[JAWS-UG CLI] Lambda:#14 Hello World (Python版)


前提条件
========


Lambdaへの権限
--------------

Lambdaに対してフル権限があること。


CloudWatchへの権限 (任意)
-------------------------

CloudWatchに対してRead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 1.10.19

```bash:コマンド:
aws --version
```

```text: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。

```bash:変数の設定:
IAM_ROLE_NAME='lambdaBasicExecution'
```

```bash:コマンド:
aws iam get-role \
   --role-name ${IAM_ROLE_NAME}
```

```json: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"
          }
      }
```


0. 準備
=======


0.1. 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。

```bash:変数の確認:
aws configure list
```

```text: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
```

1. 事前作業
===========

1.1. IAM RoleのARN取得
----------------------

```bash:変数の設定:
IAM_ROLE_NAME='lambdaBasicExecution'
```

```bash: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}
```

```text:結果(例):

      arn:aws:iam::XXXXXXXXXXXX:role/lambdaBasicExecution
```





1.2. Lambda関数名の決定
-----------------------

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

同名のLambda関数の不存在確認

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

```text:結果(例):

      A client error (ResourceNotFoundException) occurred when calling the GetFunction operation: Function not found: arn:aws:lambda:ap-northeast-1:XXXXXXXXXXXX:function:HelloWorld-20160425
```


1.2. Lambda関数
---------------

```bash:変数の設定:
FILE_LAMBDA_FUNC="${LAMBDA_FUNC_NAME}.py"
PY_FUNC_NAME='helloworld_handler'
```

```bash:変数の確認:
cat << ETX

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

ETX
```

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

import json

print('Loading function')


def ${PY_FUNC_NAME}(event, context):
    #print("Received event: " + json.dumps(event, indent=2))
    print("value1 = " + event['key1'])
    print("value2 = " + event['key2'])
    print("value3 = " + event['key3'])
    return event['key1']  # Echo back the first key value
    #raise Exception('Something went wrong')
EOF

cat ${FILE_LAMBDA_FUNC}
```

```bash:コマンド:
zip ${LAMBDA_FUNC_NAME}.zip ${FILE_LAMBDA_FUNC}
```

```text:結果(例):

      adding: HelloWorld-20160425.py (deflated 43%)
```


2. Lambda関数の作成
===================

```bash:変数の設定:
LAMBDA_FUNC_DESC='A starter AWS Lambda function.'
LAMBDA_RUNTIME='python2.7'
LAMBDA_HANDLER="${LAMBDA_FUNC_NAME}.${PY_FUNC_NAME}"
FILE_LAMBDA_ZIP="${LAMBDA_FUNC_NAME}.zip"
```

```bash: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
```

```bash: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}
```

```json:結果(例):

      {
        "CodeSha256": "WnGd6iPBS0rGCJor4zyuOaGBtzQ3I/OgHerXWqZzbL8=",
        "FunctionName": "HelloWorld-20160425",
        "CodeSize": 350,
        "MemorySize": 128,
        "FunctionArn": "arn:aws:lambda:ap-northeast-1:XXXXXXXXXXXX:function:HelloWorld-20160425",
        "Version": "$LATEST",
        "Role": "arn:aws:iam::XXXXXXXXXXXX:role/lambdaBasicExecution",
        "Timeout": 3,
        "LastModified": "2015-10-26T02:08:11.949+0000",
        "Handler": "HelloWorld-20160425.helloworld_handler",
        "Runtime": "python2.7",
        "Description": "A starter AWS Lambda function."
      }
```

```bash:コマンド:
aws lambda list-functions 
```

```json:結果(例):

      {
          "Functions": [
            {
                "Version": "$LATEST",
                "CodeSha256": "WnGd6iPBS0rGCJor4zyuOaGBtzQ3I/OgHerXWqZzbL8=",
                "FunctionName": "HelloWorld-20160425",
                "MemorySize": 128,
                "CodeSize": 350,
                "FunctionArn": "arn:aws:lambda:ap-northeast-1:XXXXXXXXXXXX:function:HelloWorld-20160425",
                "Handler": "HelloWorld-20160425.helloworld_handler",
                "Role": "arn:aws:iam::XXXXXXXXXXXX:role/lambdaBasicExecution",
                "Timeout": 3,
                "LastModified": "4月 25, 2016T02:08:11.949+0000",
                "Runtime": "python2.7",
                "Description": "A starter AWS Lambda function."
            }
          ]
      }
```

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

```json: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": "HelloWorld-20160425",
          "MemorySize": 128,
          "CodeSize": 350,
          "FunctionArn": "arn:aws:lambda:ap-northeast-1:XXXXXXXXXXXX:function:HelloWorld-20160425",
          "Handler": "HelloWorld-20160425.helloworld_handler",
          "Role": "arn:aws:iam::XXXXXXXXXXXX:role/lambdaBasicExecution",
          "Timeout": 3,
          "LastModified": "2015-10-26T02:08:11.949+0000",
          "Runtime": "python2.7",
          "Description": "A starter AWS Lambda function."
        }
      }
```

```bash:コマンド:
aws lambda get-function-configuration \
  --function-name ${LAMBDA_FUNC_NAME}
```

```json:結果(例):

      {
        "CodeSha256": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx=",
        "FunctionName": "HelloWorld-20160425",
        "CodeSize": 350,
        "MemorySize": 128,
        "FunctionArn": "arn:aws:lambda:ap-northeast-1:XXXXXXXXXXXX:function:HelloWorld-20160425",
        "Version": "$LATEST",
        "Role": "arn:aws:iam::XXXXXXXXXXXX:role/lambdaBasicExecution",
        "Timeout": 3,
        "LastModified": "2015-10-26T01:23:45.678+0000",
        "Handler": "HelloWorld-20160425.helloworld_handler",
        "Runtime": "nodejs",
        "Description": "A starter AWS Lambda function."
      }
```


3. Lambda関数の動作確認
=======================


3.1. サンプルデータの作成
-------------------------

```bash:変数の設定:
FILE_INPUT="${LAMBDA_FUNC_NAME}-data.json" \
    && echo ${FILE_INPUT}
```

```bash:コマンド:
cat << EOF > ${FILE_INPUT}
{
      "key1": "val1",
      "key2": "val2",
      "key3": "val3"
}
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。

```bash: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
-------------------------

```bash: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"
```

```bash: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
```

```bash: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}
```

```bash:コマンド:
cat ${FILE_LOG_LAMBDA} \
  | jp.py 'StatusCode'
```

```text:結果(例):

      200
```


3.3. lambda関数の実行結果の確認
-------------------------------

```bash:コマンド:
cat ${FILE_OUTPUT_LAMBDA}
```

```text:結果(例):

      "val1"
```


3.4. lambda関数のログの確認
---------------------------

```bash:コマンド:
cat ${FILE_LOG_LAMBDA} \
  | jp.py 'LogResult' \
  | sed 's/"//g' \
  | base64 --decode
```

```text:結果(例):

      START RequestId: 91110974-0a90-11e6-a0e2-ad2ea27598da Version: $LATEST
      value1 = val1
      value2 = val2
      value3 = val3
      END RequestId: 91110974-0a90-11e6-a0e2-ad2ea27598da
      REPORT RequestId: 91110974-0a90-11e6-a0e2-ad2ea27598da      Duration: 0.39 ms       Billed Duration: 100 ms         Memory Size: 128 MB     Max Memory Used: 15 MB
            START RequestId: 37887883-7b87-11e5-9ffa-7548aec1bfac Version: $LATEST
```


完了
====