4deb922c9d
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.
90 lines
2.5 KiB
Go
90 lines
2.5 KiB
Go
// Copyright (c) 2014 Conformal Systems LLC.
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package btcwire
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import (
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"fmt"
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"io"
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)
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const (
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// MaxFilterAddDataSize is the maximum byte size of a data
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// element to add to the Bloom filter. It is equal to the
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// maximum element size of a script.
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MaxFilterAddDataSize = 520
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)
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// MsgFilterAdd implements the Message interface and represents a bitcoin
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// filteradd message. It is used to add a data element to an existing Bloom
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// filter.
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//
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// This message was not added until protocol version BIP0037Version.
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type MsgFilterAdd struct {
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Data []byte
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}
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// BtcDecode decodes r using the bitcoin protocol encoding into the receiver.
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// This is part of the Message interface implementation.
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func (msg *MsgFilterAdd) BtcDecode(r io.Reader, pver uint32) error {
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if pver < BIP0037Version {
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str := fmt.Sprintf("filteradd message invalid for protocol "+
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"version %d", pver)
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return messageError("MsgFilterAdd.BtcDecode", str)
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}
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var err error
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msg.Data, err = readVarBytes(r, pver, MaxFilterAddDataSize,
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"filteradd data")
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if err != nil {
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return err
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}
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return nil
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}
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// BtcEncode encodes the receiver to w using the bitcoin protocol encoding.
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// This is part of the Message interface implementation.
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func (msg *MsgFilterAdd) BtcEncode(w io.Writer, pver uint32) error {
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if pver < BIP0037Version {
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str := fmt.Sprintf("filteradd message invalid for protocol "+
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"version %d", pver)
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return messageError("MsgFilterAdd.BtcEncode", str)
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}
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size := len(msg.Data)
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if size > MaxFilterAddDataSize {
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str := fmt.Sprintf("filteradd size too large for message "+
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"[size %v, max %v]", size, MaxFilterAddDataSize)
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return messageError("MsgFilterAdd.BtcEncode", str)
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}
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err := writeVarBytes(w, pver, msg.Data)
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if err != nil {
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return err
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}
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return nil
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}
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// Command returns the protocol command string for the message. This is part
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// of the Message interface implementation.
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func (msg *MsgFilterAdd) Command() string {
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return CmdFilterAdd
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}
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// MaxPayloadLength returns the maximum length the payload can be for the
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// receiver. This is part of the Message interface implementation.
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func (msg *MsgFilterAdd) MaxPayloadLength(pver uint32) uint32 {
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return uint32(VarIntSerializeSize(MaxFilterAddDataSize)) +
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MaxFilterAddDataSize
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}
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// NewMsgFilterAdd returns a new bitcoin filteradd message that conforms to the
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// Message interface. See MsgFilterAdd for details.
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func NewMsgFilterAdd(data []byte) *MsgFilterAdd {
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return &MsgFilterAdd{
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Data: data,
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}
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}
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