path: root/src/nodejs/no1.js

var clutch = require('clutch');
var pg = require('pg');
var builder = require('xmlbuilder');

// load config
var config = require('./config.json');
process.argv.forEach(
    function (val,index, array){
        if(val=="-c"){
            path = array[index+1];
            if( path[0] != '/'){
                path = __dirname + '/' + path;
            }
            config = require(path);
        }
    });
var connectionString = config['connectionString'];

//set up logger
var log4js = require('log4js')(); //note the need to call the function
//log4js.addAppender(log4js.fileAppender('osm-xapi.log'), 'cheese');

var logger = log4js.getLogger('global');
logger.setLevel('ALL');

logger.info("server starting...");

function toISO8601(date) {
    //2007-03-31T00:09:22+01:00
    var pad_two = function(n) {
        return (n < 10 ? '0' : '') + n;
    };

    return [
        date.getUTCFullYear(),
        '-',
        pad_two(date.getUTCMonth() + 1),
        '-',
        pad_two(date.getUTCDate()),
        'T',
        pad_two(date.getUTCHours()),
        ':',
        pad_two(date.getUTCMinutes()),
        ':',
        pad_two(date.getUTCSeconds()),
        '+01:00'        //FIX ME
    ].join('');
}

function createWayBboxQuery(key, value, left, bottom, right, top) {
    return {
        text: 'SELECT id,tstamp,version,changeset_id,nodes,user_id,hstore_to_array(tags) as tags \
               FROM ways \
               WHERE ( \
                   tags @> hstore($1, $2) AND \
                   linestring && st_setsrid(st_makebox2d( \
                       st_setsrid(st_makepoint($3, $4), 4326), \
                       st_setsrid(st_makepoint($5, $6), 4326) \
                   ), 4326) \
               )',
        values: [key, value, left, bottom, right, top],
        name: 'way bbox query'
    };
}

function createNodeBboxQuery(key, value, left, bottom, right, top) {
    return {
        text: 'SELECT id,user_id,tstamp,version,changeset_id,hstore_to_array(tags) as tags, X(geom) as lat, Y(geom) as lon \
               FROM nodes \
               WHERE ( \
                   tags @> hstore($1, $2) AND \
                   geom && st_setsrid(st_makebox2d( \
                       st_setsrid(st_makepoint($3, $4), 4326), \
                       st_setsrid(st_makepoint($5, $6), 4326) \
                   ), 4326) \
               )',
        values: [key, value, left, bottom, right, top],
        name: 'node bbox query'
    };
}

function createNodesForWayQuery(nodes) {
    return {
        text: 'SELECT id,tstamp,version,changeset_id,hstore_to_array(tags) as tags, X(geom) as lat, Y(geom) as lon \
               FROM nodes \
               WHERE (id = ANY($1))',
        values: [nodes],
        name: 'nodes for way'
    };
}

function nodeWorldHandler(req, res, key, value) {
    res.writeHead(200, {'Content-Type': 'text/plain'});
    res.end(' key:' +key +' value:'+value+'\n');
}

function nodeBboxHandler(req, res, key, value, left, bottom, right, top) {
    console.log("nodeBboxHandler");
    db_connect(res, function(client) {
        console.log(createNodeBboxQuery(key, value, left, bottom, right, top));
        var success = false;
        var query = client.query(createNodeBboxQuery(key, value, left, bottom, right, top));

        query.on('error', function(err) {
            console.log(err);
            res.writeHead(404,{});
            res.end('\n');
        });

        query.on('end', function() {
            //console.log("end event\n");
            if(success) {
                res.write("</xml>");
                res.end();
            }
            else {
                //empty response
                res.writeHead(404,{});
                res.end();
                //perhaps write 404? is error also raised?
            }
        });

        query.on('row', function(row) {
            if(!success) {
                success = true;
                res.writeHead(200, {'Content-Type': 'text/plain'});
                res.write("<xml>");
            }

            console.log(row);

            var node = builder.begin('node')
                .att('id', row.id)
                .att('timetamp', toISO8601(row.tstamp))
                .att('version', row.version)
                .att('changeset', row.changeset_id)
                .att('lat', row.lat)
                .att('lon', row.lon);

            res.write(createXmlFromRow(row));
        });
    });
}

function createXmlFromRow(row) {
    console.log(row);
    var node = builder.begin('node')
        .att('id', row.id)
        .att('timetamp', toISO8601(row.tstamp))
        .att('version', row.version)
        .att('changeset', row.changeset_id)
        .att('lat', row.lat)
        .att('lon', row.lon);
    if(row.tags != '{}') {
        var temp = row.tags.replace("{","").replace("}","").split(",");
        for(var x=0;x<temp.length;x=x+2)
            node.ele('tag')
            .att('k',escape(temp[x]))
            .att('v',escape(temp[x+1]));
    }
    return builder.toString({ pretty: true });
}

function wayWorldHandler(req, res, key, value) {
    res.writeHead(200, {'Content-Type': 'text/plain'});
}

function connectionError(err, res) {
    console.log(err);
    console.log("foobar");
}

function db_connect(res, callback) {
    pg.connect(connectionString, function(err, client) {
        if(err) {
            console.log(err['message']);
            res.writeHead(404,{});
            res.end();
        } else {
            console.log("db connection was successfull");
            callback(client);
        }
    });
}

function wayBboxHandler(req, res, key, value, left, bottom, right, top) {
    db_connect(res, function(client) {
        var count = 0;
        var success = false;
        //console.log(createWayBboxQuery(key, value, left, bottom, right, top));
        var query = client.query(createWayBboxQuery(key, value, left, bottom, right, top));

        query.on('error', function(err) {
            console.log(err);
            res.writeHead(404,{});
            res.end();
        });

        query.on('end', function() {
            if(success) {
                if(count == 0) {
                    res.write("</xml>");
                    res.end();
                }
                //res.write("</xml>");
                //res.end();    //problem!!!
            }
            else {
                res.writeHead(404,{});
                res.end();
                //perhaps write 404?
            }
        });

        query.on('row', function(row) {
            if(!success) {
                success = true;
                res.writeHead(200, {'Content-Type': 'text/plain'});
                res.write("<xml>");
            }
            //console.log(row);
            if(row.nodes != '{}') {
                count++;
                var subquery = client.query(createNodesForWayQuery(row.nodes));
                subquery.on('error',function(err) {});
                subquery.on('end', function() {
                    count--;
                    if(count==0)
                        res.write("</xml>");
                    res.end();
                });
                subquery.on('row', function(row) {
                    console.log(row);
                    var node = builder.begin('node')
                        .att('id', row.id)
                        .att('timetamp', toISO8601(row.tstamp))
                        .att('version', row.version)
                        .att('changeset', row.changeset_id)
                        .att('lat', row.lat)
                        .att('lon', row.lon);
                    if(row.tags != '{}') {
                        var temp = row.tags.replace("{","").replace("}","").split(",");
                        for(var x=0;x<temp.length;x=x+2)
                            node.ele('tag')
                            .att('k',escape(temp[x]))
                            .att('v',escape(temp[x+1]));
                    }
                    res.write(builder.toString({pretty:'true'}));
                });

                //console.log(createNodesForWayQuery(row.nodes));
            }

            var way = builder.begin('way')
                .att('id', row.id)
                .att('timetamp', toISO8601(row.tstamp))
                .att('version', row.version)
                .att('changeset', row.changeset_id);
            if(row.tags != '{}') {
                var temp = row.tags.replace("{","").replace("}","").split(",");
                for(var x=0;x<temp.length;x=x+2)
                    way.ele('tag')
                    .att('k',escape(temp[x]))
                    .att('v',escape(temp[x+1]));
            }

            var temp = row.nodes.replace("{","").replace("}","").split(",");
            for(var x=0;x<temp.length;x++)
                way.ele('nd')
                .att('ref',temp[x]);

            res.write(builder.toString({pretty:'true'}));
        });
    });
}

function relationWorldHandler(req, res, key, value) {
    res.writeHead(200, {'Content-Type': 'text/plain'});
    res.end(' key:' +key +' value:'+value+'!\n');
}

function relationBboxHandler(req, res, key, value, left, bottom, right, top) {

}

myRoutes = clutch.route404([
    //['GET /api/(\\w+)(\\[bbox=(\\d,\\d,\\d,\\d)\\])*\\[(\\w+)=(\\w+)\\]$', helloSomeone],
    ['GET /api/node\\[(\\w+)=(\\w+)\\]$',nodeWorldHandler],
    //['GET /api/node\\[(\\w+)=(\\w+)\\]\\[bbox=(\\d+(\\.\\d+)?),(\\d+),(\\d+),(\\d+)\\]$',nodeBboxHandler],
    ['GET /api/node\\[(\\w+)=(\\w+)\\]\\[bbox=(\\d+(?:\\.\\d+)?),(\\d+(?:\\.\\d+)?),(\\d+(?:\\.\\d+)?),(\\d+(?:\\.\\d+)?)\\]$',nodeBboxHandler],
    //['GET /api/node\\[(\\w+)=(\\w+)\\]\\[bbox=(\\d+\\.\\d+),(\\d+),(\\d+),(\\d+)\\]$',nodeBboxHandler],
    ['GET /api/way\\[(\\w+)=(\\w+)\\]$',wayWorldHandler],
    ['GET /api/way\\[(\\w+)=(\\w+)\\]\\[bbox=(\\d+(?:\\.\\d+)?),(\\d+(?:\\.\\d+)?),(\\d+(?:\\.\\d+)?),(\\d+(?:\\.\\d+)?)\\]$',wayBboxHandler],
    ['GET /api/relation\\[(\\w+)=(\\w+)\\]$',relationWorldHandler],
    //['GET /api/relation\\[(\\w+)=(\\w+)\\](\\[bbox=(\\d),(\\d),(\\d),(\\d)\\])$',relationBboxHandler],
]);


var http = require('http');
http.createServer(myRoutes).listen(config.port, config.host);
logger.info("Started server at " + config.host + ":" + config.port );