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local class = require"common.class"
local Chunk = require"common.chunk".Chunk
local json = require"common.dkjson"
local db = require'db'
local ChunkS = class.extend(Chunk)
function ChunkS.make(cls,...)
local self = Chunk.make(cls,...)
self.dirty = false
return self
end
function ChunkS.apply_migrations(self)
-- if tile format has changed, perform updates here
for i,t in ipairs(self.tiles) do
if t == false then self.tiles[i] = 0
elseif t == true then self.tiles[i] = 9 end
end
end
function ChunkS.load_from_disk(cls,cp)
-- tries to load from database. returns nil if not there.
local txn,dbi = db.get_db('chunks')
local d = dbi[tostring(cp)]
txn:commit()
if not d then return nil end
local j = json.decode(d)
local self = cls:from_packet_data(j)
self:apply_migrations()
return self
end
function ChunkS.save_if_dirty(self,txn)
if self.dirty then
print("saving chunk",self.cp)
local dbi = txn:open'chunks'
dbi[tostring(self.cp)] = self:data_packet()
self.dirty = false
end
end
function ChunkS.set_at(self,...)
Chunk.set_at(self,...)
self.dirty = true
end
return {ChunkS=ChunkS}
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