How to define CF resource as function event source in serverless framework - serverless-framework

Question

I'm trying to create a AWS Lambda with the serverless framework. The Lambda is triggered through an AWS IoT Topic Rule. In case the execution of the Rule fails I want to have an error action executed. The entire configuration should take place within the serverless.yml.
As far as I can tell from the documentation there is no option to describe an errorAction for an iot event:
functions:
foobar:
events:
- iot:
errorAction: ?
It is possible though to define a Cloud Formation resource with an ErrorAction inside the serverless.yml:
resources:
Resources:
FoobarIotTopicRule1:
Type: AWS::IoT::TopicRule
Properties:
ErrorAction:
Republish:
RoleArn: arn:aws:iam::1234567890:role/service-role/iot_execution_role
Topic: FAILURE
But then I don't know how to link the resource to act as a trigger of the Lambda function.
functions:
foobar:
handler: index.handler
events:
- iot:
name: iot_magic_rule
sql: "SELECT * FROM 'my/dedicated/topic'"
enabled: true
sqlVersion: '2016-03-23'
resources:
Resources:
FoobarIotTopicRule1:
Type: AWS::IoT::TopicRule
Properties:
RuleName: iot_magic_rule
TopicRulePayload:
AwsIotSqlVersion: '2016-03-23'
RuleDisabled: false
Sql: "SELECT * FROM 'my/dedicated/topic'"
ErrorAction:
Republish:
RoleArn: arn:aws:iam::1234567890:role/service-role/iot_execution_role
Topic: FAILURE
With the above configuration, trying to deploy on AWS fails as Cloud Formation tries to create the AWS IoT Topic Rule twice. Once for the definition in events and once as the defined resource FoobarIoTTopicRule1.
EDIT1
Defining the Lambda action inside the IoTTopicRule resource, creates the rule as intended, with Lambda action and error event. Unfortunately the rule does not show up as a trigger within the Lambda.

Answer 1

To be able to define an AWS IoT Topic Rule with an ErrorAction that will also show up as a trigger event on AWS Lambda, the configuration should look somewhat like this:
functions:
foobar:
handler: index.handler
resources:
Resources:
FoobarIotTopicRule1:
Type: AWS::IoT::TopicRule
Properties:
RuleName: iot_magic_rule
TopicRulePayload:
AwsIotSqlVersion: '2016-03-23'
RuleDisabled: false
Sql: "SELECT * FROM 'my/dedicated/topic'"
Actions:
- Lambda:
FunctionArn: { "Fn::GetAtt": ['FoobarLambdaFunction', 'Arn']}
ErrorAction:
Republish:
RoleArn: arn:aws:iam::1234567890:role/service-role/iot_execution_role
Topic: FAILURE
FoobarLambdaPermissionIotTopicRule1:
Type: AWS::Lambda::Permission
Properties:
FunctionName: { "Fn::GetAtt": [ "FoobarLambdaFunction", "Arn" ] }
Action: lambda:InvokeFunction
Principal: { "Fn::Join": ["", [ "iot.", { "Ref": "AWS::URLSuffix" } ]]}
SourceArn:
Fn::Join:
- ""
- - "arn:"
- "Ref": "AWS::Partition"
- ":iot:"
- "Ref": "AWS::Region"
- ":"
- "Ref": "AWS::AccountId"
- ":rule/"
- "Ref": "FoobarIotTopicRule1"