Add core blockchain

.gitignore

@@ -1,3 +1,5 @@
 blockchain-project
 .vscode/
-core/core
+core/core
+/target
+**/*.rs.bk

Cargo.lock

@@ -0,0 +1,4 @@
+[[package]]
+name = "blockchain-project"
+version = "0.1.0"
+

Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "blockchain-project"
+version = "0.1.0"
+authors = ["garritfra <garritfranke@gmail.com>"]
+
+[dependencies]

core/Block.go

@@ -1,14 +0,0 @@
-package core
-
-import (
-	"time"
-)
-
-// Block Struct
-type Block struct {
-	Timestamp    time.Time
-	Hash         string
-	PreviousHash string
-	Data         []Transaction
-	Nonce        int
-}

core/Blockchain.go

@@ -1,67 +0,0 @@
-package core
-
-import (
-	"log"
-	"strings"
-	"time"
-
-	"github.com/garritfra/blockchain-project/crypto"
-)
-
-// Blockchain struct
-type Blockchain struct {
-	Blocks              []Block
-	PendingTransactions []Transaction
-}
-
-// MineBlock adds a block to the chain
-func (bc *Blockchain) MineBlock() Block {
-	block := Block{}
-	block.Data = bc.PendingTransactions
-	block.Timestamp = time.Now()
-	block.PreviousHash = bc.GetLastHash()
-	// Mine Block
-	log.Print("Mining Block...")
-	for {
-		hash := crypto.CalculateHash(block)
-		if strings.HasPrefix(hash, "00000") {
-			block.Hash = hash
-
-			bc.Blocks = append(bc.Blocks, block)
-			bc.PendingTransactions = []Transaction{}
-
-			log.Print("Block Added: ", block.Hash)
-			return block
-		}
-		block.Nonce++
-	}
-
-}
-
-// NewBlockchain creates a new Blockchain
-func NewBlockchain() Blockchain {
-	log.Print("Creating Blockchain...")
-
-	blockchain := Blockchain{Blocks: make([]Block, 0), PendingTransactions: make([]Transaction, 0)}
-
-	// Mine Genesis Block
-	blockchain.MineBlock()
-	return blockchain
-}
-
-// AddTransaction takes in a transaction and adds it to the block
-func (bc *Blockchain) AddTransaction(transaction Transaction) error {
-	bc.PendingTransactions = append(bc.PendingTransactions, transaction)
-	return nil
-}
-
-// GetLastHash returns the hash of the latest block on the chain
-func (bc *Blockchain) GetLastHash() string {
-
-	bcLength := len(bc.Blocks)
-
-	if bcLength == 0 {
-		return "0"
-	}
-	return bc.Blocks[len(bc.Blocks)-1].Hash
-}

core/Transaction.go

@@ -1,9 +0,0 @@
-package core
-
-// Transaction struct
-type Transaction struct {
-	Sender   string
-	Receiver string
-	Amount   int
-	Message  string
-}

core/block_test.go

@@ -1,18 +0,0 @@
-package core
-
-import (
-	"testing"
-)
-
-func TestBlock_AddTransaction(t *testing.T) {
-	block := Block{}
-	transaction := Transaction{Sender: "foo", Receiver: "bar", Message: "Test", Amount: 100}
-	block.AddTransaction(transaction)
-
-	want := transaction
-	got := block.Data[0]
-
-	if want != got {
-		t.Errorf("Want: %v, but got %v", want, got)
-	}
-}

core/blockchain_test.go

@@ -1,32 +0,0 @@
-package core
-
-import (
-	"testing"
-)
-
-func Test_generateGenesisBlock(t *testing.T) {
-	genesisBlock := generateGenesisBlock()
-
-	if len(genesisBlock.PreviousHash) > 1 {
-		t.Errorf("Previous hash of Genesis Block is not empty!")
-	}
-}
-
-func TestNewBlockchain(t *testing.T) {
-	blockchain := NewBlockchain()
-
-	if len(blockchain.Blocks) != 1 {
-		t.Errorf("New Blockchain has too many Blocks (Besides Genesis)")
-	}
-}
-
-func TestBlockchain_GetLastHash(t *testing.T) {
-	blockchain := NewBlockchain()
-
-	blockchain.MineBlock(Block{})
-	want := blockchain.Blocks[1].Hash
-	got := blockchain.GetLastHash()
-	if got != want {
-		t.Errorf("Want: %v, but got %v", want, got)
-	}
-}

crypto/crypto.go

@@ -1,23 +0,0 @@
-package crypto
-
-import (
-	"bytes"
-	"crypto/sha256"
-	"encoding/gob"
-	"encoding/hex"
-)
-
-func CalculateHash(obj interface{}) string {
-	var buffer bytes.Buffer
-	encoder := gob.NewEncoder(&buffer)
-	if err := encoder.Encode(obj); err != nil {
-		panic(err)
-	}
-	hasher := sha256.New()
-	bytes := buffer.Bytes()
-	hasher.Write(bytes)
-
-	sum := hex.EncodeToString(hasher.Sum(nil))
-
-	return string(sum)
-}

main.go

@@ -1,9 +0,0 @@
-package main
-
-import (
-	"github.com/garritfra/blockchain-project/server"
-)
-
-func main() {
-	server.ServeHTTP(":42000")
-}

server/webserver.go

@@ -1,66 +0,0 @@
-package server
-
-import (
-	"encoding/gob"
-	"encoding/json"
-	"log"
-	"net/http"
-
-	"github.com/garritfra/blockchain-project/core"
-)
-
-var blockchain core.Blockchain
-
-// ServeHTTP serves a http server on a given port with format ":PORT"
-func ServeHTTP(port string) {
-	gob.Register(core.Block{})
-	gob.Register(core.Transaction{})
-	gob.Register(core.Blockchain{})
-
-	blockchain = core.NewBlockchain()
-
-	registerRouteHandlers()
-
-	log.Print("Listening on port ", port)
-	if err := http.ListenAndServe(port, nil); err != nil {
-		panic(err)
-	}
-}
-
-func registerRouteHandlers() {
-	http.HandleFunc("/", handleListBlocks)
-	http.HandleFunc("/mine_block", handleMineBlock)
-	http.HandleFunc("/pending_transactions", handleListPendingTransactions)
-	http.HandleFunc("/add_transaction", handleAddTransaction)
-}
-
-func handleError(err error, w http.ResponseWriter, r *http.Request) {
-	w.Write([]byte("Error: " + err.Error()))
-	log.Print(err.Error())
-}
-
-func handleListBlocks(w http.ResponseWriter, r *http.Request) {
-	json.NewEncoder(w).Encode(blockchain.Blocks)
-}
-
-func handleAddTransaction(w http.ResponseWriter, r *http.Request) {
-	decoder := json.NewDecoder(r.Body)
-	var receivedTransaction core.Transaction
-	err := decoder.Decode(&receivedTransaction)
-	if err == nil {
-		log.Println("Transaction from", receivedTransaction.Sender, "to", receivedTransaction.Receiver, "received")
-
-		go blockchain.AddTransaction(receivedTransaction)
-	} else {
-		handleError(err, w, r)
-	}
-}
-
-func handleMineBlock(w http.ResponseWriter, r *http.Request) {
-	block := blockchain.MineBlock()
-	json.NewEncoder(w).Encode(block)
-}
-
-func handleListPendingTransactions(w http.ResponseWriter, r *http.Request) {
-	json.NewEncoder(w).Encode(blockchain.PendingTransactions)
-}

src/core/blockchain.rs

@@ -0,0 +1,27 @@
+pub struct Block {
+  pub data: i32,
+}
+
+pub struct Blockchain {
+  blocks: Vec<Block>,
+}
+pub fn new() -> Blockchain {
+  println!("New blockchain\n");
+
+  let genesis = Block { data: 32 };
+
+  let blockchain = Blockchain {
+    blocks: vec![genesis],
+  };
+  return blockchain;
+}
+
+impl Blockchain {
+  pub fn addBlock(&mut self, block: Block) {
+    self.blocks.push(block);
+  }
+
+  pub fn getBlocks(&mut self) -> &Vec<Block> {
+    &self.blocks
+  }
+}

src/core/mod.rs

@@ -0,0 +1 @@
+pub mod blockchain;

src/main.rs

@@ -0,0 +1,11 @@
+mod core;
+
+fn main() {
+    let mut blockchain = core::blockchain::new();
+    let block = core::blockchain::Block { data: 42 };
+    blockchain.addBlock(block);
+
+    for block in blockchain.getBlocks() {
+        println!("{}", block.data);
+    }
+}