Commit Graph

254 Commits

Author SHA1 Message Date
Patrick Cloke d1eb1b96e8
Register the /devices endpoint on workers. (#9092) 2021-01-13 12:35:40 -05:00
Dirk Klimpel 7a2e9b549d
Remove user's avatar URL and displayname when deactivated. (#8932)
This only applies if the user's data is to be erased.
2021-01-12 16:30:15 -05:00
Jason Robinson c177faf5a9 Remove trailing whitespace to appease the linter
Signed-off-by: Jason Robinson <jasonr@matrix.org>
2021-01-11 23:55:44 +02:00
Jason Robinson 49c619a9a2 Simplify delete_forward_extremities_for_room_txn SQL
As per feedback.

Signed-off-by: Jason Robinson <jasonr@matrix.org>
2021-01-11 23:49:58 +02:00
Jason Robinson da16d06301 Address pr feedback
* docs updates
* prettify SQL
* add missing copyright
* cursor_to_dict
* update touched files copyright years

Signed-off-by: Jason Robinson <jasonr@matrix.org>
2021-01-11 23:43:58 +02:00
Erik Johnston c9195744a4
Move more encryption endpoints off master (#9068) 2021-01-11 18:01:27 +00:00
Erik Johnston 1315a2e8be
Use a chain cover index to efficiently calculate auth chain difference (#8868) 2021-01-11 16:09:22 +00:00
Erik Johnston 4e04435bda
Remove old tables after schema version bump (#9055)
These tables are unused, and can be dropped now the schema version has been bumped.
2021-01-11 13:58:19 +00:00
Erik Johnston 63f4990298
Ensure rejected events get added to some metadata tables (#9016)
Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com>
2021-01-11 13:57:33 +00:00
Jerin J Titus c21d8f1c1d
Drop last_used column from access_tokens (#9025)
* Dropped last_used column from access_tokens

Signed-off-by: Jerin J Titus <72017981+jerinjtitus@users.noreply.github.com>
2021-01-11 10:23:49 +00:00
Jason Robinson b52fb703f7 Don't try to use f-strings
Signed-off-by: Jason Robinson <jasonr@matrix.org>
2021-01-11 09:47:03 +02:00
Jason Robinson 2eb421b606 Merge branch 'develop' into jaywink/admin-forward-extremities 2021-01-09 22:00:04 +02:00
Jason Robinson 90ad4d443a Implement clearing cache after deleting forward extremities
Also run linter.

Signed-off-by: Jason Robinson <jasonr@matrix.org>
2021-01-09 21:57:41 +02:00
Erik Johnston fa5f5cbc74
Fix error handling during insertion of client IPs (#9051)
You can't continue using a transaction once an exception has been
raised, so catching and dropping the error here is pointless and just
causes more errors.
2021-01-08 14:15:20 +00:00
Jason Robinson 85c0999bfb Add Rooms admin forward extremities DELETE endpoint
Signed-off-by: Jason Robinson <jasonr@matrix.org>
2021-01-08 00:12:23 +02:00
Jason Robinson b849e46139 Add forward extremities endpoint to rooms admin API
GET /_synapse/admin/v1/rooms/<identifier>/forward_extremities now gets forward extremities for a room, returning count and the list of extremities.

Signed-off-by: Jason Robinson <jasonr@matrix.org>
2021-01-07 23:01:59 +02:00
Erik Johnston b530eaa262
Allow running sendToDevice on workers (#9044) 2021-01-07 20:19:26 +00:00
Erik Johnston 63593134a1
Some cleanups to device inbox store. (#9041) 2021-01-07 17:20:44 +00:00
Patrick Cloke 23d701864f
Improve the performance of calculating ignored users in large rooms (#9024)
This allows for efficiently finding which users ignore a particular
user.

Co-authored-by: Erik Johnston <erik@matrix.org>
2021-01-07 13:03:38 +00:00
Patrick Cloke 1c9a850562
Add type hints to the crypto module. (#8999) 2021-01-04 10:04:50 -05:00
Patrick Cloke 9999eb2d02
Add type hints to admin and room list handlers. (#8973) 2020-12-29 17:42:10 -05:00
Patrick Cloke d0c3c24eb2
Drop the unused local_invites table. (#8979)
This table has been unused since Synapse v1.17.0.
2020-12-29 07:26:29 -05:00
Patrick Cloke 5d4c330ed9
Allow re-using a UI auth validation for a period of time (#8970) 2020-12-18 07:33:57 -05:00
Brendan Abolivier f2783fc201
Use the simple dictionary in full text search for the user directory (#8959)
* Use the simple dictionary in fts for the user directory

* Clarify naming
2020-12-17 14:42:30 +01:00
Dirk Klimpel 06006058d7
Make search statement in List Room and User Admin API case-insensitive (#8931) 2020-12-17 10:43:37 +00:00
Patrick Cloke bd30cfe86a
Convert internal pusher dicts to attrs classes. (#8940)
This improves type hinting and should use less memory.
2020-12-16 11:25:30 -05:00
Patrick Cloke be2db93b3c
Do not assume that the contents dictionary includes history_visibility. (#8945) 2020-12-16 08:46:37 -05:00
Patrick Cloke b3a4b53587
Fix handling of stream tokens for push. (#8943)
Removes faulty assertions and fixes the logic to ensure the max
stream token is always set.
2020-12-15 10:41:34 -05:00
Dirk Klimpel 0a34cdfc66
Add number of local devices to Room Details Admin API (#8886) 2020-12-11 10:42:47 +00:00
Erik Johnston df4b1e9c74
Pass room_id to get_auth_chain_difference (#8879)
This is so that we can choose which algorithm to use based on the room ID.
2020-12-04 15:52:49 +00:00
Richard van der Hoff 0bac276890 UIA: offer only available auth flows
During user-interactive auth, do not offer password auth to users with no
password, nor SSO auth to users with no SSO.

Fixes #7559.
2020-12-02 18:54:15 +00:00
Richard van der Hoff 9edff901d1
Add missing `ordering` to background updates (#8850)
It's important that we make sure our background updates happen in a defined
order, to avoid disasters like #6923.

Add an ordering to all of the background updates that have landed since #7190.
2020-12-01 15:52:49 +00:00
Richard van der Hoff f8d13ca13d
Drop (almost) unused index on event_json (#8845) 2020-11-30 18:44:09 +00:00
Andrew Morgan d963c69ba5
Speed up remote invite rejection database call (#8815)
This is another PR that grew out of #6739.

The existing code for checking whether a user is currently invited to a room when they want to leave the room looks like the following:

f737368a26/synapse/handlers/room_member.py (L518-L540)

It calls `get_invite_for_local_user_in_room`, which will actually query *all* rooms the user has been invited to, before iterating over them and matching via the room ID. It will then return a tuple of a lot of information which we pull the event ID out of.

I need to do a similar check for knocking, but this code wasn't very efficient. I then tried to write a different implementation using `StateHandler.get_current_state` but this actually didn't work as we haven't *joined* the room yet - we've only been invited to it. That means that only certain tables in Synapse have our desired `invite` membership state. One of those tables is `local_current_membership`.

So I wrote a store method that just queries that table instead
2020-11-25 20:06:13 +00:00
Will Hunt 51338491c9
Improve appservice handler to send only the most recent read receipts when no stream_id is stored. (#8744)
* Make this line debug (it's noisy)

* Don't include from_key for presence if we are at 0

* Limit read receipts for all rooms to 100

* changelog.d/8744.bugfix

* Allow from_key to be None

* Update 8744.bugfix

* The from_key is superflous

* Update comment
2020-11-18 18:54:09 +00:00
Erik Johnston f737368a26
Add admin API for logging in as a user (#8617) 2020-11-17 10:51:25 +00:00
Andrew Morgan e8d0853739
Generalise _maybe_store_room_on_invite (#8754)
There's a handy function called maybe_store_room_on_invite which allows us to create an entry in the rooms table for a room and its version for which we aren't joined to yet, but we can reference when ingesting events about.

This is currently used for invites where we receive some stripped state about the room and pass it down via /sync to the client, without us being in the room yet.

There is a similar requirement for knocking, where we will eventually do the same thing, and need an entry in the rooms table as well. Thus, reusing this function works, however its name needs to be generalised a bit.

Separated out from #6739.
2020-11-13 16:24:04 +00:00
Erik Johnston 4cb00d297f
Cache event ID to auth event IDs lookups (#8752)
This should hopefully speed up `get_auth_chain_difference` a bit in the case of repeated state res on the same rooms.

`get_auth_chain_difference` does a breadth first walk of the auth graphs by repeatedly looking up events' auth events. Different state resolutions on the same room will end up doing a lot of the same event to auth events lookups, so by caching them we should speed things up in cases of repeated state resolutions on the same room.
2020-11-13 11:29:18 +00:00
Dirk Klimpel c3119d1536
Add an admin API for users' media statistics (#8700)
Add `GET /_synapse/admin/v1/statistics/users/media` to get statisics about local media usage by users.
Related to #6094
It is the first API for statistics.
Goal is to avoid/reduce usage of sql queries like [Wiki analyzing Synapse](https://github.com/matrix-org/synapse/wiki/SQL-for-analyzing-Synapse-PostgreSQL-database-stats)

Signed-off-by: Dirk Klimpel dirk@klimpel.org
2020-11-05 18:59:12 +00:00
Erik Johnston 1eb9de90c0
Improve start time by adding index to e2e_cross_signing_keys (#8694)
We do a `SELECT MAX(stream_id) FROM e2e_cross_signing_keys` on startup.
2020-11-02 13:55:56 +00:00
Brendan Abolivier 7a0fd6f98d
Fix error handling around when completing an AS transaction (#8693) 2020-10-30 16:50:48 +00:00
Erik Johnston 46f4be94b4
Fix race for concurrent downloads of remote media. (#8682)
Fixes #6755
2020-10-30 10:55:24 +00:00
Andrew Morgan 4504151546
Fix optional parameter in stripped state storage method (#8688)
Missed in #8671.
2020-10-30 00:22:31 +00:00
Erik Johnston f21e24ffc2
Add ability for access tokens to belong to one user but grant access to another user. (#8616)
We do it this way round so that only the "owner" can delete the access token (i.e. `/logout/all` by the "owner" also deletes that token, but `/logout/all` by the "target user" doesn't).

A future PR will add an API for creating such a token.

When the target user and authenticated entity are different the `Processed request` log line will be logged with a: `{@admin:server as @bob:server} ...`. I'm not convinced by that format (especially since it adds spaces in there, making it harder to use `cut -d ' '` to chop off the start of log lines). Suggestions welcome.
2020-10-29 15:58:44 +00:00
Richard van der Hoff c97da1e45d
Merge pull request #8678 from matrix-org/rav/fix_frozen_events
Fix serialisation errors when using third-party event rules.
2020-10-28 20:41:42 +00:00
Richard van der Hoff b6ca69e4f1 Remove frozendict_json_encoder and support frozendicts everywhere
Not being able to serialise `frozendicts` is fragile, and it's annoying to have
to think about which serialiser you want. There's no real downside to
supporting frozendicts, so let's just have one json encoder.
2020-10-28 15:56:57 +00:00
Patrick Cloke 31d721fbf6
Add type hints to application services. (#8655) 2020-10-28 11:12:21 -04:00
Erik Johnston a6ea1a957e
Don't pull event from DB when handling replication traffic. (#8669)
I was trying to make it so that we didn't have to start a background task when handling RDATA, but that is a bigger job (due to all the code in `generic_worker`). However I still think not pulling the event from the DB may help reduce some DB usage due to replication, even if most workers will simply go and pull that event from the DB later anyway.

Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com>
2020-10-28 12:11:45 +00:00
Andrew Morgan a699c044b6
Abstract code for stripping room state into a separate method (#8671)
This is a requirement for [knocking](https://github.com/matrix-org/synapse/pull/6739), and is abstracting some code that was originally used by the invite flow. I'm separating it out into this PR as it's a fairly contained change.

For a bit of context: when you invite a user to a room, you send them [stripped state events](https://matrix.org/docs/spec/server_server/unstable#put-matrix-federation-v2-invite-roomid-eventid) as part of `invite_room_state`. This is so that their client can display useful information such as the room name and avatar. The same requirement applies to knocking, as it would be nice for clients to be able to display a list of rooms you've knocked on - room name and avatar included.

The reason we're sending membership events down as well is in the case that you are invited to a room that does not have an avatar or name set. In that case, the client should use the displayname/avatar of the inviter. That information is located in the inviter's membership event.

This is optional as knocks don't really have any user in the room to link up to. When you knock on a room, your knock is sent by you and inserted into the room. It wouldn't *really* make sense to show the avatar of a random user - plus it'd be a data leak. So I've opted not to send membership events to the client here. The UX on the client for when you knock on a room without a name/avatar is a separate problem.

In essence this is just moving some inline code to a reusable store method.
2020-10-27 18:42:46 +00:00
Dirk Klimpel 9b7c28283a
Add admin API to list users' local media (#8647)
Add admin API `GET /_synapse/admin/v1/users/<user_id>/media` to get information of users' uploaded files.
2020-10-27 14:12:31 +00:00
Patrick Cloke 10f45d85bb
Add type hints for account validity handler (#8620)
This also fixes a bug by fixing handling of an account which doesn't expire.
2020-10-26 14:17:31 -04:00
Dirk Klimpel 66e6801c3e
Split admin API for reported events into a detail and a list view (#8539)
Split admin API for reported events in detail und list view.
API was introduced with #8217 in synapse v.1.21.0.

It makes the list (`GET /_synapse/admin/v1/event_reports`) less complex and provides a better overview.
The details can be queried with: `GET /_synapse/admin/v1/event_reports/<report_id>`.
It is similar to room and users API.

It is a kind of regression in `GET /_synapse/admin/v1/event_reports`.  `event_json` was removed. But the api was introduced one version before and it is an admin API (not under spec).

Signed-off-by: Dirk Klimpel dirk@klimpel.org
2020-10-26 18:16:37 +00:00
Dirk Klimpel 49d72dea2a
Add an admin api to delete local media. (#8519)
Related to: #6459, #3479

Add `DELETE /_synapse/admin/v1/media/<server_name>/<media_id>` to delete
a single file from server.
2020-10-26 17:02:28 +00:00
Erik Johnston ff7f0e8a14 Merge branch 'release-v1.22.0' into develop 2020-10-26 15:02:55 +00:00
Will Hunt 9e0f5a0ac4 Fix get|set_type_stream_id_for_appservice store functions (#8648) 2020-10-26 15:00:56 +00:00
Will Hunt e8dbbcb64c
Fix get|set_type_stream_id_for_appservice store functions (#8648) 2020-10-26 10:51:33 -04:00
Erik Johnston 437a99fb99
Fix user_daily_visits to not have duplicate rows for UA. (#8654)
* Fix user_daily_visits to not have duplicate rows for UA.

Fixes #8641.

* Newsfile

* Fix typo.

Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com>
2020-10-26 13:16:32 +00:00
Erik Johnston a9f90fa73a
Type hints for RegistrationStore (#8615) 2020-10-22 11:56:58 +01:00
Patrick Cloke de5cafe980
Add type hints to profile and base handlers. (#8609) 2020-10-21 06:44:31 -04:00
Patrick Cloke 9e0f22874f
Consistently use wrap_as_background_task in more places (#8599) 2020-10-20 11:29:38 -04:00
Will Hunt 626b8f0846
Move schema file for as_device_stream (#8590)
* Move schema file

* Add a .

* Add matching changelog entry

* Fix sqlite
2020-10-20 10:18:55 +01:00
Vasilis Gerakaris 34c20493b9
Drop unused `device_max_stream_id` table (#8589)
Signed-off-by: Vasilis Gerakaris <vasilis.gerakaris@navarino.gr>
2020-10-19 19:06:54 +01:00
Richard van der Hoff 903d11c43a
Add `DeferredCache.get_immediate` method (#8568)
* Add `DeferredCache.get_immediate` method

A bunch of things that are currently calling `DeferredCache.get` are only
really interested in the result if it's completed. We can optimise and simplify
this case.

* Remove unused 'default' parameter to DeferredCache.get()

* another get_immediate instance
2020-10-19 15:00:12 +01:00
Richard van der Hoff 97647b33c2
Replace DeferredCache with LruCache where possible (#8563)
Most of these uses don't need a full-blown DeferredCache; LruCache is lighter and more appropriate.
2020-10-19 12:20:29 +01:00
Patrick Cloke 1b70662be9
Clean-up old transaction IDs on the background worker. (#8544) 2020-10-16 12:06:17 -04:00
Will Hunt c276bd9969
Send some ephemeral events to appservices (#8437)
Optionally sends typing, presence, and read receipt information to appservices.
2020-10-15 12:33:28 -04:00
Richard van der Hoff 0a08cd1065
Merge pull request #8548 from matrix-org/rav/deferred_cache
Rename Cache to DeferredCache, and related changes
2020-10-15 11:42:07 +01:00
Neil Johnson 1f39155071
Include user agent in user daily visits table (#8503)
Include user agent in user daily visits table.
2020-10-15 10:36:40 +01:00
Richard van der Hoff 4182bb812f move DeferredCache into its own module 2020-10-14 23:38:14 +01:00
Richard van der Hoff 9f87da0a84 Rename Cache->DeferredCache 2020-10-14 23:38:14 +01:00
Erik Johnston 19b15d63e8
Use autocommit mode for single statement DB functions. (#8542)
Autocommit means that we don't wrap the functions in transactions, and instead get executed directly. Introduced in #8456. This will help:

1. reduce the number of `could not serialize access due to concurrent delete` errors that we see (though there are a few functions that often cause serialization errors that we don't fix here);
2. improve the DB performance, as it no longer needs to deal with the overhead of `REPEATABLE READ` isolation levels; and
3. improve wall clock speed of these functions, as we no longer need to send `BEGIN` and `COMMIT` to the DB.

Some notes about the differences between autocommit mode and our default `REPEATABLE READ` transactions:

1. Currently `autocommit` only applies when using PostgreSQL, and is ignored when using SQLite (due to silliness with [Twisted DB classes](https://twistedmatrix.com/trac/ticket/9998)).
2. Autocommit functions may get retried on error, which means they can get applied *twice* (or more) to the DB (since they are not in a transaction the previous call would not get rolled back). This means that the functions need to be idempotent (or otherwise not care about being called multiple times). Read queries, simple deletes, and updates/upserts that replace rows (rather than generating new values from existing rows) are all idempotent.
3. Autocommit functions no longer get executed in [`REPEATABLE READ`](https://www.postgresql.org/docs/current/transaction-iso.html) isolation level, and so data can change queries, which is fine for single statement queries.
2020-10-14 15:50:59 +01:00
Brendan Abolivier 3ee97a2748
Make sure a retention policy is a state event (#8527)
* Make sure a retention policy is a state event

* Changelog
2020-10-14 12:00:52 +01:00
Patrick Cloke 629a951b49
Move additional tasks to the background worker, part 4 (#8513) 2020-10-13 08:20:32 -04:00
Erik Johnston b2486f6656
Fix message duplication if something goes wrong after persisting the event (#8476)
Should fix #3365.
2020-10-13 12:07:56 +01:00
Erik Johnston 5009ffcaa4
Only send RDATA for instance local events. (#8496)
When pulling events out of the DB to send over replication we were not
filtering by instance name, and so we were sending events for other
instances.
2020-10-09 13:10:33 +01:00
Patrick Cloke fe0f4a3591
Move additional tasks to the background worker, part 3 (#8489) 2020-10-09 07:37:51 -04:00
Patrick Cloke a93f3121f8
Add type hints to some handlers (#8505) 2020-10-09 07:20:51 -04:00
Hubert Chathi a97cec18bb
Invalidate the cache when an olm fallback key is uploaded (#8501) 2020-10-08 13:24:46 -04:00
Patrick Cloke e4f72ddc44
Move additional tasks to the background worker (#8458) 2020-10-07 11:27:56 -04:00
Erik Johnston 52a50e8686
Use vector clocks for room stream tokens. (#8439)
Currently when using multiple event persisters we (in the worst case) don't tell clients about events until all event persisters have persisted new events after the original event. This is a suboptimal, especially if one of the event persisters goes down.

To handle this, we encode the position of each event persister in the room tokens so that we can send events to clients immediately. To reduce the size of the token we do two things:

1. We create a unique immutable persistent mapping between instance names and a generated small integer ID, which we can encode in the tokens instead of the instance name; and
2. We encode the "persisted upto position" of the room token and then only explicitly include instances that have positions strictly greater than that.

The new tokens look something like: `m3478~1.3488~2.3489`, where the first number is the min position, and the subsequent `-` separated pairs are the instance ID to positions map. (We use `.` and `~` as separators as they're URL safe and not already used by `StreamToken`).
2020-10-07 15:15:33 +01:00
Patrick Cloke b460a088c6
Add typing information to the device handler. (#8407) 2020-10-07 08:58:21 -04:00
Hubert Chathi 4cb44a1585
Add support for MSC2697: Dehydrated devices (#8380)
This allows a user to store an offline device on the server and
then restore it at a subsequent login.
2020-10-07 08:00:17 -04:00
Hubert Chathi 3cd78bbe9e
Add support for MSC2732: olm fallback keys (#8312) 2020-10-06 13:26:29 -04:00
Richard van der Hoff f31f8e6319
Remove stream ordering from Metadata dict (#8452)
There's no need for it to be in the dict as well as the events table. Instead,
we store it in a separate attribute in the EventInternalMetadata object, and
populate that on load.

This means that we can rely on it being correctly populated for any event which
has been persited to the database.
2020-10-05 14:43:14 +01:00
Patrick Cloke c5251c6fbd
Do not assume that account data is of the correct form. (#8454)
This fixes a bug where `m.ignored_user_list` was assumed to be a dict,
leading to odd behavior for users who set it to something else.
2020-10-05 09:28:05 -04:00
Erik Johnston e3debf9682
Add logging on startup/shutdown (#8448)
This is so we can tell what is going on when things are taking a while to start up.

The main change here is to ensure that transactions that are created during startup get correctly logged like normal transactions.
2020-10-02 15:20:45 +01:00
Erik Johnston ec10bdd32b
Speed up unit tests when using PostgreSQL (#8450) 2020-10-02 15:09:31 +01:00
Patrick Cloke 62894673e6
Allow background tasks to be run on a separate worker. (#8369) 2020-10-02 08:23:15 -04:00
Patrick Cloke 4ff0201e62
Enable mypy checking for unreachable code and fix instances. (#8432) 2020-10-01 08:09:18 -04:00
Erik Johnston 7941372ec8
Make token serializing/deserializing async (#8427)
The idea is that in future tokens will encode a mapping of instance to position. However, we don't want to include the full instance name in the string representation, so instead we'll have a mapping between instance name and an immutable integer ID in the DB that we can use instead. We'll then do the lookup when we serialize/deserialize the token (we could alternatively pass around an `Instance` type that includes both the name and ID, but that turns out to be a lot more invasive).
2020-09-30 20:29:19 +01:00
Richard van der Hoff 20e7c4de26 Add an improved "forward extremities" metric
Hopefully, N(extremities) * N(state_events) is a more realistic approximation
to "how big a problem is this room?".
2020-09-30 16:49:15 +01:00
Richard van der Hoff 6d2d42f8fb Rewrite BucketCollector
This was a bit unweildy for what I wanted: in particular, I wanted to assign
each measurement straight into a bucket, rather than storing an intermediate
Counter which didn't do any bucketing at all.

I've replaced it with something that is hopefully a bit easier to use.

(I'm not entirely sure what the difference between a HistogramMetricFamily and
a GaugeHistogramMetricFamily is, but given our counters can go down as well as
up the latter *sounds* more accurate?)
2020-09-30 16:49:15 +01:00
Erik Johnston ea70f1c362
Various clean ups to room stream tokens. (#8423) 2020-09-29 21:48:33 +01:00
Richard van der Hoff 2649d545a5
Mypy fixes for `synapse.handlers.federation` (#8422)
For some reason, an apparently unrelated PR upset mypy about this module. Here are a number of little fixes.
2020-09-29 15:57:36 +01:00
Will Hunt 8676d8ab2e
Filter out appservices from mau count (#8404)
This is an attempt to fix #8403.
2020-09-29 13:11:02 +01:00
Erik Johnston bd380d942f
Add checks for postgres sequence consistency (#8402) 2020-09-28 18:00:30 +01:00
Matthew Hodgson 4b3a1faa08 typo 2020-09-28 00:23:35 +01:00
Tdxdxoz abd04b6af0
Allow existing users to login via OpenID Connect. (#8345)
Co-authored-by: Benjamin Koch <bbbsnowball@gmail.com>

This adds configuration flags that will match a user to pre-existing users
when logging in via OpenID Connect. This is useful when switching to
an existing SSO system.
2020-09-25 07:01:45 -04:00
Erik Johnston 3e87d79e1c
Fix schema delta for servers that have not backfilled (#8396)
Fixes #8395.
2020-09-25 09:58:32 +01:00
Erik Johnston f112cfe5bb
Fix MultiWriteIdGenerator's handling of restarts. (#8374)
On startup `MultiWriteIdGenerator` fetches the maximum stream ID for
each instance from the table and uses that as its initial "current
position" for each writer. This is problematic as a) it involves either
a scan of events table or an index (neither of which is ideal), and b)
if rows are being persisted out of order elsewhere while the process
restarts then using the maximum stream ID is not correct. This could
theoretically lead to race conditions where e.g. events that are
persisted out of order are not sent down sync streams.

We fix this by creating a new table that tracks the current positions of
each writer to the stream, and update it each time we finish persisting
a new entry. This is a relatively small overhead when persisting events.
However for the cache invalidation stream this is a much bigger relative
overhead, so instead we note that for invalidation we don't actually
care about reliability over restarts (as there's no caches to
invalidate) and simply don't bother reading and writing to the new table
in that particular case.
2020-09-24 16:53:51 +01:00