mirror of
https://github.com/ethereum/go-ethereum.git
synced 2026-06-20 21:54:30 +00:00
537dc5e6fb
* feat: write duration calculation in countdown as interface. add more inputs as function argument * feat: ExpTimeoutDuration * fix: three dots usage * feat: refine exp duration * feat: add exp timeout config and use it in countdown * feat: remove const countdown * feat: remove use of interface in countdown, use error * fix: countdown reset timer problem * fix: add default ExpTimeoutConfig for config
70 lines
1.9 KiB
Go
70 lines
1.9 KiB
Go
// A countdown timer that will mostly be used by XDPoS v2 consensus engine
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package countdown
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import (
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"fmt"
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"math"
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"time"
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"github.com/XinFinOrg/XDPoSChain/core/types"
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)
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const maxExponentUpperbound uint8 = 32
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type ExpTimeoutDuration struct {
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duration time.Duration
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base float64
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maxExponent uint8
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}
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func NewExpTimeoutDuration(duration time.Duration, base float64, maxExponent uint8) (*ExpTimeoutDuration, error) {
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d := &ExpTimeoutDuration{
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duration: duration,
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base: base,
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maxExponent: maxExponent,
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}
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err := d.sanityCheck()
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return d, err
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}
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func (d *ExpTimeoutDuration) sanityCheck() error {
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if d.maxExponent >= maxExponentUpperbound {
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return fmt.Errorf("max_exponent (%d)= >= max_exponent_upperbound (%d)", d.maxExponent, maxExponentUpperbound)
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}
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if math.Pow(d.base, float64(d.maxExponent)) >= float64(math.MaxUint32) {
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return fmt.Errorf("base^max_exponent (%f^%d) should be less than 2^32", d.base, d.maxExponent)
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}
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return nil
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}
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// The inputs should be: currentRound, highestQuorumCert's round
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func (d *ExpTimeoutDuration) GetTimeoutDuration(currentRound, highestRound types.Round) time.Duration {
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power := float64(1)
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// below statement must be true, just to prevent negative result
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if highestRound < currentRound {
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exp := uint8(currentRound-highestRound) - 1
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if exp > d.maxExponent {
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exp = d.maxExponent
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}
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power = math.Pow(d.base, float64(exp))
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}
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return d.duration * time.Duration(power)
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}
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func (d *ExpTimeoutDuration) SetParams(duration time.Duration, base float64, maxExponent uint8) error {
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prevDuration := d.duration
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prevBase := d.base
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prevME := d.maxExponent
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d.duration = duration
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d.base = base
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d.maxExponent = maxExponent
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// if parameters are wrong, should remain instead of change or panic
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if err := d.sanityCheck(); err != nil {
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d.duration = prevDuration
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d.base = prevBase
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d.maxExponent = prevME
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return err
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}
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return nil
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}
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