AWS中lambda与DynamoDB的集成

news2024/10/7 10:20:38

前言：我在整个集成过程中，存在最大的问题有两个，

1. 没有考虑到lambda函数的权限，即对DynamoDB或者其他如Kinesis的权限授权，导致无法写入或者读取。

2.最初使用了异步方式调用，导致无法写数据到DynamoDB，把代码改成同步调用即可

创建Lambda函数

'use strict'
console.log('Loading function');

var aws = require('aws-sdk');
var docClient = new aws.DynamoDB.DocumentClient({region: 'ap-southeast-1'});


exports.handler = function(event, context,callback)  {
    var records = event.Records;
    if(records){

        records.forEach(function(record){
            //console.log('record:',record);
            //var payload = new Buffer(record.kinesis.data,'base64').toString('ascii');
            var payload = Buffer.from(record.kinesis.data, 'base64').toString('ascii');
           
            console.log('Decode payload:',payload);
           
           var params ={
                Item:{
                    date:Date.now(),
                    message:payload
                },
                TableName:"Lambda-Dynamo-Write-Read-China"
            };
            if(docClient){
                console.log('docClient is not null');
                console.log('params date:',params.Item.date);
                //         //await ddb.put(params).promise();
                //await ddb.put(params).promise();
                docClient.put(params,function(err,data){
                    if(err){
                        console.log("Fail to Write into AWS DynamoDB");
                        callback(err,null);
                        
                    }else{
                        console.log("Successfully write item into AWS DynamoDB")
                        callback(null,data)
                    }
                    
                });
            }else{
                console.log('docClient is null');
            }
            
        });
        
    }else{
        console.log('records is empty');
    }
    
};

创建好之后保存，然后进行部署(deploy)

然后在IAM中，对相应的角色进行授权（lambda-kinsis-guangzhou-role-xxx)这个角色名是创建lambda自动生成的，在上面增加相应的权限即可。