Search for missed support messages from today and yesterday

Slack only allows us to search from a date, not a datetime (times
can be used too, but they apply to times on every day).

Sometimes, it seems slack's search just doesn't return messages
for a while. We now make it check for the whole of yesterday
AND today.

We also don't need to give it a "before" search term.

bennettbot/dispatcher.py

@@ -236,14 +236,16 @@ def do_check(self, run_fn=lambda: True, delay=10):  # pragma: no branch
         # https://api.slack.com/apis/rate-limits#tier_t2
         # A 10s delay should be safe for our 2 calls per loop
         while run_fn():
+            # check for messages from today and yesterday; sometimes it seems to
+            # take a while for slack to return messages in search results, so
+            # make sure that messages sent late in the day still get picked up
             today = datetime.today()
-            yesterday = (today - timedelta(days=1)).strftime("%Y-%m-%d")
-            tomorrow = (today + timedelta(days=1)).strftime("%Y-%m-%d")
+            check_from = (today - timedelta(days=2)).strftime("%Y-%m-%d")
             for keyword in self.config:
-                self.check_messages(keyword, tomorrow, yesterday)
+                self.check_messages(keyword, check_from)
             time.sleep(delay)
 
-    def check_messages(self, keyword, before, after):
+    def check_messages(self, keyword, after):
         logger.debug("Checking %s messages", keyword)
         reaction = self.config[keyword]["reaction"]
         channel = self.config[keyword]["channel"]
@@ -259,8 +261,8 @@ def check_messages(self, keyword, before, after):
                 f"-from:@{settings.SLACK_APP_USERNAME} "
                 # exclude DMs as the auto-responders don't respond to these anyway
                 f"-is:dm "
-                # only include messages from today
-                f"before:{before} after:{after}"
+                # only include messages from today and yesterday
+                f"after:{after}"
             )
         )["messages"]["matches"]
         for message in messages:

tests/test_dispatcher.py

@@ -539,7 +539,8 @@ def test_message_checker_config():
     }
 
 
-def test_message_checker_run():
+def test_message_checker_run(freezer):
+    freezer.move_to("2024-10-08 23:30")
     httpretty_register(
         {
             "search.messages": [
@@ -557,6 +558,9 @@ def test_message_checker_run():
     # search.messages is called twice for each run of the checker
     # no matches, so no reactions or messages reposted.
     assert len(httpretty.latest_requests()) == 4
+    requests_by_path = get_mock_received_requests()
+    last_search_query = requests_by_path["/api/search.messages"][-1]["query"][0]
+    assert "after:2024-10-06" in last_search_query
 
 
 @pytest.mark.parametrize(
@@ -604,7 +608,7 @@ def test_message_checker_matched_messages(keyword, support_channel, reaction):
 
     checker = MessageChecker(slack_web_client("bot"), slack_web_client("user"))
 
-    checker.check_messages(keyword, "2024-03-04", "2024-03-02")
+    checker.check_messages(keyword, "2024-03-02")
     # search.messages is called once
     # other 3 endpoints called once each for 2 matched messages requiring
     # reaction and reposting.
@@ -616,7 +620,7 @@ def test_message_checker_matched_messages(keyword, support_channel, reaction):
             "query": [
                 f'"{keyword}" -has::{reaction}: -in:#{support_channel} '
                 f"-from:@{settings.SLACK_APP_USERNAME} -is:dm "
-                "before:2024-03-04 after:2024-03-02"
+                "after:2024-03-02"
             ]
         }
     ]