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api-v1
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Added base chat routes & socket for communication

This commit is contained in:
Soham Chari 2025-12-14 11:07:54 +05:30
parent 05d1dfe718
commit 2cf6cf1772
5 changed files with 524 additions and 3 deletions
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264
package-lock.json generated
View File

@ -12,7 +12,29 @@
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"dotenv": "^17.2.3",
"express": "^5.1.0",
"pg": "^8.16.3"
"pg": "^8.16.3",
"socket.io": "^4.8.1"
}
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@ -194,6 +224,88 @@
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@ -845,6 +957,131 @@
"url": "https://github.com/sponsors/ljharb"
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@ -882,6 +1119,11 @@
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3
package.json
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@ -21,6 +21,7 @@
"cors": "^2.8.5",
"dotenv": "^17.2.3",
"express": "^5.1.0",
"pg": "^8.16.3"
"pg": "^8.16.3",
"socket.io": "^4.8.1"
}
}

196
routes/chatRoutes.js Normal file
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@ -0,0 +1,196 @@
import express from "express";
import pool from "../db/pool.js";
import { getIO, getSocketId } from "../socket.js";
const router = express.Router();
// 1. POST /conversations (Create or Get existing)
router.post("/conversations", async (req, res) => {
try {
// We expect explicit buyer/seller ID, or just two user IDs.
// Based on schema, we have buyer_id and seller_id.
// Ideally, the client sends which is which, or we just treat them as user1/user2 and check both permutations.
const { buyer_id, seller_id } = req.body;
if (!buyer_id || !seller_id) {
return res.status(400).json({ error: "buyer_id and seller_id are required" });
}
// Check if conversation exists (bidirectional check for robustness, although schema has specific columns)
const queryCheck = `
SELECT * FROM conversations
WHERE (buyer_id = $1 AND seller_id = $2)
OR (buyer_id = $2 AND seller_id = $1)
AND deleted = FALSE
`;
const checkResult = await pool.query(queryCheck, [buyer_id, seller_id]);
if (checkResult.rows.length > 0) {
return res.json(checkResult.rows[0]);
}
// Create new
const queryInsert = `
INSERT INTO conversations (buyer_id, seller_id)
VALUES ($1, $2)
RETURNING *
`;
const insertResult = await pool.query(queryInsert, [buyer_id, seller_id]);
res.status(201).json(insertResult.rows[0]);
} catch (err) {
console.error("Error creating/getting conversation:", err);
res.status(500).json({ error: "Internal server error" });
}
});
// 2. GET /conversations/user/:userId (Inbox)
router.get("/conversations/user/:userId", async (req, res) => {
try {
const { userId } = req.params;
// Fetch conversations where user is involved.
// Also fetch the OTHER user's name/avatar.
const queryText = `
SELECT
c.*,
CASE
WHEN c.buyer_id = $1 THEN u_seller.name
ELSE u_buyer.name
END as other_user_name,
CASE
WHEN c.buyer_id = $1 THEN u_seller.avatar_url
ELSE u_buyer.avatar_url
END as other_user_avatar,
CASE
WHEN c.buyer_id = $1 THEN u_seller.id
ELSE u_buyer.id
END as other_user_id
FROM conversations c
JOIN users u_buyer ON c.buyer_id = u_buyer.id
JOIN users u_seller ON c.seller_id = u_seller.id
WHERE (c.buyer_id = $1 OR c.seller_id = $1)
AND c.deleted = FALSE
ORDER BY c.updated_at DESC
`;
const result = await pool.query(queryText, [userId]);
res.json(result.rows);
} catch (err) {
console.error("Error fetching user conversations:", err);
res.status(500).json({ error: "Internal server error" });
}
});
// 3. GET /conversations/:conversationId/messages (History)
router.get("/conversations/:conversationId/messages", async (req, res) => {
try {
const { conversationId } = req.params;
const { limit = 50, offset = 0 } = req.query;
const queryText = `
SELECT
m.*,
cm.media_url,
cm.media_type as media_file_type,
cm.thumbnail_url
FROM messages m
LEFT JOIN conversation_media cm ON m.media_id = cm.id
WHERE m.conversation_id = $1
AND m.deleted = FALSE
ORDER BY m.created_at DESC
LIMIT $2 OFFSET $3
`;
const result = await pool.query(queryText, [conversationId, limit, offset]);
// Reverse for frontend if needed, but API usually sends standard order.
// Sending newest first (DESC) is common for pagination.
res.json(result.rows);
} catch (err) {
console.error("Error fetching messages:", err);
res.status(500).json({ error: "Internal server error" });
}
});
// 4. POST /messages (Send Message)
router.post("/messages", async (req, res) => {
const client = await pool.connect();
try {
await client.query("BEGIN");
const { conversation_id, sender_id, receiver_id, content, message_type = 'text', media } = req.body;
let media_id = null;
// Insert Media if present and message type allows it
if ((message_type === 'media' || message_type === 'both') && media) {
const insertMediaQuery = `
INSERT INTO conversation_media (media_type, media_url, thumbnail_url)
VALUES ($1, $2, $3)
RETURNING id
`;
const mediaResult = await client.query(insertMediaQuery, [media.media_type, media.media_url, media.thumbnail_url]);
media_id = mediaResult.rows[0].id;
}
// Insert Message
const insertMessageQuery = `
INSERT INTO messages (conversation_id, sender_id, receiver_id, message_type, content, media_id)
VALUES ($1, $2, $3, $4, $5, $6)
RETURNING *
`;
const messageResult = await client.query(insertMessageQuery, [conversation_id, sender_id, receiver_id, message_type, content, media_id]);
// Update conversation timestamp
const updateConvQuery = `UPDATE conversations SET updated_at = NOW() WHERE id = $1`;
await client.query(updateConvQuery, [conversation_id]);
await client.query("COMMIT");
// Real-time update via Socket.io
const receiverSocketId = getSocketId(receiver_id);
if (receiverSocketId) {
getIO().to(receiverSocketId).emit("receive_message", messageResult.rows[0]);
}
res.status(201).json(messageResult.rows[0]);
} catch (err) {
await client.query("ROLLBACK");
console.error("Error sending message:", err);
res.status(500).json({ error: "Internal server error" });
} finally {
client.release();
}
});
// 5. PUT /messages/:messageId/read (Mark Read)
router.put("/messages/:messageId/read", async (req, res) => {
try {
const { messageId } = req.params;
const queryText = `
UPDATE messages
SET is_read = TRUE, read_at = NOW()
WHERE id = $1
RETURNING *
`;
const result = await pool.query(queryText, [messageId]);
if (result.rows.length === 0) {
return res.status(404).json({ error: "Message not found" });
}
res.json(result.rows[0]);
// Real-time update via Socket.io to the sender (so they know it's read)
const updatedMessage = result.rows[0];
const senderId = updatedMessage.sender_id;
const senderSocketId = getSocketId(senderId);
if (senderSocketId) {
getIO().to(senderSocketId).emit("message_read", updatedMessage);
}
} catch (err) {
console.error("Error marking message as read:", err);
res.status(500).json({ error: "Internal server error" });
}
});
export default router;

10
server.js
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@ -10,10 +10,18 @@ const PORT = process.env.PORT || 3200;
// Add routes here
import listingRoutes from "./routes/listingRoutes.js";
import locationRoutes from "./routes/locationRoutes.js";
import chatRoutes from "./routes/chatRoutes.js";
app.use("/listings", listingRoutes);
app.use("/locations", locationRoutes);
app.use("/chat", chatRoutes);
import http from "http";
import { initSocket } from "./socket.js";
app.listen(PORT, () => {
const server = http.createServer(app);
initSocket(server);
server.listen(PORT, () => {
console.log(`BuySellService is running on port ${PORT}`);
});

54
socket.js Normal file
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@ -0,0 +1,54 @@
import { Server } from "socket.io";
let io;
const userSocketMap = new Map(); // userId -> socketId
// Initialize Socket.IO
export const initSocket = (server) => {
io = new Server(server, {
cors: {
origin: "*", // Adjust as needed for production
methods: ["GET", "POST"],
},
});
io.on("connection", (socket) => {
console.log("A user connected:", socket.id);
// Event for user to register their ID
socket.on("register", (userId) => {
if (userId) {
userSocketMap.set(userId, socket.id);
console.log(`Registered user ${userId} to socket ${socket.id}`);
}
});
socket.on("disconnect", () => {
console.log("User disconnected:", socket.id);
// Optional: Remove user from map. This is inefficient O(N).
// Better: keep reverse map or just iterate. Map iteration is okay for small scale.
for (const [userId, socketId] of userSocketMap.entries()) {
if (socketId === socket.id) {
userSocketMap.delete(userId);
console.log(`Unregistered user ${userId}`);
break;
}
}
});
});
return io;
};
// Get the IO instance
export const getIO = () => {
if (!io) {
throw new Error("Socket.io not initialized!");
}
return io;
};
// Get socket ID for a user
export const getSocketId = (userId) => {
return userSocketMap.get(userId);
};