99 lines
2.4 KiB
Go
99 lines
2.4 KiB
Go
// Copyright 2016 The Chihaya Authors. All rights reserved.
|
|
// Use of this source code is governed by the BSD 2-Clause license,
|
|
// which can be found in the LICENSE file.
|
|
|
|
// Package prometheus implements a chihaya Server for serving metrics to
|
|
// Prometheus.
|
|
package prometheus
|
|
|
|
import (
|
|
"errors"
|
|
"log"
|
|
"net"
|
|
"net/http"
|
|
"time"
|
|
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
"github.com/tylerb/graceful"
|
|
"gopkg.in/yaml.v2"
|
|
|
|
"github.com/chihaya/chihaya"
|
|
"github.com/chihaya/chihaya/server"
|
|
"github.com/chihaya/chihaya/tracker"
|
|
)
|
|
|
|
func init() {
|
|
server.Register("prometheus", constructor)
|
|
}
|
|
|
|
func constructor(srvcfg *chihaya.ServerConfig, tkr *tracker.Tracker) (server.Server, error) {
|
|
cfg, err := NewServerConfig(srvcfg)
|
|
if err != nil {
|
|
return nil, errors.New("prometheus: invalid config: " + err.Error())
|
|
}
|
|
|
|
return &Server{
|
|
cfg: cfg,
|
|
}, nil
|
|
}
|
|
|
|
// ServerConfig represents the configuration options for a
|
|
// PrometheusServer.
|
|
type ServerConfig struct {
|
|
Addr string `yaml:"addr"`
|
|
ShutdownTimeout time.Duration `yaml:"shutdown_timeout"`
|
|
ReadTimeout time.Duration `yaml:"read_timeout"`
|
|
WriteTimeout time.Duration `yaml:"write_timeout"`
|
|
}
|
|
|
|
// NewServerConfig marshals a chihaya.ServerConfig and unmarshals it
|
|
// into a more specific prometheus ServerConfig.
|
|
func NewServerConfig(srvcfg *chihaya.ServerConfig) (*ServerConfig, error) {
|
|
bytes, err := yaml.Marshal(srvcfg.Config)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
var cfg ServerConfig
|
|
err = yaml.Unmarshal(bytes, &cfg)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &cfg, nil
|
|
}
|
|
|
|
// Server implements a chihaya Server for serving metrics to Prometheus.
|
|
type Server struct {
|
|
cfg *ServerConfig
|
|
grace *graceful.Server
|
|
}
|
|
|
|
var _ server.Server = &Server{}
|
|
|
|
func (s *Server) Start() {
|
|
s.grace = &graceful.Server{
|
|
Server: &http.Server{
|
|
Addr: s.cfg.Addr,
|
|
Handler: prometheus.Handler(),
|
|
ReadTimeout: s.cfg.ReadTimeout,
|
|
WriteTimeout: s.cfg.WriteTimeout,
|
|
},
|
|
Timeout: s.cfg.ShutdownTimeout,
|
|
NoSignalHandling: true,
|
|
}
|
|
|
|
if err := s.grace.ListenAndServe(); err != nil {
|
|
if opErr, ok := err.(*net.OpError); !ok || (ok && opErr.Op != "accept") {
|
|
log.Printf("Failed to gracefully run Prometheus server: %s", err.Error())
|
|
panic(err)
|
|
}
|
|
}
|
|
|
|
log.Println("Prometheus server shut down cleanly")
|
|
}
|
|
|
|
func (s *Server) Stop() {
|
|
s.grace.Stop(s.cfg.ShutdownTimeout)
|
|
<-s.grace.StopChan()
|
|
}
|