/
pprofextension.go
81 lines (68 loc) · 1.97 KB
/
pprofextension.go
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// Copyright The OpenTelemetry Authors
//
// 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 pprofextension
import (
"context"
"net"
"net/http"
_ "net/http/pprof" // #nosec Needed to enable the performance profiler
"os"
"runtime"
"runtime/pprof"
"go.uber.org/zap"
"go.opentelemetry.io/collector/component"
)
type pprofExtension struct {
config Config
logger *zap.Logger
server http.Server
}
func (p *pprofExtension) Start(ctx context.Context, host component.Host) error {
// Start the listener here so we can have earlier failure if port is
// already in use.
ln, err := net.Listen("tcp", p.config.Endpoint)
if err != nil {
return err
}
runtime.SetBlockProfileRate(p.config.BlockProfileFraction)
runtime.SetMutexProfileFraction(p.config.MutexProfileFraction)
p.logger.Info("Starting net/http/pprof server", zap.Any("config", p.config))
go func() {
// The listener ownership goes to the server.
if err := p.server.Serve(ln); err != nil && err != http.ErrServerClosed {
host.ReportFatalError(err)
}
}()
if p.config.SaveToFile != "" {
f, err := os.Create(p.config.SaveToFile)
if err != nil {
return err
}
pprof.StartCPUProfile(f)
}
return nil
}
func (p *pprofExtension) Shutdown(context.Context) error {
if p.config.SaveToFile != "" {
pprof.StopCPUProfile()
}
return p.server.Close()
}
func newServer(config Config, logger *zap.Logger) (*pprofExtension, error) {
p := &pprofExtension{
config: config,
logger: logger,
}
return p, nil
}