CODEWITHSUNDEEP
aws-serverless
Alex R
Alex R

Reputation: 11881

AWS SAM Template - Error: Failed to parse template: while parsing a block mapping

I have this template:

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: >
  example

Parameters:
  EnvironmentPrefix:
    Type: String
    Default: "test-"

Resources:
  S3JsonLoggerFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: src/handlers/s3-json-logger.s3JsonLoggerHandler
      Runtime: nodejs18.x
      Architectures:
        - x86_64
      MemorySize: 128
      Timeout: 60
      Policies:
        - S3ReadPolicy:
            BucketName:
              !Fn::ImportValue:
                !Sub "${EnvironmentPrefix}example-bucket"
      Events:
        S3NewObjectEvent:
          Type: S3
          Properties:
            Bucket:
              !Fn::ImportValue:
                !Sub "${EnvironmentPrefix}example-bucket"
            Events: s3:ObjectCreated:*
            Filter:
              S3Key:
                Rules:
                  - Name: prefix
                    Value: "changelog/"

Why does it fail with this error???

Error: Failed to parse template: while parsing a block mapping
  in "<unicode string>", line 23, column 13:
                BucketName:
                ^
expected <block end>, but found '<tag>'
  in "<unicode string>", line 25, column 17:
                    !Sub "${EnvironmentPrefix}example-b ...
                    ^

I've been staring at this and comparing it to the examples at https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-policy-templates.html and can't figure out what's different!!!

Upvotes: 0

Views: 824

Answers (1)

Town
Town

Reputation: 14906

I think your syntax of !Fn::ImportValue: is wrong.

It should be just Fn::ImportValue: without the !, as ! is a short-form alias for Fn::.

Policies:
  - S3ReadPolicy:
     BucketName:
       Fn::ImportValue:
         !Sub "${EnvironmentPrefix}example-bucket"

Docs are here: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference-importvalue.html

Upvotes: 3

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