如何实现 express-ws 路由

Question

更新：

我需要正确设置 express-ws：

const express = require('express');
let expressWs = require('express-ws');
expressWs = expressWs(express());
const app = expressWs.app;
const router = express.Router();

const createError = require('http-errors');
const path = require('path');
const cookieParser = require('cookie-parser');
const logger = require('morgan');
...
const playerHeadingRouter = require('./routes/playerHeading')(router, db);

连同我的路线模块：

module.exports = (router, db) => {
  router.get('/api/player/:id', (req, res, next) => {
    res.end();
  });

  router.ws('/api/player/:id', (ws, req) => {
    ws.on('message', function(msg) {
      const coords = JSON.parse(msg);
      db.any(`UPDATE "user" SET x = ${coords.x} WHERE id = ${req.params.id}`)
      db.any(`UPDATE "user" SET y = ${coords.y} WHERE id = ${req.params.id}`)
      db.any(`UPDATE "user" SET geom = ST_SetSRID(ST_MakePoint(x, y),27700) WHERE id = ${req.params.id}`)
        .then(() => {
          // success;
          console.log('msg', msg);
        })
        .catch(error => {
          // error;
          console.log('error', error);
        });
    });
    // socket
  });
}

现在，当我使用 chrome websockets 客户端时，我可以建立连接到：

ws://localhost:3001/api/player-heading/2

并从我的 express 服务器发送一个用于数据库查询的 msg。

Answer 1

如果您托管的是 websocket 端点，您将无法通过 HTTP 访问它。您需要使用 websocket 客户端连接到 ws:// 端点。您可以使用 Chrome 扩展程序 like this one 来执行此操作。