Propagate electricity transfers across servers

module/edge/power_link.lua

@@ -59,6 +59,44 @@ local function poll_links(id, edge, ticks_left)
 		end
 		::continue::
 	end
+
+    -- Balance links in the same power network
+    local networks = {}
+    for _, edge in pairs(global.universal_edges.edges) do
+        if not edge.linked_power then
+            goto continue
+        end
+        for _offset, link in pairs(edge.linked_power) do
+            if not link then
+                log("FATAL: Received power for non-existant link at offset " .. link.offset)
+                goto continue2
+            end
+            if not link.eei then
+                log("FATAL: received power for a link that does not have an eei " .. link.offset)
+                goto continue2
+            end
+            if link.eei.valid then
+                local network = link.eei.electric_network_id
+                if not networks[network] then
+                    networks[network] = {}
+                end
+                networks[network][#networks[network] + 1] = link
+            end
+            ::continue2::
+        end
+        ::continue::
+    end
+	for _id, network in pairs(networks) do
+		local total_energy = 0
+		for _, link in pairs(network) do
+			total_energy = total_energy + link.eei.energy + (link.lua_buffered_energy or 0)
+		end
+		local average_energy = total_energy / #network
+        for _, link in pairs(network) do
+			link.eei.electric_buffer_size = math.max(link.eei.electric_buffer_size, link.eei.energy + (link.lua_buffered_energy or 0), average_energy)
+			link.eei.energy = average_energy
+		end
+	end
 end
 
 local function receive_transfers(edge, power_transfers)