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package transaction
import (
"crypto/sha1"
"fmt"
"hash"
)
const (
// voteSize is the number of bytes of a vote.
voteSize = sha1.Size
)
// Vote is a vote cast by a node.
type Vote [voteSize]byte
// Bytes returns a byte slice containing the hash.
func (v Vote) Bytes() []byte {
return v[:]
}
// VoteFromHash converts the given byte slice containing a hash into a vote.
func VoteFromHash(bytes []byte) (Vote, error) {
if len(bytes) != voteSize {
return Vote{}, fmt.Errorf("invalid vote length %d", len(bytes))
}
var vote Vote
copy(vote[:], bytes)
return vote, nil
}
// VoteFromData hashes the given data and converts it to a vote.
func VoteFromData(data []byte) Vote {
return sha1.Sum(data)
}
// VoteHash is the hash structure used to compute a Vote from arbitrary data.
type VoteHash struct {
hash.Hash
}
// NewVoteHash returns a new VoteHash.
func NewVoteHash() VoteHash {
return VoteHash{sha1.New()}
}
// Vote hashes all data written into VoteHash and returns the resulting Vote.
func (v VoteHash) Vote() (Vote, error) {
return VoteFromHash(v.Sum(nil))
}
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