| 1 | package hostrpc |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "errors" |
| 6 | "testing" |
| 7 | ) |
| 8 | |
| 9 | var cancelWhileDecoding context.CancelFunc |
| 10 | |
| 11 | type cancelingArgument string |
| 12 | type requestContextKey struct{} |
| 13 | |
| 14 | func (*cancelingArgument) UnmarshalJSON([]byte) error { cancelWhileDecoding(); return nil } |
| 15 | |
| 16 | type cancellationTarget struct { |
| 17 | calls int |
| 18 | cancel context.CancelFunc |
| 19 | seen context.Context |
| 20 | } |
| 21 | |
| 22 | func (f *cancellationTarget) DecodeWrite(cancelingArgument) { f.calls++ } |
| 23 | func (f *cancellationTarget) Write() string { f.calls++; f.cancel(); return "committed" } |
| 24 | func (f *cancellationTarget) Cooperative(ctx context.Context, value string) (string, error) { |
| 25 | f.seen = ctx |
| 26 | f.calls++ |
| 27 | return value, nil |
| 28 | } |
| 29 | |
| 30 | func TestCancellationAfterDecodeDoesNotDispatch(t *testing.T) { |
| 31 | ctx, cancel := context.WithCancel(context.Background()) |
| 32 | defer cancel() |
| 33 | cancelWhileDecoding = cancel |
| 34 | t.Cleanup(func() { cancelWhileDecoding = nil }) |
| 35 | target := &cancellationTarget{} |
| 36 | _, err := mustRegistry(t, target, nil).Invoke(ctx, "DecodeWrite", raw(`"value"`)) |
| 37 | if !errors.Is(err, context.Canceled) || target.calls != 0 { |
| 38 | t.Fatalf("err=%v calls=%d", err, target.calls) |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | func TestDispatchedWriteKeepsSuccessAfterCancellation(t *testing.T) { |
| 43 | ctx, cancel := context.WithCancel(context.Background()) |
| 44 | defer cancel() |
| 45 | target := &cancellationTarget{cancel: cancel} |
| 46 | got, err := mustRegistry(t, target, nil).Invoke(ctx, "Write", nil) |
| 47 | if err != nil || got != "committed" || target.calls != 1 || ctx.Err() == nil { |
| 48 | t.Fatalf("result=%v err=%v calls=%d", got, err, target.calls) |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | func TestLeadingContextIsHostOnlyAndPassedToOwner(t *testing.T) { |
| 53 | target := &cancellationTarget{} |
| 54 | r := mustRegistry(t, target, nil) |
| 55 | ctx := context.WithValue(context.Background(), requestContextKey{}, "request") |
| 56 | got, err := r.Invoke(ctx, "Cooperative", raw(`"value"`)) |
| 57 | if err != nil || got != "value" || target.seen != ctx { |
| 58 | t.Fatalf("result=%v err=%v context=%v", got, err, target.seen) |
| 59 | } |
| 60 | for _, cmd := range r.Commands() { |
| 61 | if cmd.Name == "Cooperative" && (len(cmd.Params) != 1 || cmd.Params[0].Kind != KindString || cmd.Cancellation != "cooperative-context") { |
| 62 | t.Fatalf("wire command=%+v", cmd) |
| 63 | } |
| 64 | } |
| 65 | } |
| 66 |