Add Sentry exception handling

README.md

@@ -74,3 +74,12 @@ To minimize the risk of making a mistake, Destalinator will run in a dry-run mod
 #### `DESTALINATOR_LOG_LEVEL`
 
 Tune your preferred log level for server logs or local debugging. Does not affect the ENV var specified by `output_debug_env_varname`.
+
+#### `SENTRY_DSN`
+
+In order to configure exception handling & tracking with [Sentry](https://sentry.io/), set up a Sentry account and
+configure this environment variable with the appropriate DSN value.
+
+If you're on Heroku, you can provision this with:
+
+    heroku addons:create sentry:f1

requirements.txt

@@ -1,3 +1,4 @@
 APScheduler==3.0.5
 requests==2.9.1
 PyYAML==3.11
+raven==6.1.0

scheduler.py

@@ -1,10 +1,16 @@
-from apscheduler.schedulers.blocking import BlockingScheduler
 import logging
+import os
+
+from apscheduler.schedulers.blocking import BlockingScheduler
+from raven.base import Client as RavenClient
+
 import warner
 import archiver
 import announcer
 import flagger
-import os
+
+
+raven_client = RavenClient()
 
 
 # When testing changes, set the "TEST_SCHEDULE" envvar to run more often
@@ -16,25 +22,30 @@
 logging.basicConfig()
 sched = BlockingScheduler()
 
+
 @sched.scheduled_job("cron", **schedule_kwargs)
 def destalinate_job():
     print("Destalinating")
     if "SB_TOKEN" not in os.environ or "API_TOKEN" not in os.environ:
         print("ERR: Missing at least one Slack environment variable.")
     else:
-        scheduled_warner = warner.Warner()
-        scheduled_archiver = archiver.Archiver()
-        scheduled_announcer = announcer.Announcer()
-        scheduled_flagger = flagger.Flagger()
-        print("Warning")
-        scheduled_warner.warn()
-        print("Archiving")
-        scheduled_archiver.archive()
-        print("Announcing")
-        scheduled_announcer.announce()
-        print("Flagging")
-        scheduled_flagger.flag()
-        print("OK: destalinated")
+        try:
+            scheduled_warner = warner.Warner()
+            scheduled_archiver = archiver.Archiver()
+            scheduled_announcer = announcer.Announcer()
+            scheduled_flagger = flagger.Flagger()
+            print("Warning")
+            scheduled_warner.warn()
+            print("Archiving")
+            scheduled_archiver.archive()
+            print("Announcing")
+            scheduled_announcer.announce()
+            print("Flagging")
+            scheduled_flagger.flag()
+            print("OK: destalinated")
+        except Exception:  # pylint: disable=W0703
+            raven_client.captureException()
     print("END: destalinate_job")
 
+
 sched.start()