wire

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 Go to latest Published: Apr 16, 2021 License: ISC Imports: 14 Imported by: 5

README

wire

[Build Status] (https://travis-ci.org/tinhnguyenhn/colxd) ![ISC License] (http://img.shields.io/badge/license-ISC-blue.svg) [GoDoc] (http://godoc.org/github.com/tinhnguyenhn/colxd/wire)

Package wire implements the bitcoin wire protocol. A comprehensive suite of tests with 100% test coverage is provided to ensure proper functionality.

There is an associated blog post about the release of this package here.

This package has intentionally been designed so it can be used as a standalone package for any projects needing to interface with bitcoin peers at the wire protocol level.

Installation and Updating

$ go get -u github.com/tinhnguyenhn/colxd/wire

Bitcoin Message Overview

The bitcoin protocol consists of exchanging messages between peers. Each message is preceded by a header which identifies information about it such as which bitcoin network it is a part of, its type, how big it is, and a checksum to verify validity. All encoding and decoding of message headers is handled by this package.

To accomplish this, there is a generic interface for bitcoin messages named Message which allows messages of any type to be read, written, or passed around through channels, functions, etc. In addition, concrete implementations of most of the currently supported bitcoin messages are provided. For these supported messages, all of the details of marshalling and unmarshalling to and from the wire using bitcoin encoding are handled so the caller doesn't have to concern themselves with the specifics.

Reading Messages Example

In order to unmarshal bitcoin messages from the wire, use the ReadMessage function. It accepts any io.Reader, but typically this will be a net.Conn to a remote node running a bitcoin peer. Example syntax is:

	// Use the most recent protocol version supported by the package and the
	// main bitcoin network.
	pver := wire.ProtocolVersion
	btcnet := wire.MainNet

	// Reads and validates the next bitcoin message from conn using the
	// protocol version pver and the bitcoin network btcnet.  The returns
	// are a wire.Message, a []byte which contains the unmarshalled
	// raw payload, and a possible error.
	msg, rawPayload, err := wire.ReadMessage(conn, pver, btcnet)
	if err != nil {
		// Log and handle the error
	}

See the package documentation for details on determining the message type.

Writing Messages Example

In order to marshal bitcoin messages to the wire, use the WriteMessage function. It accepts any io.Writer, but typically this will be a net.Conn to a remote node running a bitcoin peer. Example syntax to request addresses from a remote peer is:

	// Use the most recent protocol version supported by the package and the
	// main bitcoin network.
	pver := wire.ProtocolVersion
	btcnet := wire.MainNet

	// Create a new getaddr bitcoin message.
	msg := wire.NewMsgGetAddr()

	// Writes a bitcoin message msg to conn using the protocol version
	// pver, and the bitcoin network btcnet.  The return is a possible
	// error.
	err := wire.WriteMessage(conn, msg, pver, btcnet)
	if err != nil {
		// Log and handle the error
	}

GPG Verification Key

All official release tags are signed by Conformal so users can ensure the code has not been tampered with and is coming from the btcsuite developers. To verify the signature perform the following:

  • Download the public key from the Conformal website at https://opensource.conformal.com/GIT-GPG-KEY-conformal.txt

  • Import the public key into your GPG keyring:

    gpg --import GIT-GPG-KEY-conformal.txt

  • Verify the release tag with the following command where TAG_NAME is a placeholder for the specific tag:

    git tag -v TAG_NAME

License

Package wire is licensed under the copyfree ISC License.

Documentation

Overview

Package wire implements the bitcoin wire protocol.

For the complete details of the bitcoin protocol, see the official wiki entry at https://en.bitcoin.it/wiki/Protocol_specification. The following only serves as a quick overview to provide information on how to use the package.

At a high level, this package provides support for marshalling and unmarshalling supported bitcoin messages to and from the wire. This package does not deal with the specifics of message handling such as what to do when a message is received. This provides the caller with a high level of flexibility.

Bitcoin Message Overview

The bitcoin protocol consists of exchanging messages between peers. Each message is preceded by a header which identifies information about it such as which bitcoin network it is a part of, its type, how big it is, and a checksum to verify validity. All encoding and decoding of message headers is handled by this package.

To accomplish this, there is a generic interface for bitcoin messages named Message which allows messages of any type to be read, written, or passed around through channels, functions, etc. In addition, concrete implementations of most of the currently supported bitcoin messages are provided. For these supported messages, all of the details of marshalling and unmarshalling to and from the wire using bitcoin encoding are handled so the caller doesn't have to concern themselves with the specifics.

Message Interaction

The following provides a quick summary of how the bitcoin messages are intended to interact with one another. As stated above, these interactions are not directly handled by this package. For more in-depth details about the appropriate interactions, see the official bitcoin protocol wiki entry at https://en.bitcoin.it/wiki/Protocol_specification.

The initial handshake consists of two peers sending each other a version message (MsgVersion) followed by responding with a verack message (MsgVerAck). Both peers use the information in the version message (MsgVersion) to negotiate things such as protocol version and supported services with each other. Once the initial handshake is complete, the following chart indicates message interactions in no particular order. 

Peer A Sends                          Peer B Responds
----------------------------------------------------------------------------
getaddr message (MsgGetAddr)          addr message (MsgAddr)
getblocks message (MsgGetBlocks)      inv message (MsgInv)
inv message (MsgInv)                  getdata message (MsgGetData)
getdata message (MsgGetData)          block message (MsgBlock) -or-
                                      tx message (MsgTx) -or-
                                      notfound message (MsgNotFound)
getheaders message (MsgGetHeaders)    headers message (MsgHeaders)
ping message (MsgPing)                pong message (MsgHeaders)* -or-
                                      (none -- Ability to send message is enough)

NOTES:
* The pong message was not added until later protocol versions as defined
  in BIP0031.  The BIP0031Version constant can be used to detect a recent
  enough protocol version for this purpose (version > BIP0031Version).

Common Parameters

There are several common parameters that arise when using this package to read and write bitcoin messages. The following sections provide a quick overview of these parameters so the next sections can build on them.

Protocol Version

The protocol version should be negotiated with the remote peer at a higher level than this package via the version (MsgVersion) message exchange, however, this package provides the wire.ProtocolVersion constant which indicates the latest protocol version this package supports and is typically the value to use for all outbound connections before a potentially lower protocol version is negotiated.

Bitcoin Network

The bitcoin network is a magic number which is used to identify the start of a message and which bitcoin network the message applies to. This package provides the following constants: 

wire.MainNet
wire.TestNet  (Regression test network)
wire.TestNet3 (Test network version 3)
wire.SimNet   (Simulation test network)

Determining Message Type

As discussed in the bitcoin message overview section, this package reads and writes bitcoin messages using a generic interface named Message. In order to determine the actual concrete type of the message, use a type switch or type assertion. An example of a type switch follows: 

// Assumes msg is already a valid concrete message such as one created
// via NewMsgVersion or read via ReadMessage.
switch msg := msg.(type) {
case *wire.MsgVersion:
	// The message is a pointer to a MsgVersion struct.
	fmt.Printf("Protocol version: %v", msg.ProtocolVersion)
case *wire.MsgBlock:
	// The message is a pointer to a MsgBlock struct.
	fmt.Printf("Number of tx in block: %v", msg.Header.TxnCount)
}

Reading Messages

In order to unmarshall bitcoin messages from the wire, use the ReadMessage function. It accepts any io.Reader, but typically this will be a net.Conn to a remote node running a bitcoin peer. Example syntax is: 

// Reads and validates the next bitcoin message from conn using the
// protocol version pver and the bitcoin network btcnet.  The returns
// are a wire.Message, a []byte which contains the unmarshalled
// raw payload, and a possible error.
msg, rawPayload, err := wire.ReadMessage(conn, pver, btcnet)
if err != nil {
	// Log and handle the error
}

Writing Messages

In order to marshall bitcoin messages to the wire, use the WriteMessage function. It accepts any io.Writer, but typically this will be a net.Conn to a remote node running a bitcoin peer. Example syntax to request addresses from a remote peer is: 

// Create a new getaddr bitcoin message.
msg := wire.NewMsgGetAddr()

// Writes a bitcoin message msg to conn using the protocol version
// pver, and the bitcoin network btcnet.  The return is a possible
// error.
err := wire.WriteMessage(conn, msg, pver, btcnet)
if err != nil {
	// Log and handle the error
}

Errors

Errors returned by this package are either the raw errors provided by underlying calls to read/write from streams such as io.EOF, io.ErrUnexpectedEOF, and io.ErrShortWrite, or of type wire.MessageError. This allows the caller to differentiate between general IO errors and malformed messages through type assertions.

Bitcoin Improvement Proposals

This package includes spec changes outlined by the following BIPs: 

BIP0014 (https://github.com/bitcoin/bips/blob/master/bip-0014.mediawiki)
BIP0031 (https://github.com/bitcoin/bips/blob/master/bip-0031.mediawiki)
BIP0035 (https://github.com/bitcoin/bips/blob/master/bip-0035.mediawiki)
BIP0037 (https://github.com/bitcoin/bips/blob/master/bip-0037.mediawiki)
BIP0111	(https://github.com/bitcoin/bips/blob/master/bip-0111.mediawiki)
BIP0130 (https://github.com/bitcoin/bips/blob/master/bip-0130.mediawiki)

Index

Constants

View Source 
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"
	CmdSendHeaders = "sendheaders"
)

Commands used in bitcoin message headers which describe the type of message.

View Source 
const (
	// MaxFilterLoadHashFuncs is the maximum number of hash functions to
	// load into the Bloom filter.
	MaxFilterLoadHashFuncs = 50

	// MaxFilterLoadFilterSize is the maximum size in bytes a filter may be.
	MaxFilterLoadFilterSize = 36000
)
View Source 
const (
	// TxVersion is the current latest supported transaction version.
	TxVersion = 1

	// MaxTxInSequenceNum is the maximum sequence number the sequence field
	// of a transaction input can be.
	MaxTxInSequenceNum uint32 = 0xffffffff

	// MaxPrevOutIndex is the maximum index the index field of a previous
	// outpoint can be.
	MaxPrevOutIndex uint32 = 0xffffffff
)
View Source 
const (
	// ProtocolVersion is the latest protocol version this package supports.
	ProtocolVersion uint32 = 70012

	// MultipleAddressVersion is the protocol version which added multiple
	// addresses per message (pver >= MultipleAddressVersion).
	MultipleAddressVersion uint32 = 209

	// NetAddressTimeVersion is the protocol version which added the
	// timestamp field (pver >= NetAddressTimeVersion).
	NetAddressTimeVersion uint32 = 31402

	// BIP0031Version is the protocol version AFTER which a pong message
	// and nonce field in ping were added (pver > BIP0031Version).
	BIP0031Version uint32 = 60000

	// BIP0035Version is the protocol version which added the mempool
	// message (pver >= BIP0035Version).
	BIP0035Version uint32 = 60002

	// BIP0037Version is the protocol version which added new connection
	// bloom filtering related messages and extended the version message
	// with a relay flag (pver >= BIP0037Version).
	BIP0037Version uint32 = 70001

	// BIP0111Version is the protocol version which added the SFNodeBloom
	// service flag.
	BIP0111Version uint32 = 70011

	// SendHeadersVersion is the protocol version which added a new
	// sendheaders message.
	SendHeadersVersion uint32 = 70012

	// RejectVersion is the protocol version which added a new reject
	// message.
	RejectVersion uint32 = 70002
)
View Source 
const BlockVersion = 4

BlockVersion is the current latest supported block version.

View Source 
const CommandSize = 12

CommandSize is the fixed size of all commands in the common bitcoin message header. Shorter commands must be zero padded.

View Source 
const DefaultUserAgent = "/btcwire:0.4.0/"

DefaultUserAgent for wire in the stack

View Source 
const HashSize = 32

HashSize is the array size used to store sha hashes. See ShaHash.

View Source 
const MaxAddrPerMsg = 1000

MaxAddrPerMsg is the maximum number of addresses that can be in a single bitcoin addr message (MsgAddr).

View Source 
const MaxBlockHeaderPayload = 16 + (HashSize * 2)

MaxBlockHeaderPayload is the maximum number of bytes a block header can be. Version 4 bytes + Timestamp 4 bytes + Bits 4 bytes + Nonce 4 bytes + PrevBlock and MerkleRoot hashes.

View Source 
const MaxBlockHeadersPerMsg = 2000

MaxBlockHeadersPerMsg is the maximum number of block headers that can be in a single bitcoin headers message.

View Source 
const MaxBlockLocatorsPerMsg = 500

MaxBlockLocatorsPerMsg is the maximum number of block locator hashes allowed per message.

View Source 
const MaxBlockPayload = 1000000 // Not actually 1MB which would be 1024 * 1024

MaxBlockPayload is the maximum bytes a block message can be in bytes.

View Source 
const MaxBlocksPerMsg = 500

MaxBlocksPerMsg is the maximum number of blocks allowed per message.

View Source 
const (
	// MaxFilterAddDataSize is the maximum byte size of a data
	// element to add to the Bloom filter.  It is equal to the
	// maximum element size of a script.
	MaxFilterAddDataSize = 520
)
View Source 
const MaxHashStringSize = HashSize * 2

MaxHashStringSize is the maximum length of a ShaHash hash string.

View Source 
const (
	// MaxInvPerMsg is the maximum number of inventory vectors that can be in a
	// single bitcoin inv message.
	MaxInvPerMsg = 50000
)
View Source 
const MaxMessagePayload = (1024 * 1024 * 32) // 32MB

MaxMessagePayload is the maximum bytes a message can be regardless of other individual limits imposed by messages themselves.

View Source 
const MaxUserAgentLen = 2000

MaxUserAgentLen is the maximum allowed length for the user agent field in a version message (MsgVersion).

View Source 
const (
	// MaxVarIntPayload is the maximum payload size for a variable length integer.
	MaxVarIntPayload = 9
)
View Source 
const MessageHeaderSize = 24

MessageHeaderSize is the number of bytes in a bitcoin message header. Bitcoin network (magic) 4 bytes + command 12 bytes + payload length 4 bytes + checksum 4 bytes.

Variables

View Source 
var ErrHashStrSize = fmt.Errorf("max hash string length is %v bytes", MaxHashStringSize)

ErrHashStrSize describes an error that indicates the caller specified a hash string that has too many characters.

View Source 
var ErrInvalidNetAddr = errors.New("provided net.Addr is not a net.TCPAddr")

ErrInvalidNetAddr describes an error that indicates the caller didn't specify a TCP address as required.

Functions

func DoubleSha256 

func DoubleSha256(b []byte) []byte

DoubleSha256 calculates sha256(sha256(b)) and returns the resulting bytes.

func RandomUint64 

func RandomUint64() (uint64, error)

RandomUint64 returns a cryptographically random uint64 value.

func ReadVarBytes 

func ReadVarBytes(r io.Reader, pver uint32, maxAllowed uint32,
	fieldName string) ([]byte, error)

ReadVarBytes reads a variable length byte array. A byte array is encoded as a varInt containing the length of the array followed by the bytes themselves. An error is returned if the length is greater than the passed maxAllowed parameter which helps protect against memory exhuastion attacks and forced panics thorugh malformed messages. The fieldName parameter is only used for the error message so it provides more context in the error.

func ReadVarInt 

func ReadVarInt(r io.Reader, pver uint32) (uint64, error)

ReadVarInt reads a variable length integer from r and returns it as a uint64.

func ReadVarString 

func ReadVarString(r io.Reader, pver uint32) (string, error)

ReadVarString reads a variable length string from r and returns it as a Go string. A variable length string is encoded as a variable length integer containing the length of the string followed by the bytes that represent the string itself. An error is returned if the length is greater than the maximum block payload size since it helps protect against memory exhaustion attacks and forced panics through malformed messages.

func VarIntSerializeSize 

func VarIntSerializeSize(val uint64) int

VarIntSerializeSize returns the number of bytes it would take to serialize val as a variable length integer.

func WriteMessage 

func WriteMessage(w io.Writer, msg Message, pver uint32, btcnet BitcoinNet) error

WriteMessage writes a bitcoin Message to w including the necessary header information. This function is the same as WriteMessageN except it doesn't doesn't return the number of bytes written. This function is mainly provided for backwards compatibility with the original API, but it's also useful for callers that don't care about byte counts.

func WriteMessageN 

func WriteMessageN(w io.Writer, msg Message, pver uint32, btcnet BitcoinNet) (int, error)

WriteMessageN writes a bitcoin Message to w including the necessary header information and returns the number of bytes written. This function is the same as WriteMessage except it also returns the number of bytes written.

func WriteVarBytes 

func WriteVarBytes(w io.Writer, pver uint32, bytes []byte) error

WriteVarBytes serializes a variable length byte array to w as a varInt containing the number of bytes, followed by the bytes themselves.

func WriteVarInt 

func WriteVarInt(w io.Writer, pver uint32, val uint64) error

WriteVarInt serializes val to w using a variable number of bytes depending on its value.

func WriteVarString 

func WriteVarString(w io.Writer, pver uint32, str string) error

WriteVarString serializes str to w as a variable length integer containing the length of the string followed by the bytes that represent the string itself.

Types

type Alert 

type Alert struct {
	// Alert format version
	Version int32

	// Timestamp beyond which nodes should stop relaying this alert
	RelayUntil int64

	// Timestamp beyond which this alert is no longer in effect and
	// should be ignored
	Expiration int64

	// A unique ID number for this alert
	ID int32

	// All alerts with an ID less than or equal to this number should
	// cancelled, deleted and not accepted in the future
	Cancel int32

	// All alert IDs contained in this set should be cancelled as above
	SetCancel []int32

	// This alert only applies to versions greater than or equal to this
	// version. Other versions should still relay it.
	MinVer int32

	// This alert only applies to versions less than or equal to this version.
	// Other versions should still relay it.
	MaxVer int32

	// If this set contains any elements, then only nodes that have their
	// subVer contained in this set are affected by the alert. Other versions
	// should still relay it.
	SetSubVer []string

	// Relative priority compared to other alerts
	Priority int32

	// A comment on the alert that is not displayed
	Comment string

	// The alert message that is displayed to the user
	StatusBar string

	// Reserved
	Reserved string
}

Alert contains the data deserialized from the MsgAlert payload.

func NewAlert 

func NewAlert(version int32, relayUntil int64, expiration int64,
	id int32, cancel int32, setCancel []int32, minVer int32,
	maxVer int32, setSubVer []string, priority int32, comment string,
	statusBar string) *Alert

NewAlert returns an new Alert with values provided.

func NewAlertFromPayload 

func NewAlertFromPayload(serializedPayload []byte, pver uint32) (*Alert, error)

NewAlertFromPayload returns an Alert with values deserialized from the serialized payload.

func (*Alert) Deserialize 

func (alert *Alert) Deserialize(r io.Reader, pver uint32) error

Deserialize decodes from r into the receiver using the alert protocol encoding format.

func (*Alert) Serialize 

func (alert *Alert) Serialize(w io.Writer, pver uint32) error

Serialize encodes the alert to w using the alert protocol encoding format.

type BitcoinNet 

type BitcoinNet uint32

BitcoinNet represents which bitcoin network a message belongs to. 

const (
	// MainNet represents the main bitcoin network.
	MainNet BitcoinNet = 0xd9b4bef9

	// TestNet represents the regression test network.
	TestNet BitcoinNet = 0xdab5bffa

	// TestNet3 represents the test network (version 3).
	TestNet3 BitcoinNet = 0x0709110b

	// SimNet represents the simulation test network.
	SimNet BitcoinNet = 0x12141c16
)

Constants used to indicate the message bitcoin network. They can also be used to seek to the next message when a stream's state is unknown, but this package does not provide that functionality since it's generally a better idea to simply disconnect clients that are misbehaving over TCP.

func (BitcoinNet) String 

func (n BitcoinNet) String() string

String returns the BitcoinNet in human-readable form.

type BlockHeader 

type BlockHeader struct {
	// Version of the block.  This is not the same as the protocol version.
	Version int32

	// Hash of the previous block in the block chain.
	PrevBlock ShaHash

	// Merkle tree reference to hash of all transactions for the block.
	MerkleRoot ShaHash

	// Time the block was created.  This is, unfortunately, encoded as a
	// uint32 on the wire and therefore is limited to 2106.
	Timestamp time.Time

	// Difficulty target for the block.
	Bits uint32

	// Nonce used to generate the block.
	Nonce uint32
}

BlockHeader defines information about a block and is used in the bitcoin block (MsgBlock) and headers (MsgHeaders) messages.

func NewBlockHeader 

func NewBlockHeader(prevHash *ShaHash, merkleRootHash *ShaHash, bits uint32,
	nonce uint32) *BlockHeader

NewBlockHeader returns a new BlockHeader using the provided previous block hash, merkle root hash, difficulty bits, and nonce used to generate the block with defaults for the remaining fields.

func (*BlockHeader) BlockSha 

func (h *BlockHeader) BlockSha() ShaHash

BlockSha computes the block identifier hash for the given block header.

func (*BlockHeader) BtcDecode 

func (h *BlockHeader) BtcDecode(r io.Reader, pver uint32) error

BtcDecode decodes r using the bitcoin protocol encoding into the receiver. This is part of the Message interface implementation. See Deserialize for decoding block headers stored to disk, such as in a database, as opposed to decoding block headers from the wire.

func (*BlockHeader) BtcEncode 

func (h *BlockHeader) BtcEncode(w io.Writer, pver uint32) error

BtcEncode encodes the receiver to w using the bitcoin protocol encoding. This is part of the Message interface implementation. See Serialize for encoding block headers to be stored to disk, such as in a database, as opposed to encoding block headers for the wire.

func (*BlockHeader) Deserialize 

func (h *BlockHeader) Deserialize(r io.Reader) error

Deserialize decodes a block header from r into the receiver using a format that is suitable for long-term storage such as a database while respecting the Version field.

func (*BlockHeader) Serialize 

func (h *BlockHeader) Serialize(w io.Writer) error

Serialize encodes a block header from r into the receiver using a format that is suitable for long-term storage such as a database while respecting the Version field.

type BloomUpdateType 

type BloomUpdateType uint8

BloomUpdateType specifies how the filter is updated when a match is found 

const (
	// BloomUpdateNone indicates the filter is not adjusted when a match is
	// found.
	BloomUpdateNone BloomUpdateType = 0

	// BloomUpdateAll indicates if the filter matches any data element in a
	// public key script, the outpoint is serialized and inserted into the
	// filter.
	BloomUpdateAll BloomUpdateType = 1

	// BloomUpdateP2PubkeyOnly indicates if the filter matches a data
	// element in a public key script and the script is of the standard
	// pay-to-pubkey or multisig, the outpoint is serialized and inserted
	// into the filter.
	BloomUpdateP2PubkeyOnly BloomUpdateType = 2
)

type InvType 

type InvType uint32

InvType represents the allowed types of inventory vectors. See InvVect. 

const (
	InvTypeError         InvType = 0
	InvTypeTx            InvType = 1
	InvTypeBlock         InvType = 2
	InvTypeFilteredBlock InvType = 3
)

These constants define the various supported inventory vector types.

func (InvType) String 

func (invtype InvType) String() string

String returns the InvType in human-readable form.

type InvVect 

type InvVect struct {
	Type InvType // Type of data
	Hash ShaHash // Hash of the data
}

InvVect defines a bitcoin inventory vector which is used to describe data, as specified by the Type field, that a peer wants, has, or does not have to another peer.

func NewInvVect 

func NewInvVect(typ InvType, hash *ShaHash) *InvVect

NewInvVect returns a new InvVect using the provided type and hash.

type Message 

type Message interface {
	BtcDecode(io.Reader, uint32) error
	BtcEncode(io.Writer, uint32) error
	Command() string
	MaxPayloadLength(uint32) uint32
}

Message is an interface that describes a bitcoin message. A type that implements Message has complete control over the representation of its data and may therefore contain additional or fewer fields than those which are used directly in the protocol encoded message.

func ReadMessage 

func ReadMessage(r io.Reader, pver uint32, btcnet BitcoinNet) (Message, []byte, error)

ReadMessage reads, validates, and parses the next bitcoin Message from r for the provided protocol version and bitcoin network. It returns the parsed Message and raw bytes which comprise the message. This function only differs from ReadMessageN in that it doesn't return the number of bytes read. This function is mainly provided for backwards compatibility with the original API, but it's also useful for callers that don't care about byte counts.

func ReadMessageN 

func ReadMessageN(r io.Reader, pver uint32, btcnet BitcoinNet) (int, Message, []byte, error)

ReadMessageN reads, validates, and parses the next bitcoin Message from r for the provided protocol version and bitcoin network. It returns the number of bytes read in addition to the parsed Message and raw bytes which comprise the message. This function is the same as ReadMessage except it also returns the number of bytes read.

type MessageError 

type MessageError struct {
	Func        string // Function name
	Description string // Human readable description of the issue
}

MessageError describes an issue with a message. An example of some potential issues are messages from the wrong bitcoin network, invalid commands, mismatched checksums, and exceeding max payloads.

This provides a mechanism for the caller to type assert the error to differentiate between general io errors such as io.EOF and issues that resulted from malformed messages.

func (*MessageError) Error 

func (e *MessageError) Error() string

Error satisfies the error interface and prints human-readable errors.

type MsgAddr 

type MsgAddr struct {
	AddrList []*NetAddress
}

MsgAddr implements the Message interface and represents a bitcoin addr message. It is used to provide a list of known active peers on the network. An active peer is considered one that has transmitted a message within the last 3 hours. Nodes which have not transmitted in that time frame should be forgotten. Each message is limited to a maximum number of addresses, which is currently 1000. As a result, multiple messages must be used to relay the full list.

Use the AddAddress function to build up the list of known addresses when sending an addr message to another peer.

func NewMsgAddr 

func NewMsgAddr() *MsgAddr

NewMsgAddr returns a new bitcoin addr message that conforms to the Message interface. See MsgAddr for details.

func (*MsgAddr) AddAddress 

func (msg *MsgAddr) AddAddress(na *NetAddress) error

AddAddress adds a known active peer to the message.

func (*MsgAddr) AddAddresses 

func (msg *MsgAddr) AddAddresses(netAddrs ...*NetAddress) error

AddAddresses adds multiple known active peers to the message.

func (*MsgAddr) BtcDecode 

func (msg *MsgAddr) BtcDecode(r io.Reader, pver uint32) error

BtcDecode decodes r using the bitcoin protocol encoding into the receiver. This is part of the Message interface implementation.

func (*MsgAddr) BtcEncode 

func (msg *MsgAddr) BtcEncode(w io.Writer, pver uint32) error

BtcEncode encodes the receiver to w using the bitcoin protocol encoding. This is part of the Message interface implementation.

func (*MsgAddr) ClearAddresses 

func (msg *MsgAddr) ClearAddresses()

ClearAddresses removes all addresses from the message.

func (*MsgAddr) Command 

func (msg *MsgAddr) Command() string

Command returns the protocol command string for the message. This is part of the Message interface implementation.

func (*MsgAddr) MaxPayloadLength 

func (msg *MsgAddr) MaxPayloadLength(pver uint32) uint32

MaxPayloadLength returns the maximum length the payload can be for the receiver. This is part of the Message interface implementation.

type MsgAlert 

type MsgAlert struct {
	// SerializedPayload is the alert payload serialized as a string so that the
	// version can change but the Alert can still be passed on by older
	// clients.
	SerializedPayload []byte

	// Signature is the ECDSA signature of the message.
	Signature []byte

	// Deserialized Payload
	Payload *Alert
}

MsgAlert implements the Message interface and defines a bitcoin alert message.

This is a signed message that provides notifications that the client should display if the signature matches the key. bitcoind/bitcoin-qt only checks against a signature from the core developers.

func NewMsgAlert 

func NewMsgAlert(serializedPayload []byte, signature []byte) *MsgAlert

NewMsgAlert returns a new bitcoin alert message that conforms to the Message interface. See MsgAlert for details.

func (*MsgAlert) BtcDecode 

func (msg *MsgAlert) BtcDecode(r io.Reader, pver uint32) error

BtcDecode decodes r using the bitcoin protocol encoding into the receiver. This is part of the Message interface implementation.

func (*MsgAlert) BtcEncode 

func (msg *MsgAlert) BtcEncode(w io.Writer, pver uint32) error

BtcEncode encodes the receiver to w using the bitcoin protocol encoding. This is part of the Message interface implementation.

func (*MsgAlert) Command 

func (msg *MsgAlert) Command() string

Command returns the protocol command string for the message. This is part of the Message interface implementation.

func (*MsgAlert) MaxPayloadLength 

func (msg *MsgAlert) MaxPayloadLength(pver uint32) uint32

MaxPayloadLength returns the maximum length the payload can be for the receiver. This is part of the Message interface implementation.

type MsgBlock 

type MsgBlock struct {
	Header       BlockHeader
	Transactions []*MsgTx
}

MsgBlock implements the Message interface and represents a bitcoin block message. It is used to deliver block and transaction information in response to a getdata message (MsgGetData) for a given block hash.

func NewMsgBlock 

func NewMsgBlock(blockHeader *BlockHeader) *MsgBlock

NewMsgBlock returns a new bitcoin block message that conforms to the Message interface. See MsgBlock for details.

func (*MsgBlock) AddTransaction 

func (msg *MsgBlock) AddTransaction(tx *MsgTx) error

AddTransaction adds a transaction to the message.

func (*MsgBlock) BlockSha 

func (msg *MsgBlock) BlockSha() ShaHash

BlockSha computes the block identifier hash for this block.

func (*MsgBlock) BtcDecode 

func (msg *MsgBlock) BtcDecode(r io.Reader, pver uint32) error

BtcDecode decodes r using the bitcoin protocol encoding into the receiver. This is part of the Message interface implementation. See Deserialize for decoding blocks stored to disk, such as in a database, as opposed to decoding blocks from the wire.

func (*MsgBlock) BtcEncode 

func (msg *MsgBlock) BtcEncode(w io.Writer, pver uint32) error

BtcEncode encodes the receiver to w using the bitcoin protocol encoding. This is part of the Message interface implementation. See Serialize for encoding blocks to be stored to disk, such as in a database, as opposed to encoding blocks for the wire.

func (*MsgBlock) ClearTransactions 

func (msg *MsgBlock) ClearTransactions()

ClearTransactions removes all transactions from the message.

func (*MsgBlock) Command 

func (msg *MsgBlock) Command() string

Command returns the protocol command string for the message. This is part of the Message interface implementation.

func (*MsgBlock) Deserialize 

func (msg *MsgBlock) Deserialize(r io.Reader) error

Deserialize decodes a block from r into the receiver using a format that is suitable for long-term storage such as a database while respecting the Version field in the block. This function differs from BtcDecode in that BtcDecode decodes from the bitcoin wire protocol as it was sent across the network. The wire encoding can technically differ depending on the protocol version and doesn't even really need to match the format of a stored block at all. As of the time this comment was written, the encoded block is the same in both instances, but there is a distinct difference and separating the two allows the API to be flexible enough to deal with changes.

func (*MsgBlock) DeserializeTxLoc 

func (msg *MsgBlock) DeserializeTxLoc(r *bytes.Buffer) ([]TxLoc, error)

DeserializeTxLoc decodes r in the same manner Deserialize does, but it takes a byte buffer instead of a generic reader and returns a slice containing the start and length of each transaction within the raw data that is being deserialized.

func (*MsgBlock) MaxPayloadLength 

func (msg *MsgBlock) MaxPayloadLength(pver uint32) uint32

MaxPayloadLength returns the maximum length the payload can be for the receiver. This is part of the Message interface implementation.

func (*MsgBlock) Serialize 

func (msg *MsgBlock) Serialize(w io.Writer) error

Serialize encodes the block to w using a format that suitable for long-term storage such as a database while respecting the Version field in the block. This function differs from BtcEncode in that BtcEncode encodes the block to the bitcoin wire protocol in order to be sent across the network. The wire encoding can technically differ depending on the protocol version and doesn't even really need to match the format of a stored block at all. As of the time this comment was written, the encoded block is the same in both instances, but there is a distinct difference and separating the two allows the API to be flexible enough to deal with changes.

func (*MsgBlock) SerializeSize 

func (msg *MsgBlock) SerializeSize() int

SerializeSize returns the number of bytes it would take to serialize the the block.

func (*MsgBlock) TxShas 

func (msg *MsgBlock) TxShas() ([]ShaHash, error)

TxShas returns a slice of hashes of all of transactions in this block.

type MsgFilterAdd 

type MsgFilterAdd struct {
	Data []byte
}

MsgFilterAdd implements the Message interface and represents a bitcoin filteradd message. It is used to add a data element to an existing Bloom filter.

This message was not added until protocol version BIP0037Version.

func NewMsgFilterAdd 

func NewMsgFilterAdd(data []byte) *MsgFilterAdd

NewMsgFilterAdd returns a new bitcoin filteradd message that conforms to the Message interface. See MsgFilterAdd for details.

func (*MsgFilterAdd) BtcDecode 

func (msg *MsgFilterAdd) BtcDecode(r io.Reader, pver uint32) error

BtcDecode decodes r using the bitcoin protocol encoding into the receiver. This is part of the Message interface implementation.

func (*MsgFilterAdd) BtcEncode 

func (msg *MsgFilterAdd) BtcEncode(w io.Writer, pver uint32) error

BtcEncode encodes the receiver to w using the bitcoin protocol encoding. This is part of the Message interface implementation.

func (*MsgFilterAdd) Command 

func (msg *MsgFilterAdd) Command() string

Command returns the protocol command string for the message. This is part of the Message interface implementation.

func (*MsgFilterAdd) MaxPayloadLength 

func (msg *MsgFilterAdd) MaxPayloadLength(pver uint32) uint32

MaxPayloadLength returns the maximum length the payload can be for the receiver. This is part of the Message interface implementation.

type MsgFilterClear 

type MsgFilterClear struct{}

MsgFilterClear implements the Message interface and represents a bitcoin filterclear message which is used to reset a Bloom filter.

This message was not added until protocol version BIP0037Version and has no payload.

func NewMsgFilterClear 

func NewMsgFilterClear() *MsgFilterClear

NewMsgFilterClear returns a new bitcoin filterclear message that conforms to the Message interface. See MsgFilterClear for details.

func (*MsgFilterClear) BtcDecode 

func (msg *MsgFilterClear) BtcDecode(r io.Reader, pver uint32) error

BtcDecode decodes r using the bitcoin protocol encoding into the receiver. This is part of the Message interface implementation.

func (*MsgFilterClear) BtcEncode 

func (msg *MsgFilterClear) BtcEncode(w io.Writer, pver uint32) error

BtcEncode encodes the receiver to w using the bitcoin protocol encoding. This is part of the Message interface implementation.

func (*MsgFilterClear) Command 

func (msg *MsgFilterClear) Command() string

Command returns the protocol command string for the message. This is part of the Message interface implementation.

func (*MsgFilterClear) MaxPayloadLength 

func (msg *MsgFilterClear) MaxPayloadLength(pver uint32) uint32

MaxPayloadLength returns the maximum length the payload can be for the receiver. This is part of the Message interface implementation.

type MsgFilterLoad 

type MsgFilterLoad struct {
	Filter    []byte
	HashFuncs uint32
	Tweak     uint32
	Flags     BloomUpdateType
}

MsgFilterLoad implements the Message interface and represents a bitcoin filterload message which is used to reset a Bloom filter.

This message was not added until protocol version BIP0037Version.

func NewMsgFilterLoad 

func NewMsgFilterLoad(filter []byte, hashFuncs uint32, tweak uint32, flags BloomUpdateType) *MsgFilterLoad

NewMsgFilterLoad returns a new bitcoin filterload message that conforms to the Message interface. See MsgFilterLoad for details.

func (*MsgFilterLoad) BtcDecode 

func (msg *MsgFilterLoad) BtcDecode(r io.Reader, pver uint32) error

BtcDecode decodes r using the bitcoin protocol encoding into the receiver. This is part of the Message interface implementation.

func (*MsgFilterLoad) BtcEncode 

func (msg *MsgFilterLoad) BtcEncode(w io.Writer, pver uint32) error

BtcEncode encodes the receiver to w using the bitcoin protocol encoding. This is part of the Message interface implementation.

func (*MsgFilterLoad) Command 

func (msg *MsgFilterLoad) Command() string

Command returns the protocol command string for the message. This is part of the Message interface implementation.

func (*MsgFilterLoad) MaxPayloadLength 

func (msg *MsgFilterLoad) MaxPayloadLength(pver uint32) uint32

MaxPayloadLength returns the maximum length the payload can be for the receiver. This is part of the Message interface implementation.

type MsgGetAddr 

type MsgGetAddr struct{}

MsgGetAddr implements the Message interface and represents a bitcoin getaddr message. It is used to request a list of known active peers on the network from a peer to help identify potential nodes. The list is returned via one or more addr messages (MsgAddr).

This message has no payload.

func NewMsgGetAddr 

func NewMsgGetAddr() *MsgGetAddr

NewMsgGetAddr returns a new bitcoin getaddr message that conforms to the Message interface. See MsgGetAddr for details.

func (*MsgGetAddr) BtcDecode 

func (msg *MsgGetAddr) BtcDecode(r io.Reader, pver uint32) error

BtcDecode decodes r using the bitcoin protocol encoding into the receiver. This is part of the Message interface implementation.

func (*MsgGetAddr) BtcEncode 

func (msg *MsgGetAddr) BtcEncode(w io.Writer, pver uint32) error

BtcEncode encodes the receiver to w using the bitcoin protocol encoding. This is part of the Message interface implementation.

func (*MsgGetAddr) Command 

func (msg *MsgGetAddr) Command() string

Command returns the protocol command string for the message. This is part of the Message interface implementation.

func (*MsgGetAddr) MaxPayloadLength 

func (msg *MsgGetAddr) MaxPayloadLength(pver uint32) uint32

MaxPayloadLength returns the maximum length the payload can be for the receiver. This is part of the Message interface implementation.

type MsgGetBlocks 

type MsgGetBlocks struct {
	ProtocolVersion    uint32
	BlockLocatorHashes []*ShaHash
	HashStop           ShaHash
}

MsgGetBlocks implements the Message interface and represents a bitcoin getblocks message. It is used to request a list of blocks starting after the last known hash in the slice of block locator hashes. The list is returned via an inv message (MsgInv) and is limited by a specific hash to stop at or the maximum number of blocks per message, which is currently 500.

Set the HashStop field to the hash at which to stop and use AddBlockLocatorHash to build up the list of block locator hashes.

The algorithm for building the block locator hashes should be to add the hashes in reverse order until you reach the genesis block. In order to keep the list of locator hashes to a reasonable number of entries, first add the most recent 10 block hashes, then double the step each loop iteration to exponentially decrease the number of hashes the further away from head and closer to the genesis block you get.

func NewMsgGetBlocks 

func NewMsgGetBlocks(hashStop *ShaHash) *MsgGetBlocks

NewMsgGetBlocks returns a new bitcoin getblocks message that conforms to the Message interface using the passed parameters and defaults for the remaining fields.

func (*MsgGetBlocks) AddBlockLocatorHash 

func (msg *MsgGetBlocks) AddBlockLocatorHash(hash *ShaHash) error

AddBlockLocatorHash adds a new block locator hash to the message.

func (*MsgGetBlocks) BtcDecode 

func (msg *MsgGetBlocks) BtcDecode(r io.Reader, pver uint32) error

BtcDecode decodes r using the bitcoin protocol encoding into the receiver. This is part of the Message interface implementation.

func (*MsgGetBlocks) BtcEncode 

func (msg *MsgGetBlocks) BtcEncode(w io.Writer, pver uint32) error

BtcEncode encodes the receiver to w using the bitcoin protocol encoding. This is part of the Message interface implementation.

func (*MsgGetBlocks) Command 

func (msg *MsgGetBlocks) Command() string

Command returns the protocol command string for the message. This is part of the Message interface implementation.

func (*MsgGetBlocks) MaxPayloadLength 

func (msg *MsgGetBlocks) MaxPayloadLength(pver uint32) uint32

MaxPayloadLength returns the maximum length the payload can be for the receiver. This is part of the Message interface implementation.

type MsgGetData 

type MsgGetData struct {
	InvList []*InvVect
}

MsgGetData implements the Message interface and represents a bitcoin getdata message. It is used to request data such as blocks and transactions from another peer. It should be used in response to the inv (MsgInv) message to request the actual data referenced by each inventory vector the receiving peer doesn't already have. Each message is limited to a maximum number of inventory vectors, which is currently 50,000. As a result, multiple messages must be used to request larger amounts of data.

Use the AddInvVect function to build up the list of inventory vectors when sending a getdata message to another peer.

func NewMsgGetData 

func NewMsgGetData() *MsgGetData

NewMsgGetData returns a new bitcoin getdata message that conforms to the Message interface. See MsgGetData for details.

func NewMsgGetDataSizeHint 

func NewMsgGetDataSizeHint(sizeHint uint) *MsgGetData

NewMsgGetDataSizeHint returns a new bitcoin getdata message that conforms to the Message interface. See MsgGetData for details. This function differs from NewMsgGetData in that it allows a default allocation size for the backing array which houses the inventory vector list. This allows callers who know in advance how large the inventory list will grow to avoid the overhead of growing the internal backing array several times when appending large amounts of inventory vectors with AddInvVect. Note that the specified hint is just that - a hint that is used for the default allocation size. Adding more (or less) inventory vectors will still work properly. The size hint is limited to MaxInvPerMsg.

func (*MsgGetData) AddInvVect 

func (msg *MsgGetData) AddInvVect(iv *InvVect) error

AddInvVect adds an inventory vector to the message.

func (*MsgGetData) BtcDecode 

func (msg *MsgGetData) BtcDecode(r io.Reader, pver uint32) error

BtcDecode decodes r using the bitcoin protocol encoding into the receiver. This is part of the Message interface implementation.

func (*MsgGetData) BtcEncode 

func (msg *MsgGetData) BtcEncode(w io.Writer, pver uint32) error

BtcEncode encodes the receiver to w using the bitcoin protocol encoding. This is part of the Message interface implementation.

func (*MsgGetData) Command 

func (msg *MsgGetData) Command() string

Command returns the protocol command string for the message. This is part of the Message interface implementation.

func (*MsgGetData) MaxPayloadLength 

func (msg *MsgGetData) MaxPayloadLength(pver uint32) uint32

MaxPayloadLength returns the maximum length the payload can be for the receiver. This is part of the Message interface implementation.

type MsgGetHeaders 

type MsgGetHeaders struct {
	ProtocolVersion    uint32
	BlockLocatorHashes []*ShaHash
	HashStop           ShaHash
}

MsgGetHeaders implements the Message interface and represents a bitcoin getheaders message. It is used to request a list of block headers for blocks starting after the last known hash in the slice of block locator hashes. The list is returned via a headers message (MsgHeaders) and is limited by a specific hash to stop at or the maximum number of block headers per message, which is currently 2000.

Set the HashStop field to the hash at which to stop and use AddBlockLocatorHash to build up the list of block locator hashes.

The algorithm for building the block locator hashes should be to add the hashes in reverse order until you reach the genesis block. In order to keep the list of locator hashes to a resonable number of entries, first add the most recent 10 block hashes, then double the step each loop iteration to exponentially decrease the number of hashes the further away from head and closer to the genesis block you get.

func NewMsgGetHeaders 

func NewMsgGetHeaders() *MsgGetHeaders

NewMsgGetHeaders returns a new bitcoin getheaders message that conforms to the Message interface. See MsgGetHeaders for details.

func (*MsgGetHeaders) AddBlockLocatorHash 

func (msg *MsgGetHeaders) AddBlockLocatorHash(hash *ShaHash) error

AddBlockLocatorHash adds a new block locator hash to the message.

func (*MsgGetHeaders) BtcDecode 

func (msg *MsgGetHeaders) BtcDecode(r io.Reader, pver uint32) error

BtcDecode decodes r using the bitcoin protocol encoding into the receiver. This is part of the Message interface implementation.

func (*MsgGetHeaders) BtcEncode 

func (msg *MsgGetHeaders) BtcEncode(w io.Writer, pver uint32) error

BtcEncode encodes the receiver to w using the bitcoin protocol encoding. This is part of the Message interface implementation.

func (*MsgGetHeaders) Command 

func (msg *MsgGetHeaders) Command() string

Command returns the protocol command string for the message. This is part of the Message interface implementation.

func (*MsgGetHeaders) MaxPayloadLength 

func (msg *MsgGetHeaders) MaxPayloadLength(pver uint32) uint32

MaxPayloadLength returns the maximum length the payload can be for the receiver. This is part of the Message interface implementation.

type MsgHeaders 

type MsgHeaders struct {
	Headers []*BlockHeader
}

MsgHeaders implements the Message interface and represents a bitcoin headers message. It is used to deliver block header information in response to a getheaders message (MsgGetHeaders). The maximum number of block headers per message is currently 2000. See MsgGetHeaders for details on requesting the headers.

func NewMsgHeaders 

func NewMsgHeaders() *MsgHeaders

NewMsgHeaders returns a new bitcoin headers message that conforms to the Message interface. See MsgHeaders for details.

func (*MsgHeaders) AddBlockHeader 

func (msg *MsgHeaders) AddBlockHeader(bh *BlockHeader) error

AddBlockHeader adds a new block header to the message.

func (*MsgHeaders) BtcDecode 

func (msg *MsgHeaders) BtcDecode(r io.Reader, pver uint32) error

BtcDecode decodes r using the bitcoin protocol encoding into the receiver. This is part of the Message interface implementation.

func (*MsgHeaders) BtcEncode 

func (msg *MsgHeaders) BtcEncode(w io.Writer, pver uint32) error

BtcEncode encodes the receiver to w using the bitcoin protocol encoding. This is part of the Message interface implementation.

func (*MsgHeaders) Command 

func (msg *MsgHeaders) Command() string

Command returns the protocol command string for the message. This is part of the Message interface implementation.

func (*MsgHeaders) MaxPayloadLength 

func (msg *MsgHeaders) MaxPayloadLength(pver uint32) uint32

MaxPayloadLength returns the maximum length the payload can be for the receiver. This is part of the Message interface implementation.

type MsgInv 

type MsgInv struct {
	InvList []*InvVect
}

MsgInv implements the Message interface and represents a bitcoin inv message. It is used to advertise a peer's known data such as blocks and transactions through inventory vectors. It may be sent unsolicited to inform other peers of the data or in response to a getblocks message (MsgGetBlocks). Each message is limited to a maximum number of inventory vectors, which is currently 50,000.

Use the AddInvVect function to build up the list of inventory vectors when sending an inv message to another peer.

func NewMsgInv 

func NewMsgInv() *MsgInv

NewMsgInv returns a new bitcoin inv message that conforms to the Message interface. See MsgInv for details.

func NewMsgInvSizeHint 

func NewMsgInvSizeHint(sizeHint uint) *MsgInv

NewMsgInvSizeHint returns a new bitcoin inv message that conforms to the Message interface. See MsgInv for details. This function differs from NewMsgInv in that it allows a default allocation size for the backing array which houses the inventory vector list. This allows callers who know in advance how large the inventory list will grow to avoid the overhead of growing the internal backing array several times when appending large amounts of inventory vectors with AddInvVect. Note that the specified hint is just that - a hint that is used for the default allocation size. Adding more (or less) inventory vectors will still work properly. The size hint is limited to MaxInvPerMsg.

func (*MsgInv) AddInvVect 

func (msg *MsgInv) AddInvVect(iv *InvVect) error

AddInvVect adds an inventory vector to the message.

func (*MsgInv) BtcDecode 

func (msg *MsgInv) BtcDecode(r io.Reader, pver uint32) error

BtcDecode decodes r using the bitcoin protocol encoding into the receiver. This is part of the Message interface implementation.

func (*MsgInv) BtcEncode 

func (msg *MsgInv) BtcEncode(w io.Writer, pver uint32) error

BtcEncode encodes the receiver to w using the bitcoin protocol encoding. This is part of the Message interface implementation.

func (*MsgInv) Command 

func (msg *MsgInv) Command() string

Command returns the protocol command string for the message. This is part of the Message interface implementation.

func (*MsgInv) MaxPayloadLength 

func (msg *MsgInv) MaxPayloadLength(pver uint32) uint32

MaxPayloadLength returns the maximum length the payload can be for the receiver. This is part of the Message interface implementation.

type MsgMemPool 

type MsgMemPool struct{}

MsgMemPool implements the Message interface and represents a bitcoin mempool message. It is used to request a list of transactions still in the active memory pool of a relay.

This message has no payload and was not added until protocol versions starting with BIP0035Version.

func NewMsgMemPool 

func NewMsgMemPool() *MsgMemPool

NewMsgMemPool returns a new bitcoin pong message that conforms to the Message interface. See MsgPong for details.

func (*MsgMemPool) BtcDecode 

func (msg *MsgMemPool) BtcDecode(r io.Reader, pver uint32) error

BtcDecode decodes r using the bitcoin protocol encoding into the receiver. This is part of the Message interface implementation.

func (*MsgMemPool) BtcEncode 

func (msg *MsgMemPool) BtcEncode(w io.Writer, pver uint32) error

BtcEncode encodes the receiver to w using the bitcoin protocol encoding. This is part of the Message interface implementation.

func (*MsgMemPool) Command 

func (msg *MsgMemPool) Command() string

Command returns the protocol command string for the message. This is part of the Message interface implementation.

func (*MsgMemPool) MaxPayloadLength 

func (msg *MsgMemPool) MaxPayloadLength(pver uint32) uint32

MaxPayloadLength returns the maximum length the payload can be for the receiver. This is part of the Message interface implementation.

type MsgMerkleBlock 

type MsgMerkleBlock struct {
	Header       BlockHeader
	Transactions uint32
	Hashes       []*ShaHash
	Flags        []byte
}

MsgMerkleBlock implements the Message interface and represents a bitcoin merkleblock message which is used to reset a Bloom filter.

This message was not added until protocol version BIP0037Version.

func NewMsgMerkleBlock 

func NewMsgMerkleBlock(bh *BlockHeader) *MsgMerkleBlock

NewMsgMerkleBlock returns a new bitcoin merkleblock message that conforms to the Message interface. See MsgMerkleBlock for details.

func (*MsgMerkleBlock) AddTxHash 

func (msg *MsgMerkleBlock) AddTxHash(hash *ShaHash) error

AddTxHash adds a new transaction hash to the message.

func (*MsgMerkleBlock) BtcDecode 

func (msg *MsgMerkleBlock) BtcDecode(r io.Reader, pver uint32) error

BtcDecode decodes r using the bitcoin protocol encoding into the receiver. This is part of the Message interface implementation.

func (*MsgMerkleBlock) BtcEncode 

func (msg *MsgMerkleBlock) BtcEncode(w io.Writer, pver uint32) error

BtcEncode encodes the receiver to w using the bitcoin protocol encoding. This is part of the Message interface implementation.

func (*MsgMerkleBlock) Command 

func (msg *MsgMerkleBlock) Command() string

Command returns the protocol command string for the message. This is part of the Message interface implementation.

func (*MsgMerkleBlock) MaxPayloadLength 

func (msg *MsgMerkleBlock) MaxPayloadLength(pver uint32) uint32

MaxPayloadLength returns the maximum length the payload can be for the receiver. This is part of the Message interface implementation.

type MsgNotFound 

type MsgNotFound struct {
	InvList []*InvVect
}

MsgNotFound defines a bitcoin notfound message which is sent in response to a getdata message if any of the requested data in not available on the peer. Each message is limited to a maximum number of inventory vectors, which is currently 50,000.

Use the AddInvVect function to build up the list of inventory vectors when sending a notfound message to another peer.

func NewMsgNotFound 

func NewMsgNotFound() *MsgNotFound

NewMsgNotFound returns a new bitcoin notfound message that conforms to the Message interface. See MsgNotFound for details.

func (*MsgNotFound) AddInvVect 

func (msg *MsgNotFound) AddInvVect(iv *InvVect) error

AddInvVect adds an inventory vector to the message.

func (*MsgNotFound) BtcDecode 

func (msg *MsgNotFound) BtcDecode(r io.Reader, pver uint32) error

BtcDecode decodes r using the bitcoin protocol encoding into the receiver. This is part of the Message interface implementation.

func (*MsgNotFound) BtcEncode 

func (msg *MsgNotFound) BtcEncode(w io.Writer, pver uint32) error

BtcEncode encodes the receiver to w using the bitcoin protocol encoding. This is part of the Message interface implementation.

func (*MsgNotFound) Command 

func (msg *MsgNotFound) Command() string

Command returns the protocol command string for the message. This is part of the Message interface implementation.

func (*MsgNotFound) MaxPayloadLength 

func (msg *MsgNotFound) MaxPayloadLength(pver uint32) uint32

MaxPayloadLength returns the maximum length the payload can be for the receiver. This is part of the Message interface implementation.

type MsgPing 

type MsgPing struct {
	// Unique value associated with message that is used to identify
	// specific ping message.
	Nonce uint64
}

MsgPing implements the Message interface and represents a bitcoin ping message.

For versions BIP0031Version and earlier, it is used primarily to confirm that a connection is still valid. A transmission error is typically interpreted as a closed connection and that the peer should be removed. For versions AFTER BIP0031Version it contains an identifier which can be returned in the pong message to determine network timing.

The payload for this message just consists of a nonce used for identifying it later.

func NewMsgPing 

func NewMsgPing(nonce uint64) *MsgPing

NewMsgPing returns a new bitcoin ping message that conforms to the Message interface. See MsgPing for details.

func (*MsgPing) BtcDecode 

func (msg *MsgPing) BtcDecode(r io.Reader, pver uint32) error

BtcDecode decodes r using the bitcoin protocol encoding into the receiver. This is part of the Message interface implementation.

func (*MsgPing) BtcEncode 

func (msg *MsgPing) BtcEncode(w io.Writer, pver uint32) error

BtcEncode encodes the receiver to w using the bitcoin protocol encoding. This is part of the Message interface implementation.

func (*MsgPing) Command 

func (msg *MsgPing) Command() string

Command returns the protocol command string for the message. This is part of the Message interface implementation.

func (*MsgPing) MaxPayloadLength 

func (msg *MsgPing) MaxPayloadLength(pver uint32) uint32

MaxPayloadLength returns the maximum length the payload can be for the receiver. This is part of the Message interface implementation.

type MsgPong 

type MsgPong struct {
	// Unique value associated with message that is used to identify
	// specific ping message.
	Nonce uint64
}

MsgPong implements the Message interface and represents a bitcoin pong message which is used primarily to confirm that a connection is still valid in response to a bitcoin ping message (MsgPing).

This message was not added until protocol versions AFTER BIP0031Version.

func NewMsgPong 

func NewMsgPong(nonce uint64) *MsgPong

NewMsgPong returns a new bitcoin pong message that conforms to the Message interface. See MsgPong for details.

func (*MsgPong) BtcDecode 

func (msg *MsgPong) BtcDecode(r io.Reader, pver uint32) error

BtcDecode decodes r using the bitcoin protocol encoding into the receiver. This is part of the Message interface implementation.

func (*MsgPong) BtcEncode 

func (msg *MsgPong) BtcEncode(w io.Writer, pver uint32) error

BtcEncode encodes the receiver to w using the bitcoin protocol encoding. This is part of the Message interface implementation.

func (*MsgPong) Command 

func (msg *MsgPong) Command() string

Command returns the protocol command string for the message. This is part of the Message interface implementation.

func (*MsgPong) MaxPayloadLength 

func (msg *MsgPong) MaxPayloadLength(pver uint32) uint32

MaxPayloadLength returns the maximum length the payload can be for the receiver. This is part of the Message interface implementation.

type MsgReject 

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
	// of a Message.
	Cmd string

	// RejectCode is a code indicating why the command was rejected.  It
	// is encoded as a uint8 on the wire.
	Code RejectCode

	// Reason is a human-readable string with specific details (over and
	// above the reject code) about why the command was rejected.
	Reason string

	// Hash identifies a specific block or transaction that was rejected
	// and therefore only applies the MsgBlock and MsgTx messages.
	Hash ShaHash
}

MsgReject implements the Message interface and represents a bitcoin reject message.

This message was not added until protocol version RejectVersion.

func NewMsgReject 

func NewMsgReject(command string, code RejectCode, reason string) *MsgReject

NewMsgReject returns a new bitcoin reject message that conforms to the Message interface. See MsgReject for details.

func (*MsgReject) BtcDecode 

func (msg *MsgReject) BtcDecode(r io.Reader, pver uint32) error

BtcDecode decodes r using the bitcoin protocol encoding into the receiver. This is part of the Message interface implementation.

func (*MsgReject) BtcEncode 

func (msg *MsgReject) BtcEncode(w io.Writer, pver uint32) error

BtcEncode encodes the receiver to w using the bitcoin protocol encoding. This is part of the Message interface implementation.

func (*MsgReject) Command 

func (msg *MsgReject) Command() string

Command returns the protocol command string for the message. This is part of the Message interface implementation.

func (*MsgReject) MaxPayloadLength 

func (msg *MsgReject) MaxPayloadLength(pver uint32) uint32

MaxPayloadLength returns the maximum length the payload can be for the receiver. This is part of the Message interface implementation.

type MsgSendHeaders 

type MsgSendHeaders struct{}

MsgSendHeaders implements the Message interface and represents a bitcoin sendheaders message. It is used to request the peer send block headers rather than inventory vectors.

This message has no payload and was not added until protocol versions starting with SendHeadersVersion.

func NewMsgSendHeaders 

func NewMsgSendHeaders() *MsgSendHeaders

NewMsgSendHeaders returns a new bitcoin sendheaders message that conforms to the Message interface. See MsgSendHeaders for details.

func (*MsgSendHeaders) BtcDecode 

func (msg *MsgSendHeaders) BtcDecode(r io.Reader, pver uint32) error

BtcDecode decodes r using the bitcoin protocol encoding into the receiver. This is part of the Message interface implementation.

func (*MsgSendHeaders) BtcEncode 

func (msg *MsgSendHeaders) BtcEncode(w io.Writer, pver uint32) error

BtcEncode encodes the receiver to w using the bitcoin protocol encoding. This is part of the Message interface implementation.

func (*MsgSendHeaders) Command 

func (msg *MsgSendHeaders) Command() string

Command returns the protocol command string for the message. This is part of the Message interface implementation.

func (*MsgSendHeaders) MaxPayloadLength 

func (msg *MsgSendHeaders) MaxPayloadLength(pver uint32) uint32

MaxPayloadLength returns the maximum length the payload can be for the receiver. This is part of the Message interface implementation.

type MsgTx 

type MsgTx struct {
	Version  int32
	TxIn     []*TxIn
	TxOut    []*TxOut
	LockTime uint32
}

MsgTx implements the Message interface and represents a bitcoin tx message. It is used to deliver transaction information in response to a getdata message (MsgGetData) for a given transaction.

Use the AddTxIn and AddTxOut functions to build up the list of transaction inputs and outputs.

func NewMsgTx 

func NewMsgTx() *MsgTx

NewMsgTx returns a new bitcoin tx message that conforms to the Message interface. The return instance has a default version of TxVersion and there are no transaction inputs or outputs. Also, the lock time is set to zero to indicate the transaction is valid immediately as opposed to some time in future.

func (*MsgTx) AddTxIn 

func (msg *MsgTx) AddTxIn(ti *TxIn)

AddTxIn adds a transaction input to the message.

func (*MsgTx) AddTxOut 

func (msg *MsgTx) AddTxOut(to *TxOut)

AddTxOut adds a transaction output to the message.

func (*MsgTx) BtcDecode 

func (msg *MsgTx) BtcDecode(r io.Reader, pver uint32) error

BtcDecode decodes r using the bitcoin protocol encoding into the receiver. This is part of the Message interface implementation. See Deserialize for decoding transactions stored to disk, such as in a database, as opposed to decoding transactions from the wire.

func (*MsgTx) BtcEncode 

func (msg *MsgTx) BtcEncode(w io.Writer, pver uint32) error

BtcEncode encodes the receiver to w using the bitcoin protocol encoding. This is part of the Message interface implementation. See Serialize for encoding transactions to be stored to disk, such as in a database, as opposed to encoding transactions for the wire.

func (*MsgTx) Command 

func (msg *MsgTx) Command() string

Command returns the protocol command string for the message. This is part of the Message interface implementation.

func (*MsgTx) Copy 

func (msg *MsgTx) Copy() *MsgTx

Copy creates a deep copy of a transaction so that the original does not get modified when the copy is manipulated.

func (*MsgTx) Deserialize 

func (msg *MsgTx) Deserialize(r io.Reader) error

Deserialize decodes a transaction from r into the receiver using a format that is suitable for long-term storage such as a database while respecting the Version field in the transaction. This function differs from BtcDecode in that BtcDecode decodes from the bitcoin wire protocol as it was sent across the network. The wire encoding can technically differ depending on the protocol version and doesn't even really need to match the format of a stored transaction at all. As of the time this comment was written, the encoded transaction is the same in both instances, but there is a distinct difference and separating the two allows the API to be flexible enough to deal with changes.

func (*MsgTx) MaxPayloadLength 

func (msg *MsgTx) MaxPayloadLength(pver uint32) uint32

MaxPayloadLength returns the maximum length the payload can be for the receiver. This is part of the Message interface implementation.

func (*MsgTx) PkScriptLocs 

func (msg *MsgTx) PkScriptLocs() []int

PkScriptLocs returns a slice containing the start of each public key script within the raw serialized transaction. The caller can easily obtain the length of each script by using len on the script available via the appropriate transaction output entry.

func (*MsgTx) Serialize 

func (msg *MsgTx) Serialize(w io.Writer) error

Serialize encodes the transaction to w using a format that suitable for long-term storage such as a database while respecting the Version field in the transaction. This function differs from BtcEncode in that BtcEncode encodes the transaction to the bitcoin wire protocol in order to be sent across the network. The wire encoding can technically differ depending on the protocol version and doesn't even really need to match the format of a stored transaction at all. As of the time this comment was written, the encoded transaction is the same in both instances, but there is a distinct difference and separating the two allows the API to be flexible enough to deal with changes.

func (*MsgTx) SerializeSize 

func (msg *MsgTx) SerializeSize() int

SerializeSize returns the number of bytes it would take to serialize the the transaction.

func (*MsgTx) TxSha 

func (msg *MsgTx) TxSha() ShaHash

TxSha generates the ShaHash name for the transaction.

type MsgVerAck 

type MsgVerAck struct{}

MsgVerAck defines a bitcoin verack message which is used for a peer to acknowledge a version message (MsgVersion) after it has used the information to negotiate parameters. It implements the Message interface.

This message has no payload.

func NewMsgVerAck 

func NewMsgVerAck() *MsgVerAck

NewMsgVerAck returns a new bitcoin verack message that conforms to the Message interface.

func (*MsgVerAck) BtcDecode 

func (msg *MsgVerAck) BtcDecode(r io.Reader, pver uint32) error

BtcDecode decodes r using the bitcoin protocol encoding into the receiver. This is part of the Message interface implementation.

func (*MsgVerAck) BtcEncode 

func (msg *MsgVerAck) BtcEncode(w io.Writer, pver uint32) error

BtcEncode encodes the receiver to w using the bitcoin protocol encoding. This is part of the Message interface implementation.

func (*MsgVerAck) Command 

func (msg *MsgVerAck) Command() string

Command returns the protocol command string for the message. This is part of the Message interface implementation.

func (*MsgVerAck) MaxPayloadLength 

func (msg *MsgVerAck) MaxPayloadLength(pver uint32) uint32

MaxPayloadLength returns the maximum length the payload can be for the receiver. This is part of the Message interface implementation.

type MsgVersion 

type MsgVersion struct {
	// Version of the protocol the node is using.
	ProtocolVersion int32

	// Bitfield which identifies the enabled services.
	Services ServiceFlag

	// Time the message was generated.  This is encoded as an int64 on the wire.
	Timestamp time.Time

	// Address of the remote peer.
	AddrYou NetAddress

	// Address of the local peer.
	AddrMe NetAddress

	// Unique value associated with message that is used to detect self
	// connections.
	Nonce uint64

	// The user agent that generated messsage.  This is a encoded as a varString
	// on the wire.  This has a max length of MaxUserAgentLen.
	UserAgent string

	// Last block seen by the generator of the version message.
	LastBlock int32

	// Don't announce transactions to peer.
	DisableRelayTx bool
}

MsgVersion implements the Message interface and represents a bitcoin version message. It is used for a peer to advertise itself as soon as an outbound connection is made. The remote peer then uses this information along with its own to negotiate. The remote peer must then respond with a version message of its own containing the negotiated values followed by a verack message (MsgVerAck). This exchange must take place before any further communication is allowed to proceed.

func NewMsgVersion 

func NewMsgVersion(me *NetAddress, you *NetAddress, nonce uint64,
	lastBlock int32) *MsgVersion

NewMsgVersion returns a new bitcoin version message that conforms to the Message interface using the passed parameters and defaults for the remaining fields.

func NewMsgVersionFromConn 

func NewMsgVersionFromConn(conn net.Conn, nonce uint64,
	lastBlock int32) (*MsgVersion, error)

NewMsgVersionFromConn is a convenience function that extracts the remote and local address from conn and returns a new bitcoin version message that conforms to the Message interface. See NewMsgVersion.

func (*MsgVersion) AddService 

func (msg *MsgVersion) AddService(service ServiceFlag)

AddService adds service as a supported service by the peer generating the message.

func (*MsgVersion) AddUserAgent 

func (msg *MsgVersion) AddUserAgent(name string, version string,
	comments ...string) error

AddUserAgent adds a user agent to the user agent string for the version message. The version string is not defined to any strict format, although it is recommended to use the form "major.minor.revision" e.g. "2.6.41".

func (*MsgVersion) BtcDecode 

func (msg *MsgVersion) BtcDecode(r io.Reader, pver uint32) error

BtcDecode decodes r using the bitcoin protocol encoding into the receiver. The version message is special in that the protocol version hasn't been negotiated yet. As a result, the pver field is ignored and any fields which are added in new versions are optional. This also mean that r must be a *bytes.Buffer so the number of remaining bytes can be ascertained.

This is part of the Message interface implementation.

func (*MsgVersion) BtcEncode 

func (msg *MsgVersion) BtcEncode(w io.Writer, pver uint32) error

BtcEncode encodes the receiver to w using the bitcoin protocol encoding. This is part of the Message interface implementation.

func (*MsgVersion) Command 

func (msg *MsgVersion) Command() string

Command returns the protocol command string for the message. This is part of the Message interface implementation.

func (*MsgVersion) HasService 

func (msg *MsgVersion) HasService(service ServiceFlag) bool

HasService returns whether the specified service is supported by the peer that generated the message.

func (*MsgVersion) MaxPayloadLength 

func (msg *MsgVersion) MaxPayloadLength(pver uint32) uint32

MaxPayloadLength returns the maximum length the payload can be for the receiver. This is part of the Message interface implementation.

type NetAddress 

type NetAddress struct {
	// Last time the address was seen.  This is, unfortunately, encoded as a
	// uint32 on the wire and therefore is limited to 2106.  This field is
	// not present in the bitcoin version message (MsgVersion) nor was it
	// added until protocol version >= NetAddressTimeVersion.
	Timestamp time.Time

	// Bitfield which identifies the services supported by the address.
	Services ServiceFlag

	// IP address of the peer.
	IP net.IP

	// Port the peer is using.  This is encoded in big endian on the wire
	// which differs from most everything else.
	Port uint16
}

NetAddress defines information about a peer on the network including the time it was last seen, the services it supports, its IP address, and port.

func NewNetAddress 

func NewNetAddress(addr net.Addr, services ServiceFlag) (*NetAddress, error)

NewNetAddress returns a new NetAddress using the provided TCP address and supported services with defaults for the remaining fields.

Note that addr must be a net.TCPAddr. An ErrInvalidNetAddr is returned if it is not.

func NewNetAddressIPPort 

func NewNetAddressIPPort(ip net.IP, port uint16, services ServiceFlag) *NetAddress

NewNetAddressIPPort returns a new NetAddress using the provided IP, port, and supported services with defaults for the remaining fields.

func (*NetAddress) AddService 

func (na *NetAddress) AddService(service ServiceFlag)

AddService adds service as a supported service by the peer generating the message.

func (*NetAddress) HasService 

func (na *NetAddress) HasService(service ServiceFlag) bool

HasService returns whether the specified service is supported by the address.

func (*NetAddress) SetAddress 

func (na *NetAddress) SetAddress(ip net.IP, port uint16)

SetAddress is a convenience function to set the IP address and port in one call.

type OutPoint 

type OutPoint struct {
	Hash  ShaHash
	Index uint32
}

OutPoint defines a bitcoin data type that is used to track previous transaction outputs.

func NewOutPoint 

func NewOutPoint(hash *ShaHash, index uint32) *OutPoint

NewOutPoint returns a new bitcoin transaction outpoint point with the provided hash and index.

func (OutPoint) String 

func (o OutPoint) String() string

String returns the OutPoint in the human-readable form "hash:index".

type RejectCode 

type RejectCode uint8

RejectCode represents a numeric value by which a remote peer indicates why a message was rejected. 

const (
	RejectMalformed       RejectCode = 0x01
	RejectInvalid         RejectCode = 0x10
	RejectObsolete        RejectCode = 0x11
	RejectDuplicate       RejectCode = 0x12
	RejectNonstandard     RejectCode = 0x40
	RejectDust            RejectCode = 0x41
	RejectInsufficientFee RejectCode = 0x42
	RejectCheckpoint      RejectCode = 0x43
)

These constants define the various supported reject codes.

func (RejectCode) String 

func (code RejectCode) String() string

String returns the RejectCode in human-readable form.

type ServiceFlag 

type ServiceFlag uint64

ServiceFlag identifies services supported by a bitcoin peer. 

const (
	// SFNodeNetwork is a flag used to indicate a peer is a full node.
	SFNodeNetwork ServiceFlag = 1 << iota

	// SFNodeGetUTXO is a flag used to indicate a peer supports the
	// getutxos and utxos commands (BIP0064).
	SFNodeGetUTXO

	// SFNodeBloom is a flag used to indiciate a peer supports bloom
	// filtering.
	SFNodeBloom
)

func (ServiceFlag) String 

func (f ServiceFlag) String() string

String returns the ServiceFlag in human-readable form.

type ShaHash 

type ShaHash [HashSize]byte

ShaHash is used in several of the bitcoin messages and common structures. It typically represents the double sha256 of data.

func DoubleSha256SH 

func DoubleSha256SH(b []byte) ShaHash

DoubleSha256SH calculates sha256(sha256(b)) and returns the resulting bytes as a ShaHash.

func NewShaHash 

func NewShaHash(newHash []byte) (*ShaHash, error)

NewShaHash returns a new ShaHash from a byte slice. An error is returned if the number of bytes passed in is not HashSize.

func NewShaHashFromStr 

func NewShaHashFromStr(hash string) (*ShaHash, error)

NewShaHashFromStr creates a ShaHash from a hash string. The string should be the hexadecimal string of a byte-reversed hash, but any missing characters result in zero padding at the end of the ShaHash.

func (*ShaHash) Bytes 

func (hash *ShaHash) Bytes() []byte

Bytes returns the bytes which represent the hash as a byte slice.

NOTE: This makes a copy of the bytes and should have probably been named CloneBytes. It is generally cheaper to just slice the hash directly thereby reusing the same bytes rather than calling this method.

func (*ShaHash) IsEqual 

func (hash *ShaHash) IsEqual(target *ShaHash) bool

IsEqual returns true if target is the same as hash.

func (*ShaHash) SetBytes 

func (hash *ShaHash) SetBytes(newHash []byte) error

SetBytes sets the bytes which represent the hash. An error is returned if the number of bytes passed in is not HashSize.

func (ShaHash) String 

func (hash ShaHash) String() string

String returns the ShaHash as the hexadecimal string of the byte-reversed hash.

type TxIn 

type TxIn struct {
	PreviousOutPoint OutPoint
	SignatureScript  []byte
	Sequence         uint32
}

TxIn defines a bitcoin transaction input.

func NewTxIn 

func NewTxIn(prevOut *OutPoint, signatureScript []byte) *TxIn

NewTxIn returns a new bitcoin transaction input with the provided previous outpoint point and signature script with a default sequence of MaxTxInSequenceNum.

func (*TxIn) SerializeSize 

func (t *TxIn) SerializeSize() int

SerializeSize returns the number of bytes it would take to serialize the the transaction input.

type TxLoc 

type TxLoc struct {
	TxStart int
	TxLen   int
}

TxLoc holds locator data for the offset and length of where a transaction is located within a MsgBlock data buffer.

type TxOut 

type TxOut struct {
	Value    int64
	PkScript []byte
}

TxOut defines a bitcoin transaction output.

func NewTxOut 

func NewTxOut(value int64, pkScript []byte) *TxOut

NewTxOut returns a new bitcoin transaction output with the provided transaction value and public key script.

func (*TxOut) SerializeSize 

func (t *TxOut) SerializeSize() int

SerializeSize returns the number of bytes it would take to serialize the the transaction output.

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