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main.go
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main.go
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package main
import (
"flag"
"fmt"
"github.com/udayangaac/blockchain/blockchain"
"os"
"runtime"
"strconv"
)
type CommandLine struct {
blockChain *blockchain.BlockChain
}
func (cli *CommandLine) printUsage() {
fmt.Println(" Usage:")
fmt.Println(" add -block BLOCK_DATA - add a block to chain")
fmt.Println(" print - Print 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("Data : %s\n", block.Data)
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 {
}
}
}
func (cli *CommandLine) run() {
cli.validateArgs()
addBlockCmd := flag.NewFlagSet("add", flag.ExitOnError)
printChainCmd := flag.NewFlagSet("print", flag.ExitOnError)
addBlockData := addBlockCmd.String("block", "", "Block data")
val := os.Args[1]
fmt.Printf("Console Command : %v\n", val)
switch val {
case "add":
err := addBlockCmd.Parse(os.Args[2:])
blockchain.ErrorHandle(err)
case "print":
err := printChainCmd.Parse(os.Args[2:])
blockchain.ErrorHandle(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 := blockchain.InitBlockChain()
defer func() {
err := chain.Database.Close()
blockchain.ErrorHandle(err)
}()
cli := CommandLine{blockChain: chain}
cli.run()
}