private static async Task <ThermostatData> ExecuteGetThermostatDataAsync(Stream inputBlob, string deviceId, TraceWriter log, ExecutionContext context)
{
var requireNewReading = true;
IConfigurationRoot configurationRoot = ReadConfiguration(context);
// Using an In-Memory cache to avoid throttling the API
//// TODO: Resolve possible racing conditions
if (latestReading != null && latestReadingTimestamp != null)
{
var cacheTimeout = DefaultCacheTimeout;
if (int.TryParse(configurationRoot["ThermostatDataCacheTimeoutMs"], out int cacheTimeoutOverride))
{
cacheTimeout = cacheTimeoutOverride;
}
var newTimestamp = DateTime.UtcNow.AddMilliseconds(-cacheTimeout);
if (newTimestamp < latestReadingTimestamp)
{
requireNewReading = false;
}
}
if (requireNewReading)
{
log.Info("Obtaining a new Reading from Nest");
var result = await GetThermostatData(inputBlob, deviceId, log, configurationRoot);
latestReadingTimestamp = DateTime.UtcNow;
latestReading = result;
}
return(latestReading);
}
/// <summary>
/// Helper method to convert a <see cref="ThermostatData"/> instance
/// to a <see cref="ThermostatInfo"/> instance.
/// </summary>
/// <param name="data">The data instance.</param>
/// <returns>The converted data.</returns>
public static ThermostatInfo ToThermostatInfo(this ThermostatData data)
{
return(new ThermostatInfo()
{
Uuid = data?.Uuid,
Link = data?.Link,
Name = data?.Name
});
}
/// <summary>
/// Helper method to copy data from a <see cref="ThermostatData"/>
/// to a <see cref="ThermostatInfo"/> instance.
/// </summary>
/// <param name="info">The full data instance.</param>
/// <param name="data">The data instance.</param>
public static void CopyFrom(this ThermostatInfo info, ThermostatData data)
{
info.Link = data?.Link;
info.Name = data?.Name;
}
