143 lines
2.9 KiB
Go
143 lines
2.9 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package logger
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import (
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"fmt"
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"sync"
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)
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type stdMsg struct {
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level LogLevel
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msg string
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}
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type jsonMsg []byte
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func (m jsonMsg) Level() LogLevel {
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return 0
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}
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func (m jsonMsg) String() string {
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return string(m)
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}
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type LogMsg interface {
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Level() LogLevel
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fmt.Stringer
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}
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func (m stdMsg) Level() LogLevel {
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return m.level
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}
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func (m stdMsg) String() string {
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return m.msg
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}
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var (
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logMessageC = make(chan LogMsg)
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addSystemC = make(chan LogSystem)
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flushC = make(chan chan struct{})
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resetC = make(chan chan struct{})
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)
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func init() {
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go dispatchLoop()
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}
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// each system can buffer this many messages before
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// blocking incoming log messages.
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const sysBufferSize = 500
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func dispatchLoop() {
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var (
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systems []LogSystem
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systemIn []chan LogMsg
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systemWG sync.WaitGroup
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)
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bootSystem := func(sys LogSystem) {
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in := make(chan LogMsg, sysBufferSize)
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systemIn = append(systemIn, in)
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systemWG.Add(1)
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go sysLoop(sys, in, &systemWG)
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}
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for {
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select {
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case msg := <-logMessageC:
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for _, c := range systemIn {
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c <- msg
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}
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case sys := <-addSystemC:
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systems = append(systems, sys)
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bootSystem(sys)
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case waiter := <-resetC:
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// reset means terminate all systems
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for _, c := range systemIn {
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close(c)
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}
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systems = nil
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systemIn = nil
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systemWG.Wait()
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close(waiter)
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case waiter := <-flushC:
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// flush means reboot all systems
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for _, c := range systemIn {
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close(c)
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}
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systemIn = nil
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systemWG.Wait()
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for _, sys := range systems {
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bootSystem(sys)
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}
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close(waiter)
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}
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}
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}
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func sysLoop(sys LogSystem, in <-chan LogMsg, wg *sync.WaitGroup) {
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for msg := range in {
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sys.LogPrint(msg)
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}
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wg.Done()
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}
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// Reset removes all active log systems.
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// It blocks until all current messages have been delivered.
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func Reset() {
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waiter := make(chan struct{})
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resetC <- waiter
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<-waiter
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}
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// Flush waits until all current log messages have been dispatched to
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// the active log systems.
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func Flush() {
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waiter := make(chan struct{})
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flushC <- waiter
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<-waiter
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}
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// AddLogSystem starts printing messages to the given LogSystem.
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func AddLogSystem(sys LogSystem) {
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addSystemC <- sys
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}
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