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Track presence state per-device and combine to a user state. #16066

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Sep 5, 2023

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@clokep clokep commented Aug 4, 2023

Tracks presence on an individual per-device basis and combines the per-device state into a per-user state. This should help in situations where a user has two devices with conflicting status (e.g. one is syncing with unavailable and one is syncing with online).

The tie-breaking is done by priority:

BUSY > ONLINE > UNAVAILABLE > OFFLINE

Builds on #16170, #16171, #16172.

@clokep clokep force-pushed the clokep/presence branch 3 times, most recently from cc66e18 to 1f2a2a0 Compare August 4, 2023 16:04
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clokep commented Aug 4, 2023

@erikjohnston Can you take a look at this and see if I'm wildly missing something / breaking the world?

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Seems to mostly make sense, though it is a huge PR. Left some comments, but I think we might need to sit down with it? I'm assuming there is now chance of splitting this PR up?

if prev_state.state == PresenceState.UNAVAILABLE:
new_fields["state"] = PresenceState.ONLINE
# Update the device information & mark the device as online if it was
# unavailable.
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I feel like this is a "what" comment rather than a "why" comment? Why can't we go from offline -> online? Presumably because we need to have a sync stream to transition out of offline, which we clearly don't have?

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That's fair, I think the code is just a bit complicated and was attempting to put a succinct description of what's going on.

# Mark the device as online since it is not syncing, this
# might mark the user as online, so send an update.
device_state.state = PresenceState.ONLINE
presence = _combine_device_states(devices.values())
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I feel like a lot of this logic is a bit scattered around? I'd expect the state machine conditions to be in one place where we update the device info?

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Yes, I did not love how this is scattered around. Will give it a think! 👍

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I think this is pretty simplified now, but we still do call _combine_presence_state in a few spots.

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@clokep clokep changed the base branch from develop to clokep/presence-prep-2 August 23, 2023 15:45
@clokep clokep force-pushed the clokep/presence-prep-2 branch 2 times, most recently from caf6119 to 7a8ef9f Compare August 28, 2023 17:10
@clokep clokep changed the title Track presence state per-device and amalgamate to a user state. Track presence state per-device and combine to a user state. Aug 28, 2023
Comment on lines +2212 to +2217
if (PRESENCE_BY_PRIORITY[device_state.state], device_state.last_active_ts) > (
PRESENCE_BY_PRIORITY[presence],
last_active_ts,
):
presence = device_state.state
last_active_ts = device_state.last_active_ts
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This could probably all be replaced with max(device_states) if we define the correct comparison method.

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Or even just max with an explicit key function.

Base automatically changed from clokep/presence-prep-2 to develop August 29, 2023 15:44
@clokep clokep marked this pull request as ready for review August 29, 2023 16:39
@clokep clokep requested a review from a team as a code owner August 29, 2023 16:39
@clokep clokep merged commit ea75346 into develop Sep 5, 2023
37 checks passed
@clokep clokep deleted the clokep/presence branch September 5, 2023 13:58
clokep added a commit that referenced this pull request Sep 5, 2023
Tracks presence on an individual per-device basis and combine
the per-device state into a per-user state. This should help in
situations where a user has multiple devices with conflicting status
(e.g. one is syncing with unavailable and one is syncing with online).

The tie-breaking is done by priority:

    BUSY > ONLINE > UNAVAILABLE > OFFLINE
yingziwu added a commit to yingziwu/synapse that referenced this pull request Oct 3, 2023
No significant changes since 1.93.0rc1.

The following issues are fixed in 1.93.0 (and RCs).

- [GHSA-4f74-84v3-j9q5](GHSA-4f74-84v3-j9q5) / [CVE-2023-41335](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-41335) — Low Severity

  Temporary storage of plaintext passwords during password changes.

- [GHSA-7565-cq32-vx2x](GHSA-7565-cq32-vx2x) / [CVE-2023-42453](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-42453) — Low Severity

  Improper validation of receipts allows forged read receipts.

See the advisories for more details. If you have any questions, email [email protected].

- Add automatic purge after all users have forgotten a room. ([\matrix-org#15488](matrix-org#15488))
- Restore room purge/shutdown after a Synapse restart. ([\matrix-org#15488](matrix-org#15488))
- Support resolving homeservers using `matrix-fed` DNS SRV records from [MSC4040](matrix-org/matrix-spec-proposals#4040). ([\matrix-org#16137](matrix-org#16137))
- Add the ability to use `G` (GiB) and `T` (TiB) suffixes in configuration options that refer to numbers of bytes. ([\matrix-org#16219](matrix-org#16219))
- Add span information to requests sent to appservices. Contributed by MTRNord. ([\matrix-org#16227](matrix-org#16227))
- Add the ability to enable/disable registrations when using CAS. Contributed by Aurélien Grimpard. ([\matrix-org#16262](matrix-org#16262))
- Allow the `/notifications` endpoint to be routed to workers. ([\matrix-org#16265](matrix-org#16265))
- Enable users to easily unsubscribe to notifications emails via the `List-Unsubscribe` header. ([\matrix-org#16274](matrix-org#16274))
- Report whether a user is `locked` in the [List Accounts admin API](https://matrix-org.github.io/synapse/latest/admin_api/user_admin_api.html#list-accounts), and exclude locked users by default. ([\matrix-org#16328](matrix-org#16328))

- Fix a long-standing bug where multi-device accounts could cause high load due to presence. ([\matrix-org#16066](matrix-org#16066), [\matrix-org#16170](matrix-org#16170), [\matrix-org#16171](matrix-org#16171), [\matrix-org#16172](matrix-org#16172), [\matrix-org#16174](matrix-org#16174))
- Fix a long-standing bug where appservices using [MSC2409](matrix-org/matrix-spec-proposals#2409) to receive `to_device` messages would only get messages for one user. ([\matrix-org#16251](matrix-org#16251))
- Fix bug when using workers where Synapse could end up re-requesting the same remote device repeatedly. ([\matrix-org#16252](matrix-org#16252))
- Fix long-standing bug where we kept re-requesting a remote server's key repeatedly, potentially causing delays in receiving events over federation. ([\matrix-org#16257](matrix-org#16257))
- Avoid temporary storage of sensitive information. ([\matrix-org#16272](matrix-org#16272))
- Fix bug introduced in Synapse 1.49.0 when using dehydrated devices ([MSC2697](matrix-org/matrix-spec-proposals#2697)) and refresh tokens. Contributed by Hanadi. ([\matrix-org#16288](matrix-org#16288))
- Fix a long-standing bug where invalid receipts would be accepted. ([\matrix-org#16327](matrix-org#16327))
- Use standard name for UTF-8 charset in emails. ([\matrix-org#16329](matrix-org#16329))
- Don't try refetching device lists for users on remote hosts that are marked as "down". ([\matrix-org#16298](matrix-org#16298))

- Fix typos in the documentation. ([\matrix-org#16282](matrix-org#16282))
- Link to the Alpine Linux community package for Synapse. ([\matrix-org#16304](matrix-org#16304))
- Use string for `federation_client_minimum_tls_version` documentation examples. Contributed by @jcgruenhage. ([\matrix-org#16353](matrix-org#16353))

- Allow modules to delete rooms. ([\matrix-org#15997](matrix-org#15997))
- Add GCC and GNU Make to the Nix flake development environment so that `ruff` can be compiled. ([\matrix-org#16090](matrix-org#16090), [\matrix-org#16263](matrix-org#16263))
- Fix type checking when using the new version of Twisted. ([\matrix-org#16235](matrix-org#16235))
- Delete device messages asynchronously and in staged batches using the task scheduler. ([\matrix-org#16240](matrix-org#16240), [\matrix-org#16311](matrix-org#16311), [\matrix-org#16312](matrix-org#16312), [\matrix-org#16313](matrix-org#16313))
- Bump minimum supported Rust version to 1.61.0. ([\matrix-org#16248](matrix-org#16248))
- Update rust to version 1.71.1 in the nix development environment. ([\matrix-org#16260](matrix-org#16260))
- Simplify server key storage. ([\matrix-org#16261](matrix-org#16261))
- Reduce CPU overhead of change password endpoint. ([\matrix-org#16264](matrix-org#16264))
- Stop purging from tables slated for removal. ([\matrix-org#16273](matrix-org#16273))
- Improve type hints. ([\matrix-org#16276](matrix-org#16276), [\matrix-org#16301](matrix-org#16301), [\matrix-org#16325](matrix-org#16325), [\matrix-org#16326](matrix-org#16326))
- Raise `setuptools_rust` version cap to 1.7.0. ([\matrix-org#16277](matrix-org#16277))
- Fix using the new task scheduler causing lots of CPU to be used. ([\matrix-org#16278](matrix-org#16278))
- Upgrade CI run of Python 3.12 from rc1 to rc2. ([\matrix-org#16280](matrix-org#16280))
- Include values in SQL debug when using `execute_values` with Postgres. ([\matrix-org#16281](matrix-org#16281))
- Enable additional linting checks. ([\matrix-org#16283](matrix-org#16283))
- Refactor `receipts_graph` Postgres transactions to stop error messages. ([\matrix-org#16299](matrix-org#16299))
- Small improvements to logging in replication code. ([\matrix-org#16309](matrix-org#16309))
- Remove a reference cycle in background processes. ([\matrix-org#16314](matrix-org#16314))
- Only use literal strings for background process names. ([\matrix-org#16315](matrix-org#16315))
- Refactor `get_user_by_id`. ([\matrix-org#16316](matrix-org#16316))
- Speed up task to delete to-device messages. ([\matrix-org#16318](matrix-org#16318))
- Avoid patching code in tests. ([\matrix-org#16349](matrix-org#16349))
- Test against PostgreSQL 16. ([\matrix-org#16351](matrix-org#16351))

* Bump mypy from 1.4.1 to 1.5.1. ([\matrix-org#16300](matrix-org#16300))
* Bump black from 23.7.0 to 23.9.1. ([\matrix-org#16295](matrix-org#16295))
* Bump docker/build-push-action from 4 to 5. ([\matrix-org#16336](matrix-org#16336))
* Bump docker/login-action from 2 to 3. ([\matrix-org#16339](matrix-org#16339))
* Bump docker/metadata-action from 4 to 5. ([\matrix-org#16337](matrix-org#16337))
* Bump docker/setup-qemu-action from 2 to 3. ([\matrix-org#16338](matrix-org#16338))
* Bump furo from 2023.8.19 to 2023.9.10. ([\matrix-org#16340](matrix-org#16340))
* Bump gitpython from 3.1.32 to 3.1.35. ([\matrix-org#16267](matrix-org#16267), [\matrix-org#16279](matrix-org#16279))
* Bump mypy-zope from 1.0.0 to 1.0.1. ([\matrix-org#16291](matrix-org#16291))
* Bump pillow from 10.0.0 to 10.0.1. ([\matrix-org#16344](matrix-org#16344))
* Bump regex from 1.9.4 to 1.9.5. ([\matrix-org#16233](matrix-org#16233))
* Bump ruff from 0.0.286 to 0.0.290. ([\matrix-org#16342](matrix-org#16342))
* Bump serde_json from 1.0.105 to 1.0.107. ([\matrix-org#16296](matrix-org#16296), [\matrix-org#16345](matrix-org#16345))
* Bump twisted from 22.10.0 to 23.8.0. ([\matrix-org#16235](matrix-org#16235))
* Bump types-pillow from 10.0.0.2 to 10.0.0.3. ([\matrix-org#16293](matrix-org#16293))
* Bump types-setuptools from 68.0.0.3 to 68.2.0.0. ([\matrix-org#16292](matrix-org#16292))
* Bump typing-extensions from 4.7.1 to 4.8.0. ([\matrix-org#16341](matrix-org#16341))
Fizzadar added a commit to beeper/synapse-legacy-fork that referenced this pull request Oct 27, 2023
No significant changes since 1.93.0rc1.

The following issues are fixed in 1.93.0 (and RCs).

- [GHSA-4f74-84v3-j9q5](GHSA-4f74-84v3-j9q5) / [CVE-2023-41335](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-41335) — Low Severity

  Temporary storage of plaintext passwords during password changes.

- [GHSA-7565-cq32-vx2x](GHSA-7565-cq32-vx2x) / [CVE-2023-42453](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-42453) — Low Severity

  Improper validation of receipts allows forged read receipts.

See the advisories for more details. If you have any questions, email [email protected].

- Add automatic purge after all users have forgotten a room. ([\matrix-org#15488](matrix-org#15488))
- Restore room purge/shutdown after a Synapse restart. ([\matrix-org#15488](matrix-org#15488))
- Support resolving homeservers using `matrix-fed` DNS SRV records from [MSC4040](matrix-org/matrix-spec-proposals#4040). ([\matrix-org#16137](matrix-org#16137))
- Add the ability to use `G` (GiB) and `T` (TiB) suffixes in configuration options that refer to numbers of bytes. ([\matrix-org#16219](matrix-org#16219))
- Add span information to requests sent to appservices. Contributed by MTRNord. ([\matrix-org#16227](matrix-org#16227))
- Add the ability to enable/disable registrations when using CAS. Contributed by Aurélien Grimpard. ([\matrix-org#16262](matrix-org#16262))
- Allow the `/notifications` endpoint to be routed to workers. ([\matrix-org#16265](matrix-org#16265))
- Enable users to easily unsubscribe to notifications emails via the `List-Unsubscribe` header. ([\matrix-org#16274](matrix-org#16274))
- Report whether a user is `locked` in the [List Accounts admin API](https://matrix-org.github.io/synapse/latest/admin_api/user_admin_api.html#list-accounts), and exclude locked users by default. ([\matrix-org#16328](matrix-org#16328))

- Fix a long-standing bug where multi-device accounts could cause high load due to presence. ([\matrix-org#16066](matrix-org#16066), [\matrix-org#16170](matrix-org#16170), [\matrix-org#16171](matrix-org#16171), [\matrix-org#16172](matrix-org#16172), [\matrix-org#16174](matrix-org#16174))
- Fix a long-standing bug where appservices using [MSC2409](matrix-org/matrix-spec-proposals#2409) to receive `to_device` messages would only get messages for one user. ([\matrix-org#16251](matrix-org#16251))
- Fix bug when using workers where Synapse could end up re-requesting the same remote device repeatedly. ([\matrix-org#16252](matrix-org#16252))
- Fix long-standing bug where we kept re-requesting a remote server's key repeatedly, potentially causing delays in receiving events over federation. ([\matrix-org#16257](matrix-org#16257))
- Avoid temporary storage of sensitive information. ([\matrix-org#16272](matrix-org#16272))
- Fix bug introduced in Synapse 1.49.0 when using dehydrated devices ([MSC2697](matrix-org/matrix-spec-proposals#2697)) and refresh tokens. Contributed by Hanadi. ([\matrix-org#16288](matrix-org#16288))
- Fix a long-standing bug where invalid receipts would be accepted. ([\matrix-org#16327](matrix-org#16327))
- Use standard name for UTF-8 charset in emails. ([\matrix-org#16329](matrix-org#16329))
- Don't try refetching device lists for users on remote hosts that are marked as "down". ([\matrix-org#16298](matrix-org#16298))

- Fix typos in the documentation. ([\matrix-org#16282](matrix-org#16282))
- Link to the Alpine Linux community package for Synapse. ([\matrix-org#16304](matrix-org#16304))
- Use string for `federation_client_minimum_tls_version` documentation examples. Contributed by @jcgruenhage. ([\matrix-org#16353](matrix-org#16353))

- Allow modules to delete rooms. ([\matrix-org#15997](matrix-org#15997))
- Add GCC and GNU Make to the Nix flake development environment so that `ruff` can be compiled. ([\matrix-org#16090](matrix-org#16090), [\matrix-org#16263](matrix-org#16263))
- Fix type checking when using the new version of Twisted. ([\matrix-org#16235](matrix-org#16235))
- Delete device messages asynchronously and in staged batches using the task scheduler. ([\matrix-org#16240](matrix-org#16240), [\matrix-org#16311](matrix-org#16311), [\matrix-org#16312](matrix-org#16312), [\matrix-org#16313](matrix-org#16313))
- Bump minimum supported Rust version to 1.61.0. ([\matrix-org#16248](matrix-org#16248))
- Update rust to version 1.71.1 in the nix development environment. ([\matrix-org#16260](matrix-org#16260))
- Simplify server key storage. ([\matrix-org#16261](matrix-org#16261))
- Reduce CPU overhead of change password endpoint. ([\matrix-org#16264](matrix-org#16264))
- Stop purging from tables slated for removal. ([\matrix-org#16273](matrix-org#16273))
- Improve type hints. ([\matrix-org#16276](matrix-org#16276), [\matrix-org#16301](matrix-org#16301), [\matrix-org#16325](matrix-org#16325), [\matrix-org#16326](matrix-org#16326))
- Raise `setuptools_rust` version cap to 1.7.0. ([\matrix-org#16277](matrix-org#16277))
- Fix using the new task scheduler causing lots of CPU to be used. ([\matrix-org#16278](matrix-org#16278))
- Upgrade CI run of Python 3.12 from rc1 to rc2. ([\matrix-org#16280](matrix-org#16280))
- Include values in SQL debug when using `execute_values` with Postgres. ([\matrix-org#16281](matrix-org#16281))
- Enable additional linting checks. ([\matrix-org#16283](matrix-org#16283))
- Refactor `receipts_graph` Postgres transactions to stop error messages. ([\matrix-org#16299](matrix-org#16299))
- Small improvements to logging in replication code. ([\matrix-org#16309](matrix-org#16309))
- Remove a reference cycle in background processes. ([\matrix-org#16314](matrix-org#16314))
- Only use literal strings for background process names. ([\matrix-org#16315](matrix-org#16315))
- Refactor `get_user_by_id`. ([\matrix-org#16316](matrix-org#16316))
- Speed up task to delete to-device messages. ([\matrix-org#16318](matrix-org#16318))
- Avoid patching code in tests. ([\matrix-org#16349](matrix-org#16349))
- Test against PostgreSQL 16. ([\matrix-org#16351](matrix-org#16351))

* Bump mypy from 1.4.1 to 1.5.1. ([\matrix-org#16300](matrix-org#16300))
* Bump black from 23.7.0 to 23.9.1. ([\matrix-org#16295](matrix-org#16295))
* Bump docker/build-push-action from 4 to 5. ([\matrix-org#16336](matrix-org#16336))
* Bump docker/login-action from 2 to 3. ([\matrix-org#16339](matrix-org#16339))
* Bump docker/metadata-action from 4 to 5. ([\matrix-org#16337](matrix-org#16337))
* Bump docker/setup-qemu-action from 2 to 3. ([\matrix-org#16338](matrix-org#16338))
* Bump furo from 2023.8.19 to 2023.9.10. ([\matrix-org#16340](matrix-org#16340))
* Bump gitpython from 3.1.32 to 3.1.35. ([\matrix-org#16267](matrix-org#16267), [\matrix-org#16279](matrix-org#16279))
* Bump mypy-zope from 1.0.0 to 1.0.1. ([\matrix-org#16291](matrix-org#16291))
* Bump pillow from 10.0.0 to 10.0.1. ([\matrix-org#16344](matrix-org#16344))
* Bump regex from 1.9.4 to 1.9.5. ([\matrix-org#16233](matrix-org#16233))
* Bump ruff from 0.0.286 to 0.0.290. ([\matrix-org#16342](matrix-org#16342))
* Bump serde_json from 1.0.105 to 1.0.107. ([\matrix-org#16296](matrix-org#16296), [\matrix-org#16345](matrix-org#16345))
* Bump twisted from 22.10.0 to 23.8.0. ([\matrix-org#16235](matrix-org#16235))
* Bump types-pillow from 10.0.0.2 to 10.0.0.3. ([\matrix-org#16293](matrix-org#16293))
* Bump types-setuptools from 68.0.0.3 to 68.2.0.0. ([\matrix-org#16292](matrix-org#16292))
* Bump typing-extensions from 4.7.1 to 4.8.0. ([\matrix-org#16341](matrix-org#16341))

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Successfully merging this pull request may close these issues.

Handling of differing set_presence values between devices causes sync tightlooping
5 participants