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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| package handler | ||
|
|
||
| import ( | ||
| "net/http" | ||
| "strings" | ||
| "sync" | ||
|
|
||
| "github.com/go-logr/logr" | ||
| ) | ||
|
|
||
| func NewSwitchableHandler(handA http.Handler, handB http.Handler, opts ...SwitchableHandlerOption) *SwitchableHandler { | ||
| var cfg SwitchableHandlerConfig | ||
|
|
||
| cfg.Option(opts...) | ||
| cfg.Default() | ||
|
|
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| return &SwitchableHandler{ | ||
| cfg: cfg, | ||
| handlerA: handA, | ||
| handlerB: handB, | ||
| } | ||
| } | ||
|
|
||
| type SwitchableHandler struct { | ||
| cfg SwitchableHandlerConfig | ||
| handlerA http.Handler | ||
| handlerB http.Handler | ||
|
|
||
| lock sync.Mutex | ||
| switched bool | ||
| } | ||
|
|
||
| func (h *SwitchableHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { | ||
| log := h.cfg.Log.WithValues("remote", r.RemoteAddr) | ||
|
|
||
| if h.switched { | ||
| log.WithValues("handler", "B").Info("serving request") | ||
|
|
||
| h.handlerB.ServeHTTP(w, r) | ||
| } else { | ||
| log.WithValues("handler", "A").Info("serving request") | ||
|
|
||
| h.handlerA.ServeHTTP(w, r) | ||
| } | ||
| } | ||
|
|
||
| func (h *SwitchableHandler) Switch() { | ||
| h.lock.Lock() | ||
| defer h.lock.Unlock() | ||
|
|
||
| if h.switched { | ||
| h.switched = false | ||
| } else { | ||
| h.switched = true | ||
| } | ||
| } | ||
|
|
||
| type SwitchableHandlerConfig struct { | ||
| Log logr.Logger | ||
| } | ||
|
|
||
| func (c *SwitchableHandlerConfig) Option(opts ...SwitchableHandlerOption) { | ||
| for _, opt := range opts { | ||
| opt.ConfigureSwitchableHandler(c) | ||
| } | ||
| } | ||
|
|
||
| func (c *SwitchableHandlerConfig) Default() { | ||
| if c.Log == nil { | ||
| c.Log = logr.Discard() | ||
| } | ||
| } | ||
|
|
||
| type SwitchableHandlerOption interface { | ||
| ConfigureSwitchableHandler(*SwitchableHandlerConfig) | ||
| } | ||
|
|
||
| func StopAfterNForwards(n uint, h http.Handler) http.Handler { | ||
| return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | ||
| rawFwds, ok := r.Header["X-Forwarded-For"] | ||
| if !ok { | ||
| h.ServeHTTP(w, r) | ||
| } | ||
|
|
||
| splitFwds := strings.Split(strings.Join(rawFwds, ", "), ", ") | ||
| if uint(len(splitFwds)) >= n { | ||
| http.Error(w, "", http.StatusLoopDetected) | ||
| } | ||
|
|
||
| h.ServeHTTP(w, r) | ||
| }) | ||
| } |
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