First commit

proxyprotocol.go

@@ -0,0 +1,36 @@
+// Package proxyprotocol implement receiver for HA Proxy Protocol V1 and V2.
+//
+// Proxy Protocol spec http://www.haproxy.org/download/2.0/doc/proxy-protocol.txt
+//
+// This package provides a wrapper for the interface net.Listener, which extracts
+// remote and local address of the connection from the headers in the format
+// HA proxy protocol.
+package proxyprotocol
+
+import (
+	"bufio"
+	"errors"
+	"net"
+)
+
+// Header struct represent header parsing result
+type Header struct {
+	SrcAddr net.Addr
+	DstAddr net.Addr
+}
+
+// HeaderParserBuilder build HeaderParser's
+type HeaderParserBuilder interface {
+	Build(Logger) HeaderParser
+}
+
+// HeaderParser describe interface for header parsers
+type HeaderParser interface {
+	Parse(readBuf *bufio.Reader) (*Header, error)
+}
+
+// Shared HeaderParser errors
+var (
+	ErrInvalidSignature = errors.New("invalid signature")
+	ErrUnknownProtocol  = errors.New("unknown protocol")
+)