| 345 | } |
| 346 | |
| 347 | func wrapVmRun(ctx context.Context, vm *VM, fn func() (otto.Value, error)) (value *Value, e error) { |
| 348 | defer func() { |
| 349 | if r := recover(); r != nil { |
| 350 | if ee, ok := r.(error); ok { |
| 351 | e = ee |
| 352 | return |
| 353 | } |
| 354 | e = fmt.Errorf("%s", r) |
| 355 | } |
| 356 | |
| 357 | e = mapError(e) |
| 358 | }() |
| 359 | |
| 360 | // Drain any interrupt left over from a previous run. The interrupt sender |
| 361 | // below can lose a race with fn() finishing, leaving a stale interrupt in |
| 362 | // the buffered channel. Since a VM is never run concurrently, it is safe to |
| 363 | // clear it here before running, preventing an unrelated request (this VM is |
| 364 | // reused from a pool) from being wrongly interrupted. |
| 365 | select { |
| 366 | case <-vm.o.Interrupt: |
| 367 | default: |
| 368 | } |
| 369 | |
| 370 | finished := make(chan struct{}) |
| 371 | go func() { |
| 372 | select { |
| 373 | case <-ctx.Done(): |
| 374 | // If fn() already finished, prefer that branch so we don't leave a |
| 375 | // stale interrupt behind. |
| 376 | select { |
| 377 | case vm.o.Interrupt <- func() { panic(ctx.Err()) }: |
| 378 | case <-finished: |
| 379 | } |
| 380 | case <-finished: |
| 381 | } |
| 382 | }() |
| 383 | var ottoValue otto.Value |
| 384 | defer close(finished) |
| 385 | ottoValue, e = fn() |
| 386 | value = newValue(vm, ottoValue) |
| 387 | return |
| 388 | } |
| 389 | |
| 390 | func mapError(e error) error { |
| 391 | if e == nil { |