112 lines
2.5 KiB
Go
112 lines
2.5 KiB
Go
package service
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import (
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"database/sql"
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"fmt"
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"os"
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"path/filepath"
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_ "github.com/mattn/go-sqlite3"
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)
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type MacAddress struct {
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Id string
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Prefix string
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VendorName string
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Private bool
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BlockType string
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LastUpdate string
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}
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type SQLiteHelper struct {
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db *sql.DB
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}
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// create the instance of SQLiteHelper but not initialize the database connection
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func NewSQLiteHelper() *SQLiteHelper {
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return &SQLiteHelper{
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db: nil,
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}
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}
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// check if the directory and file for the database exist
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func (helper *SQLiteHelper) CheckBeforeInit() bool {
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userHomeDir, _ := os.UserHomeDir()
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dbFileDir := filepath.Join(userHomeDir, ".macfastlookup")
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dbFileName := "mac_vendors.sqlite3"
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dbFilePath := filepath.Join(dbFileDir, dbFileName)
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if _, err := os.Stat(dbFileDir); os.IsNotExist(err) {
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os.Mkdir(dbFileDir, 0755)
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}
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if _, err := os.Stat(dbFilePath); os.IsNotExist(err) {
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return false
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}
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return true
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}
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// initialize the database connection
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func (helper *SQLiteHelper) InitSQLiteHelper() bool {
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dbFileDir := ".macfastlookup"
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userHomeDir, _ := os.UserHomeDir()
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dbFileName := "mac_vendors.sqlite3"
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dbFilePath := filepath.Join(userHomeDir, dbFileDir, dbFileName)
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connectionString := fmt.Sprintf("file:%s?cache=shared&mode=rwc", dbFilePath)
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db, err := sql.Open("sqlite3", connectionString)
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if err != nil {
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return false
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}
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helper.db = db
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return true
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}
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func (helper *SQLiteHelper) Close() {
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if helper.db == nil {
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return
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}
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helper.db.Close()
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}
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func (helper *SQLiteHelper) ReloadDatabase() bool {
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return helper.InitSQLiteHelper()
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}
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func (helper *SQLiteHelper) QueryMacAddressByPrefix(prefix string) (*MacAddress, error) {
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const tableName = "MacAddresses"
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query := fmt.Sprintf("SELECT * FROM %s WHERE Prefix = ?", tableName)
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row := helper.db.QueryRow(query, prefix)
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var macAddress MacAddress
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err := row.Scan(&macAddress.Id, &macAddress.Prefix, &macAddress.VendorName, &macAddress.Private, &macAddress.BlockType, &macAddress.LastUpdate)
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if err != nil {
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if err == sql.ErrNoRows {
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return nil, nil
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}
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return nil, err
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}
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return &macAddress, nil
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}
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func (helper *SQLiteHelper) querySingleColumn(tableName, columnName string) (string, error) {
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query := fmt.Sprintf("SELECT %s FROM %s LIMIT 1", columnName, tableName)
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row := helper.db.QueryRow(query)
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var result string
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err := row.Scan(&result)
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if err != nil {
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return "", err
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}
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return result, nil
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}
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func (helper *SQLiteHelper) QueryVersion() (string, error) {
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return helper.querySingleColumn("Config", "Version")
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}
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