1  //// Transport abstractions.
 2  
 3  /// Supported transport families.
 4  pub type Transport {
 5    WebSocket
 6    ServerSentEvents
 7    LongPolling
 8    InProcess
 9  }
10  
11  /// Return a stable transport label.
12  pub fn label(transport: Transport) -> String {
13    case transport {
14      WebSocket -> "websocket"
15      ServerSentEvents -> "sse"
16      LongPolling -> "long_polling"
17      InProcess -> "in_process"
18    }
19  }
20  
21  /// True when the transport can send client and server messages over one channel.
22  pub fn bidirectional(transport: Transport) -> Bool {
23    case transport {
24      WebSocket -> True
25      InProcess -> True
26      ServerSentEvents -> False
27      LongPolling -> False
28    }
29  }