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// SPDX-FileCopyrightText: 2026 Stefan Majewsky <majewsky@gmx.net>
// SPDX-License-Identifier: Apache-2.0
package oblast_pgx
import (
"context"
"fmt"
"strconv"
"sync/atomic"
"github.com/jackc/pgx/v5"
"github.com/jackc/pgx/v5/pgconn"
"go.xyrillian.de/oblast/handle"
)
type Handle interface {
Exec(ctx context.Context, sql string, args ...any) (pgconn.CommandTag, error)
Query(ctx context.Context, sql string, args ...any) (pgx.Rows, error)
QueryRow(ctx context.Context, sql string, args ...any) pgx.Row
}
var (
_ Handle = &pgx.Conn{}
_ Handle = pgx.Tx(nil)
)
// TODO: offer wrapping for pgxpool.Pool and pgxpool.Conn?
func Wrap(h Handle) handle.Handle {
switch h := h.(type) {
case *pgx.Conn:
return wrappedHandle{h}
case pgx.Tx:
return wrappedHandle{h}
default:
panic(fmt.Sprintf("unexpected type: %#v", h))
}
}
var preparedStatementId atomic.Uint64
type wrappedHandle struct {
inner Handle
}
// OblastPrepare implements the [handle.Handle] interface.
func (h wrappedHandle) OblastPrepare(ctx context.Context, query string, repeated bool) (handle.Statement, error) {
if !repeated {
return wrappedUnpreparedStatement{query, h.inner}, nil
}
name := "oblast_pgx_" + strconv.FormatUint(preparedStatementId.Add(1), 10)
switch inner := h.inner.(type) {
case *pgx.Conn:
stmt, err := inner.Prepare(ctx, name, query)
return wrappedPreparedStatement{ctx, stmt, h.inner}, err
case pgx.Tx:
stmt, err := inner.Conn().Prepare(ctx, name, query)
return wrappedPreparedStatement{ctx, stmt, h.inner}, err
default:
panic("unreachable") // because of the check in func Wrap()
}
}
// Releases a prepared statement.
func deallocate(ctx context.Context, h Handle, stmt *pgconn.StatementDescription) error {
switch h := h.(type) {
case *pgx.Conn:
return h.Deallocate(ctx, stmt.Name)
case pgx.Tx:
return h.Conn().Deallocate(ctx, stmt.Name)
default:
panic("unreachable") // because of the check in func Wrap()
}
}
// OblastQuery implements the [handle.Handle] interface.
func (h wrappedHandle) OblastQuery(ctx context.Context, query string, args []any) (handle.Rows, error) {
rows, err := h.inner.Query(ctx, query, args...)
return wrappedRows{rows}, err
}
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