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Fix backend data race #102

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Fix backend data race #102

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16 changes: 11 additions & 5 deletions backend.go
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Original file line number Diff line number Diff line change
Expand Up @@ -4,8 +4,12 @@

package logging

import (
"sync/atomic"
)

// defaultBackend is the backend used for all logging calls.
var defaultBackend LeveledBackend
var defaultBackend atomic.Value

// Backend is the interface which a log backend need to implement to be able to
// be used as a logging backend.
Expand All @@ -23,17 +27,19 @@ func SetBackend(backends ...Backend) LeveledBackend {
backend = MultiLogger(backends...)
}

defaultBackend = AddModuleLevel(backend)
return defaultBackend
newDefaultBackend := AddModuleLevel(backend)
defaultBackend.Store(&newDefaultBackend)

return *defaultBackend.Load().(*LeveledBackend)
}

// SetLevel sets the logging level for the specified module. The module
// corresponds to the string specified in GetLogger.
func SetLevel(level Level, module string) {
defaultBackend.SetLevel(level, module)
(*defaultBackend.Load().(*LeveledBackend)).SetLevel(level, module)
}

// GetLevel returns the logging level for the specified module.
func GetLevel(module string) Level {
return defaultBackend.GetLevel(module)
return (*defaultBackend.Load().(*LeveledBackend)).GetLevel(module)
}
4 changes: 2 additions & 2 deletions logger.go
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Original file line number Diff line number Diff line change
Expand Up @@ -137,7 +137,7 @@ func Reset() {

// IsEnabledFor returns true if the logger is enabled for the given level.
func (l *Logger) IsEnabledFor(level Level) bool {
return defaultBackend.IsEnabledFor(level, l.Module)
return (*defaultBackend.Load().(*LeveledBackend)).IsEnabledFor(level, l.Module)
}

func (l *Logger) log(lvl Level, format *string, args ...interface{}) {
Expand Down Expand Up @@ -167,7 +167,7 @@ func (l *Logger) log(lvl Level, format *string, args ...interface{}) {
return
}

defaultBackend.Log(lvl, 2+l.ExtraCalldepth, record)
(*defaultBackend.Load().(*LeveledBackend)).Log(lvl, 2+l.ExtraCalldepth, record)
}

// Fatal is equivalent to l.Critical(fmt.Sprint()) followed by a call to os.Exit(1).
Expand Down