basichost: initial commit for protocol id compress

Author: ppopth

p2p/host/basic/basic_host.go

@@ -477,6 +477,10 @@ func (h *BasicHost) NewStream(ctx context.Context, p peer.ID, pids ...protocol.I
 		return nil, err
 	}
 
+	if h.supportProtocolAbbreviation(p) {
+		// TODO: if the protocol ID abbreviation is supported, do something here.
+	}
+
 	if pref != "" {
 		if err := s.SetProtocol(pref); err != nil {
 			return nil, err
@@ -528,6 +532,17 @@ func (h *BasicHost) preferredProtocol(p peer.ID, pids []protocol.ID) (protocol.I
 	return out, nil
 }
 
+func (h *BasicHost) supportProtocolAbbreviation(p peer.ID) bool {
+	mv, err := h.Peerstore().Get(p, "MaxMultiselectVersion")
+	if err != nil {
+		// if there is no value, assume it's not supported.
+		return false
+	}
+	// TODO: Check the version with go-multistream
+	_ = mv
+	return false
+}
+
 // Connect ensures there is a connection between this host and the peer with
 // given peer.ID. If there is not an active connection, Connect will issue a
 // h.Network.Dial, and block until a connection is open, or an error is returned.