feat: add a transports section for enabling/disabling/prioritizing transports

swarm.go

 package config
 
 type SwarmConfig struct {
-	AddrFilters             []string
+	// AddrFilters specifies a set libp2p addresses that we should never
+	// dial or receive connections from.
+	AddrFilters []string
+
+	// DisableBandwidthMetrics disables recording of bandwidth metrics for a
+	// slight reduction in memory usage. You probably don't need to set this
+	// flag.
 	DisableBandwidthMetrics bool
-	DisableNatPortMap       bool
-	DisableRelay            bool
-	EnableRelayHop          bool
 
-	// autorelay functionality
-	// if true, then the libp2p host will be constructed with autorelay functionality.
+	// DisableNatPortMap turns off NAT port mapping (UPnP, etc.).
+	DisableNatPortMap bool
+
+	// DisableRelay explicitly disables the relay transport.
+	//
+	// Deprecated: This flag is deprecated and is overridden by
+	// `Transports.Relay` if specified.
+	DisableRelay bool `json:",omitempty"`
+
+	// EnableRelayHop makes this node act as a public relay, relaying
+	// traffic between other nodes.
+	EnableRelayHop bool
+
+	// EnableAutoRelay enables the "auto relay" feature.
+	//
+	// When both EnableAutoRelay and RelayHop are set, this go-ipfs node
+	// will advertise itself as a public relay, instead of finding and using
+	// advertised public relays.
 	EnableAutoRelay bool
 
+	// Transports contains flags to enable/disable libp2p transports.
+	Transports Transports
+
+	// ConnMgr configures the connection manager.
 	ConnMgr ConnMgr
 }
 
+type Transports struct {
+	// Network specifies the base transports we'll use for dialing. To
+	// listen on a transport, add the transport to your Addresses.Swarm.
+	Network struct {
+		// All default to on.
+		QUIC      Flag `json:",omitempty"`
+		TCP       Flag `json:",omitempty"`
+		Websocket Flag `json:",omitempty"`
+		Relay     Flag `json:",omitempty"`
+	}
+
+	// Security specifies the transports used to encrypt insecure network
+	// transports.
+	Security struct {
+		// Defaults to 100.
+		TLS Priority `json:",omitempty"`
+		// Defaults to 200.
+		SECIO Priority `json:",omitempty"`
+		// Defaults to 300.
+		Noise Priority `json:",omitempty"`
+	}
+
+	// Multiplexers specifies the transports used to multiplex multiple
+	// connections over a single duplex connection.
+	Multiplex struct {
+		// Defaults to 100.
+		Yamux Priority `json:",omitempty"`
+		// Defaults to 200.
+		Mplex Priority `json:",omitempty"`
+	}
+}
+
 // ConnMgr defines configuration options for the libp2p connection manager
 type ConnMgr struct {
 	Type        string