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fix: Avoid v12 room ID collisions when creating rooms concurrently #2433

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Jade merged 3 commits from eleboucher/continuwuity:fix/v12-room-id-collision into main 2026-11-03 09:52:44 +00:00
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eleboucher commented 2026-10-31 08:55:57 +00:00
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Fixes #2424. v12 rooms created by the same user in the same millisecond got the same room ID, so they ended up as one room. Room creation now locks on the room ID and bumps origin_server_ts by 1ms until the ID is free (up to 5 tries, like Synapse), and returns M_ROOM_IN_USE if the client set the timestamp itself.

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<!-- In order to help reviewers know what your pull request does at a glance, you should ensure that 1. Your PR title is a short, single sentence describing what you changed 2. You have described in more detail what you have changed, why you have changed it, what the intended effect is, and why you think this will be beneficial to the project. If you have made any potentially strange/questionable design choices, but didn't feel they'd benefit from code comments, please don't mention them here - after opening your pull request, go to "files changed", and click on the "+" symbol in the line number gutter, and attach comments to the lines that you think would benefit from some clarification. --> Fixes #2424. v12 rooms created by the same user in the same millisecond got the same room ID, so they ended up as one room. Room creation now locks on the room ID and bumps origin_server_ts by 1ms until the ID is free (up to 5 tries, like Synapse), and returns M_ROOM_IN_USE if the client set the timestamp itself. <!-- Example: This pull request allows us to warp through time and space ten times faster than before by double-inverting the warp drive with hyperheated jump fluid, both making the drive faster and more efficient. This resolves the common issue where we have to wait more than 10 milliseconds to engage, use, and disengage the warp drive when travelling between galaxies. --> <!-- Closes: #... --> <!-- Fixes: #... --> <!-- Uncomment the above line(s) if your pull request fixes an issue or closes another pull request by superseding it. Replace `#...` with the issue/pr number, such as `#123`. --> **Pull request checklist:** <!-- You need to complete these before your PR can be considered. If you aren't sure about some, feel free to ask for clarification in #dev:continuwuity.org. --> - [x] This pull request targets the `main` branch, and the branch is named something other than `main`. - [x] I have written an appropriate pull request title and my description is clear. - [x] I understand I am responsible for the contents of this pull request. - I have followed the [contributing guidelines][c1]: - [x] My contribution follows the [code style][c2], if applicable. - [x] I ran [pre-commit checks][c1pc] before opening/drafting this pull request. - [x] I have [tested my contribution][c1t] (or proof-read it for documentation-only changes) myself, if applicable. This includes ensuring code compiles. - [x] My commit messages follow the [commit message format][c1cm] and are descriptive. <!-- Notes on these requirements: - While not required, we encourage you to sign your commits with GPG or SSH to attest the authenticity of your changes. - While we allow LLM-assisted contributions, we do not appreciate contributions that are low quality, which is typical of machine-generated contributions that have not had a lot of love and care from a human. Please do not open a PR if all you have done is asked ChatGPT to tidy up the codebase with a +-100,000 diff. - In the case of code style violations, reviewers may leave review comments/change requests indicating what the ideal change would look like. For example, a reviewer may suggest you lower a log level, or use `match` instead of `if/else` etc. - In the case of code style violations, pre-commit check failures, minor things like typos/spelling errors, and in some cases commit format violations, reviewers may modify your branch directly, typically by making changes and adding a commit. Particularly in the latter case, a reviewer may rebase your commits to squash "spammy" ones (like "fix", "fix", "actually fix"), and reword commit messages that don't satisfy the format. - Pull requests MUST pass the `Checks` CI workflows to be capable of being merged. This can only be bypassed in exceptional circumstances. If your CI flakes, let us know in matrix:r/dev:continuwuity.org. - Pull requests have to be based on the latest `main` commit before being merged. If the main branch changes while you're making your changes, you should make sure you rebase on main before opening a PR. Your branch will be rebased on main before it is merged if it has fallen behind. - We typically only do fast-forward merges, so your entire commit log will be included. Once in main, it's difficult to get out cleanly, so put on your best dress, smile for the cameras! --> [c1]: https://forgejo.ellis.link/continuwuation/continuwuity/src/branch/main/CONTRIBUTING.md [c2]: https://forgejo.ellis.link/continuwuation/continuwuity/src/branch/main/docs/development/code_style.mdx [c1pc]: https://forgejo.ellis.link/continuwuation/continuwuity/src/branch/main/CONTRIBUTING.md#pre-commit-checks [c1t]: https://forgejo.ellis.link/continuwuation/continuwuity/src/branch/main/CONTRIBUTING.md#running-tests-locally [c1cm]: https://forgejo.ellis.link/continuwuation/continuwuity/src/branch/main/CONTRIBUTING.md#commit-messages
fix: Avoid v12 room ID collisions when creating rooms concurrently
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6598bb8b8a
nex commented 2026-10-31 19:24:21 +00:00
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I already said the 5-retries thing is dumb, just do a random sleep of 1-100ms on each /createRoom call

I already said the 5-retries thing is dumb, just do a random sleep of 1-100ms on each /createRoom call
refactor: Use unique create timestamps instead of retrying on room ID collisions
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60b319abaf
nex approved these changes 2026-11-01 20:21:55 +00:00
src/api/client/room/create.rs Outdated
@ -289,2 +313,4 @@
};
// v12+ room IDs are the create event's hash, so give each create event a
// unique timestamp to avoid collisions (see MSC4291)
nex commented 2026-11-01 20:21:15 +00:00
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nit: There's no need to reference the MSC when the proposal is in the spec at the time of implementing

nit: There's no need to reference the MSC when the proposal is in the spec at the time of implementing
eleboucher marked this conversation as resolved
docs: Remove obsolete MSC reference from room creation comment
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cd951d2f69
 
Signed-off-by: Erwan Leboucher <erwanleboucher@gmail.com>
Jade approved these changes 2026-11-03 09:51:37 +00:00
Jade merged commit 0727d564a2 into main 2026-11-03 09:52:44 +00:00
Jade deleted branch fix/v12-room-id-collision 2026-11-03 09:52:44 +00:00
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