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logger.go
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logger.go
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// Copyright 2018 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)
}
}