Question 1

How does log compare to zap for Go logging?

Accepted Answer

Log emphasizes runtime configurability and handler flexibility, allowing dynamic level routing and integration with error libraries. In contrast, zap focuses on high performance and zero-allocation logging, making it better for latency-sensitive applications where overhead is a concern.

Question 2

How to write a custom handler for log to send logs to Elasticsearch?

Accepted Answer

Implement the Handler interface with a Log method that processes log entries, marshal them to JSON using the built-in handler or custom logic, and send to Elasticsearch via HTTP. The README provides an example for custom handlers, and you can register it with AddHandler for specific log levels.

Question 3

Can I change log levels at runtime with log?

Accepted Answer

Yes, log supports runtime configuration of log levels and handlers. You can dynamically add, remove, or modify handlers and the levels they handle without restarting the application, as demonstrated in the README's usage examples.

Question 4

Does log work with Go's context package for request-scoped logging?

Accepted Answer

Yes, log provides GetContext and SetContext helpers to manage request-scoped logging context. This allows easy addition of contextual fields like request IDs to log entries in web applications, enhancing traceability.

Question 5

What error libraries are compatible with log's WithError feature?

Accepted Answer

Log is optimized for go-playground/errors, enabling automatic extraction of wrapped errors and tags. For other libraries, you can use SetWithErrorFn to configure custom error handling, but this requires extra setup and may not offer the same depth of integration.

Question 6

How to redirect standard log and slog output to log?

Accepted Answer

Use RedirectGoStdLog for standard log output and the slog compatibility layer to redirect slog output. The README includes examples showing how to set this up, allowing seamless integration with Go's standard logging libraries.

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