DynamoDBLocal：如何启动和停止数据库？

Question

我有一个 "dynamodb_helper.js" 并且我使用 local-dynamo 在本地模拟 DynamoDB。我能够在测试前成功启动服务器并运行它，但 stopDB() 似乎不起作用。任何 help/suggestions 将不胜感激。所以即使在测试结束后，服务器子进程仍然保持运行ning。

请在下面找到我的代码。

    var AWS = require("aws-sdk");
var localDynamo = require('local-dynamo');
var dynamoServer = null;
var dynamodb = null;
var dynamo = null;

module.exports = {
  startDB: function() {
    dynamoServer = localDynamo.launch({
     port: 4567,
     detached: true,
     heap: '512m',
     stdio: 'pipe'
    })
    var awsConfig = require('../lib/util').ymlParser('aws');
    AWS.config.update(awsConfig);
    AWS.config.update({
     accessKeyId: "TestData",
     secretAccessKey: "TestData",
     region: "localhost",
     endpoint: "http://localhost:4567"
    });
    dynamodb = new AWS.DynamoDB();
    dynamo = dynamodb.DocumentClient;
  },

  stopDB: function() {
    setTimeout(function () {
        dynamoServer.kill();
      }, 1000)
  },

  createTable: function() {
    var params = {
        TableName : "Movies",
        KeySchema: [
            { AttributeName: "year", KeyType: "HASH"},  //Partition key
            { AttributeName: "title", KeyType: "RANGE" }  //Sort key
        ],
        AttributeDefinitions: [
            { AttributeName: "year", AttributeType: "N" },
            { AttributeName: "title", AttributeType: "S" }
        ],
        ProvisionedThroughput: {
            ReadCapacityUnits: 10,
            WriteCapacityUnits: 10
        }
    };
    dynamodb.createTable(params, function(err, data) {
        if (err) {
            console.error("Unable to create table. Error JSON:", JSON.stringify(err, null, 2));
        } else {
            console.log("Created table. Table description JSON:", JSON.stringify(data, null, 2));
        }
    });
  }
};

Answer 1

在顶部添加：-

var treeKill = require('tree-kill');

如下所述更改 stopDB:-

stopDB : function() {
    console.log("Stop the dynamodb");
    console.log("Dynamodb pid number :" + dynamoServer.pid);        

    treeKill(dynamoServer.pid, 'SIGTERM', function(err) {
        if (err === null) {
            console.log("Dynamodb process has been killed");    
        } else {
            console.log("Dynamodb process hasn't been killed : " + JSON.stringify(err));
        }

    });
},

使用 treeKill 终止进程，因为 "kill" 方法并不能真正终止进程。

Note that while the function is called kill, the signal delivered to the child process may not actually terminate the process.

Child Process Kill Reference Document

DynamoDBLocal：如何启动和停止数据库？

DynamoDBLocal : How can I start and stop DB?

node.js

amazon-dynamodb

dynamo-local