/
sync_skew.go
38 lines (33 loc) · 1.16 KB
/
sync_skew.go
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package packet
import (
"encoding/binary"
"fmt"
"math"
)
//SyncSkewPacket requests us to reply with the current skew value
type SyncSkewPacket struct {
ClockRef CFTypeID
CorrelationID uint64
}
//NewSyncSkewPacketFromBytes parses a SyncSkewPacket from bytes
func NewSyncSkewPacketFromBytes(data []byte) (SyncSkewPacket, error) {
_, clockRef, correlationID, err := ParseSyncHeader(data, SKEW)
if err != nil {
return SyncSkewPacket{}, err
}
packet := SyncSkewPacket{ClockRef: clockRef, CorrelationID: correlationID}
return packet, nil
}
//NewReply creates a byte array containing the given skew
func (sp SyncSkewPacket) NewReply(skew float64) []byte {
responseBytes := make([]byte, 28)
binary.LittleEndian.PutUint32(responseBytes, 28)
binary.LittleEndian.PutUint32(responseBytes[4:], ReplyPacketMagic)
binary.LittleEndian.PutUint64(responseBytes[8:], sp.CorrelationID)
binary.LittleEndian.PutUint32(responseBytes[16:], 0)
binary.LittleEndian.PutUint64(responseBytes[20:], math.Float64bits(skew))
return responseBytes
}
func (sp SyncSkewPacket) String() string {
return fmt.Sprintf("SYNC_SKEW{ClockRef:%x, CorrelationID:%x}", sp.ClockRef, sp.CorrelationID)
}