Function TestContextCancelExec

driver_test.go:2691–2735

(t *testing.T)

}

func TestContextCancelExec(t *testing.T) {
	runTestsParallel(t, dsn, func(dbt *DBTest, tbl string) {
		dbt.mustExec("CREATE TABLE " + tbl + " (v INTEGER)")
		ctx, cancel := context.WithCancel(context.Background())

		// Delay execution for just a bit until db.ExecContext has begun.
		defer time.AfterFunc(250*time.Millisecond, cancel).Stop()

		// This query will be canceled.
		startTime := time.Now()
		if _, err := dbt.db.ExecContext(ctx, "INSERT INTO "+tbl+" VALUES (SLEEP(1))"); err != context.Canceled {
			dbt.Errorf("expected context.Canceled, got %v", err)
		}
		if d := time.Since(startTime); d > 500*time.Millisecond {
			dbt.Errorf("too long execution time: %s", d)
		}

		// Wait for the INSERT query to be done.
		time.Sleep(time.Second)

		// Check how many times the query is executed.
		var v int
		if err := dbt.db.QueryRow("SELECT COUNT(*) FROM " + tbl).Scan(&v); err != nil {
			dbt.Fatalf("%s", err.Error())
		}
		if v != 1 { // TODO: need to kill the query, and v should be 0.
			dbt.Skipf("[WARN] expected val to be 1, got %d", v)
		}

		// Context is already canceled, so error should come before execution.
		if _, err := dbt.db.ExecContext(ctx, "INSERT INTO "+tbl+" VALUES (1)"); err == nil {
			dbt.Error("expected error")
		} else if err.Error() != "context canceled" {
			dbt.Fatalf("unexpected error: %s", err)
		}

		// The second insert query will fail, so the table has no changes.
		if err := dbt.db.QueryRow("SELECT COUNT(*) FROM " + tbl).Scan(&v); err != nil {
			dbt.Fatalf("%s", err.Error())
		}
		if v != 1 {
			dbt.Skipf("[WARN] expected val to be 1, got %d", v)
		}
	})
}

func TestContextCancelQuery(t *testing.T) {
	runTestsParallel(t, dsn, func(dbt *DBTest, tbl string) {