traefik/middlewares/handlerSwitcher.go

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package middlewares
import (
"github.com/gorilla/mux"
"net/http"
"sync"
)
// HandlerSwitcher allows hot switching of http.ServeMux
type HandlerSwitcher struct {
handler *mux.Router
handlerLock *sync.Mutex
}
// NewHandlerSwitcher builds a new instance of HandlerSwitcher
func NewHandlerSwitcher(newHandler *mux.Router) (hs *HandlerSwitcher) {
return &HandlerSwitcher{
handler: newHandler,
handlerLock: &sync.Mutex{},
}
}
func (hs *HandlerSwitcher) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
hs.handlerLock.Lock()
handlerBackup := hs.handler
hs.handlerLock.Unlock()
handlerBackup.ServeHTTP(rw, r)
}
// GetHandler returns the current http.ServeMux
func (hs *HandlerSwitcher) GetHandler() (newHandler *mux.Router) {
return hs.handler
}
// UpdateHandler safely updates the current http.ServeMux with a new one
func (hs *HandlerSwitcher) UpdateHandler(newHandler *mux.Router) {
hs.handlerLock.Lock()
hs.handler = newHandler
defer hs.handlerLock.Unlock()
}