/
Writer.go
51 lines (44 loc) · 1.03 KB
/
Writer.go
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package ulog
import (
"fmt"
"io"
"os"
"sync"
)
var writersLock = &sync.Mutex{}
// keep track of multiple writers (for adding and replacing)
var writers map[string]io.Writer = map[string]io.Writer{
"default": os.Stdout,
}
// Add or replace a writer
// if name is nil the default writer will be replaced
func SetWriter(_writer io.Writer, name *string) {
writersLock.Lock()
defer writersLock.Unlock()
if name != nil {
writers[*name] = _writer
} else {
writers["default"] = _writer
}
updateLogger()
}
// Remove a writer
func RemoveWriter(name string) error {
writersLock.Lock()
defer writersLock.Unlock()
if _, ok := writers[name]; ok {
delete(writers, name)
updateLogger()
return nil
} else {
return fmt.Errorf("writer with name %s does not exist", name)
}
}
// Internal function to set the loggers output according to all registered writers
func updateLogger() {
allWriters := []io.Writer{}
for _, writer := range writers {
allWriters = append(allWriters, writer)
}
logger.SetOutput(io.MultiWriter(allWriters...))
}