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| 4 | |
4 | |
| 5 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
| 6 | |
6 | |
| 7 | use AnyEvent::MP; |
7 | use AnyEvent::MP; |
| 8 | |
8 | |
| 9 | $NODE # contains this node's noderef |
9 | $NODE # contains this node's node ID |
| 10 | NODE # returns this node's noderef |
10 | NODE # returns this node's node ID |
| 11 | NODE $port # returns the noderef of the port |
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| 12 | |
11 | |
| 13 | $SELF # receiving/own port id in rcv callbacks |
12 | $SELF # receiving/own port id in rcv callbacks |
| 14 | |
13 | |
| 15 | # initialise the node so it can send/receive messages |
14 | # initialise the node so it can send/receive messages |
| 16 | initialise_node; |
15 | configure; |
| 17 | |
16 | |
| 18 | # ports are message endpoints |
17 | # ports are message destinations |
| 19 | |
18 | |
| 20 | # sending messages |
19 | # sending messages |
| 21 | snd $port, type => data...; |
20 | snd $port, type => data...; |
| 22 | snd $port, @msg; |
21 | snd $port, @msg; |
| 23 | snd @msg_with_first_element_being_a_port; |
22 | snd @msg_with_first_element_being_a_port; |
| 24 | |
23 | |
| 25 | # creating/using ports, the simple way |
24 | # creating/using ports, the simple way |
| 26 | my $simple_port = port { my @msg = @_; 0 }; |
25 | my $simple_port = port { my @msg = @_ }; |
| 27 | |
26 | |
| 28 | # creating/using ports, tagged message matching |
27 | # creating/using ports, tagged message matching |
| 29 | my $port = port; |
28 | my $port = port; |
| 30 | rcv $port, ping => sub { snd $_[0], "pong"; 0 }; |
29 | rcv $port, ping => sub { snd $_[0], "pong" }; |
| 31 | rcv $port, pong => sub { warn "pong received\n"; 0 }; |
30 | rcv $port, pong => sub { warn "pong received\n" }; |
| 32 | |
31 | |
| 33 | # create a port on another node |
32 | # create a port on another node |
| 34 | my $port = spawn $node, $initfunc, @initdata; |
33 | my $port = spawn $node, $initfunc, @initdata; |
| 35 | |
34 | |
| 36 | # monitoring |
35 | # monitoring |
| … | |
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| 138 | |
137 | |
| 139 | our $VERSION = $AnyEvent::MP::Kernel::VERSION; |
138 | our $VERSION = $AnyEvent::MP::Kernel::VERSION; |
| 140 | |
139 | |
| 141 | our @EXPORT = qw( |
140 | our @EXPORT = qw( |
| 142 | NODE $NODE *SELF node_of after |
141 | NODE $NODE *SELF node_of after |
| 143 | initialise_node |
142 | configure |
| 144 | snd rcv mon mon_guard kil reg psub spawn |
143 | snd rcv mon mon_guard kil reg psub spawn |
| 145 | port |
144 | port |
| 146 | ); |
145 | ); |
| 147 | |
146 | |
| 148 | our $SELF; |
147 | our $SELF; |
| … | |
… | |
| 155 | |
154 | |
| 156 | =item $thisnode = NODE / $NODE |
155 | =item $thisnode = NODE / $NODE |
| 157 | |
156 | |
| 158 | The C<NODE> function returns, and the C<$NODE> variable contains, the node |
157 | The C<NODE> function returns, and the C<$NODE> variable contains, the node |
| 159 | ID of the node running in the current process. This value is initialised by |
158 | ID of the node running in the current process. This value is initialised by |
| 160 | a call to C<initialise_node>. |
159 | a call to C<configure>. |
| 161 | |
160 | |
| 162 | =item $nodeid = node_of $port |
161 | =item $nodeid = node_of $port |
| 163 | |
162 | |
| 164 | Extracts and returns the node ID from a port ID or a node ID. |
163 | Extracts and returns the node ID from a port ID or a node ID. |
| 165 | |
164 | |
| 166 | =item initialise_node $profile_name, key => value... |
165 | =item configure key => value... |
| 167 | |
166 | |
| 168 | Before a node can talk to other nodes on the network (i.e. enter |
167 | Before a node can talk to other nodes on the network (i.e. enter |
| 169 | "distributed mode") it has to initialise itself - the minimum a node needs |
168 | "distributed mode") it has to configure itself - the minimum a node needs |
| 170 | to know is its own name, and optionally it should know the addresses of |
169 | to know is its own name, and optionally it should know the addresses of |
| 171 | some other nodes in the network to discover other nodes. |
170 | some other nodes in the network to discover other nodes. |
| 172 | |
171 | |
| 173 | This function initialises a node - it must be called exactly once (or |
172 | This function configures a node - it must be called exactly once (or |
| 174 | never) before calling other AnyEvent::MP functions. |
173 | never) before calling other AnyEvent::MP functions. |
| 175 | |
174 | |
| 176 | The first argument is a profile name. If it is C<undef> or missing, then |
175 | =over 4 |
| 177 | the current nodename will be used instead (i.e. F<uname -n>). |
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| 178 | |
176 | |
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177 | =item step 1, gathering configuration from profiles |
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178 | |
| 179 | The function first looks up the profile in the aemp configuration (see the |
179 | The function first looks up a profile in the aemp configuration (see the |
| 180 | L<aemp> commandline utility). the profile is calculated as follows: |
180 | L<aemp> commandline utility). The profile name can be specified via the |
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181 | named C<profile> parameter. If it is missing, then the nodename (F<uname |
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182 | -n>) will be used as profile name. |
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183 | |
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184 | The profile data is then gathered as follows: |
| 181 | |
185 | |
| 182 | First, all remaining key => value pairs (all of which are conviniently |
186 | First, all remaining key => value pairs (all of which are conviniently |
| 183 | undocumented at the moment) will be used. Then they will be overwritten by |
187 | undocumented at the moment) will be interpreted as configuration |
| 184 | any values specified in the global default configuration (see the F<aemp> |
188 | data. Then they will be overwritten by any values specified in the global |
| 185 | utility), then the chain of profiles selected, if any. That means that |
189 | default configuration (see the F<aemp> utility), then the chain of |
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190 | profiles chosen by the profile name (and any C<parent> attributes). |
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191 | |
| 186 | the values specified in the profile have highest priority and the values |
192 | That means that the values specified in the profile have highest priority |
| 187 | specified via C<initialise_node> have lowest priority. |
193 | and the values specified directly via C<configure> have lowest priority, |
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194 | and can only be used to specify defaults. |
| 188 | |
195 | |
| 189 | If the profile specifies a node ID, then this will become the node ID of |
196 | If the profile specifies a node ID, then this will become the node ID of |
| 190 | this process. If not, then the profile name will be used as node ID. The |
197 | this process. If not, then the profile name will be used as node ID. The |
| 191 | special node ID of C<anon/> will be replaced by a random node ID. |
198 | special node ID of C<anon/> will be replaced by a random node ID. |
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199 | |
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200 | =item step 2, bind listener sockets |
| 192 | |
201 | |
| 193 | The next step is to look up the binds in the profile, followed by binding |
202 | The next step is to look up the binds in the profile, followed by binding |
| 194 | aemp protocol listeners on all binds specified (it is possible and valid |
203 | aemp protocol listeners on all binds specified (it is possible and valid |
| 195 | to have no binds, meaning that the node cannot be contacted form the |
204 | to have no binds, meaning that the node cannot be contacted form the |
| 196 | outside. This means the node cannot talk to other nodes that also have no |
205 | outside. This means the node cannot talk to other nodes that also have no |
| 197 | binds, but it can still talk to all "normal" nodes). |
206 | binds, but it can still talk to all "normal" nodes). |
| 198 | |
207 | |
| 199 | If the profile does not specify a binds list, then a default of C<*> is |
208 | If the profile does not specify a binds list, then a default of C<*> is |
| 200 | used. |
209 | used, meaning the node will bind on a dynamically-assigned port on every |
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210 | local IP address it finds. |
| 201 | |
211 | |
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212 | =item step 3, connect to seed nodes |
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213 | |
| 202 | Lastly, the seeds list from the profile is passed to the |
214 | As the last step, the seeds list from the profile is passed to the |
| 203 | L<AnyEvent::MP::Global> module, which will then use it to keep |
215 | L<AnyEvent::MP::Global> module, which will then use it to keep |
| 204 | connectivity with at least on of those seed nodes at any point in time. |
216 | connectivity with at least one node at any point in time. |
| 205 | |
217 | |
| 206 | Example: become a distributed node listening on the guessed noderef, or |
218 | =back |
| 207 | the one specified via C<aemp> for the current node. This should be the |
219 | |
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220 | Example: become a distributed node using the locla node name as profile. |
| 208 | most common form of invocation for "daemon"-type nodes. |
221 | This should be the most common form of invocation for "daemon"-type nodes. |
| 209 | |
222 | |
| 210 | initialise_node; |
223 | configure |
| 211 | |
224 | |
| 212 | Example: become an anonymous node. This form is often used for commandline |
225 | Example: become an anonymous node. This form is often used for commandline |
| 213 | clients. |
226 | clients. |
| 214 | |
227 | |
| 215 | initialise_node "anon/"; |
228 | configure nodeid => "anon/"; |
| 216 | |
229 | |
| 217 | Example: become a distributed node. If there is no profile of the given |
230 | Example: configure a node using a profile called seed, which si suitable |
| 218 | name, or no binds list was specified, resolve C<localhost:4044> and bind |
231 | for a seed node as it binds on all local addresses on a fixed port (4040, |
| 219 | on the resulting addresses. |
232 | customary for aemp). |
| 220 | |
233 | |
| 221 | initialise_node "localhost:4044"; |
234 | # use the aemp commandline utility |
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235 | # aemp profile seed nodeid anon/ binds '*:4040' |
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236 | |
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237 | # then use it |
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238 | configure profile => "seed"; |
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239 | |
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240 | # or simply use aemp from the shell again: |
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241 | # aemp run profile seed |
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242 | |
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243 | # or provide a nicer-to-remember nodeid |
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244 | # aemp run profile seed nodeid "$(hostname)" |
| 222 | |
245 | |
| 223 | =item $SELF |
246 | =item $SELF |
| 224 | |
247 | |
| 225 | Contains the current port id while executing C<rcv> callbacks or C<psub> |
248 | Contains the current port id while executing C<rcv> callbacks or C<psub> |
| 226 | blocks. |
249 | blocks. |
| … | |
… | |
| 348 | |
371 | |
| 349 | =cut |
372 | =cut |
| 350 | |
373 | |
| 351 | sub rcv($@) { |
374 | sub rcv($@) { |
| 352 | my $port = shift; |
375 | my $port = shift; |
| 353 | my ($noderef, $portid) = split /#/, $port, 2; |
376 | my ($nodeid, $portid) = split /#/, $port, 2; |
| 354 | |
377 | |
| 355 | $NODE{$noderef} == $NODE{""} |
378 | $NODE{$nodeid} == $NODE{""} |
| 356 | or Carp::croak "$port: rcv can only be called on local ports, caught"; |
379 | or Carp::croak "$port: rcv can only be called on local ports, caught"; |
| 357 | |
380 | |
| 358 | while (@_) { |
381 | while (@_) { |
| 359 | if (ref $_[0]) { |
382 | if (ref $_[0]) { |
| 360 | if (my $self = $PORT_DATA{$portid}) { |
383 | if (my $self = $PORT_DATA{$portid}) { |
| … | |
… | |
| 500 | mon $port, $self => "restart"; |
523 | mon $port, $self => "restart"; |
| 501 | |
524 | |
| 502 | =cut |
525 | =cut |
| 503 | |
526 | |
| 504 | sub mon { |
527 | sub mon { |
| 505 | my ($noderef, $port) = split /#/, shift, 2; |
528 | my ($nodeid, $port) = split /#/, shift, 2; |
| 506 | |
529 | |
| 507 | my $node = $NODE{$noderef} || add_node $noderef; |
530 | my $node = $NODE{$nodeid} || add_node $nodeid; |
| 508 | |
531 | |
| 509 | my $cb = @_ ? shift : $SELF || Carp::croak 'mon: called with one argument only, but $SELF not set,'; |
532 | my $cb = @_ ? shift : $SELF || Carp::croak 'mon: called with one argument only, but $SELF not set,'; |
| 510 | |
533 | |
| 511 | unless (ref $cb) { |
534 | unless (ref $cb) { |
| 512 | if (@_) { |
535 | if (@_) { |
| … | |
… | |
| 626 | }; |
649 | }; |
| 627 | _self_die if $@; |
650 | _self_die if $@; |
| 628 | } |
651 | } |
| 629 | |
652 | |
| 630 | sub spawn(@) { |
653 | sub spawn(@) { |
| 631 | my ($noderef, undef) = split /#/, shift, 2; |
654 | my ($nodeid, undef) = split /#/, shift, 2; |
| 632 | |
655 | |
| 633 | my $id = "$RUNIQ." . $ID++; |
656 | my $id = "$RUNIQ." . $ID++; |
| 634 | |
657 | |
| 635 | $_[0] =~ /::/ |
658 | $_[0] =~ /::/ |
| 636 | or Carp::croak "spawn init function must be a fully-qualified name, caught"; |
659 | or Carp::croak "spawn init function must be a fully-qualified name, caught"; |
| 637 | |
660 | |
| 638 | snd_to_func $noderef, "AnyEvent::MP::_spawn" => $id, @_; |
661 | snd_to_func $nodeid, "AnyEvent::MP::_spawn" => $id, @_; |
| 639 | |
662 | |
| 640 | "$noderef#$id" |
663 | "$nodeid#$id" |
| 641 | } |
664 | } |
| 642 | |
665 | |
| 643 | =item after $timeout, @msg |
666 | =item after $timeout, @msg |
| 644 | |
667 | |
| 645 | =item after $timeout, $callback |
668 | =item after $timeout, $callback |
