| 1 | package serve |
| 2 | |
| 3 | import ( |
| 4 | "encoding/json" |
| 5 | "strings" |
| 6 | "testing" |
| 7 | |
| 8 | "reasonix/internal/event" |
| 9 | "reasonix/internal/eventwire" |
| 10 | ) |
| 11 | |
| 12 | func TestBroadcasterFanOut(t *testing.T) { |
| 13 | b := NewBroadcaster() |
| 14 | a, ca := b.Subscribe() |
| 15 | d, cd := b.Subscribe() |
| 16 | defer ca() |
| 17 | defer cd() |
| 18 | |
| 19 | if got := b.Subscribers(); got != 2 { |
| 20 | t.Fatalf("subscribers = %d, want 2", got) |
| 21 | } |
| 22 | |
| 23 | b.Emit(event.Event{Kind: event.Text, Text: "hi"}) |
| 24 | |
| 25 | for i, ch := range []<-chan []byte{a, d} { |
| 26 | var w eventwire.Event |
| 27 | if err := json.Unmarshal(<-ch, &w); err != nil { |
| 28 | t.Fatalf("subscriber %d: %v", i, err) |
| 29 | } |
| 30 | if w.Kind != "text" || w.Text != "hi" { |
| 31 | t.Errorf("subscriber %d got %+v", i, w) |
| 32 | } |
| 33 | } |
| 34 | } |
| 35 | |
| 36 | func TestBroadcasterEmitsRetryingJSON(t *testing.T) { |
| 37 | b := NewBroadcaster() |
| 38 | ch, cancel := b.Subscribe() |
| 39 | defer cancel() |
| 40 | |
| 41 | b.Emit(event.Event{Kind: event.Retrying, RetryAttempt: 3, RetryMax: 10}) |
| 42 | |
| 43 | s := string(<-ch) |
| 44 | for _, want := range []string{`"kind":"retrying"`, `"retryAttempt":3`, `"retryMax":10`} { |
| 45 | if !strings.Contains(s, want) { |
| 46 | t.Fatalf("retrying broadcast JSON = %s, want it to contain %s", s, want) |
| 47 | } |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | func TestBroadcasterUnsubscribe(t *testing.T) { |
| 52 | b := NewBroadcaster() |
| 53 | _, cancel := b.Subscribe() |
| 54 | if b.Subscribers() != 1 { |
| 55 | t.Fatalf("want 1 subscriber") |
| 56 | } |
| 57 | cancel() |
| 58 | if b.Subscribers() != 0 { |
| 59 | t.Fatalf("unsubscribe should drop to 0, got %d", b.Subscribers()) |
| 60 | } |
| 61 | // Emitting with no subscribers must not panic. |
| 62 | b.Emit(event.Event{Kind: event.TurnDone}) |
| 63 | } |
| 64 | |
| 65 | func TestBroadcasterDropsSlowSubscriber(t *testing.T) { |
| 66 | b := NewBroadcaster() |
| 67 | ch, cancel := b.Subscribe() |
| 68 | defer cancel() |
| 69 | // Overfill far past the 64-slot buffer without reading; Emit must not block. |
| 70 | for i := 0; i < 1000; i++ { |
| 71 | b.Emit(event.Event{Kind: event.Text, Text: "x"}) |
| 72 | } |
| 73 | if len(ch) == 0 { |
| 74 | t.Error("expected some buffered frames") |
| 75 | } |
| 76 | } |
| 77 |