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2a3a79652c
Wire up Go's standard profiling toolkit so it's automatically available in dev builds and completely absent from production. The profiling package uses build tags (dev/!dev) to eliminate all pprof, trace, and timing code from release binaries with zero new dependencies. - backend/profiling: pprof HTTP server on :6060, /debug/trace endpoint, block/mutex profiling, and TimeOp helper for structured operation timing - scripts/profile.sh: interactive menu-driven script that auto-selects free ports (8080-8089) so multiple profiles can be open simultaneously - Instrumented key operations: app init, database init, player load/restore, queue set/restore - Makefile targets: profile, profile-cpu, profile-heap, profile-trace - .gitignore: exclude trace-*.out and *.pprof artifacts
30 lines
646 B
Go
30 lines
646 B
Go
//go:build dev
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package profiling
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import (
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"log/slog"
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"time"
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)
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// TimeOp starts a timer and returns a function that, when called, logs the
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// elapsed duration. Intended for use with defer:
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//
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// defer profiling.TimeOp(logger, "database.Init")()
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//
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// The extra () is required — defer evaluates the outer call immediately
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// (capturing the start time) and defers the returned closure.
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func TimeOp(logger *slog.Logger, operation string) func() {
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start := time.Now()
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logger.Debug("operation started", "op", operation)
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return func() {
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logger.Info(
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"operation completed",
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"op", operation,
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"duration", time.Since(start),
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)
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}
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}
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