Use separate modules, get config from env

modules/ServerUtils.js

@@ -0,0 +1,19 @@
+import cors from 'cors'
+import express from 'express'
+import { createRequestHandler } from 'npm-http-server'
+import { logStats } from './StatsUtils'
+
+export const createServer = (options = {}) => {
+  const app = express()
+
+  app.disable('x-powered-by')
+  app.use(cors())
+  app.use(express.static('public', { maxAge: 60000 }))
+
+  if (options.redisURL)
+    app.use(logStats(options.redisURL))
+
+  app.use(createRequestHandler(options))
+
+  return app
+}

modules/StatsUtils.js

@@ -0,0 +1,27 @@
+import redis from 'redis'
+import onFinished from 'on-finished'
+
+const URLFormat = /^\/((?:@[^\/@]+\/)?[^\/@]+)(?:@([^\/]+))?(\/.*)?$/
+
+export const logStats = (redisURL) => {
+  const redisClient = redis.createClient(redisURL)
+
+  return (req, res, next) => {
+    onFinished(res, () => {
+      const path = req.path
+
+      if (res.statusCode === 200 && path.charAt(path.length - 1) !== '/') {
+        redisClient.zincrby([ 'request-paths', 1, path ])
+
+        const match = URLFormat.exec(path)
+
+        if (match) {
+          const packageName = match[1]
+          redisClient.zincrby([ 'package-requests', 1, packageName ])
+        }
+      }
+    })
+
+    next()
+  }
+}