如何使用 aws-cdk for python 在一个 cloudwatch 图中获取多个 lambda

Question

I am using python in aws-cdk to create some graphs, alerts, sns topics etc.

My goal is to create a graph that takes a lambda metric for example "Errors" from all lambdas existing in some aws console space

So far I've found examples defining a single lambda from a local path as function, like:

lambdaFunction = _lambda.Function(
        self,
        id='someLambda',
        runtime=_lambda.Runtime.PYTHON_3_8,
        'handler='medium.handler',
        code=_lambda.Code.from_asset(path='src'),
        )

My question is: Is it possible to define all lambdas from aws console to later put them in a graph? Is something like this possible?

errors_widget = aws_cloudwatch.GraphWidget(title= "Errors",
    left=[all_lambdas_function.metric_errors()],
    width=24)

Answer 1

Yes, you can reference existing AWS resources, such as lambdas defined in the console, in your CDK app.

First, get a CDK reference to your lambda with the from the from_function_arn classmethod on Lambda.Function . You give it the function ARN and it returns an IFunction type.

arn = "arn:aws:lambda:eu-west-1:<MYACCOUNT>:function:my-existing-great-function"
my_existing_lambda: IFunction = _lambda.Function.from_function_arn(self, "ExistingLambdaFunction", arn)

From then on, you can call IFunction's methods to add things like metric_errors on my_existing_lambda .