98 lines
3.3 KiB
Python
98 lines
3.3 KiB
Python
# © 2020 io mintz <io@mintz.cc>
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#
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# Emote Manager is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# Emote Manager is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with Emote Manager. If not, see <https://www.gnu.org/licenses/>.
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from multiprocessing.shared_memory import ShareableList
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from discord.ext import commands
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from bot_bin.stats import BotBinStats
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# The resource tracker unlinks shared memory on shutdown and assumes all processes that share memory
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# share a parent python process. But this is not necessarily the case: the user might decide to run
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# each cluster as a systemd unit for example. We don't want a crash of a single cluster to unlink
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# the shared memory segment, so we stub out the resource tracking process here,
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# as there's no built in way to disable it.
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# See https://bugs.python.org/issue38119
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from multiprocessing import resource_tracker
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resource_tracker.ensure_running = lambda: None
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resource_tracker.main = lambda: None
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class Stats(BotBinStats):
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def __init__(self, bot):
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super().__init__(bot)
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# Use our user ID as part of the shm name
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# to allow running multiple instances of the bot on the same machine.
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shm_name = f'emote-manager-{self.bot.user_id}'
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if self.is_opener():
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seq = [0] * self.bot.shard_count
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try:
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self.shlist = ShareableList(seq, name=shm_name)
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except FileExistsError:
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# The file was probably left open from a previous run of the bot,
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# so let's re-attach and wipe the old data.
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self.shlist = ShareableList(name=shm_name)
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# apparently ShareableLists don't support slicing with None values of `stop`
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self.shlist[:self.bot.shard_count] = seq
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else:
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try:
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self.shlist = ShareableList(name=shm_name)
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except FileNotFoundError:
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# looks like we're the first cluster to start up
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seq = [0] * self.bot.shard_count
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self.shlist = ShareableList(seq, name=shm_name)
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self.count()
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def is_opener(self):
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"""return whether this is the cluster that should open the shared memory"""
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return 0 in self.bot.shard_ids
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def is_reporter(self):
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"""return whether this is the cluster that should report stats to the bot lists"""
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return self.bot.shard_count - 1 in self.bot.shard_ids
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def cog_unload(self):
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self.shlist.shm.close()
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if self.is_opener():
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self.shlist.shm.unlink()
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@commands.Cog.listener()
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async def on_ready(self):
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self.count()
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all_shards_ready = all(self.shlist)
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if self.is_reporter() and all_shards_ready:
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await self.send()
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def count(self):
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for shard_id in self.bot.shard_ids:
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self.shlist[shard_id] = 0
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for guild in self.bot.guilds:
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self.shlist[guild.shard_id] += 1
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@commands.Cog.listener()
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async def on_guild_join(self, guild):
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self.shlist[guild.shard_id] += 1
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@commands.Cog.listener()
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async def on_guild_remove(self, guild):
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self.shlist[guild.shard_id] -= 1
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async def guild_count(self):
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return sum(self.shlist)
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def setup(bot):
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bot.add_cog(Stats(bot))
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