public async static Task <CosmosAccountSettings> GetDatabaseAccountFromAnyLocationsAsync(
Uri defaultEndpoint, IList <string> locations, Func <Uri, Task <CosmosAccountSettings> > getDatabaseAccountFn)
{
try
{
CosmosAccountSettings databaseAccount = await getDatabaseAccountFn(defaultEndpoint);
return(databaseAccount);
}
catch (Exception e)
{
DefaultTrace.TraceInformation("Fail to reach global gateway {0}, {1}", defaultEndpoint, e.ToString());
if (locations.Count == 0)
{
throw;
}
}
for (int index = 0; index < locations.Count; index++)
{
try
{
CosmosAccountSettings databaseAccount = await getDatabaseAccountFn(LocationHelper.GetLocationEndpoint(defaultEndpoint, locations[index]));
return(databaseAccount);
}
catch (Exception e)
{
DefaultTrace.TraceInformation("Fail to reach location {0}, {1}", locations[index], e.ToString());
if (index == locations.Count - 1)
{
// if is the last one, throw exception
throw;
}
}
}
// we should never reach here. Make compiler happy
throw new Exception();
}
public static async Task <AccountProperties> GetDatabaseAccountFromAnyLocationsAsync(
Uri defaultEndpoint, IList <string> locations, Func <Uri, Task <AccountProperties> > getDatabaseAccountFn)
{
ExceptionDispatchInfo capturedException = null;
try
{
AccountProperties databaseAccount = await getDatabaseAccountFn(defaultEndpoint);
return(databaseAccount);
}
catch (Exception e)
{
DefaultTrace.TraceInformation("Fail to reach global gateway {0}, {1}", defaultEndpoint, e.ToString());
if (IsNonRetriableException(e))
{
DefaultTrace.TraceInformation("Exception is not retriable");
throw;
}
if (locations.Count == 0)
{
throw;
}
// Save the exception and rethrow it at the end after trying all regions
capturedException = ExceptionDispatchInfo.Capture(e);
}
for (int index = 0; index < locations.Count; index++)
{
try
{
AccountProperties databaseAccount = await getDatabaseAccountFn(LocationHelper.GetLocationEndpoint(defaultEndpoint, locations[index]));
return(databaseAccount);
}
catch (Exception e)
{
DefaultTrace.TraceInformation("Fail to reach location {0}, {1}", locations[index], e.ToString());
// if is the last region, throw exception
if (index == locations.Count - 1)
{
// The reason for rethrowing the first exception is that the locations list might contain invalid regions,
// so the last exception would be some generic exception ("The remote name could not be resolved") instead of the real exception.
// Location list containing invalid regions is quite common when SetCurrentLocation is used since it will add all Azure regions to the list
if (capturedException != null)
{
capturedException.Throw();
}
throw;
}
}
}
// we should never reach here. Make compiler happy
throw new Exception();
}
private Task TryGetAccountPropertiesFromRegionalEndpointsAsync(string location)
{
return(this.GetAndUpdateAccountPropertiesAsync(
LocationHelper.GetLocationEndpoint(this.DefaultEndpoint, location)));
}