Synapse 1.55.0 (2022-03-22)

This release removes a workaround introduced in Synapse 1.50.0 for Mjolnir compatibility. This breaks compatibility with Mjolnir 1.3.1 and earlier. (#11700); Mjolnir users should upgrade Mjolnir before upgrading Synapse to this version.

This release also moves the location of the synctl script; see the upgrade notes for more details.

Internal Changes

• Tweak copy for default Single Sign-On account details template to better adhere to mobile app store guidelines. (#12265, #12260)

Synapse 1.55.0rc1 (2022-03-15)

Features

• Add third-party rules callbacks check_can_shutdown_room and check_can_deactivate_user. (#12028)
• Improve performance of logging in for large accounts. (#12132)
• Add experimental env var SYNAPSE_ASYNC_IO_REACTOR that causes Synapse to use the asyncio reactor for Twisted. (#12135)
• Support the stable identifiers from MSC3440: threads. (#12151)
• Add a new Jinja2 template filter to extract the local part of an email address. (#12212)

Bugfixes

• Use the proper serialization format for bundled thread aggregations. The bug has existed since Synapse v1.48.0. (#12090)
• Fix a long-standing bug when redacting events with relations. (#12113, #12121, #12130, #12189)
• Fix a bug introduced in Synapse 1.7.2 whereby background updates are never run with the default background batch size. (#12157)
• Fix a bug where non-standard information was returned from the /hierarchy API. Introduced in Synapse v1.41.0. (#12175)
• Fix a bug introduced in Synapse 1.54.0 that broke background updates on sqlite homeservers while search was disabled. (#12215)
• Fix a long-standing bug when a filter argument with event_fields which did not include the unsigned field could result in a 500 error on /sync. (#12234)

Improved Documentation

• Fix complexity checking config example in Resource Constrained Devices docs page. (#11998)
• Improve documentation for demo scripts. (#12143)
• Updates to the Room DAG concepts development document. (#12179)
• Document that the typing, to_device, account_data, receipts, and presence stream writer can only be used on a single worker. (#12196)
• Document that contributors can sign off privately by email. (#12204)

Deprecations and Removals

• Remove workaround introduced in Synapse 1.50.0 for Mjolnir compatibility. Breaks compatibility with Mjolnir 1.3.1 and earlier. (#11700)
• synctl has been moved into into synapse._scripts and is exposed as an entry point; see upgrade notes. (#12140)
• Remove backwards compatibilty with pagination tokens from the /relations and /aggregations endpoints generated from Synapse < v1.52.0. (#12138)
• The groups/communities feature in Synapse has been deprecated. (#12200)

Internal Changes

• Simplify the ApplicationService class' set of public methods related to interest checking. (#11915)
• Add config settings for background update parameters. (#11980)
• Correct type hints for txredis. (#12042)
• Limit the size of aggregation_key on annotations. (#12101)
• Add type hints to tests files. (#12108, #12146, #12207, #12208)
• Move scripts to Synapse package and expose as setuptools entry points. (#12118)
• Add support for cancellation to ReadWriteLock. (#12120)
• Fix data validation to compare to lists, not sequences. (#12128)
• Fix CI not attaching source distributions and wheels to the GitHub releases. (#12131)
• Remove unused mocks from test_typing. (#12136)
• Give scripts-dev scripts suffixes for neater CI config. (#12137)
• Move the snapcraft configuration file to contrib. (#12142)
• Enable MSC3030 Complement tests in CI. (#12144)
• Enable MSC2716 Complement tests in CI. (#12145)
• Add test for ObservableDeferred's cancellation behaviour. (#12149)
• Use ParamSpec in type hints for synapse.logging.context. (#12150)
• Prune unused jobs from tox config. (#12152)
• Move CI checks out of tox, to facilitate a move to using poetry. (#12153)
• Avoid generating state groups for local out-of-band leaves. (#12154)
• Avoid trying to calculate the state at outlier events. (#12155, #12173, #12202)
• Fix some type annotations. (#12156)
• Add type hints for ObservableDeferred attributes. (#12159)
• Use a prebuilt Action for the tests-done CI job. (#12161)
• Reduce number of DB queries made during processing of /sync. (#12163)
• Add delay_cancellation utility function, which behaves like stop_cancellation but waits until the original Deferred resolves before raising a CancelledError. (#12180)
• Retry HTTP replication failures, this should prevent 502's when restarting stateful workers (main, event persisters, stream writers). Contributed by Nick @ Beeper. (#12182)
• Add cancellation support to @cached and @cachedList decorators. (#12183)
• Remove unused variables. (#12187)
• Add combined test for HTTP pusher and push rule. Contributed by Nick @ Beeper. (#12188)
• Rename HomeServer.get_tcp_replication to get_replication_command_handler. (#12192)
• Remove some dead code. (#12197)
• Fix a misleading comment in the function check_event_for_spam. (#12203)
• Remove unnecessary pass statements. (#12206)
• Update the SSO username picker template to comply with SIWA guidelines. (#12210)
• Improve code documentation for the typing stream over replication. (#12211)