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This is an automatically generated e-mail. To reply, visit:
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Do you have any ideas on how this will effect CPU load?
I was thinking of this as an example:
A system with 1 inbound call per second, each call lasting 5 minutes. Every inbound channel gets a 60 second timer for beep Playback (assume the timer runs 5 times). The inbound channel then dials outbound. You would reach about 600 concurrent "real" channels (300 in, 300 out), 2 real channels created and destroyed every second.
Of the 300 timers on inbound channels, 5 will fire every second. This means 10 local channels are created and destroyed every second. This gives us a total of 610 concurrent channels, 12 channels created and destroyed every second. I know channel creation/destruction isn't a lightweight operation, but I don't know if it will have a big impact overall.</pre>
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<a href="https://reviewboard.asterisk.org/r/3362/diff/4/?file=56930#file56930line54" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/funcs/func_periodic_hook.c</a>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><parameter name="interval" required="true"></span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><para>(On Read) Number of seconds in between hook runs.</para></span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span></parameter></span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Need to document and enforce a minimum interval. Also need to document that interval is whole seconds only.</pre>
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<a href="https://reviewboard.asterisk.org/r/3362/diff/4/?file=56930#file56930line68" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/funcs/func_periodic_hook.c</a>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><para>It is important to note that the hook does not actually</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span>run on the channel itself. It runs asynchronously on a new channel.</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span>Any audio generated by the hook gets injected into the call for</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span>the channel PERIODIC_HOOK() was set on.</para></span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Can we get a documented variable for the original channel name or uniqueid? I'd prefer something defined by this module (so not SPY_CHANNEL).</pre>
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<a href="https://reviewboard.asterisk.org/r/3362/diff/4/?file=56930#file56930line133" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/funcs/func_periodic_hook.c</a>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="n">ast_pbx_outgoing_exten</span><span class="p">(</span><span class="s">"Local"</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">,</span> <span class="n">FULL_EXTEN_NAME</span><span class="p">,</span> <span class="mi">60</span><span class="p">,</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">state->interval could be added to hook_thread_arg so we can use it for dial timeout.</pre>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="k">if</span> <span class="p">(</span><span class="n">ast_tvdiff_ms</span><span class="p">(</span><span class="n">now</span><span class="p">,</span> <span class="n">state</span><span class="o">-></span><span class="n">last_hook</span><span class="p">)</span> <span class="o">></span> <span class="n">state</span><span class="o">-></span><span class="n">interval</span> <span class="o">*</span> <span class="mi">1000</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">state->last_hook is never pre-initialized to ast_tvnow(), so hooks would always trigger on first check after being created or re-enabled. Unless this behaviour is documented I would expect the first run after create or resume to be delayed state->interval seconds.</pre>
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<a href="https://reviewboard.asterisk.org/r/3362/diff/4/?file=56930#file56930line207" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/funcs/func_periodic_hook.c</a>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="p">(</span><span class="n">res</span> <span class="o">=</span> <span class="n">do_hook</span><span class="p">(</span><span class="n">chan</span><span class="p">,</span> <span class="n">state</span><span class="p">)))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="n">state</span><span class="o">-></span><span class="n">last_hook</span> <span class="o">=</span> <span class="n">now</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="p">}</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">If do_hook fails we should log an error but still update state->last_hook. Otherwise we would try running do_hook for every audio frame until it succeeds.</pre>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="k">static</span> <span class="kt">int</span> <span class="nf">hook_on</span><span class="p">(</span><span class="k">struct</span> <span class="n">ast_channel</span> <span class="o">*</span><span class="n">chan</span><span class="p">,</span> <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">data</span><span class="p">,</span> <span class="kt">int</span> <span class="n">hook_id</span><span class="p">)</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This confused me for a minute, hook_on is run when the hook is created, hook_re_enable is called when someone writes "on".</pre>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="k">if</span> <span class="p">(</span><span class="n">sscanf</span><span class="p">(</span><span class="n">args</span><span class="p">.</span><span class="n">interval</span><span class="p">,</span> <span class="s">"%u"</span><span class="p">,</span> <span class="o">&</span><span class="n">interval</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">1</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Need checks for !ast_strlen_zero on all args. Maybe also a verify the exten@context exists?</pre>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="n">state</span><span class="o">-></span><span class="n">disabled</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Can we detach the audio hook here? I know we escape the hook callback very early but it still feels wasteful to keep it enabled.
Possibly remove state->disabled variable?</pre>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Check for NULL chan here.</pre>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Check for NULL chan here too</pre>
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<a href="https://reviewboard.asterisk.org/r/3362/diff/4/?file=56930#file56930line345" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/funcs/func_periodic_hook.c</a>
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(Diff revision 4)
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">strcasecmp</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="s">"off"</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="n">res</span> <span class="o">=</span> <span class="n">hook_off</span><span class="p">(</span><span class="n">chan</span><span class="p">,</span> <span class="n">data</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">strcasecmp</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="s">"on"</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="n">res</span> <span class="o">=</span> <span class="n">hook_re_enable</span><span class="p">(</span><span class="n">chan</span><span class="p">,</span> <span class="n">data</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="p">}</span> <span class="k">else</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="n">ast_log</span><span class="p">(</span><span class="n">LOG_WARNING</span><span class="p">,</span> <span class="s">"Invalid value for PERIODIC_HOOK function: '%s'"</span><span class="p">,</span> <span class="n">value</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="n">res</span> <span class="o">=</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="p">}</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Should we have an option to delete a hook? Something to free all memory from a periodic_hook that will not be used again.</pre>
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<a href="https://reviewboard.asterisk.org/r/3362/diff/4/?file=56930#file56930line368" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/funcs/func_periodic_hook.c</a>
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(Diff revision 4)
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="n">ast_context_destroy</span><span class="p">(</span><span class="n">func_periodic_hook_context</span><span class="p">,</span> <span class="s">"func_periodic_hook"</span><span class="p">);</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">AST_MODULE for registrar?</pre>
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<a href="https://reviewboard.asterisk.org/r/3362/diff/4/?file=56930#file56930line379" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/funcs/func_periodic_hook.c</a>
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(Diff revision 4)
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="n">CONTEXT_NAME</span><span class="p">,</span> <span class="s">"func_beep"</span><span class="p">);</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">AST_MODULE for registrar?</pre>
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<a href="https://reviewboard.asterisk.org/r/3362/diff/4/?file=56930#file56930line394" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/funcs/func_periodic_hook.c</a>
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(Diff revision 4)
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="n">ast_add_extension</span><span class="p">(</span><span class="n">CONTEXT_NAME</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="n">EXTEN_NAME</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="s">""</span><span class="p">,</span> <span class="s">""</span><span class="p">,</span> <span class="s">"ExecIf"</span><span class="p">,</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="s">"$[${GROUP_COUNT(${EncodedChannel}@whisper-channel)} > 1]?Hangup()"</span><span class="p">,</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="nb">NULL</span><span class="p">,</span> <span class="s">"func_periodic_hook"</span><span class="p">);</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Is this due to a technical limitation of ChanSpy? If not we should incorporate hook_id into the group variable so we limit 1 channel per hook_id.
Maybe add to documentation that a timer interval will be skipped if the channel from the previous interval hasn't ended.</pre>
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<p>- Corey Farrell</p>
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<p>On March 29th, 2014, 4:27 p.m. EDT, Russell Bryant wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By Russell Bryant.</div>
<p style="color: grey;"><i>Updated March 29, 2014, 4:27 p.m.</i></p>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
Asterisk
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"> This commit introduces a new dialplan function, PERIODIC_HOOK().
It allows you run to a dialplan hook on a channel periodically. The
original use case that inspired this was the ability to play a beep
periodically into a call being recorded. The implementation is much
more generic though and could be used for many other things.
The implementation makes heavy use of existing Asterisk components.
It uses a combination of Local channels and ChanSpy() to run some
custom dialplan and inject any audio it generates into an active call.
The other important bit of the implementation is how it figures out
when to trigger the beep playback. This implementation uses the
audiohook API, even though it's not actually touching the audio in any
way. It's a convenient way to get a callback and check if it's time
to kick off another beep. It would be nice if this was timer event
based instead of polling based, but unfortunately I don't see a way to
do it that won't interfere with other things.
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Called the following extension (100@test), both letting it run all the way through, as well as hanging up at various points in the middle.
[hooks]
exten => beep,1,Answer()
same => n,Playback(beep)
[test]
exten => 100,1,Answer()
same => n,Set(BEEP_ID=${PERIODIC_HOOK(hooks,beep,5)})
same => n,Wait(20)
same => n,Set(PERIODIC_HOOK(${BEEP_ID})=off)
same => n,Wait(20)
same => n,Set(PERIODIC_HOOK(${BEEP_ID})=on)
same => n,Wait(20)
same => n,Hangup()
</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/trunk/funcs/func_periodic_hook.c <span style="color: grey">(PRE-CREATION)</span></li>
<li>/trunk/CHANGES <span style="color: grey">(411572)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/3362/diff/" style="margin-left: 3em;">View Diff</a></p>
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