Basic synchronization of edited objects

plugin/src/ApiContext.lua

@@ -57,14 +57,35 @@ function ApiContext:connect()
 
 			self.serverId = body.serverId
 			self.connected = true
-
-			return self:_retrieveMessages()
 		end)
 end
 
-function ApiContext:_retrieveMessages()
+function ApiContext:readAll()
 	if not self.connected then
-		return Promise.resolve()
+		return Promise.reject()
+	end
+
+	return Http.get(self.url .. "/read_all")
+		:andThen(function(response)
+			local body = response:json()
+
+			if body.serverId ~= self.serverId then
+				return Promise.reject("server changed ID")
+			end
+
+			self.messageCursor = body.messageCursor
+
+			return body.instances
+		end, function(err)
+			self.connected = false
+
+			return Promise.reject(err)
+		end)
+end
+
+function ApiContext:retrieveMessages()
+	if not self.connected then
+		return Promise.reject()
 	end
 
 	return Http.get(self.url .. "/subscribe/" .. self.messageCursor)
@@ -81,7 +102,7 @@ function ApiContext:_retrieveMessages()
 
 			self.messageCursor = body.messageCursor
 
-			return self:_retrieveMessages()
+			return self:retrieveMessages()
 		end, function(err)
 			self.connected = false
 

plugin/src/Session.lua

@@ -1,7 +1,4 @@
-local Promise = require(script.Parent.Parent.modules.Promise)
-
 local Config = require(script.Parent.Config)
-local Http = require(script.Parent.Http)
 local ApiContext = require(script.Parent.ApiContext)
 
 local REMOTE_URL = ("http://localhost:%d"):format(Config.port)
@@ -14,10 +11,59 @@ function Session.new()
 
 	setmetatable(self, Session)
 
-	local api = ApiContext.new(REMOTE_URL, function(message)
-		print("Got message:", message)
+	local created = {}
+
+	created["0"] = game:GetService("ReplicatedFirst")
+
+	local api
+	local function readAll()
+		print("Reading all...")
+
+		return api:readAll()
+			:andThen(function(instances)
+				for id, instance in pairs(instances) do
+					if id ~= "0" then
+						local existing = created[id]
+						if existing ~= nil then
+							pcall(existing.Destroy, existing)
+						end
+
+						local real = Instance.new(instance.className)
+						real.Name = instance.name
+
+						for key, value in pairs(instance.properties) do
+							real[key] = value
+						end
+
+						created[id] = real
+					end
+				end
+
+				for id, instance in pairs(instances) do
+					if id ~= "0" then
+						print("parent", created[id], created[tostring(instance.parent)])
+						created[id].Parent = created[tostring(instance.parent)]
+					end
+				end
+			end)
+	end
+
+	api = ApiContext.new(REMOTE_URL, function(message)
+		print("got message", message)
+
+		if message.type == "InstanceChanged" then
+			print("Instance", message.id, "changed!")
+			readAll()
+		else
+			warn("Unknown message type " .. message.type)
+		end
 	end)
+
 	api:connect()
+		:andThen(readAll)
+		:andThen(function()
+			return api:retrieveMessages()
+		end)
 
 	return self
 end