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main.go
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main.go
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// This file is part of Graylog.
//
// Graylog is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Graylog is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Graylog. If not, see <http://www.gnu.org/licenses/>.
package main
import (
"flag"
"fmt"
"os"
"path/filepath"
"runtime"
"github.com/kardianos/service"
"github.com/Graylog2/collector-sidecar/backends"
"github.com/Graylog2/collector-sidecar/cfgfile"
"github.com/Graylog2/collector-sidecar/common"
"github.com/Graylog2/collector-sidecar/context"
"github.com/Graylog2/collector-sidecar/daemon"
"github.com/Graylog2/collector-sidecar/services"
// importing backend packages to ensure init() is called
_ "github.com/Graylog2/collector-sidecar/backends/beats/filebeat"
_ "github.com/Graylog2/collector-sidecar/backends/beats/winlogbeat"
_ "github.com/Graylog2/collector-sidecar/backends/nxlog"
_ "github.com/Graylog2/collector-sidecar/daemon"
)
var (
log = common.Log()
printVersion *bool
serviceParam *string
configurationFile *string
)
func init() {
var configurationPath string
if runtime.GOOS == "windows" {
configurationPath = filepath.Join(os.Getenv("SystemDrive")+"\\", "Program Files", "graylog", "collector-sidecar", "collector_sidecar.yml")
} else {
configurationPath = filepath.Join("/etc", "graylog", "collector-sidecar", "collector_sidecar.yml")
}
serviceParam = flag.String("service", "", "Control the system service [start stop restart install uninstall]")
configurationFile = flag.String("c", configurationPath, "Configuration file")
printVersion = flag.Bool("version", false, "Print version and exit")
flag.Usage = func() {
fmt.Fprint(os.Stderr, "Usage: graylog-collector-sidecar -c [CONFIGURATION FILE]\n")
flag.PrintDefaults()
}
}
func main() {
if commandLineSetup() {
return
}
// setup system service
serviceConfig := &service.Config{
Name: daemon.Daemon.Name,
DisplayName: daemon.Daemon.DisplayName,
Description: daemon.Daemon.Description,
}
distributor := daemon.Daemon.NewDistributor()
s, err := service.New(distributor, serviceConfig)
if err != nil {
log.Fatalf("Operating system is not supported: %v", err)
}
distributor.BindToService(s)
if len(*serviceParam) != 0 {
services.ControlHandler(*serviceParam)
err := service.Control(s, *serviceParam)
if err != nil {
log.Errorf("Failed service action: %v", err)
}
return
}
// initialize application context
ctx := context.NewContext()
err = ctx.LoadConfig(configurationFile)
if err != nil {
log.Fatal("Loading configuration file failed.")
} else {
// Persist path for later reloads
cfgfile.SetConfigPath(*configurationFile)
}
if cfgfile.ValidateConfig() {
log.Info("Config OK")
return
}
backendSetup(ctx)
// start main loop
services.StartPeriodicals(ctx)
err = s.Run()
if err != nil {
log.Fatal(err)
}
}
func commandLineSetup() bool {
flag.Parse()
if *printVersion {
fmt.Printf("Graylog Collector Sidecar version %s (%s) [%s/%s]\n", common.CollectorVersion, common.GitRevision, runtime.Version(), runtime.GOARCH)
return true
}
if _, err := os.Stat(*configurationFile); os.IsNotExist(err) {
log.Fatal("Can not open collector-sidecar configuration " + *configurationFile)
}
return false
}
func backendSetup(context *context.Ctx) {
for _, collector := range context.UserConfig.Backends {
backendCreator, err := backends.GetCreator(collector.Name)
if err != nil {
log.Error("Unsupported collector backend found in configuration: " + collector.Name)
continue
}
backend := backendCreator(context)
backends.Store.AddBackend(backend)
if *collector.Enabled == true && backend.ValidatePreconditions() {
log.Debug("Add collector backend: " + backend.Name())
daemon.Daemon.AddBackend(backend, context)
}
}
}