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45 lines
1.2 KiB
Go
45 lines
1.2 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package logger defines a type for writing to logs. It's just a
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// convenience type so that we don't have to pass verbose func(...)
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// types around.
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package logger
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import (
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"io"
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"log"
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)
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// Logf is the basic Tailscale logger type: a printf-like func.
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// Like log.Printf, the format need not end in a newline.
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type Logf func(format string, args ...interface{})
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// WithPrefix wraps f, prefixing each format with the provided prefix.
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func WithPrefix(f Logf, prefix string) Logf {
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return func(format string, args ...interface{}) {
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f(prefix+format, args...)
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}
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}
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// FuncWriter returns an io.Writer that writes to f.
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func FuncWriter(f Logf) io.Writer {
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return funcWriter{f}
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}
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// StdLogger returns a standard library logger from a Logf.
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func StdLogger(f Logf) *log.Logger {
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return log.New(FuncWriter(f), "", 0)
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}
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type funcWriter struct{ f Logf }
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func (w funcWriter) Write(p []byte) (int, error) {
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w.f("%s", p)
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return len(p), nil
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}
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// Discard is a Logf that throws away the logs given to it.
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func Discard(string, ...interface{}) {}
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