Initial version of Node.js rewrite
This commit is contained in:
Samer Albahra
254
routes/weather.js
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254
routes/weather.js
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// Define regex filters to match against location
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var http = require( "http" ),
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filters = {
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gps: /^[-+]?([1-8]?\d(\.\d+)?|90(\.0+)?),\s*[-+]?(180(\.0+)?|((1[0-7]\d)|([1-9]?\d))(\.\d+)?)$/,
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pws: /^(?:pws|icao):/,
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url: /^https?:\/\/([\w\.-]+)(:\d+)?(\/.*)?$/,
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time: /(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})([+-])(\d{2})(\d{2})/
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};
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// Generic HTTP request handler that parses the URL and uses the
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// native Node.js http module to perform the request
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function httpRequest( url, callback ) {
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url = url.match( filters.url );
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var options = {
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host: url[1],
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port: url[2] || 80,
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path: url[3]
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};
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http.get( options, function( response ) {
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var data = "";
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// Reassemble the data as it comes in
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response.on( "data", function( chunk ) {
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data += chunk;
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} );
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// Once the data is completely received, return it to the callback
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response.on( "end", function() {
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callback( data );
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} );
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} ).on( "error", function() {
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// If the HTTP request fails, return false
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callback( false );
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} );
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}
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// Converts IP string to integer
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function ipToInt( ip ) {
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ip = ip.split( "." );
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return ( ( ( ( ( ( +ip[0] ) * 256 ) + ( +ip[1] ) ) * 256 ) + ( +ip[2] ) ) * 256 ) + ( +ip[3] );
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}
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// Takes a PWS or ICAO location and resolves the GPS coordinates
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function getPWSCoordinates( location, weatherUndergroundKey, callback ) {
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var url = "http://api.wunderground.com/api/" + weatherUndergroundKey +
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"/conditions/forecast/q/" + encodeURIComponent( location ) + ".json";
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httpRequest( url, function( data ) {
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data = JSON.parse( data );
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if ( typeof data === "object" && data.current_observation && data.current_observation.observation_location ) {
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callback( [ data.current_observation.observation_location.latitude,
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data.current_observation.observation_location.longitude ] );
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} else {
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callback( false );
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}
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} );
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}
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// If location does not match GPS or PWS/ICAO, then attempt to resolve
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// location using Weather Underground autocomplete API
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function resolveCoordinates( location, callback ) {
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var url = "http://autocomplete.wunderground.com/aq?h=0&query=" +
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encodeURIComponent( location );
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httpRequest( url, function( data ) {
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data = JSON.parse( data );
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if ( data.hasOwnProperty( "RESULTS" ) ) {
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callback( [ data.RESULTS[0].lat, data.RESULTS[0].lon ] );
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}
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} );
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}
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// Accepts a time string formatted in ISO-8601 and returns the timezone.
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// The timezone output is formatted for OpenSprinkler Unified firmware.
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function getTimezone( time ) {
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var time = time.match( filters.time ),
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hour = parseInt( time[7] + time[8] ),
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minute = parseInt( time[9] );
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minute = ( minute / 15 >> 0 ) / 4.0;
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hour = hour + ( hour >=0 ? minute : -minute );
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return ( ( hour + 12 ) * 4 ) >> 0;
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}
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// API Handler when using the weatherX.py where X represents the
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// adjustment method which is encoded to also carry the watering
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// restriction and therefore must be decoded
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exports.getWeather = function( req, res ) {
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var adjustmentMethod = req.params[0] & ~( 1 << 7 ),
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adjustmentOptions = req.query.wto,
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location = req.query.loc,
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weatherUndergroundKey = req.query.key,
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outputFormat = req.query.format,
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firmwareVersion = req.query.fwv,
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remoteAddress = req.headers[ "x-forwarded-for" ].split(",")[0] || req.connection.remoteAddress,
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weather = {},
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// After the location is resolved, this function will run to complete the weather request
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getWeatherData = function() {
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// Get the API key from the environment variables
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var WSI_API_KEY = process.env.WSI_API_KEY,
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// Generate URL using The Weather Company API v1 in Imperial units
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url = "http://api.weather.com/v1/geocode/" + location[0] + "/" + location[1] +
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"/observations/current.json?apiKey=" + WSI_API_KEY + "&language=en-US&units=e";
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// Perform the HTTP request to retrieve the weather data
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httpRequest( url, function( data ) {
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weather = JSON.parse( data );
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var scale = calculateWeatherScale(),
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restrict = checkWeatherRestriction() ? 1 : 0,
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sunData = getSunData(),
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timezone = getTimezone( weather.observation.obs_time_local );
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// Return the response to the client
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if ( outputFormat === "json" ) {
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res.json( {
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scale: scale,
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restrict: restrict,
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tz: timezone,
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sunrise: sunData[0],
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sunset: sunData[1],
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eip: ipToInt( remoteAddress )
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} );
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} else {
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res.send( "&scale=" + scale +
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"&restrict=" + restrict +
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"&tz=" + timezone +
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"&sunrise=" + sunData[0] +
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"&sunset=" + sunData[1] +
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"&eip=" + ipToInt( remoteAddress )
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);
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}
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} );
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},
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getSunData = function() {
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// Sun times must be converted from strings into date objects and processed into minutes from midnight
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// TODO: Need to use the timezone to adjust sun times
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var sunrise = weather.observation.sunrise.match( filters.time ),
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sunset = weather.observation.sunset.match( filters.time );
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return [
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parseInt( sunrise[4] ) * 60 + parseInt( sunrise[5] ),
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parseInt( sunset[4] ) * 60 + parseInt( sunset[5] )
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];
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},
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calculateWeatherScale = function() {
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// Calculate the average temperature
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var temp = ( weather.observation.imperial.temp_max_24hour + weather.observation.imperial.temp_min_24hour ) / 2,
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// Relative humidity and if unavailable default to 0
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rh = weather.observation.imperial.rh || 0,
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// The absolute precipitation in the past 48 hours
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precip = weather.observation.imperial.precip_2day;
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if ( typeof temp !== "number" ) {
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// If the maximum and minimum temperatures are not available then use the current temperature
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temp = weather.observation.imperial.temp;
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}
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console.log( {
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temp: temp,
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humidity: rh,
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precip_48hr: precip
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} );
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if ( adjustmentMethod == 1 ) {
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// Zimmerman method
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var humidityFactor = ( 30 - rh ),
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tempFactor = ( ( temp - 70 ) * 4 ),
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precipFactor = ( precip * -2 );
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// Apply adjustment options if available
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if ( adjustmentOptions ) {
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if ( adjustmentOptions.hasOwnProperty( "h" ) ) {
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humidityFactor = humidityFactor * ( adjustmentOptions.h / 100 );
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}
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if ( adjustmentOptions.hasOwnProperty( "t" ) ) {
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tempFactor = tempFactor * ( adjustmentOptions.t / 100 );
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}
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if ( adjustmentOptions.hasOwnProperty( "r" ) ) {
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precipFactor = precipFactor * ( adjustmentOptions.r / 100 );
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}
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}
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return parseInt( Math.min( Math.max( 0, 100 + humidityFactor + tempFactor + precipFactor ), 200 ) );
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}
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return -1;
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},
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checkWeatherRestriction = function() {
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var californiaRestriction = ( req.params[0] >> 7 ) & 1;
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if ( californiaRestriction ) {
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// If the California watering restriction is in use then prevent watering
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// if more then 0.01" of rain has accumulated in the past 48 hours
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if ( weather.observation.imperial.precip_2day > 0.01 ) {
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return true;
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}
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}
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return false;
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};
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// Parse weather adjustment options
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try {
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// Reconstruct JSON string from deformed controller output
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adjustmentOptions = JSON.parse( "{" + adjustmentOptions + "}" );
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} catch (err) {
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adjustmentOptions = false;
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}
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// Parse location string
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if ( filters.gps.test( location ) ) {
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// Handle GPS coordinates
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location = location.split( "," );
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location = [ parseFloat( location[0] ), parseFloat( location[1] ) ];
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getWeatherData();
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} else if ( filters.pws.test( location ) ) {
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// Handle Weather Underground specific location
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getPWSCoordinates( location, weatherUndergroundKey, function( result ) {
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location = result;
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getWeatherData();
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} );
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} else {
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// Attempt to resolve provided location to GPS coordinates
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resolveCoordinates( location, function( result ) {
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location = result;
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getWeatherData();
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} );
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}
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};
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