mirror of
https://github.com/ethereum/go-ethereum.git
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221 lines
6.7 KiB
Go
221 lines
6.7 KiB
Go
// Copyright 2018 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package stream
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import (
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"context"
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crand "crypto/rand"
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"fmt"
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"io"
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"math"
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"testing"
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"time"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/p2p/discover"
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"github.com/ethereum/go-ethereum/p2p/simulations"
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"github.com/ethereum/go-ethereum/rpc"
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"github.com/ethereum/go-ethereum/swarm/network"
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streamTesting "github.com/ethereum/go-ethereum/swarm/network/stream/testing"
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"github.com/ethereum/go-ethereum/swarm/storage"
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)
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const dataChunkCount = 500
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func TestSyncerSimulation(t *testing.T) {
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testSyncBetweenNodes(t, 2, 1, dataChunkCount, true, 1)
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testSyncBetweenNodes(t, 4, 1, dataChunkCount, true, 1)
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testSyncBetweenNodes(t, 8, 1, dataChunkCount, true, 1)
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testSyncBetweenNodes(t, 16, 1, dataChunkCount, true, 1)
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}
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func testSyncBetweenNodes(t *testing.T, nodes, conns, chunkCount int, skipCheck bool, po uint8) {
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defaultSkipCheck = skipCheck
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toAddr = func(id discover.NodeID) *network.BzzAddr {
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addr := network.NewAddrFromNodeID(id)
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addr.OAddr[0] = byte(0)
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return addr
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}
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conf := &streamTesting.RunConfig{
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Adapter: *adapter,
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NodeCount: nodes,
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ConnLevel: conns,
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ToAddr: toAddr,
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Services: services,
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EnableMsgEvents: false,
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}
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// create context for simulation run
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timeout := 30 * time.Second
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ctx, cancel := context.WithTimeout(context.Background(), timeout)
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// defer cancel should come before defer simulation teardown
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defer cancel()
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// create simulation network with the config
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sim, teardown, err := streamTesting.NewSimulation(conf)
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defer teardown()
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if err != nil {
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t.Fatal(err.Error())
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}
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// HACK: these are global variables in the test so that they are available for
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// the service constructor function
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// TODO: will this work with exec/docker adapter?
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// localstore of nodes made available for action and check calls
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stores = make(map[discover.NodeID]storage.ChunkStore)
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nodeIndex := make(map[discover.NodeID]int)
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for i, id := range sim.IDs {
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nodeIndex[id] = i
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stores[id] = sim.Stores[i]
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}
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deliveries = make(map[discover.NodeID]*Delivery)
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// peerCount function gives the number of peer connections for a nodeID
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// this is needed for the service run function to wait until
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// each protocol instance runs and the streamer peers are available
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peerCount = func(id discover.NodeID) int {
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if sim.IDs[0] == id || sim.IDs[nodes-1] == id {
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return 1
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}
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return 2
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}
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waitPeerErrC = make(chan error)
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// here we distribute chunks of a random file into stores 1...nodes
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rrdpa := storage.NewDPA(newRoundRobinStore(sim.Stores[1:]...), storage.NewChunkerParams())
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rrdpa.Start()
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size := chunkCount * chunkSize
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_, wait, err := rrdpa.Store(io.LimitReader(crand.Reader, int64(size)), int64(size))
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// need to wait cos we then immediately collect the relevant bin content
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wait()
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defer rrdpa.Stop()
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if err != nil {
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t.Fatal(err.Error())
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}
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// create DBAPI-s for all nodes
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dbs := make([]*storage.DBAPI, nodes)
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for i := 0; i < nodes; i++ {
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dbs[i] = storage.NewDBAPI(sim.Stores[i].(*storage.LocalStore))
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}
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// collect hashes in po 1 bin for each node
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hashes := make([][]storage.Key, nodes)
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totalHashes := 0
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hashCounts := make([]int, nodes)
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for i := nodes - 1; i >= 0; i-- {
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if i < nodes-1 {
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hashCounts[i] = hashCounts[i+1]
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}
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dbs[i].Iterator(0, math.MaxUint64, po, func(key storage.Key, index uint64) bool {
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hashes[i] = append(hashes[i], key)
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totalHashes++
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hashCounts[i]++
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return true
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})
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}
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// errc is error channel for simulation
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errc := make(chan error, 1)
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quitC := make(chan struct{})
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defer close(quitC)
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// action is subscribe
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action := func(ctx context.Context) error {
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// need to wait till an aynchronous process registers the peers in streamer.peers
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// that is used by Subscribe
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// the global peerCount function tells how many connections each node has
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// TODO: this is to be reimplemented with peerEvent watcher without global var
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i := 0
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for err := range waitPeerErrC {
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if err != nil {
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return fmt.Errorf("error waiting for peers: %s", err)
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}
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i++
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if i == nodes {
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break
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}
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}
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// each node Subscribes to each other's swarmChunkServerStreamName
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for j := 0; j < nodes-1; j++ {
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id := sim.IDs[j]
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err := sim.CallClient(id, func(client *rpc.Client) error {
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// report disconnect events to the error channel cos peers should not disconnect
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err := streamTesting.WatchDisconnections(id, client, errc, quitC)
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if err != nil {
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return err
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}
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ctx, cancel := context.WithTimeout(ctx, 1*time.Second)
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defer cancel()
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// start syncing, i.e., subscribe to upstream peers po 1 bin
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sid := sim.IDs[j+1]
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return client.CallContext(ctx, nil, "stream_subscribeStream", sid, NewStream("SYNC", []byte{1}, false), &Range{From: 0, To: 0}, Top)
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})
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if err != nil {
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return err
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}
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}
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return nil
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}
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// this makes sure check is not called before the previous call finishes
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check := func(ctx context.Context, id discover.NodeID) (bool, error) {
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select {
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case err := <-errc:
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return false, err
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case <-ctx.Done():
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return false, ctx.Err()
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default:
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}
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i := nodeIndex[id]
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var total, found int
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for j := i; j < nodes; j++ {
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total += len(hashes[j])
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for _, key := range hashes[j] {
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chunk, err := dbs[i].Get(key)
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if err == storage.ErrFetching {
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<-chunk.ReqC
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} else if err != nil {
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continue
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}
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// needed for leveldb not to be closed?
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// chunk.WaitToStore()
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found++
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}
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}
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log.Debug("sync check", "node", id, "index", i, "bin", po, "found", found, "total", total)
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return total == found, nil
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}
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conf.Step = &simulations.Step{
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Action: action,
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Trigger: streamTesting.Trigger(500*time.Millisecond, quitC, sim.IDs[0:nodes-1]...),
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Expect: &simulations.Expectation{
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Nodes: sim.IDs[0:1],
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Check: check,
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},
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}
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startedAt := time.Now()
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result, err := sim.Run(ctx, conf)
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finishedAt := time.Now()
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if err != nil {
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t.Fatalf("Setting up simulation failed: %v", err)
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}
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if result.Error != nil {
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t.Fatalf("Simulation failed: %s", result.Error)
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}
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streamTesting.CheckResult(t, result, startedAt, finishedAt)
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}
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