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Add some comments about how event push actions are stored #13445

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merged 7 commits into from
Aug 4, 2022

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So that you don't have to read all the code to grok it.

@erikjohnston erikjohnston marked this pull request as ready for review August 3, 2022 10:52
@erikjohnston erikjohnston requested a review from a team as a code owner August 3, 2022 10:52
synapse/storage/databases/main/event_push_actions.py Outdated Show resolved Hide resolved
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Comment on lines +47 to +48


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Is this double line break on purpose? Are you trying to separate it into two sections (one for counting notifications and one for clearing them?)

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Yeah, it was vaguely intentional. Not sure if it helps others or if its just a distraction?

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I think it could be clearer to put a heading:

Suggested change
Clearing notifications with read receipts
=========================================

Comment on lines 49 to 53
We need to handle when a user sends a read receipt to the room. Again this is
done as a background process. For each receipt we clear the row in
`event_push_summary` and count the number of notifications in
`event_push_actions` that happened after the receipt but before S, and insert
that count into `event_push_summary`.
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This paragraph assumes the read receipt is < S; I believe it can also happen after S in which case we completely clear the event_push_summary row and anything in event_push_actions which is <= R?

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Well, I think of after the receipt but before S as meaning the empty set if receipt is after S. Will clarify

I have somewhat intentionally not said when we trigger removal of event_push_actions, as its a bit handwavey and doesn't really affect how this all works.

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Essentially this causes us to fallback to the "just use event_push_actions table", I think?

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Yup! Though by "fallback" here, that's just the same behaviour as normal (i.e. we always read from the event_push_actions to check for events that have happened since S)

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Yup! Though by "fallback" here, that's just the same behaviour as normal (i.e. we always read from the event_push_actions to check for events that have happened since S)

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Right. Makes sense!

erikjohnston and others added 4 commits August 3, 2022 15:28
Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com>
Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com>
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clokep commented Aug 4, 2022

I added some more comments to the code itself in #13455 so that if you're trying to figure out the ins-and-outs you have something to go on.

Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com>
@clokep clokep enabled auto-merge (squash) August 4, 2022 19:30
@clokep clokep disabled auto-merge August 4, 2022 19:30
@clokep clokep enabled auto-merge (squash) August 4, 2022 19:30
@clokep clokep merged commit b6a6bb4 into develop Aug 4, 2022
@clokep clokep deleted the erikj/event_push_docs branch August 4, 2022 19:38
Fizzadar added a commit to beeper/synapse-legacy-fork that referenced this pull request Aug 25, 2022
Synapse 1.65.0 (2022-08-16)
===========================

No significant changes since 1.65.0rc2.

Synapse 1.65.0rc2 (2022-08-11)
==============================

Internal Changes
----------------

- Revert 'Remove the unspecced `room_id` field in the `/hierarchy` response. ([\matrix-org#13365](matrix-org#13365))' to give more time for clients to update. ([\matrix-org#13501](matrix-org#13501))

Synapse 1.65.0rc1 (2022-08-09)
==============================

Features
--------

- Add support for stable prefixes for [MSC2285 (private read receipts)](matrix-org/matrix-spec-proposals#2285). ([\matrix-org#13273](matrix-org#13273))
- Add new unstable error codes `ORG.MATRIX.MSC3848.ALREADY_JOINED`, `ORG.MATRIX.MSC3848.NOT_JOINED`, and `ORG.MATRIX.MSC3848.INSUFFICIENT_POWER` described in [MSC3848](matrix-org/matrix-spec-proposals#3848). ([\matrix-org#13343](matrix-org#13343))
- Use stable prefixes for [MSC3827](matrix-org/matrix-spec-proposals#3827). ([\matrix-org#13370](matrix-org#13370))
- Add a new module API method to translate a room alias into a room ID. ([\matrix-org#13428](matrix-org#13428))
- Add a new module API method to create a room. ([\matrix-org#13429](matrix-org#13429))
- Add remote join capability to the module API's `update_room_membership` method (in a backwards compatible manner). ([\matrix-org#13441](matrix-org#13441))

Bugfixes
--------

- Update the version of the LDAP3 auth provider module included in the `matrixdotorg/synapse` DockerHub images and the Debian packages hosted on packages.matrix.org to 0.2.2. This version fixes a regression in the module. ([\matrix-org#13470](matrix-org#13470))
- Fix a bug introduced in Synapse v1.41.0 where the `/hierarchy` API returned non-standard information (a `room_id` field under each entry in `children_state`). ([\matrix-org#13365](matrix-org#13365))
- Fix a bug introduced in Synapse 0.24.0 that would respond with the wrong error status code to `/joined_members` requests when the requester is not a current member of the room. Contributed by @andrewdoh. ([\matrix-org#13374](matrix-org#13374))
- Fix bug in handling of typing events for appservices. Contributed by Nick @ Beeper (@Fizzadar). ([\matrix-org#13392](matrix-org#13392))
- Fix a bug introduced in Synapse 1.57.0 where rooms listed in `exclude_rooms_from_sync` in the configuration file would not be properly excluded from incremental syncs. ([\matrix-org#13408](matrix-org#13408))
- Fix a bug in the experimental faster-room-joins support which could cause it to get stuck in an infinite loop. ([\matrix-org#13353](matrix-org#13353))
- Faster room joins: fix a bug which caused rejected events to become un-rejected during state syncing. ([\matrix-org#13413](matrix-org#13413))
- Faster room joins: fix error when running out of servers to sync partial state with, so that Synapse raises the intended error instead. ([\matrix-org#13432](matrix-org#13432))

Updates to the Docker image
---------------------------

- Make Docker images build on armv7 by installing cryptography dependencies in the 'requirements' stage. Contributed by Jasper Spaans. ([\matrix-org#13372](matrix-org#13372))

Improved Documentation
----------------------

- Update the 'registration tokens' page to acknowledge that the relevant MSC was merged into version 1.2 of the Matrix specification. Contributed by @moan0s. ([\matrix-org#11897](matrix-org#11897))
- Document which HTTP resources support gzip compression. ([\matrix-org#13221](matrix-org#13221))
- Add steps describing how to elevate an existing user to administrator by manipulating the database. ([\matrix-org#13230](matrix-org#13230))
- Fix wrong headline for `url_preview_accept_language` in documentation. ([\matrix-org#13437](matrix-org#13437))
- Remove redundant 'Contents' section from the Configuration Manual. Contributed by @dklimpel. ([\matrix-org#13438](matrix-org#13438))
- Update documentation for config setting `macaroon_secret_key`. ([\matrix-org#13443](matrix-org#13443))
- Update outdated information on `sso_mapping_providers` documentation. ([\matrix-org#13449](matrix-org#13449))
- Fix example code in module documentation of `password_auth_provider_callbacks`. ([\matrix-org#13450](matrix-org#13450))
- Make the configuration for the cache clearer. ([\matrix-org#13481](matrix-org#13481))

Internal Changes
----------------

- Extend the release script to automatically push a new SyTest branch, rather than having that be a manual process. ([\matrix-org#12978](matrix-org#12978))
- Make minor clarifications to the error messages given when we fail to join a room via any server. ([\matrix-org#13160](matrix-org#13160))
- Enable Complement CI tests in the 'latest deps' test run. ([\matrix-org#13213](matrix-org#13213))
- Fix long-standing bugged logic which was never hit in `get_pdu` asking every remote destination even after it finds an event. ([\matrix-org#13346](matrix-org#13346))
- Faster room joins: avoid blocking when pulling events with partially missing prev events. ([\matrix-org#13355](matrix-org#13355))
- Instrument `/messages` for understandable traces in Jaeger. ([\matrix-org#13368](matrix-org#13368))
- Remove an unused argument to `get_relations_for_event`. ([\matrix-org#13383](matrix-org#13383))
- Add a `merge-back` command to the release script, which automates merging the correct branches after a release. ([\matrix-org#13393](matrix-org#13393))
- Adding missing type hints to tests. ([\matrix-org#13397](matrix-org#13397))
- Faster Room Joins: don't leave a stuck room partial state flag if the join fails. ([\matrix-org#13403](matrix-org#13403))
- Refactor `_resolve_state_at_missing_prevs` to compute an `EventContext` instead. ([\matrix-org#13404](matrix-org#13404), [\matrix-org#13431](matrix-org#13431))
- Faster Room Joins: prevent Synapse from answering federated join requests for a room which it has not fully joined yet. ([\matrix-org#13416](matrix-org#13416))
- Re-enable running Complement tests against Synapse with workers. ([\matrix-org#13420](matrix-org#13420))
- Prevent unnecessary lookups to any external `get_event` cache. Contributed by Nick @ Beeper (@Fizzadar). ([\matrix-org#13435](matrix-org#13435))
- Add some tracing to give more insight into local room joins. ([\matrix-org#13439](matrix-org#13439))
- Rename class `RateLimitConfig` to `RatelimitSettings` and `FederationRateLimitConfig` to `FederationRatelimitSettings`. ([\matrix-org#13442](matrix-org#13442))
- Add some comments about how event push actions are stored. ([\matrix-org#13445](matrix-org#13445), [\matrix-org#13455](matrix-org#13455))
- Improve rebuild speed for the "synapse-workers" docker image. ([\matrix-org#13447](matrix-org#13447))
- Fix `@tag_args` being off-by-one with the arguments when tagging a span (tracing). ([\matrix-org#13452](matrix-org#13452))
- Update type of `EventContext.rejected`. ([\matrix-org#13460](matrix-org#13460))
- Use literals in place of `HTTPStatus` constants in tests. ([\matrix-org#13463](matrix-org#13463), [\matrix-org#13469](matrix-org#13469))
- Correct a misnamed argument in state res v2 internals. ([\matrix-org#13467](matrix-org#13467))
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