kubernetes/vendor/go.uber.org/zap/buffer/buffer.go
Patrick Ohly cb6a653777 klog 2.20.0, logr v1.1.0, zapr v1.1.0
This replaces the experimental logr v0.4 with the stable v1.1.0
release. This is a breaking API change for some users because:
- Comparing logr.Logger against nil is not possible anymore:
  it's now a struct instead of an interface. Code which
  allows a nil logger should switch to *logr.Logger as type.
- Logger implementations must be updated in lockstep.

Instead of updating the forked zapr code in json.go, directly using
the original go-logr/zapr is simpler and avoids duplication of effort.

The updated zapr supports logging of numeric verbosity. Error messages
don't have a verbosity (= always get logged), so "v" is not getting
added to them anymore.

Source code logging for panic messages got fixed so that it references
the code with the invalid log call, not the json.go implementation.

Finally, zapr includes additional information in its panic
messages ("zap field", "ignored key", "invalid key").
2021-09-09 14:43:43 +02:00

142 lines
4.1 KiB
Go

// Copyright (c) 2016 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// Package buffer provides a thin wrapper around a byte slice. Unlike the
// standard library's bytes.Buffer, it supports a portion of the strconv
// package's zero-allocation formatters.
package buffer // import "go.uber.org/zap/buffer"
import (
"strconv"
"time"
)
const _size = 1024 // by default, create 1 KiB buffers
// Buffer is a thin wrapper around a byte slice. It's intended to be pooled, so
// the only way to construct one is via a Pool.
type Buffer struct {
bs []byte
pool Pool
}
// AppendByte writes a single byte to the Buffer.
func (b *Buffer) AppendByte(v byte) {
b.bs = append(b.bs, v)
}
// AppendString writes a string to the Buffer.
func (b *Buffer) AppendString(s string) {
b.bs = append(b.bs, s...)
}
// AppendInt appends an integer to the underlying buffer (assuming base 10).
func (b *Buffer) AppendInt(i int64) {
b.bs = strconv.AppendInt(b.bs, i, 10)
}
// AppendTime appends the time formatted using the specified layout.
func (b *Buffer) AppendTime(t time.Time, layout string) {
b.bs = t.AppendFormat(b.bs, layout)
}
// AppendUint appends an unsigned integer to the underlying buffer (assuming
// base 10).
func (b *Buffer) AppendUint(i uint64) {
b.bs = strconv.AppendUint(b.bs, i, 10)
}
// AppendBool appends a bool to the underlying buffer.
func (b *Buffer) AppendBool(v bool) {
b.bs = strconv.AppendBool(b.bs, v)
}
// AppendFloat appends a float to the underlying buffer. It doesn't quote NaN
// or +/- Inf.
func (b *Buffer) AppendFloat(f float64, bitSize int) {
b.bs = strconv.AppendFloat(b.bs, f, 'f', -1, bitSize)
}
// Len returns the length of the underlying byte slice.
func (b *Buffer) Len() int {
return len(b.bs)
}
// Cap returns the capacity of the underlying byte slice.
func (b *Buffer) Cap() int {
return cap(b.bs)
}
// Bytes returns a mutable reference to the underlying byte slice.
func (b *Buffer) Bytes() []byte {
return b.bs
}
// String returns a string copy of the underlying byte slice.
func (b *Buffer) String() string {
return string(b.bs)
}
// Reset resets the underlying byte slice. Subsequent writes re-use the slice's
// backing array.
func (b *Buffer) Reset() {
b.bs = b.bs[:0]
}
// Write implements io.Writer.
func (b *Buffer) Write(bs []byte) (int, error) {
b.bs = append(b.bs, bs...)
return len(bs), nil
}
// WriteByte writes a single byte to the Buffer.
//
// Error returned is always nil, function signature is compatible
// with bytes.Buffer and bufio.Writer
func (b *Buffer) WriteByte(v byte) error {
b.AppendByte(v)
return nil
}
// WriteString writes a string to the Buffer.
//
// Error returned is always nil, function signature is compatible
// with bytes.Buffer and bufio.Writer
func (b *Buffer) WriteString(s string) (int, error) {
b.AppendString(s)
return len(s), nil
}
// TrimNewline trims any final "\n" byte from the end of the buffer.
func (b *Buffer) TrimNewline() {
if i := len(b.bs) - 1; i >= 0 {
if b.bs[i] == '\n' {
b.bs = b.bs[:i]
}
}
}
// Free returns the Buffer to its Pool.
//
// Callers must not retain references to the Buffer after calling Free.
func (b *Buffer) Free() {
b.pool.put(b)
}