- 修改记录存储格式为 [4B len][8B offset][4B CRC][16B UUID][data] - 修复 TopicProcessor 中 WaitGroup 使用错误导致 handler 不执行的问题 - 修复写入保护逻辑,避免 dirtyOffset=-1 时误判为写入中 - 添加统计信息定期持久化功能 - 改进 UTF-8 字符截断处理,防止 CJK 字符乱码 - 优化 Web UI:显示人类可读的文件大小,支持点击外部关闭弹窗 - 重构示例代码,添加 webui 和 webui_integration 示例 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
111 lines
2.5 KiB
Go
111 lines
2.5 KiB
Go
package seqlog
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import (
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"encoding/binary"
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"hash/crc32"
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"os"
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"sync"
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"github.com/google/uuid"
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)
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// LogWriter 日志写入器
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type LogWriter struct {
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fd *os.File
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off int64 // 当前写入偏移
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dirtyOff int64 // 最后一次写入偏移
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wbuf []byte // 8 MiB 复用
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index *RecordIndex // 索引管理器(可选)
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mu sync.RWMutex // 保护 off 字段
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}
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// NewLogWriter 创建一个新的日志写入器
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// index: 外部提供的索引管理器,用于在多个组件间共享
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func NewLogWriter(path string, index *RecordIndex) (*LogWriter, error) {
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if index == nil {
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return nil, os.ErrInvalid
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}
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fd, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0644)
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if err != nil {
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return nil, err
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}
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off, _ := fd.Seek(0, 2) // 跳到尾部
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w := &LogWriter{
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fd: fd,
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off: off,
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dirtyOff: -1,
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wbuf: make([]byte, 0, 8<<20),
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index: index,
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}
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return w, nil
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}
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// Append 追加一条日志记录,返回该记录的偏移量
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func (w *LogWriter) Append(data []byte) (int64, error) {
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w.mu.Lock()
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defer w.mu.Unlock()
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// 记录当前偏移(返回给调用者,用于索引)
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offset := w.off
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w.dirtyOff = offset
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defer func() {
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w.dirtyOff = -1
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}()
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// 生成 UUID v4
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id := uuid.New()
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// 编码:[4B len][8B offset][4B CRC][16B UUID][data]
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buf := w.wbuf[:0]
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buf = binary.LittleEndian.AppendUint32(buf, uint32(len(data)))
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buf = binary.LittleEndian.AppendUint64(buf, uint64(offset))
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buf = binary.LittleEndian.AppendUint32(buf, crc32.ChecksumIEEE(data))
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buf = append(buf, id[:]...)
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buf = append(buf, data...)
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// 落盘 + sync
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if _, err := w.fd.Write(buf); err != nil {
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return 0, err
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}
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if err := w.fd.Sync(); err != nil {
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return 0, err
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}
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// 数据写入成功,立即更新偏移量(保证 w.off 和文件大小一致)
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w.off += int64(len(buf))
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// 更新索引(如果索引失败,数据已持久化,依赖启动时 rebuild 恢复)
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if err := w.index.Append(offset); err != nil {
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// 索引失败不影响 w.off,因为数据已经写入
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return 0, err
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}
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return offset, nil
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}
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// GetWriteOffset 获取当前写入偏移量(线程安全)
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func (w *LogWriter) GetWriteOffset() int64 {
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w.mu.RLock()
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defer w.mu.RUnlock()
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return w.off
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}
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func (w *LogWriter) GetDirtyOffset() int64 {
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w.mu.RLock()
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defer w.mu.RUnlock()
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return w.dirtyOff
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}
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// Close 关闭写入器
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// 注意:不关闭 index,因为 index 是外部管理的共享资源
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func (w *LogWriter) Close() error {
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if w.fd == nil {
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return nil
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}
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return w.fd.Close()
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}
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