Creating a lambda-backed custom resource in .NET CDK

[IgorPietraszko]

I have the following code that creates my lambda function, a provider and a custom resource.

Lambda function code is based on a custom construct so just providing it for reference:

var dbUpdaterFunction = new DbUpdaterLambdaContruct(this,
                "DbUpdaterLambda",
                new DbUpdaterLambdaContructProps
                {
                    SourceBuildsBucket = sourceBuildsBucket,
                    EnvironmentName = props.EnvironmentName.GetDescription(),
                    Vpc = VpcConstruct.Vpc,
                    BuildVersion = buildVersion,
                    LambdaZipFileName = "DbUpdater.zip"
                    DbClusterConnectable = dbClusterConnectable,
                    DbClusterPort = props.DbClusterPort,
                    VerifiedTenantDomainSESArns = props.VerifiedTenantDomainSESArns,
                    ErrorReportSnsTopicArn = topic.TopicArn,
                    LambdaTimeout = Duration.Seconds(60)
                })
                .Function;

then I create a provider:

            var provider = new Provider(this, "DbUpdatedCustomResourceProvider", new ProviderProps
            {
                OnEventHandler = dbUpdaterFunction,
                
            });

and lastly a custom resource:

           var customResource = new CustomResource(this, "DbUpdaterCustomResource", new CustomResourceProps
            {
                ServiceToken = provider.ServiceToken,
                Properties = new Dictionary<string, object>
                {
                    { "DbSecretArn", dbClusterSecret.SecretArn }
                }
            });

Now my function executed the first time I installed it and the related custom resource (CREATE EVENT). But, it is not invoked on subsequent events (UPDATE). Now my function has the same behaviour for CREATE and UPDATE and does nothing on DELETE but it does not even register as executing in Lambda CloudWatch after the initial install/create and I don't know why.

[indrora]

Custom resources (and any resource, in general) are not informed of UPDATE events unless they or a child/other dependency has changed.