{"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\/da\/blog\/administrirovanie\/kak-napisat-smart-kontrakt-na-python-v-seti-ontology-chast-1-blockchain-block-api","title":{"rendered":"Hvordan man skriver en smart contract i Python i Ontology-netv\u00e6rket. Del 1: Blockchain &amp; Block API","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"S\u00e5dan skriver du en smart kontrakt i Python i Ontology-netv\u00e6rket. Del 1: Blockchain &amp; Block API\" src=\"\/wp-content\/uploads\/2019\/11\/4748f7bfd5e6c0b7a17ec511d22313df.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nDette er den f\u00f8rste del af en r\u00e6kke vejledende artikler om oprettelse af smart contracts i Python i blockchain-netv\u00e6rket Ontology ved hj\u00e6lp af et udviklingsv\u00e6rkt\u00f8j til smart contracts. <noindex><a rel=\"nofollow\" href=\"https:\/\/smartx.ont.io\/\">SmartX<\/a><\/noindex>. <\/p>\n<p>I denne artikel vil vi begynde at l\u00e6re om Ontology smart contract API. Ontology smart contract API er opdelt i 7 moduler: <\/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 og <\/li>\n<li>Static &amp; Dynamic Call API.<\/li>\n<\/ol>\n<p>\nBlockchain &amp; Block API er den grundl\u00e6ggende del af Ontology smart contract-systemet. Blockchain API underst\u00f8tter grundl\u00e6ggende blockchain-anmodningsoperationer, s\u00e5som at f\u00e5 den aktuelle blokh\u00f8jde, mens Block API underst\u00f8tter grundl\u00e6ggende blok-anmodningsoperationer, s\u00e5som at anmode om antallet af transaktioner for den p\u00e5g\u00e6ldende blok.<\/p>\n<p><b>Lad os komme i gang!<\/b><\/p>\n<p>Begynd med at oprette en ny kontrakt i <noindex><a rel=\"nofollow\" href=\"https:\/\/smartx.ont.io\/#\">SmartX<\/a><\/noindex>, og f\u00f8lg derefter instruktionerne nedenfor.<br \/>\n <noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h3>1. S\u00e5dan bruger du Blockchain API<\/h3>\n<p>\nLinks til smart contract-funktioner er identiske med Python-links. Du kan indtaste de relevante funktioner efter behov. For eksempel, den nedenst\u00e5ende instruktion indtaster GetHeight\u2014 funktionen til at f\u00e5 den aktuelle blokh\u00f8jde, og GetHeader\u2014 funktionen til at f\u00e5 blokheaderen.<\/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 bruges til at f\u00e5 det seneste r\u00e6kkenummer for blokken i blockchain, som vist i nedenst\u00e5ende eksempel. I det sidste eksempel udelader vi Main-funktionen for bekvemmelighed, men du kan tilf\u00f8je den, hvis det er n\u00f8dvendigt.<\/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 bruges til at f\u00e5 blokheaderen, hvor parameteren er r\u00e6kkenummeret for blokken i blockchain. Eksempel:<\/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 bruges til at hente en transaktion via transaktionshash. Transaktionshashen sendes i <i>GetTransactionByHash <\/i>som parametre i bytearray-format. N\u00f8glen til denne funktion er at konvertere transaktionshashen fra hex-format til transaktionshashen i bytearray-format. Dette er et vigtigt skridt. Ellers ville du f\u00e5 en fejl, der angiver, at der ikke findes nogen blok med den p\u00e5g\u00e6ldende hash. Lad os tage en transaktionshash i hex-format som eksempel for at konvertere den til bytearray-format. Eksemplet ser s\u00e5ledes ud:<\/p>\n<pre><code class=\"python\">9f270aa3a4c13c46891ff0e1a2bdb3ea0525669d414994aadf2606734d0c89c1<\/code><\/pre>\n<p>\nF\u00f8rst, vend transaktionshashen:<\/p>\n<pre><code class=\"python\">c1890c4d730626dfaa9449419d662505eab3bda2e1f01f89463cc1a4a30a279<\/code><\/pre>\n<p>\nUdviklere kan udf\u00f8re dette trin ved hj\u00e6lp af Hex Number(little endian)Number konverteringsv\u00e6rkt\u00f8jet, som leveres af SmartX.<\/p>\n<p>Herefter skal du konvertere det resulterende resultat til bytearray-format:<\/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>\nDette kan g\u00f8res ved hj\u00e6lp af String Byte Array konverteringsv\u00e6rkt\u00f8jet, som leveres af SmartX. Til sidst, konverter den resulterende bytearray til en lignende streng:<\/p>\n<pre><code class=\"python\">xc1x89x0cx4dx73x06x26xdfxaax94x49x41x9dx66x25x05xeaxb3xbdxa2xe1xf0x1fx89x46x3cxc1xa4xa3x0ax27x9f<\/code><\/pre>\n<p>\nNedenfor er et eksempel p\u00e5 funktionen GetTransactionByHash, som henter en transaktion ved hj\u00e6lp af transaktionshash:<\/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 bruges til at hente h\u00f8jden af en transaktion ved hj\u00e6lp af transaktionshash. Lad os tage hashen fra eksemplet ovenfor:<\/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>\nUdviklere kan bruge funktionen GetContract til at hente kontrakten ved hj\u00e6lp af kontraktens hash. Processen til at konvertere kontraktens hash svarer til den, der er n\u00e6vnt ovenfor for transaktionshash.<\/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 bruges til at hente en blok. Der er to m\u00e5der at hente en bestemt blok p\u00e5.<\/p>\n<p><b>1. Hent blok ved blokh\u00f8jde:<\/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. Hent blok ved blokhash:<\/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. Hvordan man bruger Block API<\/h3>\n<p>\nDer er tre tilg\u00e6ngelige funktioner i Block API: <i>GetTransactions<\/i>, <i>GetTransactionCount<\/i>, og <i>GetTransactionByIndex<\/i>. Vi vil gennemg\u00e5 dem \u00e9n ad gangen.<\/p>\n<h4>GetTransactionCount<\/h4>\n<p>\nGetTransactionCount bruges til at hente antallet af transaktioner for den p\u00e5g\u00e6ldende 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>\nUdviklere kan bruge funktionen GetTransactions til at hente alle transaktioner i denne blok.<\/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 bruges til at hente en specifik transaktion i denne blok.<\/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) # indekset starter fra 0.\n    return tx<\/code><\/pre>\n<p>\nDen komplette vejledning kan findes p\u00e5 vores <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>Efterord<\/h3>\n<p>\nBlockchain &amp; Block API er en uundg\u00e5elig del af smarte kontrakter, da du kan bruge dem til at foresp\u00f8rge blockchain-data og blok-data i smarte kontrakter. I de f\u00f8lgende artikler vil vi diskutere, hvordan man bruger de \u00f8vrige API'er, og unders\u00f8ge deres interaktion med Ontology blockchain.<\/p>\n<blockquote><p>Artiklen er blevet oversat af redaktionen Hashrate&amp;Shares specielt for 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> Er du udvikler? Tilmeld dig vores tekniske f\u00e6llesskab p\u00e5 <noindex><a rel=\"nofollow\" href=\"https:\/\/discord.gg\/4TQujHj\">Discord<\/a><\/noindex>. Tjek ogs\u00e5 <noindex><a rel=\"nofollow\" href=\"https:\/\/developer.ont.io\/\">Udviklercenter<\/a><\/noindex> p\u00e5 vores hjemmeside, hvor du kan finde udvikler v\u00e6rkt\u00f8jer, dokumentation og meget mere.<\/p>\n<h4>Ontology<\/h4>\n<p><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/ont.io\/\">Ontology hjemmeside<\/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\">Engelsk<\/a><\/noindex> \/ <noindex><a rel=\"nofollow\" href=\"https:\/\/t.me\/OntologyAnnouncementsRu\">Russisk<\/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>Kilde: <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 5.0.3 - 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\/da\/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) 5.0.3\" \/>\n\t\t<meta property=\"og:locale\" content=\"da_DK\" \/>\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\/da\/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\udd47S\u00e5dan skriver du en smart kontrakt i Python i Ontology-netv\u00e6rket. 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