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0589afe605
This PR set maxIdleConnsPerHost to 128 to let proxy handle 128 concurrent requests in long term smoothly. If the number of concurrent requests is bigger than this value, proxy needs to create one new connection when handling each request in the delta, which is bad because the creation consumes resource and may eat up your ephemeral port.
64 lines
2.2 KiB
Go
64 lines
2.2 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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const (
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// DefaultMaxIdleConnsPerHost indicates the default maximal idle connections
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// maintained between proxy and each member. We set it to 128 to
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// let proxy handle 128 concurrent requests in long term smoothly.
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// If the number of concurrent requests is bigger than this value,
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// proxy needs to create one new connection when handling each request in
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// the delta, which is bad because the creation consumes resource and
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// may eat up ephemeral ports.
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DefaultMaxIdleConnsPerHost = 128
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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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