how can i log tasklocal data?

To log task-local data in Swift, you can use the SwiftLog library, which supports structured logging by adding metadata to log messages. This provides additional context when troubleshooting problems. Here’s a brief overview of how you can achieve this:

Emit a Log: Use SwiftLog to emit a log when you start handling a new request. This can be done by adding metadata to your log messages.
Add Counters: You can use SwiftMetrics to add a counter that increments on each request to track how many requests your service has processed.
Distributed Tracing: Add Swift distributed tracing to create a span around your database query. This helps in troubleshooting a request end-to-end through your system.
Bootstrapping: Ensure you bootstrap your logging system first, followed by your metric system, and lastly your instrumentation system. This order is recommended because metrics and instrumentation systems might want to emit logs about their status.

Here’s a snippet of how you might instrument a method with logging, metrics, and tracing:

import SwiftLog
import SwiftMetrics
import SwiftDistributedTracing

func handleRequest() {
    // Emit a log
    logger.info("Handling new request", metadata: ["requestID": "\(UUID())"])
    
    // Increment a counter
    requestCounter.increment()
    
    // Create a span for distributed tracing
    let span = tracer.startSpan("databaseQuery")
    defer { span.end() }
    
    // Your database query logic here
}

For more detailed information, you can refer to the session Explore the Swift on Server ecosystem.

Relevant Sessions

If you need more specific details or examples, feel free to ask!