如何通过BW Agent的REST API获取应用执行及节点追踪日志？

Absolutely! You can definitely pull both application execution trace logs and node-specific trace logs via the BW Agent REST API. Here's a straightforward breakdown of how to implement both:

First, make sure your BW Agent is up and running, and you have the necessary API access permissions (usually a valid auth token).

API Endpoint & Method #

Use a GET request against the following endpoint:

/api/v1/traces/applications/{appId}

Replace {appId} with the unique ID of your target application.

Key Query Parameters #

• startTime: Timestamp (ISO 8601 format, e.g., 2024-05-20T00:00:00Z) to define the start of your log range.
• endTime: Timestamp marking the end of your log range.
• executionId (optional): Filter logs to a specific application execution instance if you only care about one run.
• logLevel (optional): Narrow results to a specific level like DEBUG, INFO, ERROR, or WARN.

Example Request (curl) #

curl -X GET "http://<bw-agent-host>:<port>/api/v1/traces/applications/my-app-123?startTime=2024-05-20T00:00:00Z&endTime=2024-05-20T12:00:00Z&logLevel=DEBUG" \
-H "Authorization: Bearer your-auth-token-here"

Response Overview #

The response will return a JSON array of trace entries, each containing:

• traceId: Unique identifier for the entire execution trace
• spans: List of individual execution steps (each with their own start/end times, logs, and metadata)
• applicationId: The target app ID
• timestamp: When the log entry was generated

To get logs specific to a particular node within your application, you can use a node-targeted endpoint, which lets you isolate logs from a single instance or component.

API Endpoint & Method #

Use a GET request against:

/api/v1/traces/applications/{appId}/nodes/{nodeId}

Replace {appId} with your app's ID and {nodeId} with the unique ID of the target node (you can get node IDs via the BW Agent's application metadata API if needed).

Key Query Parameters #

Same core parameters as above (startTime, endTime, logLevel), plus:

• serviceName (optional): Filter logs to a specific service running on the node.

Example Request (curl) #

curl -X GET "http://<bw-agent-host>:<port>/api/v1/traces/applications/my-app-123/nodes/node-456?startTime=2024-05-20T00:00:00Z&endTime=2024-05-20T12:00:00Z&logLevel=ERROR" \
-H "Authorization: Bearer your-auth-token-here"

Response Overview #

The response will be similar to the application-level trace, but filtered exclusively to logs generated by the specified node. You'll get details like node-specific span IDs, resource usage logs, and component-specific execution steps.

Quick Tips #

• If you don't know your appId or nodeId, you can fetch a list of applications and their nodes using the GET /api/v1/applications endpoint.
• For large result sets, use the pageSize and pageNumber parameters to paginate results and avoid timeouts.

内容的提问来源于stack exchange，提问作者Anouar BAKRI