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[JAWS-UG CLI] Lambda:#15 canary (Python版)

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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。

AWS CLI

以下のバージョンで動作確認済

  • AWS CLI 1.10.33
  • AWS CLI 1.10.20
コマンド
aws --version
結果(例)
      aws-cli/1.10.20 Python/2.7.11 Darwin/15.4.0 botocore/1.4.11

IAM Role

'lambdaBasicExecution'ロールが存在すること。

変数の設定
IAM_ROLE_NAME='lambdaBasicExecution'
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": "2015-10-26T01:55:54Z",
            "RoleName": "lambdaBasicExecution",
            "Path": "/",
            "Arn": "arn:aws:iam::XXXXXXXXXXXX:role/lambdaBasicExecution"
          }
      }

存在しない場合は、
http://qiita.com/tcsh/items/455fcea33fc1171a5502
の手順に従って作成してください。

0. 準備

0.1. リージョンの指定

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

0.2. 変数の確認

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

0.2. IAM RoleのARN取得

変数の設定
IAM_ROLE_NAME='lambdaBasicExecution'
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/lambdaBasicExecution

1. 事前作業

1.1. Lambda関数名の決定

変数の設定
LAMBDA_FUNC_NAME="canary-$( date '+%Y%m%d' )"

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:canary-20160425

1.2. 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

2016-05-28時点で、blueprintのターゲット( 'https://www.amazon.com/' に'Online Shopping'があることをチェックする)そのままでは503エラーが出るので、 http://aws.amazon.com/jp/ に'AWS'があることをチェックするように修正してあります。( https://forums.aws.amazon.com/thread.jspa?threadID=232591 )

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

from datetime import datetime
from urllib2 import urlopen

SITE = 'https://aws.amazon.com/jp/'  # URL of the site to check
EXPECTED = 'AWS'  # String expected to be on the page


def validate(res):
    '''Return False to trigger the canary

    Currently this simply checks whether the EXPECTED string is present.
    However, you could modify this to perform any number of arbitrary
    checks on the contents of SITE.
    '''
    return EXPECTED in res


def ${PY_FUNC_NAME}(event, context):
    print('Checking {} at {}...'.format(SITE, event['time']))
    try:
        if not validate(urlopen(SITE).read()):
            raise Exception('Validation failed')
    except:
        print('Check failed!')
        raise
    else:
        print('Check passed!')
        return event['time']
    finally:
        print('Check complete at {}'.format(str(datetime.now())))
EOF

cat ${FILE_LAMBDA_FUNC}
コマンド
zip ${LAMBDA_FUNC_NAME}.zip ${FILE_LAMBDA_FUNC}
結果(例)
      adding: canary-20160425.py (deflated 43%)

2. Lambda関数の作成

変数の設定
LAMBDA_FUNC_DESC='Performs a periodic check of the given site, erroring out on test failure.'
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": "WnGd6iPBS0rGCJor4zyuOaGBtzQ3I/OgHerXWqZzbL8=",
        "FunctionName": "canary-20160425",
        "CodeSize": 350,
        "MemorySize": 128,
        "FunctionArn": "arn:aws:lambda:ap-northeast-1:XXXXXXXXXXXX:function:canary-20160425",
        "Version": "$LATEST",
        "Role": "arn:aws:iam::XXXXXXXXXXXX:role/lambdaBasicExecution",
        "Timeout": 3,
        "LastModified": "2015-10-26T02:08:11.949+0000",
        "Handler": "canary-20160425.lambda_handler",
        "Runtime": "python2.7",
        "Description": "Performs a periodic check of the given site, erroring out on test failure."
      }
コマンド
aws lambda list-functions 
結果(例)

      {
          "Functions": [
            {
                "Version": "$LATEST",
                "CodeSha256": "WnGd6iPBS0rGCJor4zyuOaGBtzQ3I/OgHerXWqZzbL8=",
                "FunctionName": "canary-20160425",
                "MemorySize": 128,
                "CodeSize": 350,
                "FunctionArn": "arn:aws:lambda:ap-northeast-1:XXXXXXXXXXXX:function:canary-20160425",
                "Handler": "canary-20160425.lambda_handler",
                "Role": "arn:aws:iam::XXXXXXXXXXXX:role/lambdaBasicExecution",
                "Timeout": 3,
                "LastModified": "4月 25, 2016T02:08:11.949+0000",
                "Runtime": "python2.7",
                "Description": "Performs a periodic check of the given site, erroring out on test failure."
            }
          ]
      }
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/HelloWorld-2979ba79-b08f-495d-9ee6-46397c95ba13?x-amz-security-token=AQoDYXdzEDoa8AMR6t8h66eOXhN3%2Fx7XpuRxvf7pVn7IuWV4cEmwx0CtZT6yxCJ1%2BWmigYXqGoyQHuBYOWnxbhmwEcTg839qMuhSu1fk0fXpXf0oJOLkhKMudNqhdElyFQpzyT6Q8GDfhAsfbX9wvwCDTty4imxz7MczF%2FQl6tgvTYdip08ap5fAyrknZGV1%2B1Ggnp5w6JOjydYxuUsWwhoxoEWzi7SoVTmpRQQA91c4VW9lNotOAHACFxo6klzDPM8mxR9RJl66WxFugL0wQJyLUpmtjS9XoArD86sEWWiIccMpV2BQipTPQlzL%2F1Hoy%2BDF6QUxyPUihlDjPBoJTISTP8W1wxmzW%2BLbilAfFQRPY7CFjzR0k%2FA%2FIX5x9iyz52Pu1Q0ASTw1l%2Fq%2Fo3pRbvzWR79QS%2BpxXrwbYzoQHKiK62DSTsQo5tqKPsiDCYzrPxbq8lm7pNBPG%2FsxjePRWBVJeRl08WxEjSjoRRwBOPX5mz1BCUoUBPGG5tEENp87A%2FCdDgibFWM5DdYhwtaYPY7FTmi8DvqjQHL9jOmP8YuVteBTBcv8nFW6UbErPjwwn79FKG1u5M9HoTWUqUMBByz6D4tTRSEw6iJU7XdCujFnhnHe5V8imZ1KGI7fDWpciJhrhml0wnKPCK%2Fe9lK1P2kO7ldSWc7zn5hcIOD2tbEF&AWSAccessKeyId=ASIAJFVALOKV5SJVYPPA&Expires=1445825978&Signature=bvwu1Ny34LgTmZeOO3q4sn7x3Fg%3D"
        },
        "Configuration": {
          "Version": "$LATEST",
          "CodeSha256": "WnGd6iPBS0rGCJor4zyuOaGBtzQ3I/OgHerXWqZzbL8=",
          "FunctionName": "canary-20160425",
          "MemorySize": 128,
          "CodeSize": 350,
          "FunctionArn": "arn:aws:lambda:ap-northeast-1:XXXXXXXXXXXX:function:canary-20160425",
          "Handler": "canary-20160425.lambda_handler",
          "Role": "arn:aws:iam::XXXXXXXXXXXX:role/lambdaBasicExecution",
          "Timeout": 3,
          "LastModified": "2015-10-26T02:08:11.949+0000",
          "Runtime": "python2.7",
          "Description": "Performs a periodic check of the given site, erroring out on test failure."
        }
      }
コマンド
aws lambda get-function-configuration \
  --function-name ${LAMBDA_FUNC_NAME}
結果(例)

      {
        "CodeSha256": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx=",
        "FunctionName": "canary-20160425",
        "CodeSize": 350,
        "MemorySize": 128,
        "FunctionArn": "arn:aws:lambda:ap-northeast-1:XXXXXXXXXXXX:function:canary-20160425",
        "Version": "$LATEST",
        "Role": "arn:aws:iam::XXXXXXXXXXXX:role/lambdaBasicExecution",
        "Timeout": 3,
        "LastModified": "2015-10-26T01:23:45.678+0000",
        "Handler": "canary-20160425.lambda_handler",
        "Runtime": "nodejs",
        "Description": "Performs a periodic check of the given site, erroring out on test failure."
      }

3. Lambda関数の動作確認

3.1. サンプルデータの作成

変数の設定
FILE_INPUT="${LAMBDA_FUNC_NAME}-data.json" \
    && echo ${FILE_INPUT}
コマンド
cat << EOF > ${FILE_INPUT}
{
  "account": "123456789012",
  "region": "${AWS_DEFAULT_REGION}",
  "detail": {},
  "detail-type": "Scheduled Event",
  "source": "aws.events",
  "time": "1970-01-01T00:00:00Z",
  "id": "cdc73f9d-aea9-11e3-9d5a-835b769c0d9c",
  "resources": [
    "arn:aws:events:${AWS_DEFAULT_REGION}:123456789012:rule/my-schedule"
  ]
}
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。

3.2. lambda関数の手動実行

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

3.3. lambda関数の実行結果の確認

コマンド
cat ${FILE_OUTPUT_LAMBDA}
結果(例)
1970-01-01T00:00:00Z

3.4. lambda関数のログの確認

コマンド
cat ${FILE_LOG_LAMBDA} \
  | jp.py 'LogResult' \
  | sed 's/"//g' \
  | base64 --decode
結果(例)
START RequestId: 932b5962-0ac7-11e6-8702-2d4debfa833c Version: $LATEST
Checking https://www.amazon.com/ at 1970-01-01T00:00:00Z...
Check passed!
Check complete at 2016-04-25 09:24:57.698355
END RequestId: 932b5962-0ac7-11e6-8702-2d4debfa833c
REPORT RequestId: 932b5962-0ac7-11e6-8702-2d4debfa833c  Duration: 951.16 ms Billed Duration: 1000 ms    Memory Size: 128 MB Max Memory Used: 17 MB  

完了

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