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

@@ -0,0 +1,102 @@
+package disk
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"os"
+	"path"
+	"path/filepath"
+	"time"
+)
+
+type writer struct {
+	file   *os.File
+	size   int64
+	count  int64
+	writer *bufio.Writer
+	config *Config
+}
+
+// write data
+func (w *writer) write(data []byte) error {
+	// append newline
+	data = append(data, "\n"...)
+	size := int64(len(data))
+
+	// close current segment for rotate
+	if w.size+size > w.config.SegmentSize {
+		w.close()
+	}
+
+	// create a new segment
+	if w.file == nil {
+		if err := w.open(); err != nil {
+			return err
+		}
+	}
+
+	// write to buffer
+	if _, err := w.writer.Write(data); err != nil {
+		return err
+	}
+
+	w.size += size
+
+	// sync data to disk
+	w.count++
+	if w.count >= w.config.BatchSize {
+		w.sync()
+	}
+
+	return nil
+}
+
+// create a new segment
+func (w *writer) open() (err error) {
+	if w.segmentNum() >= w.config.SegmentLimit {
+		return errors.New("segment num exceeds the limit")
+	}
+
+	name := path.Join(w.config.Path, fmt.Sprintf("%013d.data", time.Now().UnixNano()/1e6))
+	if w.file, err = os.OpenFile(name, os.O_CREATE|os.O_WRONLY, filePerm); err != nil {
+		return err
+	}
+
+	w.size = 0
+	// disable auto flush
+	w.writer = bufio.NewWriterSize(w.file, int(w.config.SegmentSize))
+	w.writer.Reset(w.file)
+	return err
+}
+
+// sync data to disk
+func (w *writer) sync() {
+	if w.writer == nil {
+		return
+	}
+
+	if err := w.writer.Flush(); err == nil {
+		w.count = 0
+	}
+}
+
+// close segment
+func (w *writer) close() {
+	if w.file == nil {
+		return
+	}
+
+	w.sync()
+	if err := w.file.Close(); err != nil {
+		return
+	}
+
+	w.size, w.file, w.writer = 0, nil, nil
+}
+
+// segment num
+func (w *writer) segmentNum() int64 {
+	segments, _ := filepath.Glob(path.Join(w.config.Path, "*.data"))
+	return int64(len(segments))
+}