Run frontend and backend in a separate process

This will in the future allow the server to be restarted without closing open connections

common/connection.go

@@ -0,0 +1,49 @@
+package common
+
+import (
+	"net/rpc"
+	"wwfc/logging"
+)
+
+var rpcFrontend *rpc.Client
+
+type RPCFrontendPacket struct {
+	Server string
+	Index  uint64
+	Data   []byte
+}
+
+// ConnectFrontend connects to the frontend RPC server
+func ConnectFrontend() {
+	var err error
+	rpcFrontend, err = rpc.Dial("tcp", "localhost:29998")
+	if err != nil {
+		logging.Error("BACKEND", "Failed to connect to frontend:", err)
+	}
+}
+
+// SendPacket is used by backend servers to send a packet to a connection
+func SendPacket(server string, index uint64, data []byte) error {
+	if rpcFrontend == nil {
+		ConnectFrontend()
+	}
+
+	err := rpcFrontend.Call("RPCFrontendPacket.SendPacket", RPCFrontendPacket{Server: server, Index: index, Data: data}, nil)
+	if err != nil {
+		logging.Error("COMMON", "Failed to send packet to frontend:", err)
+	}
+	return err
+}
+
+// CloseConnection is used by backend servers to close a connection
+func CloseConnection(server string, index uint64) error {
+	if rpcFrontend == nil {
+		ConnectFrontend()
+	}
+
+	err := rpcFrontend.Call("RPCFrontendPacket.CloseConnection", RPCFrontendPacket{Server: server, Index: index}, nil)
+	if err != nil {
+		logging.Error("COMMON", "Failed to close connection:", err)
+	}
+	return err
+}