add opt-in inactive channel pruning

Author: jesopo

modules/inactive_channels.py

@@ -0,0 +1,50 @@
+import datetime
+from src import ModuleManager, utils
+
+PRUNE_TIMEDELTA = datetime.timedelta(weeks=2)
+SETTING = utils.BoolSetting("inactive-channels",
+    "Whether or not to leave inactive channels after 2 weeks")
+
+@utils.export("botset", SETTING)
+@utils.export("serverset", SETTING)
+class Module(ModuleManager.BaseModule):
+    def _get_timestamp(self, channel):
+        return channel.get_setting("last-message", None)
+    def _set_timestamp(self, channel):
+        channel.set_setting("last-message",
+            utils.datetime.format.iso8601(utils.datetime.utcnow()))
+    def _del_timestamp(self, channel):
+        channel.del_setting("last-message")
+
+    @utils.hook("new.channel")
+    def new_channel(self, event):
+        if self._get_timestamp(event["channel"]) == None:
+            self._set_timestamp(event["channel"])
+
+    @utils.hook("cron")
+    @utils.kwarg("schedule", "0")
+    def hourly(self, event):
+        parts = []
+        now = utils.datetime.utcnow()
+        botwide_setting = self.bot.get_setting("inactive-channels", False)
+
+        for server in self.bot.servers.values():
+            if not server.get_setting("inactive-channels", botwide_setting):
+                continue
+
+            for channel in server.channels:
+                timestamp = self._get_timestamp(channel)
+                if timestamp:
+                    dt = utils.datetime.parse.iso8601(timestamp)
+                    if (now-dt) >= PRUNE_TIMEDELTA:
+                        parts.append([server, channel])
+
+        for server, channel in parts:
+            self.log.warn("Leaving %s:%s due to channel inactivity",
+                [str(server), str(channel)])
+            channel.send_part("Channel inactive")
+            self._del_timestamp(channel)
+
+    @utils.hook("received.message.channel")
+    def channel_message(self, event):
+        self._set_timestamp(event["channel"])