热更新脚本

local function remove_old_mounts()
	local mounts = liveupdate.get_mounts() -- 得到 mounts 表

    -- 每个 mount 包含: mount.uri, mount.priority, mount.name
	for _,mount in ipairs(mounts) do

        -- 这需要文件名是唯一的, 以便我们不会从不同卷里获得同名文件
        -- 这里数据由开发者创建作为给卷指定元数据的方法
		local version_data = sys.load_resource("/version_" .. mount.name .. ".json")

		if version_data then
			version_data = json.decode(version_data)
		else
			version_data = {version = 0} -- 没有版本文件的话, 很可能是老旧/不可用卷
		end

        -- 指定卷版本到游戏支持的版本
        if version_data.version < sys.get_config_int("game.minimum_lu_version") then
            -- 不可用的话, 卸载它!
            liveupdate.remove_mount(mount.name)
        end
	end
end

-- 你要跟踪哪个卷里有那些内容
-- 本例中, 我们只用一个热更新卷, 包含所有遗漏资源.
-- 如果需要用多个卷, 必须相应地构建好下载表
local lu_infos = {
    liveupdate = {
        name = "liveupdate",
        priority = 10,
    }
}

local function get_lu_info_for_level(level_name)
    if level_name == "level1" then
        return lu_infos['liveupdate']
    end
end

local function mount_zip(self, name, priority, path, callback)
	liveupdate.add_mount(name, "zip:" .. path, priority, function(_uri, _path, _status) -- <1>
		callback(_uri, _path, _status)
	end)
end

function init(self)
    self.http_url = sys.get_config_string("game.http_url", nil) -- <2>

    local level_name = "level1"

    local info = get_lu_archive_for_level(level_name) -- <3>

    msg.post("#", "load_level", {level = "level1", info = info }) -- <4>
end

function on_message(self, message_id, message, sender)
    if message_id == hash("load_level") then
        local missing_resources = collectionproxy.missing_resources("#" .. message.level) -- <5>

        if #missing_resources then
            msg.post("#", "download_archive", message) -- <6>
        else
            msg.post("#" .. message.level, "load")
        end

    elseif message_id == hash("download_archive") then
		local zip_filename = message.info.name .. ".zip"
		local download_path = sys.get_save_file("mygame", zip_filename)
        local url = self.http_url .. "/" .. zip_filename

        -- 开始请求. 可以使用 credentials
        http.request(url, "GET", function(self, id, response) -- <7>
			if response.status == 200 or response.status == 304 then
				mount_zip(self, message.info.name, message.info.priority, download_path, function(uri, path, status) -- <8>
					msg.post("#", "load_level", message) -- 尝试重新加载 level
				end)

			else
				print("Failed to download archive ", download_path, "from", url, ":", get_status_string(status))
			end
		end, nil, nil, {path=download_path})

    elseif message_id == hash("proxy_loaded") then -- level 已加载, 可以 enable 了
        msg.post(sender, "init")
        msg.post(sender, "enable")
    end
end