Start rewriting plugin on top of new sync protocol

plugin/src/ServeSession.lua

@@ -0,0 +1,99 @@
+local t = require(script.Parent.Parent.t)
+
+local strict = require(script.Parent.strict)
+
+local Status = strict("Session.Status", {
+	NotStarted = "NotStarted",
+	Connecting = "Connecting",
+	Connected = "Connected",
+	Disconnected = "Disconnected",
+})
+
+local function DEBUG_printPatch(patch)
+	local HttpService = game:GetService("HttpService")
+
+
+	for removed in ipairs(patch.removed) do
+		print("Remove:", removed)
+	end
+
+	for id, added in pairs(patch.added) do
+		print("Add:", id, HttpService:JSONEncode(added))
+	end
+
+	for updated in ipairs(patch.updated) do
+		print("Update:", HttpService:JSONEncode(updated))
+	end
+end
+
+local ServeSession = {}
+ServeSession.__index = ServeSession
+
+ServeSession.Status = Status
+
+local validateServeOptions = t.strictInterface({
+	apiContext = t.table,
+	reconciler = t.table,
+})
+
+function ServeSession.new(options)
+	assert(validateServeOptions(options))
+
+	local self = {
+		__status = Status.NotStarted,
+		__apiContext = options.apiContext,
+		__reconciler = options.reconciler,
+		__statusChangedCallback = nil,
+	}
+
+	setmetatable(self, ServeSession)
+
+	return self
+end
+
+function ServeSession:onStatusChanged(callback)
+	self.__statusChangedCallback = callback
+end
+
+function ServeSession:start()
+	self:__setStatus(Status.Connecting)
+
+	self.__apiContext:connect()
+		:andThen(function(serverInfo)
+			self:__setStatus(Status.Connected)
+
+			local rootInstanceId = serverInfo.rootInstanceId
+
+			return self.__apiContext:read({ rootInstanceId })
+				:andThen(function(readResponseBody)
+					local hydratePatch = self.__reconciler:hydrate(
+						readResponseBody.instances,
+						rootInstanceId,
+						game
+					)
+
+					DEBUG_printPatch(hydratePatch)
+
+					-- TODO: Apply the patch generated by hydration. We should
+					-- eventually prompt the user about this since it's a
+					-- conflict between Rojo and their current place state.
+				end)
+		end)
+		:catch(function(err)
+			self:__setStatus(Status.Disconnected, err)
+		end)
+end
+
+function ServeSession:stop()
+	self:__setStatus(Status.Disconnected)
+end
+
+function ServeSession:__setStatus(status, detail)
+	self.__status = status
+
+	if self.__statusChangedCallback ~= nil then
+		self.__statusChangedCallback(status, detail)
+	end
+end
+
+return ServeSession