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whisper: Seal function fixed (#16048)

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gluk256 2018-02-09 16:25:03 +01:00 committed by Péter Szilágyi
parent c4712bf96b
commit ccf8083537
1 changed files with 14 additions and 6 deletions
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20
whisper/whisperv6/envelope.go
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@ -77,15 +77,19 @@ func NewEnvelope(ttl uint32, topic TopicType, msg *sentMessage) *Envelope {
// Seal closes the envelope by spending the requested amount of time as a proof
// of work on hashing the data.
func (e *Envelope) Seal(options *MessageParams) error {
var target, bestBit int
if options.PoW == 0 {
// adjust for the duration of Seal() execution only if execution time is predefined unconditionally
// PoW is not required
return nil
}
var target, bestBit int
if options.PoW < 0 {
// target is not set - the function should run for a period
// of time specified in WorkTime param. Since we can predict
// the execution time, we can also adjust Expiry.
e.Expiry += options.WorkTime
} else {
target = e.powToFirstBit(options.PoW)
if target < 1 {
target = 1
}
}
buf := make([]byte, 64)
@ -143,7 +147,11 @@ func (e *Envelope) powToFirstBit(pow float64) int {
x *= float64(e.TTL)
bits := gmath.Log2(x)
bits = gmath.Ceil(bits)
return int(bits)
res := int(bits)
if res < 1 {
res = 1
}
return res
}
// Hash returns the SHA3 hash of the envelope, calculating it if not yet done.