// Service setup.
// Define service config.
// Create the service.
// Setup the logger.
// Handle service controls (optional).
// Run the service.
func main() {
svcFlag := flag.String("service", "", "Control the system service.")
flag.Parse()
if !service.Interactive() {
root, _ := osext.ExecutableFolder()
f, err := os.OpenFile(root+"/output.log", os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
if err != nil {
log.Fatal(err)
}
defer f.Close()
log.SetOutput(f)
}
svcConfig := &service.Config{
Name: "FPL Checker",
DisplayName: "FPL Checker",
Description: "Free Post Code Lottery daily winner checker",
}
prg := &program{}
s, err := service.New(prg, svcConfig)
if err != nil {
log.Fatal(err)
}
errs := make(chan error, 5)
logger, err = s.Logger(errs)
if err != nil {
log.Fatal(err)
}
go func() {
for {
err := <-errs
if err != nil {
log.Print(err)
}
}
}()
if len(*svcFlag) != 0 {
err := service.Control(s, *svcFlag)
if err != nil {
log.Printf("Valid actions: %q\n", service.ControlAction)
log.Fatal(err)
}
return
}
err = s.Run()
if err != nil {
logger.Error(err)
}
}
func (p *program) Stop(s service.Service) error {
close(p.exit)
logger.Info("Stopping ", p.DisplayName)
if p.cmd.ProcessState.Exited() == false {
p.cmd.Process.Kill()
}
if service.Interactive() {
os.Exit(0)
}
return nil
}
func (p *program) Start(s service.Service) error {
if service.Interactive() {
logger.Info("Running in terminal.")
} else {
logger.Info("Running under service manager.")
}
p.exit = make(chan struct{})
// Start should not block. Do the actual work async.
go p.run()
return nil
}
func (p *program) run() {
logger.Info("Starting ", p.DisplayName)
defer func() {
if service.Interactive() {
p.Stop(p.service)
} else {
p.service.Stop()
}
}()
if p.Stderr != "" {
f, err := os.OpenFile(p.Stderr, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0777)
if err != nil {
logger.Warningf("Failed to open std err %q: %v", p.Stderr, err)
return
}
defer f.Close()
p.cmd.Stderr = f
}
if p.Stdout != "" {
f, err := os.OpenFile(p.Stdout, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0777)
if err != nil {
logger.Warningf("Failed to open std out %q: %v", p.Stdout, err)
return
}
defer f.Close()
p.cmd.Stdout = f
}
err := p.cmd.Run()
if err != nil {
logger.Warningf("Error running: %v", err)
}
return
}
func reloadLoop(stop chan struct{}, s service.Service) {
defer func() {
if service.Interactive() {
os.Exit(0)
}
return
}()
reload := make(chan bool, 1)
reload <- true
for <-reload {
reload <- false
flag.Usage = func() { usageExit(0) }
flag.Parse()
args := flag.Args()
var inputFilters []string
if *fInputFilters != "" {
inputFilter := strings.TrimSpace(*fInputFilters)
inputFilters = strings.Split(":"+inputFilter+":", ":")
}
var outputFilters []string
if *fOutputFilters != "" {
outputFilter := strings.TrimSpace(*fOutputFilters)
outputFilters = strings.Split(":"+outputFilter+":", ":")
}
if len(args) > 0 {
switch args[0] {
case "version":
v := fmt.Sprintf("Telegraf - version %s", version)
fmt.Println(v)
return
case "config":
config.PrintSampleConfig(inputFilters, outputFilters)
return
}
}
// switch for flags which just do something and exit immediately
switch {
case *fOutputList:
fmt.Println("Available Output Plugins:")
for k, _ := range outputs.Outputs {
fmt.Printf(" %s\n", k)
}
return
case *fInputList:
fmt.Println("Available Input Plugins:")
for k, _ := range inputs.Inputs {
fmt.Printf(" %s\n", k)
}
return
case *fVersion:
v := fmt.Sprintf("Telegraf - version %s", version)
fmt.Println(v)
return
case *fSampleConfig:
config.PrintSampleConfig(inputFilters, outputFilters)
return
case *fUsage != "":
if err := config.PrintInputConfig(*fUsage); err != nil {
if err2 := config.PrintOutputConfig(*fUsage); err2 != nil {
log.Fatalf("%s and %s", err, err2)
}
}
return
case *fService != "" && runtime.GOOS == "windows":
if *fConfig != "" {
(*svcConfig).Arguments = []string{"-config", *fConfig}
}
err := service.Control(s, *fService)
if err != nil {
log.Fatal(err)
}
return
}
// If no other options are specified, load the config file and run.
c := config.NewConfig()
c.OutputFilters = outputFilters
c.InputFilters = inputFilters
err := c.LoadConfig(*fConfig)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
if *fConfigDirectory != "" {
err = c.LoadDirectory(*fConfigDirectory)
if err != nil {
log.Fatal(err)
}
}
if len(c.Outputs) == 0 {
log.Fatalf("Error: no outputs found, did you provide a valid config file?")
}
if len(c.Inputs) == 0 {
log.Fatalf("Error: no inputs found, did you provide a valid config file?")
}
ag, err := agent.NewAgent(c)
if err != nil {
log.Fatal(err)
}
if *fDebug {
ag.Config.Agent.Debug = true
}
if *fQuiet {
ag.Config.Agent.Quiet = true
}
if *fTest {
err = ag.Test()
if err != nil {
log.Fatal(err)
}
return
}
err = ag.Connect()
if err != nil {
log.Fatal(err)
}
shutdown := make(chan struct{})
signals := make(chan os.Signal)
signal.Notify(signals, os.Interrupt, syscall.SIGHUP)
go func() {
select {
case sig := <-signals:
if sig == os.Interrupt {
close(shutdown)
}
if sig == syscall.SIGHUP {
log.Printf("Reloading Telegraf config\n")
<-reload
reload <- true
close(shutdown)
}
case <-stop:
close(shutdown)
}
}()
log.Printf("Starting Telegraf (version %s)\n", version)
log.Printf("Loaded outputs: %s", strings.Join(c.OutputNames(), " "))
log.Printf("Loaded inputs: %s", strings.Join(c.InputNames(), " "))
log.Printf("Tags enabled: %s", c.ListTags())
if *fPidfile != "" {
f, err := os.Create(*fPidfile)
if err != nil {
log.Fatalf("Unable to create pidfile: %s", err)
}
fmt.Fprintf(f, "%d\n", os.Getpid())
f.Close()
}
ag.Run(shutdown)
}
}
func reloadLoop(stop chan struct{}, s service.Service) {
defer func() {
if service.Interactive() {
os.Exit(0)
}
return
}()
reload := make(chan bool, 1)
reload <- true
for <-reload {
reload <- false
flag.Parse()
args := flag.Args()
var inputFilters []string
if *fInputFilters != "" {
inputFilter := strings.TrimSpace(*fInputFilters)
inputFilters = strings.Split(":"+inputFilter+":", ":")
}
var outputFilters []string
if *fOutputFilters != "" {
outputFilter := strings.TrimSpace(*fOutputFilters)
outputFilters = strings.Split(":"+outputFilter+":", ":")
}
var aggregatorFilters []string
if *fAggregatorFilters != "" {
aggregatorFilter := strings.TrimSpace(*fAggregatorFilters)
aggregatorFilters = strings.Split(":"+aggregatorFilter+":", ":")
}
var processorFilters []string
if *fProcessorFilters != "" {
processorFilter := strings.TrimSpace(*fProcessorFilters)
processorFilters = strings.Split(":"+processorFilter+":", ":")
}
if len(args) > 0 {
switch args[0] {
case "version":
fmt.Printf("Telegraf v%s (git: %s %s)\n", version, branch, commit)
return
case "config":
config.PrintSampleConfig(
inputFilters,
outputFilters,
aggregatorFilters,
processorFilters,
)
return
}
}
// switch for flags which just do something and exit immediately
switch {
case *fOutputList:
fmt.Println("Available Output Plugins:")
for k, _ := range outputs.Outputs {
fmt.Printf(" %s\n", k)
}
return
case *fInputList:
fmt.Println("Available Input Plugins:")
for k, _ := range inputs.Inputs {
fmt.Printf(" %s\n", k)
}
return
case *fVersion:
fmt.Printf("Telegraf v%s (git: %s %s)\n", version, branch, commit)
return
case *fSampleConfig:
config.PrintSampleConfig(
inputFilters,
outputFilters,
aggregatorFilters,
processorFilters,
)
return
case *fUsage != "":
if err := config.PrintInputConfig(*fUsage); err != nil {
if err2 := config.PrintOutputConfig(*fUsage); err2 != nil {
log.Fatalf("E! %s and %s", err, err2)
}
}
return
}
// If no other options are specified, load the config file and run.
c := config.NewConfig()
c.OutputFilters = outputFilters
c.InputFilters = inputFilters
err := c.LoadConfig(*fConfig)
if err != nil {
log.Fatal("E! " + err.Error())
}
if *fConfigDirectory != "" {
err = c.LoadDirectory(*fConfigDirectory)
if err != nil {
log.Fatal("E! " + err.Error())
}
}
if len(c.Outputs) == 0 {
log.Fatalf("E! Error: no outputs found, did you provide a valid config file?")
}
if len(c.Inputs) == 0 {
log.Fatalf("E! Error: no inputs found, did you provide a valid config file?")
}
ag, err := agent.NewAgent(c)
if err != nil {
log.Fatal("E! " + err.Error())
}
// Setup logging
logger.SetupLogging(
ag.Config.Agent.Debug || *fDebug,
ag.Config.Agent.Quiet || *fQuiet,
ag.Config.Agent.Logfile,
)
if *fTest {
err = ag.Test()
if err != nil {
log.Fatal("E! " + err.Error())
}
return
}
err = ag.Connect()
if err != nil {
log.Fatal("E! " + err.Error())
}
shutdown := make(chan struct{})
signals := make(chan os.Signal)
signal.Notify(signals, os.Interrupt, syscall.SIGHUP)
go func() {
select {
case sig := <-signals:
if sig == os.Interrupt {
close(shutdown)
}
if sig == syscall.SIGHUP {
log.Printf("I! Reloading Telegraf config\n")
<-reload
reload <- true
close(shutdown)
}
case <-stop:
close(shutdown)
}
}()
log.Printf("I! Starting Telegraf (version %s)\n", version)
log.Printf("I! Loaded outputs: %s", strings.Join(c.OutputNames(), " "))
log.Printf("I! Loaded inputs: %s", strings.Join(c.InputNames(), " "))
log.Printf("I! Tags enabled: %s", c.ListTags())
if *fPidfile != "" {
f, err := os.Create(*fPidfile)
if err != nil {
log.Fatalf("E! Unable to create pidfile: %s", err)
}
fmt.Fprintf(f, "%d\n", os.Getpid())
f.Close()
}
ag.Run(shutdown)
}
}
// program start
func main() {
var err error
sconf := service.Config{
Name: "BabelPoxy",
DisplayName: "Babel Proxy",
Description: "babelproxy converts RESTful calls into Babel calls.",
}
// Parse flags from command-line
flag.Parse()
// Parser flags from config
flagcfg.AddDefaults()
flagcfg.Parse()
// Parse flags from environment (using github.com/facebookgo/flagenv)
flagenv.Prefix = "BABELPROXY_"
flagenv.Parse()
// show help if asked
if help {
fmt.Fprintln(os.Stderr, `Usage of babelproxy:
babelproxy [options] <filepatterns>
"For the faasti RESTafarians! (Feel no way, we maas.)"
Example:
babelproxy *.babel
Options include:`)
flag.PrintDefaults()
fmt.Fprintln(os.Stderr, `
All of the options can be overridden in the configuration file. To override
the location of the configuration file, set the BABELPROXY_CONFIG environment
variable. When running as a service, all options must be specified in the
configuration file or environment variables.`)
return
}
// show version if asked
if ver {
fmt.Printf("babelproxy Version %s\n", BABELPROXY_VERSION)
return
}
// default the pubaddr
if strings.TrimSpace(conf.PubAddr) == "" {
conf.PubAddr = conf.RestAddr
}
// handle kill signals
go func() {
// setup cpu profiling if desired
var f io.WriteCloser
var err error
if conf.CpuProfile != "" {
f, err = os.Create(conf.CpuProfile)
if err != nil {
log.Fatal(err)
}
pprof.StartCPUProfile(f)
}
// Set up channel on which to send signal notifications.
// We must use a buffered channel or risk missing the signal
// if we're not ready to receive when the signal is sent.
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt, os.Kill)
// Block until a signal is received.
s := <-c
log.Print("Got signal ", s, ", canceling work")
if conf.CpuProfile != "" {
log.Print("Writing CPU profile to ", conf.CpuProfile)
pprof.StopCPUProfile()
f.Close()
}
// write memory profile if configured
if conf.MemProfile != "" {
f, err := os.Create(conf.MemProfile)
if err != nil {
log.Print(err)
} else {
log.Print("Writing memory profile to ", conf.MemProfile)
pprof.WriteHeapProfile(f)
f.Close()
}
}
os.Exit(0)
}()
// setup number of CPUs
runtime.GOMAXPROCS(conf.Cpus)
// set working directory
if conf.WorkingDir != "" {
err = os.Chdir(conf.WorkingDir)
if err != nil {
log.Fatal(err)
}
}
// override configured arguments (file list) with command line
if flag.NArg() > 0 {
conf.Args = flag.Args()
}
var i svcImpl
svcBroxy, err = service.New(&i, &sconf)
if err != nil {
log.Fatal(err)
}
/*
svcLogger, err = svcBroxy.Logger(nil)
if err != nil {
log.Fatal(err)
}
*/
if control != "" {
err = service.Control(svcBroxy, control)
if err != nil {
log.Fatal(err)
}
return
}
if service.Interactive() {
i.doWork()
} else {
err = svcBroxy.Run()
if err != nil {
//svcLogger.Error(err.Error())
log.Println(err)
}
}
}