Merge pull request #4 from ava-labs/revert-2-plugin

Revert "Added the EVM as a plugin"

1 files changed, 0 insertions, 502 deletions

diff --git a/plugin/evm/vm.go b/plugin/evm/vm.go
deleted file mode 100644
index a9011ea..0000000
--- a/plugin/evm/vm.go
+++ /dev/null
@@ -1,502 +0,0 @@
-// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
-// See the file LICENSE for licensing terms.
-
-package evm
-
-import (
-	"crypto/rand"
-	"encoding/json"
-	"errors"
-	"fmt"
-	"math/big"
-	"sync"
-	"sync/atomic"
-	"time"
-
-	"github.com/ava-labs/coreth"
-	"github.com/ava-labs/coreth/core"
-	"github.com/ava-labs/coreth/eth"
-	"github.com/ava-labs/coreth/node"
-
-	"github.com/ava-labs/go-ethereum/common"
-	"github.com/ava-labs/go-ethereum/core/types"
-	"github.com/ava-labs/go-ethereum/rlp"
-	"github.com/ava-labs/go-ethereum/rpc"
-
-	"github.com/ava-labs/gecko/cache"
-	"github.com/ava-labs/gecko/database"
-	"github.com/ava-labs/gecko/ids"
-	"github.com/ava-labs/gecko/snow"
-	"github.com/ava-labs/gecko/snow/choices"
-	"github.com/ava-labs/gecko/snow/consensus/snowman"
-	"github.com/ava-labs/gecko/utils/timer"
-
-	commonEng "github.com/ava-labs/gecko/snow/engine/common"
-)
-
-const (
-	lastAcceptedKey = "snowman_lastAccepted"
-)
-
-const (
-	minBlockTime = 250 * time.Millisecond
-	maxBlockTime = 1000 * time.Millisecond
-	batchSize    = 250
-)
-
-const (
-	bdTimerStateMin = iota
-	bdTimerStateMax
-	bdTimerStateLong
-)
-
-var (
-	errEmptyBlock     = errors.New("empty block")
-	errCreateBlock    = errors.New("couldn't create block")
-	errUnknownBlock   = errors.New("unknown block")
-	errBlockFrequency = errors.New("too frequent block issuance")
-	errUnsupportedFXs = errors.New("unsupported feature extensions")
-)
-
-func maxDuration(x, y time.Duration) time.Duration {
-	if x > y {
-		return x
-	}
-	return y
-}
-
-// VM implements the snowman.ChainVM interface
-type VM struct {
-	ctx *snow.Context
-
-	chainID           *big.Int
-	networkID         uint64
-	chain             *coreth.ETHChain
-	chaindb           Database
-	newBlockChan      chan *Block
-	networkChan       chan<- commonEng.Message
-	newTxPoolHeadChan chan core.NewTxPoolHeadEvent
-
-	txPoolStabilizedHead common.Hash
-	txPoolStabilizedOk   chan struct{}
-	txPoolStabilizedLock sync.Mutex
-
-	metalock                     sync.Mutex
-	blockCache, blockStatusCache cache.LRU
-	lastAccepted                 *Block
-	writingMetadata              uint32
-
-	bdlock          sync.Mutex
-	blockDelayTimer *timer.Timer
-	bdTimerState    int8
-	bdGenWaitFlag   bool
-	bdGenFlag       bool
-
-	genlock      sync.Mutex
-	txSubmitChan <-chan struct{}
-}
-
-/*
- ******************************************************************************
- ********************************* Snowman API ********************************
- ******************************************************************************
- */
-
-// Initialize implements the snowman.ChainVM interface
-func (vm *VM) Initialize(
-	ctx *snow.Context,
-	db database.Database,
-	b []byte,
-	toEngine chan<- commonEng.Message,
-	fxs []*commonEng.Fx,
-) error {
-	if len(fxs) > 0 {
-		return errUnsupportedFXs
-	}
-
-	vm.ctx = ctx
-	vm.chaindb = Database{db}
-	g := new(core.Genesis)
-	err := json.Unmarshal(b, g)
-	if err != nil {
-		return err
-	}
-
-	vm.chainID = g.Config.ChainID
-
-	config := eth.DefaultConfig
-	config.ManualCanonical = true
-	config.Genesis = g
-	config.Miner.ManualMining = true
-	config.Miner.DisableUncle = true
-	if err := config.SetGCMode("archive"); err != nil {
-		panic(err)
-	}
-	nodecfg := node.Config{NoUSB: true}
-	chain := coreth.NewETHChain(&config, &nodecfg, nil, vm.chaindb)
-	vm.chain = chain
-	vm.networkID = config.NetworkId
-	chain.SetOnHeaderNew(func(header *types.Header) {
-		hid := make([]byte, 32)
-		_, err := rand.Read(hid)
-		if err != nil {
-			panic("cannot generate hid")
-		}
-		header.Extra = append(header.Extra, hid...)
-	})
-	chain.SetOnSeal(func(block *types.Block) error {
-		if len(block.Transactions()) == 0 {
-			// this could happen due to the async logic of geth tx pool
-			vm.newBlockChan <- nil
-			return errEmptyBlock
-		}
-		return nil
-	})
-	chain.SetOnSealFinish(func(block *types.Block) error {
-		vm.ctx.Log.Verbo("EVM sealed a block")
-
-		blk := &Block{
-			id:       ids.NewID(block.Hash()),
-			ethBlock: block,
-			vm:       vm,
-		}
-		vm.newBlockChan <- blk
-		vm.updateStatus(ids.NewID(block.Hash()), choices.Processing)
-		vm.txPoolStabilizedLock.Lock()
-		vm.txPoolStabilizedHead = block.Hash()
-		vm.txPoolStabilizedLock.Unlock()
-		return nil
-	})
-	chain.SetOnQueryAcceptedBlock(func() *types.Block {
-		return vm.getLastAccepted().ethBlock
-	})
-	vm.blockCache = cache.LRU{Size: 2048}
-	vm.blockStatusCache = cache.LRU{Size: 1024}
-	vm.newBlockChan = make(chan *Block)
-	vm.networkChan = toEngine
-	vm.blockDelayTimer = timer.NewTimer(func() {
-		vm.bdlock.Lock()
-		switch vm.bdTimerState {
-		case bdTimerStateMin:
-			vm.bdTimerState = bdTimerStateMax
-			vm.blockDelayTimer.SetTimeoutIn(maxDuration(maxBlockTime-minBlockTime, 0))
-		case bdTimerStateMax:
-			vm.bdTimerState = bdTimerStateLong
-		}
-		tryAgain := vm.bdGenWaitFlag
-		vm.bdlock.Unlock()
-		if tryAgain {
-			vm.tryBlockGen()
-		}
-	})
-	go ctx.Log.RecoverAndPanic(vm.blockDelayTimer.Dispatch)
-
-	vm.bdTimerState = bdTimerStateLong
-	vm.bdGenWaitFlag = true
-	vm.newTxPoolHeadChan = make(chan core.NewTxPoolHeadEvent, 1)
-	vm.txPoolStabilizedOk = make(chan struct{}, 1)
-	chain.GetTxPool().SubscribeNewHeadEvent(vm.newTxPoolHeadChan)
-	// TODO: shutdown this go routine
-	go ctx.Log.RecoverAndPanic(func() {
-		for {
-			select {
-			case h := <-vm.newTxPoolHeadChan:
-				vm.txPoolStabilizedLock.Lock()
-				if vm.txPoolStabilizedHead == h.Block.Hash() {
-					vm.txPoolStabilizedOk <- struct{}{}
-					vm.txPoolStabilizedHead = common.Hash{}
-				}
-				vm.txPoolStabilizedLock.Unlock()
-			}
-		}
-	})
-	chain.Start()
-
-	var lastAccepted *types.Block
-	if b, err := vm.chaindb.Get([]byte(lastAcceptedKey)); err == nil {
-		var hash common.Hash
-		if err = rlp.DecodeBytes(b, &hash); err == nil {
-			if block := chain.GetBlockByHash(hash); block == nil {
-				vm.ctx.Log.Debug("lastAccepted block not found in chaindb")
-			} else {
-				lastAccepted = block
-			}
-		}
-	}
-	if lastAccepted == nil {
-		vm.ctx.Log.Debug("lastAccepted is unavailable, setting to the genesis block")
-		lastAccepted = chain.GetGenesisBlock()
-	}
-	vm.lastAccepted = &Block{
-		id:       ids.NewID(lastAccepted.Hash()),
-		ethBlock: lastAccepted,
-		vm:       vm,
-	}
-	vm.ctx.Log.Info(fmt.Sprintf("lastAccepted = %s", vm.lastAccepted.ethBlock.Hash().Hex()))
-
-	// TODO: shutdown this go routine
-	go vm.ctx.Log.RecoverAndPanic(func() {
-		vm.txSubmitChan = vm.chain.GetTxSubmitCh()
-		for {
-			select {
-			case <-vm.txSubmitChan:
-				vm.ctx.Log.Verbo("New tx detected, trying to generate a block")
-				vm.tryBlockGen()
-			case <-time.After(5 * time.Second):
-				vm.tryBlockGen()
-			}
-		}
-	})
-
-	return nil
-}
-
-// Shutdown implements the snowman.ChainVM interface
-func (vm *VM) Shutdown() {
-	if vm.ctx == nil {
-		return
-	}
-
-	vm.writeBackMetadata()
-	vm.chain.Stop()
-}
-
-// BuildBlock implements the snowman.ChainVM interface
-func (vm *VM) BuildBlock() (snowman.Block, error) {
-	vm.chain.GenBlock()
-	block := <-vm.newBlockChan
-	if block == nil {
-		return nil, errCreateBlock
-	}
-	// reset the min block time timer
-	vm.bdlock.Lock()
-	vm.bdTimerState = bdTimerStateMin
-	vm.bdGenWaitFlag = false
-	vm.bdGenFlag = false
-	vm.blockDelayTimer.SetTimeoutIn(minBlockTime)
-	vm.bdlock.Unlock()
-
-	vm.ctx.Log.Debug("built block 0x%x", block.ID().Bytes())
-	// make sure Tx Pool is updated
-	<-vm.txPoolStabilizedOk
-	return block, nil
-}
-
-// ParseBlock implements the snowman.ChainVM interface
-func (vm *VM) ParseBlock(b []byte) (snowman.Block, error) {
-	vm.metalock.Lock()
-	defer vm.metalock.Unlock()
-
-	ethBlock := new(types.Block)
-	if err := rlp.DecodeBytes(b, ethBlock); err != nil {
-		return nil, err
-	}
-	block := &Block{
-		id:       ids.NewID(ethBlock.Hash()),
-		ethBlock: ethBlock,
-		vm:       vm,
-	}
-	vm.blockCache.Put(block.ID(), block)
-	return block, nil
-}
-
-// GetBlock implements the snowman.ChainVM interface
-func (vm *VM) GetBlock(id ids.ID) (snowman.Block, error) {
-	vm.metalock.Lock()
-	defer vm.metalock.Unlock()
-
-	block := vm.getBlock(id)
-	if block == nil {
-		return nil, errUnknownBlock
-	}
-	return block, nil
-}
-
-// SetPreference sets what the current tail of the chain is
-func (vm *VM) SetPreference(blkID ids.ID) {
-	err := vm.chain.SetTail(blkID.Key())
-	vm.ctx.Log.AssertNoError(err)
-}
-
-// LastAccepted returns the ID of the block that was last accepted
-func (vm *VM) LastAccepted() ids.ID {
-	vm.metalock.Lock()
-	defer vm.metalock.Unlock()
-
-	return vm.lastAccepted.ID()
-}
-
-// CreateHandlers makes new http handlers that can handle API calls
-func (vm *VM) CreateHandlers() map[string]*commonEng.HTTPHandler {
-	handler := vm.chain.NewRPCHandler()
-	vm.chain.AttachEthService(handler, []string{"eth", "personal", "txpool"})
-	handler.RegisterName("net", &NetAPI{vm})
-	handler.RegisterName("snowman", &SnowmanAPI{vm})
-	handler.RegisterName("web3", &Web3API{})
-	handler.RegisterName("debug", &DebugAPI{vm})
-
-	return map[string]*commonEng.HTTPHandler{
-		"/rpc": &commonEng.HTTPHandler{LockOptions: commonEng.NoLock, Handler: handler},
-		"/ws":  &commonEng.HTTPHandler{LockOptions: commonEng.NoLock, Handler: handler.WebsocketHandler([]string{"*"})},
-	}
-}
-
-// CreateStaticHandlers makes new http handlers that can handle API calls
-func (vm *VM) CreateStaticHandlers() map[string]*commonEng.HTTPHandler {
-	handler := rpc.NewServer()
-	handler.RegisterName("static", &StaticService{})
-	return map[string]*commonEng.HTTPHandler{
-		"/rpc": &commonEng.HTTPHandler{LockOptions: commonEng.NoLock, Handler: handler},
-		"/ws":  &commonEng.HTTPHandler{LockOptions: commonEng.NoLock, Handler: handler.WebsocketHandler([]string{"*"})},
-	}
-}
-
-/*
- ******************************************************************************
- *********************************** Helpers **********************************
- ******************************************************************************
- */
-
-func (vm *VM) updateStatus(blockID ids.ID, status choices.Status) {
-	vm.metalock.Lock()
-	defer vm.metalock.Unlock()
-
-	if status == choices.Accepted {
-		vm.lastAccepted = vm.getBlock(blockID)
-		// TODO: improve this naive implementation
-		if atomic.SwapUint32(&vm.writingMetadata, 1) == 0 {
-			go vm.ctx.Log.RecoverAndPanic(vm.writeBackMetadata)
-		}
-	}
-	vm.blockStatusCache.Put(blockID, status)
-}
-
-func (vm *VM) getCachedBlock(blockID ids.ID) *types.Block {
-	return vm.chain.GetBlockByHash(blockID.Key())
-}
-
-func (vm *VM) tryBlockGen() error {
-	vm.bdlock.Lock()
-	defer vm.bdlock.Unlock()
-	if vm.bdGenFlag {
-		// skip if one call already generates a block in this round
-		return nil
-	}
-	vm.bdGenWaitFlag = true
-
-	vm.genlock.Lock()
-	defer vm.genlock.Unlock()
-	// get pending size
-	size, err := vm.chain.PendingSize()
-	if err != nil {
-		return err
-	}
-	if size == 0 {
-		return nil
-	}
-
-	switch vm.bdTimerState {
-	case bdTimerStateMin:
-		return nil
-	case bdTimerStateMax:
-		if size < batchSize {
-			return nil
-		}
-	case bdTimerStateLong:
-		// timeout; go ahead and generate a new block anyway
-	}
-	select {
-	case vm.networkChan <- commonEng.PendingTxs:
-		// successfully push out the notification; this round ends
-		vm.bdGenFlag = true
-	default:
-		return errBlockFrequency
-	}
-	return nil
-}
-
-func (vm *VM) getCachedStatus(blockID ids.ID) choices.Status {
-	vm.metalock.Lock()
-	defer vm.metalock.Unlock()
-	status := choices.Processing
-
-	if statusIntf, ok := vm.blockStatusCache.Get(blockID); ok {
-		status = statusIntf.(choices.Status)
-	} else {
-		blk := vm.chain.GetBlockByHash(blockID.Key())
-		if blk == nil {
-			return choices.Unknown
-		}
-		acceptedBlk := vm.lastAccepted.ethBlock
-
-		// TODO: There must be a better way of doing this.
-		// Traverse up the chain from the lower block until the indices match
-		highBlock := blk
-		lowBlock := acceptedBlk
-		if highBlock.Number().Cmp(lowBlock.Number()) < 0 {
-			highBlock, lowBlock = lowBlock, highBlock
-		}
-		for highBlock.Number().Cmp(lowBlock.Number()) > 0 {
-			highBlock = vm.chain.GetBlockByHash(highBlock.ParentHash())
-		}
-
-		if highBlock.Hash() == lowBlock.Hash() { // on the same branch
-			if blk.Number().Cmp(acceptedBlk.Number()) <= 0 {
-				status = choices.Accepted
-			}
-		} else { // on different branches
-			status = choices.Rejected
-		}
-	}
-
-	vm.blockStatusCache.Put(blockID, status)
-	return status
-}
-
-func (vm *VM) getBlock(id ids.ID) *Block {
-	if blockIntf, ok := vm.blockCache.Get(id); ok {
-		return blockIntf.(*Block)
-	}
-	ethBlock := vm.getCachedBlock(id)
-	if ethBlock == nil {
-		return nil
-	}
-	block := &Block{
-		id:       ids.NewID(ethBlock.Hash()),
-		ethBlock: ethBlock,
-		vm:       vm,
-	}
-	vm.blockCache.Put(id, block)
-	return block
-}
-
-func (vm *VM) issueRemoteTxs(txs []*types.Transaction) error {
-	errs := vm.chain.AddRemoteTxs(txs)
-	for _, err := range errs {
-		if err != nil {
-			return err
-		}
-	}
-	return vm.tryBlockGen()
-}
-
-func (vm *VM) writeBackMetadata() {
-	vm.metalock.Lock()
-	defer vm.metalock.Unlock()
-
-	b, err := rlp.EncodeToBytes(vm.lastAccepted.ethBlock.Hash())
-	if err != nil {
-		vm.ctx.Log.Error("snowman-eth: error while writing back metadata")
-		return
-	}
-	vm.ctx.Log.Debug("writing back metadata")
-	vm.chaindb.Put([]byte(lastAcceptedKey), b)
-	atomic.StoreUint32(&vm.writingMetadata, 0)
-}
-
-func (vm *VM) getLastAccepted() *Block {
-	vm.metalock.Lock()
-	defer vm.metalock.Unlock()
-
-	return vm.lastAccepted
-}