func resourcesDiskHandler(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
collection := resources.NewCollection()
collection.CollectDiskMetrics()
marshalledResources, _ := json.MarshalIndent(collection, "", " ")
fmt.Fprintf(w, string(marshalledResources))
}
func main() {
flagVersion := flag.Bool("version", false, "Display Procd version.")
flagConfigFile := flag.String("config", "procd.toml", "Procd configuration file.")
flag.Parse()
runtime.GOMAXPROCS(runtime.NumCPU())
// Handle no command-line paramters
if flag.NFlag() == 0 {
flag.PrintDefaults()
os.Exit(0)
}
// Display Procd version
if *flagVersion {
fmt.Println("Procd v", Version)
os.Exit(0)
}
// Decode configuration [https://github.com/mojombo/toml]
var config procdConfig
_, err := toml.DecodeFile(*flagConfigFile, &config)
verifyErrorResponse(err, "could not decode TOML config")
// Setup output channels
for outputName, output := range config.Outputs {
switch outputName {
case "stdout":
fmt.Printf("\nProcd: Output[stdout]\n")
case "http":
go HTTPServerStart(output.BindAddress)
fmt.Printf("Procd: Output[http]: %s\n", output.BindAddress)
case "heka":
fmt.Printf("Procd: Output[heka]: %s [TCP / Protobufs]\n", output.Server)
}
}
// Timing channels for polling interval
collectionInterval := time.NewTicker(time.Second * time.Duration(config.TickerInterval))
collection := resources.NewCollection()
// Update statistics on interval until sigterm
go func() {
for _ = range collectionInterval.C {
collection.CollectAllMetrics()
for outputName, output := range config.Outputs {
switch outputName {
case "stdout":
marshalledResources, _ := json.MarshalIndent(collection, "", " ")
fmt.Println(string(marshalledResources))
case "heka":
hc, err := NewHekaClient(output.Server, output.Hostname)
if err == nil {
err := hc.SendCPUResources(collection, output.Payload)
verifyErrorResponse(err, "generate CPU resources Heka message")
err = hc.SendMemoryResources(collection, output.Payload)
verifyErrorResponse(err, "generate memory resources Heka message")
err = hc.SendDiskResources(collection, output.Payload)
verifyErrorResponse(err, "generate disk resources Heka message")
hc.sender.Close()
}
}
}
}
}()
fmt.Printf("Procd: Collection interval: %v seconds\n", config.TickerInterval)
exitStatus := make(chan bool, 1)
fmt.Println("Procd: Started.")
waitForSignals(exitStatus)
}