问题描述
目前,我很难成功部署包含 3 个 lambda、API 网关和状态机的 CloudFormation 堆栈。我在尝试调试这个问题时不知所措,并且会喜欢第二组眼睛。部署在尝试构建 AWS::ApiGateway::Method
时失败并返回:
apiGatewayRootMethod: entered status CREATE_Failed,reason: Invalid ARN specified in the request (Service: AmazonApiGateway; Status Code: 400; Error Code: BadRequestException; Request ID: a2ba00f1-179b-400f-a42a-f3a4e90231af; Proxy: null)
以下是用于部署的模板片段,
apiGatewayRootMethod:
Type: "AWS::ApiGateway::Method"
Properties:
AuthorizationType: "NONE"
HttpMethod: "POST"
Integration:
CacheKeyParameters:
- 'method.request.path.proxy'
Credentials: !Ref 'apiGatewayRole'
IntegrationHttpMethod: "POST"
PassthroughBehavior: "NEVER"
RequestParameters:
integration.request.path.proxy: 'method.request.path.proxy'
RequestTemplates:
application/json: !Sub
- "{\"input\": \"$util.escapeJavaScript($input.json('$'))\",\"stateMachineArn\": \"${SPIStateMachine.Arn}\"}"
- StateMachineArn: !GetAtt [ SPIStateMachine,Arn ]
Type: "AWS"
Uri: !Sub
"arn:aws:apigateway:${AWS::Region}:states:action/StartExecution"
ResourceId: !GetAtt "apiGateway.RootResourceId"
RequestParameters:
method.request.path.proxy: true
RestApiId: !Ref "apiGateway"
SPIStateMachine:
Type: "AWS::StepFunctions::StateMachine"
Properties:
StateMachineName: !Sub ${AWS::StackName}-state-machine
RoleArn: !GetAtt [ StatesExecutionRole,Arn ]
DeFinitionString:
Fn::Sub:
|-
{
"Comment": "Calling Step Functions from Lambda SQS","StartAt": "APIGatewayLambda","States": {
"APIGatewayLambda": {
"Type": "Task","Resource": "${SPIApiFunction.Arn}","Catch": [
{
"ErrorEquals": ["CustomError"],"Next": "PythonLambda"
}
],"End": false
},"PythonLambda": {
"Type": "Task","Comment": "This is the mandatory lambda which will process the information and possible call the PowerShell script","Resource": "${SPILambdaFunctionOne.Arn}","Next": "Needs Additional Language?"
},"Needs Additional Language?": {
"Type": "Choice","Choices": [
{
"Variable": "$.platform","StringEquals": "powerbi","Next": "PowerShellLambda"
},{
"Not": {
"Variable": "$.platform","StringEquals": "powerbi"
},"Next": "Passthrough"
}
]
},"PowerShellLambda": {
"Type": "Task","Comment": "This is the PowerShell Lambda,to be run for PowerBI updates","Resource": "${SPILambdaFunctionTwo.Arn}","End": true
},"Passthrough": {
"Type": "Pass","End": true
}
}
}
编辑:
application/json: !Sub
- "{\"input\": \"$util.escapeJavaScript($input.json('$'))\",\"stateMachineArn\": \"${StateMachineArn}\"}"
- StateMachineArn: !Sub arn:aws:states:${AWS::Region}:${AWS::AccountId}:stateMachine:SPIStateMachine
这会导致相同的 apiGatewayRootMethod: entered status CREATE_Failed,reason: Invalid ARN specified in the request (Service: AmazonApiGateway; Status Code: 400; Error Code: BadRequestException; Request ID: 9585e311-69e1-4809-bc3c-f59a67a4546e; Proxy: null)
解决方法
这个好像不行
- StateMachineArn: !GetAtt [ SPIStateMachine,Arn ]
引用自 documentation
Fn::GetAtt Fn::GetAtt 返回此类型的指定属性的值。以下是可用的属性和示例返回值。
阿恩 AWS CloudFormation 目前不支持。
您可以使用 Fn::Sub
构建 ARN Fn::Sub: arn:aws:states:${AWS::Region}:${AWS::AccountId}:stateMachine:mystatemachine
编辑
所以 uri 应该是这种形式
arn:aws:apigateway:{region}:{subdomain.service|service}:path|action/{service_api}
在阶跃函数的情况下翻译:
Fn::Sub: arn:aws:apigateway:${AWS::Region}:states:action/StartExecution
这应该在 arn 的 cloudformation 模板中
#set($input = $input.json('$'))
{
"input": "$util.escapeJavaScript($input)","stateMachineArn": "<STATE_MACHINE_ARN>"
}
这会将发布到 API Gateway 的 json 负载传递给 Step Function。
您可以为 describing the execution 创建另一个 URI
Fn::Sub: arn:aws:apigateway:${AWS::Region}:states:action/DescribeExecution
为此,请求模板如下
requestTemplates:
application/json:
Fn::Sub: |-
{
"executionArn": "arn:aws:states:${AWS::Region}:${AWS::AccountId}:execution:${Workflow.Name}:$input.params().path.get('executionId')"
}
正如我所描述的一样,here 您可以找到工作示例。