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forecasts.js
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forecasts.js
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//
// exports
//
var forecasts = module.exports = {};
//
// required packages
//
var fs = require('fs');
var winston = require('winston');
var request = require('request');
var moment = require('moment');
var underscore = require('underscore');
var async = require('async');
var xml2js = require('xml2js');
var cheerio = require('cheerio');
// avi danger levels
forecasts.AVI_LEVEL_UNKNOWN = 0;
forecasts.AVI_LEVEL_LOW = 1;
forecasts.AVI_LEVEL_MODERATE = 2;
forecasts.AVI_LEVEL_CONSIDERABLE = 3;
forecasts.AVI_LEVEL_HIGH = 4;
forecasts.AVI_LEVEL_EXTREME = 5;
// time intervals
// NOTE to ensure forecasts get generated, ensure FORECAST_GEN_INTERVAL_SECONDS >> DATA_REQUEST_TIMEOUT_SECONDS
// NOTE the total delay that a client might see from forecast issued to available at client is the sum
// of FORECAST_GEN_INTERVAL_SECONDS + CACHE_MAX_AGE_SECONDS
forecasts.DATA_REQUESTS_IN_PARALLEL = 10;
forecasts.DATA_REQUEST_TIMEOUT_SECONDS = 15;
forecasts.FORECAST_GEN_INTERVAL_SECONDS = 300;
forecasts.CACHE_MAX_AGE_SECONDS = 60;
// filepaths
forecasts.STATIC_FILES_DIR_PATH = __dirname + '/public';
forecasts.REGIONS_PATH = __dirname + '/public/v1/regions.json';
forecasts.FORECASTS_DATA_PATH = __dirname + '/public/v1/forecasts.json';
forecasts.FORECASTS_DATA_TEMP_PATH = __dirname + '/public/v1/forecasts_TEMP.json';
forecasts.TEMPLATE_FILES_DIR_PATH = __dirname + '/templates';
// generated forecast tracking
// NOTE these are only kept for the life of a single process, not across process restarts
forecasts.forecastGenerationCount = 0;
forecasts.mostRecentForecasts = [];
forecasts.aggregateForecasts = function(regions = []) {
winston.info('aggregateForecasts: initiated');
if (regions.length === 0) {
regions = JSON.parse(fs.readFileSync(forecasts.REGIONS_PATH, 'utf8'));
}
var startTime = new Date();
var forecastsArray = [];
var invalidCount = 0;
async.forEachLimit(
regions,
forecasts.DATA_REQUESTS_IN_PARALLEL,
function(region, callback) {
var regionId = region.regionId;
forecasts.forecastForRegion(region, function(forecast) {
// sanity check the forecast
var valid = forecasts.validateForecast(region, forecast, true);
if (!valid) {
invalidCount++;
}
// add the forecast to the forecasts array
// NOTE the order of forecast generation completion is not deterministic, so they may end up in any
// order in the array
forecastsArray.push({regionId:regionId, forecast:forecast});
winston.info('generated forecast for regionId: ' + regionId + '; count generated so far: ' + forecastsArray.length);
// continue even on error
callback(null);
});
},
function() {
var endTime = new Date();
var elapsedTime = endTime.getTime() - startTime.getTime();
if (regions.length !== forecastsArray.length) {
winston.warn('aggregateForecasts: forecast generation error, expected count of forecasts: ' + regions.length + '; actual: ' + forecastsArray.length);
}
winston.info('aggregateForecasts: all forecasts processed, region count: ' + forecastsArray.length + '; elapsed time (ms): ' + elapsedTime);
if (invalidCount > 0) {
winston.warn('aggregateForecasts: there were invalid forecasts; invalid forecast count: ' + invalidCount);
} else {
winston.info('aggregateForecasts: all forecasts valid');
}
// write the forecasts out to a static json file, that can be served by the HTTP server
// NOTE to ensure atomicity at the filesystem level, we write out to a temporary file, and
// then move it into place, overwriting the old file
fs.writeFile(forecasts.FORECASTS_DATA_TEMP_PATH, JSON.stringify(forecastsArray, null, 4), 'utf8',
function() {
fs.rename(forecasts.FORECASTS_DATA_TEMP_PATH, forecasts.FORECASTS_DATA_PATH,
function() {
winston.info('aggregateForecasts: forecast data file updated; path: ' + forecasts.FORECASTS_DATA_PATH);
forecasts.forecastGenerationCount++;
}
);
}
);
}
);
};
forecasts.validateForecast = function(region, forecast, validateForCurrentDay) {
// BUGBUG how do we deal with centers shutting down for the season???
var validForecast = true;
var regionId = region.regionId;
var centerId = region.centerId;
if (!forecast) {
// check for null forecast
// NOTE known exceptions: these regions currently do not provide any danger level ratings
if (regionId === 'nac_187' ||
regionId === 'nac_190' ||
regionId === 'nac_202' ||
regionId === 'nac_252' ||
regionId === 'nac_259_1' ||
regionId === 'nac_259_2' ||
regionId === 'nac_259_3' ||
regionId === 'nac_259_4' ||
regionId === 'nac_259_5' ||
regionId === 'nac_183' ||
regionId === 'nac_189' ||
regionId === 'nac_197' ||
regionId === 'nac_193' ||
regionId === 'nac_186' ||
regionId === 'nac_194' ||
regionId === 'nac_191' ||
regionId === 'nac_121' ||
regionId === 'nac_203' ||
regionId === 'nac_282' ||
regionId === 'nac_261' ||
centerId === 'caac' ||
centerId === 'juak' ||
centerId === 'wcmac' ||
centerId === 'avalanche-quebec') {
winston.info('forecast validation: as expected, got null forecast; regionId: ' + regionId);
} else {
validForecast = false;
winston.warn('forecast validation: UNEXPECTED got null forecast; regionId: ' + regionId);
}
} else if (!forecast.length) {
validForecast = false;
winston.warn('forecast validation: UNEXPECTED got empty forecast; regionId: ' + regionId);
} else {
// check forecast contents
var i;
// dates should be sequential, with no gaps
var firstDate = forecast[0].date;
for (i = 0; i < forecast.length; i++) {
var expectedDate = moment(firstDate, 'YYYY-MM-DD').add(i, 'days').format('YYYY-MM-DD');
if (expectedDate !== forecast[i].date) {
validForecast = false;
winston.warn('forecast validation: UNEXPECTED date for regionId: ' + regionId + '; forecast: ' + JSON.stringify(forecast));
break;
}
}
// aviLevel should never be null
for (i = 0; i < forecast.length; i++) {
if (!(forecast[i].aviLevel >= forecasts.AVI_LEVEL_UNKNOWN && forecast[i].aviLevel <= forecasts.AVI_LEVEL_EXTREME)) {
winston.warn('forecast validation: UNEXPECTED BUG!!! got invalid aviLevel in forecast; regionId: ' + regionId + '; forecast: ' + JSON.stringify(forecast));
break;
}
}
// aviLevel should not be AVI_LEVEL_UNKNOWN
for (i = 0; i < forecast.length; i++) {
if (forecast[i].aviLevel === forecasts.AVI_LEVEL_UNKNOWN) {
// NOTE known exceptions: certain regions always/sometimes posts forecasts with a valid issued date but
// without danger level ratings
if (regionId === 'nac_60' ||
regionId === 'ca_kananaskis' ||
regionId === 'ca_long-range-mountains' ||
centerId === 'wac' ||
centerId === 'ipac') {
winston.info('forecast validation: as expected, got aviLevel 0 in forecast; regionId: ' + regionId);
} else {
validForecast = false;
winston.warn('forecast validation: UNEXPECTED got aviLevel 0 in forecast; regionId: ' + regionId + '; forecast: ' + JSON.stringify(forecast));
break;
}
}
}
// if things look good so far, continue the validation
if (validForecast && validateForCurrentDay) {
validForecast = forecasts.validateForecastForCurrentDay(region, forecast);
}
}
return validForecast;
};
forecasts.validateForecastForCurrentDay = function(region, forecast) {
var regionId = region.regionId;
var centerId = region.centerId;
// BUGBUG when run early in the morning, some centers haven't issued their forecasts for the day yet...
var validForecast = false;
if (forecast) {
// get the current date
// NOTE timezones are tricky... first offset by the timezone that the environment is in to get back to UTC time,
// then offset to get to PST, which is what we use for our checking (close enough for now)
var timezoneOffsetMinutes = moment().utcOffset();
var pstOffsetMinutes = 8 * 60;
var currentPSTDate = moment().subtract(timezoneOffsetMinutes, 'minutes').subtract(pstOffsetMinutes, 'minutes').format('YYYY-MM-DD');
winston.verbose('forecast validation: right now the PST date is: ' + currentPSTDate);
for (var i = 0; i < forecast.length; i++) {
if (forecast[i].date === currentPSTDate) {
validForecast = true;
winston.info('forecast validation: as expected, found forecast for current day; regionId: ' + regionId);
break;
}
}
if (!validForecast) {
// NOTE known exceptions: certain regions do not issue new forecasts daily, so this case can happen
if (regionId === 'ca_long-range-mountains' || centerId === 'wcmac') {
validForecast = true;
winston.info('forecast validation: as expected, did not find forecast for current day; regionId: ' + regionId);
} else {
winston.warn('forecast validation: UNEXPECTED did not find forecast for current day; current date: ' + currentPSTDate +
'; regionId: ' + regionId + '; forecast: ' + JSON.stringify(forecast));
}
}
}
return validForecast;
};
forecasts.forecastForRegion = function(region, onForecast) {
var regionDetails = forecasts.getRegionDetailsForRegion(region);
var forecast = null;
var regionId = region.regiondId;
if (!regionDetails) {
winston.warn('invalid regionId: ' + regionId);
process.nextTick(function() { onForecast(null); } );
} else {
var requestOptions = {
url:regionDetails.dataURL,
headers:{'User-Agent':'avalancheforecasts.com'},
jar:false,
timeout:(forecasts.DATA_REQUEST_TIMEOUT_SECONDS * 1000)
};
request(requestOptions,
function(error, response, body) {
// BUGBUG should check status code too, but as of 2014-12-26, PAC returns its advisory page with a 404!
// && response.statusCode >= 200 && response.statusCode <= 299
if (!error) {
winston.info('successful dataURL response; regionId: ' + regionDetails.regionId +
'; dataURL: ' + regionDetails.dataURL);
try {
forecast = regionDetails.parser(body, regionDetails);
} catch (e) {
winston.warn('parse failure; regionId: ' + regionDetails.regionId + '; exception: ' + e);
}
if (forecast) {
// cache the result
forecasts.mostRecentForecasts[regionId] = forecast;
}
onForecast(forecast);
} else {
winston.warn('failed dataURL response; regionId: ' + regionDetails.regionId + '; dataURL: ' +
regionDetails.dataURL + '; response status code: ' + (response ? response.statusCode : '[no response]') + '; error: ' + error);
// if there is a cached forecast for this region, fall back to that
if (forecasts.mostRecentForecasts[regionId]) {
forecast = forecasts.mostRecentForecasts[regionId];
winston.info('using cached value, due to error, for region: ' + regionId + '; forecast: ' + JSON.stringify(forecast));
}
onForecast(forecast);
}
}
);
}
};
forecasts.getRegionDetailsForRegion = function(region) {
var regionDetails = null;
var regionId = region.regionId;
var centerId = region.centerId;
if (centerId) {
// NOTE split the regionId at the first underscore, into two pieces
var index = regionId.indexOf('_');
if (index !== -1) {
var components = [regionId.slice(0, index), regionId.slice(index + 1)];
// NOTE the URLs used here by the server for pull data may be different than the URLs for users viewing the
// corresponding forecast as a web page
var dataURL = null;
var parser = null;
switch (centerId) {
case 'kananaskis':
case 'avalanche-canada':
// CAC South Coast has two polygons that have the same forecast; handle that
var subRegion = components[1].split('_')[0];
dataURL = 'https://www.avalanche.ca/api/forecasts/' + subRegion + '.json';
parser = forecasts.parseForecast_cac;
break;
case 'parks-canada':
dataURL = forecasts.getDataURL_pc(components[1])
parser = forecasts.parseForecast_pc;
break;
case 'avalanche-quebec':
dataURL = 'https://avalanchequebec.ca/conditions-chic-chocs#bulletins-avalanche';
// NOTE parser is temporarily disabled
//parser = forecasts.parseForecast_hg;
parser = forecasts.parseForecast_noop;
break;
case 'nwac':
dataURL = 'https://api.avalanche.org/v1/forecast/get-map-data/NWAC';
parser = forecasts.parseForecast_avalanche_org_api;
break;
case 'caic':
// NOTE look up the data url (because of the more complex mapping)
dataURL = forecasts.getDataURL_caic(components[1]);
parser = forecasts.parseForecast_simple_caaml;
break;
case 'viac':
dataURL = 'https://www.islandavalanchebulletin.com/';
// NOTE parser is temporarily disabled
//parser = forecasts.parseForecast_viac;
parser = forecasts.parseForecast_noop;
break;
case 'sac':
dataURL = 'https://api.avalanche.org/v1/forecast/get-map-data/SAC';
parser = forecasts.parseForecast_avalanche_org_api;
break;
case 'esac':
dataURL = 'https://api.avalanche.org/v1/forecast/get-map-data/ESAC';
parser = forecasts.parseForecast_avalanche_org_api;
break;
case 'pac':
dataURL = 'https://api.avalanche.org/v1/forecast/get-map-data/PAC';
parser = forecasts.parseForecast_avalanche_org_api;
break;
case 'btac':
dataURL = forecasts.getDataURL_btac(components[1]);
parser = forecasts.parseForecast_simple_caaml;
break;
case 'wcmac':
dataURL = 'https://api.avalanche.org/v1/forecast/get-map-data/WCMAC';
parser = forecasts.parseForecast_avalanche_org_api;
break;
case 'snfac':
dataURL = 'https://api.avalanche.org/v1/forecast/get-map-data/SNFAC';
parser = forecasts.parseForecast_avalanche_org_api;
break;
case 'ipac':
dataURL = 'https://api.avalanche.org/v1/forecast/get-map-data/IPAC';
parser = forecasts.parseForecast_avalanche_org_api;
break;
case 'fac':
dataURL = 'https://api.avalanche.org/v1/forecast/get-map-data/FAC';
parser = forecasts.parseForecast_avalanche_org_api;
break;
case 'cnfaic':
dataURL = 'https://api.avalanche.org/v1/forecast/get-map-data/CNFAIC';
parser = forecasts.parseForecast_avalanche_org_api;
break;
case 'juak':
case 'caac':
dataURL = 'https://beta.juneau.org/emergency/current-advisory';
// NOTE parser is temporarily disabled
//parser = forecasts.parseForecast_jac;
parser = forecasts.parseForecast_noop;
break;
case 'ctcak':
dataURL = 'https://www.cityofcordova.net/residents/a-safe-cordova/avalanche-conditions';
parser = forecasts.parseForecast_noop;
break;
case 'hpac':
dataURL = 'http://hatcherpassavalanchecenter.org/';
parser = forecasts.parseForecast_noop;
break;
case 'kpac':
dataURL = 'https://kachinapeaks.org/snowpack';
parser = forecasts.parseForecast_noop;
break;
case 'wac':
dataURL = 'https://api.avalanche.org/v1/forecast/get-map-data/WAC';
parser = forecasts.parseForecast_avalanche_org_api;
break;
case 'msac':
dataURL = 'https://api.avalanche.org/v1/forecast/get-map-data/MSAC';
parser = forecasts.parseForecast_avalanche_org_api;
break;
case 'aaic':
dataURL = 'https://api.avalanche.org/v1/forecast/get-map-data/AAIC';
parser = forecasts.parseForecast_avalanche_org_api;
break;
case 'uac':
dataURL = 'https://api.avalanche.org/v1/forecast/get-map-data/UAC';
parser = forecasts.parseForecast_avalanche_org_api;
break;
case 'bac':
dataURL = 'https://api.avalanche.org/v1/forecast/get-map-data/BAC';
parser = forecasts.parseForecast_avalanche_org_api;
break;
case 'coaa':
dataURL = 'https://api.avalanche.org/v1/forecast/get-map-data/COAA';
parser = forecasts.parseForecast_avalanche_org_api;
break;
case 'gnfac':
dataURL = 'https://api.avalanche.org/v1/forecast/get-map-data/GNFAC';
parser = forecasts.parseForecast_avalanche_org_api;
break;
case 'tac':
dataURL = 'https://api.avalanche.org/v1/forecast/get-map-data/TAC';
parser = forecasts.parseForecast_avalanche_org_api;
break;
case 'mwac':
dataURL = 'https://api.avalanche.org/v1/forecast/get-map-data/MWAC';
parser = forecasts.parseForecast_avalanche_org_api;
break;
default:
winston.warn('no match for regionId: ' + regionId);
break;
}
if (dataURL) {
regionDetails = {'regionId': regionId, 'provider': centerId, 'subregion': components[1], 'dataURL': dataURL, 'parser': parser};
winston.verbose('regionDetails: ' + JSON.stringify(regionDetails));
}
}
}
return regionDetails;
};
forecasts.getDataURL_pc = function(subregion) {
var dataURL = null;
var baseURL = 'https://avalanche.pc.gc.ca/CAAML-eng.aspx?d=TODAY&r=';
switch (subregion) {
case 'banff':
dataURL = baseURL + '1';
break;
case 'jasper':
dataURL = baseURL + '2';
break;
case 'glacier':
dataURL = baseURL + '3';
break;
case 'waterton':
dataURL = baseURL + '4';
break;
case 'littleYoho':
dataURL = baseURL + '5';
break;
default:
winston.warn('getDataURL_pc: no match for subregion: ' + subregion);
break;
}
return dataURL;
}
forecasts.getDataURL_caic = function(subregion) {
var dataURL = null;
var baseURL = 'https://avalanche.state.co.us/media/xml/';
switch (subregion) {
case '551_1':
case '551_2':
dataURL = baseURL + 'Steamboat_and_Flat_Tops_Avalanche_Forecast.xml';
break;
case '552':
dataURL = baseURL + 'Sangre_de_Cristo_Avalanche_Forecast.xml';
break;
case '553_1':
case '553_2':
dataURL = baseURL + 'Front_Range_Avalanche_Forecast.xml';
break;
case '554':
dataURL = baseURL + 'Vail_and_Summit_County_Avalanche_Forecast.xml';
break;
case '555':
dataURL = baseURL + 'Sawatch_Range_Avalanche_Forecast.xml';
break;
case '556':
dataURL = baseURL + 'Aspen_Avalanche_Forecast.xml';
break;
case '557':
dataURL = baseURL + 'Gunnison_Avalanche_Forecast.xml';
break;
case '558':
dataURL = baseURL + 'Grand_Mesa_Avalanche_Forecast.xml';
break;
case '559':
dataURL = baseURL + 'Northern_San_Juan_Avalanche_Forecast.xml';
break;
case '560':
dataURL = baseURL + 'Southern_San_Juan_Avalanche_Forecast.xml';
break;
default:
winston.warn('getDataURL_caic: no match for subregion: ' + subregion);
break;
}
return dataURL;
};
forecasts.getDataURL_btac = function(subregion) {
var dataURL = null;
var baseURL = 'https://www.jhavalanche.org/media/xml/';
switch (subregion) {
case '1':
dataURL = baseURL + 'teton_Avalanche_Forecast.xml';
break;
case '2':
dataURL = baseURL + 'tog_Avalanche_Forecast.xml';
break;
case '3':
dataURL = baseURL + 'grey_Avalanche_Forecast.xml';
break;
default:
winston.warn('getDataURL_btac: no match for subregion: ' + subregion);
break;
}
return dataURL;
};
forecasts.findHighestAviLevelInString = function(string) {
// NOTE looks for the *highest* avi level keyword within the string
var aviLevel = forecasts.AVI_LEVEL_UNKNOWN;
// various cases handled:
// * mixed case
// * not matching keywords showing up inside other words, like "high" in "highway"
// * no whitespace, whitespace, or multiple whitespace
// * multiple keywords, same or different, within the string
if (string && typeof(string) === 'string') {
var levelMatch = string.match(/\b(low|moderate|considerable|high|extreme)\b/gi);
if (levelMatch && levelMatch.length > 0) {
// scan the matches, and take the highest level found
for (var i = 0; i < levelMatch.length; i++) {
winston.verbose('levelMatch[' + i + ']: ' + levelMatch[i]);
aviLevel = Math.max(aviLevel, forecasts.aviLevelFromName(levelMatch[i]));
}
}
}
return aviLevel;
};
forecasts.aviLevelFromName = function(aviLevelName) {
// convert avi level name to number
var aviLevel = forecasts.AVI_LEVEL_UNKNOWN;
if (aviLevelName) {
switch (aviLevelName.trim().toLowerCase()) {
case 'low':
aviLevel = forecasts.AVI_LEVEL_LOW;
break;
case 'moderate':
aviLevel = forecasts.AVI_LEVEL_MODERATE;
break;
case 'considerable':
aviLevel = forecasts.AVI_LEVEL_CONSIDERABLE;
break;
case 'high':
aviLevel = forecasts.AVI_LEVEL_HIGH;
break;
case 'extreme':
aviLevel = forecasts.AVI_LEVEL_EXTREME;
break;
default:
break;
}
}
return aviLevel;
};
String.prototype.trim = function() {
return this.replace(/^\s+/, '').replace(/\s+$/, '');
};
forecasts.findAviLevelNumberInString = function(string) {
var aviLevel = forecasts.AVI_LEVEL_UNKNOWN;
if (string) {
aviLevel = parseInt(string);
// sanity check the value
if (!(aviLevel >= forecasts.AVI_LEVEL_UNKNOWN && aviLevel <= forecasts.AVI_LEVEL_EXTREME)) {
aviLevel = forecasts.AVI_LEVEL_UNKNOWN;
}
}
return aviLevel;
};
forecasts.parseForecast_noop = function() {
return null;
};
forecasts.parseForecast_nwac = function(body, regionDetails) {
var forecast = null;
try {
// convert the JSON response to an object
// NOTE the most recent forecast is is .objects[0]
var bodyJson = JSON.parse(body).objects[0];
// nwac forecasts go 2 days out; typically they are issued the evening before, for the following two days,
// although sometimes they are issued the same day
var NUM_FORECAST_DAYS_NWAC = 2;
var forecastDateDay1 = moment(bodyJson['day1_date'], 'YYYY-MM-DD').format('YYYY-MM-DD');
forecast = [];
for (var i = 0; i < NUM_FORECAST_DAYS_NWAC; i++) {
// NOTE one-based index
var forecastIndex = i + 1;
var forecastDate = moment(forecastDateDay1).clone().add(i, 'days').format('YYYY-MM-DD');
var aviLevel = forecasts.getAviLevelForForecastDayIndex_nwac(bodyJson, regionDetails, forecastIndex);
forecast[i] = {'date':forecastDate, 'aviLevel':aviLevel};
}
// if the forecast was issued the day before the first forecast day, copy the forecast from that
// first forecast day into the forecast issued day too
var forecastIssuedDate = moment(bodyJson.publish_date, 'YYYY-MM-DD HH-mm-ss');
var dayAfterForecastIssuedDate = moment(forecastIssuedDate).clone().add(1, 'days').format('YYYY-MM-DD');
if (dayAfterForecastIssuedDate === forecast[0].date) {
// create an entry at the front of the forecast array for the forecast issued date, with the aviLevel of the following day
var issuedDateForecast = {date: moment(forecastIssuedDate).format('YYYY-MM-DD'), aviLevel: forecast[0].aviLevel};
forecast.unshift(issuedDateForecast);
}
for (var j = 0; j < forecast.length; j++) {
winston.verbose('regionId: ' + regionDetails.regionId + '; forecast[' + j + ']: ' + JSON.stringify(forecast[j]));
}
} catch (e) {
winston.warn('failure parsing NWAC forecast; error: ' + JSON.stringify(e));
}
return forecast;
};
forecasts.getAviLevelForForecastDayIndex_nwac = function(bodyJson, regionDetails, forecastIndex) {
return Math.max(
forecasts.findHighestAviLevelInString(bodyJson['day' + forecastIndex + '_danger_elev_high']),
forecasts.findHighestAviLevelInString(bodyJson['day' + forecastIndex + '_danger_elev_middle']),
forecasts.findHighestAviLevelInString(bodyJson['day' + forecastIndex + '_danger_elev_low']));
};
forecasts.parseForecast_cac = function(body, regionDetails) {
var forecast = null;
try {
var bodyJson = JSON.parse(body);
// NOTE create an extra slot for the day before the first described day, as sometimes the forecast is issued
// with the first described day as the following day; we want to show some forecast for the time until
// the following day kicks in, so we assume in this case the the danger level for the first described day
// is also applicable to the time between when the forecast is issued and the first described day
forecast = [];
for (var i = 0; i < bodyJson.dangerRatings.length; i++) {
var endDate = moment.utc(bodyJson.dangerRatings[i].date).format('YYYY-MM-DD');
var startDate = moment(endDate, 'YYYY-MM-DD').subtract(1, 'days');
// NOTE cac organizes forecasts by multiple elevation zones within a given day;
// take the highest danger level listed for each day
// NOTE not all 3 fields (Alp/Tln/Btl) are necessarily present
var aviLevel = Math.max(
forecasts.findHighestAviLevelInString(bodyJson.dangerRatings[i].dangerRating.alp),
forecasts.findHighestAviLevelInString(bodyJson.dangerRatings[i].dangerRating.tln),
forecasts.findHighestAviLevelInString(bodyJson.dangerRatings[i].dangerRating.btl));
// NOTE copy the first described day's forecast to the day before (see note above)
// NOTE this also assumes the days are listed in chronological order in the input data
if (i === 0) {
// calculate the day before
var dayBeforeFirstDate = moment(startDate, 'YYYY-MM-DD').subtract(1, 'days');
forecast[0] = {'date': moment(dayBeforeFirstDate).format('YYYY-MM-DD'), 'aviLevel': aviLevel};
}
// put this described day in the array, shifted by one position
forecast[i+1] = {'date': startDate, 'aviLevel': aviLevel};
}
for (var j = 0; j < forecast.length; j++) {
winston.verbose('regionId: ' + regionDetails.regionId + '; forecast[' + j + ']: ' + JSON.stringify(forecast[j]));
}
} catch (e) {
winston.warn('parse failure; regionId: ' + regionDetails.regionId + '; exception: ' + e);
forecast = null;
}
return forecast;
};
forecasts.parseForecast_pc = function(body, regionDetails) {
var forecast = null;
var parser = new xml2js.Parser(xml2js.defaults['0.1']);
// NOTE this block is called synchronously with parsing, even though it looks async
parser.parseString(body, function(err, result) {
try {
var dayForecasts = result.observations.Bulletin.bulletinResultsOf.BulletinMeasurements.dangerRatings.DangerRating;
forecast = [];
const forecastsByDay = {};
for (const dayForecast of dayForecasts) {
const timePosition = dayForecast.validTime.TimeInstant.timePosition;
const date = forecasts.dateStringFromDateTimeString_caaml(timePosition);
if (!(date in forecastsByDay)) {
forecastsByDay[date] = [];
}
let aviLevel = dayForecast.mainValue;
if (aviLevel == 'N/A') {
aviLevel = 0;
} else {
aviLevel = parseInt(aviLevel);
}
forecastsByDay[date].push(aviLevel);
}
for (const [date, aviLevels] of Object.entries(forecastsByDay)) {
forecast.push({date: date, aviLevel: Math.max(...aviLevels)});
}
// NOTE create an extra slot for the day before the first described day, as sometimes the forecast is issued
// with the first described day as the following day; we want to show some forecast for the time until
// the following day kicks in, so we assume in this case the the danger level for the first described day
// is also applicable to the time between when the forecast is issued and the first described day;
forecast.sort((l, r) => { return l.date.localeCompare(r.date); });
const previousDay = moment(forecast[0].date).subtract(1, 'days').format('YYYY-MM-DD');
forecast.unshift({date: previousDay, aviLevel: forecast[0].aviLevel});
for (var j = 0; j < forecast.length; j++) {
winston.verbose('regionId: ' + regionDetails.regionId + '; forecast[' + j + ']: ' + JSON.stringify(forecast[j]));
}
} catch (e) {
winston.warn('parse failure; regionId: ' + regionDetails.regionId + '; exception: ' + e);
}
});
return forecast;
};
forecasts.parseForecast_avalanche_org_api = function(body, regionDetails) {
var forecast = null;
try {
// convert the JSON response to an object
var bodyJson = JSON.parse(body);
// NOTE avalanche.org api region ids are not guaranteed stable over time...
var avalancheOrgApiRegionId = +(regionDetails.regionId.split('_')[1]);
var regionForecastData = underscore.findWhere(bodyJson.features, {id: avalancheOrgApiRegionId});
// NOTE the API can have null values for the dates, which means no rating available
if (regionForecastData.properties.start_date && regionForecastData.properties.end_date) {
// NOTE only parse the dates, ignore times for now
var forecastValidTimeStart = moment(regionForecastData.properties.start_date, 'YYYY-MM-DD');
var forecastValidTimeEnd = moment(regionForecastData.properties.end_date, 'YYYY-MM-DD');
var daysValid = moment(forecastValidTimeEnd).diff(moment(forecastValidTimeStart), 'days') + 1;
var aviLevel = forecasts.findAviLevelNumberInString(regionForecastData.properties.danger_level);
forecast = [];
for (var i = 0; i < daysValid; i++) {
forecast[i] = {'date': moment(forecastValidTimeStart).clone().add(i, 'days').format('YYYY-MM-DD'), 'aviLevel': aviLevel};
}
for (var j = 0; j < forecast.length; j++) {
winston.verbose('regionId: ' + regionDetails.regionId + '; forecast[' + j + ']: ' + JSON.stringify(forecast[j]));
}
}
} catch (e) {
winston.warn('failure parsing avalanche.org api forecast; error: ' + JSON.stringify(e));
}
return forecast;
};
forecasts.parseForecast_simple_caaml = function(body, regionDetails) {
var forecast = null;
var parser = new xml2js.Parser(xml2js.defaults['0.1']);
// NOTE this block is called synchronously with parsing, even though it looks async
parser.parseString(body, function(err, result) {
try {
var forecastValidTimeStart = forecasts.dateStringFromDateTimeString_caaml(result.validTime.TimePeriod.beginPosition);
var forecastValidTimeEnd = forecasts.dateStringFromDateTimeString_caaml(result.validTime.TimePeriod.endPosition);
// NOTE these sites typically issue avalanche forecasts for one day at a time; however, if a longer time
// range is specified, follow that
// moment#diff will truncate the result to zero decimal places, returning an integer, so we are being
// conservative on forecast duration
var daysValid = Math.max(moment(forecastValidTimeEnd).diff(moment(forecastValidTimeStart), 'days'), 1);
var aviLevel = forecasts.findAviLevelNumberInString(result.bulletinResultsOf.BulletinMeasurements.dangerRatings.DangerRatingSingle.mainValue);
forecast = [];
for (var i = 0; i < daysValid; i++) {
forecast[i] = {'date': moment(forecastValidTimeStart).clone().add(i, 'days').format('YYYY-MM-DD'), 'aviLevel': aviLevel};
}
for (var j = 0; j < forecast.length; j++) {
winston.verbose('regionId: ' + regionDetails.regionId + '; forecast[' + j + ']: ' + JSON.stringify(forecast[j]));
}
} catch (e) {
winston.warn('parse failure; regionId: ' + regionDetails.regionId + '; exception: ' + e);
}
});
return forecast;
};
forecasts.dateStringFromDateTimeString_caaml = function(dateTimeString) {
// NOTE typical date string: '2012-02-02T18:14:00' or '2012-02-10T00:00:00Z'
return dateTimeString.slice(0,10);
};
forecasts.parseForecast_viac = function(body, regionDetails) {
var forecast = null;
var firstForecastedDate = forecasts.parseFirstForecastedDate_viac(body, regionDetails);
var aviLevels = forecasts.parseForecastValues_viac(body, regionDetails);
if (firstForecastedDate && aviLevels) {
forecast = [];
for (var i = 0; i < aviLevels.length; i++) {
forecast[i] = {'date': moment(firstForecastedDate).clone().add(i, 'days').format('YYYY-MM-DD'), 'aviLevel': aviLevels[i]};
}
for (var j = 0; j < forecast.length; j++) {
winston.verbose('regionId: ' + regionDetails.regionId + '; forecast[' + j + ']: ' + JSON.stringify(forecast[j]));
}
}
return forecast;
};
forecasts.parseFirstForecastedDate_viac = function(body, regionDetails) {
var firstForecastedDate = null;
// NOTE viac can issue forecasts the day before or the day of the first forecasted day; we need to correlate the
// forecast issued date with the days of week that are described in the forecast
var forecastIssuedDate = forecasts.parseForecastIssuedDate_viac(body, regionDetails);
var firstForecastedDayOfWeek = forecasts.parseFirstForecastedDayOfWeek_viac(body, regionDetails);
if (forecastIssuedDate && firstForecastedDayOfWeek) {
var daysOfWeek = [];
for (var i = 0; i < 2; i++) {
// copy the value of the forecast issued date, offset by the appropriate number of days, and get the day of week
daysOfWeek[i] = moment(forecastIssuedDate).clone().add(i, 'days');
if (moment(daysOfWeek[i]).format('dddd').toLowerCase() === firstForecastedDayOfWeek.toLowerCase()) {
firstForecastedDate = daysOfWeek[i];
break;
}
}
}
return firstForecastedDate;
};
forecasts.parseForecastIssuedDate_viac = function(body, regionDetails) {
var forecastIssuedDate = null;
// capture the forecast timestamp
// NOTE typical string: '<h2>Wednesday February 19, 2020</h2>'
var timestampMatch = body.match(/(January?|February?|March?|April?|May|June?|July?|August?|September?|October?|November?|December?)\s+\d{1,2},\s+\d{4}\<\/h2\>/i);
// the capture groups from the regex will be in slots 0 and 1 in the array
if (timestampMatch && timestampMatch.length === 2) {
forecastIssuedDate = moment(timestampMatch[0], 'MMM DD YYYY');
winston.verbose('found forecast issue date; regionId: ' + regionDetails.regionId + '; forecastIssuedDate: ' + moment(forecastIssuedDate).format('YYYY-MM-DD'));
} else {
winston.warn('parse failure, forecast issue date not found; regionId: ' + regionDetails.regionId);
}
return forecastIssuedDate;
};
forecasts.parseFirstForecastedDayOfWeek_viac = function(body, regionDetails) {
var firstForecastedDayOfWeek = null;
// capture the first forecasted day of week
// NOTE typical string for viac: '<h2>Wednesday February 19, 2020</h2>'
var timestampMatch = body.match(/\<h2\>(Monday?|Tuesday?|Wednesday?|Thursday?|Friday|Saturday?|Sunday?)\s+(January?|February?|March?|April?|May|June?|July?|August?|September?|October?|November?|December?)\s+\d{1,2},\s+\d{4}\<\/h2\>/i);
// the capture groups from the regex will be in slot 1 in the array
if (timestampMatch && timestampMatch.length === 3) {
firstForecastedDayOfWeek = timestampMatch[1];
winston.verbose('found first forecasted day of week; regionId: ' + regionDetails.regionId + '; firstForecastedDayOfWeek: ' + firstForecastedDayOfWeek);
} else {
winston.warn('parse failure, first forecasted day of week not found; regionId: ' + regionDetails.regionId);
}
return firstForecastedDayOfWeek;
};
forecasts.parseForecastValues_viac = function(body, regionDetails) {
// viac forecasts three days at a time
var aviLevels = [];
for (var i = 0; i < 3; i++) {
aviLevels[i] = forecasts.AVI_LEVEL_UNKNOWN;
}
// NOTE typical string for viac:
//
//<h2>Wednesday February 19, 2020</h2>
// <div class="danger-ratings columns">
// <div class="column">
// <danger-rating :alpine="2" :treeline="1" :below="1">Wednesday February 19, 2020</danger-rating>
// </div>
// <div class="column">
// <danger-rating :alpine="2" :treeline="1" :below="1">Thursday February 20, 2020</danger-rating>
// </div>
// <div class="column">
// <danger-rating :alpine="2" :treeline="1" :below="1">Friday February 21, 2020</danger-rating>
// </div>
// </div>
var dangerRatingMatch = body.match(/<td.*Alpine<\/strong><\/td>\s*\n(\s*<td.*<\/td>\s*\n)(\s*<td.*<\/td>\s*\n)(\s*<td.*<\/td>\s*\n)/i);
// the capture groups will be in slots 1, 2, 3
if (dangerRatingMatch && dangerRatingMatch.length === 4) {
for (var j = 0; j < aviLevels.length; j++) {
aviLevels[j] = forecasts.findHighestAviLevelInString(dangerRatingMatch[j+1]);
}
} else {
winston.warn('parse failure, danger levels not found; regionId: ' + regionDetails.regionId);
}
return aviLevels;
};
forecasts.parseForecast_sac = function(body, regionDetails) {
var forecast = null;
var parser = new xml2js.Parser(xml2js.defaults['0.1']);
// NOTE this block is called synchronously with parsing, even though it looks async
parser.parseString(body, function(err, result) {
try {