[英]How to pass event parameters to AWS Lambda function using API Gateway?
[英]How can I request parameters in api gateway using cloudformation in aws and pass it down to lambda function?
我正在尝试使用 AWS CloudFormation 中的 API Gateway 请求参数。 我想从 API 网关传递给 Lambda 函数的参数是“action”。 我已经尝试了以下代码,到目前为止我遇到了错误,如下所述。 有人可以帮助我确定问题和可能的解决方案吗?
“指定的映射表达式无效:验证结果:警告:[],错误:[指定的映射表达式无效:Integration.request.path.action](服务:AmazonApiGateway;状态代码:400;错误代码:BadRequestException;请求 ID:037f4753- 52b5-4276-979a-131a0f903e63)"
AWSTemplateFormatVersion: "2010-09-09"
Description: "API Gateway and Lambda function"
Resources:
SampleApi:
Type: "AWS::ApiGateway::RestApi"
Properties:
Name: Sample
SampleApiMethod:
Type: "AWS::ApiGateway::Method"
Properties:
AuthorizationType: "NONE"
HttpMethod: "GET"
RequestParameters:
method.request.path.action: true
RequestTemplates:
application/yaml
Integration:
IntegrationHttpMethod: "POST"
Type: "AWS_PROXY"
RequestParameters:
Integration.request.path.action: method.request.path.action
Uri: !Sub
- "arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${lambdaArn}/invocations"
- lambdaArn: !GetAtt "SampleLambda.Arn"
CacheKeyParameters:
- method.request.path.action
ResourceId: !GetAtt "SampleApi.RootResourceId"
RestApiId: !Ref "SampleApi"
SampleApiDeployment:
Type: "AWS::ApiGateway::Deployment"
DependsOn: "SampleApiMethod"
Properties:
RestApiId: !Ref "SampleApi"
StageName: test
SampleLambda:
Type: "AWS::Lambda::Function"
Properties:
Code:
ZipFile: |
import yaml
import boto3
cf_client = boto3.client('cloudformation')
cf_client.create_stack(
StackName='your-stack',
TemplateURL='Some URL',
Parameters=[
{
'ParameterKey':'action',
'ParameterValue': 'kms:*'
},
]
)
Handler: "index.handler"
Role: !GetAtt "SampleLambdaRole.Arn"
Runtime: python3.7
LambdaApiGatewayInvoke:
Type: "AWS::Lambda::Permission"
Properties:
Action: "lambda:InvokeFunction"
FunctionName: !GetAtt "SampleLambda.Arn"
Principal: "apigateway.amazonaws.com"
SourceArn: !Sub "arn:aws:execute-api:${AWS::Region}:${AWS::AccountId}:${SampleApi}/*/GET/"
SampleLambdaRole:
Type: "AWS::IAM::Role"
Properties:
AssumeRolePolicyDocument:
Version: "2012-10-17"
Statement:
- Action: ["sts:AssumeRole"]
Effect: "Allow"
Principal:
Service: ["lambda.amazonaws.com"]
Policies:
- PolicyDocument:
Version: "2012-10-17"
Statement:
- Action: ["cloudwatch:*", "logs:*"]
Effect: "Allow"
Resource: "*"
PolicyName: "lambdaLogPolicy"
Outputs:
apiGatewayInvokeURL:
Value: !Sub 'https://Sample.execute-api.${AWS::Region}.amazonaws.com/test'
根据文档, RequestParameters
的键应该像integration.request.<location>.<name>
,带有小写的i
用于integration
。 您正在使用大写的I
。 来自AWS CloudFormation 文档:
使用以下模式
integration.request.location.name
指定目标,其中location
是查询字符串、路径或标头,name
是有效的唯一参数名称。
此外,您上面的模板包含一个RequestTemplates
属性,该属性位于错误的层次结构级别。 它也必须放在Integration
下方,如AWS CloudFormation 文档中所述。 以下是适合您的AWS::ApiGateway::Method
模板:
SampleApiMethod:
Type: "AWS::ApiGateway::Method"
Properties:
AuthorizationType: "NONE"
HttpMethod: "GET"
RequestParameters:
method.request.path.action: true
Integration:
IntegrationHttpMethod: "POST"
Type: "AWS_PROXY"
RequestParameters:
integration.request.path.action: method.request.path.action
RequestTemplates:
"application/yaml": "<define your template here>"
Uri: !Sub
- "arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${lambdaArn}/invocations"
- lambdaArn: !GetAtt "SampleLambda.Arn"
CacheKeyParameters:
- method.request.path.action
ResourceId: !GetAtt "SampleApi.RootResourceId"
RestApiId: !Ref "SampleApi"
有关定义请求模板的更多信息,请参见开发人员参考。
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