Update godeps for etcd 3.0.4

vendor/github.com/grpc-ecosystem/grpc-gateway/runtime/mux.go

@@ -0,0 +1,132 @@
+package runtime
+
+import (
+	"net/http"
+	"strings"
+
+	"golang.org/x/net/context"
+
+	"github.com/golang/protobuf/proto"
+)
+
+// A HandlerFunc handles a specific pair of path pattern and HTTP method.
+type HandlerFunc func(w http.ResponseWriter, r *http.Request, pathParams map[string]string)
+
+// ServeMux is a request multiplexer for grpc-gateway.
+// It matches http requests to patterns and invokes the corresponding handler.
+type ServeMux struct {
+	// handlers maps HTTP method to a list of handlers.
+	handlers               map[string][]handler
+	forwardResponseOptions []func(context.Context, http.ResponseWriter, proto.Message) error
+	marshalers             marshalerRegistry
+}
+
+// ServeMuxOption is an option that can be given to a ServeMux on construction.
+type ServeMuxOption func(*ServeMux)
+
+// WithForwardResponseOption returns a ServeMuxOption representing the forwardResponseOption.
+//
+// forwardResponseOption is an option that will be called on the relevant context.Context,
+// http.ResponseWriter, and proto.Message before every forwarded response.
+//
+// The message may be nil in the case where just a header is being sent.
+func WithForwardResponseOption(forwardResponseOption func(context.Context, http.ResponseWriter, proto.Message) error) ServeMuxOption {
+	return func(serveMux *ServeMux) {
+		serveMux.forwardResponseOptions = append(serveMux.forwardResponseOptions, forwardResponseOption)
+	}
+}
+
+// NewServeMux returns a new ServeMux whose internal mapping is empty.
+func NewServeMux(opts ...ServeMuxOption) *ServeMux {
+	serveMux := &ServeMux{
+		handlers:               make(map[string][]handler),
+		forwardResponseOptions: make([]func(context.Context, http.ResponseWriter, proto.Message) error, 0),
+		marshalers:             makeMarshalerMIMERegistry(),
+	}
+
+	for _, opt := range opts {
+		opt(serveMux)
+	}
+	return serveMux
+}
+
+// Handle associates "h" to the pair of HTTP method and path pattern.
+func (s *ServeMux) Handle(meth string, pat Pattern, h HandlerFunc) {
+	s.handlers[meth] = append(s.handlers[meth], handler{pat: pat, h: h})
+}
+
+// ServeHTTP dispatches the request to the first handler whose pattern matches to r.Method and r.Path.
+func (s *ServeMux) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	path := r.URL.Path
+	if !strings.HasPrefix(path, "/") {
+		OtherErrorHandler(w, r, http.StatusText(http.StatusBadRequest), http.StatusBadRequest)
+		return
+	}
+
+	components := strings.Split(path[1:], "/")
+	l := len(components)
+	var verb string
+	if idx := strings.LastIndex(components[l-1], ":"); idx == 0 {
+		OtherErrorHandler(w, r, http.StatusText(http.StatusNotFound), http.StatusNotFound)
+		return
+	} else if idx > 0 {
+		c := components[l-1]
+		components[l-1], verb = c[:idx], c[idx+1:]
+	}
+
+	if override := r.Header.Get("X-HTTP-Method-Override"); override != "" && isPathLengthFallback(r) {
+		r.Method = strings.ToUpper(override)
+		if err := r.ParseForm(); err != nil {
+			OtherErrorHandler(w, r, err.Error(), http.StatusBadRequest)
+			return
+		}
+	}
+	for _, h := range s.handlers[r.Method] {
+		pathParams, err := h.pat.Match(components, verb)
+		if err != nil {
+			continue
+		}
+		h.h(w, r, pathParams)
+		return
+	}
+
+	// lookup other methods to handle fallback from GET to POST and
+	// to determine if it is MethodNotAllowed or NotFound.
+	for m, handlers := range s.handlers {
+		if m == r.Method {
+			continue
+		}
+		for _, h := range handlers {
+			pathParams, err := h.pat.Match(components, verb)
+			if err != nil {
+				continue
+			}
+			// X-HTTP-Method-Override is optional. Always allow fallback to POST.
+			if isPathLengthFallback(r) {
+				if err := r.ParseForm(); err != nil {
+					OtherErrorHandler(w, r, err.Error(), http.StatusBadRequest)
+					return
+				}
+				h.h(w, r, pathParams)
+				return
+			}
+			OtherErrorHandler(w, r, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
+			return
+		}
+	}
+	OtherErrorHandler(w, r, http.StatusText(http.StatusNotFound), http.StatusNotFound)
+}
+
+// GetForwardResponseOptions returns the ForwardResponseOptions associated with this ServeMux.
+func (s *ServeMux) GetForwardResponseOptions() []func(context.Context, http.ResponseWriter, proto.Message) error {
+	return s.forwardResponseOptions
+}
+
+func isPathLengthFallback(r *http.Request) bool {
+	return r.Method == "POST" && r.Header.Get("Content-Type") == "application/x-www-form-urlencoded"
+}
+
+type handler struct {
+	pat Pattern
+	h   HandlerFunc
+}