111 lines
2.4 KiB
Go
111 lines
2.4 KiB
Go
package governance
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"sort"
|
|
|
|
"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
|
|
)
|
|
|
|
var (
|
|
errNotEnoughKeys = errors.New("alphabet list in mainnet is too short")
|
|
errNotEqualLen = errors.New("old and new alphabet lists have different length")
|
|
errEmptySidechain = errors.New("sidechain list is empty")
|
|
)
|
|
|
|
// newAlphabetList returns an updated list of sidechain keys with no more than 1\3
|
|
// of new keys from the mainnet list. The function returns `errEmptySidechain` if
|
|
// the sidechain list is empty. The function returns `errNotEnoughKeys` if the mainnet
|
|
// list contains less keys than the sidechain list. The function returns (nil, nil) if
|
|
// the mainnet list contains all keys from the sidechain list.
|
|
//
|
|
// Sorts passed slices.
|
|
func newAlphabetList(sidechain, mainnet keys.PublicKeys) (keys.PublicKeys, error) {
|
|
sort.Sort(sidechain)
|
|
sort.Sort(mainnet)
|
|
|
|
ln := len(sidechain)
|
|
if ln == 0 {
|
|
return nil, errEmptySidechain
|
|
}
|
|
|
|
if len(mainnet) < ln {
|
|
return nil, fmt.Errorf("%w: expecting %d keys", errNotEnoughKeys, ln)
|
|
}
|
|
|
|
hmap := make(map[string]bool, ln)
|
|
result := make(keys.PublicKeys, 0, ln)
|
|
|
|
for _, node := range sidechain {
|
|
hmap[node.Address()] = false
|
|
}
|
|
|
|
newNodes := 0
|
|
newNodeLimit := (ln - 1) / 3
|
|
|
|
for _, node := range mainnet {
|
|
if len(result) == ln {
|
|
break
|
|
}
|
|
|
|
limitReached := newNodes == newNodeLimit
|
|
|
|
mainnetAddr := node.Address()
|
|
if _, ok := hmap[mainnetAddr]; !ok {
|
|
if limitReached {
|
|
continue
|
|
}
|
|
newNodes++
|
|
} else {
|
|
hmap[mainnetAddr] = true
|
|
}
|
|
|
|
result = append(result, node)
|
|
}
|
|
|
|
if newNodes == 0 {
|
|
return nil, nil
|
|
}
|
|
|
|
for _, node := range sidechain {
|
|
if len(result) == ln {
|
|
break
|
|
}
|
|
|
|
if !hmap[node.Address()] {
|
|
result = append(result, node)
|
|
}
|
|
}
|
|
|
|
sort.Sort(result)
|
|
|
|
return result, nil
|
|
}
|
|
|
|
// updateInnerRing function removes `before` keys from `innerRing` and adds
|
|
// `after` keys in the list. If the length of `before` and `after` is not the same,
|
|
// the function returns errNotEqualLen.
|
|
func updateInnerRing(innerRing, before, after keys.PublicKeys) (keys.PublicKeys, error) {
|
|
lnBefore := len(before)
|
|
if lnBefore != len(after) {
|
|
return nil, errNotEqualLen
|
|
}
|
|
|
|
result := make(keys.PublicKeys, 0, len(innerRing))
|
|
|
|
// O(n^2) for 7 nodes is not THAT bad.
|
|
loop:
|
|
for i := range innerRing {
|
|
for j := range before {
|
|
if innerRing[i].Equal(before[j]) {
|
|
result = append(result, after[j])
|
|
continue loop
|
|
}
|
|
}
|
|
result = append(result, innerRing[i])
|
|
}
|
|
|
|
return result, nil
|
|
}
|