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@tcsh(Hirokazu HATANO)

[JAWS-UG CLI] Lambda:#23 Lambda関数の作成・実行 (microservice_http_endpoint-python)

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前提条件

Lambdaへの権限

Lambdaに対してフル権限があること。

DynamoDBへの権限

DynamoDBに対して読み取り権限があること。

AWS CLI

以下のバージョンで動作確認済

  • AWS CLI 1.10.47
コマンド
aws --version

結果(例):

  aws-cli/1.11.34 Python/2.7.10 Darwin/15.6.0 botocore/1.4.91

バージョンが古い場合は最新版に更新しましょう。

コマンド
sudo -H pip install -U awscli

IAM Role

LambdaMicroserviceHttpEndpointRoleロールが存在すること。

  1. 準備
    =======

0.1. リージョンの決定

変数の設定
export AWS_DEFAULT_REGION='ap-northeast-1'

0.2. プロファイルの確認

プロファイルが想定のものになっていることを確認します。

変数の確認
aws configure list

結果(例):

        Name                    Value             Type    Location
        ----                    -----             ----    --------
     profile       lambdaFull-prjz-mbp13        env    AWS_DEFAULT_PROFILE
  access_key     ****************XXXX shared-credentials-file
  secret_key     ****************XXXX shared-credentials-file
      region        ap-northeast-1        env    AWS_DEFAULT_REGION

0.3. DynamoDBテーブル名の指定

コマンド
DYNAMO_TABLE_NAME='microservice-http'
  1. 事前作業
    ===========

1.1. Lambda関数名の決定

変数の設定
LAMBDA_FUNC_NAME="microservice_http_endpoint-$( date '+%Y%m%d' )" \
        && echo ${LAMBDA_FUNC_NAME}

同名のLambda関数の不存在確認

コマンド
aws lambda get-function \
        --function-name ${LAMBDA_FUNC_NAME}

結果(例):

  A client error (ResourceNotFoundException) occurred when calling the GetFunction operation: Function not found: arn:aws:lambda:ap-northeast-1:XXXXXXXXXXXX:function:microservice_http_endpoint-20170101

1.2. IAM Roleの指定

変数の設定
IAM_ROLE_NAME='LambdaMicroserviceHttpEndpointRole'
コマンド
aws iam get-role \
         --role-name ${IAM_ROLE_NAME}

結果(例):

  {
      "Role": {
        "AssumeRolePolicyDocument": {
            "Version": "2012-10-17",
            "Statement": [
                {
                    "Action": "sts:AssumeRole",
                    "Principal": {
                        "Service": "lambda.amazonaws.com"
                    },
                    "Effect": "Allow",
                    "Sid": ""
                }
            ]
        },
        "RoleId": "AROAXXXXXXXXXXXXXXXXX",
        "CreateDate": "2016-12-31T01:23:45Z",
        "RoleName": "LambdaMicroserviceHttpEndpointRole",
        "Path": "/",
        "Arn": "arn:aws:iam::XXXXXXXXXXXX:role/LambdaMicroserviceHttpEndpointRole"
      }
  }
コマンド
IAM_ROLE_ARN=$( \
        aws iam get-role \
          --role-name ${IAM_ROLE_NAME} \
          --query 'Role.Arn' \
          --output text \
) \
        && echo ${IAM_ROLE_ARN}

結果(例):

  arn:aws:iam::XXXXXXXXXXXX:role/LambdaMicroserviceHttpEndpointRole

1.3. Lambda関数

変数の設定
FILE_LAMBDA_FUNC="${LAMBDA_FUNC_NAME}.py"
PY_FUNC_NAME='lambda_handler'
変数の確認
cat << ETX

          FILE_LAMBDA_FUNC: ${FILE_LAMBDA_FUNC}
          PY_FUNC_NAME:     ${PY_FUNC_NAME}

ETX
コマンド
cat << EOF > ${FILE_LAMBDA_FUNC}
from __future__ import print_function

import boto3
import json

print('Loading function')


def respond(err, res=None):
    return {
        'statusCode': '400' if err else '200',
        'body': err.message if err else json.dumps(res),
        'headers': {
            'Content-Type': 'application/json',
        },
    }


def ${PY_FUNC_NAME}(event, context):
    #print("Received event: " + json.dumps(event, indent=2))

    operations = {
        'DELETE': lambda dynamo, x: dynamo.delete_item(**x),
        'GET': lambda dynamo, x: dynamo.scan(**x),
        'POST': lambda dynamo, x: dynamo.put_item(**x),
        'PUT': lambda dynamo, x: dynamo.update_item(**x),
    }

    operation = event['httpMethod']
    if operation in operations:
        payload = event['queryStringParameters'] if operation == 'GET' else json.loads(event['body'])
        dynamo = boto3.resource('dynamodb').Table(payload['TableName'])
        return respond(None, operations[operation](dynamo, payload))
    else:
        return respond(ValueError('Unsupported method "{}"'.format(operation)))
EOF

cat ${FILE_LAMBDA_FUNC}
コマンド
zip ${LAMBDA_FUNC_NAME}.zip ${FILE_LAMBDA_FUNC}

結果(例):

  adding: microservice_http_endpoint-20170101.py (deflated 43%)
  1. Lambda関数の作成
    ===================
変数の設定
LAMBDA_FUNC_DESC='Microservice HTTP Endpoint 20170101'
LAMBDA_RUNTIME='python2.7'
LAMBDA_HANDLER="${LAMBDA_FUNC_NAME}.${PY_FUNC_NAME}"
FILE_LAMBDA_ZIP="${LAMBDA_FUNC_NAME}.zip"
変数の確認
cat << ETX

        LAMBDA_FUNC_NAME:  ${LAMBDA_FUNC_NAME}
        LAMBDA_FUNC_DESC: "${LAMBDA_FUNC_DESC}"
        LAMBDA_RUNTIME:    ${LAMBDA_RUNTIME}
        FILE_LAMBDA_ZIP    ${FILE_LAMBDA_ZIP}
        IAM_ROLE_ARN:      ${IAM_ROLE_ARN}
        LAMBDA_HANDLER:    ${LAMBDA_HANDLER}

ETX
コマンド
aws lambda create-function \
        --function-name ${LAMBDA_FUNC_NAME} \
        --description "${LAMBDA_FUNC_DESC}" \
        --zip-file fileb://${FILE_LAMBDA_ZIP} \
        --runtime ${LAMBDA_RUNTIME} \
        --role ${IAM_ROLE_ARN} \
        --handler ${LAMBDA_HANDLER}

結果(例):

  {
    "CodeSha256": "+edf74XvKEs4oYFOflSRJydF5n5F0SEL34ujm7+kAPk=",
    "FunctionName": "microservice_http_endpoint-20170101",
    "CodeSize": 726,
    "MemorySize": 128,
    "FunctionArn": "arn:aws:lambda:ap-northeast-1:XXXXXXXXXXXX:function:microservice_http_endpoint-20170101",
    "Version": "$LATEST",
    "Role": "arn:aws:iam::XXXXXXXXXXXX:role/LambdaMicroserviceHttpEndpointRole",
    "Timeout": 3,
    "LastModified": "2016-12-31T01:23:45.678+0000",
    "Handler": "microservice_http_endpoint-20170101.lambda_handler",
    "Runtime": "python2.7",
    "Description": "Microservice HTTP Endpoint 20170101"
  }
コマンド
aws lambda get-function \
        --function-name ${LAMBDA_FUNC_NAME}

結果(例):

  {
    "Code": {
      "RepositoryType": "S3",
      "Location": "https://awslambda-ap-ne-1-tasks.s3-ap-northeast-1.amazonaws.com/snapshots/XXXXXXXXXXXX/microservice_http_endpoint-20170101-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
    },
    "Configuration": {
      "Version": "$LATEST",
      "CodeSha256": "+edf74XvKEs4oYFOflSRJydF5n5F0SEL34ujm7+kAPk=",
      "FunctionName": "microservice_http_endpoint-20170101",
      "MemorySize": 128,
      "CodeSize": 350,
      "FunctionArn": "arn:aws:lambda:ap-northeast-1:XXXXXXXXXXXX:function:microservice_http_endpoint-20170101",
      "Handler": "microservice_http_endpoint-20170101.lambda_handler",
      "Role": "arn:aws:iam::XXXXXXXXXXXX:role/LambdaMicroserviceHttpEndpointRole",
      "Timeout": 3,
      "LastModified": "2016-12-31T01:23:45.678+0000",
      "Runtime": "python2.7",
      "Description": "Microservice HTTP Endpoint 20170101"
    }
  }
  1. Lambda関数の動作確認
    =======================

3.1. GET

変数の設定
FILE_INPUT="${LAMBDA_FUNC_NAME}-get.json" \
        && echo ${FILE_INPUT}
コマンド
cat << EOF > ${FILE_INPUT}
{
         "httpMethod": "GET",
         "queryStringParameters": {
             "TableName": "microservice-http"
         }
}
EOF

cat ${FILE_INPUT}

JSONファイルを作成したら、フォーマットが壊れてないか必ず確認します。

コマンド
jsonlint -q ${FILE_INPUT}

エラーが出力されなければOKです。

変数の設定
FILE_OUTPUT_LAMBDA="${LAMBDA_FUNC_NAME}-out.txt"
FILE_LOG_LAMBDA="${LAMBDA_FUNC_NAME}-$(date +%Y%m%d%H%M%S).log"
変数の確認
cat << ETX

        LAMBDA_FUNC_NAME:   ${LAMBDA_FUNC_NAME}
        FILE_INPUT:         ${FILE_INPUT}
        FILE_OUTPUT_LAMBDA: ${FILE_OUTPUT_LAMBDA}
        FILE_LOG_LAMBDA:    ${FILE_LOG_LAMBDA}

ETX
コマンド
aws lambda invoke \
        --function-name ${LAMBDA_FUNC_NAME} \
        --log-type Tail \
        --payload file://${FILE_INPUT} \
        ${FILE_OUTPUT_LAMBDA} \
        > ${FILE_LOG_LAMBDA}
コマンド
cat ${FILE_LOG_LAMBDA} \
        | jp.py 'StatusCode'

結果(例):

  200
コマンド
cat ${FILE_OUTPUT_LAMBDA}

結果(例):

  {"body": "{\"Count\": 1, \"Items\": [{\"Description\": \"sample\", \"Name\": \"taro\"}], \"ScannedCount\": 1, \"ResponseMetadata\": {\"RetryAttempts\": 0, \"HTTPStatusCode\": 200, \"RequestId\": \"GJTSB9TE10U7O0SS9JC9050FD7VV4KQNSO5AEMVJF66Q9ASUAAJG\", \"HTTPHeaders\": {\"x-amzn-requestid\": \"GJTSB9TE10U7O0SS9JC9050FD7VV4KQNSO5AEMVJF66Q9ASUAAJG\", \"content-length\": \"89\", \"server\": \"Server\", \"connection\": \"keep-alive\", \"x-amz-crc32\": \"2586798783\", \"date\": \"Sat, 31 Dec 2016 13:22:26 GMT\", \"content-type\": \"application/x-amz-json-1.0\"}}}", "headers": {"Content-Type": "application/json"}, "statusCode": "200"}
コマンド
aws dynamodb scan \
        --table-name ${DYNAMO_TABLE_NAME}

結果(例):

  {
    "Count": 1,
    "Items": [
      {
          "Description": {
              "S": "sample"
          },
          "Name": {
              "S": "taro"
          }
      }
    ],
    "ScannedCount": 1,
    "ConsumedCapacity": null
  }

3.2. POST

変数の設定
FILE_INPUT="${LAMBDA_FUNC_NAME}-post.json" \
        && echo ${FILE_INPUT}
コマンド
cat << EOF > ${FILE_INPUT}
{
        "httpMethod": "POST",
        "body": "{\"TableName\":\"microservice-http\",\"Item\":{\"Name\":\"jiro\",\"Description\":\"sample2\"}}"
}
EOF

cat ${FILE_INPUT}

JSONファイルを作成したら、フォーマットが壊れてないか必ず確認します。

コマンド
jsonlint -q ${FILE_INPUT}

エラーが出力されなければOKです。

変数の設定
FILE_OUTPUT_LAMBDA="${LAMBDA_FUNC_NAME}-out.txt"
FILE_LOG_LAMBDA="${LAMBDA_FUNC_NAME}-$(date +%Y%m%d%H%M%S).log"
変数の確認
cat << ETX

        LAMBDA_FUNC_NAME:   ${LAMBDA_FUNC_NAME}
        FILE_INPUT:         ${FILE_INPUT}
        FILE_OUTPUT_LAMBDA: ${FILE_OUTPUT_LAMBDA}
        FILE_LOG_LAMBDA:    ${FILE_LOG_LAMBDA}

ETX
コマンド
aws lambda invoke \
        --function-name ${LAMBDA_FUNC_NAME} \
        --log-type Tail \
        --payload file://${FILE_INPUT} \
        ${FILE_OUTPUT_LAMBDA} \
        > ${FILE_LOG_LAMBDA}
コマンド
cat ${FILE_LOG_LAMBDA} \
        | jp.py 'StatusCode'

結果(例):

  200
コマンド
cat ${FILE_OUTPUT_LAMBDA}

結果(例):

  {"body": "{\"ResponseMetadata\": {\"RetryAttempts\": 0, \"HTTPStatusCode\": 200, \"RequestId\": \"C96O73JS0QB4NRH3U5D30JE9GRVV4KQNSO5AEMVJF66Q9ASUAAJG\", \"HTTPHeaders\": {\"x-amzn-requestid\": \"C96O73JS0QB4NRH3U5D30JE9GRVV4KQNSO5AEMVJF66Q9ASUAAJG\", \"content-length\": \"2\", \"server\": \"Server\", \"connection\": \"keep-alive\", \"x-amz-crc32\": \"2745614147\", \"date\": \"Sat, 31 Dec 2016 13:57:18 GMT\", \"content-type\": \"application/x-amz-json-1.0\"}}}", "headers": {"Content-Type": "application/json"}, "statusCode": "200"}
コマンド
aws dynamodb scan \
        --table-name ${DYNAMO_TABLE_NAME}

結果(例):

  {
    "Count": 2,
    "Items": [
      {
          "Description": {
              "S": "sample2"
          },
          "Name": {
              "S": "jiro"
          }
      },
      {
          "Description": {
              "S": "sample"
          },
          "Name": {
              "S": "taro"
          }
      }
    ],
    "ScannedCount": 2,
    "ConsumedCapacity": null
  }

3.3. DELETE

変数の設定
FILE_INPUT="${LAMBDA_FUNC_NAME}-delete.json" \
        && echo ${FILE_INPUT}
コマンド
cat << EOF > ${FILE_INPUT}
{
        "httpMethod": "DELETE",
        "body": "{\"TableName\":\"microservice-http\",\"Key\":{\"Name\":\"jiro\"}}"
}
EOF

cat ${FILE_INPUT}

JSONファイルを作成したら、フォーマットが壊れてないか必ず確認します。

コマンド
jsonlint -q ${FILE_INPUT}

エラーが出力されなければOKです。

変数の設定
FILE_OUTPUT_LAMBDA="${LAMBDA_FUNC_NAME}-out.txt"
FILE_LOG_LAMBDA="${LAMBDA_FUNC_NAME}-$(date +%Y%m%d%H%M%S).log"
変数の確認
cat << ETX

        LAMBDA_FUNC_NAME:   ${LAMBDA_FUNC_NAME}
        FILE_INPUT:         ${FILE_INPUT}
        FILE_OUTPUT_LAMBDA: ${FILE_OUTPUT_LAMBDA}
        FILE_LOG_LAMBDA:    ${FILE_LOG_LAMBDA}

ETX
コマンド
aws lambda invoke \
        --function-name ${LAMBDA_FUNC_NAME} \
        --log-type Tail \
        --payload file://${FILE_INPUT} \
        ${FILE_OUTPUT_LAMBDA} \
        > ${FILE_LOG_LAMBDA}
コマンド
cat ${FILE_LOG_LAMBDA} \
        | jp.py 'StatusCode'

結果(例):

  200
コマンド
cat ${FILE_OUTPUT_LAMBDA}

結果(例):

  {"body": "{\"ResponseMetadata\": {\"RetryAttempts\": 0, \"HTTPStatusCode\": 200, \"RequestId\": \"R43F60O4UNN5B1FR3UKFR25R43VV4KQNSO5AEMVJF66Q9ASUAAJG\", \"HTTPHeaders\": {\"x-amzn-requestid\": \"R43F60O4UNN5B1FR3UKFR25R43VV4KQNSO5AEMVJF66Q9ASUAAJG\", \"content-length\": \"2\", \"server\": \"Server\", \"connection\": \"keep-alive\", \"x-amz-crc32\": \"2745614147\", \"date\": \"Sat, 31 Dec 2016 13:58:51 GMT\", \"content-type\": \"application/x-amz-json-1.0\"}}}", "headers": {"Content-Type": "application/json"}, "statusCode": "200"}
コマンド
aws dynamodb scan \
        --table-name ${DYNAMO_TABLE_NAME}

結果(例):

  {
    "Count": 1,
    "Items": [
      {
          "Description": {
              "S": "sample"
          },
          "Name": {
              "S": "taro"
          }
      }
    ],
    "ScannedCount": 1,
    "ConsumedCapacity": null
  }

完了

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