{"id":80122,"date":"2020-05-03T13:42:34","date_gmt":"2020-05-03T11:42:34","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/kak-ya-proektiroval-bloki-i-tranzakczii-v-svoem-blokchejne-na-go"},"modified":"2020-05-03T13:42:34","modified_gmt":"2020-05-03T11:42:34","slug":"kak-ya-proektiroval-bloki-i-tranzakczii-v-svoem-blokchejne-na-go","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/kak-ya-proektiroval-bloki-i-tranzakczii-v-svoem-blokchejne-na-go","title":{"rendered":"Kuidas ma projekteerisin plokke ja tehinguid oma plokiahelas Go-s","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Kuna plokiahelaks saamine eeldab, et te ei kasuta lihtsalt andmebaasi, peame oma projektile lisama kolm olulist elementi: <\/p>\n<ul>\n<li> Ploki andmestruktuuri ja meetodite kirjeldus<\/li>\n<li> Tehingu andmestruktuuri ja meetodite kirjeldus<\/li>\n<li> Plokiahela funktsioonid, mis salvestavad plokid andmebaasi ja leiavad need seal nende hash'i v\u00f5i k\u00f5rguse (v\u00f5i muude viiside) j\u00e4rgi.<\/li>\n<\/ul>\n<p>\n<img decoding=\"async\" alt=\"Kuidas ma projekteerisin plokke ja tehinguid oma plokiahelas Go-s\" src=\"\/wp-content\/uploads\/2020\/05\/75099a735419b5c2bfbffa82865d1d4a.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nSee on teine artikkel plokiahela kohta t\u00f6\u00f6stuses, esimene <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/499732\/\">siit<\/a><\/noindex>.<\/p>\n<p>Meeldetuletus, arvestades k\u00fcsimusi, mis mulle eelneva artikli puhul esitati, tuleks m\u00e4rkida: plokiahela andmete salvestamiseks kasutatakse antud juhul LevelDB andmebaasi, kuid miski ei takista kasutada m\u00f5nda muud, n\u00e4iteks MySQL. N\u00fc\u00fcd uurime nende andmete struktuuri.<\/p>\n<p>Alustame tehingutest: <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/Rusldv\/bcstartup\/blob\/master\/transaction\/builder.go\">github.com\/Rusldv\/bcstartup\/blob\/master\/transaction\/builder.go<\/a><\/noindex><\/p>\n<p>Siin on selle andmestruktuur:<\/p>\n<pre><code class=\"go\">type TX struct {\n\tDataType byte\t\t\n\tTxHash string \n\tTxType byte\t\n\tTimestamp int64\t\t\n\tINs []TxIn\n\tOUTs []TxOut\n}\n\ntype TxIn struct {\n\tThatTxHash string\n\tTxOutN int\n\tByteCode string\n}\n\ntype TxOut struct {\n\tValue int\n\tByteCode string\n}<\/code><\/pre>\n<p>\nTX-s hoitakse andmet\u00fc\u00fcpi (tehingu jaoks 2), selle tehingu hash'i, tehingu t\u00fc\u00fcpi, ajatemplit ning sisse- ja v\u00e4ljaminekuid. Sisseanded TxIn hoiavad tehingu hash'i, millele viidatakse, selle v\u00e4ljamineku numbrit ja bytecode'i, v\u00e4ljundid TxOut hoiavad mingit v\u00e4\u00e4rtust ja samuti bytecode'i.<\/p>\n<p>N\u00fc\u00fcd vaatame, milliseid toiminguid v\u00f5ib tehing andmetega teha, st uurime meetodeid.<\/p>\n<p>Tehingu loomiseks on funktsioon transaction.NewTransaction(txtype byte) *TX.<\/p>\n<p>Meetod AddTxIn(thattxhash []byte, txoutn int, code []byte) (*TxIn, error) lisab tehingule sissekande.<\/p>\n<p>Meetod AddTxOut(value int, data []byte) (*TxOut, error) lisab tehingule v\u00e4ljundi.<\/p>\n<p>Meetod ToBytes() []byte muudab tehingu byte-salvestusj\u00e4rguks.<\/p>\n<p>Sisefunktsioon preByteHash(bytes []byte) string rakendatakse funktsioonides Build() ja Check() tehingu hash'i \u00fchilduvuse tagamiseks JavaScripti rakendustest genereeritud tehingu hash'idega.<\/p>\n<p>Meetod Build() m\u00e4\u00e4rab tehingu hash'i j\u00e4rgmiselt: tx.TxHash = preByteHash(tx.ToBytes()).<\/p>\n<p>Meetod ToJSON() string konverteerib tehingu JSON stringiks.<\/p>\n<p>Meetod FromJSON(data []byte) error laadib tehingu JSON-formaadist, mis edastatakse byte-salvestusj\u00e4rguna.<\/p>\n<p>Meetod Check() bool v\u00f5rreldab v\u00e4ljastatud hash'i tehingu hash'i v\u00e4lja, mis saadi selle tehingu hash'imise tulemusena (ilma hash'i v\u00e4lja arvestamata).<\/p>\n<p>Tehingud lisatakse plokkidesse: <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/Rusldv\/bcstartup\/blob\/master\/block\/builder.go\">github.com\/Rusldv\/bcstartup\/blob\/master\/block\/builder.go<\/a><\/noindex><\/p>\n<p>Bloki andmete struktuur on mahukam:<\/p>\n<pre><code class=\"go\">type Block struct {\n\tDataType byte\t\t\t\t\n\tBlockHeight int\t\t\t\t\t\n        Timestamp int64\t\t\t\t \n        HeaderSize int\t\t\t\t\t\n        PrevBlockHash string\t\t\t\t \n        SelfBlockHash string\t\t\t\n\tTxsHash string\t\t\t\n\tMerkleRoot string\n\tCreatorPublicKey string\t\t\t\n\tCreatorSig string\n\tVersion int\n\tTxsN int\n\tTxs []transaction.TX\n}<\/code><\/pre>\n<p>\nDataType salvestab andmete t\u00fc\u00fcbi, selle j\u00e4rgi eristab s\u00f5lm bloki tehingutest v\u00f5i muudest andmetest. Bloki puhul on selle v\u00e4\u00e4rtus 1.<\/p>\n<p>BlockHeight salvestab bloki k\u00f5rguse.<br \/>\nTimestamp on ajam\u00e4rk.<br \/>\nHeaderSize on bloki suurus baitides.<br \/>\nPrevBlockHash on eelmise bloki hash, samas kui SelfBlockHash \u2014 praegune.<br \/>\nTxsHash on k\u00f5igi tehingute koondhash.<br \/>\nMerkleRoot on Merkle puu juur.<\/p>\n<p>Edasi v\u00e4ljadel on bloki looja avalik v\u00f5ti, looja allkiri, bloki versioon, tehingute arv blokis ja need tehingud ise.<\/p>\n<p>Vaadakem selle meetodeid:<br \/>\nBloki loomiseks kasutatakse funktsiooni block.NewBlock(): NewBlock(prevBlockHash string, height int) *Block, mis v\u00f5tab vastu eelmise bloki hash'i ja k\u00f5rguse, mis on loodud bloki jaoks plokiahelas. Samuti m\u00e4\u00e4ratakse bloki t\u00fc\u00fcp types paketi konstandist: <\/p>\n<pre><code class=\"go\">b.DataType = types.BLOCK_TYPE.<\/code><\/pre>\n<p>Meetod AddTx(tx *transaction.TX) lisab tehingu blokki.<\/p>\n<p>Meetod Build() laadib v\u00e4\u00e4rtused bloki v\u00e4ljadessa ja genereerib ning seadistab selle praeguse hash'i.<\/p>\n<p>Meetod ToBytesHeader() []byte teisendab bloki pealkirja (ilma tehinguteta) baitide l\u00f5ikeks.<\/p>\n<p>Meetod ToJSON() string teisendab bloki JSON formaati stringi andmete kujul.<\/p>\n<p>Meetod FromJSON(data []byte) error laadib andmed JSON'ist bloki struktuuri.<\/p>\n<p>Meetod Check() bool genereerib bloki hash'i ja v\u00f5rdleb seda bloki hash'i v\u00e4ljas m\u00e4\u00e4ratletud v\u00e4\u00e4rtusega.<\/p>\n<p>Meetod GetTxsHash() string tagastab k\u00f5igi tehingute koondhash'i blokis.<\/p>\n<p>Meetod GetMerkleRoot() m\u00e4\u00e4rab bloki tehingute Merkle puu juure.<\/p>\n<p>Meetod Sign(privk string) allkirjastab bloki looja privaatv\u00f5tmega.<\/p>\n<p>Meetod SetHeight(height int) kirjutab bloki k\u00f5rguse struktuuri v\u00e4li.<\/p>\n<p>Meetod GetHeight() int tagastab bloki k\u00f5rguse, nagu on m\u00e4\u00e4ratud struktuuri v\u00e4ljas.<\/p>\n<p>Meetod ToGOBBytes() []byte kodeerib bloki GOB formaati ja tagastab selle baitide l\u00f5ikena.<\/p>\n<p>Meetod FromGOBBytes(data []byte) error kirjutab bloki andmed struktuuri GOB formaadis edastatud baitide l\u00f5ikest.<\/p>\n<p>Meetod GetHash() string tagastab antud bloki hash'i.<\/p>\n<p>Meetod GetPrevHash() string tagastab eelmise bloki hash'i.<\/p>\n<p>Meetod SetPublicKey(pubk string) kirjutab bloki sisse looja avaliku v\u00f5ti.<\/p>\n<p>Seega saame Block objekti meetodite abil h\u00f5lpsasti konverteerida selle v\u00f5rgu edastamiseks ja LevelDB andmebaasi salvestamiseks sobivasse vormi.<\/p>\n<p>Plokiahela salvestamise eest vastutavad blockchain paketi funktsioonid: <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/Rusldv\/bcstartup\/tree\/master\/blockchain\">github.com\/Rusldv\/bcstartup\/tree\/master\/blockchain<\/a><\/noindex><\/p>\n<p>Selleks peab blokki rakendama IBlock liidest:<\/p>\n<pre><code class=\"go\">type IGOBBytes interface {\n\tToGOBBytes() []byte\n\tFromGOBBytes(data []byte) error\n}\n\ntype IBlock interface {\n\tIGOBBytes\n\tGetHash() string\n\tGetPrevHash() string\n\tGetHeight() int\n\tCheck() bool\n\n}<\/code><\/pre>\n<p>\nAndmebaasiga \u00fchendus luuakse \u00fcks kord paketi initsialiseerimise ajal init() funktsioonis: <\/p>\n<pre><code class=\"go\">db, err = leveldb.OpenFile(BLOCKCHAIN_DB_DEBUG, nil).<\/code><\/pre>\n<p>\nCloseDB() on db.Close() \u00fcmberminek \u2014 seda kutsutakse v\u00e4lja p\u00e4rast paketi funktsioonidega t\u00f6\u00f6tamist, et sulgeda andmebaasiga \u00fchendus.<\/p>\n<p>Funktsioon SetTargetBlockHash(hash string) error salvestab andmebaasi praeguse ploki hash'i v\u00f5tme all, mille m\u00e4\u00e4rab konstandi BLOCK_HASH v\u00e4\u00e4rtus.<\/p>\n<p>Funktsioon GetTargetBlockHash() (string, error) tagastab andmebaasis hoitud praeguse ploki hash'i.<\/p>\n<p>Funktsioon SetTargetBlockHeight(height int) error salvestab andmebaasi plokiahela k\u00f5rguse v\u00e4\u00e4rtuse s\u00f5lmele, mille m\u00e4\u00e4rab konstandi BLOCK_HEIGHT v\u00f5tme v\u00e4\u00e4rtus.<\/p>\n<p>Funktsioon GetTargetBlockHeight() (int, error) tagastab antud s\u00f5lme plokiahela k\u00f5rguse, mis on salvestatud andmebaasis.<\/p>\n<p>Funktsioon CheckBlock(block IBlock) bool kontrollib ploki \u00f5igsust enne selle lisamist plokiahelasse.<\/p>\n<p>Funktsioon AddBlock(block IBlock) error lisab ploki plokiahelasse.<\/p>\n<p>Blokke saamiseks ja vaatamiseks m\u00f5eldud funktsioonid asuvad blockchain paketi failis explore.go:<\/p>\n<p>Funktsioon GetBlockByHash(hash string) (*block.Block, error) loob t\u00fchi ploki objekti, laadib sinna andmebaasist ploki, mille hash on talle edastatud, ja tagastab sellele viitaja.<\/p>\n<p>Genezise ploki loomine toimub funktsiooni Genesis() error kaudu blockchain paketi failist genesis.go.<\/p>\n<p>j\u00e4rgmisel artiklil r\u00e4\u00e4gitakse klientide s\u00f5lme \u00fchendamisest WebSocket mehhanismi abil.<br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/499930\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0414\u043b\u044f \u0442\u043e\u0433\u043e, \u0447\u0442\u043e\u0431\u044b \u0432 \u043a\u043e\u043d\u0435\u0447\u043d\u043e\u043c \u0441\u0447\u0435\u0442\u0435 \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u044f\u0441\u044f \u0431\u043b\u043e\u043a\u0447\u0435\u0439\u043d, \u0430 \u043d\u0435 \u043f\u0440\u043e\u0441\u0442\u043e \u0431\u0430\u0437\u0430 \u0434\u0430\u043d\u043d\u044b\u0445, \u043d\u0430\u043c \u043d\u0443\u0436\u043d\u043e \u0434\u043e\u0431\u0430\u0432\u0438\u0442\u044c \u0432 \u0441\u0432\u043e\u0439 \u043f\u0440\u043e\u0435\u043a\u0442 3 \u0432\u0430\u0436\u043d\u044b\u0445 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u0430: \u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u044b \u0434\u0430\u043d\u043d\u044b\u0445 \u0438 \u043c\u0435\u0442\u043e\u0434\u043e\u0432 \u0431\u043b\u043e\u043a\u0430 \u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u044b \u0434\u0430\u043d\u043d\u044b\u0445 \u0438 \u043c\u0435\u0442\u043e\u0434\u043e\u0432 \u0442\u0440\u0430\u043d\u0437\u0430\u043a\u0446\u0438\u0438 \u0424\u0443\u043d\u043a\u0446\u0438\u0438 \u0431\u043b\u043e\u043a\u0447\u0435\u0439\u043d\u0430, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0441\u043e\u0445\u0440\u0430\u043d\u044f\u044e\u0442 \u0431\u043b\u043e\u043a\u0438 \u0432 \u0411\u0414 \u0438 \u043d\u0430\u0445\u043e\u0434\u044f\u0442 \u0438\u0445 \u0442\u0430\u043c \u043f\u043e \u0438\u0445 \u0445\u0435\u0448\u0443 \u0438\u043b\u0438 \u0432\u044b\u0441\u043e\u0442\u0435 (\u0438\u043b\u0438 \u0435\u0449\u0435 \u043a\u0430\u043a \u043d\u0438\u0431\u0443\u0434\u044c). \u042d\u0442\u043e [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":80123,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-80122","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0414\u043b\u044f \u0442\u043e\u0433\u043e, \u0447\u0442\u043e\u0431\u044b \u0432 \u043a\u043e\u043d\u0435\u0447\u043d\u043e\u043c \u0441\u0447\u0435\u0442\u0435 \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u044f\u0441\u044f \u0431\u043b\u043e\u043a\u0447\u0435\u0439\u043d, \u0430 \u043d\u0435 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