Give more information about mirror check runs and frequency

Show how many times the check has ran in the last 24 hours, as well as the
average interval between checks.

Signed-off-by: Dan McGee <dan@archlinux.org>

mirrors/utils.py

@@ -5,10 +5,11 @@
 
 import datetime
 
+default_cutoff = datetime.timedelta(hours=24)
 
 @cache_function(300)
-def get_mirror_statuses():
-    cutoff_time = datetime.datetime.utcnow() - datetime.timedelta(hours=24)
+def get_mirror_statuses(cutoff=default_cutoff):
+    cutoff_time = datetime.datetime.utcnow() - cutoff
     protocols = MirrorProtocol.objects.exclude(protocol__iexact='rsync')
     # I swear, this actually has decent performance...
     urls = MirrorUrl.objects.select_related('mirror', 'protocol').filter(
@@ -41,11 +42,29 @@ def get_mirror_statuses():
         else:
             url.delay = None
             url.score = None
-    return urls
+
+    if urls:
+        last_check = max([u.last_check for u in urls])
+        num_checks = max([u.check_count for u in urls])
+        check_info = MirrorLog.objects.filter(
+                check_time__gte=cutoff_time).aggregate(
+                mn=Min('check_time'), mx=Max('check_time'))
+        check_frequency = (check_info['mx'] - check_info['mn']) / num_checks
+    else:
+        last_check = None
+        num_checks = 0
+        check_frequency = None
+
+    return {
+        'last_check': last_check,
+        'num_checks': num_checks,
+        'check_frequency': check_frequency,
+        'urls': urls,
+    }
 
 @cache_function(300)
-def get_mirror_errors():
-    cutoff_time = datetime.datetime.utcnow() - datetime.timedelta(hours=24)
+def get_mirror_errors(cutoff=default_cutoff):
+    cutoff_time = datetime.datetime.utcnow() - cutoff
     errors = MirrorLog.objects.filter(
             is_success=False, check_time__gte=cutoff_time,
             url__mirror__active=True, url__mirror__public=True).values(

mirrors/views.py

@@ -55,7 +55,8 @@ def find_mirrors(request, countries=None, protocols=None, use_status=False):
         urls = qset.order_by('mirror__country', 'mirror__name', 'url')
         template = 'mirrors/mirrorlist.txt'
     else:
-        scores = dict([(u.id, u.score) for u in get_mirror_statuses()])
+        status_info = get_mirror_statuses()
+        scores = dict([(u.id, u.score) for u in status_info['urls']])
         urls = []
         for u in qset:
             u.score = scores[u.id]
@@ -72,13 +73,9 @@ def find_mirrors(request, countries=None, protocols=None, use_status=False):
 
 def status(request):
     bad_timedelta = datetime.timedelta(days=3)
-    urls = get_mirror_statuses()
-
-    if urls:
-        last_check = max([u.last_check for u in urls])
-    else:
-        last_check = None
+    status_info = get_mirror_statuses()
 
+    urls = status_info['urls']
     good_urls = []
     bad_urls = []
     for url in urls:
@@ -88,12 +85,12 @@ def status(request):
         else:
             good_urls.append(url)
 
-    context = {
-        'last_check': last_check,
+    context = status_info.copy()
+    context.update({
         'good_urls': good_urls,
         'bad_urls': bad_urls,
         'error_logs': get_mirror_errors(),
-    }
+    })
     return direct_to_template(request, 'mirrors/status.html', context)
 
 # vim: set ts=4 sw=4 et:

templates/mirrors/status.html

@@ -1,4 +1,5 @@
 {% extends "base.html" %}
+{% load mirror_status %}
 
 {% block title %}Arch Linux - Mirror Status{% endblock %}
 
@@ -21,7 +22,7 @@ <h2>Mirror Status</h2>
         retrieved or contained data we didn't recognize, this column will show
         'unknown'.</li>
         <li><em>μ Delay:</em> The calculated average mirroring delay; e.g. the
-        mean value of <code>last check − last sync</code> for each check of
+        mean value of <tt>last check − last sync</tt> for each check of
         this mirror URL.</li>
         <li><em>μ Duration:</em> The average (mean) time it took to connect and
         retrieve the <tt>lastsync</tt> file from the given URL. Note that this
@@ -31,8 +32,8 @@ <h2>Mirror Status</h2>
         retrieval time. A high standard deviation can indicate an unstable or
         overloaded mirror.</li>
         <li><em>Mirror Score:</em> A very rough calculation for ranking
-        mirrors. It is currently calculated as <code>hours delay + average
-            duration + standard deviation</code>. Lower is better.</li>
+        mirrors. It is currently calculated as <tt>hours delay + average
+            duration + standard deviation</tt>. Lower is better.</li>
     </ul>
     <p>The final table on this page is an error log, which shows any errors
     that occurred while contacting mirrors. This only shows errors that
@@ -43,7 +44,9 @@ <h2>Mirror Status</h2>
         <li><a href="#errorlog">Mirror Syncing Error Log</a></li>
     </ul>
 
-    <p>The last mirror check ran at {{ last_check|date:'Y-m-d H:i' }} UTC.</p>
+    <p>The last mirror check ran at {{ last_check|date:'Y-m-d H:i' }} UTC.
+    Checks have ran {{ num_checks }} times in the last 24 hours at an average
+    interval of {{ check_frequency|duration }} (hh:mm).</p>
 
     <a name="outofsync" id="outofsync"></a>
     <h3>Out of Sync Mirrors</h3>