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server.node.js
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server.node.js
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// node.js
/*
*/
/*
testing:
*/
// connect to db,
var dijkstra = require("./js/dijkstra.js").dijkstra();
var poiPath = require("./js/poiPath.js").poiPath();
dijkstra.graph_file = "data/all_floors.json";
poiPath.graph_file = "./data/all_floors.json";
var async = require("async");
var urlparser = require("url");
var fs = require("fs");
var pathparser = require("path");
var dataFilename = "all_floors.json";
var dataDir = "data/";
var dataGraphs = {};
var graphGalleryNodes = {};
var jsdom = require("jsdom");
$ = require("jquery")(jsdom.jsdom().createWindow());
var port = 1337;
if(process && process.env && process.env.NODE_ENV == "production"){
port = 1337;
}
// create some sample objects, put in couchdb
startServer();
var started = false;
function startServer(){
if(!started){
started = true;
}else{
console.log("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! already started!");
return;
}
var http = require('http');
http.createServer(function (req, res) {
parseRequest(req, res);
}).listen(port);
console.log('Server running at port ' + port);
}
function parseRequest(req, res){
res.setHeader("Access-Control-Allow-Headers", req.headers["access-control-request-headers"]);
console.log("got request");
var parsed = urlparser.parse(req.url, true)
var query = urlparser.parse(req.url, true).query;
console.log('~~~~~~~~~~~~~~~~~');
// console.log(parsed);
console.log('~~~~~~~~~~~~~~~~~');
//console.log(query);
console.log('~~~~~~~~~~~~~~~~~');
if(!query.action){
sendFile(parsed.pathname, query, res);
}else if (query.action == "poiPath"){
console.log("calling poiPath");
poi_set = JSON.parse(query.poi);
loadGraphIntoMemory(dataFilename, function(){
reconcile_pois(dataFilename, poi_set, function(_poi_set, poi_problems){
poiPath.poiPathCalc(_poi_set, query.prefs, function(poiPath_received){
console.log("poiPathCalc is running on the server");
//console.log(poiPath_received);
console.log(req.headers);
res.setHeader("Access-Control-Allow-Headers", req.headers["access-control-request-headers"]);
res.writeHead(200, {'Content-Type': 'application/json',
'Access-Control-Allow-Origin' : '*'});
res.end(JSON.stringify({poiPath: poiPath_received , poi_problems: poi_problems}));
});
});
}, false);
}else if (query.action == "dijkstra"){
console.log("calling DijkstraCalc");
//console.log(dijkstra);
dijkstra.dijkstraCalc(query.c1, query.c2, function(nodes, edges){
console.log("got nodes and edges");
res.writeHead(200, {'Content-Type': 'application/json',
'Access-Control-Allow-Origin' : '*'});
res.end(JSON.stringify({nodes: nodes, edges: edges}));
});
}else if (query.action == "savegraph"){
saveGraph(req, res, query);
}else if (query.action == "loadgraph"){
loadGraph(req, res, query);
}else if (query.action == "getgraphlist"){
getGraphList(req, res, query);
}else if (query.action == "getgallerynode"){
getGalleryNode(req, res, query);
}else if(query.action == "search"){
searchScrapi(req, res, query);
}else{
res.writeHead(200, {'Content-Type': 'text/html',
'Access-Control-Allow-Origin' : '*'});
res.end("<html><body><pre>not sure what to do</pre></body></html>");
}
}
var limit = require("simple-rate-limiter");
var scrapi_request = limit(require('request')).to(10).per(1000);
function reconcile_pois(dataFilename, poi_set, callback){
// do a pass over teh submitted POIs. some might just be gallery numbers, or objects
var poi_problems = [];
var poi_count = 0;
var fix_poi_ids = function(poi_set){
var new_poi_set = {};
$.each(poi_set, function(index, poi){
if(poi.object_reconciled || poi.gallery_reconciled){
new_poi_set[poi.id] = poi;
}else{
new_poi_set[index] = poi;
}
});
return new_poi_set;
}
$.each(poi_set, function(index, poi){
console.log("checking " + index);
// if there's just an objectID, get the gallery, then the node data
if(!poi.x){ // ie, there's no coordinates
if(poi.objectinfo){
// scrapi call for objectinfo
var crdid = poi.objectinfo.id;
var url = "http://www.scrapi.org/object/"+crdid+"?fields=accessionNumber,title,dateText,gallery,CRDID,currentImage/imageUrl,medium,primaryArtistNameOnly";
console.log("Calling url " + url);
scrapi_request(url, function(error, response, body){
if (!error && response.statusCode == 200) {
console.log("got results"); // Show the HTML for the Google homepage.
var objectdata = JSON.parse(body);
objectdata.image_thumb = objectdata.currentImage.imageUrl.replace(/-large/, "-thumb");
objectdata.href= "http://www.scrapi.org/object/"+crdid;
objectdata.website_href= "http://www.metmuseum.org/collection/the-collection-online/search/"+crdid;
if(!objectdata.gallery.toString().match(/not on view/i)){
// poi.objectinfo = objectdata;
poi.galnum = objectdata.gallery;
reconcile_poi_galnum(dataFilename,poi, poi_problems);
}else{
var problem = {message: "the object " + crid + " isn't on view.", code: "obj_not_on_view", object: objectdata, poi: poi};
poi_problems.push(problem);
poi.problem = problem;
}
}else{
var problem = {message: "we couldn't find out where object " + crdid + " is.", code:"obj_search_error", poi: poi};
poi.problem = problem;
poi_problems.push(problem);
}
poi.object_reconciled = true;
poi_count++;
if(poi_count == Object.keys(poi_set).length){
console.log("all entries checked 2");
poi_set = fix_poi_ids(poi_set);
console.log(poi_set);
callback(poi_set, poi_problems);
}else{
console.log("count " + poi_count + " not to " + Object.keys(poi_set).length);
}
});
}else if (poi.galnum){ // if there's just a gallery number, get the node data from the graph
reconcile_poi_galnum(dataFilename, poi, poi_problems);
poi_count++;
if(poi_count == Object.keys(poi_set).length){
console.log("all entries checked 1");
console.log(poi_set);
poi_set = fix_poi_ids(poi_set);
callback(poi_set, poi_problems);
}else{
console.log("count " + poi_count + " not to " + Object.keys(poi_set).length);
}
}
}else{
// already has the data, but add an id attribute
poi.id = index;
poi.object_reconciled = true;
poi_count++;
if(poi_count == Object.keys(poi_set).length){
console.log("all entries checked 3");
console.log(poi_set);
poi_set = fix_poi_ids(poi_set);
callback(poi_set, poi_problems);
}else{
console.log("count " + poi_count + " not to " + Object.keys(poi_set).length);
}
}
});
}
function reconcile_poi_galnum(dataFilename, poi, poi_problems){
var galleryNode = graphGalleryNodes[dataFilename][poi.galnum];
if(!galleryNode){
var problem = {code: "gallery_not_listed", message : "we couldn't find gallery " + poi.galnum + " in the map", poi: poi};
poi.problem = problem;
poi_problems.push(problem);
}else{
$.extend(poi, galleryNode);
}
poi.gallery_reconciled = true;
}
function searchScrapi(req, res, query){
var term = query.term;
var scrapiurl = "http://scrapi.org/search/" +encodeURIComponent(term);
var request = require("request");
request(scrapiurl, function(error, response, body){
res.writeHead(response.statusCode, {"Content-Type" : response.headers['content-type'],
'Access-Control-Allow-Origin' : '*'});
res.end(body);
});
}
function loadGraphIntoMemory(graphName, callback, errorcallback){
dataFile = dataDir + graphName;
if(!fs.file)
fs.readFile(dataFile, function(err, data) {
if(err){
if(errorcallback){
errorcallback(err);
}
return;
}
console.log("data file");
console.log(data);
dataGraphs[graphName] = JSON.parse(data);
graphGalleryNodes[graphName] = {};
// create index of gallery nodes.
$.each(dataGraphs[graphName].nodes, function(index, node){
node.id = index;
if(node.galnum && node.galnum.trim() != ""){
graphGalleryNodes[graphName][node.galnum.trim()] = node;
}
});
if(callback){
callback();
}
});
}
//http://66.175.215.36/pathfinder/?action=getgallerynode&graphName=all_floors.json&gallerynumber=354
function getGalleryNode(req, res, query){
var graphName = query.graphName;
var galleryNumber = query.gallerynumber;
if(!graphGalleryNodes[graphName]){
loadGraphIntoMemory(graphName, function(){
var galleryNode = graphGalleryNodes[graphName][galleryNumber];
if(galleryNode){
var contentType = "application/json";
res.writeHead(200, {'Content-Type': contentType,
'Access-Control-Allow-Origin' : '*'});
res.end(JSON.stringify(galleryNode));
return;
}else{
var contentType = "application/json";
res.writeHead(200, {'Content-Type': contentType,
'Access-Control-Allow-Origin' : '*'});
res.end(JSON.stringify({result: "bad", message: "Gallery Number "+ galleryNumber+" not found " }));
return;
}
},
function(err){
var contentType = "application/json";
res.writeHead(200, {'Content-Type': contentType,
'Access-Control-Allow-Origin' : '*'});
res.end(JSON.stringify({result: "bad", message: "Gallery Number not found " + err}));
return;
});
}else{
var galleryNode = graphGalleryNodes[graphName][galleryNumber];
if(galleryNode){
var contentType = "application/json";
res.writeHead(200, {'Content-Type': contentType,
'Access-Control-Allow-Origin' : '*'});
res.end(JSON.stringify(galleryNode));
return;
}else{
var contentType = "application/json";
res.writeHead(200, {'Content-Type': contentType,
'Access-Control-Allow-Origin' : '*'});
res.end(JSON.stringify({result: "bad", message: "Gallery Number " + galleryNumber + " not found "}));
return;
}
}
}
function saveGraph(req, res, query){
//console.log(JSON.stringify(req));
/*
var graph = JSON.parse(query.graph);
var graphstring = JSON.stringify(graph, null, ' ');
*/
var body = '';
req.addListener('data', function(chunk){
console.log('got a chunk');
body += chunk;
});
req.addListener('error', function(error){
console.error('got a error', error);
next(err);
});
req.addListener('end', function(chunk){
console.log('ended');
if (chunk) {
body += chunk;
}
var data = JSON.parse(body);
var filename;
var dataFilename;
var shortname;
if(data.filename && data.filename.trim() != ""){
filename = data.filename;
if(!filename.match(/\.json$/)){
filename += ".json";
}
shortname = filename;
dataFilename = dataDir + filename;
}else{
var date = new Date();
var datetime = date.getTime();
shortname = "graph."+datetime+".json";
dataFilename = dataDir + shortname;
}
var graph = data.graph;
var graphstring = JSON.stringify(graph);
fs.writeFile(dataFilename, graphstring, function (err) {
if (err) {
var contentType = "application/json";
res.writeHead(200, {'Content-Type': contentType,
'Access-Control-Allow-Origin' : '*'});
res.end(JSON.stringify({result: "bad", message: err}));
return;
};
var contentType = "application/json";
res.writeHead(200, {'Content-Type': contentType,
'Access-Control-Allow-Origin' : '*'});
res.end(JSON.stringify({result: "good", filename: shortname}));
console.log('data saved to file ' + dataFilename);
});
});
}
function getGraphList(req, res, query){
console.log("getting graph list");
var filelist = getDataFileList(dataDir, function(list){
var contentType = "application/json";
res.writeHead(200, {'Content-Type': contentType,
'Access-Control-Allow-Origin' : '*'});
res.end(JSON.stringify(list));
});
}
function getDataFileList(dirname, callback2){
var filelist = fs.readdirSync(dirname);
var newList = {};
async.eachSeries(filelist,
function(file, callback){
newList[file] = {file: file};
var path = dirname + file;
newList[file].stat = fs.statSync(path);
callback();
},
function(){
callback2(newList);
}
);
}
function loadGraph(req, res, query){
console.log("loading");
console.log(query);
var dataFile = dataFilename;
if(query.dataFile){
dataFile = dataDir + query.dataFile;
}
fs.readFile(dataFile, function(err, data) {
if(err){
console.log(err);
var contentType = "application/json";
res.writeHead(200, {'Content-Type': contentType,
'Access-Control-Allow-Origin' : '*'});
res.end(JSON.stringify({result: "bad", message: err}));
return;
}
console.log("data file");
console.log(data);
var contentType = "application/json";
res.writeHead(200, {'Content-Type': contentType,
'Access-Control-Allow-Origin' : '*'});
res.end(data);
});
}
var dataCache = {};
function sendFile(path, query, res){
if(path == "/"){
path = "/index.html";
}
var extname = pathparser.extname(path);
var contentType = 'text/html';
switch (extname.toLowerCase()) {
case '.js':
contentType = 'text/javascript';
break;
case '.css':
contentType = 'text/css';
break;
case '.png':
contentType = 'image/png';
break;
case '.jpg':
contentType = 'image/jpeg';
break;
}
if(!dataCache[path]){
fs.readFile("."+path, function(err, data){
if(err){
console.log("file read error");
console.log(err);
res.writeHead(404, {'Content-Type': contentType,
'Access-Control-Allow-Origin' : '*'});
//indexhtml = data;
res.end(data);
}else{
res.writeHead(200, {'Content-Type': contentType,
'Access-Control-Allow-Origin' : '*'});
console.log("writing file " + path);
// console.log(data);
//dataCache[path] = data;
res.end(data);
}
});
}else{
res.writeHead(200, {'Content-Type': contentType,
'Access-Control-Allow-Origin' : '*'});
res.end(dataCache[path]);
}
}