public async Task <string> AsyncExecute(System.IO.Stream input, ILambdaContext context)
{
_ = input; // discard
var waqiProxy = Waqi.create(_token);
var cities = JsonSerializer.Deserialize <List <Latincoder.AirQuality.Model.Config.City> >(_citiesRaw); // default C# serialization
// process multiple cities
var stationFeedsByCity = from city in cities
from station in city.Stations
let feed = new { Uri = $"{city.Country}/{city.Name}/{station}", CityName = city.Name }
group feed by $"{city.Country}-{city.Name}" into stationsByCity
select stationsByCity;
var cityFeedsDTO = new List <CityFeed>();
foreach (var cityFeeds in stationFeedsByCity)
{
var feeds = from value in cityFeeds
select value.Uri;
var stationFeedsObtained = new List <WaqiCityFeed>();
foreach (var feed in feeds)
{
System.Console.WriteLine($"Requesting feed for:{feed}");
string mutableString = string.Empty;
try {
mutableString = await waqiProxy.getCityFeed(feed);
if (mutableString != string.Empty)
{
System.Console.WriteLine("found this result:\n");
System.Console.WriteLine(mutableString);
var wcf = JsonSerializer.Deserialize <WaqiCityFeed>(mutableString);
stationFeedsObtained.Add(wcf);
}
} catch (Exception e) { System.Console.WriteLine(e); }
}
try {
cityFeedsDTO.Add(CityFeed.From(stationFeedsObtained));
} catch (Exception e) { System.Console.WriteLine(e); }
}
var aqiTable = Table.LoadTable(_dynamoClient, _AqiTableName);
var notificationIsUrgent = NotificationValidator.CreateyValidator();
notificationIsUrgent.AddRules(Rules.AqiAboveUnhealthyThreshold);
// store in DynamoDB if meets notification criteria
foreach (var feed in cityFeedsDTO)
{
// Gather previous and new feeds
var prevFeedDoc = await aqiTable.GetItemAsync(CityFeedDocument.PartitionKeyName);
var newFeed = prevFeedDoc != null?
CityFeedDocument.From(feed, prevFeedDoc[CityFeedDocument.FieldMaxAqi].AsInt()) :
CityFeedDocument.From(feed);
// if no previous stuff
if (prevFeedDoc == null)
{
Console.WriteLine($"FIRST TIME: Store in dynamo now for {feed.CityName}");
await aqiTable.PutItemAsync(newFeed);
continue;
}
var prevFeed = CityFeedDocument.ToDTO(prevFeedDoc);
// each feed will has a custom validator with it's own criteria since this is done per city
var notificationIsNotSpam = NotificationValidator.CreateyValidator();
// spam means max aqi changed at least by 5 points, and is at least 20 minutes apart frm last notification
notificationIsNotSpam.AddRules(
Rules.MinutesApartFrom(prevFeed, 30),
Rules.AbsoluteAqiChangedBy(prevFeed, 5));
// urgent or meets criteria
if (notificationIsUrgent.MeetsGlobalCriteria(feed) && notificationIsNotSpam.MeetsGlobalCriteria(feed))
{
Console.WriteLine($"Store in dynamo now for {feed.CityName}");
await aqiTable.PutItemAsync(newFeed);
}
else
{
Console.WriteLine("Does not meet rules...");
}
}
return("done");
}