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sqlxfs.go
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sqlxfs.go
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package sqlxfs
import (
"database/sql"
"errors"
"fmt"
"io/fs"
"path/filepath"
"time"
"github.com/askasoft/pango/sqx"
"github.com/askasoft/pango/sqx/sqlx"
"github.com/askasoft/pango/str"
"github.com/askasoft/pango/xfs"
)
// sfs implements xfs.XFS interface
type sfs struct {
db sqlx.Sqlx
tn string // table name
}
func FS(db sqlx.Sqlx, table string) xfs.XFS {
return &sfs{db, table}
}
func (sfs *sfs) Open(name string) (fs.File, error) {
f, err := sfs.FindFile(name)
if err != nil {
return nil, err
}
hf := &xfs.FSFile{XFS: sfs, File: f}
return hf, nil
}
// FindFile find a file
func (sfs *sfs) FindFile(id string) (*xfs.File, error) {
s := sfs.db.Rebind("SELECT id, name, ext, size, time FROM " + sfs.tn + " WHERE id = ?")
f := &xfs.File{}
err := sfs.db.Get(f, s, id)
if err != nil {
if errors.Is(err, sqlx.ErrNoRows) {
return nil, fs.ErrNotExist
}
return nil, err
}
return f, nil
}
func (sfs *sfs) SaveFile(id string, filename string, modTime time.Time, data []byte) (*xfs.File, error) {
name := filepath.Base(filename)
fext := str.ToLower(filepath.Ext(filename))
fi := &xfs.File{
ID: id,
Name: name,
Ext: fext,
Size: int64(len(data)),
Time: modTime,
Data: data,
}
var r sql.Result
var err error
if _, err = sfs.FindFile(id); err == nil {
su := sfs.db.Rebind("UPDATE " + sfs.tn + " SET name = ?, ext = ?, size = ?, time = ?, data = ? WHERE id = ?")
ps := []any{fi.Name, fi.Ext, fi.Size, fi.Time, fi.Data, fi.ID}
r, err = sfs.db.Exec(su, ps...)
} else {
si := sfs.db.Rebind("INSERT INTO " + sfs.tn + " (id, name, ext, size, time, data) VALUES (?, ?, ?, ?, ?, ?)")
ps := []any{fi.ID, fi.Name, fi.Ext, fi.Size, fi.Time, fi.Data}
r, err = sfs.db.Exec(si, ps...)
}
if err != nil {
return fi, err
}
n, err := r.RowsAffected()
if err != nil {
return fi, err
}
if n != 1 {
return fi, fs.ErrNotExist
}
return fi, nil
}
func (sfs *sfs) ReadFile(id string) ([]byte, error) {
s := sfs.db.Rebind("SELECT * FROM " + sfs.tn + " WHERE id = ?")
f := &xfs.File{}
err := sfs.db.Get(f, s, id)
if err != nil {
if errors.Is(err, sqlx.ErrNoRows) {
return nil, fs.ErrNotExist
}
return nil, err
}
return f.Data, nil
}
func (sfs *sfs) CopyFile(src, dst string) error {
sql := fmt.Sprintf("INSERT INTO %s (id, name, ext, time, size, data) SELECT ?, name, ext, time, size, data FROM %s WHERE id = ?", sfs.tn, sfs.tn)
sql = sfs.db.Rebind(sql)
r, err := sfs.db.Exec(sql, dst, src)
if err != nil {
return err
}
ra, err := r.RowsAffected()
if err != nil {
return err
}
if ra == 0 {
return fs.ErrNotExist
}
return nil
}
func (sfs *sfs) MoveFile(src, dst string) error {
sql := sfs.db.Rebind("UPDATE " + sfs.tn + " SET id = ? WHERE id = ?")
r, err := sfs.db.Exec(sql, dst, src)
if err != nil {
return err
}
ra, err := r.RowsAffected()
if err != nil {
return err
}
if ra == 0 {
return fs.ErrNotExist
}
return nil
}
func (sfs *sfs) DeleteFile(id string) error {
s := sfs.db.Rebind("DELETE FROM " + sfs.tn + " WHERE id = ?")
_, err := sfs.db.Exec(s, id)
return err
}
func (sfs *sfs) DeleteFiles(ids ...string) (int64, error) {
sql, args := sqx.In("id", ids)
return sfs.DeleteWhere(sql, args...)
}
func (sfs *sfs) DeletePrefix(prefix string) (int64, error) {
return sfs.DeleteWhere("id LIKE ?", sqx.StartsLike(prefix))
}
func (sfs *sfs) DeleteBefore(before time.Time) (int64, error) {
return sfs.DeleteWhere("time < ?", before)
}
func (sfs *sfs) DeletePrefixBefore(prefix string, before time.Time) (int64, error) {
return sfs.DeleteWhere("id LIKE ? AND time < ?", sqx.StartsLike(prefix), before)
}
func (sfs *sfs) DeleteWhere(where string, args ...any) (int64, error) {
s := sfs.db.Rebind("DELETE FROM " + sfs.tn + " WHERE " + where)
r, err := sfs.db.Exec(s, args...)
if err != nil {
return 0, err
}
return r.RowsAffected()
}
// DeleteAll use "DELETE FROM files" to delete all files
func (sfs *sfs) DeleteAll() (int64, error) {
r, err := sfs.db.Exec("DELETE FROM " + sfs.tn)
if err != nil {
return 0, err
}
return r.RowsAffected()
}
// Truncate use "TRUNCATE TABLE files" to truncate files
func (sfs *sfs) Truncate() error {
_, err := sfs.db.Exec("TRUNCATE TABLE " + sfs.tn)
return err
}