Serverless one lambda triggered by multiple s3 buckets

Question

In my Serverless YAML file I defined a lambda function with multiple S3 events from different buckets, already existing, such as below

functions:
  my-lambda:
    handler: ...
    name: my-lambda
    description: 'Fetcher'
    environment:
      env_host: aws
    events:
      - s3:
          bucket: bucket1
          existing: true
      - s3:
          bucket: bucket2
          existing: true

The command “serverless deploy” fails with below text:

Only one S3 Bucket can be configured per function. In “my-lambda" you're attempting to configure "bucket1" and "bucket2" at the same time.

Is it possible to configure one lambda with multiple s3 buckets in Serverless?

yvesonline · Accepted Answer · 2021-03-12 12:39:27Z

1

Unfortunately no.

From the Serverless doc:

IMPORTANT: You can only attach 1 existing S3 bucket per function.

AWS Lambda allows only one Amazon S3 bucket as an event source. You can define s3 multiple times in events with a different event type but it still must be from the same bucket, see here.

You can though use the handler you wrote multiple times to define multiple functions like this:

functions:
  my-lambda-bucket1:
    handler: ...
    name: my-lambda-bucket1
    description: 'Fetcher with bucket1'
    environment:
      env_host: aws
    events:
      - s3:
          bucket: bucket1
          existing: true
  my-lambda-bucket2:
    handler: ...
    name: my-lambda-bucket2
    description: 'Fetcher with bucket2'
    environment:
      env_host: aws
    events:
      - s3:
          bucket: bucket2
          existing: true

answered Mar 12, 2021 at 12:39

yvesonline

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3 Comments

Premier Over a year ago

I see, there is a bug in Serverless. Fixed in the same way, splitting events.

yvesonline Over a year ago

Oh so you can actually note down two different buckets when the events are different?

Premier Over a year ago

Yes, since you are deploying 2 functions with same app

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