How do you learn a new language quickly? If you already know one language, you can think of all the others. A small demand, may encounter a lot of problems, but search related keywords, can quickly achieve it, complete a small goal, get twice the result with half the effort. Rote memorization of manual, too boring, anyway I can not read, it is better to direct a small project.
A small need
PC and Mobile Have two sets of pages in one address. You need to display different pages on the back end according to the user_Agent of the browser. Do it through PHP, of course, but the activity page view is generally relatively large, I want to optimize some, so I want to try Lua.
Nginx install lua – nginx – module
You can just go to OpenResty, but sometimes you just want to mess around. Installation steps mengkang.net/994.html (check it out if you want to practice)
Lua demo script
Function isMobile(userAgent) 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 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(" File does not exist: ".. string.gsub(filename, "/data/www/mengkang/demo", 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 "showPromotionHtml(ID, isMobile(userAgent))Copy the codesummary
As a lua newbie, I looked it up with this little requirement
Variable definition function writing loop understanding judgment logic writing comment writing file I/O string concatenation.. Match string to lowercase string.lower
Slight tweaks for nginx Lua module
Function isMobile(userAgent) 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 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", 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))Copy the codeNginx configuration
server { listen 80; server_name mengkang.net location ~ /promotion/(\d+) { set $id $1; default_type "text/html"; content_by_lua_file /data/www/lua/1.lua; }}Copy the codeNginx can also install lua modules separately, or use OpenResty. For separate installation, see mengkang.net/994.html
Demo address
Mengkang.net/promotion/1 mengkang.net/promotion/1… Switch user_Agent to see the pages of different PC and mobile versions
Compare performance with PHP
Nginx configuration
rewrite ^/promotion2/(.*)$ /demo/promotion.php last;Copy the codeThe PHP code
<? 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;Copy the codeThat is to say visit mengkang.net/promotion/1 and mengkang.net/promotion2/… It’s the same result
Configuration instructions
PHP version: 7.0.11 php-fPM configuration
pm = dynamic
pm.max_children = 10
pm.start_servers = 4
pm.min_spare_servers = 4
pm.max_spare_servers = 10Copy the codePHP pressure test results
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: Ab 259 - 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: Ab 654 - 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: 9150Copy the codeLua pressure test results
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)Copy the codeThe comparison shows that the performance hints are quite impressive. PHP QPS is around 3000 and nginx_lua QPS is around 7000. PHP starts to see more failed requests at 400 concurrent requests, and throughput starts to decline. Lua results in 1000 concurrent requests, and the number of failed requests is still zero.