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