hebilicious / edge-logger

OpenTelemetry aware logger for Edge Runtimes (Cloudflare Workers and Vercel Edge Functions)

Baselime Edge Logger

OpenTelemetry aware logger for Edge Runtimes.

Fully tested with:

• Cloudflare Workers
• Cloudflare Pages Functions
• Vercel Edge Functions

Usage

npm i @baselime/edge-logger

Example

import { BaselimeLogger } from '@baselime/edge-logger'

export interface Env {
  BASELIME_API_KEY: string
}

export default {
  async fetch(req: Request, env: Env, ctx: ExecutionContext): Promise<Response> {
    const logger = new BaselimeLogger({
      ctx,
      apiKey: env.BASELIME_API_KEY,
      service: 'my-service',
      dataset: 'cloudflare',
      namespace: 'my-worker-name',
      requestId: crypto.randomUUID(),
    })

    // Use the Baselime Edge logger to log
    logger.info('Hello, World!', { foo: 'bar' })

    // Make sure to add this to flush the logs to Baselime before the return statement
    ctx.waitUntil(logger.flush());
    return new Response('Request Completed');
  }
}

Note the ctx.waitUntil(logger.flush()); before the return statement of the function.

Supported Methods

logger.info("This is an informational message", { payload: { foo: "bar" } });
logger.warn("This is a warning message", { payload: { foo: "bar" } });
logger.error("This is an error message", { payload: { foo: "bar" } });

Local Development

To get logs appropriately formatted in your local development environment using wrangler, add the IS_LOCAL_MODE environment variable to your .dev.var file.

IS_LOCAL_MODE=1

And use it when configurting the BaselimeLogger.

export default {
  async fetch(req: Request, env: Env, ctx: ExecutionContext): Promise<Response> {
    const logger = new BaselimeLogger({
      ctx,
      apiKey: env.BASELIME_KEY,
      isLocalDev: env.IS_LOCAL_DEV
    })

    logger.info("Pretty Formatted Logs", { foo: "bar" });

    ctx.waitUntill(logger.flush())
  }
}

Local development mode is disabled by default to improve performance.

Configuration

The BaselimeLogger class takes the following configuration options

Property	Type	Description
ctx	ExecutionContext	Execution context
apiKey	string	API key for authentication
dataset	string (optional)	Dataset name
service	string (optional)	Service name
namespace	string (optional)	Namespace
flushAfterMs	number (optional)	Wait time to flush the logs to Baselime
flushAfterLogs	number (optional)	Threshold number of logs to flush
requestId	string (optional)	Request ID
isLocalDev	boolean (optional)	Indicates if it's for local development

Contributor Alumni

The Baselime Edge Logger was created for the Baselime community and generously offered to Baselime by Jacob Hands.

Contributing

If you would like to contribute to the development of this library, please submit a pull request on GitHub.

License

This library is licensed under the MIT License. See the LICENSE file for details.