database-filesystem, demo log tailing in term

models/dbfs/dbfs.go

@@ -0,0 +1,74 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package dbfs
+
+import (
+	"context"
+	"os"
+
+	"code.gitea.io/gitea/models/db"
+)
+
+type FileMeta struct {
+	ID              int64  `xorm:"pk autoincr"`
+	FullPath        string `xorm:"VARCHAR(500) UNIQUE NOT NULL"`
+	BlockSize       int64  `xorm:"BIGINT NOT NULL"`
+	FileSize        int64  `xorm:"BIGINT NOT NULL"`
+	CreateTimestamp int64  `xorm:"BIGINT NOT NULL"`
+	ModifyTimestamp int64  `xorm:"BIGINT NOT NULL"`
+}
+
+type FileData struct {
+	ID         int64  `xorm:"pk autoincr"`
+	Revision   int64  `xorm:"BIGINT NOT NULL"`
+	MetaID     int64  `xorm:"BIGINT index(meta_offset) NOT NULL"`
+	BlobOffset int64  `xorm:"BIGINT index(meta_offset) NOT NULL"`
+	BlobSize   int64  `xorm:"BIGINT NOT NULL"`
+	BlobData   []byte `xorm:"BLOB NOT NULL"`
+}
+
+func init() {
+	db.RegisterModel(new(FileMeta))
+	db.RegisterModel(new(FileData))
+}
+
+func OpenFile(ctx context.Context, name string, flag int) (File, error) {
+	f, err := newDbFile(ctx, name)
+	if err != nil {
+		return nil, err
+	}
+	err = f.open(flag)
+	if err != nil {
+		_ = f.Close()
+		return nil, err
+	}
+	return f, nil
+}
+
+func Open(ctx context.Context, name string) (File, error) {
+	return OpenFile(ctx, name, os.O_RDONLY)
+}
+
+func Create(ctx context.Context, name string) (File, error) {
+	return OpenFile(ctx, name, os.O_RDWR|os.O_CREATE|os.O_TRUNC)
+}
+
+func Rename(ctx context.Context, oldPath, newPath string) error {
+	f, err := newDbFile(ctx, oldPath)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	return f.renameTo(newPath)
+}
+
+func Remove(ctx context.Context, name string) error {
+	f, err := newDbFile(ctx, name)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	return f.delete()
+}