49 lines
1.3 KiB
Go
49 lines
1.3 KiB
Go
/* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
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*/
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package device
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import (
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"log"
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"os"
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)
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// A Logger provides logging for a Device.
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// The functions are Printf-style functions.
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// They must be safe for concurrent use.
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// They do not require a trailing newline in the format.
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// If nil, that level of logging will be silent.
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type Logger struct {
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Verbosef func(format string, args ...interface{})
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Errorf func(format string, args ...interface{})
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}
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// Log levels for use with NewLogger.
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const (
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LogLevelSilent = iota
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LogLevelError
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LogLevelVerbose
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)
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// Function for use in Logger for discarding logged lines.
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func DiscardLogf(format string, args ...interface{}) {}
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// NewLogger constructs a Logger that writes to stdout.
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// It logs at the specified log level and above.
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// It decorates log lines with the log level, date, time, and prepend.
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func NewLogger(level int, prepend string) *Logger {
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logger := &Logger{DiscardLogf, DiscardLogf}
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logf := func(prefix string) func(string, ...interface{}) {
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return log.New(os.Stdout, prefix+": "+prepend, log.Ldate|log.Ltime).Printf
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}
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if level >= LogLevelVerbose {
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logger.Verbosef = logf("DEBUG")
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}
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if level >= LogLevelError {
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logger.Errorf = logf("ERROR")
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}
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return logger
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}
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