Blind-relay NPM

blind-relay

Blind relay for UDX over Protomux channels. By acting as a blind relay, a host may accept pairing requests from other hosts and relay UDX stream messages between them, similar to Traversal Using Relays around NAT (TURN).

npm i blind-relay

Protocol

sequenceDiagram
    actor a as peer a
    actor r as relay
    actor b as peer b

    par
        a ->> r: pair { isInitiator: true, token, id, seq }
    and
        b ->> r: pair { isInitiator: false, token, id, seq }
    end

    note over r: The relay pairs peers a and b based on the token, allocates a new stream for both peers, and sends back the stream info

    par
        r -->> a: pair { isInitiator: true, token, id, seq }
    and
        r -->> b: pair { isInitiator: false, token, id, seq }
    end

    par
        a ->> r: unpair { token }

        note left of r: The relay deallocates the stream previously allocated to peer a
    and
        b ->> r: unpair { token }

        note right of r: The relay deallocates the stream previously allocated to peer b
    end