Golang Blockchain Development 001-Initialization of Blockchain

I. Code STRUCTURE

block.go: Defining block structures and methods

blockchain.go: Defining blockchain structures and methods

help.go: Encapsulates a common code block to form a help library

main.go: Test code

two. Defining the block structure and method

package blcimport  (    "Time"     "StrConv"     "bytes"     "crypto/sha256")//define chunk TYPE BLOCK STRUCT {   //1. Block height, which is the block number, Number of blocks    HEIGHT INT64   //2. The hash value of the previous chunk    preblockhash [ ]BYTE   //3. Transaction data (which ultimately belongs to transaction  transaction)    data []byte   / /4. Timestamp of creation time    TIMESTAMP INT64   //5. The hash value of the current chunk    hash [ ]byte   //6.nonce  random number, used to verify the work proof    nonce int64}//defines the method of generating hash in block func   (Block *block)  sethash ()  {   //1. Convert height  to byte array  []byte    heightbytes := inttohex (block. Height)    //2. Convert timestamp  to byte array  []byte   //2.1  Int64 timestamp   converted to binary    timestring := strconv. Formatint (block. TimeSTAMP, 2)    //2.2  convert binary string to byte array    timebytes := []byte ( timestring)    //3. Stitching all attributes to form a two-dimensional byte array    blockbytes := bytes. Join ([][]byte{heightbytes, block. Preblockhash, block. Data, timebytes, block. hash}, []byte{})    //4. Generate hash   hash := sha256. Sum256 (blockbytes)    block. hash = hash[:]}//1.  Create a new chunk Func newblock (data string, height int64,  Preblockhash []byte)  *block {   //Create block    block := & block{      height,      preblockhash,       []byte (data),       time. Now (). Unix (),      nil,      0,   }    //set Hash   block.Sethash ()    return block}//2. Generate Genesis Block Func creategenesisblock (data string)  * Block {   return newblock (data, 1, []byte{0, 0, 0, 0, 0 ,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0})}

three. Define blockchain and method

package blctype blockchain struct {   blocks []*block //stores an ordered chunk} func  (Blc *blockchain) addblockchain (data string,height int64,prehash []byte) {    //Create new block    newblock := newblock (Data,height,prehash)    // Add chunk    BLC to the chain. Blocks=append (BLC. Blocks,newblock)}//1. Creating Blockchain with Genesis blocks Func createblockchainwithgenesisblock ()  *BlockChain {    //Creating the Genesis Block    genesisblock := creategenesisblock ("Genesis Data ...")    //return the Blockchain Object    return &blockchain{[]*block{genesisblock}}} 

four. Help code base

package blcimport  (    "bytes"     "Encoding/binary"     " Log ")//convert Int64 to byte array Func inttohex (Num int64)  []byte {   buff :=  New (bytes. Buffer)    err := binary. Write (buff, binary. Bigendian, num)    if err != nil {       Log. Panic (Err)    }   return buff. Bytes ()} 

five. Test code

package mainimport  (    "PUBLICCHAIN/BLC"     "FMT") Func main ()  {   //Create the Genesis block    BLOCKCHAIN := BLC. Createblockchainwithgenesisblock ()    //creates a new chunk    blockchain.addblockchain ("Send  $100 to bruce ",  blockchain.blocks[len (Blockchain.blocks)-1]. Height+1, blockchain.blocks[len (Blockchain.blocks)-1]. Hash)    blockchain.addblockchain ("Send $200 to apple",  blockChain.Blocks[ Len (Blockchain.blocks)-1]. Height+1, blockchain.blocks[len (Blockchain.blocks)-1]. Hash)    blockchain.addblockchain ("Send $300 to alice",  blockChain.Blocks[ Len (Blockchain.blocks)-1]. Height+1, blockchain.blocks[len (Blockchain.blocks)-1]. Hash)    blockchain.addblockchain ("Send $400 to bob",  blockchain.blocks[len ( Blockchain.blocks)-1]. Height+1, blockchain.blocks[len (BLOCKCHAIN.BLocks)-1]. Hash)    fmt. Printf ("Created Blockchain: \t%v\n",  blockchain)    fmt. Printf ("Blockchain-stored chunks: \t%v\n",  blockchain.blocks)    fmt. PRINTF ("Data information for the second chunk (trading information) is: \t%v\n",  string (blockchain.blocks[1). Data)}

six. The results show that