Client

In the normal we register methods as services'methods. Methods must follow the below rules:

• exported method of exported type
• three arguments, the first is of context.Context, both of exported type for three arguments
• the third argument is a pointer

• one return value, of type error
  And rpcx can also register raw functions as services and functions must follow the below rules:

• three arguments, the first is of context.Context, both of exported type for three arguments
• the third argument is a pointer
• one return value, of type error
  There is an example.

Server must use to register a function and provides a service name.

```go server.gotype Args struct { A int B int}

func mul(ctx context.Context, args _Args, reply _Reply) error { reply.C = args.A * args.B return nil}

func main() { flag.Parse()

Client use the service name and function name to access:
```go client.go
    d := client.NewPeer2PeerDiscovery("tcp@"+*addr, "")
    xclient := client.NewXClient("a.fake.service", client.Failtry, client.RandomSelect, d, client.DefaultOption)
    args := &example.Args{
        B: 20,
    }
    err := xclient.Call(context.Background(), "mul", args, reply)
    if err != nil {
        log.Fatalf("failed to call: %v", err)
    }
    log.Printf("%d * %d = %d", args.A, args.B, reply.C)

By smallnest updated 2018-12-04 11:47:26