111 lines
2.5 KiB
JavaScript
111 lines
2.5 KiB
JavaScript
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// server.js
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// import express ()
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var express = require('express'); // npm install --save express
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var app = express();
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// import node.js http
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var server = require('http').Server(app);
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// import socket.io
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var io = require('socket.io')(server); // npm install --save socket.io
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// import filesystem (aka fs)
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var fs = require('fs');
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//import twitter
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var twitter = require('twitter'); // npm install --save twitter
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/* ----------------------
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Twitter Configuration
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-------------------------*/
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// load configuration file with all secrets, etc.
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var config_file = "./twitter_credentials.json";
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var config = JSON.parse(fs.readFileSync(config_file, "utf8"));
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// create the twitter client
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var client = new twitter(config);
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/*------------------------
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TWITTER FUNCTIONS
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--------------------------*/
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function search_twitter(keyword_value, nbr_hits) {
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//var twitter_search_params = {q: keyword_value, geocode: "37.781157,-122.398720,100mi"}; // <-- this is centered around a given region
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var twitter_search_params = {q: keyword_value, count: nbr_hits};
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client.get('search/tweets', twitter_search_params, function(error, tweets, response) {
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var results = [];
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//console.log(tweets);
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if(!error) {
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for(tweet of tweets.statuses) {
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if(tweet.user.location != null && tweet.user.location.trim().length > 0) {
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//console.log('-->' + tweet.user.location + '<--');
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results.push({tweet_text: tweet.text, location: tweet.user.location});
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}
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}
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} else {
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console.log('* ERROR *: ' + error);
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}
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// send results to client
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io.emit('search_twitter_results', results);
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});
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}
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/* ----------------------------------
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Server and Socket Configuration
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--------------------------------------*/
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// tell express to server our index.html file
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app.get('/', function (req, res) {
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res.sendFile(__dirname + '/index.html');
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});
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// configure socket.io
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// (1) when there is a connection
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io.on('connection', function(socket) {
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console.log('got a connection');
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// (2) configure the connected socket to receive custom messages ('message from human')
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socket.on('search_twitter', function(msg) {
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console.log('searching twitter with: ' + msg.toString());
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search_twitter(msg.keyword_value, msg.nbr_hits);
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});
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socket.on('disconnet', function() {
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console.log('got a disconnection');
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});
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});
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/* -------------------
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Start the server
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----------------------*/
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// listen to connection on port 8088 --> http://localhost:8088
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server.listen(8088, function () {
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console.log('listening on port: ' + 8088);
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});
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