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<title>[12635] CalendarServer/trunk/calendarserver/webadmin/logs.py</title>
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<dt>Revision</dt> <dd><a href="http://trac.calendarserver.org//changeset/12635">12635</a></dd>
<dt>Author</dt> <dd>wsanchez@apple.com</dd>
<dt>Date</dt> <dd>2014-02-10 13:18:16 -0800 (Mon, 10 Feb 2014)</dd>
</dl>
<h3>Log Message</h3>
<pre>Try to stream, and fail</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#CalendarServertrunkcalendarserverwebadminlogspy">CalendarServer/trunk/calendarserver/webadmin/logs.py</a></li>
</ul>
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<div id="patch">
<h3>Diff</h3>
<a id="CalendarServertrunkcalendarserverwebadminlogspy"></a>
<div class="modfile"><h4>Modified: CalendarServer/trunk/calendarserver/webadmin/logs.py (12634 => 12635)</h4>
<pre class="diff"><span>
<span class="info">--- CalendarServer/trunk/calendarserver/webadmin/logs.py 2014-02-10 19:57:08 UTC (rev 12634)
+++ CalendarServer/trunk/calendarserver/webadmin/logs.py 2014-02-10 21:18:16 UTC (rev 12635)
</span><span class="lines">@@ -24,6 +24,8 @@
</span><span class="cx"> "LogEventsResource",
</span><span class="cx"> ]
</span><span class="cx">
</span><ins>+from collections import deque
+
</ins><span class="cx"> from zope.interface import implementer
</span><span class="cx">
</span><span class="cx"> from twisted.internet.defer import succeed
</span><span class="lines">@@ -33,6 +35,8 @@
</span><span class="cx"> from txweb2.http_headers import MimeType
</span><span class="cx"> from txweb2.http import Response
</span><span class="cx">
</span><ins>+from calendarserver.accesslog import CommonAccessLoggingObserverExtensions
+
</ins><span class="cx"> from .resource import PageElement, TemplateResource
</span><span class="cx">
</span><span class="cx">
</span><span class="lines">@@ -79,10 +83,12 @@
</span><span class="cx"> def __init__(self):
</span><span class="cx"> Resource.__init__(self)
</span><span class="cx">
</span><ins>+ self._observer = AccessLoggingObserver()
</ins><span class="cx">
</span><ins>+
</ins><span class="cx"> def render(self, request):
</span><span class="cx"> response = Response()
</span><del>- response.stream = LogObservingEventStream()
</del><ins>+ response.stream = LogObservingEventStream(self._observer)
</ins><span class="cx"> response.headers.setHeader(
</span><span class="cx"> "content-type", MimeType.fromString("text/event-stream")
</span><span class="cx"> )
</span><span class="lines">@@ -100,7 +106,11 @@
</span><span class="cx"> length = None
</span><span class="cx">
</span><span class="cx">
</span><del>- def __init__(self):
</del><ins>+ def __init__(self, observer, start=None):
+ object.__init__(self)
+
+ self._observer = observer
+ self._start = start
</ins><span class="cx"> self._closed = False
</span><span class="cx">
</span><span class="cx">
</span><span class="lines">@@ -108,9 +118,36 @@
</span><span class="cx"> if self._closed:
</span><span class="cx"> return None
</span><span class="cx">
</span><del>- return succeed(textAsEvent(u"Hello!"))
</del><ins>+ start = self._start
</ins><span class="cx">
</span><ins>+ events = []
</ins><span class="cx">
</span><ins>+ for message in self._observer.messages():
+ # If we have a start point, skip messages up to and including the
+ # one at the start point.
+ if start is not None:
+ if id(message) == start:
+ start = None
+ continue
+
+ events.append(textAsEvent(message))
+
+ if events:
+ # Remember the ID of the last event read at our start point
+ self._start = id(events[-1])
+
+ return succeed("".join(events))
+
+ if self._start is not None:
+ # We have a start point and no data... maybe if fell off of the
+ # buffer; remove the start point and try again.
+ self._start = None
+ return self.read()
+
+ # No start point and no events == EOF
+ return succeed(None)
+
+
</ins><span class="cx"> def split(self, point):
</span><span class="cx"> return fallbackSplit(self, point)
</span><span class="cx">
</span><span class="lines">@@ -120,5 +157,30 @@
</span><span class="cx">
</span><span class="cx">
</span><span class="cx">
</span><ins>+class AccessLoggingObserver(CommonAccessLoggingObserverExtensions):
+ """
+ Log observer that captures apache-style access log text entries in a
+ buffer.
+ """
+ def __init__(self):
+ CommonAccessLoggingObserverExtensions.__init__(self)
+
+ self._buffer = deque(maxlen=400)
+
+
+ def logMessage(self, message):
+ self._buffer.append(message)
+
+
+ def messages(self):
+ return iter(self._buffer)
+
+
+
</ins><span class="cx"> def textAsEvent(text):
</span><del>- return u"data: {text}\n\n".format(text=text).encode("utf-8")
</del><ins>+ return (
+ u"id: {id}\n"
+ u"data: {text}\n"
+ u"\n"
+ .format(id=id(text), text=text).encode("utf-8")
+ )
</ins></span></pre>
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