path: root/eth/protocol_test.go

package eth

import (
    "log"
    "math/big"
    "os"
    "testing"
    "time"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/core/types"
    "github.com/ethereum/go-ethereum/crypto"
    "github.com/ethereum/go-ethereum/errs"
    ethlogger "github.com/ethereum/go-ethereum/logger"
    "github.com/ethereum/go-ethereum/p2p"
    "github.com/ethereum/go-ethereum/p2p/discover"
)

var logsys = ethlogger.NewStdLogSystem(os.Stdout, log.LstdFlags, ethlogger.LogLevel(ethlogger.DebugDetailLevel))

var ini = false

func logInit() {
    if !ini {
        ethlogger.AddLogSystem(logsys)
        ini = true
    }
}

type testTxPool struct {
    getTransactions func() []*types.Transaction
    addTransactions func(txs []*types.Transaction)
}

type testChainManager struct {
    getBlockHashes func(hash common.Hash, amount uint64) (hashes []common.Hash)
    getBlock       func(hash common.Hash) *types.Block
    status         func() (td *big.Int, currentBlock common.Hash, genesisBlock common.Hash)
}

type testBlockPool struct {
    addBlockHashes func(next func() (common.Hash, bool), peerId string)
    addBlock       func(block *types.Block, peerId string) (err error)
    addPeer        func(td *big.Int, currentBlock common.Hash, peerId string, requestHashes func(common.Hash) error, requestBlocks func([]common.Hash) error, peerError func(*errs.Error)) (best bool, suspended bool)
    removePeer     func(peerId string)
}

func (self *testTxPool) AddTransactions(txs []*types.Transaction) {
    if self.addTransactions != nil {
        self.addTransactions(txs)
    }
}

func (self *testTxPool) GetTransactions() types.Transactions { return nil }

func (self *testChainManager) GetBlockHashesFromHash(hash common.Hash, amount uint64) (hashes []common.Hash) {
    if self.getBlockHashes != nil {
        hashes = self.getBlockHashes(hash, amount)
    }
    return
}

func (self *testChainManager) Status() (td *big.Int, currentBlock common.Hash, genesisBlock common.Hash) {
    if self.status != nil {
        td, currentBlock, genesisBlock = self.status()
    } else {
        td = common.Big1
        currentBlock = common.Hash{1}
        genesisBlock = common.Hash{2}
    }
    return
}

func (self *testChainManager) GetBlock(hash common.Hash) (block *types.Block) {
    if self.getBlock != nil {
        block = self.getBlock(hash)
    }
    return
}

func (self *testBlockPool) AddBlockHashes(next func() (common.Hash, bool), peerId string) {
    if self.addBlockHashes != nil {
        self.addBlockHashes(next, peerId)
    }
}

func (self *testBlockPool) AddBlock(block *types.Block, peerId string) {
    if self.addBlock != nil {
        self.addBlock(block, peerId)
    }
}

func (self *testBlockPool) AddPeer(td *big.Int, currentBlock common.Hash, peerId string, requestBlockHashes func(common.Hash) error, requestBlocks func([]common.Hash) error, peerError func(*errs.Error)) (best bool, suspended bool) {
    if self.addPeer != nil {
        best, suspended = self.addPeer(td, currentBlock, peerId, requestBlockHashes, requestBlocks, peerError)
    }
    return
}

func (self *testBlockPool) RemovePeer(peerId string) {
    if self.removePeer != nil {
        self.removePeer(peerId)
    }
}

func testPeer() *p2p.Peer {
    var id discover.NodeID
    pk := crypto.GenerateNewKeyPair().PublicKey
    copy(id[:], pk)
    return p2p.NewPeer(id, "test peer", []p2p.Cap{})
}

type ethProtocolTester struct {
    p2p.MsgReadWriter // writing to the tester feeds the protocol

    quit         chan error
    pipe         *p2p.MsgPipeRW    // the protocol read/writes on this end
    txPool       *testTxPool       // txPool
    chainManager *testChainManager // chainManager
    blockPool    *testBlockPool    // blockPool
    t            *testing.T
}

func newEth(t *testing.T) *ethProtocolTester {
    p1, p2 := p2p.MsgPipe()
    return &ethProtocolTester{
        MsgReadWriter: p1,
        quit:          make(chan error, 1),
        pipe:          p2,
        txPool:        &testTxPool{},
        chainManager:  &testChainManager{},
        blockPool:     &testBlockPool{},
        t:             t,
    }
}

func (self *ethProtocolTester) reset() {
    self.pipe.Close()

    p1, p2 := p2p.MsgPipe()
    self.MsgReadWriter = p1
    self.pipe = p2
    self.quit = make(chan error, 1)
}

func (self *ethProtocolTester) checkError(expCode int, delay time.Duration) (err error) {
    var timer = time.After(delay)
    select {
    case err = <-self.quit:
    case <-timer:
        self.t.Errorf("no error after %v, expected %v", delay, expCode)
        return
    }
    perr, ok := err.(*errs.Error)
    if ok && perr != nil {
        if code := perr.Code; code != expCode {
            self.t.Errorf("expected protocol error (code %v), got %v (%v)", expCode, code, err)
        }
    } else {
        self.t.Errorf("expected protocol error (code %v), got %v", expCode, err)
    }
    return
}

func (self *ethProtocolTester) run() {
    err := runEthProtocol(ProtocolVersion, NetworkId, self.txPool, self.chainManager, self.blockPool, testPeer(), self.pipe)
    self.quit <- err
}

func (self *ethProtocolTester) handshake(t *testing.T, mock bool) {
    td, currentBlock, genesis := self.chainManager.Status()
    // first outgoing msg should be StatusMsg.
    err := p2p.ExpectMsg(self, StatusMsg, &statusMsgData{
        ProtocolVersion: ProtocolVersion,
        NetworkId:       NetworkId,
        TD:              *td,
        CurrentBlock:    currentBlock,
        GenesisBlock:    genesis,
    })
    if err != nil {
        t.Fatalf("incorrect outgoing status: %v", err)
    }
    if mock {
        go p2p.Send(self, StatusMsg, &statusMsgData{ProtocolVersion, NetworkId, *td, currentBlock, genesis})
    }
}

func TestStatusMsgErrors(t *testing.T) {
    logInit()
    eth := newEth(t)
    go eth.run()
    td, currentBlock, genesis := eth.chainManager.Status()

    tests := []struct {
        code          uint64
        data          interface{}
        wantErrorCode int
    }{
        {
            code: TxMsg, data: []interface{}{},
            wantErrorCode: ErrNoStatusMsg,
        },
        {
            code: StatusMsg, data: statusMsgData{10, NetworkId, *td, currentBlock, genesis},
            wantErrorCode: ErrProtocolVersionMismatch,
        },
        {
            code: StatusMsg, data: statusMsgData{ProtocolVersion, 999, *td, currentBlock, genesis},
            wantErrorCode: ErrNetworkIdMismatch,
        },
        {
            code: StatusMsg, data: statusMsgData{ProtocolVersion, NetworkId, *td, currentBlock, common.Hash{3}},
            wantErrorCode: ErrGenesisBlockMismatch,
        },
    }
    for _, test := range tests {
        eth.handshake(t, false)
        // the send call might hang until reset because
        // the protocol might not read the payload.
        go p2p.Send(eth, test.code, test.data)
        eth.checkError(test.wantErrorCode, 1*time.Second)

        eth.reset()
        go eth.run()
    }
}

func TestNewBlockMsg(t *testing.T) {
    // logInit()
    eth := newEth(t)

    var disconnected bool
    eth.blockPool.removePeer = func(peerId string) {
        disconnected = true
    }

    go eth.run()

    eth.handshake(t, true)
    err := p2p.ExpectMsg(eth, TxMsg, []interface{}{})
    if err != nil {
        t.Errorf("transactions expected, got %v", err)
    }

    var tds = make(chan *big.Int)
    eth.blockPool.addPeer = func(td *big.Int, currentBlock common.Hash, peerId string, requestHashes func(common.Hash) error, requestBlocks func([]common.Hash) error, peerError func(*errs.Error)) (best bool, suspended bool) {
        tds <- td
        return
    }

    var delay = 1 * time.Second
    // eth.reset()
    block := types.NewBlock(common.Hash{1}, common.Address{1}, common.Hash{1}, common.Big1, 1, "extra")

    go p2p.Send(eth, NewBlockMsg, &newBlockMsgData{Block: block})
    timer := time.After(delay)

    select {
    case td := <-tds:
        if td.Cmp(common.Big0) != 0 {
            t.Errorf("incorrect td %v, expected %v", td, common.Big0)
        }
    case <-timer:
        t.Errorf("no td recorded after %v", delay)
        return
    case err := <-eth.quit:
        t.Errorf("no error expected, got %v", err)
        return
    }

    go p2p.Send(eth, NewBlockMsg, &newBlockMsgData{block, common.Big2})
    timer = time.After(delay)

    select {
    case td := <-tds:
        if td.Cmp(common.Big2) != 0 {
            t.Errorf("incorrect td %v, expected %v", td, common.Big2)
        }
    case <-timer:
        t.Errorf("no td recorded after %v", delay)
        return
    case err := <-eth.quit:
        t.Errorf("no error expected, got %v", err)
        return
    }

    go p2p.Send(eth, NewBlockMsg, []interface{}{})
    // Block.DecodeRLP: validation failed: header is nil
    eth.checkError(ErrDecode, delay)

}

func TestBlockMsg(t *testing.T) {
    // logInit()
    eth := newEth(t)
    blocks := make(chan *types.Block)
    eth.blockPool.addBlock = func(block *types.Block, peerId string) (err error) {
        blocks <- block
        return
    }

    var disconnected bool
    eth.blockPool.removePeer = func(peerId string) {
        disconnected = true
    }

    go eth.run()

    eth.handshake(t, true)
    err := p2p.ExpectMsg(eth, TxMsg, []interface{}{})
    if err != nil {
        t.Errorf("transactions expected, got %v", err)
    }

    var delay = 3 * time.Second
    // eth.reset()
    newblock := func(i int64) *types.Block {
        return types.NewBlock(common.Hash{byte(i)}, common.Address{byte(i)}, common.Hash{byte(i)}, big.NewInt(i), uint64(i), string(i))
    }
    b := newblock(0)
    b.Header().Difficulty = nil // check if nil as *big.Int decodes as 0
    go p2p.Send(eth, BlocksMsg, types.Blocks{b, newblock(1), newblock(2)})
    timer := time.After(delay)
    for i := int64(0); i < 3; i++ {
        select {
        case block := <-blocks:
            if (block.ParentHash() != common.Hash{byte(i)}) {
                t.Errorf("incorrect block %v, expected %v", block.ParentHash(), common.Hash{byte(i)})
            }
            if block.Difficulty().Cmp(big.NewInt(i)) != 0 {
                t.Errorf("incorrect block %v, expected %v", block.Difficulty(), big.NewInt(i))
            }
        case <-timer:
            t.Errorf("no td recorded after %v", delay)
            return
        case err := <-eth.quit:
            t.Errorf("no error expected, got %v", err)
            return
        }
    }

    go p2p.Send(eth, BlocksMsg, []interface{}{[]interface{}{}})
    eth.checkError(ErrDecode, delay)
    if !disconnected {
        t.Errorf("peer not disconnected after error")
    }

    // test empty transaction
    eth.reset()
    go eth.run()
    eth.handshake(t, true)
    err = p2p.ExpectMsg(eth, TxMsg, []interface{}{})
    if err != nil {
        t.Errorf("transactions expected, got %v", err)
    }
    b = newblock(0)
    b.AddTransaction(nil)
    go p2p.Send(eth, BlocksMsg, types.Blocks{b})
    eth.checkError(ErrDecode, delay)

}

func TestTransactionsMsg(t *testing.T) {
    logInit()
    eth := newEth(t)
    txs := make(chan *types.Transaction)

    eth.txPool.addTransactions = func(t []*types.Transaction) {
        for _, tx := range t {
            txs <- tx
        }
    }
    go eth.run()

    eth.handshake(t, true)
    err := p2p.ExpectMsg(eth, TxMsg, []interface{}{})
    if err != nil {
        t.Errorf("transactions expected, got %v", err)
    }

    var delay = 3 * time.Second
    tx := &types.Transaction{}

    go p2p.Send(eth, TxMsg, []interface{}{tx, tx})
    timer := time.After(delay)
    for i := int64(0); i < 2; i++ {
        select {
        case <-txs:
        case <-timer:
            return
        case err := <-eth.quit:
            t.Errorf("no error expected, got %v", err)
            return
        }
    }

    go p2p.Send(eth, TxMsg, []interface{}{[]interface{}{}})
    eth.checkError(ErrDecode, delay)

}