mirror of https://github.com/k3s-io/k3s
67 lines
1.9 KiB
Go
67 lines
1.9 KiB
Go
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package endpoint
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import (
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"log"
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"net/http"
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"strings"
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"github.com/sirupsen/logrus"
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"google.golang.org/grpc"
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)
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var (
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etcdVersion = []byte(`{"etcdserver":"3.5.0","etcdcluster":"3.5.0"}`)
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versionPath = "/version"
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)
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// httpServer returns a HTTP server with the basic mux handler.
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func httpServer() *http.Server {
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// Set up root HTTP mux with basic response handlers
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mux := http.NewServeMux()
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handleBasic(mux)
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return &http.Server{
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Handler: mux,
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ErrorLog: log.New(logrus.StandardLogger().Writer(), "kinehttp ", log.LstdFlags),
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}
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}
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// handleBasic binds basic HTTP response handlers to a mux.
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func handleBasic(mux *http.ServeMux) {
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mux.HandleFunc(versionPath, serveVersion)
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}
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// serveVersion responds with a canned JSON version response.
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func serveVersion(w http.ResponseWriter, r *http.Request) {
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if !allowMethod(w, r, http.MethodGet) {
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return
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}
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w.Header().Set("Content-Type", "application/json")
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w.Write(etcdVersion)
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}
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// allowMethod returns true if a method is allowed, or false (after sending a
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// MethodNotAllowed error to the client) if it is not.
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func allowMethod(w http.ResponseWriter, r *http.Request, m string) bool {
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if m == r.Method {
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return true
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}
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w.Header().Set("Allow", m)
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http.Error(w, "Method Not Allowed", http.StatusMethodNotAllowed)
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return false
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}
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// grpcHandlerFunc takes a GRPC server and HTTP handler, and returns a handler
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// function that will route GRPC requests to the GRPC server, and everything
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// else to the HTTP handler. This is based on sample code provided in the GRPC
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// ServeHTTP documentation for sharing a port between GRPC and HTTP handlers.
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func grpcHandlerFunc(grpcServer *grpc.Server, httpHandler http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if r.ProtoMajor == 2 && strings.HasPrefix(r.Header.Get("Content-Type"), "application/grpc") {
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grpcServer.ServeHTTP(w, r)
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} else {
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httpHandler.ServeHTTP(w, r)
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}
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})
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}
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