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// 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 les

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

    "github.com/ethereum/go-ethereum/common"
    "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/ethdb"
    "github.com/ethereum/go-ethereum/light"
    "github.com/ethereum/go-ethereum/rlp"
    "golang.org/x/net/context"
)

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

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

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

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

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

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

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

    var res []byte
    for _, addr := range acc {
        if bc != nil {
            header := bc.GetHeaderByHash(bhash)
            st, err := state.New(header.Root, db)
            if err == nil {
                bal := st.GetBalance(addr)
                rlp, _ := rlp.EncodeToBytes(bal)
                res = append(res, rlp...)
            }
        } else {
            header := lc.GetHeaderByHash(bhash)
            st := light.NewLightState(light.StateTrieID(header), lc.Odr())
            bal, err := st.GetBalance(ctx, addr)
            if err == nil {
                rlp, _ := rlp.EncodeToBytes(bal)
                res = append(res, rlp...)
            }
        }
    }

    return res
}

func TestOdrContractCallLes1(t *testing.T) { testOdr(t, 1, 2, odrContractCall) }

// fullcallmsg is the message type used for call transations.
type fullcallmsg struct {
    from          *state.StateObject
    to            *common.Address
    gas, gasPrice *big.Int
    value         *big.Int
    data          []byte
}

// accessor boilerplate to implement core.Message
func (m fullcallmsg) From() (common.Address, error)         { return m.from.Address(), nil }
func (m fullcallmsg) FromFrontier() (common.Address, error) { return m.from.Address(), nil }
func (m fullcallmsg) Nonce() uint64                         { return 0 }
func (m fullcallmsg) CheckNonce() bool                      { return false }
func (m fullcallmsg) To() *common.Address                   { return m.to }
func (m fullcallmsg) GasPrice() *big.Int                    { return m.gasPrice }
func (m fullcallmsg) Gas() *big.Int                         { return m.gas }
func (m fullcallmsg) Value() *big.Int                       { return m.value }
func (m fullcallmsg) Data() []byte                          { return m.data }

// callmsg is the message type used for call transations.
type lightcallmsg struct {
    from          *light.StateObject
    to            *common.Address
    gas, gasPrice *big.Int
    value         *big.Int
    data          []byte
}

// accessor boilerplate to implement core.Message
func (m lightcallmsg) From() (common.Address, error)         { return m.from.Address(), nil }
func (m lightcallmsg) FromFrontier() (common.Address, error) { return m.from.Address(), nil }
func (m lightcallmsg) Nonce() uint64                         { return 0 }
func (m lightcallmsg) CheckNonce() bool                      { return false }
func (m lightcallmsg) To() *common.Address                   { return m.to }
func (m lightcallmsg) GasPrice() *big.Int                    { return m.gasPrice }
func (m lightcallmsg) Gas() *big.Int                         { return m.gas }
func (m lightcallmsg) Value() *big.Int                       { return m.value }
func (m lightcallmsg) Data() []byte                          { return m.data }

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

    var res []byte
    for i := 0; i < 3; i++ {
        data[35] = byte(i)
        if bc != nil {
            header := bc.GetHeaderByHash(bhash)
            statedb, err := state.New(header.Root, db)
            if err == nil {
                from := statedb.GetOrNewStateObject(testBankAddress)
                from.SetBalance(common.MaxBig)

                msg := fullcallmsg{
                    from:     from,
                    gas:      big.NewInt(100000),
                    gasPrice: big.NewInt(0),
                    value:    big.NewInt(0),
                    data:     data,
                    to:       &testContractAddr,
                }

                vmenv := core.NewEnv(statedb, config, bc, msg, header, config.VmConfig)
                gp := new(core.GasPool).AddGas(common.MaxBig)
                ret, _, _ := core.ApplyMessage(vmenv, msg, gp)
                res = append(res, ret...)
            }
        } else {
            header := lc.GetHeaderByHash(bhash)
            state := light.NewLightState(light.StateTrieID(header), lc.Odr())
            from, err := state.GetOrNewStateObject(ctx, testBankAddress)
            if err == nil {
                from.SetBalance(common.MaxBig)

                msg := lightcallmsg{
                    from:     from,
                    gas:      big.NewInt(100000),
                    gasPrice: big.NewInt(0),
                    value:    big.NewInt(0),
                    data:     data,
                    to:       &testContractAddr,
                }

                vmenv := light.NewEnv(ctx, state, config, lc, msg, header, config.VmConfig)
                gp := new(core.GasPool).AddGas(common.MaxBig)
                ret, _, _ := core.ApplyMessage(vmenv, msg, gp)
                if vmenv.Error() == nil {
                    res = append(res, ret...)
                }
            }
        }
    }
    return res
}

func testOdr(t *testing.T, protocol int, expFail uint64, fn odrTestFn) {
    // Assemble the test environment
    pm, db, odr := newTestProtocolManagerMust(t, false, 4, testChainGen)
    lpm, ldb, odr := newTestProtocolManagerMust(t, true, 0, nil)
    _, err1, lpeer, err2 := newTestPeerPair("peer", protocol, pm, lpm)
    select {
    case <-time.After(time.Millisecond * 100):
    case err := <-err1:
        t.Fatalf("peer 1 handshake error: %v", err)
    case err := <-err2:
        t.Fatalf("peer 1 handshake error: %v", err)
    }

    lpm.synchronise(lpeer)

    test := func(expFail uint64) {
        for i := uint64(0); i <= pm.blockchain.CurrentHeader().Number.Uint64(); i++ {
            bhash := core.GetCanonicalHash(db, i)
            b1 := fn(light.NoOdr, db, pm.chainConfig, pm.blockchain.(*core.BlockChain), nil, bhash)
            ctx, _ := context.WithTimeout(context.Background(), 200*time.Millisecond)
            b2 := fn(ctx, ldb, lpm.chainConfig, nil, lpm.blockchain.(*light.LightChain), bhash)
            eq := bytes.Equal(b1, b2)
            exp := i < expFail
            if exp && !eq {
                t.Errorf("odr mismatch")
            }
            if !exp && eq {
                t.Errorf("unexpected odr match")
            }
        }
    }

    // temporarily remove peer to test odr fails
    odr.UnregisterPeer(lpeer)
    // expect retrievals to fail (except genesis block) without a les peer
    test(expFail)
    odr.RegisterPeer(lpeer)
    // expect all retrievals to pass
    test(5)
    odr.UnregisterPeer(lpeer)
    // still expect all retrievals to pass, now data should be cached locally
    test(5)
}