path: root/swarm/network/stream/syncer_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"
    crand "crypto/rand"
    "fmt"
    "io"
    "io/ioutil"
    "math"
    "sync"
    "testing"
    "time"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/p2p/discover"
    "github.com/ethereum/go-ethereum/p2p/simulations"
    "github.com/ethereum/go-ethereum/rpc"
    "github.com/ethereum/go-ethereum/swarm/log"
    "github.com/ethereum/go-ethereum/swarm/network"
    streamTesting "github.com/ethereum/go-ethereum/swarm/network/stream/testing"
    "github.com/ethereum/go-ethereum/swarm/storage"
)

const dataChunkCount = 200

func TestSyncerSimulation(t *testing.T) {
    testSyncBetweenNodes(t, 2, 1, dataChunkCount, true, 1)
    testSyncBetweenNodes(t, 4, 1, dataChunkCount, true, 1)
    testSyncBetweenNodes(t, 8, 1, dataChunkCount, true, 1)
    testSyncBetweenNodes(t, 16, 1, dataChunkCount, true, 1)
}

func createMockStore(id discover.NodeID, addr *network.BzzAddr) (storage.ChunkStore, error) {
    var err error
    address := common.BytesToAddress(id.Bytes())
    mockStore := globalStore.NewNodeStore(address)
    params := storage.NewDefaultLocalStoreParams()
    datadirs[id], err = ioutil.TempDir("", "localMockStore-"+id.TerminalString())
    if err != nil {
        return nil, err
    }
    params.Init(datadirs[id])
    params.BaseKey = addr.Over()
    lstore, err := storage.NewLocalStore(params, mockStore)
    return lstore, nil
}

func testSyncBetweenNodes(t *testing.T, nodes, conns, chunkCount int, skipCheck bool, po uint8) {
    defer setDefaultSkipCheck(defaultSkipCheck)
    defaultSkipCheck = skipCheck
    //data directories for each node and store
    datadirs = make(map[discover.NodeID]string)
    if *useMockStore {
        createStoreFunc = createMockStore
        createGlobalStore()
    } else {
        createStoreFunc = createTestLocalStorageFromSim
    }
    defer datadirsCleanup()

    registries = make(map[discover.NodeID]*TestRegistry)
    toAddr = func(id discover.NodeID) *network.BzzAddr {
        addr := network.NewAddrFromNodeID(id)
        //hack to put addresses in same space
        addr.OAddr[0] = byte(0)
        return addr
    }
    conf := &streamTesting.RunConfig{
        Adapter:         *adapter,
        NodeCount:       nodes,
        ConnLevel:       conns,
        ToAddr:          toAddr,
        Services:        services,
        EnableMsgEvents: false,
    }
    // HACK: these are global variables in the test so that they are available for
    // the service constructor function
    // TODO: will this work with exec/docker adapter?
    // localstore of nodes made available for action and check calls
    stores = make(map[discover.NodeID]storage.ChunkStore)
    deliveries = make(map[discover.NodeID]*Delivery)
    // create context for simulation run
    timeout := 30 * time.Second
    ctx, cancel := context.WithTimeout(context.Background(), timeout)
    // defer cancel should come before defer simulation teardown
    defer cancel()

    // create simulation network with the config
    sim, teardown, err := streamTesting.NewSimulation(conf)
    var rpcSubscriptionsWg sync.WaitGroup
    defer func() {
        rpcSubscriptionsWg.Wait()
        teardown()
    }()
    if err != nil {
        t.Fatal(err.Error())
    }

    nodeIndex := make(map[discover.NodeID]int)
    for i, id := range sim.IDs {
        nodeIndex[id] = i
        if !*useMockStore {
            stores[id] = sim.Stores[i]
            sim.Stores[i] = stores[id]
        }
    }
    // peerCount function gives the number of peer connections for a nodeID
    // this is needed for the service run function to wait until
    // each protocol  instance runs and the streamer peers are available
    peerCount = func(id discover.NodeID) int {
        if sim.IDs[0] == id || sim.IDs[nodes-1] == id {
            return 1
        }
        return 2
    }
    waitPeerErrC = make(chan error)

    // create DBAPI-s for all nodes
    dbs := make([]*storage.DBAPI, nodes)
    for i := 0; i < nodes; i++ {
        dbs[i] = storage.NewDBAPI(sim.Stores[i].(*storage.LocalStore))
    }

    // collect hashes in po 1 bin for each node
    hashes := make([][]storage.Address, nodes)
    totalHashes := 0
    hashCounts := make([]int, nodes)
    for i := nodes - 1; i >= 0; i-- {
        if i < nodes-1 {
            hashCounts[i] = hashCounts[i+1]
        }
        dbs[i].Iterator(0, math.MaxUint64, po, func(addr storage.Address, index uint64) bool {
            hashes[i] = append(hashes[i], addr)
            totalHashes++
            hashCounts[i]++
            return true
        })
    }

    // errc is error channel for simulation
    errc := make(chan error, 1)
    quitC := make(chan struct{})
    defer close(quitC)

    // action is subscribe
    action := func(ctx context.Context) error {
        // need to wait till an aynchronous process registers the peers in streamer.peers
        // that is used by Subscribe
        // the global peerCount function tells how many connections each node has
        // TODO: this is to be reimplemented with peerEvent watcher without global var
        i := 0
        for err := range waitPeerErrC {
            if err != nil {
                return fmt.Errorf("error waiting for peers: %s", err)
            }
            i++
            if i == nodes {
                break
            }
        }
        // each node Subscribes to each other's swarmChunkServerStreamName
        for j := 0; j < nodes-1; j++ {
            id := sim.IDs[j]
            sim.Stores[j] = stores[id]
            err := sim.CallClient(id, func(client *rpc.Client) error {
                // report disconnect events to the error channel cos peers should not disconnect
                doneC, err := streamTesting.WatchDisconnections(id, client, errc, quitC)
                if err != nil {
                    return err
                }
                rpcSubscriptionsWg.Add(1)
                go func() {
                    <-doneC
                    rpcSubscriptionsWg.Done()
                }()
                ctx, cancel := context.WithTimeout(ctx, 1*time.Second)
                defer cancel()
                // start syncing, i.e., subscribe to upstream peers po 1 bin
                sid := sim.IDs[j+1]
                return client.CallContext(ctx, nil, "stream_subscribeStream", sid, NewStream("SYNC", FormatSyncBinKey(1), false), NewRange(0, 0), Top)
            })
            if err != nil {
                return err
            }
        }
        // here we distribute chunks of a random file into stores 1...nodes
        rrFileStore := storage.NewFileStore(newRoundRobinStore(sim.Stores[1:]...), storage.NewFileStoreParams())
        size := chunkCount * chunkSize
        _, wait, err := rrFileStore.Store(io.LimitReader(crand.Reader, int64(size)), int64(size), false)
        // need to wait cos we then immediately collect the relevant bin content
        wait()
        if err != nil {
            t.Fatal(err.Error())
        }

        return nil
    }

    // this makes sure check is not called before the previous call finishes
    check := func(ctx context.Context, id discover.NodeID) (bool, error) {
        select {
        case err := <-errc:
            return false, err
        case <-ctx.Done():
            return false, ctx.Err()
        default:
        }

        i := nodeIndex[id]
        var total, found int

        for j := i; j < nodes; j++ {
            total += len(hashes[j])
            for _, key := range hashes[j] {
                chunk, err := dbs[i].Get(key)
                if err == storage.ErrFetching {
                    <-chunk.ReqC
                } else if err != nil {
                    continue
                }
                // needed for leveldb not to be closed?
                // chunk.WaitToStore()
                found++
            }
        }
        log.Debug("sync check", "node", id, "index", i, "bin", po, "found", found, "total", total)
        return total == found, nil
    }

    conf.Step = &simulations.Step{
        Action:  action,
        Trigger: streamTesting.Trigger(500*time.Millisecond, quitC, sim.IDs[0:nodes-1]...),
        Expect: &simulations.Expectation{
            Nodes: sim.IDs[0:1],
            Check: check,
        },
    }
    startedAt := time.Now()
    result, err := sim.Run(ctx, conf)
    finishedAt := time.Now()
    if err != nil {
        t.Fatalf("Setting up simulation failed: %v", err)
    }
    if result.Error != nil {
        t.Fatalf("Simulation failed: %s", result.Error)
    }
    streamTesting.CheckResult(t, result, startedAt, finishedAt)
}