path: root/swarm/network/stream/intervals_test.go

// Copyright 2018 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 stream

import (
    "context"
    "encoding/binary"
    "errors"
    "fmt"
    "sync"
    "testing"
    "time"

    "github.com/dexon-foundation/dexon/log"
    "github.com/dexon-foundation/dexon/node"
    "github.com/dexon-foundation/dexon/p2p/enode"
    "github.com/dexon-foundation/dexon/p2p/simulations/adapters"
    "github.com/dexon-foundation/dexon/swarm/network/simulation"
    "github.com/dexon-foundation/dexon/swarm/state"
    "github.com/dexon-foundation/dexon/swarm/storage"
    "github.com/dexon-foundation/dexon/swarm/testutil"
)

func TestIntervalsLive(t *testing.T) {
    testIntervals(t, true, nil, false)
    testIntervals(t, true, nil, true)
}

func TestIntervalsHistory(t *testing.T) {
    testIntervals(t, false, NewRange(9, 26), false)
    testIntervals(t, false, NewRange(9, 26), true)
}

func TestIntervalsLiveAndHistory(t *testing.T) {
    testIntervals(t, true, NewRange(9, 26), false)
    testIntervals(t, true, NewRange(9, 26), true)
}

func testIntervals(t *testing.T, live bool, history *Range, skipCheck bool) {

    nodes := 2
    chunkCount := dataChunkCount
    externalStreamName := "externalStream"
    externalStreamSessionAt := uint64(50)
    externalStreamMaxKeys := uint64(100)

    sim := simulation.New(map[string]simulation.ServiceFunc{
        "intervalsStreamer": func(ctx *adapters.ServiceContext, bucket *sync.Map) (node.Service, func(), error) {
            addr, netStore, delivery, clean, err := newNetStoreAndDelivery(ctx, bucket)
            if err != nil {
                return nil, nil, err
            }

            r := NewRegistry(addr.ID(), delivery, netStore, state.NewInmemoryStore(), &RegistryOptions{
                Retrieval: RetrievalDisabled,
                Syncing:   SyncingRegisterOnly,
                SkipCheck: skipCheck,
            }, nil)
            bucket.Store(bucketKeyRegistry, r)

            r.RegisterClientFunc(externalStreamName, func(p *Peer, t string, live bool) (Client, error) {
                return newTestExternalClient(netStore), nil
            })
            r.RegisterServerFunc(externalStreamName, func(p *Peer, t string, live bool) (Server, error) {
                return newTestExternalServer(t, externalStreamSessionAt, externalStreamMaxKeys, nil), nil
            })

            cleanup := func() {
                r.Close()
                clean()
            }

            return r, cleanup, nil
        },
    })
    defer sim.Close()

    log.Info("Adding nodes to simulation")
    _, err := sim.AddNodesAndConnectChain(nodes)
    if err != nil {
        t.Fatal(err)
    }

    ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
    defer cancel()

    if _, err := sim.WaitTillHealthy(ctx); err != nil {
        t.Fatal(err)
    }

    result := sim.Run(ctx, func(ctx context.Context, sim *simulation.Simulation) (err error) {
        nodeIDs := sim.UpNodeIDs()
        storer := nodeIDs[0]
        checker := nodeIDs[1]

        item, ok := sim.NodeItem(storer, bucketKeyFileStore)
        if !ok {
            return fmt.Errorf("No filestore")
        }
        fileStore := item.(*storage.FileStore)

        size := chunkCount * chunkSize

        _, wait, err := fileStore.Store(ctx, testutil.RandomReader(1, size), int64(size), false)
        if err != nil {
            return fmt.Errorf("store: %v", err)
        }
        err = wait(ctx)
        if err != nil {
            return fmt.Errorf("wait store: %v", err)
        }

        item, ok = sim.NodeItem(checker, bucketKeyRegistry)
        if !ok {
            return fmt.Errorf("No registry")
        }
        registry := item.(*Registry)

        liveErrC := make(chan error)
        historyErrC := make(chan error)

        err = registry.Subscribe(storer, NewStream(externalStreamName, "", live), history, Top)
        if err != nil {
            return err
        }

        disconnected := watchDisconnections(ctx, sim)
        defer func() {
            if err != nil && disconnected.bool() {
                err = errors.New("disconnect events received")
            }
        }()

        go func() {
            if !live {
                close(liveErrC)
                return
            }

            var err error
            defer func() {
                liveErrC <- err
            }()

            // live stream
            var liveHashesChan chan []byte
            liveHashesChan, err = getHashes(ctx, registry, storer, NewStream(externalStreamName, "", true))
            if err != nil {
                log.Error("get hashes", "err", err)
                return
            }
            i := externalStreamSessionAt

            // we have subscribed, enable notifications
            err = enableNotifications(registry, storer, NewStream(externalStreamName, "", true))
            if err != nil {
                return
            }

            for {
                select {
                case hash := <-liveHashesChan:
                    h := binary.BigEndian.Uint64(hash)
                    if h != i {
                        err = fmt.Errorf("expected live hash %d, got %d", i, h)
                        return
                    }
                    i++
                    if i > externalStreamMaxKeys {
                        return
                    }
                case <-ctx.Done():
                    return
                }
            }
        }()

        go func() {
            if live && history == nil {
                close(historyErrC)
                return
            }

            var err error
            defer func() {
                historyErrC <- err
            }()

            // history stream
            var historyHashesChan chan []byte
            historyHashesChan, err = getHashes(ctx, registry, storer, NewStream(externalStreamName, "", false))
            if err != nil {
                log.Error("get hashes", "err", err)
                return
            }

            var i uint64
            historyTo := externalStreamMaxKeys
            if history != nil {
                i = history.From
                if history.To != 0 {
                    historyTo = history.To
                }
            }

            // we have subscribed, enable notifications
            err = enableNotifications(registry, storer, NewStream(externalStreamName, "", false))
            if err != nil {
                return
            }

            for {
                select {
                case hash := <-historyHashesChan:
                    h := binary.BigEndian.Uint64(hash)
                    if h != i {
                        err = fmt.Errorf("expected history hash %d, got %d", i, h)
                        return
                    }
                    i++
                    if i > historyTo {
                        return
                    }
                case <-ctx.Done():
                    return
                }
            }
        }()

        if err := <-liveErrC; err != nil {
            return err
        }
        if err := <-historyErrC; err != nil {
            return err
        }

        return nil
    })

    if result.Error != nil {
        t.Fatal(result.Error)
    }
}

func getHashes(ctx context.Context, r *Registry, peerID enode.ID, s Stream) (chan []byte, error) {
    peer := r.getPeer(peerID)

    client, err := peer.getClient(ctx, s)
    if err != nil {
        return nil, err
    }

    c := client.Client.(*testExternalClient)

    return c.hashes, nil
}

func enableNotifications(r *Registry, peerID enode.ID, s Stream) error {
    peer := r.getPeer(peerID)

    ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
    defer cancel()

    client, err := peer.getClient(ctx, s)
    if err != nil {
        return err
    }

    close(client.Client.(*testExternalClient).enableNotificationsC)

    return nil
}

type testExternalClient struct {
    hashes               chan []byte
    store                storage.SyncChunkStore
    enableNotificationsC chan struct{}
}

func newTestExternalClient(store storage.SyncChunkStore) *testExternalClient {
    return &testExternalClient{
        hashes:               make(chan []byte),
        store:                store,
        enableNotificationsC: make(chan struct{}),
    }
}

func (c *testExternalClient) NeedData(ctx context.Context, hash []byte) func(context.Context) error {
    wait := c.store.FetchFunc(ctx, storage.Address(hash))
    if wait == nil {
        return nil
    }
    select {
    case c.hashes <- hash:
    case <-ctx.Done():
        log.Warn("testExternalClient NeedData context", "err", ctx.Err())
        return func(_ context.Context) error {
            return ctx.Err()
        }
    }
    return wait
}

func (c *testExternalClient) BatchDone(Stream, uint64, []byte, []byte) func() (*TakeoverProof, error) {
    return nil
}

func (c *testExternalClient) Close() {}

type testExternalServer struct {
    t         string
    keyFunc   func(key []byte, index uint64)
    sessionAt uint64
    maxKeys   uint64
}

func newTestExternalServer(t string, sessionAt, maxKeys uint64, keyFunc func(key []byte, index uint64)) *testExternalServer {
    if keyFunc == nil {
        keyFunc = binary.BigEndian.PutUint64
    }
    return &testExternalServer{
        t:         t,
        keyFunc:   keyFunc,
        sessionAt: sessionAt,
        maxKeys:   maxKeys,
    }
}

func (s *testExternalServer) SessionIndex() (uint64, error) {
    return s.sessionAt, nil
}

func (s *testExternalServer) SetNextBatch(from uint64, to uint64) ([]byte, uint64, uint64, *HandoverProof, error) {
    if to > s.maxKeys {
        to = s.maxKeys
    }
    b := make([]byte, HashSize*(to-from+1))
    for i := from; i <= to; i++ {
        s.keyFunc(b[(i-from)*HashSize:(i-from+1)*HashSize], i)
    }
    return b, from, to, nil, nil
}

func (s *testExternalServer) GetData(context.Context, []byte) ([]byte, error) {
    return make([]byte, 4096), nil
}

func (s *testExternalServer) Close() {}