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https://wearezeta.atlassian.net/browse/WPB-21964

Checklist

  • Add a new entry in an appropriate subdirectory of changelog.d
  • Read and follow the PR guidelines

@blackheaven blackheaven requested review from a team as code owners January 22, 2026 17:01
@zebot zebot added the ok-to-test Approved for running tests in CI, overrides not-ok-to-test if both labels exist label Jan 22, 2026
@blackheaven blackheaven force-pushed the gdifolco/WPB-21964-extract-create-conversations-wire-subsystems branch 5 times, most recently from 1e8e214 to e7b9141 Compare January 28, 2026 11:14
@battermann battermann requested a review from Copilot January 29, 2026 07:16
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Pull request overview

This PR refactors conversation creation logic by moving it from Galley to the wire-subsystems library, aligning with the architectural goal of separating concerns into reusable subsystems.

Changes:

  • Moved conversation creation logic from Galley.API.Create to Wire.ConversationSubsystem.Interpreter
  • Relocated utility modules: Galley.API.ErrorGalley.Types.Error, Galley.API.One2OneWire.ConversationSubsystem.One2One, Galley.API.UtilWire.ConversationSubsystem.Util, Galley.Effects.ClientStoreWire.Effects.ClientStore
  • Removed Galley.Validation module (functionality moved to interpreter)
  • Updated background-worker to include new dependencies and error handlers
  • Updated imports across numerous files to reflect module movements

Reviewed changes

Copilot reviewed 63 out of 64 changed files in this pull request and generated 7 comments.

Show a summary per file
File Description
services/galley/src/Galley/API/Create.hs Simplified to delegate conversation creation to subsystem
libs/wire-subsystems/src/Wire/ConversationSubsystem/Interpreter.hs New implementation containing conversation creation logic
libs/wire-subsystems/src/Wire/ConversationSubsystem/Util.hs Utility functions moved from Galley
libs/wire-subsystems/src/Wire/ConversationSubsystem/Federation.hs New module for federation-related conversation logic
libs/wire-subsystems/src/Wire/ConversationSubsystem/Types.hs Configuration types for conversation subsystem
services/background-worker/src/Wire/BackgroundWorker/Jobs/Registry.hs Updated to support new conversation subsystem dependencies
libs/galley-types/src/Galley/Types/Error.hs Error types moved to galley-types library
services/galley/src/Galley/Effects.hs Reordered effect stack and added new error types
Multiple import updates Updated imports across ~30 files to reflect module movements

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Great effort! Thanks!. I feel there is more to do and to be said to get this really clean, so here are a few comments already.

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Not sure if we just want to move this code, or maybe make it its own subsystem?

Comment on lines +122 to +203
. mapError (const ("Invalid input" :: Text) :: InvalidInput -> Text)
. mapError @MigrationError (T.pack . show)
. mapError @InternalError (TL.toStrict . internalErrorDescription)
. mapError @UnreachableBackends (T.pack . show)
. mapError @NonFederatingBackends (T.pack . show)
. mapError @TeamCollaboratorsError (const ("Team collaborators error" :: Text))
. mapError @TeamFeatureStoreError (const ("Team feature store error" :: Text))
. mapError @(Tagged OperationDenied ()) (const ("Operation denied" :: Text))
. mapError @(Tagged 'NotATeamMember ()) (const ("Not a team member" :: Text))
. mapError @(Tagged 'ConvAccessDenied ()) (const ("Conversation access denied" :: Text))
. mapError @(Tagged 'NotConnected ()) (const ("Not connected" :: Text))
. mapError @(Tagged 'MLSNotEnabled ()) (const ("MLS not enabled" :: Text))
. mapError @(Tagged 'MLSNonEmptyMemberList ()) (const ("MLS non-empty member list" :: Text))
. mapError @(Tagged 'MissingLegalholdConsent ()) (const ("Missing legalhold consent" :: Text))
. mapError @(Tagged 'NonBindingTeam ()) (const ("Non-binding team" :: Text))
. mapError @(Tagged 'NoBindingTeamMembers ()) (const ("No binding team members" :: Text))
. mapError @(Tagged 'TeamNotFound ()) (const ("Team not found" :: Text))
. mapError @(Tagged 'InvalidOperation ()) (const ("Invalid operation" :: Text))
. mapError @(Tagged 'ConvNotFound ()) (const ("Conversation not found" :: Text))
. mapError @(Tagged 'ChannelsNotEnabled ()) (const ("Channels not enabled" :: Text))
. mapError @(Tagged 'NotAnMlsConversation ()) (const ("Not an MLS conversation" :: Text))
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This seems verbose and like some duplication. Don't we have instances for these somewhere. Can we reuse them? Or can this be extracted into a singel mapping function?

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in galley they are converted to http errors, should we somehow group them?

Comment on lines +79 to +73
let remoteDomains = void <$> snd (partitionQualified lusr $ newConv.newConvQualifiedUsers)
enforceFederationProtocol (baseProtocolToProtocol newConv.newConvProtocol) remoteDomains
checkFederationStatus (RemoteDomains $ Set.fromList remoteDomains)
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I wonder if checking the federation status should be implemented in a Federation subsystem, and if the conversation subsystem interpreter should be using it instead of having this here? Should that be part of this PR, too?

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Does the new design answers your questions?

@blackheaven blackheaven force-pushed the gdifolco/WPB-21964-extract-create-conversations-wire-subsystems branch from 9402379 to 4614d96 Compare January 29, 2026 18:52
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4 participants