Modified CodePipeline to use CloudWatch event trigger

Author: Prakash

Diff for: automated-ui-testing.yaml

@@ -460,6 +460,55 @@ Resources:
                 Resource:
                   - Fn::Sub: arn:aws:sns:${AWS::Region}:${AWS::AccountId}:${ApprovalTopic}
 
+  AmazonCloudWatchEventRole:
+    Type: AWS::IAM::Role
+    Properties:
+      AssumeRolePolicyDocument:
+        Version: "2012-10-17"
+        Statement:
+          -
+            Effect: Allow
+            Principal:
+              Service:
+                - events.amazonaws.com
+            Action: sts:AssumeRole
+      Path: /
+      Policies:
+        -
+          PolicyName: cwe-pipeline-execution
+          PolicyDocument:
+            Version: "2012-10-17"
+            Statement:
+              -
+                Effect: Allow
+                Action: codepipeline:StartPipelineExecution
+                Resource: !Join [ '', [ 'arn:aws:codepipeline:', !Ref 'AWS::Region', ':', !Ref 'AWS::AccountId', ':', !Ref AutomatedUITestPipeline ] ]
+
+  AmazonCloudWatchEventRule:
+    Type: AWS::Events::Rule
+    Properties:
+      EventPattern:
+        source:
+          - aws.codecommit
+        detail-type:
+          - 'CodeCommit Repository State Change'
+        resources:
+          - !Join [ '', [ 'arn:aws:codecommit:', !Ref 'AWS::Region', ':', !Ref 'AWS::AccountId', ':', !Ref SourceRepo ] ]
+        detail:
+          event:
+            - referenceCreated
+            - referenceUpdated
+          referenceType:
+            - branch
+          referenceName:
+            - master
+      Targets:
+        -
+          Arn: 
+            !Join [ '', [ 'arn:aws:codepipeline:', !Ref 'AWS::Region', ':', !Ref 'AWS::AccountId', ':', !Ref AutomatedUITestPipeline ] ]
+          RoleArn: !GetAtt AmazonCloudWatchEventRole.Arn
+          Id: codepipeline-AutomatedUITestPipeline
+
   TestChromeProject:
     Type: AWS::CodeBuild::Project
     Properties:
@@ -816,6 +865,7 @@ Resources:
                 -
                   Name: UITestSourceOutput
               Configuration:
+                PollForSourceChanges: False
                 BranchName: master
                 RepositoryName:
                   Ref: SourceRepo