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    # 利用Nchan快速打造即時通知系統 - 翁傳翔 (herb) {%hackmd j86FNbMoRoeN4Xn0pg5ofw %} 隕石開發法... - 需求增加:一般訊息、即時聊天 - 原本架構限制 - 必須依賴第三方服務 - 無法控制時間 - 資料即時更新技術方案: - Polling - Long Polling - WebSocket - 原生 PHP 不好實作 WebSocket Server - 選擇更換語言缺點 - 花費時間學習新語言 - 因不熟悉新語言 實作過程注定踩雷 - 部分業務邏輯需要用新語言實作 - 部分舊系統需開放 API 給新系統 - 原本吃緊的人力又被分成兩半 - 未來交接必須維持 - 適合有時間沒上帝的團隊... - 不更換後端語言 - Swoole - c語言撰寫 - 性能測試裡 Swoole 是最高效的 - 但無法完全兼容舊的程式碼 - 在 Swoole 4.0 之前,有部份語法不支援 Coroutine (call_user_func、array_map、__destrut) - 許多同步(Blocking IO) 語法 - 需要暸解哪些是會成同步的程式碼 - 使用太多第三方套件無法一一清查 - Workerman - 純php - 為何選擇 NChan > NChan 為 Nginx + Channel 的結合名稱 - 支援協定很多 - 簡單易用 - 與nginx完美結合 - 保證單一 Channel 下絕對不會有重複訊息或漏失訊息的情況 - 同一個連線可同時訂閱上百個 channel - 提供 hooks 跟 callback 可輕易與現有程式結合 - 搭配 Redis 可水平擴展 - 若與 redis cluster 搭配則可達到自動容錯與高可用性 - 高性能(依據官方測試數據,使用Xeon L5630 8 HT core CPU,產生8個nginx worker,在七萬訂閱者情況下,只需要不到0.2秒的時間即可將訊息傳遞完畢) - 架構更新 - 對websocket做壓力測試 -手刻 - https://github.com/herb123456/websocket-loading-test ###### tags: `MW18`

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