… | |
… | |
4 | |
4 | |
5 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
6 | |
6 | |
7 | use AnyEvent::MP; |
7 | use AnyEvent::MP; |
8 | |
8 | |
9 | NODE # returns this node identifier |
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10 | $NODE # contains this node identifier |
9 | $NODE # contains this node's noderef |
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10 | NODE # returns this node's noderef |
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11 | NODE $port # returns the noderef of the port |
11 | |
12 | |
12 | snd $port, type => data...; |
13 | snd $port, type => data...; |
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14 | |
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15 | $SELF # receiving/own port id in rcv callbacks |
13 | |
16 | |
14 | rcv $port, smartmatch => $cb->($port, @msg); |
17 | rcv $port, smartmatch => $cb->($port, @msg); |
15 | |
18 | |
16 | # examples: |
19 | # examples: |
17 | rcv $port2, ping => sub { snd $_[0], "pong"; 0 }; |
20 | rcv $port2, ping => sub { snd $_[0], "pong"; 0 }; |
… | |
… | |
20 | |
23 | |
21 | # more, smarter, matches (_any_ is exported by this module) |
24 | # more, smarter, matches (_any_ is exported by this module) |
22 | rcv $port, [child_died => $pid] => sub { ... |
25 | rcv $port, [child_died => $pid] => sub { ... |
23 | rcv $port, [_any_, _any_, 3] => sub { .. $_[2] is 3 |
26 | rcv $port, [_any_, _any_, 3] => sub { .. $_[2] is 3 |
24 | |
27 | |
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28 | # linking two ports, so they both crash together |
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29 | lnk $port1, $port2; |
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30 | |
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31 | # monitoring |
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32 | mon $port, $cb->(@msg) # callback is invoked on death |
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33 | mon $port, $otherport # kill otherport on abnormal death |
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34 | mon $port, $otherport, @msg # send message on death |
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35 | |
25 | =head1 DESCRIPTION |
36 | =head1 DESCRIPTION |
26 | |
37 | |
27 | This module (-family) implements a simple message passing framework. |
38 | This module (-family) implements a simple message passing framework. |
28 | |
39 | |
29 | Despite its simplicity, you can securely message other processes running |
40 | Despite its simplicity, you can securely message other processes running |
30 | on the same or other hosts. |
41 | on the same or other hosts. |
31 | |
42 | |
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43 | For an introduction to this module family, see the L<AnyEvent::MP::Intro> |
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44 | manual page. |
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45 | |
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46 | At the moment, this module family is severly broken and underdocumented, |
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47 | so do not use. This was uploaded mainly to reserve the CPAN namespace - |
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48 | stay tuned! The basic API should be finished, however. |
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49 | |
32 | =head1 CONCEPTS |
50 | =head1 CONCEPTS |
33 | |
51 | |
34 | =over 4 |
52 | =over 4 |
35 | |
53 | |
36 | =item port |
54 | =item port |
37 | |
55 | |
38 | A port is something you can send messages to with the C<snd> function, and |
56 | A port is something you can send messages to (with the C<snd> function). |
39 | you can register C<rcv> handlers with. All C<rcv> handlers will receive |
57 | |
40 | messages they match, messages will not be queued. |
58 | Some ports allow you to register C<rcv> handlers that can match specific |
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59 | messages. All C<rcv> handlers will receive messages they match, messages |
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60 | will not be queued. |
41 | |
61 | |
42 | =item port id - C<noderef#portname> |
62 | =item port id - C<noderef#portname> |
43 | |
63 | |
44 | A port id is always the noderef, a hash-mark (C<#>) as separator, followed |
64 | A port id is normaly the concatenation of a noderef, a hash-mark (C<#>) as |
45 | by a port name (a printable string of unspecified format). |
65 | separator, and a port name (a printable string of unspecified format). An |
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66 | exception is the the node port, whose ID is identical to its node |
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67 | reference. |
46 | |
68 | |
47 | =item node |
69 | =item node |
48 | |
70 | |
49 | A node is a single process containing at least one port - the node |
71 | A node is a single process containing at least one port - the node |
50 | port. You can send messages to node ports to let them create new ports, |
72 | port. You can send messages to node ports to find existing ports or to |
51 | among other things. |
73 | create new ports, among other things. |
52 | |
74 | |
53 | Initially, nodes are either private (single-process only) or hidden |
75 | Nodes are either private (single-process only), slaves (connected to a |
54 | (connected to a master node only). Only when they epxlicitly "become |
76 | master node only) or public nodes (connectable from unrelated nodes). |
55 | public" can you send them messages from unrelated other nodes. |
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56 | |
77 | |
57 | =item noderef - C<host:port,host:port...>, C<id@noderef, C<id> |
78 | =item noderef - C<host:port,host:port...>, C<id@noderef>, C<id> |
58 | |
79 | |
59 | A noderef is a string that either uniquely identifies a given node (for |
80 | A node reference is a string that either simply identifies the node (for |
60 | private and hidden nodes), or contains a recipe on how to reach a given |
81 | private and slave nodes), or contains a recipe on how to reach a given |
61 | node (for public nodes). |
82 | node (for public nodes). |
62 | |
83 | |
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84 | This recipe is simply a comma-separated list of C<address:port> pairs (for |
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85 | TCP/IP, other protocols might look different). |
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86 | |
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87 | Node references come in two flavours: resolved (containing only numerical |
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88 | addresses) or unresolved (where hostnames are used instead of addresses). |
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89 | |
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90 | Before using an unresolved node reference in a message you first have to |
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91 | resolve it. |
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92 | |
63 | =back |
93 | =back |
64 | |
94 | |
65 | =head1 VARIABLES/FUNCTIONS |
95 | =head1 VARIABLES/FUNCTIONS |
66 | |
96 | |
67 | =over 4 |
97 | =over 4 |
68 | |
98 | |
69 | =cut |
99 | =cut |
70 | |
100 | |
71 | package AnyEvent::MP; |
101 | package AnyEvent::MP; |
72 | |
102 | |
73 | use AnyEvent::MP::Util (); |
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74 | use AnyEvent::MP::Node; |
103 | use AnyEvent::MP::Base; |
75 | use AnyEvent::MP::Transport; |
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76 | |
104 | |
77 | use utf8; |
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78 | use common::sense; |
105 | use common::sense; |
79 | |
106 | |
80 | use Carp (); |
107 | use Carp (); |
81 | |
108 | |
82 | use AE (); |
109 | use AE (); |
83 | |
110 | |
84 | use base "Exporter"; |
111 | use base "Exporter"; |
85 | |
112 | |
86 | our $VERSION = '0.0'; |
113 | our $VERSION = '0.1'; |
87 | our @EXPORT = qw(NODE $NODE $PORT snd rcv _any_); |
114 | our @EXPORT = qw( |
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115 | NODE $NODE *SELF node_of _any_ |
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116 | resolve_node initialise_node |
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117 | snd rcv mon kil reg psub |
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118 | port |
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119 | ); |
88 | |
120 | |
89 | our $DEFAULT_SECRET; |
121 | our $SELF; |
90 | our $DEFAULT_PORT = "4040"; |
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91 | |
122 | |
92 | our $CONNECT_INTERVAL = 5; # new connect every 5s, at least |
123 | sub _self_die() { |
93 | our $CONNECT_TIMEOUT = 30; # includes handshake |
124 | my $msg = $@; |
94 | |
125 | $msg =~ s/\n+$// unless ref $msg; |
95 | sub default_secret { |
126 | kil $SELF, die => $msg; |
96 | unless (defined $DEFAULT_SECRET) { |
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97 | if (open my $fh, "<$ENV{HOME}/.aemp-secret") { |
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98 | sysread $fh, $DEFAULT_SECRET, -s $fh; |
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99 | } else { |
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100 | $DEFAULT_SECRET = AnyEvent::MP::Util::nonce 32; |
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101 | } |
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102 | } |
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103 | |
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104 | $DEFAULT_SECRET |
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105 | } |
127 | } |
106 | |
128 | |
107 | =item NODE / $NODE |
129 | =item $thisnode = NODE / $NODE |
108 | |
130 | |
109 | The C<NODE ()> function and the C<$NODE> variable contain the noderef of |
131 | The C<NODE> function returns, and the C<$NODE> variable contains |
110 | the local node. The value is initialised by a call to C<become_public> or |
132 | the noderef of the local node. The value is initialised by a call |
111 | C<become_slave>, after which all local port identifiers become invalid. |
133 | to C<become_public> or C<become_slave>, after which all local port |
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134 | identifiers become invalid. |
112 | |
135 | |
113 | =cut |
136 | =item $noderef = node_of $port |
114 | |
137 | |
115 | our $UNIQ = sprintf "%x.%x", $$, time; # per-process/node unique cookie |
138 | Extracts and returns the noderef from a portid or a noderef. |
116 | our $PUBLIC = 0; |
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117 | our $NODE; |
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118 | our $PORT; |
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119 | |
139 | |
120 | our %NODE; # node id to transport mapping, or "undef", for local node |
140 | =item initialise_node $noderef, $seednode, $seednode... |
121 | our %PORT; # local ports |
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122 | our %LISTENER; # local transports |
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123 | |
141 | |
124 | sub NODE() { $NODE } |
142 | =item initialise_node "slave/", $master, $master... |
125 | |
143 | |
126 | { |
144 | Before a node can talk to other nodes on the network it has to initialise |
127 | use POSIX (); |
145 | itself - the minimum a node needs to know is it's own name, and optionally |
128 | my $nodename = (POSIX::uname)[1]; |
146 | it should know the noderefs of some other nodes in the network. |
129 | $NODE = "$$\@$nodename"; |
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130 | } |
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131 | |
147 | |
132 | sub _ANY_() { 1 } |
148 | This function initialises a node - it must be called exactly once (or |
133 | sub _any_() { \&_ANY_ } |
149 | never) before calling other AnyEvent::MP functions. |
134 | |
150 | |
135 | sub add_node { |
151 | All arguments are noderefs, which can be either resolved or unresolved. |
136 | my ($noderef) = @_; |
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137 | |
152 | |
138 | return $NODE{$noderef} |
153 | There are two types of networked nodes, public nodes and slave nodes: |
139 | if exists $NODE{$noderef}; |
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140 | |
154 | |
141 | for (split /,/, $noderef) { |
155 | =over 4 |
142 | return $NODE{$noderef} = $NODE{$_} |
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143 | if exists $NODE{$_}; |
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144 | } |
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145 | |
156 | |
146 | # for indirect sends, use a different class |
157 | =item public nodes |
147 | my $node = new AnyEvent::MP::Node::Direct $noderef; |
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148 | |
158 | |
149 | $NODE{$_} = $node |
159 | For public nodes, C<$noderef> must either be a (possibly unresolved) |
150 | for $noderef, split /,/, $noderef; |
160 | noderef, in which case it will be resolved, or C<undef> (or missing), in |
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161 | which case the noderef will be guessed. |
151 | |
162 | |
152 | $node |
163 | Afterwards, the node will bind itself on all endpoints and try to connect |
153 | } |
164 | to all additional C<$seednodes> that are specified. Seednodes are optional |
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165 | and can be used to quickly bootstrap the node into an existing network. |
154 | |
166 | |
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167 | =item slave nodes |
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168 | |
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169 | When the C<$noderef> is the special string C<slave/>, then the node will |
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170 | become a slave node. Slave nodes cannot be contacted from outside and will |
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171 | route most of their traffic to the master node that they attach to. |
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172 | |
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173 | At least one additional noderef is required: The node will try to connect |
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174 | to all of them and will become a slave attached to the first node it can |
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175 | successfully connect to. |
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176 | |
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177 | =back |
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178 | |
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179 | This function will block until all nodes have been resolved and, for slave |
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180 | nodes, until it has successfully established a connection to a master |
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181 | server. |
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182 | |
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183 | Example: become a public node listening on the default node. |
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184 | |
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185 | initialise_node; |
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186 | |
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187 | Example: become a public node, and try to contact some well-known master |
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188 | servers to become part of the network. |
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189 | |
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190 | initialise_node undef, "master1", "master2"; |
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191 | |
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192 | Example: become a public node listening on port C<4041>. |
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193 | |
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194 | initialise_node 4041; |
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195 | |
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196 | Example: become a public node, only visible on localhost port 4044. |
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197 | |
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198 | initialise_node "locahost:4044"; |
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199 | |
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200 | Example: become a slave node to any of the specified master servers. |
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201 | |
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202 | initialise_node "slave/", "master1", "192.168.13.17", "mp.example.net"; |
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203 | |
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204 | =item $cv = resolve_node $noderef |
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205 | |
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206 | Takes an unresolved node reference that may contain hostnames and |
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207 | abbreviated IDs, resolves all of them and returns a resolved node |
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208 | reference. |
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209 | |
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210 | In addition to C<address:port> pairs allowed in resolved noderefs, the |
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211 | following forms are supported: |
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212 | |
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213 | =over 4 |
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214 | |
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215 | =item the empty string |
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216 | |
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217 | An empty-string component gets resolved as if the default port (4040) was |
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218 | specified. |
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219 | |
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220 | =item naked port numbers (e.g. C<1234>) |
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221 | |
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222 | These are resolved by prepending the local nodename and a colon, to be |
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223 | further resolved. |
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224 | |
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225 | =item hostnames (e.g. C<localhost:1234>, C<localhost>) |
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226 | |
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227 | These are resolved by using AnyEvent::DNS to resolve them, optionally |
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228 | looking up SRV records for the C<aemp=4040> port, if no port was |
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229 | specified. |
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230 | |
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231 | =back |
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232 | |
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233 | =item $SELF |
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234 | |
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235 | Contains the current port id while executing C<rcv> callbacks or C<psub> |
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236 | blocks. |
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237 | |
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238 | =item SELF, %SELF, @SELF... |
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239 | |
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240 | Due to some quirks in how perl exports variables, it is impossible to |
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241 | just export C<$SELF>, all the symbols called C<SELF> are exported by this |
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242 | module, but only C<$SELF> is currently used. |
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243 | |
155 | =item snd $portid, type => @data |
244 | =item snd $port, type => @data |
156 | |
245 | |
157 | =item snd $portid, @msg |
246 | =item snd $port, @msg |
158 | |
247 | |
159 | Send the given message to the given port ID, which can identify either a |
248 | Send the given message to the given port ID, which can identify either |
160 | local or a remote port. |
249 | a local or a remote port, and can be either a string or soemthignt hat |
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250 | stringifies a sa port ID (such as a port object :). |
161 | |
251 | |
162 | While the message can be about anything, it is highly recommended to use |
252 | While the message can be about anything, it is highly recommended to use a |
163 | a constant string as first element. |
253 | string as first element (a portid, or some word that indicates a request |
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254 | type etc.). |
164 | |
255 | |
165 | The message data effectively becomes read-only after a call to this |
256 | The message data effectively becomes read-only after a call to this |
166 | function: modifying any argument is not allowed and can cause many |
257 | function: modifying any argument is not allowed and can cause many |
167 | problems. |
258 | problems. |
168 | |
259 | |
… | |
… | |
170 | JSON is used, then only strings, numbers and arrays and hashes consisting |
261 | JSON is used, then only strings, numbers and arrays and hashes consisting |
171 | of those are allowed (no objects). When Storable is used, then anything |
262 | of those are allowed (no objects). When Storable is used, then anything |
172 | that Storable can serialise and deserialise is allowed, and for the local |
263 | that Storable can serialise and deserialise is allowed, and for the local |
173 | node, anything can be passed. |
264 | node, anything can be passed. |
174 | |
265 | |
175 | =cut |
266 | =item $local_port = port |
176 | |
267 | |
177 | sub snd(@) { |
268 | Create a new local port object that can be used either as a pattern |
178 | my ($noderef, $port) = split /#/, shift, 2; |
269 | matching port ("full port") or a single-callback port ("miniport"), |
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270 | depending on how C<rcv> callbacks are bound to the object. |
179 | |
271 | |
180 | add_node $noderef |
272 | =item $port = port { my @msg = @_; $finished } |
181 | unless exists $NODE{$noderef}; |
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182 | |
273 | |
183 | $NODE{$noderef}->send (["$port", [@_]]); |
274 | Creates a "miniport", that is, a very lightweight port without any pattern |
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275 | matching behind it, and returns its ID. Semantically the same as creating |
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276 | a port and calling C<rcv $port, $callback> on it. |
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277 | |
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278 | The block will be called for every message received on the port. When the |
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279 | callback returns a true value its job is considered "done" and the port |
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280 | will be destroyed. Otherwise it will stay alive. |
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281 | |
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282 | The message will be passed as-is, no extra argument (i.e. no port id) will |
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283 | be passed to the callback. |
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284 | |
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285 | If you need the local port id in the callback, this works nicely: |
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286 | |
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287 | my $port; $port = port { |
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288 | snd $otherport, reply => $port; |
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289 | }; |
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290 | |
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291 | =cut |
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292 | |
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293 | sub rcv($@); |
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294 | |
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295 | sub port(;&) { |
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296 | my $id = "$UNIQ." . $ID++; |
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297 | my $port = "$NODE#$id"; |
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298 | |
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299 | if (@_) { |
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300 | rcv $port, shift; |
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301 | } else { |
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302 | $PORT{$id} = sub { }; # nop |
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303 | } |
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304 | |
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305 | $port |
184 | } |
306 | } |
185 | |
307 | |
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308 | =item reg $port, $name |
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309 | |
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310 | =item reg $name |
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311 | |
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312 | Registers the given port (or C<$SELF><<< if missing) under the name |
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313 | C<$name>. If the name already exists it is replaced. |
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314 | |
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315 | A port can only be registered under one well known name. |
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316 | |
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317 | A port automatically becomes unregistered when it is killed. |
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318 | |
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319 | =cut |
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320 | |
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321 | sub reg(@) { |
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322 | my $port = @_ > 1 ? shift : $SELF || Carp::croak 'reg: called with one argument only, but $SELF not set,'; |
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323 | |
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324 | $REG{$_[0]} = $port; |
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325 | } |
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326 | |
186 | =item rcv $portid, type => $callback->(@msg) |
327 | =item rcv $port, $callback->(@msg) |
187 | |
328 | |
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329 | Replaces the callback on the specified miniport (after converting it to |
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330 | one if required). |
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331 | |
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332 | =item rcv $port, tagstring => $callback->(@msg), ... |
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333 | |
188 | =item rcv $portid, $smartmatch => $callback->(@msg) |
334 | =item rcv $port, $smartmatch => $callback->(@msg), ... |
189 | |
335 | |
190 | =item rcv $portid, [$smartmatch...] => $callback->(@msg) |
336 | =item rcv $port, [$smartmatch...] => $callback->(@msg), ... |
191 | |
337 | |
192 | Register a callback on the port identified by C<$portid>, which I<must> be |
338 | Register callbacks to be called on matching messages on the given full |
193 | a local port. |
339 | port (after converting it to one if required) and return the port. |
194 | |
340 | |
195 | The callback has to return a true value when its work is done, after |
341 | The callback has to return a true value when its work is done, after |
196 | which is will be removed, or a false value in which case it will stay |
342 | which is will be removed, or a false value in which case it will stay |
197 | registered. |
343 | registered. |
198 | |
344 | |
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345 | The global C<$SELF> (exported by this module) contains C<$port> while |
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346 | executing the callback. |
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347 | |
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348 | Runtime errors wdurign callback execution will result in the port being |
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349 | C<kil>ed. |
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350 | |
199 | If the match is an array reference, then it will be matched against the |
351 | If the match is an array reference, then it will be matched against the |
200 | first elements of the message, otherwise only the first element is being |
352 | first elements of the message, otherwise only the first element is being |
201 | matched. |
353 | matched. |
202 | |
354 | |
203 | Any element in the match that is specified as C<_any_> (a function |
355 | Any element in the match that is specified as C<_any_> (a function |
… | |
… | |
205 | |
357 | |
206 | While not required, it is highly recommended that the first matching |
358 | While not required, it is highly recommended that the first matching |
207 | element is a string identifying the message. The one-string-only match is |
359 | element is a string identifying the message. The one-string-only match is |
208 | also the most efficient match (by far). |
360 | also the most efficient match (by far). |
209 | |
361 | |
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362 | Example: create a port and bind receivers on it in one go. |
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363 | |
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364 | my $port = rcv port, |
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365 | msg1 => sub { ...; 0 }, |
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366 | msg2 => sub { ...; 0 }, |
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367 | ; |
|
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368 | |
|
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369 | Example: create a port, bind receivers and send it in a message elsewhere |
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370 | in one go: |
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371 | |
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372 | snd $otherport, reply => |
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373 | rcv port, |
|
|
374 | msg1 => sub { ...; 0 }, |
|
|
375 | ... |
|
|
376 | ; |
|
|
377 | |
210 | =cut |
378 | =cut |
211 | |
379 | |
212 | sub rcv($@) { |
380 | sub rcv($@) { |
213 | my ($port, $match, $cb) = @_; |
381 | my $port = shift; |
214 | |
|
|
215 | my $port = $PORT{$port} |
|
|
216 | or do { |
|
|
217 | my ($noderef, $lport) = split /#/, $port; |
382 | my ($noderef, $portid) = split /#/, $port, 2; |
218 | "AnyEvent::MP::Node::Self" eq ref $NODE{$noderef} |
383 | |
|
|
384 | ($NODE{$noderef} || add_node $noderef) == $NODE{""} |
219 | or Carp::croak "$port: can only rcv on local ports"; |
385 | or Carp::croak "$port: rcv can only be called on local ports, caught"; |
220 | |
386 | |
221 | $PORT{$lport} |
387 | if (@_ == 1) { |
222 | or Carp::croak "$port: port does not exist"; |
388 | my $cb = shift; |
|
|
389 | delete $PORT_DATA{$portid}; |
|
|
390 | $PORT{$portid} = sub { |
|
|
391 | local $SELF = $port; |
|
|
392 | eval { |
223 | |
393 | &$cb |
224 | $PORT{$port} = $PORT{$lport} # also return |
394 | and kil $port; |
|
|
395 | }; |
|
|
396 | _self_die if $@; |
225 | }; |
397 | }; |
226 | |
|
|
227 | if (!ref $match) { |
|
|
228 | push @{ $port->{rc0}{$match} }, [$cb]; |
|
|
229 | } elsif (("ARRAY" eq ref $match && !ref $match->[0])) { |
|
|
230 | my ($type, @match) = @$match; |
|
|
231 | @match |
|
|
232 | ? push @{ $port->{rcv}{$match->[0]} }, [$cb, \@match] |
|
|
233 | : push @{ $port->{rc0}{$match->[0]} }, [$cb]; |
|
|
234 | } else { |
398 | } else { |
235 | push @{ $port->{any} }, [$cb, $match]; |
399 | my $self = $PORT_DATA{$portid} ||= do { |
236 | } |
400 | my $self = bless { |
237 | } |
401 | id => $port, |
|
|
402 | }, "AnyEvent::MP::Port"; |
238 | |
403 | |
239 | sub _inject { |
404 | $PORT{$portid} = sub { |
240 | my ($port, $msg) = @{+shift}; |
405 | local $SELF = $port; |
241 | |
406 | |
242 | $port = $PORT{$port} |
407 | eval { |
243 | or return; |
408 | for (@{ $self->{rc0}{$_[0]} }) { |
244 | |
|
|
245 | @_ = @$msg; |
|
|
246 | |
|
|
247 | for (@{ $port->{rc0}{$msg->[0]} }) { |
|
|
248 | $_ && &{$_->[0]} |
409 | $_ && &{$_->[0]} |
249 | && undef $_; |
410 | && undef $_; |
250 | } |
|
|
251 | |
|
|
252 | for (@{ $port->{rcv}{$msg->[0]} }) { |
|
|
253 | $_ && [@_[1..$#{$_->[1]}]] ~~ $_->[1] |
|
|
254 | && &{$_->[0]} |
|
|
255 | && undef $_; |
|
|
256 | } |
|
|
257 | |
|
|
258 | for (@{ $port->{any} }) { |
|
|
259 | $_ && [@_[0..$#{$_->[1]}]] ~~ $_->[1] |
|
|
260 | && &{$_->[0]} |
|
|
261 | && undef $_; |
|
|
262 | } |
|
|
263 | } |
|
|
264 | |
|
|
265 | sub normalise_noderef($) { |
|
|
266 | my ($noderef) = @_; |
|
|
267 | |
|
|
268 | my $cv = AE::cv; |
|
|
269 | my @res; |
|
|
270 | |
|
|
271 | $cv->begin (sub { |
|
|
272 | my %seen; |
|
|
273 | my @refs; |
|
|
274 | for (sort { $a->[0] <=> $b->[0] } @res) { |
|
|
275 | push @refs, $_->[1] unless $seen{$_->[1]}++ |
|
|
276 | } |
|
|
277 | shift->send (join ",", @refs); |
|
|
278 | }); |
|
|
279 | |
|
|
280 | $noderef = $DEFAULT_PORT unless length $noderef; |
|
|
281 | |
|
|
282 | my $idx; |
|
|
283 | for my $t (split /,/, $noderef) { |
|
|
284 | my $pri = ++$idx; |
|
|
285 | |
|
|
286 | #TODO: this should be outside normalise_noderef and in become_public |
|
|
287 | if ($t =~ /^\d*$/) { |
|
|
288 | my $nodename = (POSIX::uname)[1]; |
|
|
289 | |
|
|
290 | $cv->begin; |
|
|
291 | AnyEvent::Socket::resolve_sockaddr $nodename, $t || "aemp=$DEFAULT_PORT", "tcp", 0, undef, sub { |
|
|
292 | for (@_) { |
|
|
293 | my ($service, $host) = AnyEvent::Socket::unpack_sockaddr $_->[3]; |
|
|
294 | push @res, [ |
|
|
295 | $pri += 1e-5, |
|
|
296 | AnyEvent::Socket::format_hostport AnyEvent::Socket::format_address $host, $service |
|
|
297 | ]; |
411 | } |
|
|
412 | |
|
|
413 | for (@{ $self->{rcv}{$_[0]} }) { |
|
|
414 | $_ && [@_[1 .. @{$_->[1]}]] ~~ $_->[1] |
|
|
415 | && &{$_->[0]} |
|
|
416 | && undef $_; |
|
|
417 | } |
|
|
418 | |
|
|
419 | for (@{ $self->{any} }) { |
|
|
420 | $_ && [@_[0 .. $#{$_->[1]}]] ~~ $_->[1] |
|
|
421 | && &{$_->[0]} |
|
|
422 | && undef $_; |
|
|
423 | } |
298 | } |
424 | }; |
299 | $cv->end; |
425 | _self_die if $@; |
300 | }; |
426 | }; |
301 | |
427 | |
302 | # my (undef, undef, undef, undef, @ipv4) = gethostbyname $nodename; |
428 | $self |
303 | # |
429 | }; |
304 | # for (@ipv4) { |
430 | |
305 | # push @res, [ |
431 | "AnyEvent::MP::Port" eq ref $self |
306 | # $pri, |
432 | or Carp::croak "$port: rcv can only be called on message matching ports, caught"; |
307 | # AnyEvent::Socket::format_hostport AnyEvent::Socket::format_address $_, $t || $DEFAULT_PORT, |
433 | |
308 | # ]; |
434 | while (@_) { |
309 | # } |
435 | my ($match, $cb) = splice @_, 0, 2; |
|
|
436 | |
|
|
437 | if (!ref $match) { |
|
|
438 | push @{ $self->{rc0}{$match} }, [$cb]; |
|
|
439 | } elsif (("ARRAY" eq ref $match && !ref $match->[0])) { |
|
|
440 | my ($type, @match) = @$match; |
|
|
441 | @match |
|
|
442 | ? push @{ $self->{rcv}{$match->[0]} }, [$cb, \@match] |
|
|
443 | : push @{ $self->{rc0}{$match->[0]} }, [$cb]; |
310 | } else { |
444 | } else { |
311 | my ($host, $port) = AnyEvent::Socket::parse_hostport $t, "aemp=$DEFAULT_PORT" |
445 | push @{ $self->{any} }, [$cb, $match]; |
312 | or Carp::croak "$t: unparsable transport descriptor"; |
|
|
313 | |
|
|
314 | $cv->begin; |
|
|
315 | AnyEvent::Socket::resolve_sockaddr $host, $port, "tcp", 0, undef, sub { |
|
|
316 | for (@_) { |
|
|
317 | my ($service, $host) = AnyEvent::Socket::unpack_sockaddr $_->[3]; |
|
|
318 | push @res, [ |
|
|
319 | $pri += 1e-5, |
|
|
320 | AnyEvent::Socket::format_hostport AnyEvent::Socket::format_address $host, $service |
|
|
321 | ]; |
|
|
322 | } |
|
|
323 | $cv->end; |
|
|
324 | } |
446 | } |
325 | } |
447 | } |
326 | } |
448 | } |
327 | |
449 | |
328 | $cv->end; |
450 | $port |
329 | |
|
|
330 | $cv |
|
|
331 | } |
451 | } |
332 | |
452 | |
333 | sub become_public { |
453 | =item $closure = psub { BLOCK } |
334 | return if $PUBLIC; |
|
|
335 | |
454 | |
336 | my $noderef = join ",", ref $_[0] ? @{+shift} : shift; |
455 | Remembers C<$SELF> and creates a closure out of the BLOCK. When the |
337 | my @args = @_; |
456 | closure is executed, sets up the environment in the same way as in C<rcv> |
|
|
457 | callbacks, i.e. runtime errors will cause the port to get C<kil>ed. |
338 | |
458 | |
339 | $NODE = (normalise_noderef $noderef)->recv; |
459 | This is useful when you register callbacks from C<rcv> callbacks: |
340 | |
460 | |
341 | for my $t (split /,/, $NODE) { |
461 | rcv delayed_reply => sub { |
342 | $NODE{$t} = $NODE{""}; |
462 | my ($delay, @reply) = @_; |
343 | |
463 | my $timer = AE::timer $delay, 0, psub { |
344 | my ($host, $port) = AnyEvent::Socket::parse_hostport $t; |
464 | snd @reply, $SELF; |
345 | |
|
|
346 | $LISTENER{$t} = AnyEvent::MP::Transport::mp_server $host, $port, |
|
|
347 | @args, |
|
|
348 | on_error => sub { |
|
|
349 | die "on_error<@_>\n";#d# |
|
|
350 | }, |
|
|
351 | on_connect => sub { |
|
|
352 | my ($tp) = @_; |
|
|
353 | |
|
|
354 | $NODE{$tp->{remote_id}} = $_[0]; |
|
|
355 | }, |
|
|
356 | sub { |
|
|
357 | my ($tp) = @_; |
|
|
358 | |
|
|
359 | $NODE{"$tp->{peerhost}:$tp->{peerport}"} = $tp; |
|
|
360 | }, |
|
|
361 | ; |
465 | }; |
|
|
466 | }; |
|
|
467 | |
|
|
468 | =cut |
|
|
469 | |
|
|
470 | sub psub(&) { |
|
|
471 | my $cb = shift; |
|
|
472 | |
|
|
473 | my $port = $SELF |
|
|
474 | or Carp::croak "psub can only be called from within rcv or psub callbacks, not"; |
|
|
475 | |
|
|
476 | sub { |
|
|
477 | local $SELF = $port; |
|
|
478 | |
|
|
479 | if (wantarray) { |
|
|
480 | my @res = eval { &$cb }; |
|
|
481 | _self_die if $@; |
|
|
482 | @res |
|
|
483 | } else { |
|
|
484 | my $res = eval { &$cb }; |
|
|
485 | _self_die if $@; |
|
|
486 | $res |
|
|
487 | } |
362 | } |
488 | } |
363 | |
|
|
364 | $PUBLIC = 1; |
|
|
365 | } |
489 | } |
366 | |
490 | |
|
|
491 | =item $guard = mon $port, $cb->(@reason) |
|
|
492 | |
|
|
493 | =item $guard = mon $port, $rcvport |
|
|
494 | |
|
|
495 | =item $guard = mon $port |
|
|
496 | |
|
|
497 | =item $guard = mon $port, $rcvport, @msg |
|
|
498 | |
|
|
499 | Monitor the given port and do something when the port is killed, and |
|
|
500 | optionally return a guard that can be used to stop monitoring again. |
|
|
501 | |
|
|
502 | In the first form (callback), the callback is simply called with any |
|
|
503 | number of C<@reason> elements (no @reason means that the port was deleted |
|
|
504 | "normally"). Note also that I<< the callback B<must> never die >>, so use |
|
|
505 | C<eval> if unsure. |
|
|
506 | |
|
|
507 | In the second form (another port given), the other port (C<$rcvport) |
|
|
508 | will be C<kil>'ed with C<@reason>, iff a @reason was specified, i.e. on |
|
|
509 | "normal" kils nothing happens, while under all other conditions, the other |
|
|
510 | port is killed with the same reason. |
|
|
511 | |
|
|
512 | The third form (kill self) is the same as the second form, except that |
|
|
513 | C<$rvport> defaults to C<$SELF>. |
|
|
514 | |
|
|
515 | In the last form (message), a message of the form C<@msg, @reason> will be |
|
|
516 | C<snd>. |
|
|
517 | |
|
|
518 | Example: call a given callback when C<$port> is killed. |
|
|
519 | |
|
|
520 | mon $port, sub { warn "port died because of <@_>\n" }; |
|
|
521 | |
|
|
522 | Example: kill ourselves when C<$port> is killed abnormally. |
|
|
523 | |
|
|
524 | mon $port; |
|
|
525 | |
|
|
526 | Example: send us a restart message when another C<$port> is killed. |
|
|
527 | |
|
|
528 | mon $port, $self => "restart"; |
|
|
529 | |
|
|
530 | =cut |
|
|
531 | |
|
|
532 | sub mon { |
|
|
533 | my ($noderef, $port) = split /#/, shift, 2; |
|
|
534 | |
|
|
535 | my $node = $NODE{$noderef} || add_node $noderef; |
|
|
536 | |
|
|
537 | my $cb = @_ ? $_[0] : $SELF || Carp::croak 'mon: called with one argument only, but $SELF not set,'; |
|
|
538 | |
|
|
539 | unless (ref $cb) { |
|
|
540 | if (@_) { |
|
|
541 | # send a kill info message |
|
|
542 | my (@msg) = @_; |
|
|
543 | $cb = sub { snd @msg, @_ }; |
|
|
544 | } else { |
|
|
545 | # simply kill other port |
|
|
546 | my $port = $cb; |
|
|
547 | $cb = sub { kil $port, @_ if @_ }; |
|
|
548 | } |
|
|
549 | } |
|
|
550 | |
|
|
551 | $node->monitor ($port, $cb); |
|
|
552 | |
|
|
553 | defined wantarray |
|
|
554 | and AnyEvent::Util::guard { $node->unmonitor ($port, $cb) } |
|
|
555 | } |
|
|
556 | |
|
|
557 | =item $guard = mon_guard $port, $ref, $ref... |
|
|
558 | |
|
|
559 | Monitors the given C<$port> and keeps the passed references. When the port |
|
|
560 | is killed, the references will be freed. |
|
|
561 | |
|
|
562 | Optionally returns a guard that will stop the monitoring. |
|
|
563 | |
|
|
564 | This function is useful when you create e.g. timers or other watchers and |
|
|
565 | want to free them when the port gets killed: |
|
|
566 | |
|
|
567 | $port->rcv (start => sub { |
|
|
568 | my $timer; $timer = mon_guard $port, AE::timer 1, 1, sub { |
|
|
569 | undef $timer if 0.9 < rand; |
|
|
570 | }); |
|
|
571 | }); |
|
|
572 | |
|
|
573 | =cut |
|
|
574 | |
|
|
575 | sub mon_guard { |
|
|
576 | my ($port, @refs) = @_; |
|
|
577 | |
|
|
578 | #TODO: mon-less form? |
|
|
579 | |
|
|
580 | mon $port, sub { 0 && @refs } |
|
|
581 | } |
|
|
582 | |
|
|
583 | =item lnk $port1, $port2 |
|
|
584 | |
|
|
585 | =item lnk $otherport |
|
|
586 | |
|
|
587 | Link two ports. This is simply a shorthand for: |
|
|
588 | |
|
|
589 | mon $port1, $port2; |
|
|
590 | mon $port2, $port1; |
|
|
591 | |
|
|
592 | It means that if either one is killed abnormally, the other one gets |
|
|
593 | killed as well. |
|
|
594 | |
|
|
595 | The one-argument form assumes that one port is C<$SELF>. |
|
|
596 | |
|
|
597 | =cut |
|
|
598 | |
|
|
599 | sub lnk { |
|
|
600 | my $port1 = shift; |
|
|
601 | my $port2 = @_ ? shift : $SELF || Carp::croak 'lnk: called with one argument only, but $SELF not set,'; |
|
|
602 | |
|
|
603 | mon $port1, $port2; |
|
|
604 | mon $port2, $port1; |
|
|
605 | } |
|
|
606 | |
|
|
607 | =item kil $port[, @reason] |
|
|
608 | |
|
|
609 | Kill the specified port with the given C<@reason>. |
|
|
610 | |
|
|
611 | If no C<@reason> is specified, then the port is killed "normally" (linked |
|
|
612 | ports will not be kileld, or even notified). |
|
|
613 | |
|
|
614 | Otherwise, linked ports get killed with the same reason (second form of |
|
|
615 | C<mon>, see below). |
|
|
616 | |
|
|
617 | Runtime errors while evaluating C<rcv> callbacks or inside C<psub> blocks |
|
|
618 | will be reported as reason C<< die => $@ >>. |
|
|
619 | |
|
|
620 | Transport/communication errors are reported as C<< transport_error => |
|
|
621 | $message >>. |
|
|
622 | |
367 | =back |
623 | =back |
368 | |
624 | |
369 | =head1 NODE MESSAGES |
625 | =head1 NODE MESSAGES |
370 | |
626 | |
371 | Nodes understand the following messages sent to them: |
627 | Nodes understand the following messages sent to them. Many of them take |
|
|
628 | arguments called C<@reply>, which will simply be used to compose a reply |
|
|
629 | message - C<$reply[0]> is the port to reply to, C<$reply[1]> the type and |
|
|
630 | the remaining arguments are simply the message data. |
|
|
631 | |
|
|
632 | While other messages exist, they are not public and subject to change. |
372 | |
633 | |
373 | =over 4 |
634 | =over 4 |
374 | |
635 | |
375 | =cut |
636 | =cut |
376 | |
637 | |
377 | ############################################################################# |
638 | =item lookup => $name, @reply |
378 | # self node code |
|
|
379 | |
639 | |
380 | sub _new_port($) { |
640 | Replies with the port ID of the specified well-known port, or C<undef>. |
381 | my ($name) = @_; |
|
|
382 | |
641 | |
383 | my ($noderef, $portname) = split /#/, $name; |
642 | =item devnull => ... |
384 | |
643 | |
385 | $PORT{$name} = |
644 | Generic data sink/CPU heat conversion. |
386 | $PORT{$portname} = { |
|
|
387 | names => [$name, $portname], |
|
|
388 | }; |
|
|
389 | } |
|
|
390 | |
|
|
391 | $NODE{""} = new AnyEvent::MP::Node::Self noderef => $NODE; |
|
|
392 | _new_port ""; |
|
|
393 | |
645 | |
394 | =item relay => $port, @msg |
646 | =item relay => $port, @msg |
395 | |
647 | |
396 | Simply forwards the message to the given port. |
648 | Simply forwards the message to the given port. |
397 | |
649 | |
398 | =cut |
|
|
399 | |
|
|
400 | rcv "", relay => \&snd; |
|
|
401 | |
|
|
402 | =item eval => $string[ @reply] |
650 | =item eval => $string[ @reply] |
403 | |
651 | |
404 | Evaluates the given string. If C<@reply> is given, then a message of the |
652 | Evaluates the given string. If C<@reply> is given, then a message of the |
405 | form C<@reply, $@, @evalres> is sent (C<$reply[0]> is the port to reply to). |
653 | form C<@reply, $@, @evalres> is sent. |
406 | |
654 | |
407 | =cut |
655 | Example: crash another node. |
408 | |
656 | |
409 | rcv "", eval => sub { |
657 | snd $othernode, eval => "exit"; |
410 | my (undef, $string, @reply) = @_; |
|
|
411 | my @res = eval $string; |
|
|
412 | snd @reply, "$@", @res if @reply; |
|
|
413 | }; |
|
|
414 | |
658 | |
415 | =item time => @reply |
659 | =item time => @reply |
416 | |
660 | |
417 | Replies the the current node time to C<@reply>. |
661 | Replies the the current node time to C<@reply>. |
418 | |
662 | |
419 | =cut |
663 | Example: tell the current node to send the current time to C<$myport> in a |
|
|
664 | C<timereply> message. |
420 | |
665 | |
421 | rcv "", time => sub { shift; snd @_, AE::time }; |
666 | snd $NODE, time => $myport, timereply => 1, 2; |
|
|
667 | # => snd $myport, timereply => 1, 2, <time> |
|
|
668 | |
|
|
669 | =back |
|
|
670 | |
|
|
671 | =head1 AnyEvent::MP vs. Distributed Erlang |
|
|
672 | |
|
|
673 | AnyEvent::MP got lots of its ideas from distributed Erlang (Erlang node |
|
|
674 | == aemp node, Erlang process == aemp port), so many of the documents and |
|
|
675 | programming techniques employed by Erlang apply to AnyEvent::MP. Here is a |
|
|
676 | sample: |
|
|
677 | |
|
|
678 | http://www.Erlang.se/doc/programming_rules.shtml |
|
|
679 | http://Erlang.org/doc/getting_started/part_frame.html # chapters 3 and 4 |
|
|
680 | http://Erlang.org/download/Erlang-book-part1.pdf # chapters 5 and 6 |
|
|
681 | http://Erlang.org/download/armstrong_thesis_2003.pdf # chapters 4 and 5 |
|
|
682 | |
|
|
683 | Despite the similarities, there are also some important differences: |
|
|
684 | |
|
|
685 | =over 4 |
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|
686 | |
|
|
687 | =item * Node references contain the recipe on how to contact them. |
|
|
688 | |
|
|
689 | Erlang relies on special naming and DNS to work everywhere in the |
|
|
690 | same way. AEMP relies on each node knowing it's own address(es), with |
|
|
691 | convenience functionality. |
|
|
692 | |
|
|
693 | This means that AEMP requires a less tightly controlled environment at the |
|
|
694 | cost of longer node references and a slightly higher management overhead. |
|
|
695 | |
|
|
696 | =item * Erlang uses processes and a mailbox, AEMP does not queue. |
|
|
697 | |
|
|
698 | Erlang uses processes that selctively receive messages, and therefore |
|
|
699 | needs a queue. AEMP is event based, queuing messages would serve no useful |
|
|
700 | purpose. |
|
|
701 | |
|
|
702 | (But see L<Coro::MP> for a more Erlang-like process model on top of AEMP). |
|
|
703 | |
|
|
704 | =item * Erlang sends are synchronous, AEMP sends are asynchronous. |
|
|
705 | |
|
|
706 | Sending messages in Erlang is synchronous and blocks the process. AEMP |
|
|
707 | sends are immediate, connection establishment is handled in the |
|
|
708 | background. |
|
|
709 | |
|
|
710 | =item * Erlang can silently lose messages, AEMP cannot. |
|
|
711 | |
|
|
712 | Erlang makes few guarantees on messages delivery - messages can get lost |
|
|
713 | without any of the processes realising it (i.e. you send messages a, b, |
|
|
714 | and c, and the other side only receives messages a and c). |
|
|
715 | |
|
|
716 | AEMP guarantees correct ordering, and the guarantee that there are no |
|
|
717 | holes in the message sequence. |
|
|
718 | |
|
|
719 | =item * In Erlang, processes can be declared dead and later be found to be |
|
|
720 | alive. |
|
|
721 | |
|
|
722 | In Erlang it can happen that a monitored process is declared dead and |
|
|
723 | linked processes get killed, but later it turns out that the process is |
|
|
724 | still alive - and can receive messages. |
|
|
725 | |
|
|
726 | In AEMP, when port monitoring detects a port as dead, then that port will |
|
|
727 | eventually be killed - it cannot happen that a node detects a port as dead |
|
|
728 | and then later sends messages to it, finding it is still alive. |
|
|
729 | |
|
|
730 | =item * Erlang can send messages to the wrong port, AEMP does not. |
|
|
731 | |
|
|
732 | In Erlang it is quite possible that a node that restarts reuses a process |
|
|
733 | ID known to other nodes for a completely different process, causing |
|
|
734 | messages destined for that process to end up in an unrelated process. |
|
|
735 | |
|
|
736 | AEMP never reuses port IDs, so old messages or old port IDs floating |
|
|
737 | around in the network will not be sent to an unrelated port. |
|
|
738 | |
|
|
739 | =item * Erlang uses unprotected connections, AEMP uses secure |
|
|
740 | authentication and can use TLS. |
|
|
741 | |
|
|
742 | AEMP can use a proven protocol - SSL/TLS - to protect connections and |
|
|
743 | securely authenticate nodes. |
|
|
744 | |
|
|
745 | =item * The AEMP protocol is optimised for both text-based and binary |
|
|
746 | communications. |
|
|
747 | |
|
|
748 | The AEMP protocol, unlike the Erlang protocol, supports both |
|
|
749 | language-independent text-only protocols (good for debugging) and binary, |
|
|
750 | language-specific serialisers (e.g. Storable). |
|
|
751 | |
|
|
752 | It has also been carefully designed to be implementable in other languages |
|
|
753 | with a minimum of work while gracefully degrading fucntionality to make the |
|
|
754 | protocol simple. |
|
|
755 | |
|
|
756 | =item * AEMP has more flexible monitoring options than Erlang. |
|
|
757 | |
|
|
758 | In Erlang, you can chose to receive I<all> exit signals as messages |
|
|
759 | or I<none>, there is no in-between, so monitoring single processes is |
|
|
760 | difficult to implement. Monitoring in AEMP is more flexible than in |
|
|
761 | Erlang, as one can choose between automatic kill, exit message or callback |
|
|
762 | on a per-process basis. |
|
|
763 | |
|
|
764 | =item * Erlang has different semantics for monitoring and linking, AEMP has the same. |
|
|
765 | |
|
|
766 | Monitoring in Erlang is not an indicator of process death/crashes, |
|
|
767 | as linking is (except linking is unreliable in Erlang). In AEMP, the |
|
|
768 | semantics of monitoring and linking are identical, linking is simply |
|
|
769 | two-way monitoring with automatic kill. |
422 | |
770 | |
423 | =back |
771 | =back |
424 | |
772 | |
425 | =head1 SEE ALSO |
773 | =head1 SEE ALSO |
426 | |
774 | |