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main.go
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main.go
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package main
import (
"flag"
"fmt"
"os"
"runtime"
"strconv"
)
type CommandLine struct {
blockchain *BlockChain
}
func (cli *CommandLine) printUsage() {
fmt.Println("Usage:")
fmt.Println(" add -block BLOCK_DATA - add a block to the chain")
fmt.Println(" print - Prints the blocks in the chain")
}
func (cli *CommandLine) validateArgs() {
if len(os.Args) < 2 {
cli.printUsage()
runtime.Goexit()
}
}
func (cli *CommandLine) addBlock(data string) {
cli.blockchain.AddBlock(data)
fmt.Println("Added Block!")
}
func (cli *CommandLine) printChain() {
iter := cli.blockchain.Iterator()
for {
block := iter.Next()
fmt.Printf("Prev. hash: %x\n", block.PrevHash)
fmt.Printf("Data: %s\n", block.Data)
fmt.Printf("Hash: %x\n", block.Hash)
pow := NewProofOfWork(block)
fmt.Printf("PoW: %s\n", strconv.FormatBool(pow.Validate()))
fmt.Println()
if len(block.PrevHash) == 0 {
break
}
}
}
func (cli *CommandLine) run() {
cli.validateArgs()
addBlockCmd := flag.NewFlagSet("add", flag.ExitOnError)
printChainCmd := flag.NewFlagSet("print", flag.ExitOnError)
addBlockData := addBlockCmd.String("block", "", "Block data")
switch os.Args[1] {
case "add":
err := addBlockCmd.Parse(os.Args[2:])
Handle(err)
case "print":
err := printChainCmd.Parse(os.Args[2:])
Handle(err)
default:
cli.printUsage()
runtime.Goexit()
}
if addBlockCmd.Parsed() {
if *addBlockData == "" {
addBlockCmd.Usage()
runtime.Goexit()
}
cli.addBlock(*addBlockData)
}
if printChainCmd.Parsed() {
cli.printChain()
}
}
func main() {
defer os.Exit(0)
chain := InitBlockChain()
defer chain.Database.Close()
cli := CommandLine{chain}
cli.run()
}