Warp preparation (#573)

* Add warp precompile preparation

* Update hash slice packing

* Remove unnecessary local var

* Add VM type assertion

* Enable Warp API by default

accounts/abi/bind/precompilebind/precompile_module_template.go

@@ -28,7 +28,7 @@ const ConfigKey = "{{decapitalise .Contract.Type}}Config"
 
 // ContractAddress is the defined address of the precompile contract.
 // This should be unique across all precompile contracts.
-// See params/precompile_modules.go for registered precompile contracts and more information.
+// See precompile/registry/registry.go for registered precompile contracts and more information.
 var ContractAddress = common.HexToAddress("{ASUITABLEHEXADDRESS}") // SET A SUITABLE HEX ADDRESS HERE
 
 // Module is the precompile module. It is used to register the precompile contract.

core/predicate_check.go

@@ -4,7 +4,6 @@
 package core
 
 import (
-	"errors"
 	"fmt"
 
 	"github.com/ava-labs/subnet-evm/core/types"
@@ -14,8 +13,6 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 )
 
-var errNilProposerVMBlockCtxWithProposerPredicate = errors.New("engine cannot specify nil ProposerVM block context with non-empty proposer predicates")
-
 // CheckPredicates checks that all precompile predicates are satisfied within the current [predicateContext] for [tx]
 func CheckPredicates(rules params.Rules, predicateContext *precompileconfig.ProposerPredicateContext, tx *types.Transaction) error {
 	if err := checkPrecompilePredicates(rules, &predicateContext.PrecompilePredicateContext, tx); err != nil {
@@ -43,7 +40,8 @@ func checkPrecompilePredicates(rules params.Rules, predicateContext *precompilec
 			return fmt.Errorf("predicate %s failed verification for tx %s: specified %s in access list multiple times", address, tx.Hash(), address)
 		}
 		precompileAddressChecks[address] = struct{}{}
-		if err := predicater.VerifyPredicate(predicateContext, utils.HashSliceToBytes(accessTuple.StorageKeys)); err != nil {
+		predicateBytes := utils.HashSliceToBytes(accessTuple.StorageKeys)
+		if err := predicater.VerifyPredicate(predicateContext, predicateBytes); err != nil {
 			return fmt.Errorf("predicate %s failed verification for tx %s: %w", address, tx.Hash(), err)
 		}
 	}
@@ -56,10 +54,6 @@ func checkProposerPrecompilePredicates(rules params.Rules, predicateContext *pre
 	if len(rules.ProposerPredicates) == 0 {
 		return nil
 	}
-	// If a proposer predicate is specified, reuqire that the ProposerVMBlockCtx is non-nil.
-	if predicateContext.ProposerVMBlockCtx == nil {
-		return errNilProposerVMBlockCtxWithProposerPredicate
-	}
 	precompilePredicates := rules.ProposerPredicates
 	// Track addresses that we've performed a predicate check for
 	precompileAddressChecks := make(map[common.Address]struct{})
@@ -74,7 +68,8 @@ func checkProposerPrecompilePredicates(rules params.Rules, predicateContext *pre
 			return fmt.Errorf("predicate %s failed verification for tx %s: specified %s in access list multiple times", address, tx.Hash(), address)
 		}
 		precompileAddressChecks[address] = struct{}{}
-		if err := predicater.VerifyPredicate(predicateContext, utils.HashSliceToBytes(accessTuple.StorageKeys)); err != nil {
+		predicateBytes := utils.HashSliceToBytes(accessTuple.StorageKeys)
+		if err := predicater.VerifyPredicate(predicateContext, predicateBytes); err != nil {
 			return fmt.Errorf("predicate %s failed verification for tx %s: %w", address, tx.Hash(), err)
 		}
 	}

core/predicate_check_test.go

@@ -148,11 +148,10 @@ func TestCheckPredicate(t *testing.T) {
 			}),
 			expectedErr: fmt.Errorf("unexpected bytes: 0x%x", common.Hash{2}.Bytes()),
 		},
-		"proposer predicate with empty proposer block ctx": {
+		"proposer predicate with empty proposer block ctx passes": {
 			address:               common.HexToAddress("0x8db97C7cEcE249c2b98bDC0226Cc4C2A57BF52FC"),
 			proposerPredicater:    &mockProposerPredicater{predicateFunc: func(_ *precompileconfig.ProposerPredicateContext, b []byte) error { return nil }},
 			emptyProposerBlockCtx: true,
-			expectedErr:           errNilProposerVMBlockCtxWithProposerPredicate,
 		},
 	} {
 		test := test

miner/worker.go

@@ -368,7 +368,7 @@ func (w *worker) handleResult(env *environment, block *types.Block, createdAt ti
 		logs = append(logs, receipt.Logs...)
 	}
 
-	log.Info("Commit new mining work", "number", block.Number(), "hash", hash, "uncles", 0, "txs", env.tcount,
+	log.Info("Commit new mining work", "number", block.Number(), "hash", hash, "timestamp", block.Time(), "uncles", 0, "txs", env.tcount,
 		"gas", block.GasUsed(), "fees", totalFees(block, receipts), "elapsed", common.PrettyDuration(time.Since(env.start)))
 
 	// Note: the miner no longer emits a NewMinedBlock event. Instead the caller
@@ -409,7 +409,7 @@ func (w *worker) enforcePredicates(
 ) map[common.Address]types.Transactions {
 	// Short circuit early if there are no precompile predicates to verify and return the
 	// unmodified pending transactions.
-	if len(rules.PredicatePrecompiles) == 0 {
+	if !rules.PredicatesExist() {
 		return pending
 	}
 	result := make(map[common.Address]types.Transactions, len(pending))

params/precompile_upgrade.go

@@ -27,7 +27,6 @@ type PrecompileUpgrade struct {
 
 // UnmarshalJSON unmarshals the json into the correct precompile config type
 // based on the key. Keys are defined in each precompile module, and registered in
-// params/precompile_modules.go.
 // precompile/registry/registry.go.
 // Ex: {"feeManagerConfig": {...}} where "feeManagerConfig" is the key
 func (u *PrecompileUpgrade) UnmarshalJSON(data []byte) error {

plugin/evm/block.go

@@ -89,7 +89,6 @@ func (b *Block) Accept(context.Context) error {
 // contract.Accepter
 // This function assumes that the Accept function will ONLY operate on state maintained in the VM's versiondb.
 // This ensures that any DB operations are performed atomically with marking the block as accepted.
-// Passes in sharedMemoryWriter to accumulate any requests from shared memory to commit on block accept.
 func (b *Block) handlePrecompileAccept(sharedMemoryWriter *sharedMemoryWriter) error {
 	rules := b.vm.chainConfig.AvalancheRules(b.ethBlock.Number(), b.ethBlock.Timestamp())
 	// Short circuit early if there are no precompile accepters to execute
@@ -113,6 +112,7 @@ func (b *Block) handlePrecompileAccept(sharedMemoryWriter *sharedMemoryWriter) e
 			acceptCtx := &precompileconfig.AcceptContext{
 				SnowCtx:      b.vm.ctx,
 				SharedMemory: sharedMemoryWriter,
+				Warp:         b.vm.warpBackend,
 			}
 			if err := accepter.Accept(acceptCtx, log.TxHash, txIndex, log.Topics, log.Data); err != nil {
 				return err

plugin/evm/config.go

@@ -47,6 +47,7 @@ const (
 	defaultPopulateMissingTriesParallelism            = 1024
 	defaultStateSyncServerTrieCache                   = 64 // MB
 	defaultAcceptedCacheSize                          = 32 // blocks
+	defaultWarpAPIEnabled                             = true
 
 	// defaultStateSyncMinBlocks is the minimum number of blocks the blockchain
 	// should be ahead of local last accepted to perform state sync.
@@ -224,6 +225,7 @@ func (c *Config) SetDefaults() {
 	c.RPCGasCap = defaultRpcGasCap
 	c.RPCTxFeeCap = defaultRpcTxFeeCap
 	c.MetricsExpensiveEnabled = defaultMetricsExpensiveEnabled
+	c.WarpAPIEnabled = defaultWarpAPIEnabled
 
 	c.TxPoolJournal = core.DefaultTxPoolConfig.Journal
 	c.TxPoolRejournal = Duration{core.DefaultTxPoolConfig.Rejournal}

plugin/evm/vm.go

@@ -77,8 +77,9 @@ import (
 )
 
 var (
-	_ block.ChainVM              = &VM{}
-	_ block.HeightIndexedChainVM = &VM{}
+	_ block.ChainVM                      = &VM{}
+	_ block.HeightIndexedChainVM         = &VM{}
+	_ block.BuildBlockWithContextChainVM = &VM{}
 )
 
 const (

precompile/precompileconfig/config.go

@@ -11,6 +11,7 @@ import (
 	"github.com/ava-labs/avalanchego/ids"
 	"github.com/ava-labs/avalanchego/snow"
 	"github.com/ava-labs/avalanchego/snow/engine/snowman/block"
+	"github.com/ava-labs/avalanchego/vms/platformvm/warp"
 	"github.com/ethereum/go-ethereum/common"
 )
 
@@ -76,10 +77,15 @@ type SharedMemoryWriter interface {
 	AddSharedMemoryRequests(chainID ids.ID, requests *atomic.Requests)
 }
 
+type WarpMessageWriter interface {
+	AddMessage(unsignedMessage *warp.UnsignedMessage) error
+}
+
 // AcceptContext defines the context passed in to a precompileconfig's Accepter
 type AcceptContext struct {
 	SnowCtx      *snow.Context
 	SharedMemory SharedMemoryWriter
+	Warp         WarpMessageWriter
 }
 
 // Accepter is an optional interface for StatefulPrecompiledContracts to implement.

utils/bytes.go

@@ -19,11 +19,26 @@ func IncrOne(bytes []byte) {
 	}
 }
 
-// HashSliceToBytes serializes a []common.Hash into a []byte
+// HashSliceToBytes serializes a []common.Hash into a tightly packed byte array.
 func HashSliceToBytes(hashes []common.Hash) []byte {
 	bytes := make([]byte, common.HashLength*len(hashes))
 	for i, hash := range hashes {
 		copy(bytes[i*common.HashLength:], hash[:])
 	}
 	return bytes
 }
+
+// BytesToHashSlice packs [b] into a slice of hash values with zero padding
+// to the right if the length of b is not a multiple of 32.
+func BytesToHashSlice(b []byte) []common.Hash {
+	var (
+		numHashes = (len(b) + 31) / 32
+		hashes    = make([]common.Hash, numHashes)
+	)
+
+	for i := range hashes {
+		start := i * common.HashLength
+		copy(hashes[i][:], b[start:])
+	}
+	return hashes
+}

utils/bytes_test.go

@@ -4,10 +4,13 @@
 package utils
 
 import (
+	"bytes"
 	"testing"
 
+	"github.com/ava-labs/avalanchego/utils"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestIncrOne(t *testing.T) {
@@ -37,33 +40,27 @@ func TestIncrOne(t *testing.T) {
 	}
 }
 
-func TestHashSliceToBytes(t *testing.T) {
-	type test struct {
-		input    []common.Hash
-		expected []byte
+func testBytesToHashSlice(t testing.TB, b []byte) {
+	hashSlice := BytesToHashSlice(b)
+
+	copiedBytes := HashSliceToBytes(hashSlice)
+
+	if len(b)%32 == 0 {
+		require.Equal(t, b, copiedBytes)
+	} else {
+		require.Equal(t, b, copiedBytes[:len(b)])
+		// Require that any additional padding is all zeroes
+		padding := copiedBytes[len(b):]
+		require.Equal(t, bytes.Repeat([]byte{0x00}, len(padding)), padding)
 	}
-	for name, test := range map[string]test{
-		"empty slice": {
-			input:    []common.Hash{},
-			expected: []byte{},
-		},
-		"convert single hash": {
-			input: []common.Hash{
-				common.BytesToHash([]byte{1, 2, 3}),
-			},
-			expected: []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3},
-		},
-		"convert hash slice": {
-			input: []common.Hash{
-				common.BytesToHash([]byte{1, 2, 3}),
-				common.BytesToHash([]byte{4, 5, 6}),
-			},
-			expected: []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 5, 6},
-		},
-	} {
-		t.Run(name, func(t *testing.T) {
-			output := HashSliceToBytes(test.input)
-			assert.Equal(t, output, test.expected)
-		})
+}
+
+func FuzzHashSliceToBytes(f *testing.F) {
+	for i := 0; i < 100; i++ {
+		f.Add(utils.RandomBytes(i))
 	}
+
+	f.Fuzz(func(t *testing.T, a []byte) {
+		testBytesToHashSlice(t, a)
+	})
 }

warp/backend.go

@@ -4,7 +4,6 @@
 package warp
 
 import (
-	"context"
 	"fmt"
 
 	"github.com/ava-labs/avalanchego/cache"
@@ -22,10 +21,10 @@ var _ WarpBackend = &warpBackend{}
 // The backend is also used to query for warp message signatures by the signature request handler.
 type WarpBackend interface {
 	// AddMessage signs [unsignedMessage] and adds it to the warp backend database
-	AddMessage(ctx context.Context, unsignedMessage *avalancheWarp.UnsignedMessage) error
+	AddMessage(unsignedMessage *avalancheWarp.UnsignedMessage) error
 
 	// GetSignature returns the signature of the requested message hash.
-	GetSignature(ctx context.Context, messageHash ids.ID) ([bls.SignatureLen]byte, error)
+	GetSignature(messageHash ids.ID) ([bls.SignatureLen]byte, error)
 }
 
 // warpBackend implements WarpBackend, keeps track of warp messages, and generates message signatures.
@@ -44,7 +43,7 @@ func NewWarpBackend(snowCtx *snow.Context, db database.Database, signatureCacheS
 	}
 }
 
-func (w *warpBackend) AddMessage(ctx context.Context, unsignedMessage *avalancheWarp.UnsignedMessage) error {
+func (w *warpBackend) AddMessage(unsignedMessage *avalancheWarp.UnsignedMessage) error {
 	messageID := hashing.ComputeHash256Array(unsignedMessage.Bytes())
 
 	// In the case when a node restarts, and possibly changes its bls key, the cache gets emptied but the database does not.
@@ -65,7 +64,7 @@ func (w *warpBackend) AddMessage(ctx context.Context, unsignedMessage *avalanche
 	return nil
 }
 
-func (w *warpBackend) GetSignature(ctx context.Context, messageID ids.ID) ([bls.SignatureLen]byte, error) {
+func (w *warpBackend) GetSignature(messageID ids.ID) ([bls.SignatureLen]byte, error) {
 	if sig, ok := w.signatureCache.Get(messageID); ok {
 		return sig, nil
 	}

warp/backend_test.go

@@ -4,7 +4,6 @@
 package warp
 
 import (
-	"context"
 	"testing"
 
 	"github.com/ava-labs/avalanchego/database/memdb"
@@ -34,12 +33,12 @@ func TestAddAndGetValidMessage(t *testing.T) {
 	// Create a new unsigned message and add it to the warp backend.
 	unsignedMsg, err := avalancheWarp.NewUnsignedMessage(sourceChainID, destinationChainID, payload)
 	require.NoError(t, err)
-	err = backend.AddMessage(context.Background(), unsignedMsg)
+	err = backend.AddMessage(unsignedMsg)
 	require.NoError(t, err)
 
 	// Verify that a signature is returned successfully, and compare to expected signature.
 	messageID := hashing.ComputeHash256Array(unsignedMsg.Bytes())
-	signature, err := backend.GetSignature(context.Background(), messageID)
+	signature, err := backend.GetSignature(messageID)
 	require.NoError(t, err)
 
 	expectedSig, err := snowCtx.WarpSigner.Sign(unsignedMsg)
@@ -56,7 +55,7 @@ func TestAddAndGetUnknownMessage(t *testing.T) {
 
 	// Try getting a signature for a message that was not added.
 	messageID := hashing.ComputeHash256Array(unsignedMsg.Bytes())
-	_, err = backend.GetSignature(context.Background(), messageID)
+	_, err = backend.GetSignature(messageID)
 	require.Error(t, err)
 }
 
@@ -74,12 +73,12 @@ func TestZeroSizedCache(t *testing.T) {
 	// Create a new unsigned message and add it to the warp backend.
 	unsignedMsg, err := avalancheWarp.NewUnsignedMessage(sourceChainID, destinationChainID, payload)
 	require.NoError(t, err)
-	err = backend.AddMessage(context.Background(), unsignedMsg)
+	err = backend.AddMessage(unsignedMsg)
 	require.NoError(t, err)
 
 	// Verify that a signature is returned successfully, and compare to expected signature.
 	messageID := hashing.ComputeHash256Array(unsignedMsg.Bytes())
-	signature, err := backend.GetSignature(context.Background(), messageID)
+	signature, err := backend.GetSignature(messageID)
 	require.NoError(t, err)
 
 	expectedSig, err := snowCtx.WarpSigner.Sign(unsignedMsg)

warp/handlers/signature_request.go

@@ -50,7 +50,7 @@ func (s *signatureRequestHandler) OnSignatureRequest(ctx context.Context, nodeID
 		s.stats.UpdateSignatureRequestTime(time.Since(startTime))
 	}()
 
-	signature, err := s.backend.GetSignature(ctx, signatureRequest.MessageID)
+	signature, err := s.backend.GetSignature(signatureRequest.MessageID)
 	if err != nil {
 		log.Debug("Unknown warp signature requested", "messageID", signatureRequest.MessageID)
 		s.stats.IncSignatureMiss()

warp/handlers/signature_request_test.go

@@ -33,8 +33,8 @@ func TestSignatureHandler(t *testing.T) {
 	require.NoError(t, err)
 
 	messageID := hashing.ComputeHash256Array(msg.Bytes())
-	require.NoError(t, warpBackend.AddMessage(context.Background(), msg))
-	signature, err := warpBackend.GetSignature(context.Background(), messageID)
+	require.NoError(t, warpBackend.AddMessage(msg))
+	signature, err := warpBackend.GetSignature(messageID)
 	require.NoError(t, err)
 	unknownMessageID := ids.GenerateTestID()
 

warp/warp_service.go

@@ -18,7 +18,7 @@ type WarpAPI struct {
 
 // GetSignature returns the BLS signature associated with a messageID.
 func (api *WarpAPI) GetSignature(ctx context.Context, messageID ids.ID) (hexutil.Bytes, error) {
-	signature, err := api.Backend.GetSignature(ctx, messageID)
+	signature, err := api.Backend.GetSignature(messageID)
 	if err != nil {
 		return nil, fmt.Errorf("failed to get signature for with error %w", err)
 	}