80 lines
1.5 KiB
Go
80 lines
1.5 KiB
Go
package main
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import (
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"flag"
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"fmt"
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"os"
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"strconv"
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)
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type CLI struct {
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bc *Blockchain
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}
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func (cli *CLI) printUsage() {
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fmt.Println("Usage:")
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fmt.Println("\taddblock -data BLOCK_DATA\tadd a block to the blockchain")
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fmt.Println("\tprintchain\t\t\tprint all the blocks of the blockchain")
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}
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func (cli *CLI) validateArgs() {
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if len(os.Args) < 2 {
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cli.printUsage()
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os.Exit(1)
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}
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}
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func (cli *CLI) Run() {
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cli.validateArgs()
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// Valid CLI flags
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addBlockCmd := flag.NewFlagSet("addblock", flag.ExitOnError)
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printChainCmd := flag.NewFlagSet("printchain", flag.ExitOnError)
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// CLI Flag Data
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addBlockData := addBlockCmd.String("data", "", "Block data")
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switch os.Args[1] {
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case "addblock":
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addBlockCmd.Parse(os.Args[2:])
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case "printchain":
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printChainCmd.Parse(os.Args[2:])
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default:
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cli.printUsage()
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os.Exit(1)
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}
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if addBlockCmd.Parsed() {
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if *addBlockData == "" {
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addBlockCmd.Usage()
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os.Exit(1)
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}
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cli.addBlock(*addBlockData)
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}
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if printChainCmd.Parsed() {
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cli.printChain()
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}
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}
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func (cli *CLI) addBlock(data string) {
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cli.bc.AddBlock(data)
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fmt.Println("Success!")
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}
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func (cli *CLI) printChain() {
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bci := cli.bc.Iterator()
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for {
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block := bci.Next()
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fmt.Printf("Prev. hash: %x\n", block.PrevBlockHash)
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fmt.Printf("Data: %s\n", block.Data)
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fmt.Printf("Hash: %x\n", block.Hash)
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pow := NewProofOfWork(block)
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fmt.Printf("PoW: %s\n", strconv.FormatBool(pow.Validate()))
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fmt.Println()
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if len(block.PrevBlockHash) == 0 {
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break
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}
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}
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}
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