From b74c985614caa336fdb1b956df5b1af69cdf8f85 Mon Sep 17 00:00:00 2001
From: Rob Hudson
Date: Mon, 8 Sep 2008 11:23:20 -0700
Subject: I forgot to really *add* the cache stats panel by David Cramer.

---
 debug_toolbar/panels/cache.py                      | 102 +++++++++++++++++++++
 .../templates/debug_toolbar/panels/cache.html      |  54 +++++++++++
 2 files changed, 156 insertions(+)
 create mode 100644 debug_toolbar/panels/cache.py
 create mode 100644 debug_toolbar/templates/debug_toolbar/panels/cache.html

(limited to 'debug_toolbar')

diff --git a/debug_toolbar/panels/cache.py b/debug_toolbar/panels/cache.py
new file mode 100644
index 0000000..fa6bdd0
--- /dev/null
+++ b/debug_toolbar/panels/cache.py
@@ -0,0 +1,102 @@
+import time
+import inspect
+try: 
+    from cStringIO import StringIO
+except ImportError: 
+    import StringIO
+from django.core import cache
+from django.core.cache.backends.base import BaseCache
+from django.template.loader import render_to_string
+from debug_toolbar.panels import DebugPanel
+
+class CacheStatTracker(BaseCache):
+    """A small class used to track cache calls."""
+    def __init__(self, cache):
+        self.cache = cache
+        self.reset()
+
+    def reset(self):
+        self.calls = []
+        self.hits = 0
+        self.misses = 0
+        self.sets = 0
+        self.gets = 0
+        self.get_many = 0
+        self.deletes = 0
+        self.total_time = 0
+
+    def _get_func_info(self):
+        stack = inspect.stack()[2]
+        return (stack[1], stack[2], stack[3], stack[4])
+
+    def get(self, key, default=None):
+        t = time.time()
+        value = self.cache.get(key, default)
+        this_time = time.time() - t
+        self.total_time += this_time * 1000
+        if value is None:
+            self.misses += 1
+        else:
+            self.hits += 1
+        self.gets += 1
+        self.calls.append((this_time, 'get', (key,), self._get_func_info()))
+        return value
+
+    def set(self, key, value, timeout=None):
+        t = time.time()
+        self.cache.set(key, value, timeout)
+        this_time = time.time() - t
+        self.total_time += this_time * 1000
+        self.sets += 1
+        self.calls.append((this_time, 'set', (key, value, timeout), self._get_func_info()))
+
+    def delete(self, key):
+        t = time.time()
+        self.instance.delete(key, value)
+        this_time = time.time() - t
+        self.total_time += this_time * 1000
+        self.deletes += 1
+        self.calls.append((this_time, 'delete', (key,), self._get_func_info()))
+
+    def get_many(self, keys):
+        t = time.time()
+        results = self.cache.get_many(keys)
+        this_time = time.time() - t
+        self.total_time += this_time * 1000
+        self.get_many += 1
+        for key, value in results.iteritems():
+            if value is None:
+                self.misses += 1
+            else:
+                self.hits += 1
+        self.calls.append((this_time, 'get_many', (keys,), self._get_func_info()))
+
+class CacheDebugPanel(DebugPanel):
+    """
+    Panel that displays the cache statistics.
+    """
+    name = 'Cache'
+
+    def __init__(self, request):
+        # This is hackish but to prevent threading issues is somewhat needed
+        if isinstance(cache.cache, CacheStatTracker):
+            cache.cache.reset()
+            self.cache = cache.cache
+        else:
+            self.cache = CacheStatTracker(cache.cache)
+            cache.cache = self.cache
+        super(CacheDebugPanel, self).__init__(request)
+
+    def title(self):
+        return 'Cache: %.2fms' % self.cache.total_time
+
+    def url(self):
+        return ''
+
+    def content(self):
+        context = dict(
+            cache_calls = len(self.cache.calls),
+            cache_time = self.cache.total_time,
+            cache = self.cache,
+        )
+        return render_to_string('debug_toolbar/panels/cache.html', context)
\ No newline at end of file
diff --git a/debug_toolbar/templates/debug_toolbar/panels/cache.html b/debug_toolbar/templates/debug_toolbar/panels/cache.html
new file mode 100644
index 0000000..9d51404
--- /dev/null
+++ b/debug_toolbar/templates/debug_toolbar/panels/cache.html
@@ -0,0 +1,54 @@
+<h3>Cache Usage</h3>
+<table>
+	<colgroup>
+		<col width="12%"/>
+		<col width="12%"/>
+		<col width="12%"/>
+		<col width="12%"/>
+		<col width="12%"/>
+		<col width="12%"/>
+		<col width="12%"/>
+		<col width="12%"/>
+	</colgroup>
+	<tr>
+		<th>Total Calls</th>
+		<td>{{ cache_calls }}</td>
+		<th>Total Time</th>
+		<td>{{ cache_time }}</td>
+		<th>Hits</th>
+		<td>{{ cache.hits }}</td>
+		<th>Misses</th>
+		<td>{{ cache.misses }}</td>
+	</tr>
+	<tr>
+		<th>gets</th>
+		<td>{{ cache.gets }}</td>
+		<th>sets</th>
+		<td>{{ cache.sets }}</td>
+		<th>deletes</th>
+		<td>{{ cache.deletes }}</td>
+		<th>get_many</th>
+		<td>{{ cache.get_many }}</td>
+	</tr>
+</table>
+<h3>Breakdown</h3>
+<table>
+	<thead>
+		<tr>
+			<th>Time&nbsp;(ms)</th>
+			<th>Type</th>
+			<th>Parameters</th>
+			<th>Function</th>
+		</tr>
+	</thead>
+	<tbody>
+		{% for query in cache.calls %}
+			<tr class="{% cycle 'row1' 'row2' %}">
+				<td>{{ query.0|floatformat:"4" }}</td>
+				<td>{{ query.1|escape }}</td>
+				<td>{{ query.2|escape }}</td>
+				<td><acronym title="{{ query.3.0 }}:{{ query.3.1 }}">{{ query.3.2|escape }}</acronym>: {{ query.3.3.0|escape }}</td>
+			</tr>
+		{% endfor %}
+	</tbody>
+</table>
\ No newline at end of file
-- 
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