{"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\/ro\/blog\/administrirovanie\/kak-napisat-smart-kontrakt-na-python-v-seti-ontology-chast-1-blockchain-block-api","title":{"rendered":"Cum s\u0103 scrii un smart contract pe Python \u00een re\u021beaua Ontology. Partea 1: Blockchain &amp; Block API","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Cum s\u0103 scrii un contract inteligent \u00een Python pe re\u021beaua Ontology. Partea 1: Blockchain &amp; Block API\" src=\"\/wp-content\/uploads\/2019\/11\/4748f7bfd5e6c0b7a17ec511d22313df.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAceasta este prima parte dintr-o serie de articole educa\u021bionale despre crearea de contracte inteligente \u00een Python \u00een re\u021beaua blockchain Ontology, folosind instrumentul de dezvoltare a contractelor inteligente. <noindex><a rel=\"nofollow\" href=\"https:\/\/smartx.ont.io\/\">SmartX<\/a><\/noindex>. <\/p>\n<p>\u00cen acest articol, vom \u00eencepe s\u0103 ne familiariz\u0103m cu API-ul contractului inteligent Ontology. API-ul contractului inteligent Ontology este \u00eemp\u0103r\u021bit \u00een 7 module: <\/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 \u0219i <\/li>\n<li>Static &amp; Dynamic Call API.<\/li>\n<\/ol>\n<p>\nBlockchain &amp; Block API este partea principal\u0103 a sistemului de contracte inteligente Ontology. API-ul Blockchain sus\u021bine opera\u021biuni de baz\u0103 pentru cererile blockchain, cum ar fi ob\u021binerea \u00een\u0103l\u021bimii curente a blocului, \u00een timp ce API-ul Block sus\u021bine opera\u021biuni de baz\u0103 pentru cererile de bloc, cum ar fi solicitarea num\u0103rului de tranzac\u021bii pentru un anumit bloc.<\/p>\n<p><b>S\u0103 \u00eencepem!<\/b><\/p>\n<p>Pentru \u00eenceput, crea\u021bi un nou contract \u00een <noindex><a rel=\"nofollow\" href=\"https:\/\/smartx.ont.io\/#\">SmartX<\/a><\/noindex>, apoi urma\u021bi instruc\u021biunile de mai jos.<br \/>\n <noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h3>1. Cum s\u0103 utiliza\u021bi Blockchain API<\/h3>\n<p>\nLeg\u0103turile c\u0103tre func\u021biile contractelor inteligente sunt identice cu leg\u0103turile Python. Pute\u021bi introduce func\u021biile corespunz\u0103toare dup\u0103 necesitate. De exemplu, instruc\u021biunea de mai jos introduce GetHeight\u2014 func\u021bia pentru ob\u021binerea \u00een\u0103l\u021bimii curente a blocului, \u0219i GetHeader\u2014 func\u021bia pentru ob\u021binerea titlului blocului.<\/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 este utilizat pentru a ob\u021bine ultimul num\u0103r de ordine al blocului \u00een blockchain, a\u0219a cum se arat\u0103 \u00een exemplul de mai jos. \u00cen ultimul exemplu, pentru comoditate, vom omite func\u021bia Main, dar o pute\u021bi ad\u0103uga dac\u0103 este necesar.<\/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 este utilizat pentru a ob\u021bine titlul blocului, parametrul fiind num\u0103rul de ordine al blocului \u00een blockchain. Exemplu:<\/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 este utilizat pentru a ob\u021bine tranzac\u021bia prin hash-ul tranzac\u021biilor. Hash-ul tranzac\u021biei este trimis \u00een <i>GetTransactionByHash <\/i>ca parametru \u00een format bytearray. Cheia acestei func\u021bii este conversia hash-ului tranzac\u021biei din format hex \u00een hash-ul tranzac\u021biei \u00een format bytearray. Acesta este un pas important. Altfel, ve\u021bi primi o eroare care indic\u0103 c\u0103 nu exist\u0103 un bloc cu acest hash. S\u0103 lu\u0103m hash-ul tranzac\u021biei \u00een format hex ca exemplu pentru a-l converti \u00een format bytearray. Exemplul arat\u0103 astfel:<\/p>\n<pre><code class=\"python\">9f270aa3a4c13c46891ff0e1a2bdb3ea0525669d414994aadf2606734d0c89c1<\/code><\/pre>\n<p>\nMai \u00eent\u00e2i, r\u0103sturna\u021bi hash-ul tranzac\u021biei:<\/p>\n<pre><code class=\"python\">c1890c4d730626dfaa9449419d662505eab3bda2e1f01f89463cc1a4a30a279<\/code><\/pre>\n<p>\nDezvoltatorii pot realiza acest pas cu ajutorul instrumentului de conversie Hex Number (little endian) oferit de SmartX.<\/p>\n<p>Apoi, transforma\u021bi rezultatul ob\u021binut \u00eentr-un 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>\nAcest lucru se poate face cu ajutorul instrumentului de conversie String Byte Array, care este furnizat de SmartX. La final, transforma\u021bi bytearray-ul ob\u021binut \u00eentr-un string similar:<\/p>\n<pre><code class=\"python\">xc1x89x0cx4dx73x06x26xdfxaax94x49x41x9dx66x25x05xeaxb3xbdxa2xe1xf0x1fx89x46x3cxc1xa4xa3x0ax27x9f<\/code><\/pre>\n<p>\nMai jos este un exemplu de func\u021bie GetTransactionByHash, care preia o tranzac\u021bie prin intermediul hash-ului tranzac\u021biei:<\/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 este utilizat pentru a ob\u021bine \u00een\u0103l\u021bimea unei tranzac\u021bii prin intermediul hash-ului tranzac\u021biei. S\u0103 lu\u0103m hash-ul din exemplul de mai sus:<\/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>\nDezvoltatorii pot utiliza func\u021bia GetContract pentru a ob\u021bine un contract prin intermediul hash-ului contractului. Procesul de conversie a hash-ului contractului este similar cu cel al hash-ului tranzac\u021biei men\u021bionat mai sus.<\/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 este utilizat pentru a ob\u021bine un bloc. Exist\u0103 dou\u0103 modalit\u0103\u021bi de a ob\u021bine un bloc specific.<\/p>\n<p><b>1. Ob\u021bine\u021bi blocul dup\u0103 \u00een\u0103l\u021bimea blocului:<\/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. Ob\u021bine\u021bi blocul dup\u0103 hash-ul blocului:<\/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. Cum s\u0103 utiliza\u021bi Block API<\/h3>\n<p>\nExist\u0103 trei func\u021bii disponibile \u00een Block API: <i>GetTransactions<\/i>, <i>GetTransactionCount<\/i>, \u0219i <i>GetTransactionByIndex<\/i>. Le vom analiza una c\u00e2te una.<\/p>\n<h4>GetTransactionCount<\/h4>\n<p>\nGetTransactionCount este utilizat pentru a ob\u021bine num\u0103rul de tranzac\u021bii pentru un anumit bloc.<\/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>\nDezvoltatorii pot utiliza func\u021bia GetTransactions pentru a ob\u021bine toate tranzac\u021biile din acest bloc.<\/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 este utilizat pentru a ob\u021bine o tranzac\u021bie specific\u0103 din acest bloc.<\/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) # indexul \u00eencepe de la 0.\n    return tx<\/code><\/pre>\n<p>\nGhidul complet poate fi g\u0103sit pe site-ul nostru <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>Cuv\u00e2nt \u00eenainte<\/h3>\n<p>\nBlockchain &amp; Block API este o parte esen\u021bial\u0103 a contractelor inteligente, deoarece le pute\u021bi utiliza pentru a solicita datele blockchain-ului \u0219i datele blocului \u00een contractele inteligente. \u00cen articolele urm\u0103toare, vom discuta despre utilizarea celorlalte API-uri \u0219i vom explora interac\u021biunile lor cu blockchain-ul Ontology.<\/p>\n<blockquote><p>Articolul a fost tradus de redac\u021bia Hashrate&amp;Shares special pentru OntologyRussia. <noindex><a rel=\"nofollow\" href=\"https:\/\/hashrate-and-shares.ru\/kak-razrabotat-smart-kontrakt-s-pomoshchyu-python-v-seti-ontology-chast-pervaya\">clic<\/a><\/noindex> <\/p><\/blockquote>\n<p> E\u0219ti dezvoltator? Al\u0103tur\u0103-te comunit\u0103\u021bii noastre tehnice pe <noindex><a rel=\"nofollow\" href=\"https:\/\/discord.gg\/4TQujHj\">Discord<\/a><\/noindex>. De asemenea, arunc\u0103 o privire pe <noindex><a rel=\"nofollow\" href=\"https:\/\/developer.ont.io\/\">Centrul de Dezvoltatori<\/a><\/noindex> pe site-ul nostru, unde pute\u021bi g\u0103si instrumente pentru dezvoltatori, documenta\u021bie \u0219i multe altele.<\/p>\n<h4>Ontology<\/h4>\n<p><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/ont.io\/\">site-ul web Ontology<\/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\">Englez\u0103<\/a><\/noindex> \/ <noindex><a rel=\"nofollow\" href=\"https:\/\/t.me\/OntologyAnnouncementsRu\">Rus\u0103<\/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\/\">Reddit <\/a><\/noindex><\/li>\n<\/ul>\n<p>Sursa: <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 5.0.2.1 - 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\/ro\/blog\/administrirovanie\/kak-napisat-smart-kontrakt-na-python-v-seti-ontology-chast-1-blockchain-block-api\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.2.1\" \/>\n\t\t<meta property=\"og:locale\" content=\"ro_RO\" \/>\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\/ro\/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\udd47Cum s\u0103 scrii un contract inteligent \u00een Python pe re\u021beaua Ontology. 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