feat(lua-client): 新增 Lua 客户端 SDK 及示例
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@@ -0,0 +1,41 @@
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local json = require("dkjson")
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local Cache = {}
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Cache.__index = Cache
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local CACHE_FILE = "config-cache.json"
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function Cache.new(cache_dir)
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local self = setmetatable({}, Cache)
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self.cache_dir = cache_dir or "."
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return self
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end
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function Cache:write(data)
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local path = self.cache_dir .. "/" .. CACHE_FILE
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local file = io.open(path, "w")
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if not file then
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return false, "cannot open cache file: " .. path
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end
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local str = json.encode(data, { indent = true })
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file:write(str)
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file:close()
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return true
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end
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function Cache:read()
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local path = self.cache_dir .. "/" .. CACHE_FILE
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local file = io.open(path, "r")
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if not file then
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return nil, "cache file not found"
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end
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local str = file:read("*a")
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file:close()
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local data, _, err = json.decode(str)
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if err then
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return nil, "json decode error: " .. err
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end
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return data
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end
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return Cache
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@@ -0,0 +1,219 @@
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local http = require("socket.http")
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local ltn12 = require("ltn12")
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local json = require("dkjson")
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local Config = require("kenaito_conf.config")
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local Cache = require("kenaito_conf.cache")
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local Listener = require("kenaito_conf.listener")
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local Client = {}
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Client.__index = Client
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function Client.new(opts)
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local config = opts.config
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if not config then
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error("config is required")
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end
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local self = setmetatable({}, Client)
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self.config = config
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self.cache = Cache.new(config.cache_dir)
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self.listener = Listener.new()
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self.configs = {}
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self.last_time = 0
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self.started = false
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self.stop = false
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return self
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end
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function Client:on_change(handler)
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self.listener:on_change(handler)
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end
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function Client:get(key)
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return self.configs[key]
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end
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function Client:get_all()
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local result = {}
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for k, v in pairs(self.configs) do
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result[k] = v
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end
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return result
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end
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function Client:start()
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if self.started then
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return
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end
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self.started = true
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local ok, err = self:_fetch_all()
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if not ok then
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print("[ConfigClient] fetch all configs error: " .. tostring(err) .. ", trying cache")
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local cached, cache_err = self.cache:read()
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if cached then
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self:_apply_configs(cached)
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local count = 0
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for _ in pairs(self.configs) do
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count = count + 1
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end
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print("[ConfigClient] loaded " .. count .. " configs from cache")
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else
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error("fetch configs failed and no cache: " .. tostring(err))
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end
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end
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end
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function Client:stop()
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self.stop = true
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end
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function Client:sync_once()
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local ok, err = self:_fetch_changed()
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if not ok then
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print("[ConfigClient] sync error: " .. tostring(err))
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end
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end
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function Client:_http_post(url, payload)
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local request_body = json.encode(payload)
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local response_body = {}
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local res, code, response_headers = http.request{
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url = url,
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method = "POST",
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headers = {
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["Content-Type"] = "application/json",
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["Content-Length"] = #request_body
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},
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source = ltn12.source.string(request_body),
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sink = ltn12.sink.table(response_body)
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}
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if res == nil then
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return nil, "HTTP request failed: " .. tostring(code)
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end
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if code ~= 200 then
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return nil, "HTTP " .. code
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end
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local response_str = table.concat(response_body)
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local data, _, err = json.decode(response_str)
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if err then
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return nil, "JSON decode error: " .. err
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end
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return data
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end
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function Client:_fetch_all()
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local url = self.config.base_url .. "/api/fetchAllConfigs"
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local payload = {
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appName = self.config.app_name,
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env = self.config.env,
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version = self.config.version,
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ignoreGlobal = self.config.ignore_global,
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token = self.config.token
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}
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local data, err = self:_http_post(url, payload)
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if not data then
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return false, err
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end
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if data.code and data.code ~= 0 then
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return false, "server error: " .. (data.msg or "unknown")
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end
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if data["latest.fetch.timestamp"] then
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self.last_time = tonumber(data["latest.fetch.timestamp"])
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end
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self.cache:write(data)
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self:_apply_configs(data)
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local count = 0
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for _ in pairs(self.configs) do
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count = count + 1
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end
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print("[ConfigClient] fetched " .. count .. " configs")
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return true
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end
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function Client:_fetch_changed()
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local url = self.config.base_url .. "/api/fetchChangedConfigs"
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local payload = {
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appName = self.config.app_name,
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env = self.config.env,
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version = self.config.version,
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lastTime = self.last_time,
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ignoreGlobal = self.config.ignore_global,
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token = self.config.token
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}
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local result, err = self:_http_post(url, payload)
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if not result then
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return false, err
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end
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if result.code and result.code ~= 0 then
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return false, "server error code: " .. result.code
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end
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local changed_data = result.data or {}
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if changed_data["latest.fetch.timestamp"] then
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self.last_time = tonumber(changed_data["latest.fetch.timestamp"])
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changed_data["latest.fetch.timestamp"] = nil
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end
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-- 处理删除的配置
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if changed_data.deletedKeys and changed_data.deletedKeys ~= "" then
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local deleted_keys = {}
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for key in string.gmatch(changed_data.deletedKeys, "([^,]+)") do
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table.insert(deleted_keys, key)
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self.configs[key] = nil
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end
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print("[ConfigClient] " .. #deleted_keys .. " configs deleted: " .. table.concat(deleted_keys, ", "))
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changed_data.deletedKeys = nil
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end
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-- 处理变更的配置
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local has_changes = false
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local changed_keys = {}
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for k, v in pairs(changed_data) do
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if type(v) == "string" then
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self.configs[k] = v
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table.insert(changed_keys, k)
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has_changes = true
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end
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end
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if has_changes then
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local changed = {}
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for _, k in ipairs(changed_keys) do
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changed[k] = self.configs[k]
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end
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self.listener:notify(changed)
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print("[ConfigClient] " .. #changed_keys .. " configs changed: " .. table.concat(changed_keys, ", "))
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end
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return true
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end
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function Client:_apply_configs(data)
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for k, v in pairs(data) do
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-- 跳过元数据
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if k:sub(1, 8) == "kenaito." or k == "latest.fetch.timestamp" then
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-- skip
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elseif type(v) == "string" then
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self.configs[k] = v
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end
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end
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end
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return Client
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@@ -0,0 +1,18 @@
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local Config = {}
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Config.__index = Config
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function Config.new(opts)
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opts = opts or {}
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local self = setmetatable({}, Config)
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self.base_url = opts.base_url or "http://localhost:8080"
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self.app_name = opts.app_name or ""
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self.env = opts.env or "dev"
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self.version = opts.version or "latest"
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self.token = opts.token or ""
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self.sync_interval = opts.sync_interval or 10
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self.ignore_global = opts.ignore_global or false
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self.cache_dir = opts.cache_dir or "."
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return self
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end
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return Config
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@@ -0,0 +1,8 @@
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local Client = require("kenaito_conf.client")
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local Config = require("kenaito_conf.config")
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return {
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Client = Client,
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Config = Config,
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_VERSION = "1.0.3"
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}
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@@ -0,0 +1,23 @@
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local Listener = {}
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Listener.__index = Listener
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function Listener.new()
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local self = setmetatable({}, Listener)
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self.handlers = {}
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return self
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end
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function Listener:on_change(handler)
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table.insert(self.handlers, handler)
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end
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function Listener:notify(changed)
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for _, handler in ipairs(self.handlers) do
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local ok, err = pcall(handler, changed)
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if not ok then
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print("[ConfigClient] change handler error: " .. tostring(err))
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end
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end
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end
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return Listener
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