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- // Copyright 2019 The go-ethereum Authors
- // This file is part of the go-ethereum library.
- //
- // The go-ethereum library is free software: you can redistribute it and/or modify
- // it under the terms of the GNU Lesser General Public License as published by
- // the Free Software Foundation, either version 3 of the License, or
- // (at your option) any later version.
- //
- // The go-ethereum library is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- // GNU Lesser General Public License for more details.
- //
- // You should have received a copy of the GNU Lesser General Public License
- // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
- package flowcontrol
- import (
- "fmt"
- "time"
- "github.com/ethereum/go-ethereum/common/mclock"
- )
- // logger collects events in string format and discards events older than the
- // "keep" parameter
- type logger struct {
- events map[uint64]logEvent
- writePtr, delPtr uint64
- keep time.Duration
- }
- // logEvent describes a single event
- type logEvent struct {
- time mclock.AbsTime
- event string
- }
- // newLogger creates a new logger
- func newLogger(keep time.Duration) *logger {
- return &logger{
- events: make(map[uint64]logEvent),
- keep: keep,
- }
- }
- // add adds a new event and discards old events if possible
- func (l *logger) add(now mclock.AbsTime, event string) {
- keepAfter := now - mclock.AbsTime(l.keep)
- for l.delPtr < l.writePtr && l.events[l.delPtr].time <= keepAfter {
- delete(l.events, l.delPtr)
- l.delPtr++
- }
- l.events[l.writePtr] = logEvent{now, event}
- l.writePtr++
- }
- // dump prints all stored events
- func (l *logger) dump(now mclock.AbsTime) {
- for i := l.delPtr; i < l.writePtr; i++ {
- e := l.events[i]
- fmt.Println(time.Duration(e.time-now), e.event)
- }
- }
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