后端初步完成

2021-05-21 01:00:58 +08:00
commit 84a7206c08
6 changed files with 722 additions and 0 deletions
--- a/internal/pkg/database/database.go
+++ b/internal/pkg/database/database.go
@@ -0,0 +1,349 @@
+package database
+
+import (
+	"database/sql"
+	"errors"
+	"log"
+	"os"
+	"path/filepath"
+
+	_ "github.com/mattn/go-sqlite3"
+)
+
+var initFilesTableQuery = `CREATE TABLE IF NOT EXISTS files (
+	id INTEGER PRIMARY KEY,
+	folder_id INTEGER NOT NULL,
+	filename TEXT NOT NULL
+);`
+var initFoldersTableQuery = `CREATE TABLE IF NOT EXISTS folders (
+	id INTEGER PRIMARY KEY,
+	folder TEXT NOT NULL,
+	foldername TEXT NOT NULL
+);`
+var insertFolderQuery = `INSERT INTO folders (folder, foldername) VALUES (?, ?);`
+var findFolderQuery = `SELECT id FROM folders WHERE folder = ? LIMIT 1;`
+var insertFileQuery = `INSERT INTO files (folder_id, filename) VALUES (?, ?);`
+var searchFilesQuery = `SELECT files.id, files.folder_id, files.filename, folders.foldername FROM files JOIN folders ON files.folder_id = folders.id WHERE filename LIKE ? LIMIT ? OFFSET ?;`
+var getFolderQuery = `SELECT folder FROM folders WHERE id = ? LIMIT 1;`
+var dropFilesQuery = `DROP TABLE files;`
+var dropFolderQuery = `DROP TABLE folders;`
+var getFileQuery = `SELECT files.id, files.folder_id, files.filename, folders.foldername FROM files JOIN folders ON files.folder_id = folders.id WHERE files.id = ? LIMIT 1;`
+var searchFoldersQuery = `SELECT id, folder, foldername FROM folders WHERE foldername LIKE ? LIMIT ? OFFSET ?;`
+
+type Database struct {
+	sqlConn *sql.DB
+	stmt *Stmt
+}
+
+type Stmt struct {
+	initFilesTable *sql.Stmt
+	initFoldersTable *sql.Stmt
+	insertFolder *sql.Stmt
+	insertFile *sql.Stmt
+	findFolder *sql.Stmt
+	searchFiles *sql.Stmt
+	getFolder *sql.Stmt
+	dropFiles *sql.Stmt
+	dropFolder *sql.Stmt
+	getFile *sql.Stmt
+	searchFolders *sql.Stmt
+}
+
+type File struct {
+	Db *Database `json:"-"`
+	ID int64 `json:"id"`
+	Folder_id int64 `json:"folder_id"`
+	Foldername string `json:"foldername"`
+	Filename string `json:"filename"`
+}
+
+type Folder struct {
+	Db *Database `json:"-"`
+	ID int64 `json:"id"`
+	Folder string `json:"folder"`
+	Foldername string `json:"foldername"`
+}
+
+func (database *Database) SearchFolders(foldername string, limit int64, offset int64) ([]Folder, error) {
+	rows, err := database.stmt.searchFolders.Query("%"+foldername+"%", limit, offset)
+	if err != nil {
+		return nil, errors.New("Error searching folders at query " + err.Error())
+	}
+	defer rows.Close()
+	folders := make([]Folder, 0)
+	for rows.Next() {
+		folder := Folder{
+			Db: database,
+		}
+		err = rows.Scan(&folder.ID, &folder.Folder, &folder.Foldername)
+		if err != nil {
+			return nil, errors.New("Error scanning SearchFolders" + err.Error())
+		}
+		folders = append(folders, folder)
+	}
+	return folders, nil
+}
+
+func (database *Database) GetFile(id int64) (*File, error) {
+	file := &File{
+		Db: database,
+	}
+	err := database.stmt.getFile.QueryRow(id).Scan(&file.ID, &file.Folder_id, &file.Filename, &file.Foldername)
+	if err != nil {
+		return nil, err
+	}
+	return file, nil
+}
+
+func (database *Database) ResetFiles() (error) {
+	var err error
+	_, err = database.stmt.dropFiles.Exec()
+	if err != nil {
+		return err
+	}
+	_, err = database.stmt.initFilesTable.Exec()
+	if err != nil {
+		return err
+	}
+	return err
+}
+
+func (database *Database) ResetFolder() (error) {
+	var err error
+	_, err = database.stmt.dropFolder.Exec()
+	if err != nil {
+		return err
+	}
+	_, err = database.stmt.initFoldersTable.Exec()
+	if err != nil {
+		return err
+	}
+	return err
+}
+
+func (database *Database) Walk(root string, pattern []string) (error) {
+	patternDict := make(map[string]bool)
+	for _, v := range pattern {
+		patternDict[v] = true
+	}
+	log.Println(patternDict)
+	return filepath.Walk(root, func (path string, info os.FileInfo, err error) (error) {
+		if err != nil {
+			return err
+		}
+
+		if info.IsDir() {
+			return nil
+		}
+
+		// check pattern
+		ext := filepath.Ext(info.Name())
+		if _, ok := patternDict[ext]; !ok {
+			log.Println("False", ext, info.Name())
+			return nil
+		}
+		log.Println("True", ext, info.Name())
+
+		// insert file, folder will aut created
+		err = database.Insert(path)
+		if err != nil {
+			return err
+		}
+		return nil
+	})
+}
+
+func (f *File) Path() (string, error) {
+	folder, err := f.Db.GetFolder(f.Folder_id)
+	if err != nil {
+		return "", err
+	}
+	return filepath.Join(folder.Folder, f.Filename), nil
+}
+
+func (database *Database) GetFolder(folderId int64) (*Folder, error) {
+	folder := &Folder{
+		Db: database,
+	}
+	err := database.stmt.getFolder.QueryRow(folderId).Scan(&folder.Folder)
+	if err != nil {
+		return nil, err
+	}
+	return folder, nil
+}
+
+func (database *Database) SearchFiles(filename string, limit int64, offset int64) ([]File, error) {
+	rows, err := database.stmt.searchFiles.Query("%"+filename+"%", limit, offset)
+	if err != nil {
+		return nil, errors.New("Error searching files at query " + err.Error())
+	}
+	defer rows.Close()
+	files := make([]File, 0)
+	for rows.Next() {
+		var file File = File{
+			Db: database,
+		}
+		err = rows.Scan(&file.ID, &file.Folder_id, &file.Filename, &file.Foldername)
+		if err != nil {
+			return nil, errors.New("Error scanning SearchFiles " + err.Error())
+		}
+		files = append(files, file)
+	}
+	if err = rows.Err(); err != nil {
+		return nil, errors.New("Error scanning SearchFiles exit without full result" + err.Error())
+	}
+	return files, nil
+}
+
+func (database *Database) FindFolder(folder string) (int64, error) {
+	var id int64
+	err := database.stmt.findFolder.QueryRow(folder).Scan(&id)
+	if err != nil {
+		return 0, err
+	}
+	return id, nil
+}
+
+func (database *Database) InsertFolder(folder string) (int64, error) {
+	result, err := database.stmt.insertFolder.Exec(folder, filepath.Base(folder))
+	if err != nil {
+		return 0, err
+	}
+	lastInsertId, err := result.LastInsertId()
+	if err != nil {
+		return 0, err
+	}
+	return lastInsertId, nil
+}
+
+func (database *Database) InsertFile(folderId int64, filename string) (error) {
+	_, err := database.stmt.insertFile.Exec(folderId, filename)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (database *Database) Insert(path string) (error) {
+	folder, filename := filepath.Split(path)
+	folderId, err := database.FindFolder(folder)
+	if err != nil {
+		folderId, err = database.InsertFolder(folder)
+		if err != nil {
+			return err
+		}
+	}
+	err = database.InsertFile(folderId, filename)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func NewPreparedStatement(sqlConn *sql.DB) (*Stmt, error) {
+	var err error
+
+	stmt := &Stmt{}
+
+	// init files table
+	stmt.initFilesTable, err = sqlConn.Prepare(initFilesTableQuery)
+	if err != nil {
+		return nil, err
+	}
+
+	// init folders table
+	stmt.initFoldersTable, err = sqlConn.Prepare(initFoldersTableQuery)
+	if err != nil {
+		return nil, err
+	}
+
+	// run init statement
+	_, err = stmt.initFilesTable.Exec()
+	if err != nil {
+		return nil, err
+	}
+	_, err = stmt.initFoldersTable.Exec()
+	if err != nil {
+		return nil, err
+	}
+
+	// init insert folder statement
+	stmt.insertFolder, err = sqlConn.Prepare(insertFolderQuery)
+	if err != nil {
+		return nil, err
+	}
+
+	// init findFolder statement
+	stmt.findFolder, err = sqlConn.Prepare(findFolderQuery)
+	if err != nil {
+		return nil, err
+	}
+
+	// init insertFile stmt
+	stmt.insertFile, err = sqlConn.Prepare(insertFileQuery)
+	if err != nil {
+		return nil, err
+	}
+
+	// init searchFile stmt
+	stmt.searchFiles, err = sqlConn.Prepare(searchFilesQuery)
+	if err != nil {
+		return nil, err
+	}
+
+	// init getFolder stmt
+	stmt.getFolder, err = sqlConn.Prepare(getFolderQuery)
+	if err != nil {
+		return nil, err
+	}
+
+	// init dropFolder stmt
+	stmt.dropFolder, err = sqlConn.Prepare(dropFolderQuery)
+	if err != nil {
+		return nil, err
+	}
+
+	// init dropFiles stmt
+	stmt.dropFiles, err = sqlConn.Prepare(dropFilesQuery)
+	if err != nil {
+		return nil, err
+	}
+
+	// init getFile stmt
+	stmt.getFile, err = sqlConn.Prepare(getFileQuery)
+	if err != nil {
+		return nil, err
+	}
+
+	// init searchFolder stmt
+	stmt.searchFolders, err = sqlConn.Prepare(searchFoldersQuery)
+	if err != nil {
+		return nil, err
+	}
+
+	return stmt, err
+}
+
+func NewDatabase(dbName string) (*Database, error) {
+	var err error
+
+	// open database
+	sqlConn, err := sql.Open("sqlite3", dbName)
+	if err != nil {
+		return nil, err
+	}
+
+	// prepare statement
+	stmt, err := NewPreparedStatement(sqlConn)
+	if err != nil {
+		return nil, err
+	}
+
+	// new database
+	database := &Database{
+		sqlConn: sqlConn,
+		stmt: stmt,
+	}
+
+	return database, nil
+}