mirror of https://github.com/k3s-io/k3s
90 lines
1.8 KiB
Go
90 lines
1.8 KiB
Go
// Copyright 2015 CoreOS, 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 wal
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import (
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"bufio"
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"encoding/binary"
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"hash"
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"io"
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"sync"
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"github.com/coreos/etcd/pkg/crc"
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"github.com/coreos/etcd/wal/walpb"
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)
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type encoder struct {
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mu sync.Mutex
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bw *bufio.Writer
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crc hash.Hash32
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buf []byte
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uint64buf []byte
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}
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func newEncoder(w io.Writer, prevCrc uint32) *encoder {
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return &encoder{
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bw: bufio.NewWriter(w),
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crc: crc.New(prevCrc, crcTable),
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// 1MB buffer
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buf: make([]byte, 1024*1024),
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uint64buf: make([]byte, 8),
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}
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}
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func (e *encoder) encode(rec *walpb.Record) error {
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e.mu.Lock()
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defer e.mu.Unlock()
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e.crc.Write(rec.Data)
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rec.Crc = e.crc.Sum32()
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var (
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data []byte
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err error
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n int
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)
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if rec.Size() > len(e.buf) {
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data, err = rec.Marshal()
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if err != nil {
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return err
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}
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} else {
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n, err = rec.MarshalTo(e.buf)
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if err != nil {
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return err
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}
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data = e.buf[:n]
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}
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if err = writeInt64(e.bw, int64(len(data)), e.uint64buf); err != nil {
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return err
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}
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_, err = e.bw.Write(data)
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return err
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}
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func (e *encoder) flush() error {
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e.mu.Lock()
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defer e.mu.Unlock()
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return e.bw.Flush()
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}
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func writeInt64(w io.Writer, n int64, buf []byte) error {
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// http://golang.org/src/encoding/binary/binary.go
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binary.LittleEndian.PutUint64(buf, uint64(n))
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_, err := w.Write(buf)
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return err
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}
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