100 lines
1.8 KiB
Go
100 lines
1.8 KiB
Go
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package logger
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import (
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"sync"
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)
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var (
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logMessageC = make(chan message)
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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 message
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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 message, 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 message, wg *sync.WaitGroup) {
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for msg := range in {
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if sys.GetLogLevel() >= msg.level {
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sys.LogPrint(msg.level, msg.msg)
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}
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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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