Feature: Always deploy API option

[keetonian]

Description:

Add a new property to always deploy your API even if we can't detect a change to the API.

Steps to reproduce the issue:

1. Deploy a SAM template with an API that references a function
2. Change the name of the function
3. Redeploy the template

Observed result:

The rest API does not redeploy with the updated function name

Expected result:

Rest API would redeploy with the updated function name

See issue #634

[jlhood]

Another edge case where a customer encountered an availability drop by a missed API deployment:

In your case, from the name of your functions, I'm guessing you're explicitly hardcoding the function name using the FunctionName property. If you change the value of FunctionName without changing the logical id (key of the AWS::Serverless::Function resource), SAM will not detect that the API has changed and will not redeploy the API after it's been updated.

In this case, on deployment, CloudFormation creates a new function with the new name, updates the API Gateway REST definition to point to the new function name, does NOT do a deployment of this updated API definition (so the actual API is still referencing the function with the old name), then deletes the Lambda function with the old name (causing the API to now return 5xx errors).

[keetonian]

#1162 is another case that this would fix.

[jonathanyong81]

Has there been any progress on this?

For example if my swagger definition has an endpoint with the following

x-amazon-apigateway-integration:
  uri: !Sub "arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${LambdaFunction.Arn}:${FunctionAlias}/invocations"

When I update the lambda (so a new version of the lambda, with a new alias pointing to that version), SAM doesn't deploy the API. Although the API definition shows the endpoint integrated with the new lambda alias, the stage is NOT actually deployed.

To get around this, we would have to hardcode and increment the FunctionAlias in the swagger definition (so that SAM detects a swagger change) rather than using the variable.

[deepku2]

+1

[atharfaraz]

+1