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monitoring.go
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monitoring.go
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package monitoring
import (
"code.cloudfoundry.org/lager"
"fmt"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/timotto/ardumower-relay/internal/util"
"net"
"net/http"
"sync"
)
type monitoring struct {
logger lager.Logger
param Parameters
listen net.Listener
wg *sync.WaitGroup
}
func NewMonitoring(logger lager.Logger, param Parameters) *monitoring {
return &monitoring{
logger: logger.Session("monitoring"),
param: param,
wg: &sync.WaitGroup{},
}
}
func (m *monitoring) Start(errs *util.AsyncErr) error {
if !m.param.Enabled {
return nil
}
var err error
if m.listen, err = net.Listen("tcp", m.param.Address); err != nil {
return fmt.Errorf("failed to listen at %v: %w", m.param.Address, err)
}
m.wg.Add(1)
errs.AddWriter()
go func() {
defer errs.WriterDone()
defer m.wg.Done()
mux := http.NewServeMux()
mux.Handle("/metrics", promhttp.Handler())
if err := http.Serve(m.listen, mux); err != nil {
errs.C <- fmt.Errorf("monitoring server failed: %w", err)
}
}()
m.logger.Info("started", lager.Data{"address": m.listen.Addr().String()})
return nil
}
func (m *monitoring) Stop() {
if m.listen != nil {
_ = m.listen.Close()
}
m.wg.Wait()
}
func (m *monitoring) Address() string {
if m.listen != nil {
return m.listen.Addr().String()
}
return ""
}