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<title>6.29.5.5 SocketHandler</title>
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<H3><A NAME="SECTION0082955000000000000000">
6.29.5.5 SocketHandler</A>
</H3>

<P>
The <tt class="class">SocketHandler</tt> class sends logging output to a network
socket. The base class uses a TCP socket.

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><span class="typelabel">class</span>&nbsp;<tt id='l2h-2519' xml:id='l2h-2519' class="class">SocketHandler</tt></b>(</nobr></td>
  <td><var>host, port</var>)</td></tr></table></dt>
<dd>
Returns a new instance of the <tt class="class">SocketHandler</tt> class intended to
communicate with a remote machine whose address is given by <var>host</var>
and <var>port</var>.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-2520' xml:id='l2h-2520' class="method">close</tt></b>(</nobr></td>
  <td><var></var>)</td></tr></table></dt>
<dd>
Closes the socket.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-2521' xml:id='l2h-2521' class="method">handleError</tt></b>(</nobr></td>
  <td><var></var>)</td></tr></table></dt>
<dd>
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-2522' xml:id='l2h-2522' class="method">emit</tt></b>(</nobr></td>
  <td><var></var>)</td></tr></table></dt>
<dd>
Pickles the record's attribute dictionary and writes it to the socket in
binary format. If there is an error with the socket, silently drops the
packet. If the connection was previously lost, re-establishes the connection.
To unpickle the record at the receiving end into a <tt class="class">LogRecord</tt>, use the
<tt class="function">makeLogRecord()</tt> function.
</dl>

<P>
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  <td><nobr><b><tt id='l2h-2523' xml:id='l2h-2523' class="method">handleError</tt></b>(</nobr></td>
  <td><var></var>)</td></tr></table></dt>
<dd>
Handles an error which has occurred during <tt class="method">emit()</tt>. The
most likely cause is a lost connection. Closes the socket so that
we can retry on the next event.
</dl>

<P>
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  <td><nobr><b><tt id='l2h-2524' xml:id='l2h-2524' class="method">makeSocket</tt></b>(</nobr></td>
  <td><var></var>)</td></tr></table></dt>
<dd>
This is a factory method which allows subclasses to define the precise
type of socket they want. The default implementation creates a TCP
socket (<tt class="constant">socket.SOCK_STREAM</tt>).
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-2525' xml:id='l2h-2525' class="method">makePickle</tt></b>(</nobr></td>
  <td><var>record</var>)</td></tr></table></dt>
<dd>
Pickles the record's attribute dictionary in binary format with a length
prefix, and returns it ready for transmission across the socket.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-2526' xml:id='l2h-2526' class="method">send</tt></b>(</nobr></td>
  <td><var>packet</var>)</td></tr></table></dt>
<dd>
Send a pickled string <var>packet</var> to the socket. This function allows
for partial sends which can happen when the network is busy.
</dl>

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<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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