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path: root/consensus/ethash/sealer_test.go
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package ethash

import (
    "encoding/json"
    "io/ioutil"
    "math/big"
    "net"
    "net/http"
    "testing"
    "time"

    "github.com/dexon-foundation/dexon/common"
    "github.com/dexon-foundation/dexon/core/types"
)

// Tests whether remote HTTP servers are correctly notified of new work.
func TestRemoteNotify(t *testing.T) {
    // Start a simple webserver to capture notifications
    sink := make(chan [3]string)

    server := &http.Server{
        Handler: http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
            blob, err := ioutil.ReadAll(req.Body)
            if err != nil {
                t.Fatalf("failed to read miner notification: %v", err)
            }
            var work [3]string
            if err := json.Unmarshal(blob, &work); err != nil {
                t.Fatalf("failed to unmarshal miner notification: %v", err)
            }
            sink <- work
        }),
    }
    // Open a custom listener to extract its local address
    listener, err := net.Listen("tcp", "localhost:0")
    if err != nil {
        t.Fatalf("failed to open notification server: %v", err)
    }
    defer listener.Close()

    go server.Serve(listener)

    // Wait for server to start listening
    var tries int
    for tries = 0; tries < 10; tries++ {
        conn, _ := net.DialTimeout("tcp", listener.Addr().String(), 1*time.Second)
        if conn != nil {
            break
        }
    }
    if tries == 10 {
        t.Fatal("tcp listener not ready for more than 10 seconds")
    }

    // Create the custom ethash engine
    ethash := NewTester([]string{"http://" + listener.Addr().String()}, false)
    defer ethash.Close()

    // Stream a work task and ensure the notification bubbles out
    header := &types.Header{Number: big.NewInt(1), Difficulty: big.NewInt(100)}
    block := types.NewBlockWithHeader(header)

    ethash.Seal(nil, block, nil, nil)
    select {
    case work := <-sink:
        if want := ethash.SealHash(header).Hex(); work[0] != want {
            t.Errorf("work packet hash mismatch: have %s, want %s", work[0], want)
        }
        if want := common.BytesToHash(SeedHash(header.Number.Uint64())).Hex(); work[1] != want {
            t.Errorf("work packet seed mismatch: have %s, want %s", work[1], want)
        }
        target := new(big.Int).Div(new(big.Int).Lsh(big.NewInt(1), 256), header.Difficulty)
        if want := common.BytesToHash(target.Bytes()).Hex(); work[2] != want {
            t.Errorf("work packet target mismatch: have %s, want %s", work[2], want)
        }
    case <-time.After(3 * time.Second):
        t.Fatalf("notification timed out")
    }
}

// Tests that pushing work packages fast to the miner doesn't cause any data race
// issues in the notifications.
func TestRemoteMultiNotify(t *testing.T) {
    // Start a simple webserver to capture notifications
    sink := make(chan [3]string, 64)

    server := &http.Server{
        Handler: http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
            blob, err := ioutil.ReadAll(req.Body)
            if err != nil {
                t.Fatalf("failed to read miner notification: %v", err)
            }
            var work [3]string
            if err := json.Unmarshal(blob, &work); err != nil {
                t.Fatalf("failed to unmarshal miner notification: %v", err)
            }
            sink <- work
        }),
    }
    // Open a custom listener to extract its local address
    listener, err := net.Listen("tcp", "localhost:0")
    if err != nil {
        t.Fatalf("failed to open notification server: %v", err)
    }
    defer listener.Close()

    go server.Serve(listener)

    // Create the custom ethash engine
    ethash := NewTester([]string{"http://" + listener.Addr().String()}, false)
    defer ethash.Close()

    // Stream a lot of work task and ensure all the notifications bubble out
    for i := 0; i < cap(sink); i++ {
        header := &types.Header{Number: big.NewInt(int64(i)), Difficulty: big.NewInt(100)}
        block := types.NewBlockWithHeader(header)

        ethash.Seal(nil, block, nil, nil)
    }
    for i := 0; i < cap(sink); i++ {
        select {
        case <-sink:
        case <-time.After(3 * time.Second):
            t.Fatalf("notification %d timed out", i)
        }
    }
}

// Tests whether stale solutions are correctly processed.
func TestStaleSubmission(t *testing.T) {
    ethash := NewTester(nil, true)
    defer ethash.Close()
    api := &API{ethash}

    fakeNonce, fakeDigest := types.BlockNonce{0x01, 0x02, 0x03}, common.HexToHash("deadbeef")

    testcases := []struct {
        headers     []*types.Header
        submitIndex int
        submitRes   bool
    }{
        // Case1: submit solution for the latest mining package
        {
            []*types.Header{
                {ParentHash: common.BytesToHash([]byte{0xa}), Number: big.NewInt(1), Difficulty: big.NewInt(100000000)},
            },
            0,
            true,
        },
        // Case2: submit solution for the previous package but have same parent.
        {
            []*types.Header{
                {ParentHash: common.BytesToHash([]byte{0xb}), Number: big.NewInt(2), Difficulty: big.NewInt(100000000)},
                {ParentHash: common.BytesToHash([]byte{0xb}), Number: big.NewInt(2), Difficulty: big.NewInt(100000001)},
            },
            0,
            true,
        },
        // Case3: submit stale but acceptable solution
        {
            []*types.Header{
                {ParentHash: common.BytesToHash([]byte{0xc}), Number: big.NewInt(3), Difficulty: big.NewInt(100000000)},
                {ParentHash: common.BytesToHash([]byte{0xd}), Number: big.NewInt(9), Difficulty: big.NewInt(100000000)},
            },
            0,
            true,
        },
        // Case4: submit very old solution
        {
            []*types.Header{
                {ParentHash: common.BytesToHash([]byte{0xe}), Number: big.NewInt(10), Difficulty: big.NewInt(100000000)},
                {ParentHash: common.BytesToHash([]byte{0xf}), Number: big.NewInt(17), Difficulty: big.NewInt(100000000)},
            },
            0,
            false,
        },
    }
    results := make(chan *types.Block, 16)

    for id, c := range testcases {
        for _, h := range c.headers {
            ethash.Seal(nil, types.NewBlockWithHeader(h), results, nil)
        }
        if res := api.SubmitWork(fakeNonce, ethash.SealHash(c.headers[c.submitIndex]), fakeDigest); res != c.submitRes {
            t.Errorf("case %d submit result mismatch, want %t, get %t", id+1, c.submitRes, res)
        }
        if !c.submitRes {
            continue
        }
        select {
        case res := <-results:
            if res.Header().Nonce != fakeNonce {
                t.Errorf("case %d block nonce mismatch, want %s, get %s", id+1, fakeNonce, res.Header().Nonce)
            }
            if res.Header().MixDigest != fakeDigest {
                t.Errorf("case %d block digest mismatch, want %s, get %s", id+1, fakeDigest, res.Header().MixDigest)
            }
            if res.Header().Difficulty.Uint64() != c.headers[c.submitIndex].Difficulty.Uint64() {
                t.Errorf("case %d block difficulty mismatch, want %d, get %d", id+1, c.headers[c.submitIndex].Difficulty, res.Header().Difficulty)
            }
            if res.Header().Number.Uint64() != c.headers[c.submitIndex].Number.Uint64() {
                t.Errorf("case %d block number mismatch, want %d, get %d", id+1, c.headers[c.submitIndex].Number.Uint64(), res.Header().Number.Uint64())
            }
            if res.Header().ParentHash != c.headers[c.submitIndex].ParentHash {
                t.Errorf("case %d block parent hash mismatch, want %s, get %s", id+1, c.headers[c.submitIndex].ParentHash.Hex(), res.Header().ParentHash.Hex())
            }
        case <-time.NewTimer(time.Second).C:
            t.Errorf("case %d fetch ethash result timeout", id+1)
        }
    }
}