90 lines
2.4 KiB
Go
90 lines
2.4 KiB
Go
// Copyright (c) 2017 Uber Technologies, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package log
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import (
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"bytes"
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"fmt"
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"log"
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"sync"
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)
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// Logger provides an abstract interface for logging from Reporters.
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// Applications can provide their own implementation of this interface to adapt
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// reporters logging to whatever logging library they prefer (stdlib log,
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// logrus, go-logging, etc).
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type Logger interface {
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// Error logs a message at error priority
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Error(msg string)
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// Infof logs a message at info priority
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Infof(msg string, args ...interface{})
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}
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// StdLogger is implementation of the Logger interface that delegates to default `log` package
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var StdLogger = &stdLogger{}
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type stdLogger struct{}
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func (l *stdLogger) Error(msg string) {
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log.Printf("ERROR: %s", msg)
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}
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// Infof logs a message at info priority
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func (l *stdLogger) Infof(msg string, args ...interface{}) {
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log.Printf(msg, args...)
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}
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// NullLogger is implementation of the Logger interface that is no-op
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var NullLogger = &nullLogger{}
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type nullLogger struct{}
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func (l *nullLogger) Error(msg string) {}
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func (l *nullLogger) Infof(msg string, args ...interface{}) {}
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// BytesBufferLogger implements Logger backed by a bytes.Buffer.
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type BytesBufferLogger struct {
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mux sync.Mutex
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buf bytes.Buffer
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}
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// Error implements Logger.
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func (l *BytesBufferLogger) Error(msg string) {
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l.mux.Lock()
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l.buf.WriteString(fmt.Sprintf("ERROR: %s\n", msg))
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l.mux.Unlock()
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}
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// Infof implements Logger.
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func (l *BytesBufferLogger) Infof(msg string, args ...interface{}) {
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l.mux.Lock()
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l.buf.WriteString("INFO: " + fmt.Sprintf(msg, args...) + "\n")
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l.mux.Unlock()
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}
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// String returns string representation of the underlying buffer.
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func (l *BytesBufferLogger) String() string {
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l.mux.Lock()
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defer l.mux.Unlock()
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return l.buf.String()
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}
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// Flush empties the underlying buffer.
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func (l *BytesBufferLogger) Flush() {
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l.mux.Lock()
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defer l.mux.Unlock()
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l.buf.Reset()
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}
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