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server/internal/library/queue/disk/disk.go

@@ -0,0 +1,118 @@
+package disk
+
+import (
+	"context"
+	"errors"
+	"io"
+	"os"
+	"sync"
+	"time"
+)
+
+const (
+	filePerm  = 0600     // 数据写入权限
+	indexFile = ".index" // 消息索引文件
+)
+
+type Config struct {
+	GroupName    string        // 组群名称
+	Path         string        // 数据存放路径
+	BatchSize    int64         // 每N条消息同步一次，batchSize和batchTime满足其一就会同步一次
+	BatchTime    time.Duration // 每N秒消息同步一次
+	SegmentSize  int64         // 每个topic分片数据文件最大字节
+	SegmentLimit int64         // 每个topic最大分片数据文件数量
+}
+
+type Queue struct {
+	sync.RWMutex
+	close  bool
+	ticker *time.Ticker
+	wg     *sync.WaitGroup
+	ctx    context.Context
+	cancel context.CancelFunc
+	writer *writer
+	reader *reader
+}
+
+func New(config *Config) (queue *Queue, err error) {
+	if _, err = os.Stat(config.Path); err != nil {
+		return
+	}
+	queue = &Queue{close: false, wg: &sync.WaitGroup{}, writer: &writer{config: config}, reader: &reader{config: config}}
+	queue.ticker = time.NewTicker(config.BatchTime)
+	queue.ctx, queue.cancel = context.WithCancel(context.TODO())
+	err = queue.reader.restore()
+	if err != nil {
+		return
+	}
+	go queue.sync()
+	return
+}
+
+// Write data
+func (q *Queue) Write(data []byte) error {
+	if q.close {
+		return errors.New("closed")
+	}
+
+	q.Lock()
+	defer q.Unlock()
+
+	return q.writer.write(data)
+}
+
+// Read data
+func (q *Queue) Read() (int64, int64, []byte, error) {
+	if q.close {
+		return 0, 0, nil, errors.New("closed")
+	}
+
+	q.RLock()
+	defer q.RUnlock()
+
+	index, offset, data, err := q.reader.read()
+	if err == io.EOF && (q.writer.file == nil || q.reader.file.Name() != q.writer.file.Name()) {
+		_ = q.reader.safeRotate()
+	}
+	return index, offset, data, err
+}
+
+// Commit index and offset
+func (q *Queue) Commit(index int64, offset int64) {
+	if q.close {
+		return
+	}
+
+	ck := &q.reader.checkpoint
+	ck.Index, ck.Offset = index, offset
+	q.reader.sync()
+}
+
+// Close Queue
+func (q *Queue) Close() {
+	if q.close {
+		return
+	}
+
+	q.close = true
+	q.cancel()
+	q.wg.Wait()
+	q.writer.close()
+	q.reader.close()
+}
+
+// sync data
+func (q *Queue) sync() {
+	q.wg.Add(1)
+	defer q.wg.Done()
+	for {
+		select {
+		case <-q.ticker.C:
+			q.Lock()
+			q.writer.sync()
+			q.Unlock()
+		case <-q.ctx.Done():
+			return
+		}
+	}
+}