |
| 9 | =head1 DESCRIPTION |
25 | =head1 DESCRIPTION |
| 10 | |
26 | |
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27 | This module (-family) implements a simple message passing framework. |
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28 | |
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29 | Despite its simplicity, you can securely message other processes running |
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30 | on the same or other hosts. |
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31 | |
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32 | At the moment, this module family is severly brokena nd underdocumented, |
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33 | so do not use. This was uploaded mainly to resreve the CPAN namespace - |
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34 | stay tuned! |
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35 | |
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36 | =head1 CONCEPTS |
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37 | |
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38 | =over 4 |
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39 | |
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40 | =item port |
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41 | |
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42 | A port is something you can send messages to with the C<snd> function, and |
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43 | you can register C<rcv> handlers with. All C<rcv> handlers will receive |
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44 | messages they match, messages will not be queued. |
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45 | |
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46 | =item port id - C<noderef#portname> |
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47 | |
|
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48 | A port id is always the noderef, a hash-mark (C<#>) as separator, followed |
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49 | by a port name (a printable string of unspecified format). |
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50 | |
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51 | =item node |
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52 | |
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53 | A node is a single process containing at least one port - the node |
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54 | port. You can send messages to node ports to let them create new ports, |
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55 | among other things. |
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56 | |
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57 | Initially, nodes are either private (single-process only) or hidden |
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58 | (connected to a master node only). Only when they epxlicitly "become |
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59 | public" can you send them messages from unrelated other nodes. |
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60 | |
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61 | =item noderef - C<host:port,host:port...>, C<id@noderef>, C<id> |
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62 | |
|
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63 | A noderef is a string that either uniquely identifies a given node (for |
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64 | private and hidden nodes), or contains a recipe on how to reach a given |
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65 | node (for public nodes). |
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66 | |
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67 | =back |
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68 | |
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69 | =head1 VARIABLES/FUNCTIONS |
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70 | |
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71 | =over 4 |
|
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72 | |
| 11 | =cut |
73 | =cut |
| 12 | |
74 | |
| 13 | package AnyEvent::MP; |
75 | package AnyEvent::MP; |
| 14 | |
76 | |
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77 | use AnyEvent::MP::Base; |
|
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78 | |
| 15 | use common::sense; |
79 | use common::sense; |
| 16 | |
80 | |
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81 | use Carp (); |
|
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82 | |
| 17 | use AE (); |
83 | use AE (); |
| 18 | |
84 | |
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85 | use base "Exporter"; |
|
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86 | |
| 19 | our $VERSION = '0.0'; |
87 | our $VERSION = '0.02'; |
|
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88 | our @EXPORT = qw( |
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89 | NODE $NODE $PORT snd rcv _any_ |
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90 | create_port create_port_on |
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91 | create_miniport |
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92 | become_slave become_public |
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93 | ); |
| 20 | |
94 | |
| 21 | sub nonce($) { |
95 | =item NODE / $NODE |
| 22 | my $nonce; |
|
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| 23 | |
96 | |
| 24 | if (open my $fh, "</dev/urandom") { |
97 | The C<NODE ()> function and the C<$NODE> variable contain the noderef of |
| 25 | sysread $fh, $nonce, $_[0]; |
98 | the local node. The value is initialised by a call to C<become_public> or |
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99 | C<become_slave>, after which all local port identifiers become invalid. |
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100 | |
|
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101 | =item snd $portid, type => @data |
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102 | |
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103 | =item snd $portid, @msg |
|
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104 | |
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105 | Send the given message to the given port ID, which can identify either |
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106 | a local or a remote port, and can be either a string or soemthignt hat |
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107 | stringifies a sa port ID (such as a port object :). |
|
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108 | |
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109 | While the message can be about anything, it is highly recommended to use a |
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110 | string as first element (a portid, or some word that indicates a request |
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111 | type etc.). |
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112 | |
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113 | The message data effectively becomes read-only after a call to this |
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114 | function: modifying any argument is not allowed and can cause many |
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115 | problems. |
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116 | |
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117 | The type of data you can transfer depends on the transport protocol: when |
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118 | JSON is used, then only strings, numbers and arrays and hashes consisting |
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119 | of those are allowed (no objects). When Storable is used, then anything |
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120 | that Storable can serialise and deserialise is allowed, and for the local |
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121 | node, anything can be passed. |
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122 | |
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123 | =item $local_port = create_port |
|
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124 | |
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125 | Create a new local port object. See the next section for allowed methods. |
|
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126 | |
|
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127 | =cut |
|
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128 | |
|
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129 | sub create_port { |
|
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130 | my $id = "$AnyEvent::MP::Base::UNIQ." . ++$AnyEvent::MP::Base::ID; |
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131 | |
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132 | my $self = bless { |
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133 | id => "$NODE#$id", |
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134 | names => [$id], |
|
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135 | }, "AnyEvent::MP::Port"; |
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136 | |
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137 | $AnyEvent::MP::Base::PORT{$id} = sub { |
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138 | unshift @_, $self; |
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139 | |
|
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140 | for (@{ $self->{rc0}{$_[1]} }) { |
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141 | $_ && &{$_->[0]} |
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142 | && undef $_; |
|
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143 | } |
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144 | |
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145 | for (@{ $self->{rcv}{$_[1]} }) { |
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146 | $_ && [@_[1 .. @{$_->[1]}]] ~~ $_->[1] |
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147 | && &{$_->[0]} |
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148 | && undef $_; |
|
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149 | } |
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150 | |
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151 | for (@{ $self->{any} }) { |
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152 | $_ && [@_[0 .. $#{$_->[1]}]] ~~ $_->[1] |
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153 | && &{$_->[0]} |
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154 | && undef $_; |
|
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155 | } |
|
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156 | }; |
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157 | |
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158 | $self |
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159 | } |
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160 | |
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161 | =item $portid = create_miniport { } |
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162 | |
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163 | Creates a "mini port", that is, a port without much #TODO |
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164 | |
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165 | =cut |
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166 | |
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167 | sub create_miniport(&) { |
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168 | my $cb = shift; |
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169 | my $id = "$AnyEvent::MP::Base::UNIQ." . ++$AnyEvent::MP::Base::ID; |
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170 | |
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171 | $AnyEvent::MP::Base::PORT{$id} = sub { |
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172 | # unshift @_, "$NODE#$id"; |
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173 | &$cb |
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174 | and delete $AnyEvent::MP::Base::PORT{$id}; |
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175 | }; |
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176 | |
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177 | "$NODE#$id" |
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178 | } |
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179 | |
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180 | package AnyEvent::MP::Port; |
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181 | |
|
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182 | =back |
|
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183 | |
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184 | =head1 METHODS FOR PORT OBJECTS |
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185 | |
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186 | =over 4 |
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187 | |
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188 | =item "$port" |
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189 | |
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190 | A port object stringifies to its port ID, so can be used directly for |
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191 | C<snd> operations. |
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192 | |
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193 | =cut |
|
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194 | |
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195 | use overload |
|
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196 | '""' => sub { $_[0]{id} }, |
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197 | fallback => 1; |
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198 | |
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199 | =item $port->rcv (type => $callback->($port, @msg)) |
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200 | |
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201 | =item $port->rcv ($smartmatch => $callback->($port, @msg)) |
|
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202 | |
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203 | =item $port->rcv ([$smartmatch...] => $callback->($port, @msg)) |
|
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204 | |
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205 | Register a callback on the given port. |
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206 | |
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207 | The callback has to return a true value when its work is done, after |
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208 | which is will be removed, or a false value in which case it will stay |
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209 | registered. |
|
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210 | |
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211 | If the match is an array reference, then it will be matched against the |
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212 | first elements of the message, otherwise only the first element is being |
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213 | matched. |
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214 | |
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215 | Any element in the match that is specified as C<_any_> (a function |
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216 | exported by this module) matches any single element of the message. |
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217 | |
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218 | While not required, it is highly recommended that the first matching |
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219 | element is a string identifying the message. The one-string-only match is |
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220 | also the most efficient match (by far). |
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221 | |
|
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222 | =cut |
|
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223 | |
|
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224 | sub rcv($@) { |
|
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225 | my ($self, $match, $cb) = @_; |
|
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226 | |
|
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227 | if (!ref $match) { |
|
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228 | push @{ $self->{rc0}{$match} }, [$cb]; |
|
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229 | } elsif (("ARRAY" eq ref $match && !ref $match->[0])) { |
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230 | my ($type, @match) = @$match; |
|
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231 | @match |
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232 | ? push @{ $self->{rcv}{$match->[0]} }, [$cb, \@match] |
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233 | : push @{ $self->{rc0}{$match->[0]} }, [$cb]; |
| 26 | } else { |
234 | } else { |
| 27 | # shit... |
235 | push @{ $self->{any} }, [$cb, $match]; |
| 28 | our $nonce_init; |
|
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| 29 | unless ($nonce_init++) { |
|
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| 30 | srand time ^ $$ ^ unpack "%L*", qx"ps -edalf" . qx"ipconfig /all"; |
|
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| 31 | } |
|
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| 32 | |
|
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| 33 | $nonce = join "", map +(chr rand 256), 1 .. $_[0] |
|
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| 34 | } |
236 | } |
| 35 | |
|
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| 36 | $nonce |
|
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| 37 | } |
237 | } |
| 38 | |
238 | |
| 39 | our $DEFAULT_SECRET; |
239 | =item $port->register ($name) |
| 40 | |
240 | |
| 41 | sub default_secret { |
241 | Registers the given port under the well known name C<$name>. If the name |
| 42 | unless (defined $DEFAULT_SECRET) { |
242 | already exists it is replaced. |
| 43 | if (open my $fh, "<$ENV{HOME}/.aemp-secret") { |
|
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| 44 | sysread $fh, $DEFAULT_SECRET, -s $fh; |
|
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| 45 | } else { |
|
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| 46 | $DEFAULT_SECRET = nonce 32; |
|
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| 47 | } |
|
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| 48 | } |
|
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| 49 | |
243 | |
| 50 | $DEFAULT_SECRET |
244 | A port can only be registered under one well known name. |
|
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245 | |
|
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246 | =cut |
|
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247 | |
|
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248 | sub register { |
|
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249 | my ($self, $name) = @_; |
|
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250 | |
|
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251 | $self->{wkname} = $name; |
|
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252 | $AnyEvent::MP::Base::WKP{$name} = "$self"; |
| 51 | } |
253 | } |
|
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254 | |
|
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255 | =item $port->destroy |
|
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256 | |
|
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257 | Explicitly destroy/remove/nuke/vaporise the port. |
|
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258 | |
|
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259 | Ports are normally kept alive by there mere existance alone, and need to |
|
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260 | be destroyed explicitly. |
|
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261 | |
|
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262 | =cut |
|
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263 | |
|
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264 | sub destroy { |
|
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265 | my ($self) = @_; |
|
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266 | |
|
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267 | delete $AnyEvent::MP::Base::WKP{ $self->{wkname} }; |
|
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268 | |
|
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269 | delete $AnyEvent::MP::Base::PORT{$_} |
|
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270 | for @{ $self->{names} }; |
|
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271 | } |
|
|
272 | |
|
|
273 | =back |
|
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274 | |
|
|
275 | =head1 FUNCTIONS FOR NODES |
|
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276 | |
|
|
277 | =over 4 |
|
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278 | |
|
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279 | =item mon $noderef, $callback->($noderef, $status, $) |
|
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280 | |
|
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281 | Monitors the given noderef. |
|
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282 | |
|
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283 | =item become_public endpoint... |
|
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284 | |
|
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285 | Tells the node to become a public node, i.e. reachable from other nodes. |
|
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286 | |
|
|
287 | If no arguments are given, or the first argument is C<undef>, then |
|
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288 | AnyEvent::MP tries to bind on port C<4040> on all IP addresses that the |
|
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289 | local nodename resolves to. |
|
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290 | |
|
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291 | Otherwise the first argument must be an array-reference with transport |
|
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292 | endpoints ("ip:port", "hostname:port") or port numbers (in which case the |
|
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293 | local nodename is used as hostname). The endpoints are all resolved and |
|
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294 | will become the node reference. |
|
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295 | |
|
|
296 | =cut |
|
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297 | |
|
|
298 | =back |
|
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299 | |
|
|
300 | =head1 NODE MESSAGES |
|
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301 | |
|
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302 | Nodes understand the following messages sent to them. Many of them take |
|
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303 | arguments called C<@reply>, which will simply be used to compose a reply |
|
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304 | message - C<$reply[0]> is the port to reply to, C<$reply[1]> the type and |
|
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305 | the remaining arguments are simply the message data. |
|
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306 | |
|
|
307 | =over 4 |
|
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308 | |
|
|
309 | =cut |
|
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310 | |
|
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311 | =item wkp => $name, @reply |
|
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312 | |
|
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313 | Replies with the port ID of the specified well-known port, or C<undef>. |
|
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314 | |
|
|
315 | =item devnull => ... |
|
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316 | |
|
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317 | Generic data sink/CPU heat conversion. |
|
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318 | |
|
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319 | =item relay => $port, @msg |
|
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320 | |
|
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321 | Simply forwards the message to the given port. |
|
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322 | |
|
|
323 | =item eval => $string[ @reply] |
|
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324 | |
|
|
325 | Evaluates the given string. If C<@reply> is given, then a message of the |
|
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326 | form C<@reply, $@, @evalres> is sent. |
|
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327 | |
|
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328 | Example: crash another node. |
|
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329 | |
|
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330 | snd $othernode, eval => "exit"; |
|
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331 | |
|
|
332 | =item time => @reply |
|
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333 | |
|
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334 | Replies the the current node time to C<@reply>. |
|
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335 | |
|
|
336 | Example: tell the current node to send the current time to C<$myport> in a |
|
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337 | C<timereply> message. |
|
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338 | |
|
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339 | snd $NODE, time => $myport, timereply => 1, 2; |
|
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340 | # => snd $myport, timereply => 1, 2, <time> |
|
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341 | |
|
|
342 | =back |
| 52 | |
343 | |
| 53 | =head1 SEE ALSO |
344 | =head1 SEE ALSO |
| 54 | |
345 | |
| 55 | L<AnyEvent>. |
346 | L<AnyEvent>. |
| 56 | |
347 | |
