path: root/light/odr_test.go

// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package light

import (
    "bytes"
    "context"
    "errors"
    "math/big"
    "testing"
    "time"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/common/math"
    "github.com/ethereum/go-ethereum/consensus/ethash"
    "github.com/ethereum/go-ethereum/core"
    "github.com/ethereum/go-ethereum/core/state"
    "github.com/ethereum/go-ethereum/core/types"
    "github.com/ethereum/go-ethereum/core/vm"
    "github.com/ethereum/go-ethereum/crypto"
    "github.com/ethereum/go-ethereum/ethdb"
    "github.com/ethereum/go-ethereum/params"
    "github.com/ethereum/go-ethereum/rlp"
    "github.com/ethereum/go-ethereum/trie"
)

var (
    testBankKey, _  = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
    testBankAddress = crypto.PubkeyToAddress(testBankKey.PublicKey)
    testBankFunds   = big.NewInt(100000000)

    acc1Key, _ = crypto.HexToECDSA("8a1f9a8f95be41cd7ccb6168179afb4504aefe388d1e14474d32c45c72ce7b7a")
    acc2Key, _ = crypto.HexToECDSA("49a7b37aa6f6645917e7b807e9d1c00d4fa71f18343b0d4122a4d2df64dd6fee")
    acc1Addr   = crypto.PubkeyToAddress(acc1Key.PublicKey)
    acc2Addr   = crypto.PubkeyToAddress(acc2Key.PublicKey)

    testContractCode = common.Hex2Bytes("606060405260cc8060106000396000f360606040526000357c01000000000000000000000000000000000000000000000000000000009004806360cd2685146041578063c16431b914606b57603f565b005b6055600480803590602001909190505060a9565b6040518082815260200191505060405180910390f35b60886004808035906020019091908035906020019091905050608a565b005b80600060005083606481101560025790900160005b50819055505b5050565b6000600060005082606481101560025790900160005b5054905060c7565b91905056")
    testContractAddr common.Address

    bigTxGas = new(big.Int).SetUint64(params.TxGas)
)

type testOdr struct {
    OdrBackend
    sdb, ldb ethdb.Database
    disable  bool
}

func (odr *testOdr) Database() ethdb.Database {
    return odr.ldb
}

var ErrOdrDisabled = errors.New("ODR disabled")

func (odr *testOdr) Retrieve(ctx context.Context, req OdrRequest) error {
    if odr.disable {
        return ErrOdrDisabled
    }
    switch req := req.(type) {
    case *BlockRequest:
        req.Rlp = core.GetBodyRLP(odr.sdb, req.Hash, core.GetBlockNumber(odr.sdb, req.Hash))
    case *ReceiptsRequest:
        req.Receipts = core.GetBlockReceipts(odr.sdb, req.Hash, core.GetBlockNumber(odr.sdb, req.Hash))
    case *TrieRequest:
        t, _ := trie.New(req.Id.Root, odr.sdb)
        req.Proof = t.Prove(req.Key)
    case *CodeRequest:
        req.Data, _ = odr.sdb.Get(req.Hash[:])
    }
    req.StoreResult(odr.ldb)
    return nil
}

type odrTestFn func(ctx context.Context, db ethdb.Database, bc *core.BlockChain, lc *LightChain, bhash common.Hash) ([]byte, error)

func TestOdrGetBlockLes1(t *testing.T) { testChainOdr(t, 1, odrGetBlock) }

func odrGetBlock(ctx context.Context, db ethdb.Database, bc *core.BlockChain, lc *LightChain, bhash common.Hash) ([]byte, error) {
    var block *types.Block
    if bc != nil {
        block = bc.GetBlockByHash(bhash)
    } else {
        block, _ = lc.GetBlockByHash(ctx, bhash)
    }
    if block == nil {
        return nil, nil
    }
    rlp, _ := rlp.EncodeToBytes(block)
    return rlp, nil
}

func TestOdrGetReceiptsLes1(t *testing.T) { testChainOdr(t, 1, odrGetReceipts) }

func odrGetReceipts(ctx context.Context, db ethdb.Database, bc *core.BlockChain, lc *LightChain, bhash common.Hash) ([]byte, error) {
    var receipts types.Receipts
    if bc != nil {
        receipts = core.GetBlockReceipts(db, bhash, core.GetBlockNumber(db, bhash))
    } else {
        receipts, _ = GetBlockReceipts(ctx, lc.Odr(), bhash, core.GetBlockNumber(db, bhash))
    }
    if receipts == nil {
        return nil, nil
    }
    rlp, _ := rlp.EncodeToBytes(receipts)
    return rlp, nil
}

func TestOdrAccountsLes1(t *testing.T) { testChainOdr(t, 1, odrAccounts) }

func odrAccounts(ctx context.Context, db ethdb.Database, bc *core.BlockChain, lc *LightChain, bhash common.Hash) ([]byte, error) {
    dummyAddr := common.HexToAddress("1234567812345678123456781234567812345678")
    acc := []common.Address{testBankAddress, acc1Addr, acc2Addr, dummyAddr}

    var st *state.StateDB
    if bc == nil {
        header := lc.GetHeaderByHash(bhash)
        st = NewState(ctx, header, lc.Odr())
    } else {
        header := bc.GetHeaderByHash(bhash)
        st, _ = state.New(header.Root, state.NewDatabase(db))
    }

    var res []byte
    for _, addr := range acc {
        bal := st.GetBalance(addr)
        rlp, _ := rlp.EncodeToBytes(bal)
        res = append(res, rlp...)
    }
    return res, st.Error()
}

func TestOdrContractCallLes1(t *testing.T) { testChainOdr(t, 1, odrContractCall) }

type callmsg struct {
    types.Message
}

func (callmsg) CheckNonce() bool { return false }

func odrContractCall(ctx context.Context, db ethdb.Database, bc *core.BlockChain, lc *LightChain, bhash common.Hash) ([]byte, error) {
    data := common.Hex2Bytes("60CD26850000000000000000000000000000000000000000000000000000000000000000")
    config := params.TestChainConfig

    var res []byte
    for i := 0; i < 3; i++ {
        data[35] = byte(i)

        var (
            st     *state.StateDB
            header *types.Header
            chain  core.ChainContext
        )
        if bc == nil {
            chain = lc
            header = lc.GetHeaderByHash(bhash)
            st = NewState(ctx, header, lc.Odr())
        } else {
            chain = bc
            header = bc.GetHeaderByHash(bhash)
            st, _ = state.New(header.Root, state.NewDatabase(db))
        }

        // Perform read-only call.
        st.SetBalance(testBankAddress, math.MaxBig256)
        msg := callmsg{types.NewMessage(testBankAddress, &testContractAddr, 0, new(big.Int), big.NewInt(1000000), new(big.Int), data, false)}
        context := core.NewEVMContext(msg, header, chain, nil)
        vmenv := vm.NewEVM(context, st, config, vm.Config{})
        gp := new(core.GasPool).AddGas(math.MaxBig256)
        ret, _, _, _ := core.ApplyMessage(vmenv, msg, gp)
        res = append(res, ret...)
        if st.Error() != nil {
            return res, st.Error()
        }
    }
    return res, nil
}

func testChainGen(i int, block *core.BlockGen) {
    signer := types.HomesteadSigner{}
    switch i {
    case 0:
        // In block 1, the test bank sends account #1 some ether.
        tx, _ := types.SignTx(types.NewTransaction(block.TxNonce(testBankAddress), acc1Addr, big.NewInt(10000), bigTxGas, nil, nil), signer, testBankKey)
        block.AddTx(tx)
    case 1:
        // In block 2, the test bank sends some more ether to account #1.
        // acc1Addr passes it on to account #2.
        // acc1Addr creates a test contract.
        tx1, _ := types.SignTx(types.NewTransaction(block.TxNonce(testBankAddress), acc1Addr, big.NewInt(1000), bigTxGas, nil, nil), signer, testBankKey)
        nonce := block.TxNonce(acc1Addr)
        tx2, _ := types.SignTx(types.NewTransaction(nonce, acc2Addr, big.NewInt(1000), bigTxGas, nil, nil), signer, acc1Key)
        nonce++
        tx3, _ := types.SignTx(types.NewContractCreation(nonce, big.NewInt(0), big.NewInt(1000000), big.NewInt(0), testContractCode), signer, acc1Key)
        testContractAddr = crypto.CreateAddress(acc1Addr, nonce)
        block.AddTx(tx1)
        block.AddTx(tx2)
        block.AddTx(tx3)
    case 2:
        // Block 3 is empty but was mined by account #2.
        block.SetCoinbase(acc2Addr)
        block.SetExtra([]byte("yeehaw"))
        data := common.Hex2Bytes("C16431B900000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000001")
        tx, _ := types.SignTx(types.NewTransaction(block.TxNonce(testBankAddress), testContractAddr, big.NewInt(0), big.NewInt(100000), nil, data), signer, testBankKey)
        block.AddTx(tx)
    case 3:
        // Block 4 includes blocks 2 and 3 as uncle headers (with modified extra data).
        b2 := block.PrevBlock(1).Header()
        b2.Extra = []byte("foo")
        block.AddUncle(b2)
        b3 := block.PrevBlock(2).Header()
        b3.Extra = []byte("foo")
        block.AddUncle(b3)
        data := common.Hex2Bytes("C16431B900000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000002")
        tx, _ := types.SignTx(types.NewTransaction(block.TxNonce(testBankAddress), testContractAddr, big.NewInt(0), big.NewInt(100000), nil, data), signer, testBankKey)
        block.AddTx(tx)
    }
}

func testChainOdr(t *testing.T, protocol int, fn odrTestFn) {
    var (
        sdb, _  = ethdb.NewMemDatabase()
        ldb, _  = ethdb.NewMemDatabase()
        gspec   = core.Genesis{Alloc: core.GenesisAlloc{testBankAddress: {Balance: testBankFunds}}}
        genesis = gspec.MustCommit(sdb)
    )
    gspec.MustCommit(ldb)
    // Assemble the test environment
    blockchain, _ := core.NewBlockChain(sdb, params.TestChainConfig, ethash.NewFullFaker(), vm.Config{})
    gchain, _ := core.GenerateChain(params.TestChainConfig, genesis, sdb, 4, testChainGen)
    if _, err := blockchain.InsertChain(gchain); err != nil {
        t.Fatal(err)
    }

    odr := &testOdr{sdb: sdb, ldb: ldb}
    lightchain, err := NewLightChain(odr, params.TestChainConfig, ethash.NewFullFaker())
    if err != nil {
        t.Fatal(err)
    }
    headers := make([]*types.Header, len(gchain))
    for i, block := range gchain {
        headers[i] = block.Header()
    }
    if _, err := lightchain.InsertHeaderChain(headers, 1); err != nil {
        t.Fatal(err)
    }

    test := func(expFail int) {
        for i := uint64(0); i <= blockchain.CurrentHeader().Number.Uint64(); i++ {
            bhash := core.GetCanonicalHash(sdb, i)
            b1, err := fn(NoOdr, sdb, blockchain, nil, bhash)
            if err != nil {
                t.Fatalf("error in full-node test for block %d: %v", i, err)
            }

            ctx, cancel := context.WithTimeout(context.Background(), 200*time.Millisecond)
            defer cancel()

            exp := i < uint64(expFail)
            b2, err := fn(ctx, ldb, nil, lightchain, bhash)
            if err != nil && exp {
                t.Errorf("error in ODR test for block %d: %v", i, err)
            }

            eq := bytes.Equal(b1, b2)
            if exp && !eq {
                t.Errorf("ODR test output for block %d doesn't match full node", i)
            }
        }
    }

    // expect retrievals to fail (except genesis block) without a les peer
    t.Log("checking without ODR")
    odr.disable = true
    test(1)

    // expect all retrievals to pass with ODR enabled
    t.Log("checking with ODR")
    odr.disable = false
    test(len(gchain))

    // still expect all retrievals to pass, now data should be cached locally
    t.Log("checking without ODR, should be cached")
    odr.disable = true
    test(len(gchain))
}