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message.go
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/
message.go
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package models
import (
"bytes"
"crypto/sha1"
"log"
)
func calcChecksum(b []byte) ([]byte, error) {
hasher := sha1.New()
_, err := hasher.Write(b)
if err != nil {
return []byte{}, err
}
return hasher.Sum(nil), nil
}
type Message struct {
Payload []byte
Checksum []byte
}
func NewMessage(payload []byte) (Message, error) {
msgChecksum, err := calcChecksum(payload)
if err != nil {
return Message{}, err
}
return Message{Payload: payload, Checksum: msgChecksum}, nil
}
func (m Message) IsValid() bool {
msgChecksum, err := calcChecksum(m.Payload)
if err != nil {
log.Println(err)
return false
}
return bytes.Equal(m.Checksum, msgChecksum)
}
func (m Message) Compare(b Message) int {
return bytes.Compare(m.Checksum, b.Checksum)
}
func (m Message) GetPayload() []byte {
return m.Payload
}
func (m Message) GetHash() []byte {
return m.Checksum
}
func (m Message) IsEmpty() bool {
return len(m.Payload) == 0
}