fix(logging): Adding logging for analytics

src/app.js

@@ -22,6 +22,9 @@ const cors = require('cors')
 const AuthMW = require('./middleware/auth')
 const jwtAuth = require('./middleware/jwt-auth')
 
+// Logging for API requests.
+const logReqInfo = require('./middleware/req-logging')
+
 // v3
 const healthCheckV3 = require('./routes/v3/health-check')
 const BlockchainV3 = require('./routes/v3/full-node/blockchain')
@@ -82,6 +85,9 @@ app.use(bodyParser.urlencoded({ extended: false }))
 app.use(cookieParser())
 app.use(express.static(path.join(__dirname, 'public')))
 
+// Log requests for later analysis.
+app.use('/', logReqInfo)
+
 // const v2prefix = "v2"
 const v3prefix = 'v3'
 

src/middleware/req-logging.js

@@ -0,0 +1,52 @@
+/*
+  This middleware logs connection information to local logs. It gives the ability
+  to detect when the server is being DDOS attacked, and also to collect metrics,
+  like the most popular endpoints.
+*/
+
+// const express = require('express')
+const wlogger = require('../util/winston-logging')
+
+// Used for debugging and iterrogating JS objects.
+const util = require('util')
+util.inspect.defaultOptions = { depth: 1 }
+
+const logReqInfo = function (req, res, next) {
+  try {
+    /*
+    // console.log(`req: ${util.inspect(req)}`)
+    console.log(`req.headers: ${util.inspect(req.headers)}`)
+    console.log(`req.url: ${req.url}`)
+    console.log(`req.method: ${req.method}`)
+    // console.log(`req.sws.ip: ${req.sws.ip}`)
+    // console.log(`req.sws.real_ip: ${req.sws.real_ip}`)
+    console.log(`req.body: ${util.inspect(req.body)}`)
+    console.log(`req.connection.remoteAddress: ${util.inspect(req.connection.remoteAddress)}`)
+    // console.log(`req: `, req)
+    console.log(` `)
+    console.log(` `)
+    */
+
+    // const ip = req.sws.real_ip
+    const ip = req.header('x-forwarded-for') || req.connection.remoteAddress
+    const method = req.method
+    const url = req.url
+
+    const dataToLog = {
+      headers: req.headers,
+      url: url,
+      method: method,
+      ip: ip,
+      body: req.body
+    }
+
+    wlogger.verbose(`Request: ${ip} ${method} ${url}`, dataToLog)
+
+    next()
+  } catch (err) {
+    console.error('Error in req-logging.js middleware: ', err)
+    next()
+  }
+}
+
+module.exports = logReqInfo