cpu.go

// Copyright (c) 2019 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

package debug

import (
	"io"
	"net/http"
	"runtime/pprof"
	"time"
)

type cpuProfileSource struct {
	duration time.Duration
}

// NewCPUProfileSource returns a Source for CPU Profiling, measured
// over the passed duration.
func NewCPUProfileSource(h time.Duration) Source {
	return &cpuProfileSource{duration: h}
}

func (c *cpuProfileSource) Write(w io.Writer, _ *http.Request) error {
	if err := pprof.StartCPUProfile(w); err != nil {
		return err
	}

	time.Sleep(c.duration)
	pprof.StopCPUProfile()

	return nil
}