public Task AppendToCacheAsync(Int64 geohash, BingResult bingResult)
{
if (_precision <= 0)
{
throw new ArgumentException("Precision must be greater than 0");
}
_cache.Add(geohash, bingResult);
return(Task.CompletedTask);
}
public async Task <MessageHandlerResults> ProcessMessageAsync(Message msg, string pipelineName, int idx)
{
//TODO: Replace all console logging of exceptions to generic log solution
double lat;
double lon;
//TODO: Catch more specific error if property doesn't exist or use another method to get the properties
try
{
lat = double.Parse(msg.Properties[_latProperty]);
lon = double.Parse(msg.Properties[_lonProperty]);
}
catch (Exception)
{
Console.WriteLine($"Unable to find required properties: '{_latProperty}' and '{_lonProperty}' on message");
return(MessageHandlerResults.FailStopProcessing);
}
var geoHash = GeoHash.EncodeInt(lat, lon, _geoHashCacheProvider.Precision);
BingResult bingParsingResult;
//if we have the result in the cache, fetch it
if (await _geoHashCacheProvider.ContainsGeoHashAsync(geoHash))
{
bingParsingResult = await _geoHashCacheProvider.GetAsync(geoHash);
Debug.WriteLine("Found in cache");
}
//else, query bing directly
else
{
Debug.WriteLine("Not found in cache");
double geoHashCenterLat, geoHashCenterLon;
//get the center of the geoHash in order to call Bing API with this {lat,lon}
var decodedGeoHash = GeoHash.DecodeInt(geoHash, _geoHashCacheProvider.Precision);
geoHashCenterLat = decodedGeoHash.Coordinates.Lat;
geoHashCenterLon = decodedGeoHash.Coordinates.Lon;
var bingUrl = $"http://dev.virtualearth.net/REST/v1/Locations/{geoHashCenterLat},{geoHashCenterLon}?key={_bingMapsKey}";
string bingResult;
try
{
var client = new HttpClient();
bingResult = await client.GetStringAsync(bingUrl);
}
catch (Exception ex)
{
Console.WriteLine("An exception occurred while calling Bing to Lookup coordinates");
Console.WriteLine(ex);
return(MessageHandlerResults.FailStopProcessing);
}
try
{
var json = JObject.Parse(bingResult);
var address = json["resourceSets"][0]["resources"][0]["address"];
//create a bing parsing result instance and cache it
bingParsingResult = new BingResult()
{
City = (string)address["locality"], Country = (string)address["countryRegion"], District = (string)address["adminDistrict"]
};
await _geoHashCacheProvider.AppendToCacheAsync(geoHash, bingParsingResult);
}
catch (Exception ex)
{
Console.WriteLine("An exception occurred while trying to parse Location Lookup results from Bing");
Console.WriteLine(ex);
return(MessageHandlerResults.FailStopProcessing);
}
}
//add values to msg
msg.Properties.Add("country", bingParsingResult.Country);
msg.Properties.Add("district", bingParsingResult.District);
msg.Properties.Add("city", bingParsingResult.City);
return(MessageHandlerResults.Success);
}