{"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\/hu\/blog\/administrirovanie\/kak-ya-proektiroval-bloki-i-tranzakczii-v-svoem-blokchejne-na-go","title":{"rendered":"Ahogyan a blokkokat \u00e9s tranzakci\u00f3kat terveztem a saj\u00e1t blokkl\u00e1ncomon Go nyelven","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Ahhoz, hogy v\u00e9g\u00fcl blokkl\u00e1ncunk legyen, \u00e9s ne csup\u00e1n adatb\u00e1zis, h\u00e1rom fontos elemet kell hozz\u00e1adnunk a projekt\u00fcnkh\u00f6z: <\/p>\n<ul>\n<li> A blokk adatainak \u00e9s m\u00f3dszereinek le\u00edr\u00e1sa<\/li>\n<li> A tranzakci\u00f3 adatai \u00e9s m\u00f3dszereinek le\u00edr\u00e1sa<\/li>\n<li> A blokkl\u00e1nc funkci\u00f3i, amelyek a blokkokat t\u00e1rolj\u00e1k az adatb\u00e1zisban, \u00e9s megtal\u00e1lj\u00e1k \u0151ket hash alapj\u00e1n vagy magass\u00e1g szerint (vagy m\u00e1s m\u00f3don).<\/li>\n<\/ul>\n<p>\n<img decoding=\"async\" alt=\"Ahogyan a blokkokat \u00e9s tranzakci\u00f3kat terveztem a saj\u00e1t blokkl\u00e1ncomon Go nyelven\" 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 \/>\nEz a m\u00e1sodik cikk a blokkl\u00e1ncr\u00f3l az ipar sz\u00e1m\u00e1ra, az els\u0151 <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/499732\/\">itt<\/a><\/noindex>.<\/p>\n<p>Eml\u00e9kezve a k\u00e9rd\u00e9sekre, amelyeket az el\u0151z\u0151 cikkemhez tettek fel az olvas\u00f3k, \u00e9rdemes megjegyezni: a blokkl\u00e1nc adatok t\u00e1rol\u00e1s\u00e1ra ebben az esetben LevelDB adatb\u00e1zist haszn\u00e1lunk, de semmi nem akad\u00e1lyozza meg, hogy b\u00e1rmely m\u00e1sikat haszn\u00e1ljunk, mondjuk a MySQL-t. Most vizsg\u00e1ljuk meg az adatok strukt\u00far\u00e1j\u00e1t.<\/p>\n<p>Kezdj\u00fck a tranzakci\u00f3kkal: <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>\u00cdme, az adatszerkezete:<\/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>\nA TX t\u00e1rolja az adat t\u00edpus\u00e1t (a tranzakci\u00f3n\u00e1l 2), a tranzakci\u00f3 hash-\u00e9t, a tranzakci\u00f3 t\u00edpus\u00e1t, az id\u0151b\u00e9lyeget, valamint a bemeneteket \u00e9s kimeneteket. A TxIn bemenetek t\u00e1rolj\u00e1k a hivatkozott tranzakci\u00f3 hash-\u00e9t, annak kimenet sz\u00e1m\u00e1t \u00e9s a byte k\u00f3dot, m\u00edg a TxOut kimenetek t\u00e1rolnak egy \u00e9rt\u00e9ket \u00e9s szint\u00e9n byte k\u00f3dot.<\/p>\n<p>Most n\u00e9zz\u00fck meg, milyen m\u0171veleteket hajthat v\u00e9gre a tranzakci\u00f3 az adataival, azaz vizsg\u00e1ljuk meg a m\u00f3dszereket.<\/p>\n<p>A tranzakci\u00f3 l\u00e9trehoz\u00e1s\u00e1ra a transaction.NewTransaction(txtype byte) *TX f\u00fcggv\u00e9ny szolg\u00e1l.<\/p>\n<p>Az AddTxIn(thattxhash []byte, txoutn int, code []byte) (*TxIn, error) met\u00f3dus \u00faj bemenetet ad a tranzakci\u00f3hoz.<\/p>\n<p>Az AddTxOut(value int, data []byte) (*TxOut, error) met\u00f3dus \u00faj kimenetet ad a tranzakci\u00f3hoz.<\/p>\n<p>A ToBytes() []byte met\u00f3dus \u00e1talak\u00edtja a tranzakci\u00f3t egy byte sorozatt\u00e1.<\/p>\n<p>A bels\u0151 preByteHash(bytes []byte) string f\u00fcggv\u00e9ny a Build() \u00e9s Check() met\u00f3dusokban alkalmaz\u00e1sra ker\u00fcl a gener\u00e1lt tranzakci\u00f3s hash-ek \u00e9s a JavaScript alkalmaz\u00e1sokb\u00f3l sz\u00e1rmaz\u00f3 hash-ek kompatibilit\u00e1s\u00e1nak biztos\u00edt\u00e1sa \u00e9rdek\u00e9ben.<\/p>\n<p>A Build() met\u00f3dus a tranzakci\u00f3 hash-\u00e9t a k\u00f6vetkez\u0151k\u00e9ppen \u00e1ll\u00edtja be: tx.TxHash = preByteHash(tx.ToBytes()).<\/p>\n<p>A ToJSON() string met\u00f3dus a tranzakci\u00f3t JSON stringg\u00e9 alak\u00edtja.<\/p>\n<p>A FromJSON(data []byte) error met\u00f3dus a tranzakci\u00f3t bet\u00f6lti a JSON form\u00e1tumb\u00f3l, amely byte slice form\u00e1j\u00e1ban lett \u00e1tadva.<\/p>\n<p>A Check() bool met\u00f3dus \u00f6sszehasonl\u00edtja a tranzakci\u00f3 hash mez\u0151j\u00e9ben l\u00e9v\u0151 hash-t azzal a hash-tel, amely a tranzakci\u00f3 hash-el\u00e9s\u00e9nek eredm\u00e9nyek\u00e9nt keletkezett (a hash mez\u0151 figyelembev\u00e9tel\u00e9vel n\u00e9lk\u00fcl).<\/p>\n<p>A tranzakci\u00f3kat a blokkokba adjuk hozz\u00e1: <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>A blokk adatszerkezete l\u00e9nyegesen \u00f6sszetettebb:<\/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>\nA DataType t\u00e1rolja az adat t\u00edpus\u00e1t, amely alapj\u00e1n a node meg tudja k\u00fcl\u00f6nb\u00f6ztetni a blokkot a tranzakci\u00f3kt\u00f3l vagy egy\u00e9b adatforr\u00e1sokt\u00f3l. Blokk eset\u00e9n ez az \u00e9rt\u00e9k 1.<\/p>\n<p>A BlockHeight t\u00e1rolja a blokk magass\u00e1g\u00e1t.<br \/>\nA Timestamp az id\u0151b\u00e9lyeg.<br \/>\nA HeaderSize a blokk m\u00e9rete byte-ban.<br \/>\nA PrevBlockHash a megel\u0151z\u0151 blokk hash \u00e9rt\u00e9ke, m\u00edg a SelfBlockHash a jelenlegi.<br \/>\nA TxsHash a tranzakci\u00f3k \u00f6sszes\u00edtett hash \u00e9rt\u00e9ke.<br \/>\nA MerkleRoot a Merkle f\u00e1gy gy\u00f6kere.<\/p>\n<p>Ezut\u00e1n a mez\u0151k tartalmazz\u00e1k a blokk l\u00e9trehoz\u00f3j\u00e1nak nyilv\u00e1nos kulcs\u00e1t, a l\u00e9trehoz\u00f3 al\u00e1\u00edr\u00e1s\u00e1t, a blokk verzi\u00f3j\u00e1t, a blokkban tal\u00e1lhat\u00f3 tranzakci\u00f3k sz\u00e1m\u00e1t \u00e9s magukat a tranzakci\u00f3kat.<\/p>\n<p>Vizsg\u00e1ljuk meg a met\u00f3dusait:<br \/>\nA blokk l\u00e9trehoz\u00e1s\u00e1hoz a block.NewBlock() f\u00fcggv\u00e9nyt haszn\u00e1ljuk: NewBlock(prevBlockHash string, height int) *Block, amely a megel\u0151z\u0151 blokk hash \u00e9rt\u00e9k\u00e9t \u00e9s a blokkl\u00e1ncban l\u00e9trehozott blokk magass\u00e1g\u00e1t veszi figyelembe. A blokk t\u00edpus\u00e1t a types csomag konstans\u00e1b\u00f3l \u00e1ll\u00edtjuk be: <\/p>\n<pre><code class=\"go\">b.DataType = types.BLOCK_TYPE.<\/code><\/pre>\n<p>Az AddTx(tx *transaction.TX) met\u00f3dus tranzakci\u00f3t ad hozz\u00e1 a blokkhoz.<\/p>\n<p>A Build() met\u00f3dus bet\u00f6lti a mez\u0151k \u00e9rt\u00e9keit \u00e9s gener\u00e1lja, valamint be\u00e1ll\u00edtja a blokk aktu\u00e1lis hash \u00e9rt\u00e9k\u00e9t.<\/p>\n<p>A ToBytesHeader() []byte met\u00f3dus a blokk fejl\u00e9cek (tranzakci\u00f3k n\u00e9lk\u00fcl) byte szl\u00e1jzba konvert\u00e1lja.<\/p>\n<p>A ToJSON() string met\u00f3dus a blokkot JSON form\u00e1tumba alak\u00edtja, sztring reprezent\u00e1ci\u00f3ban.<\/p>\n<p>A FromJSON(data []byte) error met\u00f3dus a JSON-b\u00f3l bet\u00f6lti az adatokat a blokk strukt\u00far\u00e1j\u00e1ba.<\/p>\n<p>A Check() bool met\u00f3dus gener\u00e1lja a blokk hash \u00e9rt\u00e9k\u00e9t \u00e9s \u00f6sszehasonl\u00edtja a blokk hash mez\u0151j\u00e9ben megadott \u00e9rt\u00e9kkel.<\/p>\n<p>A GetTxsHash() string met\u00f3dus visszaadja a blokkban tal\u00e1lhat\u00f3 tranzakci\u00f3k \u00f6sszes\u00edtett hash \u00e9rt\u00e9k\u00e9t.<\/p>\n<p>A GetMerkleRoot() met\u00f3dus be\u00e1ll\u00edtja a tranzakci\u00f3k Merkle f\u00e1j\u00e1nak gy\u00f6k\u00e9r \u00e9rt\u00e9k\u00e9t a blokkban.<\/p>\n<p>A Sign(privk string) met\u00f3dus a blokkot al\u00e1\u00edrja a blokk l\u00e9trehoz\u00f3j\u00e1nak priv\u00e1t kulcs\u00e1val.<\/p>\n<p>A SetHeight(height int) met\u00f3dus be\u00edrja a blokk magass\u00e1g\u00e1t a blokk strukt\u00far\u00e1j\u00e1nak mez\u0151j\u00e9be.<\/p>\n<p>A GetHeight() int met\u00f3dus visszaadja a blokk magass\u00e1g\u00e1t, ahogy az a strukt\u00fara megfelel\u0151 mez\u0151j\u00e9ben van megadva.<\/p>\n<p>A ToGOBBytes() []byte met\u00f3dus a blokkot GOB form\u00e1tumban k\u00f3dolja, \u00e9s visszaadja byte szl\u00e1jzk\u00e9nt.<\/p>\n<p>A FromGOBBytes(data []byte) error met\u00f3dus a blokk adatait GOB form\u00e1tumban \u00edrja be a blokk strukt\u00far\u00e1j\u00e1ba a megadott byte szl\u00e1jzb\u00f3l.<\/p>\n<p>A GetHash() string met\u00f3dus visszaadja az adott blokk hash \u00e9rt\u00e9k\u00e9t.<\/p>\n<p>A GetPrevHash() string met\u00f3dus visszaadja a megel\u0151z\u0151 blokk hash \u00e9rt\u00e9k\u00e9t.<\/p>\n<p>A SetPublicKey(pubk string) met\u00f3dus a blokkba be\u00edrja a blokk l\u00e9trehoz\u00f3j\u00e1nak nyilv\u00e1nos kulcs\u00e1t.<\/p>\n<p>\u00cdgy a Block objektum m\u00f3dszereivel k\u00f6nnyen \u00e1tkonvert\u00e1lhatjuk azt olyan form\u00e1tumba, amely alkalmas h\u00e1l\u00f3zati tov\u00e1bb\u00edt\u00e1sra \u00e9s a LevelDB adatb\u00e1zisban val\u00f3 t\u00e1rol\u00e1sra.<\/p>\n<p>A blokkl\u00e1ncba val\u00f3 t\u00e1rol\u00e1s\u00e9rt a blockchain csomag funkci\u00f3i felelnek: <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>Ehhez a blokknak meg kell val\u00f3s\u00edtania az IBlock interf\u00e9szt:<\/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>\nAz adatb\u00e1zishoz val\u00f3 kapcsol\u00f3d\u00e1st egyszer hozzuk l\u00e9tre a csomag inicializ\u00e1l\u00e1sakor az init() funkci\u00f3ban: <\/p>\n<pre><code class=\"go\">db, err = leveldb.OpenFile(BLOCKCHAIN_DB_DEBUG, nil).<\/code><\/pre>\n<p>\nA CloseDB() a db.Close() k\u00f6r\u00e9 csomagolt h\u00edv\u00e1s \u2014 ezt a csomag funkci\u00f3ival val\u00f3 munka ut\u00e1n h\u00edvj\u00e1k, hogy bez\u00e1rja az adatb\u00e1zis-kapcsolatot.<\/p>\n<p>A SetTargetBlockHash(hash string) error funkci\u00f3 a BLOCK_HASH \u00e1lland\u00f3val megadott kulccsal a jelenlegi blokk hash-\u00e9t \u00edrja az adatb\u00e1zisba.<\/p>\n<p>A GetTargetBlockHash() (string, error) funkci\u00f3 visszaadja a jelenlegi blokk hash-\u00e9t, amely az adatb\u00e1zisban tal\u00e1lhat\u00f3.<\/p>\n<p>A SetTargetBlockHeight(height int) error funkci\u00f3 a BLOCK_HEIGHT \u00e1lland\u00f3val megadott kulccsal az adatb\u00e1zisba \u00edrja a blokkl\u00e1nc magass\u00e1g\u00e1t a csom\u00f3pont sz\u00e1m\u00e1ra.<\/p>\n<p>A GetTargetBlockHeight() (int, error) funkci\u00f3 visszaadja a blokk l\u00e1nc magass\u00e1g\u00e1t a megadott csom\u00f3ponthoz, amely az adatb\u00e1zisban van t\u00e1rolva.<\/p>\n<p>A CheckBlock(block IBlock) bool funkci\u00f3 a blokk \u00e9rv\u00e9nyess\u00e9g\u00e9nek ellen\u0151rz\u00e9s\u00e9t v\u00e9gzi el, miel\u0151tt ezt a blokkot hozz\u00e1adn\u00e1nk a blokkl\u00e1nchoz.<\/p>\n<p>Az AddBlock(block IBlock) error funkci\u00f3 hozz\u00e1adja a blokkot a blokkl\u00e1nchoz.<\/p>\n<p>A blokkok lek\u00e9r\u00e9s\u00e9re \u00e9s megjelen\u00edt\u00e9s\u00e9re szolg\u00e1l\u00f3 funkci\u00f3k a blockchain csomag explore.go f\u00e1jlj\u00e1ban tal\u00e1lhat\u00f3k:<\/p>\n<p>A GetBlockByHash(hash string) (*block.Block, error) funkci\u00f3 egy \u00fcres blokkobjektumot hoz l\u00e9tre, bet\u00f6lti a blokkot az adatb\u00e1zisb\u00f3l, amelynek a hash-e \u00e1t van adva, \u00e9s visszaadja r\u00e1 a mutat\u00f3t.<\/p>\n<p>A gen\u00e9zis blokk l\u00e9trehoz\u00e1s\u00e1t a Genesis() error funkci\u00f3 v\u00e9gzi a blockchain csomag genesis.go f\u00e1jlj\u00e1b\u00f3l.<\/p>\n<p>A k\u00f6vetkez\u0151 cikkben a kliensek csom\u00f3ponthoz val\u00f3 csatlakoz\u00e1s\u00e1r\u00f3l lesz sz\u00f3 a WebSocket mechanizmus seg\u00edts\u00e9g\u00e9vel.<br \/>\n<br \/>Forr\u00e1s: <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 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