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nip13: superficial changes.

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This commit is contained in:
fiatjaf 2024-08-20 09:52:35 -03:00
parent b3ca3c1b82
commit 18dbda437b
1 changed files with 8 additions and 13 deletions
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21
nip13/nip13.go
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@ -18,19 +18,15 @@ var (
)
// Difficulty counts the number of leading zero bits in an event ID.
// It returns a negative number if the event ID is malformed.
func Difficulty(eventID string) int {
if len(eventID) != 64 {
return -1
}
func Difficulty(id string) int {
var zeros int
var b [1]byte
for i := 0; i < 64; i += 2 {
if eventID[i:i+2] == "00" {
if id[i:i+2] == "00" {
zeros += 8
continue
}
var b [1]byte
if _, err := hex.Decode(b[:], []byte{eventID[i], eventID[i+1]}); err != nil {
if _, err := hex.Decode(b[:], []byte{id[i], id[i+1]}); err != nil {
return -1
}
zeros += bits.LeadingZeros8(b[0])
@ -43,8 +39,8 @@ func Difficulty(eventID string) int {
// Note that Check performs no validation other than counting leading zero bits
// in an event ID. It is up to the callers to verify the event with other methods,
// such as [nostr.Event.CheckSignature].
func Check(eventID string, minDifficulty int) error {
if Difficulty(eventID) < minDifficulty {
func Check(id string, minDifficulty int) error {
if Difficulty(id) < minDifficulty {
return ErrDifficultyTooLow
}
return nil
@ -64,13 +60,12 @@ func Generate(event *nostr.Event, targetDifficulty int, timeout time.Duration) (
for {
nonce++
tag[1] = strconv.FormatUint(nonce, 10)
event.CreatedAt = nostr.Now()
if Difficulty(event.GetID()) >= targetDifficulty {
return event, nil
}
// benchmarks show one iteration is approx 3000ns on i7-8565U @ 1.8GHz.
// so, check every 3ms; arbitrary
if nonce%1000 == 0 && time.Since(start) > timeout {
// so, check every 30ms; arbitrary
if nonce%10000 == 0 && time.Since(start) > timeout {
return nil, ErrGenerateTimeout
}
}