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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/1902/">https://reviewboard.asterisk.org/r/1902/</a>
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<p style="margin-top: 0;">On May 11th, 2012, 9:50 a.m., <b>Joshua Colp</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1902/diff/1/?file=27723#file27723line167" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/include/asterisk/bridging.h</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">struct ast_bridge_channel {</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/*! A list that acts as a FIFO queue of deferred callbacks to execute */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">AST_LIST_HEAD_NOLOCK</span><span class="p">(,</span><span class="n">bridge_deferred_callback</span><span class="p">)</span> <span class="n">deferds</span><span class="p">;</span></pre></td>
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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;">I'm not a huge fan of calling this 'deferds'. Perhaps 'deferred' instead?</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">"deferds" is definitely wrong, since "deferred" is spelled with two r's. How about deferreds? I prefer a plural form, since it may contain more then one deferred actions to execute.</pre>
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<p style="margin-top: 0;">On May 11th, 2012, 9:50 a.m., <b>Joshua Colp</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1902/diff/1/?file=27723#file27723line598" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/include/asterisk/bridging.h</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">int ast_bridge_is_video_src(struct ast_bridge *bridge, struct ast_channel *chan);</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * \param pvt_destructor Optional destructor for the private data</span></pre></td>
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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;">I would prefer that if optional data is passed that a destructor be required, doing so forces reinforces that the ownership is with the bridge. (Or if it shouldn't be with the bridge that a reference counted object is used).</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Sounds good to me. I'm hesitant to change bridge_channel_call_deferred to not check for the existence of the destructor callback before calling it on pvt_data, as I'd prefer a memory leak over a seg fault. I have gone ahead and updated it so that it will spit out a warning if pvt_data is defined but destructor_cb is not. Fixed.</pre>
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<p style="margin-top: 0;">On May 11th, 2012, 9:50 a.m., <b>Joshua Colp</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1902/diff/1/?file=27724#file27724line835" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/main/bridging.c</a>
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void bridge_channel_call_deferred(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">deferred</span> <span class="o">=</span> <span class="n">AST_LIST_FIRST</span><span class="p">(</span><span class="o">&</span><span class="n">bridge_channel</span><span class="o">-></span><span class="n">deferds</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="n">AST_LIST_REMOVE_HEAD</span><span class="p">(</span><span class="o">&</span><span class="n">bridge_channel</span><span class="o">-></span><span class="n">deferds</span><span class="p">,</span> <span class="n">entry</span><span class="p">);</span></pre></td>
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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;">You can actually just use AST_LIST_REMOVE_HEAD here as it returns the item removed.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Fixed</pre>
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<p style="margin-top: 0;">On May 11th, 2012, 9:50 a.m., <b>Joshua Colp</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1902/diff/1/?file=27724#file27724line839" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/main/bridging.c</a>
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void bridge_channel_call_deferred(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">deferred</span><span class="p">)</span> <span class="p">{</span></pre></td>
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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;">Is it actually possible for us to go into a deferred execution state without any deferred items? Reading the code it doesn't seem like it is possible.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Well, AST_LIST_REMOVE_HEAD can be executed on an empty list, so you aren't guaranteed that what the macro produces is non-NULL.
Taking the rest of the changes into account, you shouldn't currently be able to get in a situation where deferred is NULL. However, that doesn't mean that someone a year from now won't change ast_bridge_issue_deferred (or some other related part of the code), and suddenly it is possible to have a NULL item removed from the list. Another way this could occur is if someone changes the state of the bridged channel to AST_BRIDGE_CHANNEL_STATE_EXECUTE_DEFERRED in an unexpected way and this method gets called twice on a single deferred callback request. Again, shouldn't be possible, but checking that you got a valid object off a queue when multiple threads are involved with the manipulation of that object isn't a bad idea.</pre>
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<p style="margin-top: 0;">On May 11th, 2012, 9:50 a.m., <b>Joshua Colp</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1902/diff/1/?file=27724#file27724line1128" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/main/bridging.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static enum ast_bridge_channel_state bridge_channel_join(struct ast_bridge_channel *bridge_channel)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">AST_LIST_TRAVERSE_SAFE_BEGIN</span><span class="p">(</span><span class="o">&</span><span class="n">bridge_channel</span><span class="o">-></span><span class="n">deferds</span><span class="p">,</span> <span class="n">deferred</span><span class="p">,</span> <span class="n">entry</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="n">AST_LIST_REMOVE_CURRENT</span><span class="p">(</span><span class="n">entry</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="k">if</span> <span class="p">(</span><span class="n">deferred</span><span class="o">-></span><span class="n">pvt_destructor</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="n">deferred</span><span class="o">-></span><span class="n">pvt_destructor</span><span class="p">(</span><span class="n">deferred</span><span class="o">-></span><span class="n">pvt_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="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="n">ast_free</span><span class="p">(</span><span class="n">deferred</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="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="n">AST_LIST_TRAVERSE_SAFE_END</span><span class="p">;</span></pre></td>
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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;">You can turn this into a while loop using AST_LIST_REMOVE_HEAD.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Fixed</pre>
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<p style="margin-top: 0;">On May 11th, 2012, 9:50 a.m., <b>Joshua Colp</b> wrote:</p>
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">int ast_bridge_issue_deferred(struct ast_bridge *bridge,</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">AST_LIST_TRAVERSE</span><span class="p">(</span><span class="o">&</span><span class="n">bridge</span><span class="o">-></span><span class="n">channels</span><span class="p">,</span> <span class="n">bridge_channel</span><span class="p">,</span> <span class="n">entry</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1567</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">bridge_channel</span><span class="o">-></span><span class="n">chan</span> <span class="o">==</span> <span class="n">chan</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2"></font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1568</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ao2_lock</span><span class="p">(</span><span class="n">bridge_channel</span><span class="p">);</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2"></font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1569</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">AST_LIST_INSERT_TAIL</span><span class="p">(</span><span class="o">&</span><span class="n">bridge_channel</span><span class="o">-></span><span class="n">deferds</span><span class="p">,</span> <span class="n">deferred</span><span class="p">,</span> <span class="n">entry</span><span class="p">);</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2"></font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1570</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ao2_unlock</span><span class="p">(</span><span class="n">bridge_channel</span><span class="p">);</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2"></font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1571</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_bridge_change_state</span><span class="p">(</span><span class="n">bridge_channel</span><span class="p">,</span> <span class="n">AST_BRIDGE_CHANNEL_STATE_EXECUTE_DEFERRED</span><span class="p">);</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2"></font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1572</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">res</span> <span class="o">=</span> <span class="mi">0</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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1573</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">break</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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1574</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1575</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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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;">Use find_bridge_channel</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Fixed</pre>
<br />
<p>- Matt</p>
<br />
<p>On May 5th, 2012, 11:50 p.m., Matt Jordan wrote:</p>
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<div>Review request for Asterisk Developers and Joshua Colp.</div>
<div>By Matt Jordan.</div>
<p style="color: grey;"><i>Updated May 5, 2012, 11:50 p.m.</i></p>
<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;">Currently, most actions that are executed upon a channel in a conference (increasing/decreasing listening volume, playing back a sound on a channel, etc.) are handled via DTMF menus associated with a user profile. While this suffices for scenarios where a user initiates an action upon themselves, it does not account for scenarios where a third party application wants to interact with the channels in a ConfBridge. While there are a handful of AMI commands that allow for external interaction with the channels in the conference, they are currently limited to a subset of the defined actions.
Rather then add individual AMI commands for each confbridge action, this patch adds a single new AMI command for ConfBridge, ConfbridgeActionExec. The command lets you execute any of the ConfBridge actions on a channel in the conference.
In order to facilitate this, a new mechanism has been added to the bridging layer to allow for a callback function to be executed at the next convenient moment on a bridged channel's thread. This lets a user of the bridging layer defer execution of some function until such a time that the bridging layer determines that it is safe to execute that action on the channel's thread.
Example Usage:
Action: ConfbridgeActionExec
Conference: 1
Channel: Local/blah@foo
Actions: increase_listening_volume,playback(tt-monkeys)
This would playback monkeys to the offending channel. Very loudly.</pre>
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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;">Initial testing using a test in the Asterisk Test Suite verified proper behavior of the AMI command. The channel was properly suspended from the bridging layer, the playback confbridge action was executed, and the channel was placed back into the bridging layer. All of this was similar to what would occur if the same action was triggered using a DTMF menu.
Note that a test case is being written to handle the various actions, but will be posted under a separate review.</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/CHANGES <span style="color: grey">(364579)</span></li>
<li>/trunk/apps/app_confbridge.c <span style="color: grey">(364788)</span></li>
<li>/trunk/main/bridging.c <span style="color: grey">(364579)</span></li>
<li>/trunk/apps/confbridge/conf_config_parser.c <span style="color: grey">(364579)</span></li>
<li>/trunk/apps/confbridge/include/confbridge.h <span style="color: grey">(364579)</span></li>
<li>/trunk/include/asterisk/bridging.h <span style="color: grey">(364579)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/1902/diff/" style="margin-left: 3em;">View Diff</a></p>
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