perf(stream): improve file stream range reading and caching mechanism (#1001)

* perf(stream): improve file stream range reading and caching mechanism

* 。

* add bytes_test.go

* fix(stream): handle EOF and buffer reading more gracefully

* 注释

* refactor: update CacheFullAndWriter to accept pointer for UpdateProgress

* update tests

* Update drivers/google_drive/util.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: j2rong4cn <36783515+j2rong4cn@users.noreply.github.com>

* 更优雅的克隆Link

* 修复stream已缓存但无法重复读取

* 将Bytes类型重命名为Reader

* 修复栈溢出

* update tests

---------

Signed-off-by: j2rong4cn <36783515+j2rong4cn@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

internal/stream/stream_test.go

@@ -0,0 +1,86 @@
+package stream
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"testing"
+
+	"github.com/OpenListTeam/OpenList/v4/internal/model"
+	"github.com/OpenListTeam/OpenList/v4/pkg/http_range"
+)
+
+func TestFileStream_RangeRead(t *testing.T) {
+	type args struct {
+		httpRange http_range.Range
+	}
+	buf := []byte("github.com/OpenListTeam/OpenList")
+	f := &FileStream{
+		Obj: &model.Object{
+			Size: int64(len(buf)),
+		},
+		Reader: io.NopCloser(bytes.NewReader(buf)),
+	}
+	tests := []struct {
+		name string
+		f    *FileStream
+		args args
+		want func(f *FileStream, got io.Reader, err error) error
+	}{
+		{
+			name: "range 11-12",
+			f:    f,
+			args: args{
+				httpRange: http_range.Range{Start: 11, Length: 12},
+			},
+			want: func(f *FileStream, got io.Reader, err error) error {
+				if f.GetFile() != nil {
+					return errors.New("cached")
+				}
+				b, _ := io.ReadAll(got)
+				if !bytes.Equal(buf[11:11+12], b) {
+					return fmt.Errorf("=%s ,want =%s", b, buf[11:11+12])
+				}
+				return nil
+			},
+		},
+		{
+			name: "range 11-21",
+			f:    f,
+			args: args{
+				httpRange: http_range.Range{Start: 11, Length: 21},
+			},
+			want: func(f *FileStream, got io.Reader, err error) error {
+				if f.GetFile() == nil {
+					return errors.New("not cached")
+				}
+				b, _ := io.ReadAll(got)
+				if !bytes.Equal(buf[11:11+21], b) {
+					return fmt.Errorf("=%s ,want =%s", b, buf[11:11+21])
+				}
+				return nil
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := tt.f.RangeRead(tt.args.httpRange)
+			if err := tt.want(tt.f, got, err); err != nil {
+				t.Errorf("FileStream.RangeRead() %v", err)
+			}
+		})
+	}
+	t.Run("after check", func(t *testing.T) {
+		if f.GetFile() == nil {
+			t.Error("not cached")
+		}
+		buf2 := make([]byte, len(buf))
+		if _, err := io.ReadFull(f, buf2); err != nil {
+			t.Errorf("FileStream.Read() error = %v", err)
+		}
+		if !bytes.Equal(buf, buf2) {
+			t.Errorf("FileStream.Read() = %s, want %s", buf2, buf)
+		}
+	})
+}