Logging Amazon Managed Blockchain API calls using AWS CloudTrail - Amazon Managed Blockchain (AMB)
Managed Blockchain information in CloudTrailUnderstanding log file entriesUsing CloudTrail to track Ethereum calls

Logging Amazon Managed Blockchain API calls using AWS CloudTrail

Amazon Managed Blockchain is integrated with AWS CloudTrail, a service that provides a record of actions taken by a user, role, or an AWS service in Managed Blockchain. CloudTrail captures all API calls for Managed Blockchain as events. The calls captured include calls from the Managed Blockchain console and code calls to the Managed Blockchain API operations.

If you create a trail, you can enable continuous delivery of CloudTrail events to an Amazon S3 bucket, including events for Managed Blockchain. If you don't configure a trail, you can still view the most recent events in the CloudTrail console in Event history. Using the information that's collected by CloudTrail, you can determine the request that was made to Managed Blockchain, the IP address that the request was made from, who made the request, when it was made, and other additional details.

To learn more about CloudTrail, see the AWS CloudTrail User Guide.

Managed Blockchain information in CloudTrail

CloudTrail is enabled on your AWS account when you create the account. When activity occurs in Managed Blockchain, that activity is recorded in a CloudTrail event along with other AWS service events in Event history. You can view, search, and download recent events in your AWS account. For more information, see Viewing events with CloudTrail Event history.

For an ongoing record of events in your AWS account, including events for Managed Blockchain, create a trail. A trail enables CloudTrail to deliver log files to an Amazon S3 bucket. By default, when you create a trail in the console, the trail applies to all AWS Regions that Amazon Managed Blockchain is available in. The trail logs events from all the Regions in the AWS partition and delivers the log files to the S3 bucket that you specify. Additionally, you can configure other AWS services to further analyze and act on the event data that's collected in CloudTrail logs. For more information, see the following:

All your Managed Blockchain actions are logged as management events by CloudTrail and are documented in the Amazon Managed Blockchain API Reference. For example, calls to the CreateNode, GetNode and DeleteNetwork actions generate entries in the CloudTrail log files.

Every event or log entry contains information about who generated the request. You can use the identity information to determine the following:

  • Whether the request was made with root or AWS Identity and Access Management (IAM) user credentials.

  • Whether the request was made with temporary security credentials for a role or federated user.

  • Whether the request was made by another AWS service.

For more information, see the CloudTrail userIdentity element.

Understanding Managed Blockchain log file entries

A trail is a configuration that enables delivery of events as log files to an S3 bucket that you specify. Managed Blockchain supports logging management events. For more information, see Logging management events for trails in the AWS CloudTrail User Guide. Managed Blockchain also supports logging data events for Ethereum API calls over HTTP or WebSockets (JSON-RPC API only) connections. For more information, see Using CloudTrail to track Ethereum calls.

CloudTrail log files contain one or more log entries. An event represents a single request from any source. It includes information about the requested action, the date and time of the action, and request parameters. CloudTrail log files aren't an ordered stack trace of the public API calls. This way, they don't appear in any specific order.

Example – Management event log entry

The following example shows a CloudTrail management event log entry that demonstrates the GetNode action.

{
  "eventVersion": "1.05",
  "userIdentity": {
    "type": "AssumedRole",
    "principalId": "ABCD1EF23G4EXAMPLE56:carlossalazar",
    "arn": "arn:aws:sts::111122223333:assumed-role/Admin/carlossalazar",
    "accountId": "111122223333",
    "accessKeyId": "AKIAIOSFODNN7EXAMPLE",
      "webIdFederationData": {},
      "attributes": {
        "mfaAuthenticated": "false",
        "creationDate": "2020-12-10T05:36:38Z"
      }
    }
  },
  "eventTime": "2020-12-10T05:50:48Z",
  "eventSource": "managedblockchain.amazonaws.com",
  "eventName": "GetNode",
  "awsRegion": "us-east-1",
  "sourceIPAddress": "198.51.100.1",
  "userAgent": "aws-cli/2.0.7 Python/3.7.3 Linux/5.4.58-37.125.amzn2int.x86_64 botocore/2.0.0dev11",
  "requestParameters": {
    "networkId": "n-ethereum-mainnet",
    "nodeId": "nd-6EAJ5VA43JGGNPXOUZP7Y47E4Y"
  },
  "responseElements": null,
  "requestID": "1e2xa3m4-56p7-8l9e-0ex1-23456a78m90p",
  "eventID": "ex12345a-m678-901p-23e4-567ex8a9mple",
  "readOnly": true,
  "eventType": "AwsApiCall",
  "recipientAccountId": "111122223333"
}

Using CloudTrail to track Ethereum calls

You can track Ethereum API as data events using CloudTrail. By default, when you create a trail, data events aren't logged. To record Ethereum API calls as CloudTrail data events, you must explicitly add the supported resources or resource types that you want to collect activity to a trail for. Amazon Managed Blockchain supports adding data events using the AWS CLI. For more information, see Log events by using advanced selectors in the AWS CloudTrail User Guide.

To log data events for a trail, run the put-event-selectors command after you create the trail. Use the --advanced-event-selectors option to specify the data events to log. The following example demonstrates a put-event-selectors command that logs all Ethereum API calls for a trail that's named my-ethereum-trail in the us-east-1 Region.

aws cloudtrail put-event-selectors \
--region us-east-1 \
--trail-name my-ethereum-trail \
--advanced-event-selectors '[{
    "Name": "MyDataEventSelectorForEtherumJsonRpcCalls",
    "FieldSelectors": [
      { "Field": "eventCategory", "Equals": ["Data"] },
      { "Field": "resources.type", "Equals": ["AWS::ManagedBlockchain::Node"] } ]}]'
Example Data event log entry for an Ethereum JSON-RPC API call

The following example demonstrates a CloudTrail data event log entry for an Ethereum JSON-RPC API all, web3_clientVersion, from a client to a node in Amazon Managed Blockchain.

{
  "eventVersion": "1.05",
  "userIdentity": {
    "type": "AssumedRole",
    "principalId": "ABCD1EF23G4EXAMPLE56:carlossalazar",
    "arn": "arn:aws:sts::111122223333:assumed-role/Admin/carlossalazar",
    "accountId": "111122223333",
    "accessKeyId": "AKIAIOSFODNN7EXAMPLE",
      "webIdFederationData": {},
      "attributes": {
        "mfaAuthenticated": "false",
        "creationDate": "2020-12-11T16:51:12Z"
      }
    }
  },
  "eventTime": "2020-12-11T19:56:36Z",
  "eventSource": "managedblockchain.amazonaws.com",
  "eventName": "web3_clientVersion",
  "awsRegion": "us-east-1",
  "sourceIPAddress": "198.51.100.1",
  "userAgent": "python-requests/2.23.0",
  "requestParameters": {
    "id": 67,
    "jsonrpc": "2.0",
    "method": "web3_clientVersion",
    "params": []
  },
  "responseElements": {
    "result": "Geth/v1.9.24-stable-cc05b050/linux-amd64/go1.15.5",
    "id": 67,
    "jsonrpc": "2.0"
  },
  "requestID": "1e2xa3m4-56p7-8l9e-0ex1-23456a78m90p",
  "eventID": "ex12345a-m678-901p-23e4-567ex8a9mple",
  "readOnly": false,
  "eventType": "AwsApiCall",
  "recipientAccountId": "111122223333"
}