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Merge pull request #86 from MobileNativeFoundation/chat/websockets
Set Up Backend For Chat
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8 changes: 8 additions & 0 deletions
8
...er/src/main/kotlin/org/mobilenativefoundation/trails/backend/server/plugins/WebSockets.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| package org.mobilenativefoundation.trails.backend.server.plugins | ||
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| import io.ktor.server.application.* | ||
| import io.ktor.server.websocket.* | ||
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| fun Application.configureWebSockets() { | ||
| install(WebSockets) | ||
| } |
96 changes: 96 additions & 0 deletions
96
...ver/src/main/kotlin/org/mobilenativefoundation/trails/backend/server/routes/ChatRoutes.kt
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,96 @@ | ||
| package org.mobilenativefoundation.trails.backend.server.routes | ||
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| import io.ktor.http.* | ||
| import io.ktor.server.response.* | ||
| import io.ktor.server.routing.* | ||
| import io.ktor.server.websocket.* | ||
| import io.ktor.websocket.* | ||
| import kotlinx.coroutines.channels.consumeEach | ||
| import kotlinx.datetime.* | ||
| import kotlinx.serialization.Serializable | ||
| import kotlinx.serialization.encodeToString | ||
| import kotlinx.serialization.json.Json | ||
| import org.mobilenativefoundation.trails.backend.server.TrailsDatabase | ||
| import java.util.concurrent.ConcurrentHashMap | ||
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| class ChatRoutes(private val trailsDatabase: TrailsDatabase) { | ||
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| private val chatSessionConnections = ConcurrentHashMap<Int, ConcurrentHashMap<Int, DefaultWebSocketServerSession>>() | ||
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| fun Route.chat() { | ||
| webSocket("/chat/{chatSessionId}/{userId}") { | ||
| val chatSessionId = call.parameters["chatSessionId"]?.toIntOrNull() | ||
| val userId = call.parameters["userId"]?.toIntOrNull() | ||
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| if (userId == null) { | ||
| call.respond(HttpStatusCode.BadRequest, "Invalid or missing user ID.") | ||
| return@webSocket | ||
| } | ||
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| if (chatSessionId == null) { | ||
| call.respond(HttpStatusCode.BadRequest, "Invalid or missing chat session ID.") | ||
| return@webSocket | ||
| } | ||
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| val chatSessionParticipantIds = | ||
| trailsDatabase.chatQueries.getParticipantsByChatSessionId(chatSessionId).executeAsList() | ||
| val isParticipant = userId in chatSessionParticipantIds | ||
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| if (!isParticipant) { | ||
| close(CloseReason(CloseReason.Codes.VIOLATED_POLICY, "Unauthorized")) | ||
| return@webSocket | ||
| } | ||
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| val connections = chatSessionConnections.getOrPut(chatSessionId) { | ||
| ConcurrentHashMap() | ||
| } | ||
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| connections[userId] = this | ||
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| try { | ||
| incoming.consumeEach { frame -> | ||
| if (frame is Frame.Text) { | ||
| val receivedText = frame.readText() | ||
| val chatMessage = Json.decodeFromString<ChatMessage>(receivedText) | ||
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| // Store the message in the database | ||
| trailsDatabase.chatQueries.insertChatMessage( | ||
| chat_session_id = chatSessionId, | ||
| from_user_id = userId, | ||
| content = chatMessage.content, | ||
| timestamp = chatMessage.timestamp.toJavaLocalDateTime() | ||
| ) | ||
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| // Send the message to all active participants in the chat session | ||
| connections.forEach { (participantId, session) -> | ||
| if (participantId != userId) { | ||
| session.send( | ||
| Frame.Text( | ||
| Json.encodeToString(chatMessage) | ||
| ) | ||
| ) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } catch (e: Exception) { | ||
| println("Error for user $userId: ${e.localizedMessage}.") | ||
| } finally { | ||
| print("User disconnected: $userId.") | ||
| connections.remove(userId) | ||
| if (connections.isEmpty()) { | ||
| chatSessionConnections.remove(chatSessionId) | ||
| } | ||
| } | ||
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| } | ||
| } | ||
| } | ||
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| @Serializable | ||
| data class ChatMessage( | ||
| val chatSessionId: Int, | ||
| val fromUserId: Int, | ||
| val content: String, | ||
| val timestamp: LocalDateTime = Clock.System.now().toLocalDateTime(TimeZone.currentSystemDefault()) | ||
| ) |
34 changes: 34 additions & 0 deletions
34
backend/server/src/main/sqldelight/org/mobilenativefoundation/trails/backend/server/Chat.sq
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| CREATE TABLE chatSession( | ||
| id SERIAL PRIMARY KEY | ||
| ); | ||
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| CREATE TABLE chatSessionParticipant( | ||
| chat_session_id INT NOT NULL REFERENCES chatSession(id) ON DELETE CASCADE, | ||
| user_id INT NOT NULL REFERENCES user(id), | ||
| PRIMARY KEY (chat_session_id, user_id) | ||
| ); | ||
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| CREATE TABLE chatMessage( | ||
| id SERIAL PRIMARY KEY, | ||
| chat_session_id INT NOT NULL REFERENCES chatSession(id) ON DELETE CASCADE, | ||
| from_user_id INT NOT NULL REFERENCES user(id), | ||
| content TEXT NOT NULL, | ||
| timestamp TIMESTAMP NOT NULL | ||
| ); | ||
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| -- Queries | ||
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| getMessagesByChatSessionId: | ||
| SELECT * FROM chatMessage | ||
| WHERE chat_session_id = ? | ||
| ORDER BY timestamp ASC; | ||
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| insertChatMessage: | ||
| INSERT INTO chatMessage (chat_session_id, from_user_id, content, timestamp) VALUES (?, ?, ?, ?); | ||
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| insertChatSessionParticipant: | ||
| INSERT INTO chatSessionParticipant (chat_session_id, user_id) VALUES (?, ?); | ||
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| getParticipantsByChatSessionId: | ||
| SELECT user_id FROM chatSessionParticipant | ||
| WHERE chat_session_id = ?; |
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