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Logging Amazon API Gateway API Calls to Amazon Kinesis Data Firehose using CloudWatch Logs Subscription Filters

logging-api-calls-to-cloudwatch-logs

This is a CDK Python project for logging API calls to Amazon Kinesis Data Firehose using CloudWatch Logs subscription filters.

The cdk.json file tells the CDK Toolkit how to execute your app.

This project is set up like a standard Python project. The initialization process also creates a virtualenv within this project, stored under the .venv directory. To create the virtualenv it assumes that there is a python3 (or python for Windows) executable in your path with access to the venv package. If for any reason the automatic creation of the virtualenv fails, you can create the virtualenv manually.

To manually create a virtualenv on MacOS and Linux:

$ python3 -m venv .venv

After the init process completes and the virtualenv is created, you can use the following step to activate your virtualenv.

$ source .venv/bin/activate

If you are a Windows platform, you would activate the virtualenv like this:

% .venv\Scripts\activate.bat

Once the virtualenv is activated, you can install the required dependencies.

(.venv) $ pip install -r requirements.txt

At this point you can now synthesize the CloudFormation template for this code.

(.venv) $ export CDK_DEFAULT_ACCOUNT=$(aws sts get-caller-identity --query Account --output text)
(.venv) $ export CDK_DEFAULT_REGION=$(aws configure get region)
(.venv) $ cdk synth -c firehose_name={your-delivery-stream-name} --all

⚠️ The name of your Kinesis Data Firehose delivery stream MUST NOT start with amazon-apigateway- prefix. If your delivery stream name had amazon-apigateway- prefix, you would encounter the following error like this during deployment:

Resource handler returned message: "Could not deliver test message to specified Firehose stream. Check if the given Firehose stream is in ACTIVE state. (Service: CloudWatchLogs, Status Code: 400, Request ID: aaaa7f10-a5d6-44d5-8191-dba9f27d36f3)" (RequestToken: bb4b2fc5-26cd-de7b-a7d9-8653c44f8642, HandlerErrorCode: InternalFailure)

Use cdk deploy command to create the stack shown above,

(.venv) $ cdk deploy -c firehose_name={your-delivery-stream-name} --all

After deployment, you can find out the cloud watch log subscription filters with Amazon Kinesis Data Firehose by running the following instructions.

$ CW_LOG_GROUP_NAME=$(aws cloudformation describe-stacks --stack-name LoggingApiCallsToCloudwatchLogsStack  | jq -r '.Stacks[0].Outputs | map(select(.OutputKey == "RestApiAccessLogGroupName")) | .[0].OutputValue')
$ aws logs describe-subscription-filters --log-group-name ${CW_LOG_GROUP_NAME}
{
    "subscriptionFilters": [
        {
            "filterName": "LoggingApiCallsToCloudwatchLogsStack-CWLSubscriptionFilter-Zi6qt8IvfIJV",
            "logGroupName": "LoggingApiCallsToCloudwatchLogsStack-RandomGenApiLogs96EBA3FC-VV1l7d2OJqLV",
            "filterPattern": "",
            "destinationArn": "arn:aws:firehose:us-east-1:123456789012:deliverystream/PUT-S3-vvMmG",
            "roleArn": "arn:aws:iam::123456789012:role/CWLtoKinesisFirehoseRole",
            "distribution": "ByLogStream",
            "creationTime": 1670315295923
        }
    ]
}

To add additional dependencies, for example other CDK libraries, just add them to your setup.py file and rerun the pip install -r requirements.txt command.

Clean Up

Delete the CloudFormation stack by running the below command.

(.venv) $ cdk destroy --force --all

Useful commands

  • cdk ls list all stacks in the app
  • cdk synth emits the synthesized CloudFormation template
  • cdk deploy deploy this stack to your default AWS account/region
  • cdk diff compare deployed stack with current state
  • cdk docs open CDK documentation

Enjoy!

Run Test

  1. Invoke REST API method

    $ curl -X GET 'https://{your-api-gateway-id}.execute-api.{region}.amazonaws.com/prod/random/strings?len=7'

    The response is:

    ["weBJDKv"]

  2. Generate test requests and run them.

    $ cat <<EOF > run_test.sh
> curl 'https://{your-api-gateway-id}.execute-api.{region}.amazonaws.com/prod/random/strings?len=7'
> curl 'https://{your-api-gateway-id}.execute-api.{region}.amazonaws.com/prod/random/strings?chars=letters'
> curl 'https://{your-api-gateway-id}.execute-api.{region}.amazonaws.com/prod/random/strings?chars=letters&len=15'
> curl 'https://{your-api-gateway-id}.execute-api.{region}.amazonaws.com/prod/random/strings?chars=lowercase&len=15'
> curl 'https://{your-api-gateway-id}.execute-api.{region}.amazonaws.com/prod/random/strings?chars=uppercase&len=5'
> curl 'https://{your-api-gateway-id}.execute-api.{region}.amazonaws.com/prod/random/strings?chars=digits&len=7'
> curl 'https://{your-api-gateway-id}.execute-api.{region}.amazonaws.com/prod/random/strings?chars=digits&len=17'
> curl 'https://{your-api-gateway-id}.execute-api.{region}.amazonaws.com/prod/random/strings?len=3'
> curl 'https://{your-api-gateway-id}.execute-api.{region}.amazonaws.com/prod/random/strings?chars=letters&len=9'
> curl 'https://{your-api-gateway-id}.execute-api.{region}.amazonaws.com/prod/random/strings?len=17'
> EOF
$ bash ./run_test.sh

  3. Check the access logs in S3

    After 5~10 minutes, you can see that the cloud watch logs have been delivered by Kinesis Data Firehose to S3 and stored in a folder structure by year, month, day, and hour. amazon-apigatewy-access-log-in-s3

    The data in the Amazon S3 object is compressed with the gzip format. When you examine the raw data, you would see one of the following types of cloud watch logs:

    • Control Message

       {
    "messageType": "CONTROL_MESSAGE",
    "owner": "CloudwatchLogs",
    "logGroup": "",
    "logStream": "",
    "subscriptionFilters": [],
    "logEvents": [
       {
          "id": "",
          "timestamp": 1670315295923,
          "message": "CWL CONTROL MESSAGE: Checking health of destination Firehose."
       }
    ]
 }

    • Data Message

       {
    "messageType": "DATA_MESSAGE",
    "owner": "819320734790",
    "logGroup": "LoggingApiCallsToCloudwatchLogsStack-RandomGenApiLogs96EBA3FC-VV1l7d2OJqLV",
    "logStream": "a5f69e5c7656d84117661e8a24b04807",
    "subscriptionFilters": [
       "LoggingApiCallsToCloudwatchLogsStack-CWLSubscriptionFilter-Zi6qt8IvfIJV"
    ],
    "logEvents": [
       {
          "id": "37249425165417151864519688057747871138717457702689112064",
          "timestamp": 1670321993001,
          "message": "{\"requestId\": \"65401bed-607a-4b27-a33f-f1f5c811b1d2\", \"ip\": \"124.17.254.27\", \"user\": \"-\", \"requestTime\": 1670321993001, \"httpMethod\": \"GET\", \"resourcePath\": \"/random/strings\", \"status\": 200, \"protocol\": \"HTTP/1.1\", \"responseLength\": 11}\n"
       }
    ]
 }

    ℹ️ The api access logs are included in the logEvents attribute as string data type.

References