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index.js
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const express = require("express");
const Graph = require("graph-data-structure");
const bodyParser = require('body-parser');
const Queues = require("Queue");
const vis = require("vis");
const Queue = Queues.Queue;
const app = express();
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());
app.use(bodyParser.raw());
app.use(function(req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
next();
});
class Stack {
constructor(){
this.data = [];
this.top = 0;
}
push(element) {
this.data[this.top] = element;
this.top = this.top + 1;
}
length() {
return this.top;
}
peek() {
return this.data[this.top-1];
}
isEmpty() {
return this.top === 0;
}
pop() {
if( this.isEmpty() === false ) {
this.top = this.top -1;
return this.data.pop(); // removes the last element
}
}
print() {
var top = this.top - 1; // because top points to index where new element to be inserted
while(top >= 0) { // print upto 0th index
console.log(this.data[top]);
top--;
}
}
reverse() {
this._reverse(this.top - 1 );
}
_reverse(index) {
if(index != 0) {
this._reverse(index-1);
}
console.log(this.data[index]);
}
}
// Helper functions
/*
return structure :
[
{ node : value , node: value .....},
{ node : value , node : value ....}
]
value = 0 => never visted
value = 1 => currently present
value = 2 => visited but nowignored
*/
function dfs_utils (serilaize,graph,visited,a,num,temp,list)
{
visited[a] = num;
temp.push(a);
//console.log(temp)
list[list.length] = JSON.stringify(temp);
num +=1;
for (let j = 0; j < serilaize["links"].length; ++j)
{
if (serilaize["links"][j]["source"] == a)
if (visited[serilaize["links"][j]["target"]] == 0)
{
dfs_utils(serilaize,graph,visited,serilaize["links"][j]["target"],num,temp,list);
}
}
temp.pop();
}
function dfs (graph,src,dst)
{
var serilaize = graph.serialize();
//console.log(serilaize);
var visited = new Object();
for (let i = 0; i < serilaize["nodes"].length; ++i)
{
visited[serilaize["nodes"][i]["id"]] = 0;
}
var temp = [];
var list = [];
dfs_utils(serilaize,graph,visited,src,1,temp,list);
for (let i =0; i < list.length; ++i)
{
console.log(list[i]);
}
return [visited,list];
}
function bfs (graph,src,dst)
{
var serilaize = graph.serialize();
var num = 1;
var visited = new Object();
for (let i = 0; i < serilaize["nodes"].length; ++i)
{
visited[serilaize["nodes"][i]["id"]] = 0;
}
var queue = new Queue();
queue.enqueue(src);
visited[src] = num;
num += 1;
while(!queue.isEmpty())
{
let s = queue.front();
//console.log("HEllo",s)
queue.dequeue();
for (let j = 0; j < serilaize["links"].length; ++j)
{
if (serilaize["links"][j]["source"] == s)
if (visited[serilaize["links"][j]["target"]] == 0)
{
visited[serilaize["links"][j]["target"]] = num;
num += 1;
queue.enqueue(serilaize["links"][j]["target"]);
}
}
}
//console.log(visited);
return visited
}
function greedy (graph,huri,src,dst)
{
var serilaize = graph.serialize();
var num = 1;
var visited = new Object();
for (let i = 0; i < serilaize["nodes"].length; ++i)
{
visited[serilaize["nodes"][i]["id"]] = 0;
}
console.log(serilaize);
console.log(huri,src,dst);
var queue = new Queue();
queue.enqueue({src:huri[src]});
console.log(queue);
}
/*
/api/v1/test
*/
app.post('/api/v1/test', (req,res) => {
console.log("All modules Loaded");
res.status(200).send({"Status" : "Online"});
});
/*
/api/v1/dijkstra
input : {
"nodes" : ["a", "b", "c" ....],
"weights" : [1,2],
"edges": [["a","b"],.....],
"src" :
"dst":
}
*/
app.post('/api/v1/dijkstra', (req,res) => {
console.log("Dijkstra");
//console.log(req.body)
if (req.body["edges"].length != req.body["weights"].length || req.body["symetric"] == 1)
{
res.status(404).send("Bad Request (Wrong Size/ Non Symetric)");
}
else
{
var graph = Graph();
for (let i = 0; i < req.body["nodes"].length; ++i)
{
graph.addNode(req.body["nodes"][i]);
}
for (let i = 0; i < req.body["edges"].length; ++i)
{
graph.addEdge(req.body["edges"][i][0],req.body["edges"][i][1],req.body["weights"][i]);
}
var serilaize = graph.serialize();
try {
var result = graph.shortestPath(req.body["src"],req.body["dst"]);
//console.log(serilaize);
var out = {}
var num = 1;
out["Result"] = "Yes"
for (let i = 0; i < result.length; ++i)
{
out[result[i]] = num;
num += 1;
}
console.log(JSON.stringify(out));
res.status(200).send(JSON.stringify(out));
}
catch(err) {
var out = {
"Result" : "No"
}
console.log(out);
res.status(204).send(JSON.stringify(out));
}
}
});
/*
/api/v1/dfs
input : {
"nodes" : ["a", "b", "c" ....],
"weights" : [1,2],
"edges": [["a","b"],.....],
"src" :
"dst":
}
*/
app.post('/api/v1/dfs', (req,res) => {
console.log("DFS");
if (req.body["edges"].length != req.body["weights"].length || req.body["symetric"] == 1)
{https://www.w3schools.com/js/js_arrays.asp
res.status(404).send("Bad Request (Wrong Size/ Non Symetric)");
}
else
{
var graph = Graph();
for (let i = 0; i < req.body["nodes"].length; ++i)
{
graph.addNode(req.body["nodes"][i]);
}
for (let i = 0; i < req.body["edges"].length; ++i)
{
graph.addEdge(req.body["edges"][i][0],req.body["edges"][i][1],req.body["weights"][i]);
}
var ret;
var list;
var visited;
ret= dfs(graph,req.body["src"],req.body["dst"]);
list = ret[1];
visited = ret[0];
for (let i =0; i < list.length; ++i)
{
console.log('Inside',list[i]);
}
//console.log(visited,visited[req.body["dst"]]);
if (visited[req.body["dst"]] == undefined)
{
visited["Result"] = "No";
visited["Graph"] = list;
res.status(200).send(JSON.stringify(visited));
}
else if (visited[req.body["dst"]] != 0 )
{
visited["Result"] = "Yes";
visited["Graph"] = list;
console.log(list);
res.status(200).send(JSON.stringify(visited));
}
else
{
visited["Result"] = "No";
visited["Graph"] = list;
res.status(200).send(JSON.stringify(visited));
}
}
});
/*
/api/v1/bfs
input : {
"nodes" : ["a", "b", "c" ....],
"weights" : [1,2],
"edges": [["a","b"],.....],
"src" :
"dst":
}
*/
app.post('/api/v1/bfs', (req,res) => {
console.log("BFS");
if (req.body["edges"].length != req.body["weights"].length || req.body["symetric"] == 1)
{
res.status(404).send("Bad Request (Wrong Size/ Non Symetric)");
}
else
{
var graph = Graph();
for (let i = 0; i < req.body["nodes"].length; ++i)
{
graph.addNode(req.body["nodes"][i]);
}
for (let i = 0; i < req.body["edges"].length; ++i)
{
graph.addEdge(req.body["edges"][i][0],req.body["edges"][i][1],req.body["weights"][i]);
}
var visited = bfs(graph,req.body["src"],req.body["dst"]);
//console.log(visited,visited[req.body["dst"]]);
if (visited[req.body["dst"]] == undefined)
{
res.status(200).send("Node not found");
}
else if (visited[req.body["dst"]] != 0 )
{
res.status(200).send(JSON.stringify(visited));
}
else
{
res.status(200).send("No path found");
}
}
});
/*
/api/v1/astar
input : {
"nodes" : ["a", "b", "c" ....],
"weights" : [1,2], // heurustic
"edges": [["a","b"],.....],
"src" :
"dst":
}
*/
app.post('/api/v1/astar', (req,res) => {
console.log("A *");
if (req.body["edges"].length != req.body["weights"].length || req.body["symetric"] == 1 || req.body["nodes"].length != req.body["heuri"].length)
{
res.status(404).send("Bad Request (Wrong Size/ Non Symetric)");
}
else
{
var graph = Graph();
var nodes = new Object();
for (let i = 0; i < req.body["nodes"].length; ++i)
{
graph.addNode(req.body["nodes"][i]);
nodes[req.body["nodes"][i]] = req.body["heuri"][i]
}
for (let i = 0; i < req.body["edges"].length; ++i)
{
graph.addEdge(req.body["edges"][i][0],req.body["edges"][i][1],req.body["weights"][i]);
}
var serilaize = graph.serialize();
console.log(serilaize);
console.log(graph);
console.log(nodes);
/* A start algo goes here */
var openList = []
var closeList = []
openList.push(nodes[req.body["src"]]);
while (! openList.isEmpty())
{
min = Math.min(...openList);
}
res.status(404).send("Nibbas");
}
//res.status(404).send("Nibbas");
});
app.post('/api/v1/greedySearch', (req,res) => {
console.log("Greedy");
if (req.body["edges"].length != req.body["weights"].length || req.body["symetric"] == 1 || req.body["nodes"].length != req.body["huri"].length)
{
res.status(404).send("Bad Request (Wrong Size/ Non Symetric)");
}
else
{
var graph = Graph();
var nodes = new Object();
for (let i = 0; i < req.body["nodes"].length; ++i)
{
graph.addNode(req.body["nodes"][i]);
nodes[req.body["nodes"][i]] = req.body["huri"][i]
}
for (let i = 0; i < req.body["edges"].length; ++i)
{
graph.addEdge(req.body["edges"][i][0],req.body["edges"][i][1],req.body["weights"][i]);
}
var serilaize = graph.serialize();
//console.log(serilaize);
//console.log(graph);
//console.log(nodes);
/* Greedy */
greedy(graph,nodes,req.body["src"],req.body["dst"]);
res.status(404).send("Nibbas");
}
});
const port = process.env.PORT || 8080; //node is gay
app.listen(port, () => {
console.log("started on ",port);
});