/// <summary>
/// Get or Create Region.
/// </summary>
/// <param name="region">Region name.</param>
/// <returns>Instance of <see cref="FailoverRegion{RegionEndpoint}"/></returns>
private FailoverRegion <RegionEndpoint> GetOrCreateRegion(string region)
{
// If exists
if (_failoverRegions.TryGetValue(region, out var failoverRegion))
{
return(failoverRegion);
}
// If does not exists, create and store
failoverRegion = new FailoverRegion <RegionEndpoint>(RegionEndpoint.GetBySystemName(region),
_regionResetWindowInMillis);
_failoverRegions.Add(region, failoverRegion);
return(failoverRegion);
}
/// <summary>
/// Setup region and create client.
/// </summary>
/// <param name="credentials">Instance of <see cref="AWSCredentials"/> class.</param>
/// <param name="regionEndpoint">Instance of <see cref="RegionEndpoint"/> class.</param>
/// <param name="failover">Fail over to the new region.</param>
/// <param name="freeCurrentRegion">Mark current region as free.</param>
/// <returns>Instance of <see cref="AmazonServiceClient"/> class</returns>
protected virtual TAWSClient GetOrCreateRegionClient(AWSCredentials credentials, RegionEndpoint regionEndpoint, bool failover = true, bool freeCurrentRegion = false)
{
var failoverRegion = GetOrCreateRegion(regionEndpoint);
_logger.LogDebug("Creating client for AWS region: {0}", regionEndpoint.SystemName);
// Check Failover Region is available
if (failoverRegion.Available())
{
if (failover)
{
// Mark in use
failoverRegion.MarkInUse();
// Mark current region free
if (freeCurrentRegion && _currentRegion is not null)
{
_currentRegion.Reset();
}
// Mark current region as down
else if (_currentRegion is not null)
{
_currentRegion.MarkIsDown();
}
// Store as current region
_currentRegion = failoverRegion;
}
_logger.LogInformation("Successfully created client for AWS region: {0}.", regionEndpoint.SystemName);
return(_createClient(_context, credentials, failoverRegion.Region));
}
else
{
_logger.LogDebug("Skipped creating client for AWS region: {0}, currently in use or region is down.", regionEndpoint.SystemName);
}
return(null);
}
