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Copy pathinit.go
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98 lines (84 loc) · 1.92 KB
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package main
import (
"log"
"os"
"runtime"
"runtime/debug"
"strings"
"github.com/eBay/fabio/config"
"github.com/eBay/fabio/metrics"
"github.com/eBay/fabio/registry"
"github.com/eBay/fabio/registry/consul"
"github.com/eBay/fabio/route"
)
var be registry.Backend
func loadConfig(filename string) *config.Config {
cfg, err := config.FromFile(filename)
if err != nil {
log.Fatal("[FATAL] ", err)
}
return cfg
}
func initBackend(cfg *config.Config) {
var err error
be, err = consul.NewBackend(&cfg.Consul)
if err != nil {
log.Fatal("[FATAL] Error initializing backend. ", err)
}
}
func initMetrics(cfg *config.Config) {
if err := metrics.Init(cfg.Metrics); err != nil {
log.Fatal("[FATAL] ", err)
}
}
func initRuntime(cfg *config.Config) {
if os.Getenv("GOGC") == "" {
log.Print("[INFO] Setting GOGC=", cfg.Runtime.GOGC)
debug.SetGCPercent(cfg.Runtime.GOGC)
} else {
log.Print("[INFO] Using GOGC=", os.Getenv("GOGC"), " from env")
}
if os.Getenv("GOMAXPROCS") == "" {
log.Print("[INFO] Setting GOMAXPROCS=", cfg.Runtime.GOMAXPROCS)
runtime.GOMAXPROCS(cfg.Runtime.GOMAXPROCS)
} else {
log.Print("[INFO] Using GOMAXPROCS=", os.Getenv("GOMAXPROCS"), " from env")
}
}
func initRoutes(cfg *config.Config) {
if cfg.Routes == "" {
initDynamicRoutes()
} else {
initStaticRoutes(cfg.Routes)
}
}
func initDynamicRoutes() {
go func() {
ch := be.Watch()
for {
r := <-ch
t, err := route.ParseString(r)
if err != nil {
log.Printf("[WARN] %s", err)
continue
}
route.SetTable(t)
}
}()
}
func initStaticRoutes(routes string) {
var err error
var t route.Table
if strings.HasPrefix(routes, "@") {
routes = routes[1:]
log.Print("[INFO] Using static routes from ", routes)
t, err = route.ParseFile(routes)
} else {
log.Print("[INFO] Using static routes from config file")
t, err = route.ParseString(routes)
}
if err != nil {
log.Fatal("[FATAL] ", err)
}
route.SetTable(t)
}