394 lines
11 KiB
Lua
394 lines
11 KiB
Lua
-- Network graphs are built eminating from provider nodes.
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--[[
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TODO:
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Currently, there's a problem where storage nodes are allowed to create their own graph.
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When placing the storage onto a cable, it will add itself to the graph of that cable.
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But, when placing a cable onto the storage, that cable is added to the storage's own graph
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and thus cannot be connected to the previous graph.
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]]
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-- Network cache
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ele.graphcache = {devices = {}}
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---------------------
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-- Graph Functions --
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---------------------
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local function table_has_string(arr, str)
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for _,astr in ipairs(arr) do
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if astr == str then
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return true
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end
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end
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return false
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end
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local function add_node(nodes, pos, pnodeid)
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local node_id = minetest.hash_node_position(pos)
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if not ele.graphcache.devices[node_id] then
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ele.graphcache.devices[node_id] = {}
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end
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if not table_has_string(ele.graphcache.devices[node_id], pnodeid) then
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table.insert(ele.graphcache.devices[node_id], pnodeid)
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end
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if nodes[node_id] then
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return false
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end
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nodes[node_id] = pos
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return true
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end
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local function add_conductor_node(nodes, pos, pnodeid, queue)
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if add_node(nodes, pos, pnodeid) then
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queue[#queue + 1] = pos
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end
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end
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local function check_node(users, providers, conductors, pos, pr_pos, pnodeid, queue)
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if minetest.pos_to_string(pos) == pnodeid then return end
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ele.helpers.get_or_load_node(pos)
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local node = minetest.get_node(pos)
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local meta = minetest.get_meta(pos)
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if ele.helpers.get_item_group(node.name, "ele_conductor") then
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add_conductor_node(conductors, pos, pnodeid, queue)
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return
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end
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if not ele.helpers.get_item_group(node.name, "ele_machine") then
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return
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end
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if ele.helpers.get_item_group(node.name, "ele_user") or
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ele.helpers.get_item_group(node.name, "ele_storage") then
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add_node(users, pos, pnodeid)
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elseif ele.helpers.get_item_group(node.name, "ele_provider") then
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add_node(providers, pos, pnodeid)
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end
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end
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local function traverse_network(users, providers, conductors, pos, pr_pos, pnodeid, queue)
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local positions = {
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{x=pos.x+1, y=pos.y, z=pos.z},
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{x=pos.x-1, y=pos.y, z=pos.z},
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{x=pos.x, y=pos.y+1, z=pos.z},
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{x=pos.x, y=pos.y-1, z=pos.z},
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{x=pos.x, y=pos.y, z=pos.z+1},
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{x=pos.x, y=pos.y, z=pos.z-1}}
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for _, cur_pos in pairs(positions) do
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check_node(users, providers, conductors, cur_pos, pr_pos, pnodeid, queue)
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end
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end
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local function discover_branches(pr_pos, positions)
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local provider = minetest.get_node(pr_pos)
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local pnodeid = minetest.pos_to_string(pr_pos)
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if ele.graphcache[pnodeid] then
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local cached = ele.graphcache[pnodeid]
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return cached.users, cached.providers
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end
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local users = {}
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local providers = {}
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local queue = {}
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local conductors = {}
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for _,pos in ipairs(positions) do
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queue = {}
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local node = minetest.get_node(pos)
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if node and ele.helpers.get_item_group(node.name, "ele_conductor") then
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add_conductor_node(conductors, pos, pnodeid, queue)
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elseif node and ele.helpers.get_item_group(node.name, "ele_machine") then
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queue = {pr_pos}
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end
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while next(queue) do
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local to_visit = {}
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for _, posi in ipairs(queue) do
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traverse_network(users, providers, conductors, posi, pr_pos, pnodeid, to_visit)
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end
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queue = to_visit
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end
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end
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-- Add self to providers
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add_node(providers, pr_pos, pnodeid)
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users = ele.helpers.flatten(users)
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providers = ele.helpers.flatten(providers)
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conductors = ele.helpers.flatten(conductors)
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ele.graphcache[pnodeid] = {conductors = conductors, users = users, providers = providers}
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return users, providers
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end
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-----------------------
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-- Main Transfer ABM --
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-----------------------
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local function give_node_power(pos, available)
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local user_meta = minetest.get_meta(pos)
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local capacity = ele.helpers.get_node_property(user_meta, pos, "capacity")
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local inrush = ele.helpers.get_node_property(user_meta, pos, "inrush")
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local storage = user_meta:get_int("storage")
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local total_add = 0
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if available >= inrush then
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total_add = inrush
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elseif available < inrush then
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total_add = available
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end
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if total_add + storage > capacity then
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total_add = capacity - storage
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end
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if storage >= capacity then
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total_add = 0
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storage = capacity
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end
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return total_add, storage
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end
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minetest.register_abm({
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nodenames = {"group:ele_provider"},
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label = "elepower Power Transfer Tick",
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interval = 1,
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chance = 1,
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action = function(pos, node, active_object_count, active_object_count_wider)
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local meta = minetest.get_meta(pos)
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local meta1 = nil
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local users = {}
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local providers = {}
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local providerdef = minetest.registered_nodes[node.name]
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-- TODO: Customizable output sides
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local positions = {
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{x=pos.x, y=pos.y-1, z=pos.z},
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{x=pos.x, y=pos.y+1, z=pos.z},
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{x=pos.x-1, y=pos.y, z=pos.z},
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{x=pos.x+1, y=pos.y, z=pos.z},
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{x=pos.x, y=pos.y, z=pos.z-1},
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{x=pos.x, y=pos.y, z=pos.z+1}
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}
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local branches = {}
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for _,pos1 in ipairs(positions) do
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local pnode = minetest.get_node(pos1)
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local name = pnode.name
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local networked = ele.helpers.get_item_group(name, "ele_machine") or
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ele.helpers.get_item_group(name, "ele_conductor")
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if networked then
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branches[#branches + 1] = pos1
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end
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end
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-- No possible branches found
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if #branches == 0 then
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minetest.forceload_free_block(pos)
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return
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else
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minetest.forceload_block(pos)
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end
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-- Find all users and providers
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users, providers = discover_branches(pos, branches)
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-- Calculate power data
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local pw_supply = 0
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local pw_demand = 0
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for _, spos in ipairs(providers) do
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local smeta = minetest.get_meta(spos)
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local pw_storage = smeta:get_int("storage")
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local p_output = ele.helpers.get_node_property(smeta, spos, "output")
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if p_output and pw_storage >= p_output then
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pw_supply = pw_supply + p_output
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elseif p_output and pw_storage < p_output then
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pw_supply = pw_supply + pw_storage
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end
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end
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-- Give power to users
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for _,ndv in ipairs(users) do
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if pw_demand > pw_supply then
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break
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end
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-- Sharing: Determine how much each user gets
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local user_gets, user_storage = give_node_power(ndv, (pw_supply - pw_demand))
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pw_demand = pw_demand + user_gets
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if user_gets > 0 then
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local user_meta = minetest.get_meta(ndv)
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user_meta:set_int("storage", user_storage + user_gets)
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-- Set timer on this node
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ele.helpers.start_timer(ndv)
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end
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end
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-- Take the power from provider nodes
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if pw_demand > 0 then
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for _, spos in ipairs(providers) do
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if pw_demand == 0 then break end
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local smeta = minetest.get_meta(spos)
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local pw_storage = smeta:get_int("storage")
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if pw_storage >= pw_demand then
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smeta:set_int("storage", pw_storage - pw_demand)
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pw_demand = 0
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else
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pw_demand = pw_demand - pw_storage
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smeta:set_int("storage", 0)
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end
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ele.helpers.start_timer(spos)
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end
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end
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end,
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})
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local function check_connections(pos)
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local connections = {}
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local positions = {
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{x=pos.x+1, y=pos.y, z=pos.z},
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{x=pos.x-1, y=pos.y, z=pos.z},
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{x=pos.x, y=pos.y+1, z=pos.z},
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{x=pos.x, y=pos.y-1, z=pos.z},
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{x=pos.x, y=pos.y, z=pos.z+1},
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{x=pos.x, y=pos.y, z=pos.z-1}}
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for _,connected_pos in ipairs(positions) do
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local name = minetest.get_node(connected_pos).name
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if ele.helpers.get_item_group(name, "ele_conductor") or ele.helpers.get_item_group(name, "ele_machine") then
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table.insert(connections, connected_pos)
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end
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end
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return connections
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end
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-- Update networks when a node has been placed or removed
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function ele.clear_networks(pos)
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local node = minetest.get_node(pos)
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local meta = minetest.get_meta(pos)
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local name = node.name
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local placed = name ~= "air"
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local positions = check_connections(pos)
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if #positions < 1 then return end
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local hash_pos = minetest.hash_node_position(pos)
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local dead_end = #positions == 1
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for _,connected_pos in ipairs(positions) do
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local networks = ele.graphcache.devices[minetest.hash_node_position(connected_pos)] or
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{minetest.pos_to_string(connected_pos)}
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for _,net in ipairs(networks) do
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if net and ele.graphcache[net] then
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-- This is so we can break the pipeline instead of the network search loop
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while true do
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if dead_end and placed then
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-- Dead end placed, add it to the network
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-- Get the networks
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local network_ids = ele.graphcache.devices[minetest.hash_node_position(positions[1])] or
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{minetest.pos_to_string(positions[1])}
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if not #network_ids then
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-- We're evidently not on a network, nothing to add ourselves to
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break
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end
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for _, int_net in ipairs(network_ids) do
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if ele.graphcache[int_net] then
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local network = ele.graphcache[int_net]
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-- Actually add it to the (cached) network
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if not ele.graphcache.devices[hash_pos] then
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ele.graphcache.devices[hash_pos] = {}
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end
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if not table_has_string(ele.graphcache.devices[hash_pos], int_net) then
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table.insert(ele.graphcache.devices[hash_pos], int_net)
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end
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if ele.helpers.get_item_group(name, "ele_conductor") then
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table.insert(network.conductors, pos)
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elseif ele.helpers.get_item_group(name, "ele_machine") then
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if ele.helpers.get_item_group(name, "ele_user") or
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ele.helpers.get_item_group(name, "ele_storage") then
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table.insert(network.users, pos)
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elseif ele.helpers.get_item_group(name, "ele_provider") then
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table.insert(network.providers, pos)
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end
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end
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end
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end
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break
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elseif dead_end and not placed then
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-- Dead end removed, remove it from the network
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-- Get the network
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local network_ids = ele.graphcache.devices[minetest.hash_node_position(positions[1])] or
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{minetest.pos_to_string(positions[1])}
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if not #network_ids then
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-- We're evidently not on a network, nothing to remove ourselves from
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break
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end
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for _,int_net in ipairs(network_ids) do
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if ele.graphcache[int_net] then
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local network = ele.graphcache[int_net]
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-- The network was deleted.
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if int_net == minetest.pos_to_string(pos) then
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for _,v in ipairs(network.conductors) do
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local pos1 = minetest.hash_node_position(v)
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ele.graphcache.devices[pos1] = nil
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end
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ele.graphcache[int_net] = nil
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else
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-- Search for and remove device
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ele.graphcache.devices[hash_pos] = nil
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for tblname, table in pairs(network) do
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if type(table) == "table" then
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for devicenum, device in pairs(table) do
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if vector.equals(device, pos) then
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table[devicenum] = nil
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end
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end
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end
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end
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end
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end
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end
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break
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else
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-- Not a dead end, so the whole network needs to be recalculated
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for _,v in ipairs(ele.graphcache[net].conductors) do
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local pos1 = minetest.hash_node_position(v)
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ele.graphcache.devices[pos1] = nil
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end
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ele.graphcache[net] = nil
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break
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end
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break
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end
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end
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end
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end
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end
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