/
debug.go
99 lines (81 loc) · 1.93 KB
/
debug.go
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// Copyright (c) 2019 Cisco and/or its affiliates.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at:
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package debug
import (
_ "expvar"
"log"
"net/http"
_ "net/http/pprof"
"os"
"strings"
"github.com/pkg/profile"
)
const defaultServerAddr = ":1234"
var (
profileMode = os.Getenv("DEBUG_PROFILE_MODE")
profilePath = os.Getenv("DEBUG_PROFILE_PATH")
debugServerAddr = os.Getenv("DEBUG_SERVER_ADDR")
)
type Debug struct {
closer func()
}
func Start() interface {
Stop()
} {
var d Debug
d.runProfiling()
d.runServer()
return &d
}
func (d *Debug) Stop() {
if d.closer != nil {
d.closer()
}
}
func (d *Debug) runProfiling() {
var profiling func(*profile.Profile)
switch strings.ToLower(profileMode) {
case "cpu":
profiling = profile.CPUProfile
case "mem":
profiling = profile.MemProfile
case "mutex":
profiling = profile.MutexProfile
case "block":
profiling = profile.BlockProfile
case "trace":
profiling = profile.TraceProfile
default:
// do nothing
return
}
opts := []func(*profile.Profile){
profiling,
profile.ProfilePath(profilePath),
profile.NoShutdownHook,
}
d.closer = profile.Start(opts...).Stop
}
func (d *Debug) runServer() {
addr := debugServerAddr
if addr == "" {
addr = defaultServerAddr
}
log.Printf("debug server listening on: %s", addr)
go func() {
if err := http.ListenAndServe(addr, nil); err != nil {
log.Printf("debug server error: %v", err)
}
}()
}