{"id":101702,"date":"2021-10-19T22:23:37","date_gmt":"2021-10-19T20:23:37","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-servernoj-javascript-platformy-node-js-17-0"},"modified":"2021-10-19T22:23:37","modified_gmt":"2021-10-19T20:23:37","slug":"vypusk-servernoj-javascript-platformy-node-js-17-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/vypusk-servernoj-javascript-platformy-node-js-17-0","title":{"rendered":"Kiad\u00e1sra ker\u00fclt a Node.js 17.0 szerveroldali JavaScript platform.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Megjelent a Node.js 17.0, a JavaScript-alap\u00fa h\u00e1l\u00f3zati alkalmaz\u00e1sok futtat\u00e1s\u00e1ra szolg\u00e1l\u00f3 platform. A Node.js 17.0 a norm\u00e1l t\u00e1mogat\u00e1si ciklus\u00fa \u00e1ghoz tartozik, amelynek friss\u00edt\u00e9seit 2022 j\u00fanius\u00e1ig adj\u00e1k ki. N\u00e9h\u00e1ny napon bel\u00fcl befejez\u0151dik a Node.js 16 \u00e1g stabiliz\u00e1l\u00e1sa, amely LTS (Hossz\u00fa T\u00e1v\u00fa T\u00e1mogat\u00e1s) st\u00e1tuszt kap, \u00e9s 2024 \u00e1prilis\u00e1ig t\u00e1mogatni fogj\u00e1k. A kor\u00e1bbi LTS \u00e1g, a Node.js 14.0 t\u00e1mogat\u00e1sa 2023 \u00e1prilis\u00e1ig, m\u00edg a Node.js 12.0 \u00e1g\u00e9 2022 \u00e1prilis\u00e1ig tart.       <\/p>\n<p>F\u0151 fejleszt\u00e9sek:  <\/p>\n<ul>\n<li class=\"l\"> A V8 motor friss\u00edtve lett a 9.5 verzi\u00f3ra.\n<li class=\"l\"> \u041f\u0440\u043e\u0434\u043e\u043b\u0436\u0435\u043d\u0430 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f \u0432\u0430\u0440\u0438\u0430\u043d\u0442\u043e\u0432 \u0431\u0430\u0437\u043e\u0432\u043e\u0433\u043e API, \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043d\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u0430 \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u044b\u0445 \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u0439 Promise. \u0412 \u0434\u043e\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u043a \u0440\u0430\u043d\u0435\u0435 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043d\u044b\u043c API Timers Promises \u0438 Streams Promises \u0432 Node.js 17.0 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d API Readline Promise \u0434\u043b\u044f \u043f\u043e\u0441\u0442\u0440\u043e\u0447\u043d\u043e\u0433\u043e \u0447\u0442\u0435\u043d\u0438\u044f \u0434\u0430\u043d\u043d\u044b\u0445 \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c \u043c\u043e\u0434\u0443\u043b\u044f readline.       import * as readline from &#8216;node:readline\/promises&#8217;;     import { stdin as input, stdout as output } from &#8216;process&#8217;;       const rl = readline.createInterface({ input, output });       const answer = await rl.question(&#8216;What do you think of Node.js?&#8217;);       console.log(&#8216;Thank you for your valuable feedback: ${answer}&#8217;);       rl.close();\n<li class=\"l\"> A csomagban l\u00e9v\u0151 OpenSSL k\u00f6nyvt\u00e1r friss\u00edtve lett a 3.0 verzi\u00f3ra (a QUIC protokoll t\u00e1mogat\u00e1s\u00e1val rendelkez\u0151 quictls\/openssl forkot haszn\u00e1lj\u00e1k).\n<li class=\"l\"> A Node.js verzi\u00f3j\u00e1nak megjelen\u00edt\u00e9se a hibak\u00f6vet\u00e9si nyomokban, melyek fat\u00e1lis hib\u00e1k eset\u00e9n jelennek meg, amelyek az alkalmaz\u00e1s le\u00e1ll\u00e1s\u00e1hoz vezetnek.      <\/ul>\n<p>Ezen k\u00edv\u00fcl \u00e9rdemes megeml\u00edteni, hogy a Node.js aktu\u00e1lis \u00e1gaiban k\u00e9t sebezhet\u0151s\u00e9get (CVE-2021-22959, CVE-2021-22960) sz\u00fcntettek meg, amelyek lehet\u0151v\u00e9 tett\u00e9k az &#171;HTTP Request Smuggling&#187; (HRS) t\u00edpus\u00fa t\u00e1mad\u00e1sokat. Ezek a t\u00e1mad\u00e1sok lehet\u0151v\u00e9 tett\u00e9k, hogy a felhaszn\u00e1l\u00f3k speci\u00e1lisan form\u00e1zott kliensk\u00e9r\u00e9sek k\u00fcld\u00e9s\u00e9vel be\u00e9kel\u0151djenek m\u00e1s felhaszn\u00e1l\u00f3k k\u00e9r\u00e9seibe, amelyeket ugyanabban a folyamban dolgoznak fel a frontend \u00e9s a backend k\u00f6z\u00f6tt (p\u00e9ld\u00e1ul lehet\u0151s\u00e9g van rosszindulat\u00fa JavaScript-k\u00f3d beilleszt\u00e9s\u00e9re egy m\u00e1sik felhaszn\u00e1l\u00f3 munkamenet\u00e9be). A r\u00e9szleteket k\u00e9s\u0151bb ismertetj\u00fck, jelenleg annyit tudni, hogy a probl\u00e9ma a HTTP-fejl\u00e9c neve \u00e9s a kett\u0151spont k\u00f6z\u00f6tti sz\u00f3k\u00f6z\u00f6k helytelen kezel\u00e9s\u00e9b\u0151l, valamint a kocsivisszat\u00e9r\u00edt\u00e9si \u00e9s sort\u00f6r\u00e9si karakterek elt\u00e9r\u0151 kezel\u00e9s\u00e9b\u0151l ad\u00f3dik a k\u00e9r\u00e9s t\u00f6rzs\u00e9nek darabonk\u00e9nti tov\u00e1bb\u00edt\u00e1sa sor\u00e1n haszn\u00e1lt param\u00e9terblokkban, &#171;chunked&#187; \u00fczemm\u00f3dban.        <\/p>\n<p>Ne feledj\u00fck, hogy a Node.js platformot nemcsak Web-alkalmaz\u00e1sok szerveroldali m\u0171k\u00f6dtet\u00e9s\u00e9re, hanem hagyom\u00e1nyos \u00fcgyf\u00e9l- \u00e9s szerveroldali h\u00e1l\u00f3zati programok k\u00e9sz\u00edt\u00e9s\u00e9re is haszn\u00e1lj\u00e1k. A Node.js alkalmaz\u00e1sok funkcionalit\u00e1s\u00e1nak b\u0151v\u00edt\u00e9s\u00e9re egy nagy modulgy\u0171jtem\u00e9ny \u00e1ll rendelkez\u00e9sre, amely tartalmazza a megval\u00f3s\u00edt\u00e1s\u00fa modulokat.  <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hu\/server\/\"   title=\"szerverek\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1614\">szerverek<\/a> \u00e9s HTTP, SMTP, XMPP, DNS, FTP, IMAP, POP3 klienseket, valamint modulokat k\u00fcl\u00f6nb\u00f6z\u0151 webkeretrendszerek integr\u00e1l\u00e1s\u00e1hoz, WebSocket \u00e9s Ajax kezel\u0151ket, az adatb\u00e1zisokhoz (MySQL, PostgreSQL, SQLite, MongoDB) val\u00f3 kapcsol\u00f3d\u00e1sokat, sablongener\u00e1torokat, CSS-motorokat, kriptogr\u00e1fiai algoritmusok \u00e9s hiteles\u00edt\u00e9si rendszerek (OAuth) megval\u00f3s\u00edt\u00e1sait, XML-parsereket.    <\/p>\n<p> A sz\u00e1mos p\u00e1rhuzamos k\u00e9r\u00e9s feldolgoz\u00e1s\u00e1nak biztos\u00edt\u00e1sa \u00e9rdek\u00e9ben a Node.js aszinkron k\u00f3dv\u00e9grehajt\u00e1si modellt haszn\u00e1l, amely esem\u00e9nyek alapj\u00e1n m\u0171k\u00f6dik, blokkol\u00e1smentes \u00fczemm\u00f3dban, \u00e9s callback kezel\u0151k defini\u00e1l\u00e1s\u00e1val. A kapcsolatok multiplexel\u00e9s\u00e9re olyan m\u00f3dszerek \u00e1llnak rendelkez\u00e9sre, mint az epoll, kqueue, \/dev\/poll \u00e9s select. A kapcsolatok multiplexel\u00e9s\u00e9re a libuv k\u00f6nyvt\u00e1rat haszn\u00e1lj\u00e1k, amely a libev f\u00f6l\u00e9 \u00e9p\u00fcl Unix rendszerekben \u00e9s az IOCP-t a Windows rendszerekben. A sz\u00e1lmedence (thread pool) l\u00e9trehoz\u00e1s\u00e1hoz a libeio k\u00f6nyvt\u00e1rat haszn\u00e1lj\u00e1k, m\u00edg a blokkol\u00e1smentes DNS-k\u00e9r\u00e9sek v\u00e9grehajt\u00e1s\u00e1hoz a c-ares integr\u00e1lva van. Minden blokkol\u00e1sos rendszersz\u00f3 h\u00edv\u00e1s a sz\u00e1lmedenc\u00e9n bel\u00fcl hajt\u00f3dik v\u00e9gre, \u00e9s a jelek kezel\u0151ihez hasonl\u00f3an az eredm\u00e9ny\u00fcket egy n\u00e9vtelen cs\u00f6v\u00f6n (pipe) kereszt\u00fcl adj\u00e1k vissza. A JavaScript-k\u00f3d v\u00e9grehajt\u00e1s\u00e1t a Google \u00e1ltal kifejlesztett V8 motor ig\u00e9nybev\u00e9tel\u00e9vel biztos\u00edtj\u00e1k (tov\u00e1bb\u00e1 a Microsoft kifejleszti a Node.js egy v\u00e1ltozat\u00e1t a Chakra-Core motorral).        <\/p>\n<p>A Node.js l\u00e9nyeg\u00e9ben hasonl\u00f3 a Perl AnyEvent, Ruby Event Machine, Python Twisted keretrendszerekhez, valamint a Tcl esem\u00e9nykezel\u00e9s\u00e9hez, de a Node.js event loop-ja rejtve van a fejleszt\u0151k el\u0151l, \u00e9s hasonl\u00edt a b\u00f6ng\u00e9sz\u0151ben fut\u00f3 webalkalmaz\u00e1sok esem\u00e9nykezel\u00e9s\u00e9re. Node.js alkalmaz\u00e1sok \u00edr\u00e1sakor figyelembe kell venni az esem\u00e9nyorient\u00e1lt programoz\u00e1s saj\u00e1toss\u00e1gait; p\u00e9ld\u00e1ul ahelyett, hogy a &#171;var result = db.query(&#171;select..&#187;);&#187; k\u00f3dot v\u00e1rakoztatva futtassuk \u00e9s k\u00e9s\u0151bb dolgozzuk fel az eredm\u00e9nyeket, a Node.js aszinkron v\u00e9grehajt\u00e1si elvet alkalmaz, azaz a k\u00f3d &#171;db.query(&#171;select..&#187;, function (result) {eredm\u00e9ny feldolgoz\u00e1sa});&#187; form\u00e1ban alakul, \u00edgy a vez\u00e9rl\u00e9s azonnal \u00e1tad\u00f3dik a tov\u00e1bbi k\u00f3dnak, m\u00edg az eredm\u00e9ny a be\u00e9rkez\u0151 adatok alapj\u00e1n lesz feldolgozva.<br \/>\n<br \/>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=55997\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0421\u043e\u0441\u0442\u043e\u044f\u043b\u0441\u044f \u0440\u0435\u043b\u0438\u0437 Node.js 17.0, \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u044b \u0434\u043b\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 JavaScript. 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