public string Remove(Notification input, ILambdaContext context)
{
var region = RegionEndpoint.APSoutheast1;
var topicId = input.TopicId;
//Get item from DynamoDB
var key = new Dictionary <string, AttributeValue>();
key.Add("id", new AttributeValue()
{
S = topicId
});
var dynamoDBClient = new AmazonDynamoDBClient(region);
var getItemResponse = dynamoDBClient.GetItemAsync("Topics", key).Result;
if (getItemResponse.HttpStatusCode != HttpStatusCode.OK)
{
throw new TestDonkeyException("Can't find item");
}
var item = getItemResponse.Item;
var topicArn = item.GetValueOrDefault("arn").S;
//Remove permission to accept CloudWatch Events trigger for Lambda
var lambdaClient = new AmazonLambdaClient(region);
var removePermissionRequest = new Amazon.Lambda.Model.RemovePermissionRequest();
removePermissionRequest.FunctionName = "TestDonkeyLambda";
removePermissionRequest.StatementId = $"testdonkey-lambda-{ topicId }";
var removePermissionResponse = lambdaClient.RemovePermissionAsync(removePermissionRequest).Result;
if (removePermissionResponse.HttpStatusCode != HttpStatusCode.NoContent)
{
throw new TestDonkeyException("Can't remove permission");
}
//Remove target for CloudWatch Events
var cloudWatchEventClient = new AmazonCloudWatchEventsClient(region);
var removeTargetsRequest = new RemoveTargetsRequest();
removeTargetsRequest.Ids = new List <string> {
$"testdonkey-target-{ topicId }"
};
removeTargetsRequest.Rule = $"testdonkey-rule-{ topicId }";
var removeTargetsResponse = cloudWatchEventClient.RemoveTargetsAsync(removeTargetsRequest).Result;
if (removeTargetsResponse.HttpStatusCode != HttpStatusCode.OK)
{
throw new TestDonkeyException("Can't remove target");
}
//Delete rule in CloudWatch Events
var deleteRuleRequest = new DeleteRuleRequest();
deleteRuleRequest.Name = removeTargetsRequest.Rule;
var deleteRuleResponse = cloudWatchEventClient.DeleteRuleAsync(deleteRuleRequest).Result;
if (deleteRuleResponse.HttpStatusCode != HttpStatusCode.OK)
{
throw new TestDonkeyException("Can't delete rule");
}
//Remove subscribers from SNS
var snsClient = new AmazonSimpleNotificationServiceClient(region);
var listSubscriptionsByTopicRequest = new ListSubscriptionsByTopicRequest();
listSubscriptionsByTopicRequest.TopicArn = topicArn;
ListSubscriptionsByTopicResponse listSubscriptionsByTopicResponse = null;
do
{
listSubscriptionsByTopicResponse = snsClient.ListSubscriptionsByTopicAsync(listSubscriptionsByTopicRequest).Result;
if (listSubscriptionsByTopicResponse.HttpStatusCode != HttpStatusCode.OK)
{
throw new TestDonkeyException("Can't list subscriptions");
}
if (listSubscriptionsByTopicResponse.Subscriptions != null && listSubscriptionsByTopicResponse.Subscriptions.Count > 0)
{
foreach (var subscription in listSubscriptionsByTopicResponse.Subscriptions)
{
if (!subscription.SubscriptionArn.Equals("pendingconfirmation", StringComparison.OrdinalIgnoreCase))
{
snsClient.UnsubscribeAsync(subscription.SubscriptionArn).GetAwaiter().GetResult();
}
}
}
listSubscriptionsByTopicRequest.NextToken = listSubscriptionsByTopicResponse.NextToken;
Thread.Sleep(1_000); //Wait for 1 second. Throttle: 100 transactions per second (TPS)
} while (!string.IsNullOrWhiteSpace(listSubscriptionsByTopicResponse.NextToken));
//Delete topic from SNS
var deleteTopicResponse = snsClient.DeleteTopicAsync(topicArn).Result;
if (deleteTopicResponse.HttpStatusCode != HttpStatusCode.OK)
{
throw new TestDonkeyException("Can't delete topic");
}
//Delete item from DynamoDB
var dynamoDBDeleteItemResponse = dynamoDBClient.DeleteItemAsync("Topics", key).Result;
if (dynamoDBDeleteItemResponse.HttpStatusCode != HttpStatusCode.OK)
{
throw new TestDonkeyException("Can't delete item");
}
return("success");
}
