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https://github.com/gravitational/teleport.git
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rosstimothy
d232e5054d
Implements two new slog.Handlers that attempt to output text in the same format as existing logrus.TextFormatter implementations. The most notable differences are that the order of fields in the json output does NOT match the logrus order and the additional items in text output are NOT sorted alphabetically like they are in logrus. Tests added validate the output roughly matches between the two loggers given the differences noted above. A benchmark test is also included to demonstrate the improvements slog offers over logrus.
84 lines
1.6 KiB
Go
84 lines
1.6 KiB
Go
// Copyright 2022 The Go 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 log
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import "sync"
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// buffer adapted from go/src/fmt/print.go
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type buffer []byte
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// Having an initial size gives a dramatic speedup.
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var bufPool = sync.Pool{
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New: func() any {
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b := make([]byte, 0, 1024)
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return (*buffer)(&b)
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},
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}
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func newBuffer() *buffer {
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return bufPool.Get().(*buffer)
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}
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func (b *buffer) Free() {
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// To reduce peak allocation, return only smaller buffers to the pool.
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const maxBufferSize = 16 << 10
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if cap(*b) <= maxBufferSize {
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*b = (*b)[:0]
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bufPool.Put(b)
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}
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}
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func (b *buffer) Reset() {
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*b = (*b)[:0]
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}
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func (b *buffer) Write(p []byte) (int, error) {
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*b = append(*b, p...)
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return len(p), nil
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}
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func (b *buffer) WriteString(s string) (int, error) {
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*b = append(*b, s...)
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return len(s), nil
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}
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func (b *buffer) WriteByte(c byte) error {
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*b = append(*b, c)
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return nil
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}
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func (b *buffer) WritePosInt(i int) {
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b.WritePosIntWidth(i, 0)
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}
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// WritePosIntWidth writes non-negative integer i to the buffer, padded on the left
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// by zeroes to the given width. Use a width of 0 to omit padding.
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func (b *buffer) WritePosIntWidth(i, width int) {
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// Cheap integer to fixed-width decimal ASCII.
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// Copied from log/log.go.
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if i < 0 {
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panic("negative int")
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}
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// Assemble decimal in reverse order.
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var bb [20]byte
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bp := len(bb) - 1
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for i >= 10 || width > 1 {
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width--
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q := i / 10
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bb[bp] = byte('0' + i - q*10)
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bp--
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i = q
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}
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// i < 10
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bb[bp] = byte('0' + i)
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b.Write(bb[bp:])
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}
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func (b *buffer) String() string {
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return string(*b)
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}
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