{"id":52506,"date":"2019-11-10T00:00:00","date_gmt":"2019-11-09T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/kak-napisat-smart-kontrakt-na-python-v-seti-ontology-chast-1-blockchain-block-api"},"modified":"2020-02-18T14:00:15","modified_gmt":"2020-02-18T11:00:15","slug":"kak-napisat-smart-kontrakt-na-python-v-seti-ontology-chast-1-blockchain-block-api","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/administrirovanie\/kak-napisat-smart-kontrakt-na-python-v-seti-ontology-chast-1-blockchain-block-api","title":{"rendered":"Kako napisati pametni ugovor na Pythonu u Ontology mre\u017ei. Dio 1: Blockchain &amp; Block API","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Kako napisati pametni ugovor na Python-u u mre\u017ei Ontology. Deo 1: Blockchain &amp; Block API\" src=\"\/wp-content\/uploads\/2019\/11\/4748f7bfd5e6c0b7a17ec511d22313df.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nOvo je prvi dio serije obrazovnih \u010dlanaka o stvaranju pametnih ugovora na Pythona u blockchain mre\u017ei Ontology uz pomo\u0107 alata za razvoj pametnih ugovora. <noindex><a rel=\"nofollow\" href=\"https:\/\/smartx.ont.io\/\">SmartX<\/a><\/noindex>. <\/p>\n<p>U ovom \u010dlanku \u0107emo zapo\u010deti upoznavanje s API-jem pametnog ugovora Ontology. API pametnog ugovora Ontology podijeljen je na 7 modula: <\/p>\n<ol>\n<li>Blockchain &amp; Block API, <\/li>\n<li>Runtime API, <\/li>\n<li>Storage API, <\/li>\n<li>Native API, <\/li>\n<li>Upgrade API, <\/li>\n<li>Execution Engine API i <\/li>\n<li>Static &amp; Dynamic Call API.<\/li>\n<\/ol>\n<p>\nBlockchain &amp; Block API je osnovni dio sustava pametnih ugovora Ontology. Blockchain API podr\u017eava osnovne operacije blockchain upita, kao \u0161to je dobivanje trenutne visine bloka, dok Block API podr\u017eava osnovne operacije upita o bloku, kao \u0161to je upit o broju transakcija za dati blok.<\/p>\n<p><b>Krenimo!<\/b><\/p>\n<p>Za po\u010detak, kreirajte novi ugovor u <noindex><a rel=\"nofollow\" href=\"https:\/\/smartx.ont.io\/#\">SmartX<\/a><\/noindex>, a zatim slijedite dolje navedene upute.<br \/>\n <noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h3>1. Kako koristiti Blockchain API<\/h3>\n<p>\nReference funkcija pametnih ugovora su identi\u010dne referencama Pythona. Mo\u017eete unijeti odgovaraju\u0107e funkcije po potrebi. Na primjer, dolje navedena instrukcija unosi GetHeight\u2014 funkciju za dobivanje trenutne visine bloka, i GetHeader\u2014 funkciju za dobivanje zaglavlja bloka.<\/p>\n<pre><code class=\"python\">from ontology.interop.System.Blockchain import GetHeight, GetHeader<\/code><\/pre>\n<p><\/p>\n<h4>GetHeight<\/h4>\n<p>\nGetHeight koristi se za dobivanje posljednjeg rednog broja bloka u blockchainu, kao \u0161to je prikazano u dolje navedenom primjeru. U posljednjem primjeru, radi lak\u0161eg razumijevanja, presko\u010dit \u0107emo funkciju Main, ali je mo\u017eete dodati ako je potrebno.<\/p>\n<pre><code class=\"python\">from ontology.interop.System.Runtime import Notify\nfrom ontology.interop.System.Blockchain import GetHeight\ndef Main(operation):\n    if operation == 'demo':\n        return demo()\n    return False\n\ndef demo():\n    height=GetHeight()\n    Notify(height) # print height\n    return height #return height after running the function<\/code><\/pre>\n<p><\/p>\n<h4>GetHeader<\/h4>\n<p>\nGetHeader se koristi za dobivanje zaglavlja bloka, a kao parametar koristi redni broj bloka u blockchainu. Primjer:<\/p>\n<pre><code class=\"python\">from ontology.interop.System.Runtime import Notify\nfrom ontology.interop.System.Blockchain import GetHeader\ndef demo():\n    block_height=10\n    header=GetHeader(block_height) \n    Notify(header)\nreturn header<\/code><\/pre>\n<p><\/p>\n<h4>GetTransactionByHash<\/h4>\n<p>\nGetTransactionByHash koristi se za dobivanje transakcije putem hasha transakcije. Hash transakcije \u0161alje se u <i>GetTransactionByHash <\/i>kao parametri u formatu bytearray. Klju\u010d ove funkcije je pretvaranje hasha transakcije iz hex formata u hash transakcije u formatu bytearray. Ovo je va\u017ean korak. Ina\u010de biste dobili gre\u0161ku koja ukazuje da ne postoji blok s tim hashom. Uzmimo hash transakcije u hex formatu kao primjer, kako bismo ga prebacili u format bytearray. Primjer izgleda ovako:<\/p>\n<pre><code class=\"python\">9f270aa3a4c13c46891ff0e1a2bdb3ea0525669d414994aadf2606734d0c89c1<\/code><\/pre>\n<p>\nPrvo obrnite hash transakcije:<\/p>\n<pre><code class=\"python\">c1890c4d730626dfaa9449419d662505eab3bda2e1f01f89463cc1a4a30a279<\/code><\/pre>\n<p>\nProgrameri mogu izvr\u0161iti ovaj korak pomo\u0107u alata za konverziju Hex Number (little endian) koji nudi SmartX.<\/p>\n<p>Zatim pretvorite rezultat u format bytearray:<\/p>\n<pre><code class=\"python\">{0xc1,0x89,0x0c,0x4d,0x73,0x06,0x26,0xdf,0xaa,0x94,0x49,0x41,0x9d,0x66,0x25,0x05,0xea,0xb3,0xbd,0xa2,0xe1,0xf0,0x1f,0x89,0x46,0x3c,0xc1,0xa4,0xa3,0x0a,0x27,0x9f}<\/code><\/pre>\n<p>\nTo se mo\u017ee u\u010diniti kori\u0161tenjem alata za pretvorbu String Byte Array, koji nudi SmartX. Na kraju, pretvorite dobijeni bytearray u sli\u010dan string:<\/p>\n<pre><code class=\"python\">xc1x89x0cx4dx73x06x26xdfxaax94x49x41x9dx66x25x05xeaxb3xbdxa2xe1xf0x1fx89x46x3cxc1xa4xa3x0ax27x9f<\/code><\/pre>\n<p>\nU nastavku je primjer funkcije GetTransactionByHash, koja preuzima transakciju putem hash-a transakcije:<\/p>\n<pre><code class=\"python\">from ontology.interop.System.Blockchain import GetTransactionByHash\ndef demo():\n    # tx_hash=\"9f270aa3a4c13c46891ff0e1a2bdb3ea0525669d414994aadf2606734d0c89c1\"    \n    tx_hash=bytearray(b\"xc1x89x0cx4dx73x06x26xdfxaax94x49x41x9dx66x25x05xeaxb3xbdxa2xe1xf0x1fx89x46x3cxc1xa4xa3x0ax27x9f\")\n    tx=GetTransactionByHash(tx_hash)\n    return tx<\/code><\/pre>\n<h4>GetTransactionHeight<\/h4>\n<p>\nGetTransactionHeight se koristi za dobivanje visine transakcije putem hash-a transakcije. Uzmimo hash iz prethodnog primjera:<\/p>\n<pre><code class=\"python\">from ontology.interop.System.Blockchain import  GetTransactionHeight\ndef demo():\n    #   tx_hash=\"9f270aa3a4c13c46891ff0e1a2bdb3ea0525669d414994aadf2606734d0c89c1\"    \n    tx_hash=bytearray(b\"xc1x89x0cx4dx73x06x26xdfxaax94x49x41x9dx66x25x05xeaxb3xbdxa2xe1xf0x1fx89x46x3cxc1xa4xa3x0ax27x9f\")\n    height=GetTransactionHeight(tx_hash)\n    return height<\/code><\/pre>\n<p><\/p>\n<h4>GetContract<\/h4>\n<p>\nProgrameri mogu koristiti funkciju GetContract kako bi dobili ugovor putem hash-a ugovora. Proces konverzije hash-a ugovora sli\u010dan je procesu konverzije hash-a transakcije koji je spomenut ranije.<\/p>\n<pre><code class=\"python\">from ontology.interop.System.Blockchain import GetContract\ndef demo():\n    # contract_hash=\"d81a75a5ff9b95effa91239ff0bb3232219698fa\"    \n    contract_hash=bytearray(b\"xfax98x96x21x32x32xbbxf0x9fx23x91xfaxefx95x9bxffxa5x75x1axd8\")\n    contract=GetContract(contract_hash)\n    return contract<\/code><\/pre>\n<p><\/p>\n<h4>GetBlock<\/h4>\n<p>\nGetBlock se koristi za preuzimanje bloka. Postoje dva na\u010dina da se dobije odre\u0111eni blok.<\/p>\n<p><b>1. Dobiti blok prema visini bloka:<\/b><\/p>\n<pre><code class=\"python\">from ontology.interop.System.Blockchain import GetBlock\ndef demo():\n    block=GetBlock(1408)\n    return block<\/code><\/pre>\n<p>\n<b>2. Dobiti blok prema hash-u bloka:<\/b><\/p>\n<pre><code class=\"python\">from ontology.interop.System.Blockchain import GetBlock\ndef demo():    \n    block_hash=bytearray(b'x16xe0xc5x40x82x79x77x30x44xeax66xc8xc4x5dx17xf7x17x73x92x33x6dx54xe3x48x46x0bxc3x2fxe2x15x03xe4')\n    block=GetBlock(block_hash)<\/code><\/pre>\n<p><\/p>\n<h3>2. Kako koristiti Block API<\/h3>\n<p>\nPostoje tri dostupne funkcije u Block API-ju: <i>GetTransactions<\/i>, <i>GetTransactionCount<\/i>, i <i>GetTransactionByIndex<\/i>. Razmotri\u0107emo ih jednu po jednu.<\/p>\n<h4>GetTransactionCount<\/h4>\n<p>\nGetTransactionCount se koristi za dobivanje broja transakcija za dati blok.<\/p>\n<pre><code class=\"python\">from ontology.interop.System.Blockchain import GetBlock\nfrom ontology.interop.System.Block import GetTransactionCount\ndef demo():\n    block=GetBlock(1408)\n    count=GetTransactionCount(block)\n    return count<\/code><\/pre>\n<p><\/p>\n<h3>GetTransactions<\/h3>\n<p>\nRazvija\u010di mogu koristiti funkciju GetTransactions za dobivanje svih transakcija u ovom bloku.<\/p>\n<pre><code class=\"python\">from ontology.interop.System.Blockchain import GetBlock\nfrom ontology.interop.System.Block import GetTransactions \ndef demo():\n    block=GetBlock(1408)\n    txs=GetTransactions(block)\n    return txs<\/code><\/pre>\n<p><\/p>\n<h4>GetTransactionByIndex<\/h4>\n<p>\nGetTransactionByIndex se koristi za dobivanje specifi\u010dne transakcije u ovom bloku.<\/p>\n<pre><code class=\"python\">from ontology.interop.System.Blockchain import GetBlock\nfrom ontology.interop.System.Block import GetTransactionByIndex\ndef demo():\n    block=GetBlock(1408)\n    tx=GetTransactionByIndex(block,0) # indeks po\u010dinje od 0.\n    return tx<\/code><\/pre>\n<p>\nPotpuni vodi\u010d mo\u017eete prona\u0107i na na\u0161oj <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/punicasuite\/tutorials\/blob\/master\/smart-contracts-docs-cn\/course04_use_blockchain_api_in_smart_contract.md\">GitHub<\/a><\/noindex>.<\/p>\n<h3>Epilog<\/h3>\n<p>\nBlockchain &amp; Block API je neizostavan deo pametnih ugovora, jer ih mo\u017eete koristiti za zahteve podataka iz blockchain-a i podataka o bloku u pametnim ugovorima. U narednim \u010dlancima \u0107emo raspraviti kako koristiti ostale API-jeve i istra\u017eiti njihovu me\u0111uzavisnost s blockchain-om Ontology.<\/p>\n<blockquote><p>\u010clanak je preveden uredni\u0161tvom Hashrate&amp;Shares posebno za OntologyRussia. <noindex><a rel=\"nofollow\" href=\"https:\/\/hashrate-and-shares.ru\/kak-razrabotat-smart-kontrakt-s-pomoshchyu-python-v-seti-ontology-chast-pervaya\">klik<\/a><\/noindex> <\/p><\/blockquote>\n<p> Jeste li programer? Pridru\u017eite se na\u0161oj tehni\u010dkoj zajednici na <noindex><a rel=\"nofollow\" href=\"https:\/\/discord.gg\/4TQujHj\">Discord<\/a><\/noindex>. Tako\u0111er, zavirite u <noindex><a rel=\"nofollow\" href=\"https:\/\/developer.ont.io\/\">Centar za programere<\/a><\/noindex> na na\u0161oj web stranici, tamo mo\u017eete prona\u0107i alate za programere, dokumentaciju i jo\u0161 mnogo toga.<\/p>\n<h4>Ontology<\/h4>\n<p><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/ont.io\/\">Ontology web stranica<\/a><\/noindex> <\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/ontio\/\">GitHub<\/a><\/noindex> \/ <noindex><a rel=\"nofollow\" href=\"https:\/\/discord.gg\/pQRHtbD\">Discord<\/a><\/noindex><\/li>\n<li>Telegram <noindex><a rel=\"nofollow\" href=\"https:\/\/t.me\/OntologyNetwork\">Hrvatski<\/a><\/noindex> \/ <noindex><a rel=\"nofollow\" href=\"https:\/\/t.me\/OntologyAnnouncementsRu\">Hrvatski<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/twitter.com\/OntologyNetwork\">Twitter <\/a><\/noindex> \/ <noindex><a rel=\"nofollow\" href=\"https:\/\/www.reddit.com\/r\/OntologyNetwork\/\">Redditu <\/a><\/noindex><\/li>\n<\/ul>\n<p>Izvor: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/474966\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u042d\u0442\u043e \u043f\u0435\u0440\u0432\u0430\u044f \u0447\u0430\u0441\u0442\u044c \u0438\u0437 \u0441\u0435\u0440\u0438\u0438 \u043e\u0431\u0443\u0447\u0430\u044e\u0449\u0438\u0445 \u0441\u0442\u0430\u0442\u0435\u0439 \u043e \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u0438 \u0441\u043c\u0430\u0440\u0442-\u043a\u043e\u043d\u0442\u0440\u0430\u043a\u0442\u043e\u0432 \u043d\u0430 Python \u0432 \u0431\u043b\u043e\u043a\u0447\u0435\u0439\u043d \u0441\u0435\u0442\u0438 Ontology \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0441\u043c\u0430\u0440\u0442-\u043a\u043e\u043d\u0442\u0440\u0430\u043a\u0442\u043e\u0432 SmartX. \u0412 \u044d\u0442\u043e\u0439 \u0441\u0442\u0430\u0442\u044c\u0435 \u043c\u044b \u043d\u0430\u0447\u043d\u0451\u043c \u0437\u043d\u0430\u043a\u043e\u043c\u0441\u0442\u0432\u043e \u0441 API \u0441\u043c\u0430\u0440\u0442-\u043a\u043e\u043d\u0442\u0440\u0430\u043a\u0442\u0430 Ontology. API \u0441\u043c\u0430\u0440\u0442-\u043a\u043e\u043d\u0442\u0440\u0430\u043a\u0442\u0430 Ontology \u0440\u0430\u0437\u0434\u0435\u043b\u0435\u043d \u043d\u0430 7 \u043c\u043e\u0434\u0443\u043b\u0435\u0439: Blockchain &amp; Block API, Runtime API, Storage API, Native API, Upgrade API, Execution Engine API \u0438 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":52507,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-52506","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=\"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\/kak-napisat-smart-kontrakt-na-python-v-seti-ontology-chast-1-blockchain-block-api\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.4\" \/>\n\t\t<meta property=\"og:locale\" content=\"hr_HR\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"\ud83e\udd47\u041a\u0430\u043a \u043d\u0430\u043f\u0438\u0441\u0430\u0442\u044c \u0441\u043c\u0430\u0440\u0442-\u043a\u043e\u043d\u0442\u0440\u0430\u043a\u0442 \u043d\u0430 Python \u0432 \u0441\u0435\u0442\u0438 Ontology. \u0427\u0430\u0441\u0442\u044c 1: Blockchain &amp; Block API | ProHoster\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/prohoster.info\/hr\/blog\/administrirovanie\/kak-napisat-smart-kontrakt-na-python-v-seti-ontology-chast-1-blockchain-block-api\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:width\" content=\"350\" \/>\n\t\t<meta property=\"og:image:height\" content=\"350\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2019-11-09T21:00:00+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2020-02-18T11:00:15+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"\ud83e\udd47Kako napisati pametni ugovor na Python-u u mre\u017ei Ontology. 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