小需求推進新語言快速學習：nginx lua 根據 user_agent 顯示不一樣的頁面

時間 2019-11-10

標籤需求推進語言快速學習 nginx lua 根據 user agent 顯示不一樣頁面欄目快樂工作简体版

原文原文鏈接

以前作一次分享如何快速學習一門新的語言的直播分享可是那是以實現一個後端框架的角度來說的，道理想通，咱們要以實際的需求出發。一個小小的需求，可能會遇到不少問題，可是搜索相關的關鍵字，就能快速實現出來，完成一個小目標，事半功倍。php

死記硬背手冊，太枯燥了，反正我是看不下去，不如直接來個小項目。下面開始：css

一個小需求

pc、mobile 一個地址有兩套頁面，須要在後端根據瀏覽器的 user_agent 來顯示不一樣的頁面。
經過 php 來作，固然能夠，可是活動頁面訪問量通常都比較大，想優化些，因此想嘗試下 lua。html

nginx 安裝 lua-nginx-module

能夠直接上 openresty，不過有時候就是想折騰。
安裝的步驟 https://mengkang.net/994.html （若是你想實踐的話再看吧）android

lua demo 腳本

-- 判斷是不是手機瀏覽器
function isMobile(userAgent)
    -- 99% 前三個都能匹配上吧
    local mobile = {
        "phone", "android", "mobile", "itouch", "ipod", "symbian", "htc", "palmos", "blackberry", "opera mini", "windows ce", "nokia", "fennec",
        "hiptop", "kindle", "mot", "webos", "samsung", "sonyericsson", "wap", "avantgo", "eudoraweb", "minimo", "netfront", "teleca"
    }
    userAgent = string.lower(userAgent)

    for i, v in ipairs(mobile) do
        if string.match(userAgent, v) then
            return true
        end
    end

    return false
end

-- 根據id + 瀏覽器類型展現活動頁面
function showPromotionHtml(id, isMobile)
    local path = "/data/www/mengkang/demo/promotion/"
    local filename

    if isMobile then
        path = path .. "mobile"
    else
        path = path .. "pc"
    end

    filename = path .. "/" .. id .. ".html"

    if file_exists(filename) then
        local file = io.open(filename,"r")
        io.input(file)
        print(io.read("*a"))
        io.close(file)
    else
        print("文件不存在: " .. string.gsub(filename, "/data/www/mengkang/demo", ""))
    end
end

-- 判斷文件是否存在
function file_exists(path)
    local file = io.open(path, "rb")
    if file then file:close() end
    return file ~= nil
end

local id = 1
local userAgent = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.79 Safari/537.36"
showPromotionHtml(id, isMobile(userAgent))

小結

做爲一個 lua 菜鳥，經過這個小需求我查了哪些資料nginx

變量的定義
函數的寫法
循環的瞭解
判斷邏輯的寫法
註釋的寫法
文件 i/o
字符串拼接 ..
字符串查找 string.match
字符串轉小寫 string.lowerweb

稍微調整適配 nginx lua 模塊

-- 判斷是不是手機瀏覽器
function isMobile(userAgent)
    -- 99% 前三個都能匹配上吧
    local mobile = {
        "phone", "android", "mobile", "itouch", "ipod", "symbian", "htc", "palmos", "blackberry", "opera mini", "windows ce", "nokia", "fennec",
        "hiptop", "kindle", "mot", "webos", "samsung", "sonyericsson", "wap", "avantgo", "eudoraweb", "minimo", "netfront", "teleca"
    }
    userAgent = string.lower(userAgent)

    for i, v in ipairs(mobile) do
        if string.match(userAgent, v) then
            return true
        end
    end

    return false
end

-- 根據id + 瀏覽器類型展現活動頁面
function showPromotionHtml(id, isMobile)
    local path = "/data/www/mengkang/demo/promotion/"
    local filename

    if isMobile then
        path = path .. "mobile"
    else
        path = path .. "pc"
    end

    filename = path .. "/" .. id .. ".html"

    if file_exists(filename) then
        local file = io.open(filename,"r")
        io.input(file)
        ngx.say(io.read("*a"))
        io.close(file)
    else
        ngx.say("file not found : " .. string.gsub(filename, "/data/www/mengkang/demo", ""))
    end
end

-- 判斷文件是否存在
function file_exists(path)
    local file = io.open(path, "rb")
    if file then file:close() end
    return file ~= nil
end

local id = ngx.var.id
local userAgent = ngx.req.get_headers().user_agent
showPromotionHtml(id, isMobile(userAgent))

nginx 配置

server
{
    listen       80;
    server_name mengkang.net

    location ~ /promotion/(\d+)
    {
        set $id $1;
        default_type "text/html";
        content_by_lua_file /data/www/lua/1.lua;
    }
}

演示地址

https://mengkang.net/promotion/1
https://mengkang.net/promotio...
切換 user_agent 便可看到，不一樣的 pc 和 mobile 兩個版本的頁面segmentfault

和 php 性能對比

nginx 配置

rewrite ^/promotion2/(.*)$  /demo/promotion.php last;

php 代碼

<?php
header("Content-type:text/html;charset=utf-8");
header_remove('x-powered-by');
ini_set('display_errors', 'Off');

function getId(){
    $uri = $_SERVER["REQUEST_URI"];
    $tmp = explode("?",$uri);
    $uri = $tmp[0];
    $uri = trim($uri,"/");
    $tmp = explode("/",$uri);
    return intval(array_pop($tmp));
}

function isMobile()
{
    $user_agent = isset($_SERVER['HTTP_USER_AGENT']) ? strtolower ( $_SERVER['HTTP_USER_AGENT'] ) : '';

    if ( preg_match ( "/phone|itouch|ipod|symbian|android|htc_|htc-|palmos|blackberry|opera mini|windows ce|nokia|fennec|hiptop|kindle|mot |mot-|webos\/|samsung|sonyericsson|mobile|pda;|avantgo|eudoraweb|minimo|netfront|nintendo/", $user_agent ) ) {
        return true;
    }

    return false;
}

$id = getId();

$isMobile = isMobile();


if ($isMobile){
    $filename = __DIR__."/promotion/mobile/".$id.".html";
}else{
    $filename = __DIR__."/promotion/pc/".$id.".html";
}


if (file_exists($filename)) {
    echo file_get_contents($filename);
}else{
    echo "file not found : /promotion/pc/".$id.".html";
}

exit;

也就是說訪問 http://mengkang.net/promotion/1 和 http://mengkang.net/promotion2/1 是同樣的結果windows

配置說明

雙核4G
nginx 配置一致
php 版本：7.0.11
php-fpm 配置：後端

pm = dynamic
pm.max_children = 10
pm.start_servers = 4
pm.min_spare_servers = 4
pm.max_spare_servers = 10

php 壓測結果

ab -n 1000 -c 100 http://mengkang.net/promotion2/1
Requests per second:    3105.21 [#/sec] (mean)
Time per request:       32.204 [ms] (mean)

ab -n 4000 -c 400 http://mengkang.net/promotion2/1
Requests per second:    3361.87 [#/sec] (mean)
Time per request:       118.981 [ms] (mean)
Complete requests:      4000
Failed requests:        259

ab -n 8000 -c 800 http://mengkang.net/promotion2/1
Requests per second:    3358.20 [#/sec] (mean)
Time per request:       238.223 [ms] (mean)
Complete requests:      8000
Failed requests:        654

ab -n 10000 -c 1000 http://mengkang.net/promotion2/1
Requests per second:    3275.30 [#/sec] (mean)
Time per request:       305.315 [ms] (mean)
Complete requests:      10000
Failed requests:        9150

lua 壓測結果

ab -n 1000 -c 100 http://mengkang.net/promotion/1
Requests per second:    6014.89 [#/sec] (mean)
Time per request:       16.625 [ms] (mean)

ab -n 4000 -c 400 http://mengkang.net/promotion/1
Complete requests:      4000
Failed requests:        0
Requests per second:    6190.57 [#/sec] (mean)
Time per request:       64.614 [ms] (mean)

ab -n 8000 -c 800 http://mengkang.net/promotion/1
Complete requests:      8000
Failed requests:        0
Requests per second:    7046.66 [#/sec] (mean)
Time per request:       113.529 [ms] (mean

ab -n 10000 -c 1000 http://mengkang.net/promotion/1
Complete requests:      10000
Failed requests:        0
Requests per second:    5670.38 [#/sec] (mean)
Time per request:       176.355 [ms] (mean)