DynamoDB stream filterPatterns

[0xazuki7]

Are you certain it's a bug?

• Yes, it looks like a bug

Is the issue caused by a plugin?

• It is not a plugin issue

Are you using the latest v3 release?

• Yes, I'm using the latest v3 release

Is there an existing issue for this?

• I have searched existing issues, it hasn't been reported yet

Issue description

schema validator reports that lambda events DynamoDB stream filterPatterns must be an array which I think is not correct as when filterPatterns is an array the filter must match one of patterns but when it is an object it must match each pattern

example with an array:

functions:
  myLambda:
    handler: src/handlers/myLambda.default
    events:
      - stream:
          arn: arn:aws:dynamodb:region:XXXXXX:table/Test/stream/1970-01-01T00:00:00.000
          batchSize: 5
          filterPatterns:
           - eventName: INSERT
           - dynamodb:
                NewImage:
                  Type:
                    S: [Invoice]

in this case if eventName == "INSERT" OR record's (item).Type == "Invoice" the record is accepted

example with a key-value object:

functions:
  myLambda:
    handler: src/handlers/myLambda.default
    events:
      - stream:
          arn: arn:aws:dynamodb:region:XXXXXX:table/Test/stream/1970-01-01T00:00:00.000
          batchSize: 5
          filterPatterns:
           eventName: INSERT
           dynamodb:
                NewImage:
                  Type:
                    S: [Invoice]

in this case if eventName == "INSERT" AND record's (item).Type == "Invoice" then the record is accepted

maybe I'm wrong and there's already another method to declare "AND" type filters ?

Service configuration (serverless.yml) content

service: sls-project

frameworkVersion: "3"

package:
  individually: true

provider:
  name: aws
  runtime: nodejs18.x
  versionFunctions: false
  region: eu-west-3
  deploymentMethod: direct
functions:
  myLambda:
    handler: src/handlers/myLambda.default
    events:
      - stream:
          arn: arn:aws:dynamodb:region:XXXXXX:table/Test/stream/1970-01-01T00:00:00.000
          batchSize: 5
          filterPatterns:
            eventName: INSERT
            dynamodb:
                NewImage:
                  Type:
                    S: [Invoice]

Command name and used flags

any sls command

Command output

Warning: Invalid configuration encountered
  at 'functions.myLambda.events.0.stream.filterPatterns': must be array

Learn more about configuration validation here: http://slss.io/configuration-validation

Environment information

Running "serverless" from node_modules
Framework Core: 3.26.0 (local) 3.26.0 (global)
Plugin: 6.2.2
SDK: 4.3.2

[0xk0nf]

I think filterPaterns structure is wrong.

filterPatterns:
            eventName: INSERT
            dynamodb:
                NewImage:
                  Type:
                    S: [Invoice]

Instead of this, please try to use something like this:

- {
      eventName: ...
      dynamodb: ...
  }

[0xazuki7]

Okay, I changed to this:

- {
       eventName: INSERT,
       dynamodb: { NewImage: { Type: { S: [Invoice] } } },
}

[0xazuki7]

And now I get this output without error:

 "FilterCriteria": {
    "Filters": [
        {
            "Pattern": "{\"eventName\":\"INSERT\",\"dynamodb\":{\"NewImage\":{\"Type\":{\"S\":[\"Invoice\"]}}}}"
        }
    ]
}

Thanks!