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/** For testing asynchronous json downloading, here we have a tiny http server.
*
* For every request (regardless f path) it responds with the json [0,1,2,3,4,5,6,7,8,9]
* but writing out each number one at a time.
*
* You can start this server up and visit it in a browser to see the numbers stream in.
*/
require('color');
function startServer( port, grunt ) {
"use strict";
var JSON_MIME_TYPE = "application/octet-stream";
var verboseLog = grunt? grunt.verbose.ok : console.log,
errorLog = grunt? grunt.log.error : console.error;
function echoBackBody(req, res) {
req.pipe(res);
}
function echoBackHeadersAsBodyJson(req, res) {
res.end(JSON.stringify(req.headers));
}
function echoBackHeadersAsHeaders(req, res) {
for( var name in req.headers ) {
res.set(name, req.headers[name]);
}
res.end('{"see":"headers", "for":"content"}');
}
function replyWithTenSlowNumbers(_req, res) {
sendJsonOkHeaders(res);
var NUMBER_INTERVAL = 250;
var MAX_NUMBER = 9;
verboseLog(
'slow number server: will write numbers 0 ..' +
String(MAX_NUMBER).blue +
' out as a json array at a rate of one per',
String(NUMBER_INTERVAL).blue + 'ms'
);
res.write('[\n');
var curNumber = 0;
var inervalId = setInterval(function () {
res.write(String(curNumber));
if (curNumber == MAX_NUMBER) {
res.end(']');
clearInterval(inervalId);
verboseLog('slow number server: finished writing out');
} else {
res.write(',\n');
curNumber++;
}
}, NUMBER_INTERVAL);
}
function replyWithInvalidJson(req, res) {
res.end('{{');
}
function serve404Json(req, res) {
// our little REST endpoint with errors:
res.status(404).send(JSON.stringify(
{
"found":"false",
"errorMessage":"was not found"
}
));
}
function replyWithStaticJson(req, res) {
sendJsonOkHeaders(res);
if( !req.url ) {
throw new Error('no url given');
}
var filename = 'test/json/' + req.params.name + '.json';
verboseLog('will respond with contents of file ' + filename);
require('fs').createReadStream(filename)
.on('error', function(err){
errorLog('could not read static file ' + filename +
' ' + err);
}).pipe(res);
}
function sendJsonOkHeaders(res) {
res.setHeader("Content-Type", JSON_MIME_TYPE);
res.writeHead(200);
}
function twoHundredItems(_req, res) {
var TIME_BETWEEN_RECORDS = 40;
// 80 records but only every other one has a URL:
var NUMBER_OF_RECORDS = 200;
res.write('{"data": [');
var i = 0;
var inervalId = setInterval(function () {
res.write(JSON.stringify({
"id": i,
"url": "http://localhost:4444/item/" + i,
// let's get some entropy in here for gzip:
"number1": Math.random(),
"number2": Math.random(),
"number3": Math.random(),
"number4": Math.random()
}));
if (i == NUMBER_OF_RECORDS) {
res.end(']}');
clearInterval(inervalId);
console.log('db server: finished writing to stream');
} else {
res.write(',');
}
i++;
}, TIME_BETWEEN_RECORDS);
}
function replyWithTenSlowNumbersGzipped(req, serverResponse){
// request out non-gzipped stream and re-serve gzipped
require('http').get({
host: 'localhost',
path: '/twoHundredItems',
port: port })
.on('response', function(clientResponse){
var zlib = require('zlib');
//res.writeHead(200, { 'content-encoding': 'gzip' });
serverResponse.setHeader("content-type", JSON_MIME_TYPE);
serverResponse.setHeader("content-encoding", 'gzip');
serverResponse.writeHead(200);
clientResponse.pipe(zlib.createGzip({
flush: zlib.Z_SYNC_FLUSH
})).pipe(serverResponse);
});
}
function makeApp() {
var express = require('express'),
app = express();
app.get( '/echoBackBody', function(req, res){ res.end("POST/PUT/PATCH here, don't GET")});
app.post( '/echoBackBody', echoBackBody);
app.put( '/echoBackBody', echoBackBody);
app.patch( '/echoBackBody', echoBackBody);
app.get( '/echoBackHeadersAsBodyJson', echoBackHeadersAsBodyJson);
app.post( '/echoBackHeadersAsBodyJson', echoBackHeadersAsBodyJson);
app.put( '/echoBackHeadersAsBodyJson', echoBackHeadersAsBodyJson);
app.patch( '/echoBackHeadersAsBodyJson', echoBackHeadersAsBodyJson);
app.get( '/echoBackHeadersAsHeaders', echoBackHeadersAsHeaders);
app.get( '/static/json/:name.json', replyWithStaticJson);
app.get( '/tenSlowNumbers', replyWithTenSlowNumbers);
app.get( '/twoHundredItems', twoHundredItems);
app.get( '/gzippedTwoHundredItems', replyWithTenSlowNumbersGzipped);
app.get( '/invalidJson', replyWithInvalidJson);
app.get( '/404json', serve404Json);
return app;
}
makeApp().listen(port);
verboseLog('streaming source server started on port'.green, String(port).blue);
}
function exportApi(){
var server;
module.exports.start = function(port, grunt){
server = startServer(port, grunt);
};
module.exports.stop = function(){
server.close();
};
}
exportApi();
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