(t *testing.T, nc *nats.Conn)
| 39 | } |
| 40 | |
| 41 | func testContextRequestWithTimeout(t *testing.T, nc *nats.Conn) { |
| 42 | nc.Subscribe("slow", func(m *nats.Msg) { |
| 43 | // Simulates latency into the client so that timeout is hit. |
| 44 | time.Sleep(200 * time.Millisecond) |
| 45 | nc.Publish(m.Reply, []byte("NG")) |
| 46 | }) |
| 47 | nc.Subscribe("fast", func(m *nats.Msg) { |
| 48 | nc.Publish(m.Reply, []byte("OK")) |
| 49 | }) |
| 50 | nc.Subscribe("hdrs", func(m *nats.Msg) { |
| 51 | if m.Header.Get("Hdr-Test") != "1" { |
| 52 | m.Respond([]byte("-ERR")) |
| 53 | } |
| 54 | |
| 55 | r := nats.NewMsg(m.Reply) |
| 56 | r.Header = m.Header |
| 57 | r.Data = []byte("+OK") |
| 58 | m.RespondMsg(r) |
| 59 | }) |
| 60 | |
| 61 | ctx, cancelCB := context.WithTimeout(context.Background(), 100*time.Millisecond) |
| 62 | defer cancelCB() // should always be called, not discarded, to prevent context leak |
| 63 | |
| 64 | // Fast request should not fail at this point. |
| 65 | resp, err := nc.RequestWithContext(ctx, "fast", []byte("")) |
| 66 | if err != nil { |
| 67 | t.Fatalf("Expected request with context to not fail on fast response: %s", err) |
| 68 | } |
| 69 | got := string(resp.Data) |
| 70 | expected := "OK" |
| 71 | if got != expected { |
| 72 | t.Errorf("Expected to receive %s, got: %s", expected, got) |
| 73 | } |
| 74 | |
| 75 | // Slow request hits timeout so expected to fail. |
| 76 | _, err = nc.RequestWithContext(ctx, "slow", []byte("world")) |
| 77 | if err == nil { |
| 78 | t.Fatal("Expected request with timeout context to fail") |
| 79 | } |
| 80 | |
| 81 | // Reported error is "context deadline exceeded" from Context package, |
| 82 | // which implements net.Error interface. |
| 83 | type timeoutError interface { |
| 84 | Timeout() bool |
| 85 | } |
| 86 | timeoutErr, ok := err.(timeoutError) |
| 87 | if !ok || !timeoutErr.Timeout() { |
| 88 | t.Error("Expected to have a timeout error") |
| 89 | } |
| 90 | expected = `context deadline exceeded` |
| 91 | if !strings.Contains(err.Error(), expected) { |
| 92 | t.Errorf("Expected %q error, got: %q", expected, err.Error()) |
| 93 | } |
| 94 | |
| 95 | // 2nd request should fail again even if they would be fast because context |
| 96 | // has already timed out. |
| 97 | _, err = nc.RequestWithContext(ctx, "fast", []byte("world")) |
| 98 | if err == nil { |
no test coverage detected