Serverless framework is not deploying an API Gateway on AWS from configuration

Question

I'm trying to use the Serverless framework to create a Lambda which is invoked when a client connects to a websocket API Gateway. AWS CloudFormation is creating the Lambda functions that are defined but the websocket API Gateway isn't being created.

After attempting to write my own (which didn't work) I resorted to copy and pasting the examples I've found on Serverless docs into a freshly created serverless folder just to see if it would work - it didn't, and I can't find anyone else who seems to have had a similar problem.

So far I've tried the simple and extended methods documented here (which is what the example code is based on): https://serverless.com/framework/docs/providers/aws/events/websocket/

And I've also tried to follow this blog, which also resulted in the Lambda creation but not an API Gateway. https://serverless.com/blog/api-gateway-websockets-example/

Here's my serverless.yml file. It deploys as I would expect, apart from the API Gateway:

service: temp
provider:
  name: aws
  runtime: nodejs8.10
  region: eu-west-2

functions:
  default:
    handler: handler.connect
    events:
      - websocket: 
        route: $default

Here is the serverless deploy -v output:

$ serverless deploy -v
Serverless: Packaging service...
Serverless: Excluding development dependencies...
Serverless: Creating Stack...
Serverless: Checking Stack create progress...
CloudFormation - CREATE_IN_PROGRESS - AWS::CloudFormation::Stack - temp-dev
CloudFormation - CREATE_IN_PROGRESS - AWS::S3::Bucket - ServerlessDeploymentBucket
CloudFormation - CREATE_IN_PROGRESS - AWS::S3::Bucket - ServerlessDeploymentBucket
CloudFormation - CREATE_COMPLETE - AWS::S3::Bucket - ServerlessDeploymentBucket
CloudFormation - CREATE_COMPLETE - AWS::CloudFormation::Stack - temp-dev
Serverless: Stack create finished...
Serverless: Uploading CloudFormation file to S3...
Serverless: Uploading artifacts...
Serverless: Uploading service .zip file to S3 (386 B)...
Serverless: Validating template...
Serverless: Updating Stack...
Serverless: Checking Stack update progress...
CloudFormation - UPDATE_IN_PROGRESS - AWS::CloudFormation::Stack - temp-dev
CloudFormation - CREATE_IN_PROGRESS - AWS::Logs::LogGroup - DefaultLogGroup
CloudFormation - CREATE_IN_PROGRESS - AWS::IAM::Role - IamRoleLambdaExecution
CloudFormation - CREATE_IN_PROGRESS - AWS::Logs::LogGroup - DefaultLogGroup
CloudFormation - CREATE_COMPLETE - AWS::Logs::LogGroup - DefaultLogGroup
CloudFormation - CREATE_IN_PROGRESS - AWS::IAM::Role - IamRoleLambdaExecution
CloudFormation - CREATE_COMPLETE - AWS::IAM::Role - IamRoleLambdaExecution
CloudFormation - CREATE_IN_PROGRESS - AWS::Lambda::Function - DefaultLambdaFunction
CloudFormation - CREATE_IN_PROGRESS - AWS::Lambda::Function - DefaultLambdaFunction
CloudFormation - CREATE_COMPLETE - AWS::Lambda::Function - DefaultLambdaFunction
CloudFormation - CREATE_IN_PROGRESS - AWS::Lambda::Version - DefaultLambdaVersionY0DDREbM8apFqgW7p0WqFe2SjYB4Wt7O63fYPiljU
CloudFormation - CREATE_IN_PROGRESS - AWS::Lambda::Version - DefaultLambdaVersionY0DDREbM8apFqgW7p0WqFe2SjYB4Wt7O63fYPiljU
CloudFormation - CREATE_COMPLETE - AWS::Lambda::Version - DefaultLambdaVersionY0DDREbM8apFqgW7p0WqFe2SjYB4Wt7O63fYPiljU
CloudFormation - UPDATE_COMPLETE_CLEANUP_IN_PROGRESS - AWS::CloudFormation::Stack - temp-dev
CloudFormation - UPDATE_COMPLETE - AWS::CloudFormation::Stack - temp-dev
Serverless: Stack update finished...
Service Information
service: temp
stage: dev
region: eu-west-2
stack: temp-dev
api keys:
  None
endpoints:
  None
functions:
  default: temp-dev-default
layers:
  None

Stack Outputs
DefaultLambdaFunctionQualifiedArn: arn:aws:lambda:eu-west-2:[redacted]:function:temp-dev-default:3
ServerlessDeploymentBucketName: temp-dev-serverlessdeploymentbucket-[redacted]

If anyone can shed some light on this as I may be completely missing something obvious, I'd be grateful.

Do you get any error when deploying ? Have you tried serverless deploy --verbose to see if you can get more hints ? What exactly is wrong with the deployment ? Nothing is created in API gateway ? — Hugo
– Hugo, Commented Apr 24, 2019 at 23:59
@Hugo I don't get any errors. It fails silently. I've just added the output of serverless deploy -v to the question. Yes, nothing is created in API Gateway like you would expect. — James-Prescott
– James-Prescott, Commented Apr 25, 2019 at 10:07

RLU · Accepted Answer · 2019-10-06 06:56:23Z

7

I had the exact same issue and for me the solution was to indent route properly like this:

functions:
  default:
    handler: handler.connect
    events:
      - websocket: 
          route: $default

So basically change:

- websocket: 
  route: $default

to:

- websocket: 
    route: $default

answered Oct 6, 2019 at 6:56

RLU

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1 Comment

Gandalf Over a year ago

Oh wow, I had this exact same issue. There was no warning output from severless deploy and the difference is quite subtle as the dash before the parent makes things look indented at a glance

James-Prescott · Accepted Answer · 2019-04-25 12:56:34Z

After going through literally everything related to Serverless I realised my Serverless version is not the most recent one (don't ask me how that happened, I ran yarn add serverless to get a project specific version of it yesterday)

Instead, the version was 1.35 and thus had no support for API Gateway websockets. Perhaps I had installed it globally at a previous point and neglected to remove it from my global npm packages...

The fact it was failing to recognise the tags silently did not help the debugging process and I might - when I get chance - contribute to the project by adding a validation run on the Serverless.yml files so unsupported options are flagged in the console.

As it was, running npm install -g serverless@latest fixed the problem and now the API Gateway gets deployed correctly.

Thank you Alex and Hugo for responding!

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