TrueCloudLab/neoneo-go
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core: fix the way candidates are sorted

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(*NEO).GetCandidates along with getCandidatesCall use candidates sorted
by serialized ECPoint bytes.

(*NEO).computeCommitteeMembers use candidates sorted by votes, and then
by deserialized ECPoint, i.e. using default ECPoint comparator.
This commit is contained in:
Anna Shaleva 2021-06-16 17:31:27 +03:00
parent d5e11e0a75
commit d49294b046
1 changed files with 13 additions and 3 deletions
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16
pkg/core/native/native_neo.go
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@ -821,7 +821,8 @@ func (n *NEO) getCandidates(d dao.DAO, sortByKey bool) ([]keyWithVotes, error) {
}
}
if sortByKey {
sort.Slice(arr, func(i, j int) bool { return strings.Compare(arr[i].Key[1:], arr[j].Key[1:]) == -1 })
// Sort by serialized key bytes (that's the way keys are stored and retrieved from the storage by default).
sort.Slice(arr, func(i, j int) bool { return strings.Compare(arr[i].Key, arr[j].Key) == -1 })
} else {
sort.Slice(arr, func(i, j int) bool {
// The most-voted validators should end up in the front of the list.
@ -829,8 +830,17 @@ func (n *NEO) getCandidates(d dao.DAO, sortByKey bool) ([]keyWithVotes, error) {
if cmp != 0 {
return cmp > 0
}
// Ties are broken with public keys.
return strings.Compare(arr[i].Key[1:], arr[j].Key[1:]) == -1
// Ties are broken with deserialized public keys.
// Sort by ECPoint's (X, Y) components: compare X first, and then compare Y.
cmpX := strings.Compare(arr[i].Key[1:], arr[j].Key[1:])
if cmpX != 0 {
return cmpX == -1
}
// The case when X components are the same is extremely rare, thus we perform
// key deserialization only if needed. No error can occur.
ki, _ := keys.NewPublicKeyFromBytes([]byte(arr[i].Key), elliptic.P256())
kj, _ := keys.NewPublicKeyFromBytes([]byte(arr[j].Key), elliptic.P256())
return ki.Y.Cmp(kj.Y) == -1
})
}
return arr, nil