{"id":102272,"date":"2021-11-12T09:36:39","date_gmt":"2021-11-12T07:36:39","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/web-frejmvork-pusa-perenosyashhij-logiku-javascript-frontenda-na-storonu-servera"},"modified":"2021-11-12T09:36:39","modified_gmt":"2021-11-12T07:36:39","slug":"web-frejmvork-pusa-perenosyashhij-logiku-javascript-frontenda-na-storonu-servera","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/web-frejmvork-pusa-perenosyashhij-logiku-javascript-frontenda-na-storonu-servera","title":{"rendered":"Webowy framework Pusa, przenosz\u0105cy logik\u0119 front-endu JavaScript na stron\u0119 serwera","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Opublikowano framework webowy Pusa z implementacj\u0105 koncepcji, kt\u00f3ra przenosi logik\u0119 front-endu, realizowan\u0105 w przegl\u0105darce za pomoc\u0105 JavaScript, na stron\u0119 back-endu \u2014 zarz\u0105dzanie przegl\u0105dark\u0105 i elementami DOM, a tak\u017ce logika biznesowa s\u0105 realizowane na back-endzie. Kod JavaScript wykonywany w przegl\u0105darce jest zast\u0119powany uniwersaln\u0105 warstw\u0105, kt\u00f3ra wywo\u0142uje odpowiednie procedury na stronie back-endu. Nie ma potrzeby rozwijania front-endu z u\u017cyciem JavaScript. Referencyjna realizacja Pusa napisana jest w j\u0119zyku PHP i rozprowadzana na licencji GPLv3. Opr\u00f3cz PHP technologia mo\u017ce by\u0107 implementowana w ka\u017cdym innym j\u0119zyku, w tym JavaScript\/Node.js, Java, Python, Go i Ruby. <\/p>\n

Pusa definiuje protok\u00f3\u0142 wymiany oparty na minimalistycznym zestawie polece\u0144. Podczas \u0142adowania strony przegl\u0105darka \u0142adowa\u0142a podstawow\u0105 zawarto\u015b\u0107 DOM oraz rdze\u0144 JavaScript Pusa-Front. Pusa-Front, za pomoc\u0105 zapyta\u0144 Ajax, przesy\u0142a zdarzenia przegl\u0105darki (takie jak klikni\u0119cie, utrataostro\u015bci, skupienie i naci\u015bni\u0119cie klawisza) oraz parametry zapytania (element, kt\u00f3ry wywo\u0142a\u0142 zdarzenie, jego atrybuty, URL itd.) do serwerowego obs\u0142ugiwacza Pusa-Back. Na podstawie otrzymanych danych Pusa-Back okre\u015bla kontroler, wykonuje \u0142adunek u\u017cyteczny i formu\u0142uje odpowied\u017a zestawu polece\u0144. Po otrzymaniu odpowiedzi z zapytania Pusa-Front wykonuje polecenia, zmieniaj\u0105c zawarto\u015b\u0107 DOM i otoczenie przegl\u0105darki. <\/p>\n

Stan frontendu jest kszta\u0142towany, ale nie kontrolowany przez backend, co sprawia, \u017ce rozw\u00f3j dla Pusa jest podobny do kodu dla karty graficznej lub Canvas, gdzie wynik wykonania nie jest kontrolowany przez programist\u0119. Aby tworzy\u0107 interaktywne aplikacje oparte na Canvas i onmousemove, przewidziano mo\u017cliwo\u015b\u0107 \u0142adowania i u\u017cywania dodatkowych skrypt\u00f3w JavaScript po stronie klienta. W\u015br\u00f3d wad metody zauwa\u017ca si\u0119 r\u00f3wnie\u017c przeniesienie cz\u0119\u015bci obci\u0105\u017cenia z frontendu na backend oraz zwi\u0119kszenie cz\u0119stotliwo\u015bci wymiany danych z. serwerem<\/a>. <\/p>\n

Do zalet nale\u017cy: wyeliminowanie potrzeby anga\u017cowania programist\u00f3w JavaScript frontendowych, stabilny i kompaktowy kod po stronie klienta (11 kB), niedost\u0119pno\u015b\u0107 g\u0142\u00f3wnego kodu po stronie frontendu, brak potrzeby serializacji REST oraz narz\u0119dzi typu gRPC, a tak\u017ce wyeliminowanie problem\u00f3w z uzgadnianiem routingu zapyta\u0144 mi\u0119dzy frontendem a backendem.
\n
\u0179r\u00f3d\u0142o: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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