func initMetrics(cfg *config.Config) {
if err := metrics.Init(cfg.Metrics); err != nil {
log.Fatal("[FATAL] ", err)
}
}
func main() {
var cfg string
var v bool
flag.StringVar(&cfg, "cfg", "", "path to config file")
flag.BoolVar(&v, "v", false, "show version")
flag.Parse()
if v {
fmt.Println(version)
return
}
log.Printf("[INFO] Version %s starting", version)
if cfg != "" {
if err := loadConfig(cfg); err != nil {
log.Fatal("[FATAL] ", err)
}
}
if err := metrics.Init(metricsTarget, metricsPrefix, metricsInterval, metricsGraphiteAddr); err != nil {
log.Fatal("[FATAL] ", err)
}
if os.Getenv("GOMAXPROCS") == "" {
log.Print("[INFO] Setting GOMAXPROCS=", gomaxprocs)
runtime.GOMAXPROCS(gomaxprocs)
} else {
log.Print("[INFO] Using GOMAXPROCS=", os.Getenv("GOMAXPROCS"), " from env")
}
if os.Getenv("GOGC") == "" {
log.Print("[INFO] Setting GOGC=", gogc)
debug.SetGCPercent(gogc)
} else {
log.Print("[INFO] Using GOGC=", os.Getenv("GOGC"), " from env")
}
if proxyRoutes == "" {
useDynamicRoutes()
} else {
useStaticRoutes()
}
if err := route.SetPickerStrategy(proxyStrategy); err != nil {
log.Fatal("[FATAL] ", err)
}
consul.Addr = consulAddr
consul.URL = consulURL
dc, err := consul.Datacenter()
if err != nil {
log.Fatal("[FATAL] ", err)
}
log.Printf("[INFO] Using routing strategy %q", proxyStrategy)
log.Printf("[INFO] Connecting to consul on %q in datacenter %q", consulAddr, dc)
log.Printf("[INFO] Consul can be reached via %q", consulURL)
log.Printf("[INFO] UI listening on %q", uiAddr)
go func() {
if err := ui.Start(uiAddr, consulKVPath); err != nil {
log.Fatal("[FATAL] ui: ", err)
}
}()
tr := &http.Transport{
ResponseHeaderTimeout: proxyTimeout,
MaxIdleConnsPerHost: proxyMaxConn,
Dial: (&net.Dialer{
Timeout: proxyDialTimeout,
KeepAlive: proxyTimeout,
}).Dial,
}
proxy := route.NewProxy(tr, proxyHeaderClientIP, proxyHeaderTLS, proxyHeaderTLSValue)
listen(proxyAddr, proxyShutdownWait, proxy)
}