path: root/core/chain_manager_test.go

package core

import (
    "bytes"
    "fmt"
    "math/big"
    "os"
    "path"
    "runtime"
    "strconv"
    "testing"

    "github.com/ethereum/go-ethereum/core/types"
    "github.com/ethereum/go-ethereum/ethdb"
    "github.com/ethereum/go-ethereum/event"
    "github.com/ethereum/go-ethereum/rlp"
)

func init() {
    runtime.GOMAXPROCS(runtime.NumCPU())
}

// Test fork of length N starting from block i
func testFork(t *testing.T, bman *BlockProcessor, i, N int, f func(td1, td2 *big.Int)) {
    // switch databases to process the new chain
    db, err := ethdb.NewMemDatabase()
    if err != nil {
        t.Fatal("Failed to create db:", err)
    }
    // copy old chain up to i into new db with deterministic canonical
    bman2, err := newCanonical(i, db)
    if err != nil {
        t.Fatal("could not make new canonical in testFork", err)
    }
    // asert the bmans have the same block at i
    bi1 := bman.bc.GetBlockByNumber(uint64(i)).Hash()
    bi2 := bman2.bc.GetBlockByNumber(uint64(i)).Hash()
    if bytes.Compare(bi1, bi2) != 0 {
        t.Fatal("chains do not have the same hash at height", i)
    }

    bman2.bc.SetProcessor(bman2)

    // extend the fork
    parent := bman2.bc.CurrentBlock()
    chainB := makeChain(bman2, parent, N, db, ForkSeed)
    err = bman2.bc.InsertChain(chainB)
    if err != nil {
        t.Fatal("Insert chain error for fork:", err)
    }

    tdpre := bman.bc.Td()
    // Test the fork's blocks on the original chain
    td, err := testChain(chainB, bman)
    if err != nil {
        t.Fatal("expected chainB not to give errors:", err)
    }
    // Compare difficulties
    f(tdpre, td)
}

func printChain(bc *ChainManager) {
    for i := bc.CurrentBlock().Number().Uint64(); i > 0; i-- {
        b := bc.GetBlockByNumber(uint64(i))
        fmt.Printf("\t%x\n", b.Hash())
    }
}

// process blocks against a chain
func testChain(chainB types.Blocks, bman *BlockProcessor) (*big.Int, error) {
    td := new(big.Int)
    for _, block := range chainB {
        td2, err := bman.bc.processor.Process(block)
        if err != nil {
            if IsKnownBlockErr(err) {
                continue
            }
            return nil, err
        }
        block.Td = td2
        td = td2

        bman.bc.mu.Lock()
        {
            bman.bc.write(block)
        }
        bman.bc.mu.Unlock()
    }
    return td, nil
}

func loadChain(fn string, t *testing.T) (types.Blocks, error) {
    fh, err := os.OpenFile(path.Join(os.Getenv("GOPATH"), "src", "github.com", "ethereum", "go-ethereum", "_data", fn), os.O_RDONLY, os.ModePerm)
    if err != nil {
        return nil, err
    }
    defer fh.Close()

    var chain types.Blocks
    if err := rlp.Decode(fh, &chain); err != nil {
        return nil, err
    }

    return chain, nil
}

func insertChain(done chan bool, chainMan *ChainManager, chain types.Blocks, t *testing.T) {
    err := chainMan.InsertChain(chain)
    if err != nil {
        fmt.Println(err)
        t.FailNow()
    }
    done <- true
}

func TestExtendCanonical(t *testing.T) {
    CanonicalLength := 5
    db, err := ethdb.NewMemDatabase()
    if err != nil {
        t.Fatal("Failed to create db:", err)
    }
    // make first chain starting from genesis
    bman, err := newCanonical(CanonicalLength, db)
    if err != nil {
        t.Fatal("Could not make new canonical chain:", err)
    }
    f := func(td1, td2 *big.Int) {
        if td2.Cmp(td1) <= 0 {
            t.Error("expected chainB to have higher difficulty. Got", td2, "expected more than", td1)
        }
    }
    // Start fork from current height (CanonicalLength)
    testFork(t, bman, CanonicalLength, 1, f)
    testFork(t, bman, CanonicalLength, 2, f)
    testFork(t, bman, CanonicalLength, 5, f)
    testFork(t, bman, CanonicalLength, 10, f)
}

func TestShorterFork(t *testing.T) {
    db, err := ethdb.NewMemDatabase()
    if err != nil {
        t.Fatal("Failed to create db:", err)
    }
    // make first chain starting from genesis
    bman, err := newCanonical(10, db)
    if err != nil {
        t.Fatal("Could not make new canonical chain:", err)
    }
    f := func(td1, td2 *big.Int) {
        if td2.Cmp(td1) >= 0 {
            t.Error("expected chainB to have lower difficulty. Got", td2, "expected less than", td1)
        }
    }
    // Sum of numbers must be less than 10
    // for this to be a shorter fork
    testFork(t, bman, 0, 3, f)
    testFork(t, bman, 0, 7, f)
    testFork(t, bman, 1, 1, f)
    testFork(t, bman, 1, 7, f)
    testFork(t, bman, 5, 3, f)
    testFork(t, bman, 5, 4, f)
}

func TestLongerFork(t *testing.T) {
    db, err := ethdb.NewMemDatabase()
    if err != nil {
        t.Fatal("Failed to create db:", err)
    }
    // make first chain starting from genesis
    bman, err := newCanonical(10, db)
    if err != nil {
        t.Fatal("Could not make new canonical chain:", err)
    }
    f := func(td1, td2 *big.Int) {
        if td2.Cmp(td1) <= 0 {
            t.Error("expected chainB to have higher difficulty. Got", td2, "expected more than", td1)
        }
    }
    // Sum of numbers must be greater than 10
    // for this to be a longer fork
    testFork(t, bman, 0, 11, f)
    testFork(t, bman, 0, 15, f)
    testFork(t, bman, 1, 10, f)
    testFork(t, bman, 1, 12, f)
    testFork(t, bman, 5, 6, f)
    testFork(t, bman, 5, 8, f)
}

func TestEqualFork(t *testing.T) {
    db, err := ethdb.NewMemDatabase()
    if err != nil {
        t.Fatal("Failed to create db:", err)
    }
    bman, err := newCanonical(10, db)
    if err != nil {
        t.Fatal("Could not make new canonical chain:", err)
    }
    f := func(td1, td2 *big.Int) {
        if td2.Cmp(td1) != 0 {
            t.Error("expected chainB to have equal difficulty. Got", td2, "expected ", td1)
        }
    }
    // Sum of numbers must be equal to 10
    // for this to be an equal fork
    testFork(t, bman, 0, 10, f)
    testFork(t, bman, 1, 9, f)
    testFork(t, bman, 2, 8, f)
    testFork(t, bman, 5, 5, f)
    testFork(t, bman, 6, 4, f)
    testFork(t, bman, 9, 1, f)
}

func TestBrokenChain(t *testing.T) {
    db, err := ethdb.NewMemDatabase()
    if err != nil {
        t.Fatal("Failed to create db:", err)
    }
    bman, err := newCanonical(10, db)
    if err != nil {
        t.Fatal("Could not make new canonical chain:", err)
    }
    db2, err := ethdb.NewMemDatabase()
    if err != nil {
        t.Fatal("Failed to create db:", err)
    }
    bman2, err := newCanonical(10, db2)
    if err != nil {
        t.Fatal("Could not make new canonical chain:", err)
    }
    bman2.bc.SetProcessor(bman2)
    parent := bman2.bc.CurrentBlock()
    chainB := makeChain(bman2, parent, 5, db2, ForkSeed)
    chainB = chainB[1:]
    _, err = testChain(chainB, bman)
    if err == nil {
        t.Error("expected broken chain to return error")
    }
}

func TestChainInsertions(t *testing.T) {
    t.Skip() // travil fails.

    db, _ := ethdb.NewMemDatabase()

    chain1, err := loadChain("valid1", t)
    if err != nil {
        fmt.Println(err)
        t.FailNow()
    }

    chain2, err := loadChain("valid2", t)
    if err != nil {
        fmt.Println(err)
        t.FailNow()
    }

    var eventMux event.TypeMux
    chainMan := NewChainManager(db, db, &eventMux)
    txPool := NewTxPool(&eventMux)
    blockMan := NewBlockProcessor(db, nil, txPool, chainMan, &eventMux)
    chainMan.SetProcessor(blockMan)

    const max = 2
    done := make(chan bool, max)

    go insertChain(done, chainMan, chain1, t)
    go insertChain(done, chainMan, chain2, t)

    for i := 0; i < max; i++ {
        <-done
    }

    if bytes.Equal(chain2[len(chain2)-1].Hash(), chainMan.CurrentBlock().Hash()) {
        t.Error("chain2 is canonical and shouldn't be")
    }

    if !bytes.Equal(chain1[len(chain1)-1].Hash(), chainMan.CurrentBlock().Hash()) {
        t.Error("chain1 isn't canonical and should be")
    }
}

func TestChainMultipleInsertions(t *testing.T) {
    t.Skip() // travil fails.

    db, _ := ethdb.NewMemDatabase()

    const max = 4
    chains := make([]types.Blocks, max)
    var longest int
    for i := 0; i < max; i++ {
        var err error
        name := "valid" + strconv.Itoa(i+1)
        chains[i], err = loadChain(name, t)
        if len(chains[i]) >= len(chains[longest]) {
            longest = i
        }
        fmt.Println("loaded", name, "with a length of", len(chains[i]))
        if err != nil {
            fmt.Println(err)
            t.FailNow()
        }
    }
    var eventMux event.TypeMux
    chainMan := NewChainManager(db, db, &eventMux)
    txPool := NewTxPool(&eventMux)
    blockMan := NewBlockProcessor(db, nil, txPool, chainMan, &eventMux)
    chainMan.SetProcessor(blockMan)
    done := make(chan bool, max)
    for i, chain := range chains {
        // XXX the go routine would otherwise reference the same (chain[3]) variable and fail
        i := i
        chain := chain
        go func() {
            insertChain(done, chainMan, chain, t)
            fmt.Println(i, "done")
        }()
    }

    for i := 0; i < max; i++ {
        <-done
    }

    if !bytes.Equal(chains[longest][len(chains[longest])-1].Hash(), chainMan.CurrentBlock().Hash()) {
        t.Error("Invalid canonical chain")
    }
}

func TestGetAncestors(t *testing.T) {
    t.Skip() // travil fails.

    db, _ := ethdb.NewMemDatabase()
    var eventMux event.TypeMux
    chainMan := NewChainManager(db, db, &eventMux)
    chain, err := loadChain("valid1", t)
    if err != nil {
        fmt.Println(err)
        t.FailNow()
    }

    for _, block := range chain {
        chainMan.write(block)
    }

    ancestors := chainMan.GetAncestors(chain[len(chain)-1], 4)
    fmt.Println(ancestors)
}