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EchoHub
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<h5 class="offcanvas-title" id="tocOffcanvasLabel">Table of Contents</h5>
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<article data-uid="">
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<h1 id="connection">Connection</h1>
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<h2 id="signalr-client-connection">SignalR Client Connection</h2>
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<p>After authentication, the TUI client establishes a SignalR WebSocket, registers
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event handlers, joins the default channel, and loads history.</p>
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<pre><code class="lang-mermaid">sequenceDiagram
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participant CM as ConnectionManager
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participant EHC as EchoHubConnection
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participant Hub as ChatHub
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participant CS as ChatService
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participant PT as PresenceTracker
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participant DB as SQLite
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CM->>CM: Fetch encryption key (GET /api/server/encryption-key)
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CM->>EHC: new EchoHubConnection(apiClient, encryption)
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EHC->>EHC: Build HubConnection (URL + JWT token provider + auto-reconnect)
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EHC->>EHC: RegisterHandlers() — wire ReceiveMessage, UserJoined, etc.
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EHC->>Hub: ConnectAsync() → WebSocket handshake
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Hub->>CS: UserConnectedAsync(connectionId, userId, username)
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CS->>PT: UserConnected(connectionId, userId, username)
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CS->>DB: Update user: Status=Online, LastSeenAt=now
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CM->>CM: Fetch channel list (GET /api/channels)
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CM->>EHC: JoinChannelAsync("general")
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EHC->>Hub: InvokeAsync("JoinChannel", "general")
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Hub->>CS: JoinChannelAsync(connectionId, userId, username, "general")
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CS->>DB: EnsureChannelMembership
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CS->>PT: JoinChannel(username, "general")
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CS->>CS: BroadcastToAllAsync → UserJoined
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CS->>DB: Fetch message history
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Hub-->>EHC: List<MessageDto> (encrypted)
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EHC-->>CM: Decrypted history
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</code></pre>
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<p><strong>Code references:</strong></p>
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<table>
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<thead>
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<tr>
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<th>Step</th>
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<th>File</th>
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<th>Location</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>Connection orchestration</td>
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<td><code>src/EchoHub.Client/Services/ConnectionManager.cs</code></td>
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<td>Lines 58-140 (<code>ConnectAsync</code>)</td>
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</tr>
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<tr>
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<td>EchoHubConnection setup</td>
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<td><code>src/EchoHub.Client/Services/EchoHubConnection.cs</code></td>
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<td>Lines 29-62 (constructor)</td>
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</tr>
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<tr>
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<td>Handler registration</td>
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<td><code>src/EchoHub.Client/Services/EchoHubConnection.cs</code></td>
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<td>Lines 64-122 (<code>RegisterHandlers</code>)</td>
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</tr>
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<tr>
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<td>Hub OnConnected</td>
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<td><code>src/EchoHub.Server/Hubs/ChatHub.cs</code></td>
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<td>Lines 31-43</td>
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</tr>
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<tr>
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<td>ChatService connected</td>
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<td><code>src/EchoHub.Server/Services/ChatService.cs</code></td>
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<td>Lines 41-57</td>
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</tr>
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<tr>
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<td>PresenceTracker connect</td>
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<td><code>src/EchoHub.Server/Services/PresenceTracker.cs</code></td>
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<td>Lines 13-29</td>
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</tr>
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<tr>
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<td>Join channel (hub)</td>
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<td><code>src/EchoHub.Server/Hubs/ChatHub.cs</code></td>
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<td>Lines 59-81</td>
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</tr>
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<tr>
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<td>Join channel (service)</td>
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<td><code>src/EchoHub.Server/Services/ChatService.cs</code></td>
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<td>Lines 96-135</td>
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</tr>
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</tbody>
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</table>
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<hr>
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<h2 id="irc-client-connection">IRC Client Connection</h2>
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<p>IRC clients connect via TCP, authenticate with PASS/NICK/USER or SASL PLAIN,
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and auto-join channels. New usernames are auto-registered.</p>
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<pre><code class="lang-mermaid">sequenceDiagram
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participant IRC as IRC Client
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participant GW as IrcGatewayService
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participant CH as IrcCommandHandler
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participant US as UserService
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participant CS as ChatService
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participant PT as PresenceTracker
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IRC->>GW: TCP connect (:6667 or :6697 TLS)
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GW->>GW: Accept + create IrcClientConnection
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GW->>CH: new IrcCommandHandler(connection, services)
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GW->>CH: RunAsync() — start read loop
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alt SASL PLAIN
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IRC->>CH: CAP REQ :sasl
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CH-->>IRC: CAP ACK :sasl
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IRC->>CH: AUTHENTICATE PLAIN
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CH-->>IRC: AUTHENTICATE +
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IRC->>CH: AUTHENTICATE <base64(\0user\0pass)>
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CH->>US: AuthenticateUserAsync(user, pass)
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alt Auth fails → auto-register
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CH->>US: RegisterUserAsync(user, pass)
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end
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CH-->>IRC: 903 :SASL authentication successful
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else PASS/NICK/USER
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IRC->>CH: PASS <password>
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IRC->>CH: NICK <nickname>
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IRC->>CH: USER <username> 0 * :<realname>
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CH->>US: AuthenticateUserAsync(nick, pass)
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alt Auth fails → auto-register
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CH->>US: RegisterUserAsync(nick, pass)
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end
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end
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CH->>CS: UserConnectedAsync(irc-{guid}, userId, username)
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CS->>PT: UserConnected(irc-{guid}, userId, username)
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CH-->>IRC: 001-004 RPL_WELCOME burst + MOTD
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Note over IRC,CH: Client is now ready for JOIN/PART/PRIVMSG
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</code></pre>
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<p><strong>Code references:</strong></p>
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<table>
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<thead>
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<tr>
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<th>Step</th>
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<th>File</th>
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<th>Location</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>TCP listener</td>
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<td><code>src/EchoHub.Server.Irc/IrcGatewayService.cs</code></td>
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<td>Lines 45-90 (<code>ExecuteAsync</code>)</td>
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</tr>
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<tr>
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<td>Client handler</td>
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<td><code>src/EchoHub.Server.Irc/IrcGatewayService.cs</code></td>
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<td>Lines 92-154 (<code>HandleClientAsync</code>)</td>
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</tr>
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<tr>
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<td>Command read loop</td>
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<td><code>src/EchoHub.Server.Irc/IrcCommandHandler.cs</code></td>
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<td>Lines 40-98 (<code>RunAsync</code>)</td>
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</tr>
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<tr>
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<td>SASL auth</td>
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<td><code>src/EchoHub.Server.Irc/IrcCommandHandler.cs</code></td>
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<td>Lines 136-207 (<code>HandleAuthenticateAsync</code>)</td>
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</tr>
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<tr>
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<td>PASS/NICK/USER</td>
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<td><code>src/EchoHub.Server.Irc/IrcCommandHandler.cs</code></td>
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<td>Lines 209-267</td>
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</tr>
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<tr>
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<td>Registration completion</td>
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<td><code>src/EchoHub.Server.Irc/IrcCommandHandler.cs</code></td>
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<td>Lines 268-315 (<code>TryCompleteRegistrationAsync</code>)</td>
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</tr>
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<tr>
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<td>Cleanup on disconnect</td>
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<td><code>src/EchoHub.Server.Irc/IrcGatewayService.cs</code></td>
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<td>Lines 136-153</td>
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</tr>
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</tbody>
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</table>
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<hr>
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<h2 id="user-disconnect--presence">User Disconnect & Presence</h2>
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<p>When a client disconnects, the presence tracker determines if the user has any
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remaining connections. If not, status is set to Invisible and all channels are
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notified.</p>
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<pre><code class="lang-mermaid">sequenceDiagram
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participant Client as Client
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participant Entry as ChatHub / IrcGatewayService
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participant CS as ChatService
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participant PT as PresenceTracker
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participant DB as SQLite
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participant SRB as SignalRBroadcaster
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Client->>Entry: Disconnect / TCP close
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Entry->>CS: UserDisconnectedAsync(connectionId)
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CS->>PT: Get username + channels (before removal)
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CS->>PT: UserDisconnected(connectionId)
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PT->>PT: Remove connection from tracking
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alt No remaining connections for user
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CS->>DB: Update user: Status=Invisible, LastSeenAt=now
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loop For each channel user was in
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CS->>CS: BroadcastToAllAsync(SendUserStatusChangedAsync)
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CS->>SRB: Notify channel members
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end
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end
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</code></pre>
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<p><strong>Code references:</strong></p>
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<table>
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<thead>
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<tr>
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<th>Step</th>
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<th>File</th>
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<th>Location</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>SignalR disconnect</td>
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<td><code>src/EchoHub.Server/Hubs/ChatHub.cs</code></td>
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<td>Lines 45-57</td>
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</tr>
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<tr>
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<td>IRC cleanup</td>
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<td><code>src/EchoHub.Server.Irc/IrcGatewayService.cs</code></td>
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<td>Lines 136-153</td>
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</tr>
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<tr>
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<td>ChatService disconnect</td>
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<td><code>src/EchoHub.Server/Services/ChatService.cs</code></td>
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<td>Lines 59-94</td>
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</tr>
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<tr>
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<td>Presence disconnect</td>
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<td><code>src/EchoHub.Server/Services/PresenceTracker.cs</code></td>
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<td>Lines 31-53</td>
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</tr>
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</tbody>
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</table>
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