营销网站 深圳,什么网站后台程序好用,wordpress页面层级,计算机做网站开题报告aws lambda使用在上一篇文章中#xff0c;我们实现了基于Java的aws lambda函数#xff0c;并使用CloudFront进行了部署。 由于我们已经设置了lambda函数#xff0c;因此我们将使用AWS API Gateway将其与http端点集成。 Amazon API Gateway是一项完全托管的服务#xff0c;… aws lambda使用 在上一篇文章中我们实现了基于Java的aws lambda函数并使用CloudFront进行了部署。 由于我们已经设置了lambda函数因此我们将使用AWS API Gateway将其与http端点集成。 Amazon API Gateway是一项完全托管的服务使开发人员可以轻松地创建发布维护监控和保护各种规模的API。 在AWS管理控制台中单击几下您可以创建一个API充当应用程序从您的后端服务例如Amazon Elastic Compute Cloud上运行的工作负载访问数据业务逻辑或功能的“前门”。 Amazon EC2在AWS Lambda或任何Web应用程序上运行的代码 对于此示例将API网关想象为一个HTTP连接器。 我们将更改原始功能以实现划分。 package com.gkatzioura.deployment.lambda;import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;import java.math.BigDecimal;
import java.util.Map;
import java.util.logging.Logger;/*** Created by gkatzioura on 9/10/2016.*/
public class RequestFunctionHandler implements RequestHandlerMapString,String,String {private static final String NUMERATOR_KEY numerator;private static final String DENOMINATOR_KEY denominator;private static final Logger LOGGER Logger.getLogger(RequestFunctionHandler.class.getName());public String handleRequest(Map String,String values, Context context) {LOGGER.info(Handling request);if(!values.containsKey(NUMERATOR_KEY)||!values.containsKey(DENOMINATOR_KEY)) {return You need both numberator and denominator;}try {BigDecimal numerator new BigDecimal(values.get(NUMERATOR_KEY));BigDecimal denominator new BigDecimal(values.get(DENOMINATOR_KEY));return numerator.divide(denominator).toString();} catch (Exception e) {return Please provide valid values;}}} 然后我们将更改lambda代码并在s3上对其进行更新。 aws s3 cp build/distributions/JavaLambdaDeployment.zip s3://lambda-functions/JavaLambdaDeployment.zip 下一步是更新我们的CloudFormation模板并将api网关转发请求添加到我们的lambda函数。 首先我们必须声明我们的Rest API AGRA16PAA: {Type: AWS::ApiGateway::RestApi,Properties: {Name: CalculationApi}} 然后我们需要添加一个休息资源。 在DependsOn元素内我们可以看到rest api的ID。 因此cloudwatch将在创建其余api之后创建资源。 AGR2JDQ8: {Type: AWS::ApiGateway::Resource,Properties: {RestApiId: {Ref: AGRA16PAA},ParentId: {Fn::GetAtt: [AGRA16PAA,RootResourceId]},PathPart: divide},DependsOn: [AGRA16PAA]} 另一个关键部分是添加权限以便能够调用我们的lambda函数。 LPI6K5: {Type: AWS::Lambda::Permission,Properties: {Action: lambda:invokeFunction,FunctionName: {Fn::GetAtt: [LF9MBL, Arn]},Principal: apigateway.amazonaws.com,SourceArn: {Fn::Join: [,[arn:aws:execute-api:, {Ref: AWS::Region}, :, {Ref: AWS::AccountId}, :, {Ref: AGRA16PAA}, /*]]}}} 最后一步是添加api网关方法以便能够从api网关调用我们的lambda函数。 此外我们将添加api网关部署指令。 Deployment: {Type: AWS::ApiGateway::Deployment,Properties: {RestApiId: { Ref: AGRA16PAA },Description: First Deployment,StageName: StagingStage},DependsOn : [AGM25KFD]},AGM25KFD: {Type: AWS::ApiGateway::Method,Properties: {AuthorizationType: NONE,HttpMethod: POST,ResourceId: {Ref: AGR2JDQ8},RestApiId: {Ref: AGRA16PAA},Integration: {Type: AWS,IntegrationHttpMethod: POST,IntegrationResponses: [{StatusCode: 200}],Uri: {Fn::Join: [,[arn:aws:apigateway:,{Ref: AWS::Region},:lambda:path/2015-03-31/functions/,{Fn::GetAtt: [LF9MBL, Arn]},/invocations]]}},MethodResponses: [{StatusCode: 200}]} 因此我们最终完成了新的cloudwatch配置。 {AWSTemplateFormatVersion: 2010-09-09,Resources: {LF9MBL: {Type: AWS::Lambda::Function,Properties: {Code: {S3Bucket: lambda-functions,S3Key: JavaLambdaDeployment.zip},FunctionName: SimpleRequest,Handler: com.gkatzioura.deployment.lambda.RequestFunctionHandler,MemorySize: 128,Role: arn:aws:iam::274402012893:role/lambda_basic_execution,Runtime: java8}},Deployment: {Type: AWS::ApiGateway::Deployment,Properties: {RestApiId: { Ref: AGRA16PAA },Description: First Deployment,StageName: StagingStage},DependsOn : [AGM25KFD]},AGM25KFD: {Type: AWS::ApiGateway::Method,Properties: {AuthorizationType: NONE,HttpMethod: POST,ResourceId: {Ref: AGR2JDQ8},RestApiId: {Ref: AGRA16PAA},Integration: {Type: AWS,IntegrationHttpMethod: POST,IntegrationResponses: [{StatusCode: 200}],Uri: {Fn::Join: [,[arn:aws:apigateway:,{Ref: AWS::Region},:lambda:path/2015-03-31/functions/,{Fn::GetAtt: [LF9MBL,Arn]},/invocations]]}},MethodResponses: [{StatusCode: 200}]},DependsOn: [LF9MBL,AGR2JDQ8,LPI6K5]},AGR2JDQ8: {Type: AWS::ApiGateway::Resource,Properties: {RestApiId: {Ref: AGRA16PAA},ParentId: {Fn::GetAtt: [AGRA16PAA,RootResourceId]},PathPart: divide},DependsOn: [AGRA16PAA]},AGRA16PAA: {Type: AWS::ApiGateway::RestApi,Properties: {Name: CalculationApi}},LPI6K5: {Type: AWS::Lambda::Permission,Properties: {Action: lambda:invokeFunction,FunctionName: {Fn::GetAtt: [LF9MBL, Arn]},Principal: apigateway.amazonaws.com,SourceArn: {Fn::Join: [,[arn:aws:execute-api:, {Ref: AWS::Region}, :, {Ref: AWS::AccountId}, :, {Ref: AGRA16PAA}, /*]]}}}}
} 最后但并非最不重要的一点是我们必须更新以前的cloudformation堆栈。 所以我们上传了我们的最新模板 aws s3 cp cloudformationjavalambda2.template s3://cloudformation-templates/cloudformationjavalambda2.template 我们要做的就是更新堆栈。 aws cloudformation update-stack --stack-name JavaLambdaStack --template-url https://s3.amazonaws.com/cloudformation-templates/cloudformationjavalambda2.template 我们的堆栈刚刚更新。 我们可以到达我们的api网关端点并尝试发布帖子。 curl -H Content-Type: application/json -X POST -d {numerator:1,denominator:2} https://{you api gateway endpoint}/StagingStage/divide
0.5 您可以在github上找到源代码。 翻译自: https://www.javacodegeeks.com/2016/10/java-aws-cloud-using-lambda-api-gateway-cloudformation.htmlaws lambda使用
