path: root/eth/helper_test.go

// Copyright 2015 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/>.

// This file contains some shares testing functionality, common to  multiple
// different files and modules being tested.

package eth

import (
    "crypto/ecdsa"
    "crypto/rand"
    "math/big"
    "sort"
    "sync"
    "testing"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/consensus/ethash"
    "github.com/ethereum/go-ethereum/core"
    "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/eth/downloader"
    "github.com/ethereum/go-ethereum/ethdb"
    "github.com/ethereum/go-ethereum/event"
    "github.com/ethereum/go-ethereum/p2p"
    "github.com/ethereum/go-ethereum/p2p/enode"
    "github.com/ethereum/go-ethereum/params"
)

var (
    testBankKey, _ = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
    testBank       = crypto.PubkeyToAddress(testBankKey.PublicKey)
)

// newTestProtocolManager creates a new protocol manager for testing purposes,
// with the given number of blocks already known, and potential notification
// channels for different events.
func newTestProtocolManager(mode downloader.SyncMode, blocks int, generator func(int, *core.BlockGen), newtx chan<- []*types.Transaction) (*ProtocolManager, *ethdb.MemDatabase, error) {
    var (
        evmux  = new(event.TypeMux)
        engine = ethash.NewFaker()
        db     = ethdb.NewMemDatabase()
        gspec  = &core.Genesis{
            Config: params.TestChainConfig,
            Alloc:  core.GenesisAlloc{testBank: {Balance: big.NewInt(1000000)}},
        }
        genesis       = gspec.MustCommit(db)
        blockchain, _ = core.NewBlockChain(db, nil, gspec.Config, engine, vm.Config{}, nil)
    )
    chain, _ := core.GenerateChain(gspec.Config, genesis, ethash.NewFaker(), db, blocks, generator)
    if _, err := blockchain.InsertChain(chain); err != nil {
        panic(err)
    }

    pm, err := NewProtocolManager(gspec.Config, mode, DefaultConfig.NetworkId, evmux, &testTxPool{added: newtx}, engine, blockchain, db, nil)
    if err != nil {
        return nil, nil, err
    }
    pm.Start(1000)
    return pm, db, nil
}

// newTestProtocolManagerMust creates a new protocol manager for testing purposes,
// with the given number of blocks already known, and potential notification
// channels for different events. In case of an error, the constructor force-
// fails the test.
func newTestProtocolManagerMust(t *testing.T, mode downloader.SyncMode, blocks int, generator func(int, *core.BlockGen), newtx chan<- []*types.Transaction) (*ProtocolManager, *ethdb.MemDatabase) {
    pm, db, err := newTestProtocolManager(mode, blocks, generator, newtx)
    if err != nil {
        t.Fatalf("Failed to create protocol manager: %v", err)
    }
    return pm, db
}

// testTxPool is a fake, helper transaction pool for testing purposes
type testTxPool struct {
    txFeed event.Feed
    pool   []*types.Transaction        // Collection of all transactions
    added  chan<- []*types.Transaction // Notification channel for new transactions

    lock sync.RWMutex // Protects the transaction pool
}

// AddRemotes appends a batch of transactions to the pool, and notifies any
// listeners if the addition channel is non nil
func (p *testTxPool) AddRemotes(txs []*types.Transaction) []error {
    p.lock.Lock()
    defer p.lock.Unlock()

    p.pool = append(p.pool, txs...)
    if p.added != nil {
        p.added <- txs
    }
    return make([]error, len(txs))
}

// Pending returns all the transactions known to the pool
func (p *testTxPool) Pending() (map[common.Address]types.Transactions, error) {
    p.lock.RLock()
    defer p.lock.RUnlock()

    batches := make(map[common.Address]types.Transactions)
    for _, tx := range p.pool {
        from, _ := types.Sender(types.HomesteadSigner{}, tx)
        batches[from] = append(batches[from], tx)
    }
    for _, batch := range batches {
        sort.Sort(types.TxByNonce(batch))
    }
    return batches, nil
}

func (p *testTxPool) SubscribeNewTxsEvent(ch chan<- core.NewTxsEvent) event.Subscription {
    return p.txFeed.Subscribe(ch)
}

// newTestTransaction create a new dummy transaction.
func newTestTransaction(from *ecdsa.PrivateKey, nonce uint64, datasize int) *types.Transaction {
    tx := types.NewTransaction(nonce, common.Address{}, big.NewInt(0), 100000, big.NewInt(0), make([]byte, datasize))
    tx, _ = types.SignTx(tx, types.HomesteadSigner{}, from)
    return tx
}

// testPeer is a simulated peer to allow testing direct network calls.
type testPeer struct {
    net p2p.MsgReadWriter // Network layer reader/writer to simulate remote messaging
    app *p2p.MsgPipeRW    // Application layer reader/writer to simulate the local side
    *peer
}

// newTestPeer creates a new peer registered at the given protocol manager.
func newTestPeer(name string, version int, pm *ProtocolManager, shake bool) (*testPeer, <-chan error) {
    // Create a message pipe to communicate through
    app, net := p2p.MsgPipe()

    // Generate a random id and create the peer
    var id enode.ID
    rand.Read(id[:])

    peer := pm.newPeer(version, p2p.NewPeer(id, name, nil), net)

    // Start the peer on a new thread
    errc := make(chan error, 1)
    go func() {
        select {
        case pm.newPeerCh <- peer:
            errc <- pm.handle(peer)
        case <-pm.quitSync:
            errc <- p2p.DiscQuitting
        }
    }()
    tp := &testPeer{app: app, net: net, peer: peer}
    // Execute any implicitly requested handshakes and return
    if shake {
        var (
            genesis = pm.blockchain.Genesis()
            head    = pm.blockchain.CurrentHeader()
            td      = pm.blockchain.GetTd(head.Hash(), head.Number.Uint64())
        )
        tp.handshake(nil, td, head.Hash(), genesis.Hash())
    }
    return tp, errc
}

// handshake simulates a trivial handshake that expects the same state from the
// remote side as we are simulating locally.
func (p *testPeer) handshake(t *testing.T, td *big.Int, head common.Hash, genesis common.Hash) {
    msg := &statusData{
        ProtocolVersion: uint32(p.version),
        NetworkId:       DefaultConfig.NetworkId,
        TD:              td,
        CurrentBlock:    head,
        GenesisBlock:    genesis,
    }
    if err := p2p.ExpectMsg(p.app, StatusMsg, msg); err != nil {
        t.Fatalf("status recv: %v", err)
    }
    if err := p2p.Send(p.app, StatusMsg, msg); err != nil {
        t.Fatalf("status send: %v", err)
    }
}

// close terminates the local side of the peer, notifying the remote protocol
// manager of termination.
func (p *testPeer) close() {
    p.app.Close()
}