从proxy获取client ip地址

vendor/github.com/pires/go-proxyproto/README.md

@@ -0,0 +1,69 @@
+# go-proxyproto
+
+[![Actions Status](https://github.com/pires/go-proxyproto/workflows/test/badge.svg)](https://github.com/pires/go-proxyproto/actions)
+[![Coverage Status](https://coveralls.io/repos/github/pires/go-proxyproto/badge.svg?branch=master)](https://coveralls.io/github/pires/go-proxyproto?branch=master)
+[![Go Report Card](https://goreportcard.com/badge/github.com/pires/go-proxyproto)](https://goreportcard.com/report/github.com/pires/go-proxyproto)
+[![](https://godoc.org/github.com/pires/go-proxyproto?status.svg)](http://godoc.org/github.com/pires/go-proxyproto)
+
+
+A Go library implementation of the [PROXY protocol, versions 1 and 2](http://www.haproxy.org/download/1.5/doc/proxy-protocol.txt),
+which provides, as per specification:
+> (...) a convenient way to safely transport connection
+> information such as a client's address across multiple layers of NAT or TCP
+> proxies. It is designed to require little changes to existing components and
+> to limit the performance impact caused by the processing of the transported
+> information.
+
+This library is to be used in one of or both proxy clients and proxy servers that need to support said protocol.
+Both protocol versions, 1 (text-based) and 2 (binary-based) are supported.
+
+## Installation
+
+```shell
+$ go get -u github.com/pires/go-proxyproto
+```
+
+## Usage
+
+### Client (TODO)
+
+### Server
+
+```go
+package main
+
+import (
+	"log"
+	"net"
+	
+	proxyproto "github.com/pires/go-proxyproto"
+)
+
+func main() {
+	// Create a listener
+	addr := "localhost:9876"
+	list, err := net.Listen("tcp", addr)
+	if err != nil {
+		log.Fatalf("couldn't listen to %q: %q\n", addr, err.Error())
+	}
+
+	// Wrap listener in a proxyproto listener
+	proxyListener := &proxyproto.Listener{Listener: list}
+	defer proxyListener.Close()
+
+	// Wait for a connection and accept it
+	conn, err := proxyListener.Accept()
+	defer conn.Close()
+
+	// Print connection details
+	if conn.LocalAddr() == nil {
+		log.Fatal("couldn't retrieve local address")
+	}
+	log.Printf("local address: %q", conn.LocalAddr().String())
+
+	if conn.RemoteAddr() == nil {
+		log.Fatal("couldn't retrieve remote address")
+	}
+	log.Printf("remote address: %q", conn.RemoteAddr().String())
+}
+```