package payload import ( "time" "github.com/nspcc-dev/neo-go/pkg/config/netmode" "github.com/nspcc-dev/neo-go/pkg/io" "github.com/nspcc-dev/neo-go/pkg/network/capability" ) // MaxUserAgentLength is the limit for the user agent field. const MaxUserAgentLength = 1024 // Version payload. type Version struct { // NetMode of the node Magic netmode.Magic // currently the version of the protocol is 0 Version uint32 // timestamp Timestamp uint32 // it's used to distinguish several nodes using the same public IP (or different ones) Nonce uint32 // client id UserAgent []byte // List of available network services Capabilities capability.Capabilities } // NewVersion returns a pointer to a Version payload. func NewVersion(magic netmode.Magic, id uint32, ua string, c []capability.Capability) *Version { return &Version{ Magic: magic, Version: 0, Timestamp: uint32(time.Now().UTC().Unix()), Nonce: id, UserAgent: []byte(ua), Capabilities: c, } } // DecodeBinary implements the Serializable interface. func (p *Version) DecodeBinary(br *io.BinReader) { p.Magic = netmode.Magic(br.ReadU32LE()) p.Version = br.ReadU32LE() p.Timestamp = br.ReadU32LE() p.Nonce = br.ReadU32LE() p.UserAgent = br.ReadVarBytes(MaxUserAgentLength) p.Capabilities.DecodeBinary(br) } // EncodeBinary implements the Serializable interface. func (p *Version) EncodeBinary(bw *io.BinWriter) { bw.WriteU32LE(uint32(p.Magic)) bw.WriteU32LE(p.Version) bw.WriteU32LE(p.Timestamp) bw.WriteU32LE(p.Nonce) bw.WriteVarBytes(p.UserAgent) p.Capabilities.EncodeBinary(bw) }