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main.go
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main.go
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package main
import (
"fmt"
"github.com/marc-baude/go-blockchain"
"log"
"os"
"runtime"
"strconv"
)
type CommandLine struct {
}
func (cli *CommandLine) printUsage() {
fmt.Println("Usage:")
fmt.Println(" getbalance -adress ADDRESS - get the balance of a specific address")
fmt.Println(" createblockchain -address ADDRESS - creates a blockchain")
fmt.Println(" printchain - Prints the blocks in the chain")
fmt.Println(" send -from FROM -to TO - amount AMOUNT - Send amount of tokens from one to another address")
}
func (cli *CommandLine) validateArgs() {
if len(os.Args) < 2 {
cli.printUsage()
runtime.Goexit()
}
}
func (cli *CommandLine) printChain() {
chain := blockchain.ContinueBlockChain("")
defer chain.Database.Close()
iter := chain.Iterator()
for {
block := iter.Next()
fmt.Printf("Prev. hash: %x\n", block.PrevHash)
fmt.Printf("Hash: %x\n", block.Hash)
pow := blockchain.NewProof(block)
fmt.Printf("PoW: %s\n", strconv.FormatBool(pow.Validate()))
fmt.Println()
if len(block.PrevHash) == 0 {
break
}
}
}
func (cli *CommandLine) createBlockChain(address string) {
chain := blockchain.InitBlockChain(address)
chain.Database.Close()
fmt.Println("Finished!")
}
func (cli *CommandLine) getBalance(address string) {
chain := blockchain.ContinueBlockChain(address)
defer chain.Database.Close()
balance := 0
UTXOs := chain.FindUTXO(address)
for _, out := range UTXOs {
balance += out.Value
}
fmt.Printf("Balance of %s: %d\n", address, balance)
}
func (cli *CommandLine) send(from, to string, amount int) {
chain := blockchain.ContinueBlockChain(from)
defer chain.Database.Close()
tx := blockchain.NewTransaction(from, to, amount, chain)
chain.AddBlock([]*blockchain.Transaction{tx})
fmt.Println("Success!")
}
func (cli *CommandLine) run() {
cli.validateArgs()
getBalanceCmd := flag.NewFlagSet("getbalance", flag.ExitOnError)
createBlockchainCmd := flag.NewFlagSet("createblockchain", flag.ExitOnError)
sendCmd := flag.NewFlagSet("send", flag.ExitOnError)
printChainCmd := flag.NewFlagSet("printchain", flag.ExitOnError)
getBalanceAddress := getBalanceCmd.String("address", "", "The address to get balance for")
createBlockchainAddress := createBlockchainCmd.String("address", "", "The address to send genesis block reward to")
sendFrom := sendCmd.String("from", "", "Source wallet address")
sendTo := sendCmd.String("to", "", "Destination wallet address")
sendAmount := sendCmd.Int("amount", 0, "Amount to send")
switch os.Args[1] {
case "getbalance":
err := getBalanceCmd.Parse(os.Args[2:])
if err != nil {
log.Panic(err)
}
case "createblockchain":
err := createBlockchainCmd.Parse(os.Args[2:])
if err != nil {
log.Panic(err)
}
case "printchain":
err := printChainCmd.Parse(os.Args[2:])
if err != nil {
log.Panic(err)
}
case "send":
err := sendCmd.Parse(os.Args[2:])
if err != nil {
log.Panic(err)
}
default:
cli.printUsage()
runtime.Goexit()
}
if getBalanceCmd.Parsed() {
if *getBalanceAddress == "" {
getBalanceCmd.Usage()
runtime.Goexit()
}
cli.getBalance(*getBalanceAddress)
}
if createBlockchainCmd.Parsed() {
if *createBlockchainAddress == "" {
createBlockchainCmd.Usage()
runtime.Goexit()
}
cli.createBlockChain(*createBlockchainAddress)
}
if printChainCmd.Parsed() {
cli.printChain()
}
if sendCmd.Parsed() {
if *sendFrom == "" || *sendTo == "" || *sendAmount <= 0 {
sendCmd.Usage()
runtime.Goexit()
}
cli.send(*sendFrom, *sendTo, *sendAmount)
}
}
func main() {
fmt.Println("Blockchain v.0.0.1")
defer os.Exit(0)
cli := CommandLine{}
cli.run()
}