improve cluster

lualib/cluster.lua

@@ -16,6 +16,10 @@ function cluster.open(port)
 	end
 end
 
+function cluster.reload()
+	skynet.call(clusterd, "lua", "reload")
+end
+
 skynet.init(function()
 	clusterd = skynet.uniqueservice("clusterd")
 end)

lualib/skynet.lua

@@ -325,6 +325,9 @@ end
 
 function skynet.rawcall(addr, typename, msg, sz)
 	local p = proto[typename]
+	if watching_service[addr] == false then
+		error("Service is dead")
+	end
 	local session = assert(c.send(addr, p.id , nil , msg, sz), "call to invalid address")
 	return yield_call(addr, session)
 end