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ratings.js
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ratings.js
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// Copyright 2017 Istio Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
var http = require('http');
var dispatcher = require('httpdispatcher');
var mysql = require('mysql');
port = parseInt(process.argv[2]);
var hostName = process.env.MYSQL_DB_HOST;
var portNumber = process.env.MYSQL_DB_PORT;
var username = process.env.MYSQL_DB_USER;
var password = process.env.MYSQL_DB_PASSWORD;
var first_rating = 0;
var second_rating = 0;
var third_rating = 0;
var fourth_rating = 0;
var fifth_rating = 0;
var ratingsResponse;
dispatcher.onGet("/", function(req, res) {
res.writeHead(200)
res.end(
'<html>' +
'<head>' +
'<meta charset="utf-8">' +
'<meta http-equiv="X-UA-Compatible" content="IE=edge">' +
'<meta name="viewport" content="width=device-width, initial-scale=1">' +
'<!-- Latest compiled and minified CSS -->' +
'<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">' +
'<!-- Optional theme -->' +
'<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap-theme.min.css">' +
'<!-- Latest compiled and minified JavaScript -->' +
'<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>' +
'<!-- Latest compiled and minified JavaScript -->' +
'<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>' +
'</head>' +
'<title>Book ratings service</title>' +
'<body>' +
'<p><h2>Hello! This is the book ratings service. My content is</h2></p>' +
'<div>' + JSON.stringify(ratingsResponse) + '</div>' +
'</body>' +
'</html>',
{"Content-type": "text/html"})
})
dispatcher.onGet("/ratings", function(req, res) {
var connection = mysql.createConnection({
host: hostName,
port: portNumber,
user: username,
password: password,
database : 'bookinfo_db'
});
var json;
connection.connect();
connection.query('SELECT Rating FROM reviews WHERE BookID=1', function (error, results, fields) {
if (error) throw error;
if (results[0]) {
first_rating = results[0].Rating;
}
console.log(first_rating);
if (results[1]) {
second_rating = results[1].Rating;
}
console.log(second_rating);
if (results[2]) {
third_rating = results[2].Rating;
}
console.log(third_rating);
if (results[3]) {
fourth_rating = results[3].Rating;
}
console.log(fourth_rating);
if (results[4]) {
fifth_rating = results[4].Rating;
}
console.log(fifth_rating);
ratingsResponse = {"Reviewer1": first_rating, "Reviewer2": second_rating, "Reviewer3": third_rating, "Reviewer4": fourth_rating, "Reviewer5": fifth_rating};
console.log(ratingsResponse);
json = JSON.stringify(ratingsResponse)
res.writeHead(200, {"Content-type": "application/json"})
res.end(json)
});
connection.end();
})
dispatcher.onGet("/health", function(req, res) {
res.writeHead(200, {"Content-type": "text/plain"})
res.end("Ratings is healthy")
})
function handleRequest(request, response){
try {
console.log(request.method + " " + request.url);
dispatcher.dispatch(request, response);
} catch(err) {
console.log(err);
}
}
var server = http.createServer(handleRequest);
server.listen(port, function(){
console.log("Server listening on: http://0.0.0.0:%s", port);
});