Radium: BackendChallenge

.gitignore

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+node_modules

Startup Guide.txt

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+Steps to use:-
+
+1. Give the following commands:-
+
+  - npm install-  To install all the dependencies
+  - npm start-  To start the server
+
+2. The server is built on NodeJS so it needs to be installed to run this application.
+
+2. Following end points have been made:-
+    - /stats :-
+           - This end point gives all the stats about the requests made.
+           - It uses GET method to get all the data statistics.
+
+    - /process :-
+
+          - This end point uses GET,POST,PUT and DELETE methods.
+          - GET : This method responds with a json containing all requests made since server startup.
+                It also creates its own get request containing all the specified json data.
+          - POST : This method posts a request to the server with the specified json attributes with each request containing its own id.
+
+    - /process/id :-
+          - GET : This method serves the json response for that id request.
+          - PUT : This method updates the requested id document with the content specified in body with x-wwww-form-urlencoded key value pairs if they are present in the json object.
+          - DELETE : This request deletes the requested object based on its id.
+
+      /stats :-
+            - GET : This method gives all the statistics related to the requests made till the server startup as mentioned in the challenge.
+
+  3. A time delay of 1 second has been given to all the requests which can be changed as per requirements.           

package.json

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+{
+  "name": "app",
+  "version": "1.0.0",
+  "description": "Create a web server with two endpoints:",
+  "main": "server.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "nodemon server.js"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/backbench/BackendChallenge.git"
+  },
+  "author": "",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/backbench/BackendChallenge/issues"
+  },
+  "homepage": "https://github.com/backbench/BackendChallenge#readme",
+  "dependencies": {
+    "body-parser": "^1.17.2",
+    "express": "^4.15.3",
+    "path": "^0.12.7"
+  }
+}

router/router.js

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+module.exports=function(express,app){
+   var router=express.Router(),
+   path=require('path');
+
+var list=[];
+var get="GET",post="POST",put="PUT",del="DELETE",id=0;
+
+getData=(req,res,date)=>{
+
+  var data={
+    "id":id++,
+    "time":date.getHours()+":"+date.getMinutes()+":"+date.getSeconds(),
+    "method":req.method,
+    "path":req.path,
+    "query":req.query,
+    "body":req.body,
+    "headers":req.headers,
+    "duration":0
+  };
+  return data;
+}
+
+responseTimeoutList=(req,res,data,startTime)=>{
+  setTimeout(()=>{
+    data.duration=Math.abs(new Date().getSeconds()-startTime)%60;
+    list.push(data);
+    res.json(list);
+  },1000)
+}
+
+responseTimeoutData=(req,res,data,startTime)=>{
+  setTimeout(()=>{
+    data.duration=Math.abs(new Date().getSeconds()-startTime)%60;
+    list.push(data);
+    res.json(data);
+  },1000)
+}
+
+
+filterListOnMethod=(method)=>{
+  var getList=list.filter(l=>{
+    return l.method==method
+  })
+  return getList;
+}
+
+no_Of_requests=(method)=>{
+  var getList=filterListOnMethod(method);
+  return getList.length;
+}
+
+getFromTime=(time,index)=>{
+  var timeList=time.split(":");
+  return parseInt(timeList[index]);
+}
+
+
+getFilteredList=(method)=>{
+  var getList=filterListOnMethod(method);
+  if(getList.length==0)return null;
+  return getList;
+}
+
+getSumList=(filterList)=>{
+  if(filterList.length==0)return -1;
+  var sumList=filterList.map(l=>{
+    return l.duration;
+  });
+  var sum =sumList.reduce((a,b)=>{
+    return a+b;
+  });
+  sum/=sumList.length;
+  return sum;
+}
+
+getAvgResTimePastHour=(method)=>{
+  var getList=getFilteredList(method);
+  if(getList==null)return -1;
+  var filterList=getList.filter(l=>{
+    var currHour=new Date().getHours();
+    var prevHour=getFromTime(l.time,0);
+    var requestHour=Math.abs(currHour-prevHour);
+    if(requestHour<1)return l;
+  });
+
+  return getSumList(filterList);
+}
+
+getAvgResTimePastMin=(method)=>{
+  var getList=getFilteredList(method);
+  if(getList==null)return -1;
+  var filterList=getList.filter(l=>{
+    var currMin=new Date().getMinutes();
+    var prevMin=getFromTime(l.time,1);
+    var requestMin=Math.abs(currMin-prevMin);
+    if(requestMin<1)return l;
+  });
+
+  return getSumList(filterList);
+}
+
+router.get('/',(req,res,next)=>{
+  res.send('Welcome to the application: Try the following end points- /process , /stats');
+})
+
+router.get('/process',(req,res,next)=>{
+  var date=new Date();
+  var startTime=date.getSeconds();
+  var data=getData(req,res,date);
+  responseTimeoutList(req,res,data,startTime);
+})
+
+router.get('/process/:id',(req,res,next)=>{
+  var date=new Date();
+  var startTime=date.getSeconds();
+  list.push(getData(req,res,date));
+  var data=list.filter(l=>{
+    if(l.id==req.params.id)return l;
+  })
+  if(data==null || data.length==0)res.send('No such data for this id');
+  else res.json(data);
+})
+
+router.post('/process',(req,res,next)=>{
+  var date=new Date();
+  var startTime=date.getSeconds();
+  var data=getData(req,res,date);
+  responseTimeoutData(req,res,data,startTime);
+})
+router.put('/process/:id',(req,res,next)=>{
+  var date=new Date();
+  var startTime=date.getSeconds();
+  list=list.filter(l=>{
+    if(l.id==req.params.id){
+      if(req.body.id)l.id=parseInt(req.body.id);
+      if(req.body.time)l.time=req.body.time;
+      if(req.body.method)l.method=req.body.method;
+      if(req.body.path)l.path=req.body.path;
+      if(req.body.query)l.query=req.body.query;
+      if(req.body.duration)l.duration=req.body.duration;
+    }
+    return l;
+  });
+  var idList=list.filter(l=>{
+    if(l.id==req.params.id)return l;
+  });
+  var data=getData(req,res,date);
+  responseTimeoutList(req,res,data,startTime);
+})
+router.delete('/process/:id',(req,res,next)=>{
+  var date=new Date();
+  var startTime=date.getSeconds();
+  list=list.filter(l=>{
+    if(l.id!=req.params.id)return l;
+  });
+  var data=getData(req,res,date);
+  responseTimeoutList(req,res,data,startTime);
+})
+
+router.get('/stats',(req,res,next)=>{
+
+if(list==null || list.length==0)res.send('Sorry no stats available you need to make post request first');
+
+var statData={
+  "total requests":list.length,
+  "No of GET requests":no_Of_requests(get),
+  "No of POST requests":no_Of_requests(post),
+  "No of PUT requests":no_Of_requests(put),
+  "No of DELETE requests":no_Of_requests(del),
+  "Avg response time of Get request past hour":getAvgResTimePastHour(get),
+  "Avg response time of Post request past hour":getAvgResTimePastHour(post),
+  "Avg response time of Put request past hour":getAvgResTimePastHour(put),
+  "Avg response time of Delete request past hour":getAvgResTimePastHour(del),
+  "Avg response time of Get request past minute":getAvgResTimePastMin(get),
+  "Avg response time of Post request past minute":getAvgResTimePastMin(post),
+  "Avg response time of Put request past minute":getAvgResTimePastMin(put),
+  "Avg response time of Delete request past minute":getAvgResTimePastMin(del)
+}
+
+res.json(statData);
+})
+
+app.use('/',router);
+}

server.js

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+var express=require('express');
+var path=require('path');
+var app=express();
+var bodyParser=require('body-parser');
+
+app.use(bodyParser.urlencoded({extended:true}));
+app.use(bodyParser.json());
+
+require('./router/router.js')(express,app);
+
+app.listen(3000,(err)=>{
+  console.log('Server running on port 3000');
+})
+
+
+// Kindly refer the Startup Guide.txt for details of this project