"chat"

IM Chat & Contact/Group Architecture – Message Engine + Session Management + Group Permissions + Friend Relationship Full Chain

In-depth analysis of the client-side IM instant messaging system: from Message Meta-First Engine, SeqId Cursor Pagination, EventEmitter² Event Decoupling, to Group Management (Kick/Mute/Promote-Demote/Transfer/Dismiss), Friend Relationships (Apply/Process/Search State Machine), Group Join Request Approval Workflow, and WebRTC ICE Server Dynamic Credential Generation, covering 900+ lines of ChatService full source code.