Add "recent readings" to email template context

rattail_tempmon/server.py

@@ -32,6 +32,7 @@ import logging
 
 import six
 import humanize
+from sqlalchemy import orm
 from sqlalchemy.exc import OperationalError
 
 from rattail.db import Session, api
@@ -182,12 +183,13 @@ class TempmonServerDaemon(Daemon):
             return False
 
     def update_status(self, probe, status, reading=None):
+        now = localtime(self.config)
         data = {
             'probe': probe,
             'status': self.enum.TEMPMON_PROBE_STATUS[status],
             'reading': reading,
             'taken': localtime(self.config, reading.taken, from_utc=True) if reading else None,
-            'now': localtime(self.config),
+            'now': now,
         }
 
         prev_status = probe.status
@@ -223,6 +225,18 @@ class TempmonServerDaemon(Daemon):
         data['status_since'] = since.strftime('%I:%M %p')
         data['status_since_delta'] = humanize.naturaltime(self.now - probe.status_changed)
 
+        # fetch last 90 minutes of readings
+        session = orm.object_session(probe)
+        recent_minutes = 90     # TODO: make configurable
+        cutoff = now - datetime.timedelta(seconds=(60 * recent_minutes))
+        readings = session.query(tempmon.Reading)\
+                          .filter(tempmon.Reading.probe == probe)\
+                          .filter(tempmon.Reading.taken >= make_utc(cutoff))\
+                          .order_by(tempmon.Reading.taken.desc())
+        data['recent_minutes'] = recent_minutes
+        data['recent_readings'] = readings
+        data['pretty_time'] = lambda dt: localtime(self.config, dt, from_utc=True).strftime('%Y-%m-%d %I:%M %p')
+
         msgtypes = {
             self.enum.TEMPMON_PROBE_STATUS_LOW_TEMP             : 'tempmon_low_temp',
             self.enum.TEMPMON_PROBE_STATUS_HIGH_TEMP            : 'tempmon_high_temp',