Tests that already constructed services can be retrieves by later ones.
(t *testing.T)
| 49 | |
| 50 | // Tests that already constructed services can be retrieves by later ones. |
| 51 | func TestContextServices(t *testing.T) { |
| 52 | stack, err := New(testNodeConfig()) |
| 53 | if err != nil { |
| 54 | t.Fatalf("failed to create protocol stack: %v", err) |
| 55 | } |
| 56 | // Define a verifier that ensures a NoopA is before it and NoopB after |
| 57 | verifier := func(ctx *ServiceContext) (Service, error) { |
| 58 | var objA *NoopServiceA |
| 59 | if ctx.Service(&objA) != nil { |
| 60 | return nil, fmt.Errorf("former service not found") |
| 61 | } |
| 62 | var objB *NoopServiceB |
| 63 | if err := ctx.Service(&objB); err != ErrServiceUnknown { |
| 64 | return nil, fmt.Errorf("latters lookup error mismatch: have %v, want %v", err, ErrServiceUnknown) |
| 65 | } |
| 66 | return new(NoopService), nil |
| 67 | } |
| 68 | // Register the collection of services |
| 69 | if err := stack.Register(NewNoopServiceA); err != nil { |
| 70 | t.Fatalf("former failed to register service: %v", err) |
| 71 | } |
| 72 | if err := stack.Register(verifier); err != nil { |
| 73 | t.Fatalf("failed to register service verifier: %v", err) |
| 74 | } |
| 75 | if err := stack.Register(NewNoopServiceB); err != nil { |
| 76 | t.Fatalf("latter failed to register service: %v", err) |
| 77 | } |
| 78 | // Start the protocol stack and ensure services are constructed in order |
| 79 | if err := stack.Start(); err != nil { |
| 80 | t.Fatalf("failed to start stack: %v", err) |
| 81 | } |
| 82 | defer stack.Stop() |
| 83 | } |