1 files changed, 78 insertions, 0 deletions
diff --git a/src/go/collectors/go.d.plugin/modules/postgres/do_query.go b/src/go/collectors/go.d.plugin/modules/postgres/do_query.go
new file mode 100644
index 000000000..3b90be0d7
--- /dev/null
+++ b/src/go/collectors/go.d.plugin/modules/postgres/do_query.go
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package postgres
+
+import (
+	"context"
+	"database/sql"
+)
+
+func (p *Postgres) doQueryRow(query string, v any) error {
+	ctx, cancel := context.WithTimeout(context.Background(), p.Timeout.Duration())
+	defer cancel()
+
+	return p.db.QueryRowContext(ctx, query).Scan(v)
+}
+
+func (p *Postgres) doDBQueryRow(db *sql.DB, query string, v any) error {
+	ctx, cancel := context.WithTimeout(context.Background(), p.Timeout.Duration())
+	defer cancel()
+
+	return db.QueryRowContext(ctx, query).Scan(v)
+}
+
+func (p *Postgres) doQuery(query string, assign func(column, value string, rowEnd bool)) error {
+	return p.doDBQuery(p.db, query, assign)
+}
+
+func (p *Postgres) doDBQuery(db *sql.DB, query string, assign func(column, value string, rowEnd bool)) error {
+	ctx, cancel := context.WithTimeout(context.Background(), p.Timeout.Duration())
+	defer cancel()
+
+	rows, err := db.QueryContext(ctx, query)
+	if err != nil {
+		return err
+	}
+	defer func() { _ = rows.Close() }()
+
+	return readRows(rows, assign)
+}
+
+func readRows(rows *sql.Rows, assign func(column, value string, rowEnd bool)) error {
+	if assign == nil {
+		return nil
+	}
+
+	columns, err := rows.Columns()
+	if err != nil {
+		return err
+	}
+
+	values := makeValues(len(columns))
+
+	for rows.Next() {
+		if err := rows.Scan(values...); err != nil {
+			return err
+		}
+		for i, l := 0, len(values); i < l; i++ {
+			assign(columns[i], valueToString(values[i]), i == l-1)
+		}
+	}
+	return rows.Err()
+}
+
+func valueToString(value any) string {
+	v, ok := value.(*sql.NullString)
+	if !ok || !v.Valid {
+		return ""
+	}
+	return v.String
+}
+
+func makeValues(size int) []any {
+	vs := make([]any, size)
+	for i := range vs {
+		vs[i] = &sql.NullString{}
+	}
+	return vs
+}