53 lines
1.7 KiB
Go
53 lines
1.7 KiB
Go
// Copyright 2015 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package proxy
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import (
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"net/http"
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)
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// GetProxyURLs is a function which should return the current set of URLs to
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// which client requests should be proxied. This function will be queried
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// periodically by the proxy Handler to refresh the set of available
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// backends.
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type GetProxyURLs func() []string
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// NewHandler creates a new HTTP handler, listening on the given transport,
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// which will proxy requests to an etcd cluster.
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// The handler will periodically update its view of the cluster.
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func NewHandler(t *http.Transport, urlsFunc GetProxyURLs) http.Handler {
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return &reverseProxy{
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director: newDirector(urlsFunc),
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transport: t,
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}
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}
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// NewReadonlyHandler wraps the given HTTP handler to allow only GET requests
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func NewReadonlyHandler(hdlr http.Handler) http.Handler {
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readonly := readonlyHandlerFunc(hdlr)
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return http.HandlerFunc(readonly)
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}
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func readonlyHandlerFunc(next http.Handler) func(http.ResponseWriter, *http.Request) {
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return func(w http.ResponseWriter, req *http.Request) {
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if req.Method != "GET" {
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w.WriteHeader(http.StatusNotImplemented)
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return
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}
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next.ServeHTTP(w, req)
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}
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}
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