{"id":80224,"date":"2020-05-04T13:42:20","date_gmt":"2020-05-04T11:42:20","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/storacle-deczentralizovannoe-hranilishhe-fajlov"},"modified":"2020-05-04T13:42:20","modified_gmt":"2020-05-04T11:42:20","slug":"storacle-deczentralizovannoe-hranilishhe-fajlov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/administrirovanie\/storacle-deczentralizovannoe-hranilishhe-fajlov","title":{"rendered":"Storacle \u2014 decentralizirana pohrana datoteka","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Storacle \u2014 decentralizirana pohrana datoteka\" src=\"\/wp-content\/uploads\/2020\/05\/333f7b998e00ce32367d97f7ccd05bef.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Prije nego \u0161to zapo\u010dnem, moram ostaviti <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/495058\/\">link na prethodni \u010dlanak<\/a><\/noindex>, kako bi bilo jasno o \u010demu se zapravo radi.<\/p>\n<p><\/p>\n<p>U ovom \u010dlanku bih \u017eelio obraditi sloj koji je odgovoran za pohranu datoteka i kako to mo\u017ee iskoristiti bilo koja osoba. <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/ortexx\/storacle\/\">Storacle \u2014 samostalna biblioteka<\/a><\/noindex>, nema direktne veze s muzikom. Mo\u017ee se organizirati pohrana bilo kojih datoteka.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>U prethodnom \u010dlanku sam malo \"prikazao\" <strong>ipfs<\/strong>, ali to se dogodilo upravo u kontekstu problema koji sam rje\u0161avao. U na\u010delu, smatram ovaj projekt sjajnim. Samo mi vi\u0161e odgovara mogu\u0107nost stvaranja razli\u010ditih mre\u017ea za razli\u010dite zadatke. To omogu\u0107ava bolju organizaciju strukture i smanjenje optere\u0107enja na pojedinim \u010dvorovima i mre\u017ei u cjelini. \u010cak se i unutar jednog odre\u0111enog projekta, ako je potrebno, mo\u017ee razbiti mre\u017ea na dijelove prema nekim kriterijima, smanjuju\u0107i ukupno optere\u0107enje.<\/p>\n<p><\/p>\n<p>Dakle, storacle koristi mehanizam <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/ortexx\/spreadable\">spreadable<\/a><\/noindex> za organizaciju mre\u017ee. Glavne karakteristike:<\/p>\n<p><\/p>\n<ul>\n<li>Datoteke se mogu dodavati u skladi\u0161te putem bilo kojeg \u010dvora.<\/li>\n<li>Datoteke se \u010duvaju u cijelini, ne blokovima.<\/li>\n<li>Svaka datoteka ima svoj jedinstveni hash prema sadr\u017eaju za daljnji rad s njom.<\/li>\n<li>Datoteke se mogu duplicirati radi ve\u0107e pouzdanosti<\/li>\n<li>Broj datoteka na jednom \u010dvoru ograni\u010den je samo datote\u010dnim sustavom (ima iznimaka, o tome \u0107e biti rije\u010di kasnije)<\/li>\n<li>Broj datoteka u mre\u017ei ograni\u010den je mogu\u0107nostima spreadable po broju dopu\u0161tenih \u010dvorova u mre\u017ei, koji \u0107e u drugoj verziji mo\u0107i raditi s beskrajnim brojem \u010dvorova (o tome u drugom \u010dlanku)<\/li>\n<\/ul>\n<p><\/p>\n<p>Jednostavan primjer kako to zapravo funkcionira iz programa:<\/p>\n<p><\/p>\n<p>Server:<\/p>\n<p><\/p>\n<pre><code class=\"javascript\">const Node = require('storacle').Node;\n\n(async () =&gt; {\n  try {\n    const node = new Node({\n      port: 4000,\n      hostname: 'localhost'\n    });\n    await node.init();\n  }\n  catch(err) {\n    console.error(err.stack);\n    process.exit(1);\n  }\n})();<\/code><\/pre>\n<p><\/p>\n<p>Klijent:<\/p>\n<p><\/p>\n<pre><code class=\"javascript\">const Client = require('storacle').Client;\n\n(async () =&gt; {\n  try {\n    const client = new Client({\n      address: 'localhost:4000'\n    });\n    await client.init();\n    const hash = await client.storeFile('.\/my-file');\n    const link = await client.getFileLink(hash);\n    await client.removeFile(hash);\n  }\n  catch(err) {\n    console.error(err.stack);\n    process.exit(1);\n  }\n})();<\/code><\/pre>\n<p><\/p>\n<p><strong>Pogled iznutra<\/strong><\/p>\n<p><\/p>\n<p>Iza kulisa nema ni\u0161ta natprirodno. Informacije o broju datoteka, njihovoj ukupnoj veli\u010dini i drugim detaljima pohranjuju se u in-memory bazi i a\u017euriraju se prilikom brisanja i dodavanja datoteka, stoga nema potrebe \u010desto pristupati datote\u010dnom sustavu. Iznimka je uklju\u010divanje sakuplja\u010da sme\u0107a, kada je potrebna cirkulacija datoteka prilikom postizanja odre\u0111enih veli\u010dina pohrane, a ne zabrana dodavanja novih. U tom slu\u010daju potrebno je obi\u0107i pohranu, a rad s velikim brojem datoteka (&gt; milijun recimo) mo\u017ee uzrokovati zna\u010dajne optere\u0107enja. Bolje je imati manje datoteka i pokrenuti vi\u0161e \u010dvorova. Ako je \"\u010dista\u010d\" isklju\u010den, tada tog problema nema.<\/p>\n<p><\/p>\n<p>Pohrana datoteka se sastoji od 256 mapa i 2 razine ugnije\u017e\u0111enja. Datoteke se nalaze u mapama druge razine. To zna\u010di da, s 1 milijunom datoteka, svaka takva mapa ima oko 62500 datoteka (1000000 \/ sqrt(256)).<\/p>\n<p><\/p>\n<p>Nazivi mapa formiraju se iz hash-a datoteka, kako bi se moglo brzo pristupiti kada se zna hash.<\/p>\n<p><\/p>\n<p>Takva struktura je odabrana na temelju velikog broja razli\u010ditih zahtjeva za pohranu: podr\u0161ka za slabe datote\u010dne sustave, gdje nije po\u017eeljno imati puno datoteka u jednoj mapi, brzo obilazak svih mapa kada je potrebno, itd. Neka zlatna sredina.<\/p>\n<p><\/p>\n<p><strong>Ke\u0161iranje<\/strong><\/p>\n<p><\/p>\n<p>Prilikom dodavanja datoteka, kao i prilikom njihovog preuzimanja, u ke\u0161 se zapisuje poveznice na datoteke.<br \/>\nZahvaljuju\u0107i tome, vrlo \u010desto nema potrebe prelaziti cijelu mre\u017eu u potrazi za datotekom. To ubrzava dobivanje poveznica i smanjuje optere\u0107enje na mre\u017ei. Tako\u0111er, ke\u0161iranje se doga\u0111a putem http zaglavlja.<\/p>\n<p><\/p>\n<p><strong>Izomorfizam<\/strong><\/p>\n<p><\/p>\n<p>Klijent je napisan na JavaScript-u i izomorfan je, mo\u017ee se koristiti direktno iz preglednika.\u00a0<br \/>\nMo\u017eete u\u010ditati datoteku <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/ortexx\/storacle\/blob\/master\/dist\/storacle.client.js\">https:\/\/github.com\/ortexx\/storacle\/blob\/master\/dist\/storacle.client.js<\/a><\/noindex> kao skriptu i dobiti pristup <strong>window.ClientStoracle <\/strong>ili je uvesti kroz sustav gradnje itd.<\/p>\n<p><\/p>\n<p><strong>Odlo\u017eene poveznice<\/strong><\/p>\n<p><\/p>\n<p>Zanimljiva funkcija je tako\u0111er \"odlo\u017eena veza\". To je veza na datoteku koju mo\u017eete dobiti sinkrono, ovdje i sada, dok \u0107e se datoteka povu\u0107i kada ve\u0107 bude prona\u0111ena u pohrani. To je vrlo prakti\u010dno kada, na primjer, trebate prikazati neke slike na web stranici. Jednostavno postavite odlo\u017eenu vezu u src i to je to. Mnoge primjere mo\u017eete izmisliti.<\/p>\n<p><\/p>\n<p><strong>Api klijent<\/strong><\/p>\n<p><\/p>\n<ul>\n<li>(196 tisu\u0107a redaka koda, 11 autora, 7 commitera, 11 neodgovorenih problema); <strong>Client.prototype.storeFile()<\/strong> \u2014 spremanje datoteke<\/li>\n<li>(196 tisu\u0107a redaka koda, 11 autora, 7 commitera, 11 neodgovorenih problema); <strong>Client.prototype.getFileLink()<\/strong> \u2014 dobivanje izravne poveznice na datoteku<\/li>\n<li>(196 tisu\u0107a redaka koda, 11 autora, 7 commitera, 11 neodgovorenih problema); <strong>Client.prototype.getFileLinks()<\/strong> \u2014 dobivanje popisa izravnih poveznica na datoteku sa svih \u010dvorova na kojima postoji<\/li>\n<li>(196 tisu\u0107a redaka koda, 11 autora, 7 commitera, 11 neodgovorenih problema); <strong>Client.prototype.getFileToBuffer()<\/strong> \u2014 preuzeti datoteku u memorijski prostor<\/li>\n<li>(196 tisu\u0107a redaka koda, 11 autora, 7 commitera, 11 neodgovorenih problema); <strong>Client.prototype.getFileToPath()<\/strong> \u2014 preuzeti datoteku u datote\u010dni sustav<\/li>\n<li>(196 tisu\u0107a redaka koda, 11 autora, 7 commitera, 11 neodgovorenih problema); <strong>Client.prototype.getFileToBlob()<\/strong> \u2014 preuzeti datoteku u blob (za verziju preglednika)<\/li>\n<li>(196 tisu\u0107a redaka koda, 11 autora, 7 commitera, 11 neodgovorenih problema); <strong>Client.prototype.removeFile()<\/strong> \u2014 ukloni datoteku<\/li>\n<li><strong>Client.prototype.createRequestedFileLink()<\/strong> \u2014 stvoriti odgo\u0111enu poveznicu<\/li>\n<\/ul>\n<p><\/p>\n<p><strong>Izvoz datoteka na drugi server<\/strong><\/p>\n<p><\/p>\n<p>Da biste prenijeli datoteke na drugi \u010dvor, mo\u017eete:<\/p>\n<p><\/p>\n<ul>\n<li>Jednostavno kopirati cijelu mapu pohrane zajedno s postavkama. (u budu\u0107nosti to mo\u017eda ne\u0107e raditi)<\/li>\n<li>Kopirati samo mapu s datotekama. No, u tom slu\u010daju, potrebno je jednom pokrenuti funkciju <strong>node.normalizeFilesInfo()<\/strong>, kako bi se prera\u010dunali svi podaci i unijeli u bazu.<\/li>\n<li>Koristiti funkciju <strong>node.exportFiles()<\/strong>, koja zapo\u010dinje kopiranje datoteka.<\/li>\n<\/ul>\n<p><\/p>\n<p><strong>Osnovne postavke \u010dvora<\/strong><br \/>\nPokretanjem \u010dvora pohrane, mo\u017eete navesti sve potrebne postavke.<br \/>\nOpi\u0161em najosnovnije, ostalo mo\u017eete na\u0107i na GitHubu.<\/p>\n<p><\/p>\n<ul>\n<li><strong>storage.dataSize<\/strong> \u2014 veli\u010dina mape s datotekama<\/li>\n<li><strong>storage.tempSize<\/strong> \u2014 veli\u010dina privremene mape<\/li>\n<li><strong>storage.autoCleanSize<\/strong> \u2014 minimalna veli\u010dina pohrane koja se mora odr\u017eavati. Ako navedete ovu vrijednost, \u010dim prostor po\u010dne nedostajati, najneiskori\u0161tenije datoteke \u0107e biti izbrisane.<\/li>\n<li><strong>file.maxSize<\/strong> \u2014 maksimalna veli\u010dina datoteke<\/li>\n<li><strong>file.minSize<\/strong> \u2014 minimalna veli\u010dina datoteke<\/li>\n<li><strong>file.preferredDuplicates<\/strong> \u2014 preferirani broj duplicata datoteke u mre\u017ei<\/li>\n<li><strong>file.mimeWhitelist<\/strong> \u2014 prihvatljive vrste datoteka<\/li>\n<li><strong>file.mimeBlacklist<\/strong> \u2014 neprihvatljive vrste datoteka<\/li>\n<li><strong>file.extWhitelist<\/strong> \u2014 prihvatljive ekstenzije datoteka<\/li>\n<li><strong>file.extBlacklist<\/strong> \u2014 neprihvatljive ekstenzije datoteka<\/li>\n<li><strong>file.linkCache<\/strong> \u2014 razne postavke predmemoriranja poveznica<\/li>\n<\/ul>\n<p><\/p>\n<p>Gotovo svi parametri povezani s veli\u010dinama mogu se postaviti i u apsolutnim i u relativnim vrijednostima.<\/p>\n<p><\/p>\n<p><strong>Rad preko naredbenog retka<\/strong><br \/>\nBiblioteku mo\u017eete koristiti preko naredbenog retka. Za to je potrebno instalirati je globalno: <strong>npm i -g storacle<\/strong>. Nakon toga mo\u017eete pokretati potrebne akcije iz direktorija s projektom gdje se nalazi \u010dvor. Na primjer, <strong>storacle -a storeFile -f .\/file.txt -c .\/config.js<\/strong>, kako biste dodali datoteku. Sve akcije mo\u017eete prona\u0107i na <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/ortexx\/storacle\/blob\/master\/bin\/actions.js\">https:\/\/github.com\/ortexx\/storacle\/blob\/master\/bin\/actions.js<\/a><\/noindex><\/p>\n<p><\/p>\n<p><strong>Za\u0161to bi ti ovo moglo biti potrebno<\/strong><\/p>\n<p><\/p>\n<ul>\n<li>Ako \u017eeli\u0161 stvoriti neki decentralizirani projekt u kojem se planira pohranjivati i raditi s datotekama na prakti\u010dne na\u010dine. Na primjer, projekt s muzikom, opisan na linku na po\u010detku \u010dlanka, koristi <strong>storacle<\/strong>.<\/li>\n<li>Ako radite na bilo kojim drugim projektima gdje je potrebno distribuirano pohranjivanje datoteka. Mo\u017eete lako izgraditi svoju privatnu mre\u017eu, fleksibilno postavljati \u010dvorove i dodavati nove kada je to potrebno.<\/li>\n<li>Ako vam je samo potrebno negdje pohraniti datoteke svog web-mjesta i ne \u017eelite sve sami pisati. Ova biblioteka bi mogla bolje odgovarati va\u0161im potrebama.<\/li>\n<li>Ako imate projekt u kojem radite s datotekama, ali \u017eelite sve manipulacije izvr\u0161avati iz preglednika. Mo\u017eete izbje\u0107i pisanje serverskog koda.<\/li>\n<\/ul>\n<p><\/p>\n<p>Moji kontakti:<\/p>\n<p><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/t.me\/ortex\">@ortex<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"mailto:mywebstreet@gmail.com\">mywebstreet@gmail.com<\/a><\/noindex><\/li>\n<\/ul>\n<p>Izvor: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/499954\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0440\u0435\u0436\u0434\u0435 \u0447\u0435\u043c \u043d\u0430\u0447\u043d\u0443, \u0434\u043e\u043b\u0436\u0435\u043d \u043e\u0441\u0442\u0430\u0432\u0438\u0442\u044c \u0441\u0441\u044b\u043b\u043a\u0443 \u043d\u0430 \u043f\u0440\u0435\u0434\u044b\u0434\u0443\u0449\u0443\u044e \u0441\u0442\u0430\u0442\u044c\u044e, \u0447\u0442\u043e\u0431\u044b \u0431\u044b\u043b\u043e \u043f\u043e\u043d\u044f\u0442\u043d\u043e \u043e \u0447\u0435\u043c \u0438\u043c\u0435\u043d\u043d\u043e \u0440\u0435\u0447\u044c. \u0412 \u044d\u0442\u043e\u0439 \u0441\u0442\u0430\u0442\u044c\u0435 \u0445\u043e\u0442\u0435\u043b \u0431\u044b \u0440\u0430\u0437\u043e\u0431\u0440\u0430\u0442\u044c \u0441\u043b\u043e\u0439, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043e\u0442\u0432\u0435\u0447\u0430\u0435\u0442 \u0437\u0430 \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u0435 \u0444\u0430\u0439\u043b\u043e\u0432, \u0438 \u043a\u0430\u043a \u044d\u0442\u043e \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u043e \u043b\u044e\u0431\u044b\u043c \u0447\u0435\u043b\u043e\u0432\u0435\u043a\u043e\u043c. Storacle \u2014 \u0441\u0430\u043c\u043e\u0441\u0442\u043e\u044f\u0442\u0435\u043b\u044c\u043d\u0430\u044f \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430, \u043d\u0438\u043a\u0430\u043a\u043e\u0439 \u0441\u0432\u044f\u0437\u0438 \u0441 \u043c\u0443\u0437\u044b\u043a\u043e\u0439 \u043d\u0430\u043f\u0440\u044f\u043c\u0443\u044e \u043d\u0435\u0442. \u041c\u043e\u0436\u043d\u043e \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u0435 \u043b\u044e\u0431\u044b\u0445 \u0444\u0430\u0439\u043b\u043e\u0432. \u0412 \u043f\u0440\u0435\u0434\u044b\u0434\u0443\u0449\u0435\u0439 \u0441\u0442\u0430\u0442\u044c\u0435 \u044f [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":80225,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-80224","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041f\u0440\u0435\u0436\u0434\u0435 \u0447\u0435\u043c \u043d\u0430\u0447\u043d\u0443, \u0434\u043e\u043b\u0436\u0435\u043d \u043e\u0441\u0442\u0430\u0432\u0438\u0442\u044c.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/hr\/blog\/administrirovanie\/storacle-deczentralizovannoe-hranilishhe-fajlov\" \/>\n\t\t<meta 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