Export command constants.

Although it is possible to get the command name for each msg type by
creating an instances of the type and calling the Command method against
it, it's slightly more efficient to simply allows callers to have direct
access to the exported constants.

This is currently really useful for the reject message since callers need
to be able to examine the command type to determine whether or not the
hash field needs to be included.

message.go

@@ -26,27 +26,27 @@ const MaxMessagePayload = (1024 * 1024 * 32) // 32MB
 
 // Commands used in bitcoin message headers which describe the type of message.
 const (
-	cmdVersion     = "version"
-	cmdVerAck      = "verack"
-	cmdGetAddr     = "getaddr"
-	cmdAddr        = "addr"
-	cmdGetBlocks   = "getblocks"
-	cmdInv         = "inv"
-	cmdGetData     = "getdata"
-	cmdNotFound    = "notfound"
-	cmdBlock       = "block"
-	cmdTx          = "tx"
-	cmdGetHeaders  = "getheaders"
-	cmdHeaders     = "headers"
-	cmdPing        = "ping"
-	cmdPong        = "pong"
-	cmdAlert       = "alert"
-	cmdMemPool     = "mempool"
-	cmdFilterAdd   = "filteradd"
-	cmdFilterClear = "filterclear"
-	cmdFilterLoad  = "filterload"
-	cmdMerkleBlock = "merkleblock"
-	cmdReject      = "reject"
+	CmdVersion     = "version"
+	CmdVerAck      = "verack"
+	CmdGetAddr     = "getaddr"
+	CmdAddr        = "addr"
+	CmdGetBlocks   = "getblocks"
+	CmdInv         = "inv"
+	CmdGetData     = "getdata"
+	CmdNotFound    = "notfound"
+	CmdBlock       = "block"
+	CmdTx          = "tx"
+	CmdGetHeaders  = "getheaders"
+	CmdHeaders     = "headers"
+	CmdPing        = "ping"
+	CmdPong        = "pong"
+	CmdAlert       = "alert"
+	CmdMemPool     = "mempool"
+	CmdFilterAdd   = "filteradd"
+	CmdFilterClear = "filterclear"
+	CmdFilterLoad  = "filterload"
+	CmdMerkleBlock = "merkleblock"
+	CmdReject      = "reject"
 )
 
 // Message is an interface that describes a bitcoin message.  A type that
@@ -65,67 +65,67 @@ type Message interface {
 func makeEmptyMessage(command string) (Message, error) {
 	var msg Message
 	switch command {
-	case cmdVersion:
+	case CmdVersion:
 		msg = &MsgVersion{}
 
-	case cmdVerAck:
+	case CmdVerAck:
 		msg = &MsgVerAck{}
 
-	case cmdGetAddr:
+	case CmdGetAddr:
 		msg = &MsgGetAddr{}
 
-	case cmdAddr:
+	case CmdAddr:
 		msg = &MsgAddr{}
 
-	case cmdGetBlocks:
+	case CmdGetBlocks:
 		msg = &MsgGetBlocks{}
 
-	case cmdBlock:
+	case CmdBlock:
 		msg = &MsgBlock{}
 
-	case cmdInv:
+	case CmdInv:
 		msg = &MsgInv{}
 
-	case cmdGetData:
+	case CmdGetData:
 		msg = &MsgGetData{}
 
-	case cmdNotFound:
+	case CmdNotFound:
 		msg = &MsgNotFound{}
 
-	case cmdTx:
+	case CmdTx:
 		msg = &MsgTx{}
 
-	case cmdPing:
+	case CmdPing:
 		msg = &MsgPing{}
 
-	case cmdPong:
+	case CmdPong:
 		msg = &MsgPong{}
 
-	case cmdGetHeaders:
+	case CmdGetHeaders:
 		msg = &MsgGetHeaders{}
 
-	case cmdHeaders:
+	case CmdHeaders:
 		msg = &MsgHeaders{}
 
-	case cmdAlert:
+	case CmdAlert:
 		msg = &MsgAlert{}
 
-	case cmdMemPool:
+	case CmdMemPool:
 		msg = &MsgMemPool{}
 
-	case cmdFilterAdd:
+	case CmdFilterAdd:
 		msg = &MsgFilterAdd{}
 
-	case cmdFilterClear:
+	case CmdFilterClear:
 		msg = &MsgFilterClear{}
 
-	case cmdFilterLoad:
+	case CmdFilterLoad:
 		msg = &MsgFilterLoad{}
 
-	case cmdMerkleBlock:
+	case CmdMerkleBlock:
 		msg = &MsgMerkleBlock{}
 
-	case cmdReject:
+	case CmdReject:
 		msg = &MsgReject{}
 
 	default:

msgaddr.go

@@ -118,7 +118,7 @@ func (msg *MsgAddr) BtcEncode(w io.Writer, pver uint32) error {
 // Command returns the protocol command string for the message.  This is part
 // of the Message interface implementation.
 func (msg *MsgAddr) Command() string {
-	return cmdAddr
+	return CmdAddr
 }
 
 // MaxPayloadLength returns the maximum length the payload can be for the

msgalert.go

@@ -400,7 +400,7 @@ func (msg *MsgAlert) BtcEncode(w io.Writer, pver uint32) error {
 // Command returns the protocol command string for the message.  This is part
 // of the Message interface implementation.
 func (msg *MsgAlert) Command() string {
-	return cmdAlert
+	return CmdAlert
 }
 
 // MaxPayloadLength returns the maximum length the payload can be for the

msgblock.go

@@ -211,7 +211,7 @@ func (msg *MsgBlock) SerializeSize() int {
 // Command returns the protocol command string for the message.  This is part
 // of the Message interface implementation.
 func (msg *MsgBlock) Command() string {
-	return cmdBlock
+	return CmdBlock
 }
 
 // MaxPayloadLength returns the maximum length the payload can be for the

msgfilteradd.go

@@ -71,7 +71,7 @@ func (msg *MsgFilterAdd) BtcEncode(w io.Writer, pver uint32) error {
 // Command returns the protocol command string for the message.  This is part
 // of the Message interface implementation.
 func (msg *MsgFilterAdd) Command() string {
-	return cmdFilterAdd
+	return CmdFilterAdd
 }
 
 // MaxPayloadLength returns the maximum length the payload can be for the

msgfilterclear.go

@@ -43,7 +43,7 @@ func (msg *MsgFilterClear) BtcEncode(w io.Writer, pver uint32) error {
 // Command returns the protocol command string for the message.  This is part
 // of the Message interface implementation.
 func (msg *MsgFilterClear) Command() string {
-	return cmdFilterClear
+	return CmdFilterClear
 }
 
 // MaxPayloadLength returns the maximum length the payload can be for the

msgfilterload.go

@@ -117,7 +117,7 @@ func (msg *MsgFilterLoad) BtcEncode(w io.Writer, pver uint32) error {
 // Command returns the protocol command string for the message.  This is part
 // of the Message interface implementation.
 func (msg *MsgFilterLoad) Command() string {
-	return cmdFilterLoad
+	return CmdFilterLoad
 }
 
 // MaxPayloadLength returns the maximum length the payload can be for the

msggetaddr.go

@@ -31,7 +31,7 @@ func (msg *MsgGetAddr) BtcEncode(w io.Writer, pver uint32) error {
 // Command returns the protocol command string for the message.  This is part
 // of the Message interface implementation.
 func (msg *MsgGetAddr) Command() string {
-	return cmdGetAddr
+	return CmdGetAddr
 }
 
 // MaxPayloadLength returns the maximum length the payload can be for the

msggetblocks.go

@@ -121,7 +121,7 @@ func (msg *MsgGetBlocks) BtcEncode(w io.Writer, pver uint32) error {
 // Command returns the protocol command string for the message.  This is part
 // of the Message interface implementation.
 func (msg *MsgGetBlocks) Command() string {
-	return cmdGetBlocks
+	return CmdGetBlocks
 }
 
 // MaxPayloadLength returns the maximum length the payload can be for the

msggetdata.go

@@ -90,7 +90,7 @@ func (msg *MsgGetData) BtcEncode(w io.Writer, pver uint32) error {
 // Command returns the protocol command string for the message.  This is part
 // of the Message interface implementation.
 func (msg *MsgGetData) Command() string {
-	return cmdGetData
+	return CmdGetData
 }
 
 // MaxPayloadLength returns the maximum length the payload can be for the

msggetheaders.go

@@ -119,7 +119,7 @@ func (msg *MsgGetHeaders) BtcEncode(w io.Writer, pver uint32) error {
 // Command returns the protocol command string for the message.  This is part
 // of the Message interface implementation.
 func (msg *MsgGetHeaders) Command() string {
-	return cmdGetHeaders
+	return CmdGetHeaders
 }
 
 // MaxPayloadLength returns the maximum length the payload can be for the

msgheaders.go

@@ -113,7 +113,7 @@ func (msg *MsgHeaders) BtcEncode(w io.Writer, pver uint32) error {
 // Command returns the protocol command string for the message.  This is part
 // of the Message interface implementation.
 func (msg *MsgHeaders) Command() string {
-	return cmdHeaders
+	return CmdHeaders
 }
 
 // MaxPayloadLength returns the maximum length the payload can be for the

msginv.go

@@ -98,7 +98,7 @@ func (msg *MsgInv) BtcEncode(w io.Writer, pver uint32) error {
 // Command returns the protocol command string for the message.  This is part
 // of the Message interface implementation.
 func (msg *MsgInv) Command() string {
-	return cmdInv
+	return CmdInv
 }
 
 // MaxPayloadLength returns the maximum length the payload can be for the

msgmempool.go

@@ -44,7 +44,7 @@ func (msg *MsgMemPool) BtcEncode(w io.Writer, pver uint32) error {
 // Command returns the protocol command string for the message.  This is part
 // of the Message interface implementation.
 func (msg *MsgMemPool) Command() string {
-	return cmdMemPool
+	return CmdMemPool
 }
 
 // MaxPayloadLength returns the maximum length the payload can be for the

msgmerkleblock.go

@@ -146,7 +146,7 @@ func (msg *MsgMerkleBlock) BtcEncode(w io.Writer, pver uint32) error {
 // Command returns the protocol command string for the message.  This is part
 // of the Message interface implementation.
 func (msg *MsgMerkleBlock) Command() string {
-	return cmdMerkleBlock
+	return CmdMerkleBlock
 }
 
 // MaxPayloadLength returns the maximum length the payload can be for the

msgnotfound.go

@@ -87,7 +87,7 @@ func (msg *MsgNotFound) BtcEncode(w io.Writer, pver uint32) error {
 // Command returns the protocol command string for the message.  This is part
 // of the Message interface implementation.
 func (msg *MsgNotFound) Command() string {
-	return cmdNotFound
+	return CmdNotFound
 }
 
 // MaxPayloadLength returns the maximum length the payload can be for the

msgping.go

@@ -60,7 +60,7 @@ func (msg *MsgPing) BtcEncode(w io.Writer, pver uint32) error {
 // Command returns the protocol command string for the message.  This is part
 // of the Message interface implementation.
 func (msg *MsgPing) Command() string {
-	return cmdPing
+	return CmdPing
 }
 
 // MaxPayloadLength returns the maximum length the payload can be for the

msgpong.go

@@ -61,7 +61,7 @@ func (msg *MsgPong) BtcEncode(w io.Writer, pver uint32) error {
 // Command returns the protocol command string for the message.  This is part
 // of the Message interface implementation.
 func (msg *MsgPong) Command() string {
-	return cmdPong
+	return CmdPong
 }
 
 // MaxPayloadLength returns the maximum length the payload can be for the

msgreject.go

@@ -52,7 +52,7 @@ func (code RejectCode) String() string {
 // This message was not added until protocol version RejectVersion.
 type MsgReject struct {
 	// Cmd is the command for the message which was rejected such as
-	// as cmdBlock or cmdTx.  This can be obtained from the Command function
+	// as CmdBlock or CmdTx.  This can be obtained from the Command function
 	// of a Message.
 	Cmd string
 
@@ -99,9 +99,9 @@ func (msg *MsgReject) BtcDecode(r io.Reader, pver uint32) error {
 	}
 	msg.Reason = reason
 
-	// cmdBlock and cmdTx messages have an additional hash field that
+	// CmdBlock and CmdTx messages have an additional hash field that
 	// identifies the specific block or transaction.
-	if msg.Cmd == cmdBlock || msg.Cmd == cmdTx {
+	if msg.Cmd == CmdBlock || msg.Cmd == CmdTx {
 		err := readElement(r, &msg.Hash)
 		if err != nil {
 			return err
@@ -139,9 +139,9 @@ func (msg *MsgReject) BtcEncode(w io.Writer, pver uint32) error {
 		return err
 	}
 
-	// cmdBlock and cmdTx messages have an additional hash field that
+	// CmdBlock and CmdTx messages have an additional hash field that
 	// identifies the specific block or transaction.
-	if msg.Cmd == cmdBlock || msg.Cmd == cmdTx {
+	if msg.Cmd == CmdBlock || msg.Cmd == CmdTx {
 		err := writeElement(w, &msg.Hash)
 		if err != nil {
 			return err
@@ -154,7 +154,7 @@ func (msg *MsgReject) BtcEncode(w io.Writer, pver uint32) error {
 // Command returns the protocol command string for the message.  This is part
 // of the Message interface implementation.
 func (msg *MsgReject) Command() string {
-	return cmdReject
+	return CmdReject
 }
 
 // MaxPayloadLength returns the maximum length the payload can be for the

msgtx.go

@@ -405,7 +405,7 @@ func (msg *MsgTx) SerializeSize() int {
 // Command returns the protocol command string for the message.  This is part
 // of the Message interface implementation.
 func (msg *MsgTx) Command() string {
-	return cmdTx
+	return CmdTx
 }
 
 // MaxPayloadLength returns the maximum length the payload can be for the

msgverack.go

@@ -30,7 +30,7 @@ func (msg *MsgVerAck) BtcEncode(w io.Writer, pver uint32) error {
 // Command returns the protocol command string for the message.  This is part
 // of the Message interface implementation.
 func (msg *MsgVerAck) Command() string {
-	return cmdVerAck
+	return CmdVerAck
 }
 
 // MaxPayloadLength returns the maximum length the payload can be for the

msgversion.go

@@ -206,7 +206,7 @@ func (msg *MsgVersion) BtcEncode(w io.Writer, pver uint32) error {
 // Command returns the protocol command string for the message.  This is part
 // of the Message interface implementation.
 func (msg *MsgVersion) Command() string {
-	return cmdVersion
+	return CmdVersion
 }
 
 // MaxPayloadLength returns the maximum length the payload can be for the