Weather Channel service gists

checkError.js

// Checks if the API response contains an error and adds an error parameter
// Also logs to error stream
function checkError(result) {
  var resultJSON = JSON.parse(result);
  var errors = resultJSON.errors;
  if (errors !== null && errors !== undefined) {
    // Create log entries for each returned error
    if (errors.length > 0) {
      for (var i=0; i < errors.length; i++) {
        console.error("(" + errors[i].error.code + "): " + errors[i].error.message);
      }
    }
    resultJSON.error = true;
    return JSON.stringify(resultJSON);
  }
  else {
    resultJSON.error = false;
    return JSON.stringify(resultJSON);
  }
}

getCurrentConditions.js

// Gets weather data for lat/lon on current date
function getCurrentConditions(lat, lon, cb) {
  // Builds REST URL for requesting current weather
  var url, requestOpts;
  // Request for the full TWC API
  if (this.full) {
    console.log("Getting current conditions from TWC");
    url = "http://api.weather.com/v1/geocode//" +
          lat + "/" + lon +
          "/observations/current.json";

    requestOpts = {
      url: url,
      qs: {
        apiKey:   apiKey,
        language: "en-US",
        units:    "e"
      }
    };
  }
  // Request for the Insights for Weather service
  else {
    console.log("Getting current conditions from Weather Insights");
    url = "https://" + username + ":" + password + "@twcservice.mybluemix.net/api/weather/v1/geocode" +
          lat + "/" + lon +
          "/observations.json?language=en-US&units=e";

    requestOpts = {
      url: url
    };
  }
  
  // Returns current weather data for input lat/lon
  request(requestOpts, function(err, message, result) {
    result = checkError(result);
    cb(result);
  })
}

getHistoricalConditions.js

// Gets weather data for lat/lon on past 10 years on current date
function getHistoricConditions(lat, lon, cb) {
  var dates = [];
  var date = new Date();
  var year = date.getYear()  + 1900;
  var mon  = date.getMonth() + 1;
  var day  = date.getDate();

  // Adjusts date if Feb 28
  if ((mon == 2) && (day == 29)) day = 28;

  // Adds dates from past 10 years to dates[] array
  for (var i=1; i<11; i++) {
    var hDate = "" + (year-i) + "" + right(mon,0,2) + "" + right(day,0,2);
    dates.push(hDate);
  }

  var dateReqs = dates.map(function(date, i) {
    return function(cb) { getOneHC(lat, lon, dates[i], cb); };
  });
  
  // Makes all REST calls for historical weather data in parallel
  async.parallel(dateReqs, function(err, results) {
    results = results.map(function(result) {
      return JSON.parse(result);
    })
    cb(results);
  })
}

getOneHC.js

// Gets weather for lat/lon on a single historical date
function getOneHC(lat, lon, date, cb) {
  // Builds REST URL for requesting historical weather
  var url = "http://api.weather.com/v1/geocode/" +
        lat + "/" + lon +
        "/observations/historical.json";

  var requestOpts = {
    url: url,
    qs: {
      apiKey:   this.apiKey, // Your API key here
      language: "en-US",
      units:    "e",
      startDate: date, // 201406153
    }
  };

  // Returns historical weather data for input lat/lon
  request(requestOpts, function(err, message, result) {
    result = checkError(result);
    var resultJSON = JSON.parse(result);
    if (!resultJSON.error) {
      // Ensure observations are available, otherwise mark an error
      if (resultJSON.observations.length > 0) {
        // Get midday recording and replace array with this observation
        var midIndex = Math.floor(resultJSON.observations.length / 2);
        resultJSON.observations = [ resultJSON.observations[midIndex] ];
      }
      else
        resultJSON.error = true;
      result = JSON.stringify(resultJSON);
    }
    cb(null,result);
  })
}

getPastConditions.js

// Gets weather data for lat/lon on input date
function getPastConditions(lat, lon, month, day, year, cb) {
  // Adjusts date if Feb 28
  if ((month == 2) && (day == 29)) day = 28;

  // Create date string from input parameters
  date = "" + (year) + "" + right(month,0,2) + "" + right(day,0,2);

  getOneHC(lat, lon, date, function(err, result) {
    cb(result)
  })
}