94 lines
2.5 KiB
Go
94 lines
2.5 KiB
Go
package bundb
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import (
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"context"
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"database/sql"
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"github.com/sirupsen/logrus"
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"github.com/superseriousbusiness/gotosocial/internal/db"
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"github.com/uptrace/bun"
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"github.com/uptrace/bun/dialect"
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)
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// DBConn wrapps a bun.DB conn to provide SQL-type specific additional functionality
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type DBConn struct {
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// TODO: move *Config here, no need to be in each struct type
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errProc func(error) db.Error // errProc is the SQL-type specific error processor
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log *logrus.Logger // log is the logger passed with this DBConn
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*bun.DB // DB is the underlying bun.DB connection
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}
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// WrapDBConn @TODO
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func WrapDBConn(dbConn *bun.DB, log *logrus.Logger) *DBConn {
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var errProc func(error) db.Error
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switch dbConn.Dialect().Name() {
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case dialect.PG:
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errProc = processPostgresError
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case dialect.SQLite:
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errProc = processSQLiteError
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default:
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panic("unknown dialect name: " + dbConn.Dialect().Name().String())
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}
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return &DBConn{
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errProc: errProc,
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log: log,
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DB: dbConn,
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}
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}
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// RunInTx wraps execution of the supplied transaction function.
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func (conn *DBConn) RunInTx(ctx context.Context, fn func(bun.Tx) error) db.Error {
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// Acquire a new transaction
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tx, err := conn.BeginTx(ctx, nil)
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if err != nil {
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return conn.ProcessError(err)
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}
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// Perform supplied transaction
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if err = fn(tx); err != nil {
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tx.Rollback() //nolint
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return conn.ProcessError(err)
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}
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// Finally, commit transaction
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err = tx.Commit()
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return conn.ProcessError(err)
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}
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// ProcessError processes an error to replace any known values with our own db.Error types,
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// making it easier to catch specific situations (e.g. no rows, already exists, etc)
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func (conn *DBConn) ProcessError(err error) db.Error {
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switch {
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case err == nil:
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return nil
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case err == sql.ErrNoRows:
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return db.ErrNoEntries
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default:
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return conn.errProc(err)
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}
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}
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// Exists checks the results of a SelectQuery for the existence of the data in question, masking ErrNoEntries errors
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func (conn *DBConn) Exists(ctx context.Context, query *bun.SelectQuery) (bool, db.Error) {
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// Get the select query result
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count, err := query.Count(ctx)
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// Process error as our own and check if it exists
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switch err := conn.ProcessError(err); err {
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case nil:
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return (count != 0), nil
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case db.ErrNoEntries:
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return false, nil
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default:
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return false, err
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}
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}
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// NotExists is the functional opposite of conn.Exists()
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func (conn *DBConn) NotExists(ctx context.Context, query *bun.SelectQuery) (bool, db.Error) {
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// Simply inverse of conn.exists()
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exists, err := conn.Exists(ctx, query)
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return !exists, err
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}
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