Announcement channels not being updated

[mchangrh]

for some reason, announcement channels receive periodic "unknown message" errors. There is not specific documented reason why this should be the case, but there have been a few select bots that also have issues fetching from announcement channels.

a minimal code sample: https://static.mchang.xyz/niles/179-mcve.gitbundle

next step is to run it on a timer and see if it returns errors periodically

[mchangrh]

Found the source:

Discord has an undocumented ratelimit for editing messages in announcement channels. This obviously conflicts with Niles, so announcement channels will have to be banned by checking for channel.type !== news

I will clean up the code and release a proper MCVE

Edit: MCVE - https://static.mchang.xyz/niles/179-mcve.gitbundle

[mchangrh]

Update: Discord has undocumented but enforced ratelimits for both published and unpublished messages. These cannot and will not be bypassed. Announcement channels will be blocked in 4.5.4

[mchangrh]

Errors and symptoms

So what happened was Niles would give out an error of "unknown message" and in large, large quantities (200+) On the server side, there would be errors indicating the guild had an unknown message, also in extremely large quantities

Troubleshooting

• Tried running updater at an insane interval (1000ms)
  • Normal text channel ran fine for 9hrs before being stopped
  • announcement channel broke in 3 updates.
  • MCVE https://static.mchang.xyz/niles/179-mcve.gitbundle

Solution

After some messing around manually, it seemed that announcement channels were limited to (x edits in x duration) - this ratelimit changes without warning so it will not be documented

it was much too low for Niles to ratelimit down to or even maintain as an update rate so news channels were banned and now throw errors.