[DynamoDB Local] DynamoDB LocalをDockerコンテナサービスとして起動し、別のDockerコンテナから呼び出す方法

            
            $ mkdir dynamodb_local_docker && cd dynamodb_local_docker
$ touch docker-compose.yml
        

            
            version: "3"

services:
  dynamodb:
    image: amazon/dynamodb-local
    container_name: dynamodb-local-docker-storage
    volumes:
      - "./data:/home/dynamodblocal/data"
    ports:
      - "5984:5984"
    command: "-jar DynamoDBLocal.jar -port 5984 -dbPath ./data -sharedDb"
        

            
            $ tree
.
├── data
│   └── shared-local-instance.db #👈この時点ではまだ生成していない
└── docker-compose.yml
        

            
            $ docker-compose up
Starting dynamodb-local-docker-storage ... done
Attaching to dynamodb-local-docker-storage
dynamodb-local-docker-storage | Initializing DynamoDB Local with the following configuration:
dynamodb-local-docker-storage | Port: 5984
dynamodb-local-docker-storage | InMemory: false
dynamodb-local-docker-storage | DbPath: ./data
dynamodb-local-docker-storage | SharedDb: true
dynamodb-local-docker-storage | shouldDelayTransientStatuses: false
dynamodb-local-docker-storage | CorsParams: *
dynamodb-local-docker-storage |
        

            
            // 👇のようにわざわざ新しくAWS.DynamoDBインスタンスをnewしなくても
// DynamoDB JavaScript Shell 起動時に、'dynamodb'という名の
// インスタンスが存在している. (今回は練習も兼ね, 新しいインスタンス'myDynamo'を生成)
const myDynamo = new AWS.DynamoDB({
    endpoint: "http://localhost:5984"
});

const params = {
    TableName: 'hand-game',
    AttributeDefinitions: [
        // 少なくともHASH属性に指定する代表変数が一つ必要.
        // RANGEも追加するなら１項目のみ記述できる.
        {
            AttributeName: 'challenger', // HASH用のフィールド
            AttributeType: 'S' // String型
        },
        {
            AttributeName: 'timestamp', // RANGE用のフィールド
            AttributeType: 'N' // Number型
        }
    ],
    KeySchema: [ // 先程のフィールドにスキーマを指定する.
        {
            AttributeName: 'challenger',
            KeyType: 'HASH'
        },
        {
            AttributeName: 'timestamp',
            KeyType: 'RANGE'
        }
    ],
    ProvisionedThroughput: {
        ReadCapacityUnits: 1,
        WriteCapacityUnits: 1
    }
}

myDynamo.createTable(params, (err, data) => {
    if (err) {
        console.log(err, err.stack);
    }
    else {
        console.log(data);
    }
})
        

            
            {"TableDescription":{"AttributeDefinitions":[{"AttributeName":"challenger","AttributeType":"S"},{"AttributeName":"timestamp","AttributeType":"N"}],"TableName":"hand-game","KeySchema":[{"AttributeName":"challenger","KeyType":"HASH"},{"AttributeName":"timestamp","KeyType":"RANGE"}],"TableStatus":"ACTIVE","CreationDateTime":"2019-10-02T14:50:32.561Z","ProvisionedThroughput":{"LastIncreaseDateTime":"1970-01-01T00:00:00.000Z","LastDecreaseDateTime":"1970-01-01T00:00:00.000Z","NumberOfDecreasesToday":0,"ReadCapacityUnits":1,"WriteCapacityUnits":1},"TableSizeBytes":0,"ItemCount":0,"TableArn":"arn:aws:dynamodb:ddblocal:000000000000:table/hand-game"}}
        

            
            const myDynamo = new AWS.DynamoDB({
    endpoint: "http://localhost:5984"
});

myDynamo.listTables({}, (err, data) => {
    if (err) { console.log(err, err.stack); }
    else { console.log(data); }
});
        

            
            const myDynamo = new AWS.DynamoDB({
    endpoint: "http://localhost:5984"
});

myDynamo.describeTable({ TableName: 'hand-game' }, (err, data) => {
    if (err) { console.log(err, err.stack); }
    else { console.log(data); }
});
        

            
            const docClient = new AWS.DynamoDB.DocumentClient({
    endpoint: "http://localhost:5984"
});

const date = new Date();
const epochTime = date.getTime();

const params = {
    TableName: 'hand-game',
    Item: {
        challenger: 'taro', // Hash key, mandatory
        timestamp: epochTime, // Range key, required
        challengerSign: '3',
        foeSign: '5',
        issue: 'draw'
    }
};

docClient.put(params, (err, data) => {
    if (err) {
        console.log(err);
    }
    else {
        console.log(data);
    }
});
        

            
            const docClient = new AWS.DynamoDB.DocumentClient({
    endpoint: "http://localhost:5984"
});

docClient.scan({ TableName: 'hand-game' },
    (err, data) => {
        if (err) {
            console.log(err, err.stack);
        }
        else {
            console.log(data);
        }
    }
);
        

            
            {"Items":[{"challenger":"taro","challengerSign":"3","issue":"draw","foeSign":"5","timestamp":1570029168460}],"Count":2,"ScannedCount":2}
        

            
            const docClient = new AWS.DynamoDB.DocumentClient({
    endpoint: "http://localhost:5984"
});

docClient.get({
        TableName: 'hand-game',
        Key: { // 取得したいHASH値とRANGE値をもつ要素を指定
            challenger: 'taro',
            timestamp: 1570029168460
        }
    }, (err, data) => {
    if (err) { console.log(err); }
    else { console.log(data); }
});
        

            
            $ tree -I "node_modules"
.
├── Dockerfile
├── docker-compose.yml
└── package.json
        

            
            FROM node:10-alpine

#Install dependent packages
RUN apk update && apk upgrade && apk add --no-cache \
    bash git openssh \
    python \
    curl \
    groff \
    jq

#awscli on dokcer alpine
ARG pip_installer="https://bootstrap.pypa.io/get-pip.py"
ARG awscli_version="1.16.248"

#Install awscli
RUN curl ${pip_installer} | python && \
    pip install awscli==${awscli_version}

#Completing input
RUN bash -c 'echo complete -C '/usr/bin/aws_completer' aws >> $HOME/.bashrc'

#Setting envirnment for development
WORKDIR /usr/src/app
ENV PS1="[\u@\h:\w]$"

#Installing npm package manager
RUN npm i -g yarn
        

            
            version: '3'

services:
    app: # appというサービス名で構築
        image: my/sls-offline-test # コンテナー名
        build: .
        environment:
            NODE_ENV: development
            AWS_ACCESS_KEY_ID: "ABCDEFGHIJKLMNOPQRST"
            AWS_SECRET_ACCESS_KEY: "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
            AWS_DEFAULT_REGION: "us-east-1"
            LOCAL_SLS_SERVICE_NAME: "sls-offline-test" # Serverless Offlineのアプリ名
        ports:
            - "5985:5985" # Serverless Offlineのサービス用に5985番を指定
            # - "3000:3000" # デフォルトのServerless Offileのサービスポート
        volumes:
            - ./:/usr/src/app
        tty: true
        

            
            $ docker-compose build
        

            
            $ docker-compose up -d
Creating your_awesome_project_app_1 ... done

$ docker-compose exec app bash
[root@xxxxxxxxxx:/usr/src/app]$
        

            
            {
    "name": "sls-offline-test",
    "version": "0.0.1",
    "scripts": {}
}
        

            
            $ yarn add serverless -D
        

            
            $ sls create --template aws-nodejs-ecma-script \
    --name $LOCAL_SLS_SERVICE_NAME \
    --path app
        

            
            $ tree -I 'node_modules'
.
├── Dockerfile
├── docker-compose.yml
├── package.json
├── app
│   ├── first.js
│   ├── package.json
│   ├── second.js
│   ├── serverless.yml
│   └── webpack.config.js
└── yarn.lock
        

            
            cd ./app && yarn install
        

            
            #'app'フォルダー内で実行
$ yarn add aws-sdk serverless-offline -S
        

            
            $ tree -I 'node_modules'
.
├── Dockerfile
├── docker-compose.yml
├── package.json
├── app
│   ├── handler.js
│   ├── package.json
│   ├── serverless.yml
│   └── webpack.config.js
└── yarn.lock
        

            
            service:
  name: sls-offline-test

plugins:
  - serverless-webpack
  - serverless-offline # ここにServerless Offlineプラグインを追加

custom:
  serverless-offline:
    host: 0.0.0.0 # 重要: 既定値のlocalhostではdocker内部から呼び出せません
    port: 5985 # サービスポートを5985に変更

provider:
  name: aws
  runtime: nodejs8.10

functions:
  play:
    handler: handler.playGame # handler.js内の playGame 関数を呼び出す
    events:
      - http:
          path: handgame
          method: post
  list:
    handler: handler.showHistory # handler.js内の showHistory 関数を呼び出す
    events:
      - http:
          path: handgame
          method: get
        

            
            #👇POSTメソッドのイメージ
curl 'http://localhost:5985/handgame?{何かのクエリ文字列}' -X POST

#👇GETメソッドのイメージ
curl 'http://localhost:5985/handgame'
        

            
            "use strict";

// オフライン(isOffline)を判定し、ローカル利用なら DynamoDB Localに、
// そうでないなら通常のAWSへサービスのターゲットを割り振ります。
const aws = require("aws-sdk");
const getDynamoClient = (event) => {
    let dynamodb = null;
    if ("isOffline" in event && event.isOffline) {
        dynamodb = new aws.DynamoDB.DocumentClient({
            region: "localhost",
            // Dockerコンテナの環境変数 OUTER_DYNAMODB_IP には別のyamlファイルを用意する (後述)
            endpoint: `http://${process.env.OUTER_DYNAMODB_IP}:5984`
        });
    } else {
        dynamodb = new aws.DynamoDB.DocumentClient();
    }
    return dynamodb;
}

// とあるローカルな遊びのルール...
const judgeGame = (challenger, foe) => {
    const c = Math.abs(challenger - foe);
    const c_sgn = Math.sign(challenger - foe);
    if (c === 1 && c_sgn > 0) {
        return "won";
    } else if (c === 1 && c_sgn < 0) {
        return "lose";
    } else {
        return "draw";
    }
}

// コンピュータと対戦させて、試合結果のインスタンスを吐き出す。
const createGameInstance = (challenger, challengerHand) => {
    const handRule = ["zero", "one", "two", "three", "four", "five"];
    const date = new Date();
    const foeHandIndex = Math.floor( Math.random() * 6);
    return {
        timestamp: date.getTime(),
        challenger: challenger,
        challengerSign: challengerHand,
        foeSign: handRule[foeHandIndex],
        issue: judgeGame(handRule.indexOf(challengerHand), foeHandIndex)
    };
}

// POSTメソッドの実体関数
module.exports.playGame = (event, context, callback) => {
    const gameResult = createGameInstance(
        event.queryStringParameters.name,
        event.queryStringParameters.hand
    );
    const params = {
        TableName: "hand-game", // 今回は'hand-game'というテーブル名を使います。
        Item: gameResult
    };

    const docClient = getDynamoClient(event);
    docClient.put(params, (error) => {
        const response = {statusCode: null, body: null};
        if (error) {
            console.log(error);
            response.statusCode = 500;
            response.body = {
                code: 500,
                message: "Doesn't show the list due to internal error!"
            };
        } else {
            response.statusCode = 200;
            response.body = JSON.stringify(gameResult);
        }
        callback(null, response);
    });
};

// GETメソッドの実体関数
module.exports.showHistory = (event, context, callback) => {
    const docClient = getDynamoClient(event);
    docClient.scan({
        TableName: "hand-game"　// 今回は'hand-game'というテーブル名を使います。
    }, (error, data) => {
        const response = {
            statusCode: null,
            body: null
        };
        if (error) {
            console.log(error);
            response.statusCode = 500;
            response.body = {
                code: 500,
                message: "Doesn't show the list due to internal error!"
            };
        } else if ("Items" in data) {
            response.statusCode = 200;
            response.body = JSON.stringify({handGame: data["Items"]});
        }
        callback(null, response);
    });
};
        

            
            {
    "name": "sls-offline-test",
    "version": "0.0.1",
    "scripts": {
        "start": "cd ./app && sls offline" // 👈 追加
    },
    "devDependencies": {
        "serverless": "^1.53.0"
    }
}
        

            
            $ tree -I 'node_modules'
.
├── Dockerfile
├── app
│   ├── handler.js
│   ├── package.json
│   ├── serverless.yml
│   ├── webpack.config.js
│   └── yarn.lock
├── docker-compose.yml
├── env-local.yml
├── package.json
└── yarn.lock
        

            
            $ docker-compose config
services:
  app:
    build:
      context: /{現在のプロジェクトのフォルダまでのパス}
    environment:
      AWS_ACCESS_KEY_ID: ABCDEFGHIJKLMNOPQRST
      AWS_DEFAULT_REGION: us-east-1
      AWS_SECRET_ACCESS_KEY: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
      LOCAL_SLS_SERVICE_NAME: sls-offline-test
      NODE_ENV: development
    image: my/sls-offline-test
    ports:
    - 5985:5985/tcp
    tty: true
    volumes:
    - /{現在のプロジェクトのフォルダまでのパス}:/usr/src/app:rw
version: '3.0'
        

            
            version: '3'

services:
  app:
    entrypoint: yarn start
    environment:
      OUTER_DYNAMODB_IP: "172.0.0.1" # 適当なIP値を与えておきます
        

            
            $ docker-compose -f docker-compose.yml -f env-local.yml config
services:
  app:
    build:
      context: /{現在のプロジェクトのフォルダまでのパス}
    entrypoint: yarn start # 👈この項目が追加
    environment:
      AWS_ACCESS_KEY_ID: ABCDEFGHIJKLMNOPQRST
      AWS_DEFAULT_REGION: us-east-1
      AWS_SECRET_ACCESS_KEY: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
      LOCAL_SLS_SERVICE_NAME: sls-offline-test
      NODE_ENV: development
      OUTER_DYNAMODB_IP: 172.0.0.1 # 👈この項目が追加
    image: my/sls-offline-test
    ports:
    - 5985:5985/tcp
    tty: true
    volumes:
    - /{現在のプロジェクトのフォルダまでのパス}:/usr/src/app:rw
version: '3.0'
        

            
            #👇DynamoDB Local のコンテナIDをチェック
$ docker ps -a
CONTAINER ID        IMAGE                   COMMAND                  CREATED             STATUS                      PORTS                              NAMES
b7209695b7e1        amazon/dynamodb-local   "java -jar DynamoDBL…"   6 hours ago         Up 6 hours                  0.0.0.0:5984->5984/tcp, 8000/tcp   dynamodb-local-docker-storage

#👇コンテナIDからIPを取得
$ docker inspect --format='{{range .NetworkSettings.Networks}}{{.Gateway}}{{end}}' b72
172.19.0.1
        

            
            version: '3'

services:
  app:
    entrypoint: yarn start
    environment:
      OUTER_DYNAMODB_IP: "172.19.0.1" # DynamoDB Localコンテナの(デフォルトゲートウェイ)IP
        

            
            $ docker-compose -f docker-compose.yml -f env-local.yml up
$ cd ./app && sls offline
app_1  | Serverless: Bundling with Webpack...
app_1  | Time: 6313ms
app_1  | Built at: 10/06/2019 9:47:16 AM
app_1  |      Asset     Size   Chunks             Chunk Names
app_1  | handler.js  6.4 MiB  handler  [emitted]  handler
app_1  | Entrypoint handler = handler.js
#...中略
app_1  | Serverless: Starting Offline: dev/us-east-1.
app_1  |
app_1  | Serverless: Routes for play:
app_1  | Serverless: POST /handgame
app_1  | Serverless: POST /{apiVersion}/functions/sls-offline-test-dev-play/invocations
app_1  |
app_1  | Serverless: Routes for list:
app_1  | Serverless: GET /handgame
app_1  | Serverless: POST /{apiVersion}/functions/sls-offline-test-dev-list/invocations
app_1  |
app_1  | Serverless: Offline [HTTP] listening on http://0.0.0.0:5985
app_1  | Serverless: Enter "rp" to replay the last request
        

            
            #👇チャレンジャー名=tarao が 零の手=zero を出して勝負
$ curl 'http://localhost:5985/handgame?hand=zero&name=tarao' -X POST | jq '.'
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   104  100   104    0     0    298      0 --:--:-- --:--:-- --:--:--   298
{
  "timestamp": 1570355702256,
  "challenger": "tarao",
  "challengerSign": "zero",
  "foeSign": "four",
  "issue": "draw"
}

#👇チャレンジャー名=ikura が 四の手=four を出して勝負
$ curl 'http://localhost:5985/handgame?hand=four&name=ikura' -X POST | jq '.'
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   104  100   104    0     0    515      0 --:--:-- --:--:-- --:--:--   517
{
  "timestamp": 1570355971259,
  "challenger": "ikura",
  "challengerSign": "four",
  "foeSign": "five",
  "issue": "lose"
}
        

            
            $ curl 'http://localhost:5985/handgame' | jq '.'
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  1360  100  1360    0     0   8545      0 --:--:-- --:--:-- --:--:--  8553
{
  "handGame": [
    {
      "challenger": "ikura",
      "challengerSign": "four",
      "issue": "lose",
      "foeSign": "five",
      "timestamp": 1570355971259
    },
    {
      "challenger": "tarao",
      "challengerSign": "zero",
      "issue": "draw",
      "foeSign": "four",
      "timestamp": 1570355702256
    }
  ]
}