add smart contract example

4 files changed, 173 insertions, 2 deletions

diff --git a/coreth.go b/coreth.go
index 84a6b59..a164452 100644
--- a/coreth.go
+++ b/coreth.go
@@ -106,6 +106,10 @@ func (self *ETHChain) SetHead(hash common.Hash) error {
 	return self.backend.BlockChain().FastSyncCommitHead(hash)
 }
 
+func (self *ETHChain) GetReceiptsByHash(hash common.Hash) types.Receipts {
+	return self.backend.BlockChain().GetReceiptsByHash(hash)
+}
+
 type Key struct {
 	Address    common.Address
 	PrivateKey *ecdsa.PrivateKey
diff --git a/examples/counter/counter.sol b/examples/counter/counter.sol
new file mode 100644
index 0000000..c05bf23
--- /dev/null
+++ b/examples/counter/counter.sol
@@ -0,0 +1,14 @@
+pragma solidity ^0.5.10;
+
+contract Counter {
+    uint256 x;
+
+    constructor() public {
+        x = 42;
+    }
+
+    function add(uint256 y) public returns (uint256) {
+        x = x + y;
+        return x;
+    }
+}
diff --git a/examples/counter/main.go b/examples/counter/main.go
new file mode 100644
index 0000000..662fea1
--- /dev/null
+++ b/examples/counter/main.go
@@ -0,0 +1,153 @@
+package main
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"fmt"
+	"github.com/ava-labs/coreth"
+	"github.com/ava-labs/coreth/eth"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/compiler"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/core"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/params"
+	"math/big"
+	"os"
+	"os/signal"
+	"path/filepath"
+	"syscall"
+	"time"
+)
+
+func checkError(err error) {
+	if err != nil {
+		panic(err)
+	}
+}
+
+func main() {
+	// configure the chain
+	config := eth.DefaultConfig
+	chainConfig := &params.ChainConfig{
+		ChainID:             big.NewInt(1),
+		HomesteadBlock:      big.NewInt(0),
+		DAOForkBlock:        big.NewInt(0),
+		DAOForkSupport:      true,
+		EIP150Block:         big.NewInt(0),
+		EIP150Hash:          common.HexToHash("0x2086799aeebeae135c246c65021c82b4e15a2c451340993aacfd2751886514f0"),
+		EIP155Block:         big.NewInt(0),
+		EIP158Block:         big.NewInt(0),
+		ByzantiumBlock:      big.NewInt(0),
+		ConstantinopleBlock: big.NewInt(0),
+		PetersburgBlock:     big.NewInt(0),
+		IstanbulBlock:       nil,
+		Ethash:              nil,
+	}
+
+	// configure the genesis block
+	genBalance := big.NewInt(100000000000000000)
+	genKey, _ := coreth.NewKey(rand.Reader)
+
+	config.Genesis = &core.Genesis{
+		Config:     chainConfig,
+		Nonce:      0,
+		Number:     0,
+		ExtraData:  hexutil.MustDecode("0x00"),
+		GasLimit:   100000000,
+		Difficulty: big.NewInt(0),
+		Alloc:      core.GenesisAlloc{genKey.Address: {Balance: genBalance}},
+	}
+
+	// grab the control of block generation and disable auto uncle
+	config.Miner.ManualMining = true
+	config.Miner.ManualUncle = true
+
+	// compile the smart contract
+	counterSrc, err := filepath.Abs("./counter.sol")
+	checkError(err)
+	contracts, err := compiler.CompileSolidity("", counterSrc)
+	checkError(err)
+	contract, _ := contracts[fmt.Sprintf("%s:%s", counterSrc, "Counter")]
+
+	// info required to generate a transaction
+	chainID := chainConfig.ChainID
+	nonce := uint64(0)
+	gasLimit := 10000000
+	gasPrice := big.NewInt(1000000000)
+
+	blockCount := 0
+	chain := coreth.NewETHChain(&config, nil)
+	firstBlock := false
+	var contractAddr common.Address
+	postGen := func(block *types.Block) bool {
+		if blockCount == 15 {
+			state, err := chain.CurrentState()
+			checkError(err)
+			log.Info(fmt.Sprintf("genesis balance = %s", state.GetBalance(genKey.Address)))
+			log.Info(fmt.Sprintf("contract balance = %s", state.GetBalance(contractAddr)))
+			log.Info(fmt.Sprintf("state = %s", state.Dump(true, false, true)))
+			log.Info(fmt.Sprintf("x = %s", state.GetState(contractAddr, common.BigToHash(big.NewInt(0))).String()))
+			return true
+		}
+		if !firstBlock {
+			firstBlock = true
+			receipts := chain.GetReceiptsByHash(block.Hash())
+			if len(receipts) != 1 {
+				panic("# receipts is not 1")
+			}
+			contractAddr = receipts[0].ContractAddress
+			txHash := receipts[0].TxHash
+			log.Info(fmt.Sprintf("deploy tx = %s", txHash.String()))
+			log.Info(fmt.Sprintf("contract addr = %s", contractAddr.String()))
+			call := common.Hex2Bytes("1003e2d20000000000000000000000000000000000000000000000000000000000000001")
+			state, _ := chain.CurrentState()
+			log.Info(fmt.Sprintf("code = %s", hex.EncodeToString(state.GetCode(contractAddr))))
+			go func() {
+				for i := 0; i < 10; i++ {
+					tx := types.NewTransaction(nonce, contractAddr, big.NewInt(0), uint64(gasLimit), gasPrice, call)
+					signedTx, err := types.SignTx(tx, types.NewEIP155Signer(chainID), genKey.PrivateKey)
+					checkError(err)
+					chain.AddRemoteTxs([]*types.Transaction{signedTx})
+					time.Sleep(1000 * time.Millisecond)
+					nonce++
+				}
+			}()
+		}
+		return false
+	}
+	chain.SetOnSeal(func(block *types.Block) error {
+		go func() {
+			// the minimum time gap is 1s
+			time.Sleep(1000 * time.Millisecond)
+			// generate 15 blocks
+			blockCount++
+			if postGen(block) {
+				return
+			}
+			chain.GenBlock()
+		}()
+		return nil
+	})
+
+	// start the chain
+	chain.Start()
+
+	_ = contract
+	code := common.Hex2Bytes(contract.Code[2:])
+	tx := types.NewContractCreation(nonce, big.NewInt(0), uint64(gasLimit), gasPrice, code)
+	signedTx, err := types.SignTx(tx, types.NewEIP155Signer(chainID), genKey.PrivateKey)
+	checkError(err)
+	chain.AddRemoteTxs([]*types.Transaction{signedTx})
+	time.Sleep(1000 * time.Millisecond)
+	nonce++
+
+	chain.GenBlock()
+
+	c := make(chan os.Signal, 1)
+	signal.Notify(c, os.Interrupt, syscall.SIGTERM)
+	signal.Notify(c, os.Interrupt, syscall.SIGINT)
+	<-c
+	chain.Stop()
+}
diff --git a/examples/payments/main.go b/examples/payments/main.go
index 1c0a18e..db43319 100644
--- a/examples/payments/main.go
+++ b/examples/payments/main.go
@@ -76,8 +76,8 @@ func main() {
 	showBalance := func() {
 		state, err := chain.CurrentState()
 		checkError(err)
-		log.Info(fmt.Sprintf("genesis balanche = %s", state.GetBalance(genKey.Address)))
-		log.Info(fmt.Sprintf("bob's balanche = %s", state.GetBalance(bob.Address)))
+		log.Info(fmt.Sprintf("genesis balance = %s", state.GetBalance(genKey.Address)))
+		log.Info(fmt.Sprintf("bob's balance = %s", state.GetBalance(bob.Address)))
 	}
 	chain.SetOnSeal(func(block *types.Block) error {
 		go func() {