95 lines
2.2 KiB
Go
95 lines
2.2 KiB
Go
package payload
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import (
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"encoding/binary"
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"io"
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. "github.com/anthdm/neo-go/pkg/util"
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)
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// The node can broadcast the object information it owns by this message.
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// The message can be sent automatically or can be used to answer getbloks messages.
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// InventoryType is the type of an object in the Inventory message.
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type InventoryType uint8
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// String implements the Stringer interface.
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func (i InventoryType) String() string {
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switch i {
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case 0x01:
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return "block"
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case 0x02:
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return "TX"
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case 0xe0:
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return "consensus"
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default:
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return "unknown inventory type"
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}
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}
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// Valid returns true if the inventory (type) is known.
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func (i InventoryType) Valid() bool {
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return i == BlockType || i == TXType || i == ConsensusType
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}
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// List of valid InventoryTypes.
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const (
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BlockType InventoryType = 0x01 // 1
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TXType = 0x02 // 2
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ConsensusType = 0xe0 // 224
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)
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// Inventory payload
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type Inventory struct {
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// Type if the object hash.
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Type InventoryType
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// The hash of the object (uint256).
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Hashes []Uint256
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}
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// NewInventory return a pointer to an Inventory.
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func NewInventory(typ InventoryType, hashes []Uint256) *Inventory {
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return &Inventory{
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Type: typ,
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Hashes: hashes,
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}
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}
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// DecodeBinary implements the Payload interface.
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func (p *Inventory) DecodeBinary(r io.Reader) error {
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// TODO: is there a list len?
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// The first byte is the type the second byte seems to be
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// always one on docker privnet.
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var listLen uint8
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err := binary.Read(r, binary.LittleEndian, &p.Type)
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err = binary.Read(r, binary.LittleEndian, &listLen)
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p.Hashes = make([]Uint256, listLen)
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for i := 0; i < int(listLen); i++ {
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if err := binary.Read(r, binary.LittleEndian, &p.Hashes[i]); err != nil {
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return err
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}
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}
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return err
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}
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// EncodeBinary implements the Payload interface.
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func (p *Inventory) EncodeBinary(w io.Writer) error {
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listLen := uint8(len(p.Hashes))
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err := binary.Write(w, binary.LittleEndian, p.Type)
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err = binary.Write(w, binary.LittleEndian, listLen)
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for i := 0; i < len(p.Hashes); i++ {
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if err := binary.Write(w, binary.LittleEndian, p.Hashes[i]); err != nil {
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return err
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}
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}
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return err
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}
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// Size implements the Payloader interface.
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func (p *Inventory) Size() uint32 {
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return 1 + 1 + 32 // ?
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}
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