Method Start

internal/profiler/profiler.go:138–170

Start begins timing an operation and returns a function to complete the profiling

(ctx context.Context, operation string)

// Start begins timing an operation and returns a function to complete the profiling
func (p *Profiler) Start(ctx context.Context, operation string) func(lines int, bytes int64) *Profile {
	if !p.enabled {
		return func(int, int64) *Profile { return nil }
	}

	profile := &Profile{
		Operation: operation,
		Timestamp: time.Now(),
	}

	var memBefore runtime.MemStats
	runtime.ReadMemStats(&memBefore)
	profile.MemoryBefore = memBefore.Alloc

	start := time.Now()

	return func(lines int, bytes int64) *Profile {
		profile.Duration = time.Since(start)
		profile.LinesCount = lines
		profile.BytesCount = bytes

		var memAfter runtime.MemStats
		runtime.ReadMemStats(&memAfter)
		profile.MemoryAfter = memAfter.Alloc
		profile.MemoryDelta = safeMemoryDelta(memAfter.Alloc, memBefore.Alloc)

		if p.logger != nil {
			p.logger.InfoContext(ctx, "Performance profile", "profile", profile.String())
		}

		return profile
	}
}

var globalProfiler *Profiler