74 lines
1.4 KiB
Go
74 lines
1.4 KiB
Go
package currency
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import (
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"context"
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"database/sql"
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)
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type DB struct {
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db *sql.DB
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}
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func NewCurrencyDB(sqlDb *sql.DB) *DB {
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return &DB{
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db: sqlDb,
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}
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}
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func getCachedFormatsFromDBRows(rows *sql.Rows) (FormatPerSymbol, error) {
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formats := make(FormatPerSymbol)
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for rows.Next() {
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var format Format
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if err := rows.Scan(&format.Symbol, &format.DisplayDecimals, &format.StripTrailingZeroes); err != nil {
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return nil, err
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}
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formats[format.Symbol] = format
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}
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return formats, nil
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}
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func (cdb *DB) GetCachedFormats() (FormatPerSymbol, error) {
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rows, err := cdb.db.Query("SELECT symbol, display_decimals, strip_trailing_zeroes FROM currency_format_cache")
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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return getCachedFormatsFromDBRows(rows)
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}
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func (cdb *DB) UpdateCachedFormats(formats FormatPerSymbol) error {
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tx, err := cdb.db.BeginTx(context.Background(), &sql.TxOptions{})
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if err != nil {
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return err
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}
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defer func() {
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if err == nil {
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err = tx.Commit()
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return
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}
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// don't shadow original error
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_ = tx.Rollback()
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}()
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insert, err := tx.Prepare(`INSERT OR REPLACE INTO currency_format_cache
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(symbol, display_decimals, strip_trailing_zeroes)
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VALUES
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(?, ?, ?)`)
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if err != nil {
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return err
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}
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for _, format := range formats {
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_, err = insert.Exec(format.Symbol, format.DisplayDecimals, format.StripTrailingZeroes)
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if err != nil {
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return err
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}
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}
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return nil
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}
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