node-lens/dist/adapters/express.mjs

Lens is a lightweight developer tool for Node.js apps that lets you log, view, and debug requests and other activity in real time — inspired by Laravel Telescope.

import {
  __dirname,
  getQueryByRequestId,
  getRecentQueries,
  getRecentRequests,
  getRequestById,
  getRequestId,
  logQuery,
  logRequest,
  runWithRequestId
} from "../chunk-7EU2ZT4R.mjs";

// src/adapters/express.ts
import express from "express";
import path from "path";

// src/logger/proxy.ts
function createProxy(client, options) {
  return new Proxy(client, {
    get(target, prop, receiver) {
      const original = Reflect.get(target, prop, receiver);
      if (typeof original !== "function") {
        return original;
      }
      return function(...args) {
        if (typeof prop === "string" && options.methods.includes(prop)) {
          logQuery({ query: args[0], durationMs: 100 });
        }
        return original.apply(target, args);
      };
    }
  });
}

// src/adapters/express.ts
async function middleware(req, res, next) {
  const requestId = crypto.randomUUID();
  runWithRequestId(requestId, () => {
    const memoryUsageMb = process.memoryUsage().rss / 1024 / 1024;
    const start = process.hrtime();
    res.on("finish", async () => {
      const end = process.hrtime(start);
      logRequest({
        method: req.method,
        status: res.statusCode,
        path: req.path,
        requestId,
        ip: req.ip ?? "-",
        memoryUsageMb,
        durationMs: end[0] * 1e3 + end[1] / 1e6,
        request: {
          headers: req.headers,
          body: req.body
        },
        response: {
          headers: res.getHeaders()
          // TODO: get response body
        }
      });
    });
    next();
  });
}
function routes() {
  const router = express.Router();
  const uiPath = path.resolve(__dirname, "..", "ui");
  router.use(express.static(uiPath));
  router.get("/api/requests", (_, res) => {
    res.json(getRecentRequests());
  });
  router.get("/api/requests/:id", (req, res) => {
    const { id } = req.params;
    res.json(getRequestById(id));
  });
  router.get("/api/queries", (_, res) => {
    res.json(getRecentQueries());
  });
  router.get("/api/queries/:id", (req, res) => {
    const { id } = req.params;
    res.json(getQueryByRequestId(id));
  });
  router.use("/{*splat}", (_, res) => {
    res.sendFile(path.join(uiPath, "index.html"));
  });
  return router;
}
function lens(options = {}) {
  const path2 = options.path || "/lens";
  const router = express.Router();
  router.get("/lens-config", (_, res) => {
    res.json({ path: path2 });
  });
  router.use(path2, routes());
  router.use(middleware);
  return router;
}
export {
  createProxy,
  getRequestId,
  lens
};