highperfocused/go-nostr
1
0
Fork 0
mirror of https://github.com/nbd-wtf/go-nostr.git synced 2025-11-22 12:10:33 +01:00
Code Issues Packages Projects Releases Wiki Activity

negentropy: do the algorithm entirely in hex.

Browse Source 
plus:
  - nicer iterators
  - some optimizations here and there.
  - something else I forgot.
This commit is contained in:
fiatjaf
2024-09-14 16:28:19 -03:00
parent b5f8d48f79
commit 286040c4ce
6 changed files with 293 additions and 194 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
nip77/negentropy/vector.go
View File

@@ -1,7 +1,9 @@
package negentropy
import (
"encoding/hex"
"fmt"
"iter"
"slices"
"github.com/nbd-wtf/go-nostr"
@@ -45,13 +47,14 @@ func (v *Vector) GetBound(idx int) Bound {
return infiniteBound
}
func (v *Vector) Iterate(begin, end int, cb func(Item, int) bool) error {
for i := begin; i < end; i++ {
if !cb(v.items[i], i) {
break
func (v *Vector) Range(begin, end int) iter.Seq2[int, Item] {
return func(yield func(int, Item) bool) {
for i := begin; i < end; i++ {
if !yield(i, v.items[i]) {
break
}
}
}
return nil
}
func (v *Vector) FindLowerBound(begin, end int, bound Bound) int {
@@ -59,16 +62,15 @@ func (v *Vector) FindLowerBound(begin, end int, bound Bound) int {
return begin + idx
}
func (v *Vector) Fingerprint(begin, end int) ([FingerprintSize]byte, error) {
func (v *Vector) Fingerprint(begin, end int) [FingerprintSize]byte {
var out Accumulator
out.SetToZero()
if err := v.Iterate(begin, end, func(item Item, _ int) bool {
out.Add(item.ID)
return true
}); err != nil {
return [FingerprintSize]byte{}, err
tmp := make([]byte, 32)
for _, item := range v.Range(begin, end) {
hex.Decode(tmp, []byte(item.ID))
out.AddBytes(tmp)
}
return out.GetFingerprint(end - begin), nil
return out.GetFingerprint(end - begin)
}