How to Achieve Efficient Trace Logging in Go with Optimized Performance for Suspended Statements?

Trace Logging in Go with Optimized Performance for Suspended Statements

In critical paths, leaving low-level debug/trace logging statements allows for runtime configuration to activate them as needed. This logging should have minimal impact on disabled statements, ideally limited to a boolean check.

In C/C , LOG macros evaluate only after checking a flag, calling a helper function only if enabled. How can Go achieve this?

Using io.Discard with log.Logger is ineffective, as log messages are fully formatted regardless of disabling.

One approach is creating an EnabledLogger with an Enabled flag and delegate log.Logger to handle logging. This addresses formatting, but evaluates arguments regardless of enablement.

To defer argument evaluation, consider using Stringify wrappers for complex values. However, this approach remains verbose and prone to errors.

Alternatively, manually check for enablement before logging. This is more concise but requires discipline to avoid oversights.

Ultimately, Go's strict evaluation of arguments limits options. While not perfect for runtime configurability, the following patterns are viable:

• Implement fmt.Stringer: Delay formatting complex arguments by implementing custom String() methods.
• Swap Out Logger: Replace the logger interface at runtime or during build time to optimize disabled statements.
• Use Logger Bool Pattern: Set the logger as a bool for concise enablement checks.
• Code Generation: Apply code generation to preprocess statements and eliminate unnecessary evaluation.

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