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main.go
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main.go
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// Copyright 2017 The Prometheus 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.
// The main package for the Prometheus server executable.
package main
import (
_ "net/http/pprof"
"os"
"os/signal"
"syscall"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/imdario/mergo"
"github.com/prometheus/common/promlog"
"github.com/prometheus/common/version"
"github.com/criteo/graphite-remote-adapter/config"
"github.com/criteo/graphite-remote-adapter/web"
)
func reload(cliCfg *config.Config, logger log.Logger) (*config.Config, error) {
cfg := &config.DefaultConfig
// Parse config file if needed
if cliCfg.ConfigFile != "" {
fileCfg, err := config.LoadFile(logger, cliCfg.ConfigFile)
if err != nil {
level.Error(logger).Log("err", err, "msg", "Error loading config file")
return nil, err
}
cfg = fileCfg
}
// Merge overwritting cliCfg into cfg
if err := mergo.MergeWithOverwrite(cfg, cliCfg); err != nil {
level.Error(logger).Log("err", err, "msg", "Error merging config file with flags")
return nil, err
}
if cliCfg.Read.Delay == 0 {
cfg.Read.Delay = cliCfg.Read.Delay
}
if cliCfg.Read.Timeout == 0 {
cfg.Read.Timeout = cliCfg.Read.Timeout
}
if cliCfg.Write.Timeout == 0 {
cfg.Write.Timeout = cliCfg.Write.Timeout
}
return cfg, nil
}
func main() {
cliCfg := config.ParseCommandLine()
logger := promlog.New(&promlog.Config{Level: &cliCfg.LogLevel, Format: &promlog.AllowedFormat{}})
level.Info(logger).Log("msg", "Starting graphite-remote-adapter", "version", version.Info())
level.Info(logger).Log("build_context", version.BuildContext())
// Load the config once.
cfg, err := reload(cliCfg, logger)
if err != nil {
level.Error(logger).Log("err", err, "msg", "Error first loading config")
return
}
webHandler := web.New(log.With(logger, "component", "web"), cfg)
if err := webHandler.ApplyConfig(cfg); err != nil {
level.Error(logger).Log("err", err, "msg", "Error applying webHandler config")
return
}
// Tooling to dynamically reload the config for each clients.
hup := make(chan os.Signal)
signal.Notify(hup, syscall.SIGHUP)
go func() {
for {
select {
case <-hup:
cfg, err := reload(cliCfg, logger)
if err != nil {
level.Error(logger).Log("err", err, "msg", "Error reloading config")
continue
}
if err := webHandler.ApplyConfig(cfg); err != nil {
level.Error(logger).Log("err", err, "msg", "Error applying webHandler config")
continue
}
level.Info(logger).Log("msg", "Reloaded config file")
case rc := <-webHandler.Reload():
cfg, err := reload(cliCfg, logger)
if err != nil {
level.Error(logger).Log("err", err, "msg", "Error reloading config")
rc <- err
} else if err := webHandler.ApplyConfig(cfg); err != nil {
level.Error(logger).Log("err", err, "msg", "Error applying webHandler config")
rc <- err
} else {
level.Info(logger).Log("msg", "Reloaded config file")
rc <- nil
}
}
}
}()
err = webHandler.Run()
if err != nil {
level.Warn(logger).Log("err", err)
}
level.Info(logger).Log("msg", "See you next time!")
}