From c344c77d2924cde119efaeb57b4d3e33049e7896 Mon Sep 17 00:00:00 2001
From: StephenButtolph <stephen@avalabs.org>
Date: Wed, 15 Apr 2020 00:10:02 -0400
Subject: Added the EVM as a plugin

---
 plugin/evm/service.go | 122 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 plugin/evm/service.go

(limited to 'plugin/evm/service.go')

diff --git a/plugin/evm/service.go b/plugin/evm/service.go
new file mode 100644
index 0000000..70135cc
--- /dev/null
+++ b/plugin/evm/service.go
@@ -0,0 +1,122 @@
+// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+package evm
+
+import (
+	"context"
+	"crypto/rand"
+	"fmt"
+	"math/big"
+
+	"github.com/ava-labs/coreth"
+
+	"github.com/ava-labs/go-ethereum/common"
+	"github.com/ava-labs/go-ethereum/common/hexutil"
+	"github.com/ava-labs/go-ethereum/core/types"
+	"github.com/ava-labs/go-ethereum/crypto"
+)
+
+const (
+	version = "Athereum 1.0"
+)
+
+// test constants
+const (
+	GenesisTestAddr = "0x751a0b96e1042bee789452ecb20253fba40dbe85"
+	GenesisTestKey  = "0xabd71b35d559563fea757f0f5edbde286fb8c043105b15abb7cd57189306d7d1"
+)
+
+// DebugAPI introduces helper functions for debuging
+type DebugAPI struct{ vm *VM }
+
+// SnowmanAPI introduces snowman specific functionality to the evm
+type SnowmanAPI struct{ vm *VM }
+
+// NetAPI offers network related API methods
+type NetAPI struct{ vm *VM }
+
+// NewNetAPI creates a new net API instance.
+func NewNetAPI(vm *VM) *NetAPI { return &NetAPI{vm} }
+
+// Listening returns an indication if the node is listening for network connections.
+func (s *NetAPI) Listening() bool { return true } // always listening
+
+// PeerCount returns the number of connected peers
+func (s *NetAPI) PeerCount() hexutil.Uint { return hexutil.Uint(0) } // TODO: report number of connected peers
+
+// Version returns the current ethereum protocol version.
+func (s *NetAPI) Version() string { return fmt.Sprintf("%d", s.vm.networkID) }
+
+// Web3API offers helper API methods
+type Web3API struct{}
+
+// ClientVersion returns the version of the vm running
+func (s *Web3API) ClientVersion() string { return version }
+
+// Sha3 returns the bytes returned by hashing [input] with Keccak256
+func (s *Web3API) Sha3(input hexutil.Bytes) hexutil.Bytes { return crypto.Keccak256(input) }
+
+// GetAcceptedFrontReply defines the reply that will be sent from the
+// GetAcceptedFront API call
+type GetAcceptedFrontReply struct {
+	Hash   common.Hash `json:"hash"`
+	Number *big.Int    `json:"number"`
+}
+
+// GetAcceptedFront returns the last accepted block's hash and height
+func (api *SnowmanAPI) GetAcceptedFront(ctx context.Context) (*GetAcceptedFrontReply, error) {
+	blk := api.vm.getLastAccepted().ethBlock
+	return &GetAcceptedFrontReply{
+		Hash:   blk.Hash(),
+		Number: blk.Number(),
+	}, nil
+}
+
+// GetGenesisBalance returns the current funds in the genesis
+func (api *DebugAPI) GetGenesisBalance(ctx context.Context) (*hexutil.Big, error) {
+	lastAccepted := api.vm.getLastAccepted()
+	api.vm.ctx.Log.Verbo("Currently accepted block front: %s", lastAccepted.ethBlock.Hash().Hex())
+	state, err := api.vm.chain.BlockState(lastAccepted.ethBlock)
+	if err != nil {
+		return nil, err
+	}
+	return (*hexutil.Big)(state.GetBalance(common.HexToAddress(GenesisTestAddr))), nil
+}
+
+// SpendGenesis funds
+func (api *DebugAPI) SpendGenesis(ctx context.Context, nonce uint64) error {
+	api.vm.ctx.Log.Info("Spending the genesis")
+
+	value := big.NewInt(1000000000000)
+	gasLimit := 21000
+	gasPrice := big.NewInt(1000000000)
+
+	genPrivateKey, err := crypto.HexToECDSA(GenesisTestKey[2:])
+	if err != nil {
+		return err
+	}
+	bob, err := coreth.NewKey(rand.Reader)
+	if err != nil {
+		return err
+	}
+
+	tx := types.NewTransaction(nonce, bob.Address, value, uint64(gasLimit), gasPrice, nil)
+	signedTx, err := types.SignTx(tx, types.NewEIP155Signer(api.vm.chainID), genPrivateKey)
+	if err != nil {
+		return err
+	}
+
+	if err := api.vm.issueRemoteTxs([]*types.Transaction{signedTx}); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// IssueBlock to the chain
+func (api *DebugAPI) IssueBlock(ctx context.Context) error {
+	api.vm.ctx.Log.Info("Issuing a new block")
+
+	return api.vm.tryBlockGen()
+}
-- 
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