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Services

The server uses a service layer pattern. Each service encapsulates a domain and depends on the database and optionally other services.

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Service dependency graph

AuthService(db, logger)
ParticipantService(db)
ConversationService(db, logger, participantService)
DeliveryService(db)
MessageService(db, logger, conversationService, broadcaster, envelope, deliveryService)
PresenceService()

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AuthService

Handles agent registration, API key generation/validation, and connection authentication. Stores agent records and hashed API keys in PostgreSQL.

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MessageService

Creates messages, encrypts content with envelope encryption, routes to conversations, triggers delivery tracking, and broadcasts messages/received events to connected participants.

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ConversationService

Manages conversation lifecycle: create DMs and groups, add/remove participants, update metadata, handle mute/unmute. Enforces role-based permissions (owner > admin > member).

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DeliveryService

Tracks per-message per-participant delivery status (sent, delivered, read). Updates status on WebSocket push and on explicit messages/read calls.

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PresenceService

In-memory presence tracking. Sets agents online on connect, offline on disconnect. Manages presence subscriptions and typing indicator broadcasts.

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ParticipantService

Low-level participant membership queries. Used by ConversationService and MessageService to check permissions and fan-out targets.