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package l2
import (
"fmt"
"math/rand"
"testing"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/rlp"
"github.com/stretchr/testify/mock"
"github.com/stretchr/testify/require"
preimage "github.com/ethereum-optimism/optimism/op-preimage"
"github.com/ethereum-optimism/optimism/op-program/client/mpt"
"github.com/ethereum-optimism/optimism/op-service/eth"
"github.com/ethereum-optimism/optimism/op-service/testutils"
)
func mockPreimageOracle(t *testing.T) (po *PreimageOracle, hintsMock *mock.Mock, preimages map[common.Hash][]byte) {
// Prepare the pre-images
preimages = make(map[common.Hash][]byte)
hintsMock = new(mock.Mock)
po = &PreimageOracle{
oracle: preimage.OracleFn(func(key preimage.Key) []byte {
v, ok := preimages[key.PreimageKey()]
require.True(t, ok, "preimage must exist")
return v
}),
hint: preimage.HinterFn(func(v preimage.Hint) {
hintsMock.MethodCalled("hint", v.Hint())
}),
}
return po, hintsMock, preimages
}
// testBlock tests that the given block can be passed through the preimage oracle.
func testBlock(t *testing.T, block *types.Block) {
po, hints, preimages := mockPreimageOracle(t)
hdrBytes, err := rlp.EncodeToBytes(block.Header())
require.NoError(t, err)
preimages[preimage.Keccak256Key(block.Hash()).PreimageKey()] = hdrBytes
opaqueTxs, err := eth.EncodeTransactions(block.Transactions())
require.NoError(t, err)
_, txsNodes := mpt.WriteTrie(opaqueTxs)
for _, p := range txsNodes {
preimages[preimage.Keccak256Key(crypto.Keccak256Hash(p)).PreimageKey()] = p
}
// Prepare a raw mock pre-image oracle that will serve the pre-image data and handle hints
// Check if blocks with txs work
hints.On("hint", BlockHeaderHint(block.Hash()).Hint()).Once().Return()
hints.On("hint", TransactionsHint(block.Hash()).Hint()).Once().Return()
gotBlock := po.BlockByHash(block.Hash())
hints.AssertExpectations(t)
require.Equal(t, gotBlock.Hash(), block.Hash())
expectedTxs := block.Transactions()
require.Equal(t, len(expectedTxs), len(gotBlock.Transactions()), "expecting equal tx list length")
for i, tx := range gotBlock.Transactions() {
require.Equalf(t, tx.Hash(), expectedTxs[i].Hash(), "expecting tx %d to match", i)
}
}
func TestPreimageOracleBlockByHash(t *testing.T) {
rng := rand.New(rand.NewSource(123))
for i := 0; i < 10; i++ {
block, _ := testutils.RandomBlock(rng, 10)
t.Run(fmt.Sprintf("block_%d", i), func(t *testing.T) {
testBlock(t, block)
})
}
}
func TestPreimageOracleNodeByHash(t *testing.T) {
rng := rand.New(rand.NewSource(123))
for i := 0; i < 10; i++ {
t.Run(fmt.Sprintf("node_%d", i), func(t *testing.T) {
po, hints, preimages := mockPreimageOracle(t)
node := make([]byte, 123)
rng.Read(node)
h := crypto.Keccak256Hash(node)
preimages[preimage.Keccak256Key(h).PreimageKey()] = node
hints.On("hint", StateNodeHint(h).Hint()).Once().Return()
gotNode := po.NodeByHash(h)
hints.AssertExpectations(t)
require.Equal(t, hexutil.Bytes(node), hexutil.Bytes(gotNode), "node matches")
})
}
}
func TestPreimageOracleCodeByHash(t *testing.T) {
rng := rand.New(rand.NewSource(123))
for i := 0; i < 10; i++ {
t.Run(fmt.Sprintf("code_%d", i), func(t *testing.T) {
po, hints, preimages := mockPreimageOracle(t)
node := make([]byte, 123)
rng.Read(node)
h := crypto.Keccak256Hash(node)
preimages[preimage.Keccak256Key(h).PreimageKey()] = node
hints.On("hint", CodeHint(h).Hint()).Once().Return()
gotNode := po.CodeByHash(h)
hints.AssertExpectations(t)
require.Equal(t, hexutil.Bytes(node), hexutil.Bytes(gotNode), "code matches")
})
}
}
func TestPreimageOracleOutputByRoot(t *testing.T) {
rng := rand.New(rand.NewSource(123))
for i := 0; i < 10; i++ {
t.Run(fmt.Sprintf("output_%d", i), func(t *testing.T) {
po, hints, preimages := mockPreimageOracle(t)
output := testutils.RandomOutputV0(rng)
h := common.Hash(eth.OutputRoot(output))
preimages[preimage.Keccak256Key(h).PreimageKey()] = output.Marshal()
hints.On("hint", L2OutputHint(h).Hint()).Once().Return()
gotOutput := po.OutputByRoot(h)
hints.AssertExpectations(t)
require.Equal(t, hexutil.Bytes(output.Marshal()), hexutil.Bytes(gotOutput.Marshal()), "output matches")
})
}
}