private static NodePool CreateNodePool()

in src/Elastic.Extensions.Logging/ElasticsearchLoggerProvider.cs [99:142]
40 lines of code
15 McCabe index (conditional complexity)

		private static NodePool CreateNodePool(ElasticsearchLoggerOptions loggerOptions)
		{
			var shipTo = loggerOptions.ShipTo;
			var connectionPool = loggerOptions.ShipTo.NodePoolType;
			var nodeUris = loggerOptions.ShipTo.NodeUris?.ToArray() ?? Array.Empty<Uri>();
			if (nodeUris.Length == 0 && connectionPool != NodePoolType.Cloud)
				return new SingleNodePool(new Uri("http://localhost:9200"));
			if (connectionPool == NodePoolType.SingleNode || connectionPool == NodePoolType.Unknown && nodeUris.Length == 1)
				return new SingleNodePool(nodeUris[0]);

			switch (connectionPool)
			{
				// TODO: Add option to randomize pool
				case NodePoolType.Unknown:
				case NodePoolType.Sniffing:
					return new SniffingNodePool(nodeUris);
				case NodePoolType.Static:
					return new StaticNodePool(nodeUris);
				case NodePoolType.Sticky:
					return new StickyNodePool(nodeUris);
				// case NodePoolType.StickySniffing:
				case NodePoolType.Cloud:
					if (shipTo.CloudId.IsNullOrEmpty())
						throw new Exception($"Cloud {nameof(CloudNodePool)} requires '{nameof(ShipToOptions.CloudId)}' to be provided as well");

					if (!shipTo.ApiKey.IsNullOrEmpty())
					{
						var apiKeyCredentials = new ApiKey(shipTo.ApiKey);
						return new CloudNodePool(shipTo.CloudId, apiKeyCredentials);
					}
					if (!shipTo.Username.IsNullOrEmpty() && !shipTo.Password.IsNullOrEmpty())
					{
						var basicAuthCredentials = new BasicAuthentication(shipTo.Username, shipTo.Password);
						return new CloudNodePool(shipTo.CloudId, basicAuthCredentials);
					}
					throw new Exception(
						$"Cloud requires either '{nameof(ShipToOptions.ApiKey)}' or"
						+ $"'{nameof(ShipToOptions.Username)}' and '{nameof(ShipToOptions.Password)}"
					);
				default:
					throw new ArgumentException($"Unrecognised connection pool type '{connectionPool}' specified in the configuration.",
						nameof(connectionPool));
			}
		}