forked from TrueCloudLab/neoneo-go
0da9fe6946
It's mostly used for Serializable and in other cases where one needs to estimate binary-encoded size of the stucture. This also simplifies future removal of the Size() from Serializable.
86 lines
1.9 KiB
Go
86 lines
1.9 KiB
Go
package payload
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import (
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"time"
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"github.com/CityOfZion/neo-go/pkg/io"
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)
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// Size of the payload not counting UserAgent encoding (which is at least 1 byte
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// for zero-length string)
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const minVersionSize = 27
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// List of Services offered by the node
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const (
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nodePeerService uint64 = 1
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// BloomFilerService uint64 = 2 // Not implemented
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// PrunedNode uint64 = 3 // Not implemented
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// LightNode uint64 = 4 // Not implemented
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)
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// Version payload.
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type Version struct {
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// currently the version of the protocol is 0
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Version uint32
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// currently 1
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Services uint64
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// timestamp
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Timestamp uint32
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// port this server is listening on
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Port uint16
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// it's used to distinguish the node from public IP
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Nonce uint32
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// client id
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UserAgent []byte
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// Height of the block chain
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StartHeight uint32
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// Whether to receive and forward
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Relay bool
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}
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// NewVersion returns a pointer to a Version payload.
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func NewVersion(id uint32, p uint16, ua string, h uint32, r bool) *Version {
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return &Version{
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Version: 0,
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Services: nodePeerService,
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Timestamp: uint32(time.Now().UTC().Unix()),
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Port: p,
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Nonce: id,
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UserAgent: []byte(ua),
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StartHeight: h,
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Relay: r,
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}
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}
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// DecodeBinary implements the Payload interface.
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func (p *Version) DecodeBinary(br *io.BinReader) error {
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br.ReadLE(&p.Version)
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br.ReadLE(&p.Services)
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br.ReadLE(&p.Timestamp)
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br.ReadLE(&p.Port)
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br.ReadLE(&p.Nonce)
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p.UserAgent = br.ReadBytes()
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br.ReadLE(&p.StartHeight)
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br.ReadLE(&p.Relay)
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return br.Err
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}
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// EncodeBinary implements the Payload interface.
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func (p *Version) EncodeBinary(br *io.BinWriter) error {
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br.WriteLE(p.Version)
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br.WriteLE(p.Services)
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br.WriteLE(p.Timestamp)
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br.WriteLE(p.Port)
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br.WriteLE(p.Nonce)
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br.WriteBytes(p.UserAgent)
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br.WriteLE(p.StartHeight)
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br.WriteLE(&p.Relay)
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return br.Err
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}
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// Size implements the payloader interface.
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func (p *Version) Size() uint32 {
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return uint32(minVersionSize + io.GetVarSize(p.UserAgent))
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}
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