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logreferrer.go
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/
logreferrer.go
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// Copyright 2015-2016 trivago GmbH
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package Log
import (
"fmt"
"io"
"os"
)
type logReferrer struct {
writer io.Writer
}
// Write sends the message to the io.Writer passed to Configure
func (log logReferrer) Write(message []byte) (int, error) {
length := len(message)
if length == 0 {
return 0, nil
}
if message[length-1] == '\n' {
message = message[:length-1]
}
switch {
case log.writer == nil:
fmt.Println(string(message))
return length, nil
case log.writer == os.Stdout || log.writer == os.Stderr:
fmt.Fprintln(log.writer, string(message))
return length, nil
default:
return log.writer.Write(message)
}
}