{"id":81559,"date":"2020-05-14T19:42:16","date_gmt":"2020-05-14T17:42:16","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/avtor-node-js-predstavil-zashhishhyonnuyu-javascript-platformu-deno-1-0"},"modified":"2020-05-14T19:42:16","modified_gmt":"2020-05-14T17:42:16","slug":"avtor-node-js-predstavil-zashhishhyonnuyu-javascript-platformu-deno-1-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/avtor-node-js-predstavil-zashhishhyonnuyu-javascript-platformu-deno-1-0","title":{"rendered":"Autor Node.js predstavil zabezpe\u010den\u00fa JavaScript platformu Deno 1.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Po dvoch rokoch v\u00fdvoja <noindex><a rel=\"nofollow\" href=\"https:\/\/deno.land\/v1\">predstaven\u00e9<\/a><\/noindex> prv\u00fd v\u00fdznamn\u00fd vydanie <noindex><a rel=\"nofollow\" href=\"https:\/\/deno.land\/\">Deno 1.0<\/a><\/noindex>, platforma pre izolovan\u00e9 sp\u00fa\u0161\u0165anie aplik\u00e1ci\u00ed nap\u00edsan\u00fdch v JavaScripte a TypeScripte, ktor\u00e1 m\u00f4\u017ee by\u0165 vyu\u017eit\u00e1 na vytv\u00e1ranie serverov\u00fdch spracovate\u013eov. Platformu vyv\u00edja Ryan Dahl (<noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Ryan_Dahl\">Ryan Dahl<\/a><\/noindex>), tvorca Node.js. Tak ako v Node.js, Deno pou\u017e\u00edva JavaScriptov\u00fd engine <noindex><a rel=\"nofollow\" href=\"https:\/\/v8.dev\/\">V8<\/a><\/noindex>, ktor\u00fd sa taktie\u017e pou\u017e\u00edva v prehliada\u010doch zalo\u017een\u00fdch na Chromiu. Deno v\u0161ak nie je odno\u017eou Node.js, ale predstavuje \u00faplne nov\u00fd projekt vytvoren\u00fd od z\u00e1kladov. K\u00f3d projektu <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/denoland\/deno\">distribuovan\u00fd<\/a><\/noindex> je pod licenciou MIT. Sestavy <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/denoland\/deno\/releases\/tag\/v1.0.0\">s\u00fa pripraven\u00e9<\/a><\/noindex> pre Linux, Windows a macOS.<\/p>\n<p>D\u00f4le\u017eit\u00e9 \u010d\u00edslo verzie s\u00favis\u00ed so stabiliz\u00e1ciou API v mennom priestore Deno, ktor\u00fd zodpoved\u00e1 za interakciu aplik\u00e1ci\u00ed s OS. Programov\u00e9 rozhrania, ktor\u00e9 zatia\u013e <noindex><a rel=\"nofollow\" href=\"https:\/\/doc.deno.land\/https\/raw.githubusercontent.com\/denoland\/deno\/master\/cli\/js\/lib.deno.unstable.d.ts\">nie s\u00fa stabilizovan\u00e9<\/a><\/noindex>, s\u00fa predvolene skryt\u00e9 a s\u00fa dostupn\u00e9 len pri spusten\u00ed v re\u017eime &#171;&#8212;unstable&#187;. S tvorbou nov\u00fdch verzi\u00ed sa tak\u00e9to API postupne presunie do stabilnej\u0161ej kateg\u00f3rie. API v glob\u00e1lnom priestore mien, ktor\u00e9 obsahuje tak\u00e9 be\u017en\u00e9 funkcie ako setTimeout() a fetch(), je v maxim\u00e1lnej miere prisp\u00f4soben\u00e9 API be\u017en\u00fdch webov\u00fdch prehliada\u010dov a vyv\u00edja sa v s\u00falade s webov\u00fdmi \u0161tandardmi pre prehliada\u010de. Poskytovan\u00e9 Rust API, ktor\u00e9 sa pou\u017e\u00edva priamo v k\u00f3de platformy, ako aj rozhranie na v\u00fdvoj pluginov pre Deno runtime, zatia\u013e nie s\u00fa stabilizovan\u00e9 a pokra\u010duj\u00fa vo v\u00fdvoji.<\/p>\n<p>K\u013e\u00fa\u010dov\u00fdmi mot\u00edvmi vytvorenia novej JavaScriptovej platformy bolo odstr\u00e1nenie konceptu\u00e1lnych ch\u00fdb, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.youtube.com\/watch?v=M3BM9TB-8yA\">ktor\u00e9 boli<\/a><\/noindex> dovolen\u00e9 <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/tokio-rs\/tokio\">v architekt\u00fare Node.js a poskytn\u00fa\u0165 pou\u017e\u00edvate\u013eom bezpe\u010dnej\u0161ie prostredie. Pre zv\u00fd\u0161enie bezpe\u010dnosti je obal okolo engine V8 nap\u00edsan\u00fd v jazyku Rust, ktor\u00fd umo\u017e\u0148uje vyhn\u00fa\u0165 sa mnoh\u00fdm zranite\u013enostiam vznikaj\u00facim z n\u00edzko\u00farov\u0148ovej pr\u00e1ce s pam\u00e4\u0165ou, ako je pr\u00edstup k pam\u00e4\u0165ovej oblasti po jej uvo\u013enen\u00ed, dereferencovanie nulov\u00fdch ukazovate\u013eov a prekro\u010denie medzier v pam\u00e4ti. Na spracovanie po\u017eiadaviek v neblokuj\u00facom re\u017eime sa pou\u017e\u00edva platforma<\/a><\/noindex>Tokio<\/p>\n<p>Hlavn\u00e9 <noindex><a rel=\"nofollow\" href=\"https:\/\/deno.land\/manual\">, taktie\u017e nap\u00edsan\u00e1 v jazyku Rust. Tokio umo\u017e\u0148uje vytv\u00e1ra\u0165 vysoko v\u00fdkonn\u00e9 aplik\u00e1cie na b\u00e1ze eventovo orientovanej architekt\u00fary (Event-driven), podporuj\u00face multithreading a spracovanie sie\u0165ov\u00fdch po\u017eiadaviek v asynchr\u00f3nnom re\u017eime.<\/a><\/noindex> vlastnosti\n<\/p>\n<ul>\n<li class=\"l\"> Orient\u00e1cia na bezpe\u010dnos\u0165 v predvolenej konfigur\u00e1cii. Pr\u00edstup k s\u00faborom, sie\u0165ov\u00fdm funkci\u00e1m a k premenn\u00fdm prostredia je predvolene zablokovan\u00fd a vy\u017eaduje explicitn\u00e9 povolenie. Aplik\u00e1cie sa predvolene sp\u00fa\u0161\u0165aj\u00fa v izolovan\u00fdch sandboxov\u00fdch prostrediach a nem\u00f4\u017eu z\u00edska\u0165 pr\u00edstup k syst\u00e9mov\u00fdm funkci\u00e1m bez poskytnutia explicitn\u00fdch opr\u00e1vnen\u00ed;\n<\/li>\n<li class=\"l\"> Integrovan\u00e1 podpora jazyka TypeScript ved\u013ea JavaScriptu. Na kontrolu typov a gener\u00e1ciu JavaScriptu sa vyu\u017e\u00edva \u0161tandardn\u00fd kompil\u00e1tor TypeScript, \u010do sp\u00f4sobuje pokles v\u00fdkonu v porovnan\u00ed s anal\u00fdzou JavaScriptu v V8. V bud\u00facnosti sa pl\u00e1nuje pripravi\u0165 vlastn\u00e1 implement\u00e1cia syst\u00e9mu kontroly typov TypeScript, ktor\u00e1 v\u00fdrazne zv\u00fd\u0161i v\u00fdkon spracovania TypeScript;\n<\/li>\n<li class=\"l\"> Runtime sa dod\u00e1va vo forme jedn\u00e9ho samostatn\u00e9ho spustite\u013en\u00e9ho s\u00faboru (&#171;deno&#187;). Na spustenie aplik\u00e1ci\u00ed pomocou Deno sta\u010d\u00ed <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/denoland\/deno\/releases\">stiahnu\u0165<\/a><\/noindex> pre svoju platformu jeden spustite\u013en\u00fd s\u00fabor s ve\u013ekos\u0165ou okolo 20 MB, ktor\u00fd nem\u00e1 vonkaj\u0161ie z\u00e1vislosti a nevy\u017eaduje \u017eiadnu \u0161peci\u00e1lnu in\u0161tal\u00e1ciu do syst\u00e9mu. Pri tom deno nie je monolitn\u00e1 aplik\u00e1cia, ale predstavuje kolekciu crate bal\u00edkov na Rust (<noindex><a rel=\"nofollow\" href=\"https:\/\/crates.io\/crates\/deno_core\">deno_core<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/crates.io\/crates\/rusty_v8\">rusty_v8<\/a><\/noindex>), ktor\u00e9 m\u00f4\u017eu by\u0165 pou\u017e\u00edvan\u00e9 samostatne;\n<\/li>\n<li class=\"l\"> Pri spusten\u00ed programu, ako aj na na\u010d\u00edtanie modulov je mo\u017en\u00e9 pou\u017e\u00edva\u0165 adresovanie cez URL. Napr\u00edklad na spustenie programu welcome.js m\u00f4\u017eete pou\u017ei\u0165 pr\u00edkaz \u201edeno https:\/\/deno.land\/std\/examples\/welcome.js\u201c. K\u00f3d z extern\u00fdch zdrojov sa na\u010d\u00edtava a cacheuje na lok\u00e1lnom syst\u00e9me, av\u0161ak nikdy sa automaticky neaktualizuje (na aktualiz\u00e1ciu je potrebn\u00e9 explicitne spusti\u0165 aplik\u00e1ciu s flagom \u201e--reload\u201c);\n<\/li>\n<li class=\"l\"> Efekt\u00edvne spracovanie sie\u0165ov\u00fdch po\u017eiadaviek cez HTTP, platforma je ur\u010den\u00e1 na vytv\u00e1ranie vysokov\u00fdkonn\u00fdch sie\u0165ov\u00fdch aplik\u00e1ci\u00ed;\n<\/li>\n<li class=\"l\"> Mo\u017enos\u0165 vytv\u00e1rania univerz\u00e1lnych webov\u00fdch aplik\u00e1ci\u00ed, ktor\u00e9 m\u00f4\u017eu fungova\u0165 ako v Deno, tak aj v be\u017enom webovom prehliada\u010di;\n<li class=\"l\"> Pr\u00edtomnos\u0165 <noindex><a rel=\"nofollow\" href=\"https:\/\/deno.land\/std\">\u0161tandardn\u00e9ho s\u00faboru modulov<\/a><\/noindex>, ktor\u00fdch pou\u017eitie nevy\u017eaduje viazanie na vonkaj\u0161ie z\u00e1vislosti. Moduly zo \u0161tandardnej zbierky pre\u0161li dodato\u010dn\u00fdm auditom a kontrolou kompatibility;\n<\/li>\n<li class=\"l\"> Okrem runtime platforma Deno zohr\u00e1va aj \u00falohu bal\u00edkov\u00e9ho mana\u017e\u00e9ra a umo\u017e\u0148uje v r\u00e1mci k\u00f3du odkazova\u0165 na moduly pomocou URL. Napr\u00edklad na na\u010d\u00edtanie modulu m\u00f4\u017ee\u0161 v k\u00f3de uvies\u0165 &#171;import * as log from &#171;https:\/\/deno.land\/std\/log\/mod.ts&#187;. S\u00fabory na\u010d\u00edtan\u00e9 z extern\u00fdch serverov pomocou URL s\u00fa cacheovan\u00e9. Prira\u010fovanie k verzi\u00e1m modulov sa ur\u010duje prostredn\u00edctvom \u0161pecifik\u00e1cie \u010d\u00edsel verzi\u00ed v URL, napr\u00edklad &#171;https:\/\/unpkg.com\/liltest@0.0.5\/dist\/liltest.js&#187;;\n<\/li>\n<li class=\"l\"> S\u00fa\u010das\u0165ou je integrovan\u00fd syst\u00e9m na kontrolu z\u00e1vislost\u00ed (pr\u00edkaz \u201edeno info\u201c) a n\u00e1stroj na form\u00e1tovanie k\u00f3du (deno fmt);\n<\/li>\n<li class=\"l\"> V\u0161etky skripty aplik\u00e1cie m\u00f4\u017eu by\u0165 zdru\u017een\u00e9 do jedn\u00e9ho s\u00faboru JavaScript.\n<\/li>\n<\/ul>\n<p> Rozdiely od Node.js:\n<\/p>\n<ul>\n<li class=\"l\"> Deno nepou\u017e\u00edva spr\u00e1vcu bal\u00edkov npm<br \/>\n a nezviazuje sa na repozit\u00e1re, adresovanie modulov sa realizuje cez URL alebo pod\u013ea s\u00faborov\u00e9ho umiestnenia a samotn\u00e9 moduly m\u00f4\u017eu by\u0165 umiestnen\u00e9 na akejko\u013evek webovej str\u00e1nke;\n<\/li>\n<li class=\"l\"> V Deno sa nepou\u017e\u00edva &#171;package.json&#187; na definovanie modulov;\n<\/li>\n<li class=\"l\"> Rozdiel API, v\u0161etky asynchr\u00f3nne akcie v Deno vracaj\u00fa promise;\n<\/li>\n<li class=\"l\"> Deno vy\u017eaduje explicitn\u00e9 definovanie v\u0161etk\u00fdch potrebn\u00fdch opr\u00e1vnen\u00ed pre s\u00fabory, sie\u0165 a premenn\u00e9 prostredia;\n<\/li>\n<li class=\"l\"> V\u0161etky chyby, ktor\u00e9 nie s\u00fa vybaven\u00e9 spracovate\u013emi, ved\u00fa k ukon\u010deniu vykon\u00e1vania aplik\u00e1cie;\n<\/li>\n<li class=\"l\"> V Deno sa pou\u017e\u00edva syst\u00e9m modulov ECMAScript a nepodporuje sa require();\n<li class=\"l\"> Vstavan\u00fd HTTP server Deno je nap\u00edsan\u00fd v TypeScript a funguje na nat\u00edvnych TCP soketoch, zatia\u013e \u010do HTTP server Node.js je nap\u00edsan\u00fd v C a poskytuje v\u00e4zby pre JavaScript. V\u00fdvoj\u00e1ri Deno sa zamerali na optimaliz\u00e1ciu cel\u00e9ho TCP soketov\u00e9ho vrstvy a poskytovanie v\u0161eobecnej\u0161ieho rozhrania. HTTP server Deno zabezpe\u010duje ni\u017e\u0161iu priepustnos\u0165, ale garantuje predv\u00eddate\u013ene n\u00edzke oneskorenia. Napr\u00edklad v teste jednoduch\u00e1 aplik\u00e1cia zalo\u017een\u00e1 na Deno HTTP serveri dok\u00e1zala spracova\u0165 25 tis\u00edc po\u017eiadaviek za sekundu s maxim\u00e1lnym oneskoren\u00edm 1,3 milisekundy. V Node.js podobn\u00e1 aplik\u00e1cia spracovala 34 tis\u00edc po\u017eiadaviek za sekundu, ale oneskorenia sa pohybovali od 2 do 300 milisek\u00fand.\n<li class=\"l\"> Deno nie je kompatibiln\u00fd s bal\u00edkmi pre Node.js (NPM), ale vyv\u00edja sa samostatne. <noindex><a rel=\"nofollow\" href=\"https:\/\/deno.land\/std\/node\/\">vrstva<\/a><\/noindex> pre kompatibilitu so \u0161tandardnou kni\u017enicou Node.js, pri\u010dom s rozvojom Deno sa v \u0148om bude m\u00f4c\u0165 sp\u00fa\u0161\u0165a\u0165 \u010doraz viac aplik\u00e1ci\u00ed nap\u00edsan\u00fdch pre Node.js.\n<\/li>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Zdroj: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52947\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u0441\u043b\u0435 \u0434\u0432\u0443\u0445 \u043b\u0435\u0442 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u043f\u0435\u0440\u0432\u044b\u0439 \u0437\u043d\u0430\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0439 \u0432\u044b\u043f\u0443\u0441\u043a Deno 1.0, \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u044b \u0434\u043b\u044f \u043e\u0431\u043e\u0441\u043e\u0431\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u043d\u0430 \u044f\u0437\u044b\u043a\u0430\u0445 JavaScript \u0438 TypeScript, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0430 \u0434\u043b\u044f \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432, \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0449\u0438\u0445 \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440\u0435. \u041f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u0443 \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u0442 \u0420\u0430\u0439\u0430\u043d \u0414\u0430\u043b\u044c (Ryan Dahl), \u0441\u043e\u0437\u0434\u0430\u0442\u0435\u043b\u044c Node.js. \u041a\u0430\u043a \u0438 \u0432 Node.js \u0432 Deno \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f JavaScript-\u0434\u0432\u0438\u0436\u043e\u043a V8, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0442\u0430\u043a\u0436\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f \u0432 \u0431\u0440\u0430\u0443\u0437\u0435\u0440\u0430\u0445 \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 Chromium. [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-81559","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041f\u043e\u0441\u043b\u0435 \u0434\u0432\u0443\u0445 \u043b\u0435\u0442 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u043f\u0435\u0440\u0432\u044b\u0439 \u0437\u043d\u0430\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0439 \u0432\u044b\u043f\u0443\u0441\u043a Deno 1.0.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link 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