plugeth/swarm/storage/netstore_test.go

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// 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 storage
import (
"bytes"
"context"
"crypto/rand"
"errors"
"fmt"
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"io/ioutil"
"sync"
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"testing"
"time"
"github.com/ethereum/go-ethereum/common"
all: new p2p node representation (#17643) Package p2p/enode provides a generalized representation of p2p nodes which can contain arbitrary information in key/value pairs. It is also the new home for the node database. The "v4" identity scheme is also moved here from p2p/enr to remove the dependency on Ethereum crypto from that package. Record signature handling is changed significantly. The identity scheme registry is removed and acceptable schemes must be passed to any method that needs identity. This means records must now be validated explicitly after decoding. The enode API is designed to make signature handling easy and safe: most APIs around the codebase work with enode.Node, which is a wrapper around a valid record. Going from enr.Record to enode.Node requires a valid signature. * p2p/discover: port to p2p/enode This ports the discovery code to the new node representation in p2p/enode. The wire protocol is unchanged, this can be considered a refactoring change. The Kademlia table can now deal with nodes using an arbitrary identity scheme. This requires a few incompatible API changes: - Table.Lookup is not available anymore. It used to take a public key as argument because v4 protocol requires one. Its replacement is LookupRandom. - Table.Resolve takes *enode.Node instead of NodeID. This is also for v4 protocol compatibility because nodes cannot be looked up by ID alone. - Types Node and NodeID are gone. Further commits in the series will be fixes all over the the codebase to deal with those removals. * p2p: port to p2p/enode and discovery changes This adapts package p2p to the changes in p2p/discover. All uses of discover.Node and discover.NodeID are replaced by their equivalents from p2p/enode. New API is added to retrieve the enode.Node instance of a peer. The behavior of Server.Self with discovery disabled is improved. It now tries much harder to report a working IP address, falling back to 127.0.0.1 if no suitable address can be determined through other means. These changes were needed for tests of other packages later in the series. * p2p/simulations, p2p/testing: port to p2p/enode No surprises here, mostly replacements of discover.Node, discover.NodeID with their new equivalents. The 'interesting' API changes are: - testing.ProtocolSession tracks complete nodes, not just their IDs. - adapters.NodeConfig has a new method to create a complete node. These changes were needed to make swarm tests work. Note that the NodeID change makes the code incompatible with old simulation snapshots. * whisper/whisperv5, whisper/whisperv6: port to p2p/enode This port was easy because whisper uses []byte for node IDs and URL strings in the API. * eth: port to p2p/enode Again, easy to port because eth uses strings for node IDs and doesn't care about node information in any way. * les: port to p2p/enode Apart from replacing discover.NodeID with enode.ID, most changes are in the server pool code. It now deals with complete nodes instead of (Pubkey, IP, Port) triples. The database format is unchanged for now, but we should probably change it to use the node database later. * node: port to p2p/enode This change simply replaces discover.Node and discover.NodeID with their new equivalents. * swarm/network: port to p2p/enode Swarm has its own node address representation, BzzAddr, containing both an overlay address (the hash of a secp256k1 public key) and an underlay address (enode:// URL). There are no changes to the BzzAddr format in this commit, but certain operations such as creating a BzzAddr from a node ID are now impossible because node IDs aren't public keys anymore. Most swarm-related changes in the series remove uses of NewAddrFromNodeID, replacing it with NewAddr which takes a complete node as argument. ToOverlayAddr is removed because we can just use the node ID directly.
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"github.com/ethereum/go-ethereum/p2p/enode"
ch "github.com/ethereum/go-ethereum/swarm/chunk"
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)
all: new p2p node representation (#17643) Package p2p/enode provides a generalized representation of p2p nodes which can contain arbitrary information in key/value pairs. It is also the new home for the node database. The "v4" identity scheme is also moved here from p2p/enr to remove the dependency on Ethereum crypto from that package. Record signature handling is changed significantly. The identity scheme registry is removed and acceptable schemes must be passed to any method that needs identity. This means records must now be validated explicitly after decoding. The enode API is designed to make signature handling easy and safe: most APIs around the codebase work with enode.Node, which is a wrapper around a valid record. Going from enr.Record to enode.Node requires a valid signature. * p2p/discover: port to p2p/enode This ports the discovery code to the new node representation in p2p/enode. The wire protocol is unchanged, this can be considered a refactoring change. The Kademlia table can now deal with nodes using an arbitrary identity scheme. This requires a few incompatible API changes: - Table.Lookup is not available anymore. It used to take a public key as argument because v4 protocol requires one. Its replacement is LookupRandom. - Table.Resolve takes *enode.Node instead of NodeID. This is also for v4 protocol compatibility because nodes cannot be looked up by ID alone. - Types Node and NodeID are gone. Further commits in the series will be fixes all over the the codebase to deal with those removals. * p2p: port to p2p/enode and discovery changes This adapts package p2p to the changes in p2p/discover. All uses of discover.Node and discover.NodeID are replaced by their equivalents from p2p/enode. New API is added to retrieve the enode.Node instance of a peer. The behavior of Server.Self with discovery disabled is improved. It now tries much harder to report a working IP address, falling back to 127.0.0.1 if no suitable address can be determined through other means. These changes were needed for tests of other packages later in the series. * p2p/simulations, p2p/testing: port to p2p/enode No surprises here, mostly replacements of discover.Node, discover.NodeID with their new equivalents. The 'interesting' API changes are: - testing.ProtocolSession tracks complete nodes, not just their IDs. - adapters.NodeConfig has a new method to create a complete node. These changes were needed to make swarm tests work. Note that the NodeID change makes the code incompatible with old simulation snapshots. * whisper/whisperv5, whisper/whisperv6: port to p2p/enode This port was easy because whisper uses []byte for node IDs and URL strings in the API. * eth: port to p2p/enode Again, easy to port because eth uses strings for node IDs and doesn't care about node information in any way. * les: port to p2p/enode Apart from replacing discover.NodeID with enode.ID, most changes are in the server pool code. It now deals with complete nodes instead of (Pubkey, IP, Port) triples. The database format is unchanged for now, but we should probably change it to use the node database later. * node: port to p2p/enode This change simply replaces discover.Node and discover.NodeID with their new equivalents. * swarm/network: port to p2p/enode Swarm has its own node address representation, BzzAddr, containing both an overlay address (the hash of a secp256k1 public key) and an underlay address (enode:// URL). There are no changes to the BzzAddr format in this commit, but certain operations such as creating a BzzAddr from a node ID are now impossible because node IDs aren't public keys anymore. Most swarm-related changes in the series remove uses of NewAddrFromNodeID, replacing it with NewAddr which takes a complete node as argument. ToOverlayAddr is removed because we can just use the node ID directly.
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var sourcePeerID = enode.HexID("99d8594b52298567d2ca3f4c441a5ba0140ee9245e26460d01102a52773c73b9")
type mockNetFetcher struct {
peers *sync.Map
all: new p2p node representation (#17643) Package p2p/enode provides a generalized representation of p2p nodes which can contain arbitrary information in key/value pairs. It is also the new home for the node database. The "v4" identity scheme is also moved here from p2p/enr to remove the dependency on Ethereum crypto from that package. Record signature handling is changed significantly. The identity scheme registry is removed and acceptable schemes must be passed to any method that needs identity. This means records must now be validated explicitly after decoding. The enode API is designed to make signature handling easy and safe: most APIs around the codebase work with enode.Node, which is a wrapper around a valid record. Going from enr.Record to enode.Node requires a valid signature. * p2p/discover: port to p2p/enode This ports the discovery code to the new node representation in p2p/enode. The wire protocol is unchanged, this can be considered a refactoring change. The Kademlia table can now deal with nodes using an arbitrary identity scheme. This requires a few incompatible API changes: - Table.Lookup is not available anymore. It used to take a public key as argument because v4 protocol requires one. Its replacement is LookupRandom. - Table.Resolve takes *enode.Node instead of NodeID. This is also for v4 protocol compatibility because nodes cannot be looked up by ID alone. - Types Node and NodeID are gone. Further commits in the series will be fixes all over the the codebase to deal with those removals. * p2p: port to p2p/enode and discovery changes This adapts package p2p to the changes in p2p/discover. All uses of discover.Node and discover.NodeID are replaced by their equivalents from p2p/enode. New API is added to retrieve the enode.Node instance of a peer. The behavior of Server.Self with discovery disabled is improved. It now tries much harder to report a working IP address, falling back to 127.0.0.1 if no suitable address can be determined through other means. These changes were needed for tests of other packages later in the series. * p2p/simulations, p2p/testing: port to p2p/enode No surprises here, mostly replacements of discover.Node, discover.NodeID with their new equivalents. The 'interesting' API changes are: - testing.ProtocolSession tracks complete nodes, not just their IDs. - adapters.NodeConfig has a new method to create a complete node. These changes were needed to make swarm tests work. Note that the NodeID change makes the code incompatible with old simulation snapshots. * whisper/whisperv5, whisper/whisperv6: port to p2p/enode This port was easy because whisper uses []byte for node IDs and URL strings in the API. * eth: port to p2p/enode Again, easy to port because eth uses strings for node IDs and doesn't care about node information in any way. * les: port to p2p/enode Apart from replacing discover.NodeID with enode.ID, most changes are in the server pool code. It now deals with complete nodes instead of (Pubkey, IP, Port) triples. The database format is unchanged for now, but we should probably change it to use the node database later. * node: port to p2p/enode This change simply replaces discover.Node and discover.NodeID with their new equivalents. * swarm/network: port to p2p/enode Swarm has its own node address representation, BzzAddr, containing both an overlay address (the hash of a secp256k1 public key) and an underlay address (enode:// URL). There are no changes to the BzzAddr format in this commit, but certain operations such as creating a BzzAddr from a node ID are now impossible because node IDs aren't public keys anymore. Most swarm-related changes in the series remove uses of NewAddrFromNodeID, replacing it with NewAddr which takes a complete node as argument. ToOverlayAddr is removed because we can just use the node ID directly.
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sources []*enode.ID
peersPerRequest [][]Address
requestCalled bool
offerCalled bool
quit <-chan struct{}
ctx context.Context
hopCounts []uint8
mu sync.Mutex
}
func (m *mockNetFetcher) Offer(source *enode.ID) {
m.offerCalled = true
m.sources = append(m.sources, source)
}
func (m *mockNetFetcher) Request(hopCount uint8) {
m.mu.Lock()
defer m.mu.Unlock()
m.requestCalled = true
var peers []Address
m.peers.Range(func(key interface{}, _ interface{}) bool {
peers = append(peers, common.FromHex(key.(string)))
return true
})
m.peersPerRequest = append(m.peersPerRequest, peers)
m.hopCounts = append(m.hopCounts, hopCount)
}
type mockNetFetchFuncFactory struct {
fetcher *mockNetFetcher
}
func (m *mockNetFetchFuncFactory) newMockNetFetcher(ctx context.Context, _ Address, peers *sync.Map) NetFetcher {
m.fetcher.peers = peers
m.fetcher.quit = ctx.Done()
m.fetcher.ctx = ctx
return m.fetcher
}
func mustNewNetStore(t *testing.T) *NetStore {
netStore, _ := mustNewNetStoreWithFetcher(t)
return netStore
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}
func mustNewNetStoreWithFetcher(t *testing.T) (*NetStore, *mockNetFetcher) {
t.Helper()
datadir, err := ioutil.TempDir("", "netstore")
if err != nil {
t.Fatal(err)
}
naddr := make([]byte, 32)
params := NewDefaultLocalStoreParams()
params.Init(datadir)
params.BaseKey = naddr
localStore, err := NewTestLocalStoreForAddr(params)
if err != nil {
t.Fatal(err)
}
fetcher := &mockNetFetcher{}
mockNetFetchFuncFactory := &mockNetFetchFuncFactory{
fetcher: fetcher,
}
netStore, err := NewNetStore(localStore, mockNetFetchFuncFactory.newMockNetFetcher)
if err != nil {
t.Fatal(err)
}
return netStore, fetcher
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}
// TestNetStoreGetAndPut tests calling NetStore.Get which is blocked until the same chunk is Put.
// After the Put there should no active fetchers, and the context created for the fetcher should
// be cancelled.
func TestNetStoreGetAndPut(t *testing.T) {
netStore, fetcher := mustNewNetStoreWithFetcher(t)
chunk := GenerateRandomChunk(ch.DefaultSize)
ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
defer cancel()
c := make(chan struct{}) // this channel ensures that the gouroutine with the Put does not run earlier than the Get
putErrC := make(chan error)
go func() {
<-c // wait for the Get to be called
time.Sleep(200 * time.Millisecond) // and a little more so it is surely called
// check if netStore created a fetcher in the Get call for the unavailable chunk
if netStore.fetchers.Len() != 1 || netStore.getFetcher(chunk.Address()) == nil {
putErrC <- errors.New("Expected netStore to use a fetcher for the Get call")
return
}
err := netStore.Put(ctx, chunk)
if err != nil {
putErrC <- fmt.Errorf("Expected no err got %v", err)
return
}
putErrC <- nil
}()
close(c)
recChunk, err := netStore.Get(ctx, chunk.Address()) // this is blocked until the Put above is done
if err != nil {
t.Fatalf("Expected no err got %v", err)
}
if err := <-putErrC; err != nil {
t.Fatal(err)
}
// the retrieved chunk should be the same as what we Put
if !bytes.Equal(recChunk.Address(), chunk.Address()) || !bytes.Equal(recChunk.Data(), chunk.Data()) {
t.Fatalf("Different chunk received than what was put")
}
// the chunk is already available locally, so there should be no active fetchers waiting for it
if netStore.fetchers.Len() != 0 {
t.Fatal("Expected netStore to remove the fetcher after delivery")
}
// A fetcher was created when the Get was called (and the chunk was not available). The chunk
// was delivered with the Put call, so the fetcher should be cancelled now.
select {
case <-fetcher.ctx.Done():
default:
t.Fatal("Expected fetcher context to be cancelled")
}
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}
// TestNetStoreGetAndPut tests calling NetStore.Put and then NetStore.Get.
// After the Put the chunk is available locally, so the Get can just retrieve it from LocalStore,
// there is no need to create fetchers.
func TestNetStoreGetAfterPut(t *testing.T) {
netStore, fetcher := mustNewNetStoreWithFetcher(t)
chunk := GenerateRandomChunk(ch.DefaultSize)
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ctx, cancel := context.WithTimeout(context.Background(), 500*time.Millisecond)
defer cancel()
// First we Put the chunk, so the chunk will be available locally
err := netStore.Put(ctx, chunk)
if err != nil {
t.Fatalf("Expected no err got %v", err)
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}
// Get should retrieve the chunk from LocalStore, without creating fetcher
recChunk, err := netStore.Get(ctx, chunk.Address())
if err != nil {
t.Fatalf("Expected no err got %v", err)
}
// the retrieved chunk should be the same as what we Put
if !bytes.Equal(recChunk.Address(), chunk.Address()) || !bytes.Equal(recChunk.Data(), chunk.Data()) {
t.Fatalf("Different chunk received than what was put")
}
// no fetcher offer or request should be created for a locally available chunk
if fetcher.offerCalled || fetcher.requestCalled {
t.Fatal("NetFetcher.offerCalled or requestCalled not expected to be called")
}
// no fetchers should be created for a locally available chunk
if netStore.fetchers.Len() != 0 {
t.Fatal("Expected netStore to not have fetcher")
}
}
// TestNetStoreGetTimeout tests a Get call for an unavailable chunk and waits for timeout
func TestNetStoreGetTimeout(t *testing.T) {
netStore, fetcher := mustNewNetStoreWithFetcher(t)
chunk := GenerateRandomChunk(ch.DefaultSize)
ctx, cancel := context.WithTimeout(context.Background(), 500*time.Millisecond)
defer cancel()
c := make(chan struct{}) // this channel ensures that the gouroutine does not run earlier than the Get
fetcherErrC := make(chan error)
go func() {
<-c // wait for the Get to be called
time.Sleep(200 * time.Millisecond) // and a little more so it is surely called
// check if netStore created a fetcher in the Get call for the unavailable chunk
if netStore.fetchers.Len() != 1 || netStore.getFetcher(chunk.Address()) == nil {
fetcherErrC <- errors.New("Expected netStore to use a fetcher for the Get call")
return
}
fetcherErrC <- nil
}()
close(c)
// We call Get on this chunk, which is not in LocalStore. We don't Put it at all, so there will
// be a timeout
_, err := netStore.Get(ctx, chunk.Address())
// Check if the timeout happened
if err != context.DeadlineExceeded {
t.Fatalf("Expected context.DeadLineExceeded err got %v", err)
}
if err := <-fetcherErrC; err != nil {
t.Fatal(err)
}
// A fetcher was created, check if it has been removed after timeout
if netStore.fetchers.Len() != 0 {
t.Fatal("Expected netStore to remove the fetcher after timeout")
}
// Check if the fetcher context has been cancelled after the timeout
select {
case <-fetcher.ctx.Done():
default:
t.Fatal("Expected fetcher context to be cancelled")
}
}
// TestNetStoreGetCancel tests a Get call for an unavailable chunk, then cancels the context and checks
// the errors
func TestNetStoreGetCancel(t *testing.T) {
netStore, fetcher := mustNewNetStoreWithFetcher(t)
chunk := GenerateRandomChunk(ch.DefaultSize)
ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
c := make(chan struct{}) // this channel ensures that the gouroutine with the cancel does not run earlier than the Get
fetcherErrC := make(chan error, 1)
go func() {
<-c // wait for the Get to be called
time.Sleep(200 * time.Millisecond) // and a little more so it is surely called
// check if netStore created a fetcher in the Get call for the unavailable chunk
if netStore.fetchers.Len() != 1 || netStore.getFetcher(chunk.Address()) == nil {
fetcherErrC <- errors.New("Expected netStore to use a fetcher for the Get call")
return
}
fetcherErrC <- nil
cancel()
}()
close(c)
// We call Get with an unavailable chunk, so it will create a fetcher and wait for delivery
_, err := netStore.Get(ctx, chunk.Address())
if err := <-fetcherErrC; err != nil {
t.Fatal(err)
}
// After the context is cancelled above Get should return with an error
if err != context.Canceled {
t.Fatalf("Expected context.Canceled err got %v", err)
}
// A fetcher was created, check if it has been removed after cancel
if netStore.fetchers.Len() != 0 {
t.Fatal("Expected netStore to remove the fetcher after cancel")
}
// Check if the fetcher context has been cancelled after the request context cancel
select {
case <-fetcher.ctx.Done():
default:
t.Fatal("Expected fetcher context to be cancelled")
}
}
// TestNetStoreMultipleGetAndPut tests four Get calls for the same unavailable chunk. The chunk is
// delivered with a Put, we have to make sure all Get calls return, and they use a single fetcher
// for the chunk retrieval
func TestNetStoreMultipleGetAndPut(t *testing.T) {
netStore, fetcher := mustNewNetStoreWithFetcher(t)
chunk := GenerateRandomChunk(ch.DefaultSize)
ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
defer cancel()
putErrC := make(chan error)
go func() {
// sleep to make sure Put is called after all the Get
time.Sleep(500 * time.Millisecond)
// check if netStore created exactly one fetcher for all Get calls
if netStore.fetchers.Len() != 1 {
putErrC <- errors.New("Expected netStore to use one fetcher for all Get calls")
return
}
err := netStore.Put(ctx, chunk)
if err != nil {
putErrC <- fmt.Errorf("Expected no err got %v", err)
return
}
putErrC <- nil
}()
count := 4
// call Get 4 times for the same unavailable chunk. The calls will be blocked until the Put above.
errC := make(chan error)
for i := 0; i < count; i++ {
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go func() {
recChunk, err := netStore.Get(ctx, chunk.Address())
if err != nil {
errC <- fmt.Errorf("Expected no err got %v", err)
}
if !bytes.Equal(recChunk.Address(), chunk.Address()) || !bytes.Equal(recChunk.Data(), chunk.Data()) {
errC <- errors.New("Different chunk received than what was put")
}
errC <- nil
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}()
}
if err := <-putErrC; err != nil {
t.Fatal(err)
}
timeout := time.After(1 * time.Second)
// The Get calls should return after Put, so no timeout expected
for i := 0; i < count; i++ {
select {
case err := <-errC:
if err != nil {
t.Fatal(err)
}
case <-timeout:
t.Fatalf("Timeout waiting for Get calls to return")
}
}
// A fetcher was created, check if it has been removed after cancel
if netStore.fetchers.Len() != 0 {
t.Fatal("Expected netStore to remove the fetcher after delivery")
}
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// A fetcher was created, check if it has been removed after delivery
select {
case <-fetcher.ctx.Done():
default:
t.Fatal("Expected fetcher context to be cancelled")
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}
}
// TestNetStoreFetchFuncTimeout tests a FetchFunc call for an unavailable chunk and waits for timeout
func TestNetStoreFetchFuncTimeout(t *testing.T) {
netStore, fetcher := mustNewNetStoreWithFetcher(t)
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chunk := GenerateRandomChunk(ch.DefaultSize)
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ctx, cancel := context.WithTimeout(context.Background(), 200*time.Millisecond)
defer cancel()
// FetchFunc is called for an unavaible chunk, so the returned wait function should not be nil
wait := netStore.FetchFunc(ctx, chunk.Address())
if wait == nil {
t.Fatal("Expected wait function to be not nil")
}
// There should an active fetcher for the chunk after the FetchFunc call
if netStore.fetchers.Len() != 1 || netStore.getFetcher(chunk.Address()) == nil {
t.Fatalf("Expected netStore to have one fetcher for the requested chunk")
}
// wait function should timeout because we don't deliver the chunk with a Put
err := wait(ctx)
if err != context.DeadlineExceeded {
t.Fatalf("Expected context.DeadLineExceeded err got %v", err)
}
// the fetcher should be removed after timeout
if netStore.fetchers.Len() != 0 {
t.Fatal("Expected netStore to remove the fetcher after timeout")
}
// the fetcher context should be cancelled after timeout
select {
case <-fetcher.ctx.Done():
default:
t.Fatal("Expected fetcher context to be cancelled")
}
}
// TestNetStoreFetchFuncAfterPut tests that the FetchFunc should return nil for a locally available chunk
func TestNetStoreFetchFuncAfterPut(t *testing.T) {
netStore := mustNewNetStore(t)
chunk := GenerateRandomChunk(ch.DefaultSize)
ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
defer cancel()
// We deliver the created the chunk with a Put
err := netStore.Put(ctx, chunk)
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if err != nil {
t.Fatalf("Expected no err got %v", err)
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}
// FetchFunc should return nil, because the chunk is available locally, no need to fetch it
wait := netStore.FetchFunc(ctx, chunk.Address())
if wait != nil {
t.Fatal("Expected wait to be nil")
}
// No fetchers should be created at all
if netStore.fetchers.Len() != 0 {
t.Fatal("Expected netStore to not have fetcher")
}
}
// TestNetStoreGetCallsRequest tests if Get created a request on the NetFetcher for an unavailable chunk
func TestNetStoreGetCallsRequest(t *testing.T) {
netStore, fetcher := mustNewNetStoreWithFetcher(t)
chunk := GenerateRandomChunk(ch.DefaultSize)
ctx := context.WithValue(context.Background(), "hopcount", uint8(5))
ctx, cancel := context.WithTimeout(ctx, 200*time.Millisecond)
defer cancel()
// We call get for a not available chunk, it will timeout because the chunk is not delivered
_, err := netStore.Get(ctx, chunk.Address())
if err != context.DeadlineExceeded {
t.Fatalf("Expected context.DeadlineExceeded err got %v", err)
}
// NetStore should call NetFetcher.Request and wait for the chunk
if !fetcher.requestCalled {
t.Fatal("Expected NetFetcher.Request to be called")
}
if fetcher.hopCounts[0] != 5 {
t.Fatalf("Expected NetFetcher.Request be called with hopCount 5, got %v", fetcher.hopCounts[0])
}
}
// TestNetStoreGetCallsOffer tests if Get created a request on the NetFetcher for an unavailable chunk
// in case of a source peer provided in the context.
func TestNetStoreGetCallsOffer(t *testing.T) {
netStore, fetcher := mustNewNetStoreWithFetcher(t)
chunk := GenerateRandomChunk(ch.DefaultSize)
// If a source peer is added to the context, NetStore will handle it as an offer
ctx := context.WithValue(context.Background(), "source", sourcePeerID.String())
ctx, cancel := context.WithTimeout(ctx, 200*time.Millisecond)
defer cancel()
// We call get for a not available chunk, it will timeout because the chunk is not delivered
_, err := netStore.Get(ctx, chunk.Address())
if err != context.DeadlineExceeded {
t.Fatalf("Expect error %v got %v", context.DeadlineExceeded, err)
}
// NetStore should call NetFetcher.Offer with the source peer
if !fetcher.offerCalled {
t.Fatal("Expected NetFetcher.Request to be called")
}
if len(fetcher.sources) != 1 {
t.Fatalf("Expected fetcher sources length 1 got %v", len(fetcher.sources))
}
if fetcher.sources[0].String() != sourcePeerID.String() {
t.Fatalf("Expected fetcher source %v got %v", sourcePeerID, fetcher.sources[0])
}
}
// TestNetStoreFetcherCountPeers tests multiple NetStore.Get calls with peer in the context.
// There is no Put call, so the Get calls timeout
func TestNetStoreFetcherCountPeers(t *testing.T) {
netStore, fetcher := mustNewNetStoreWithFetcher(t)
addr := randomAddr()
peers := []string{randomAddr().Hex(), randomAddr().Hex(), randomAddr().Hex()}
ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
defer cancel()
errC := make(chan error)
nrGets := 3
// Call Get 3 times with a peer in context
for i := 0; i < nrGets; i++ {
peer := peers[i]
go func() {
ctx := context.WithValue(ctx, "peer", peer)
_, err := netStore.Get(ctx, addr)
errC <- err
}()
}
// All 3 Get calls should timeout
for i := 0; i < nrGets; i++ {
err := <-errC
if err != context.DeadlineExceeded {
t.Fatalf("Expected \"%v\" error got \"%v\"", context.DeadlineExceeded, err)
}
}
// fetcher should be closed after timeout
select {
case <-fetcher.quit:
case <-time.After(3 * time.Second):
t.Fatalf("mockNetFetcher not closed after timeout")
}
// All 3 peers should be given to NetFetcher after the 3 Get calls
if len(fetcher.peersPerRequest) != nrGets {
t.Fatalf("Expected 3 got %v", len(fetcher.peersPerRequest))
}
for i, peers := range fetcher.peersPerRequest {
if len(peers) < i+1 {
t.Fatalf("Expected at least %v got %v", i+1, len(peers))
}
}
}
// TestNetStoreFetchFuncCalledMultipleTimes calls the wait function given by FetchFunc three times,
// and checks there is still exactly one fetcher for one chunk. Afthe chunk is delivered, it checks
// if the fetcher is closed.
func TestNetStoreFetchFuncCalledMultipleTimes(t *testing.T) {
netStore, fetcher := mustNewNetStoreWithFetcher(t)
chunk := GenerateRandomChunk(ch.DefaultSize)
ctx, cancel := context.WithTimeout(context.Background(), 500*time.Millisecond)
defer cancel()
// FetchFunc should return a non-nil wait function, because the chunk is not available
wait := netStore.FetchFunc(ctx, chunk.Address())
if wait == nil {
t.Fatal("Expected wait function to be not nil")
}
// There should be exactly one fetcher for the chunk
if netStore.fetchers.Len() != 1 || netStore.getFetcher(chunk.Address()) == nil {
t.Fatalf("Expected netStore to have one fetcher for the requested chunk")
}
// Call wait three times in parallel
count := 3
errC := make(chan error)
for i := 0; i < count; i++ {
go func() {
errC <- wait(ctx)
}()
}
// sleep a little so the wait functions are called above
time.Sleep(100 * time.Millisecond)
// there should be still only one fetcher, because all wait calls are for the same chunk
if netStore.fetchers.Len() != 1 || netStore.getFetcher(chunk.Address()) == nil {
t.Fatal("Expected netStore to have one fetcher for the requested chunk")
}
// Deliver the chunk with a Put
err := netStore.Put(ctx, chunk)
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if err != nil {
t.Fatalf("Expected no err got %v", err)
}
// wait until all wait calls return (because the chunk is delivered)
for i := 0; i < count; i++ {
err := <-errC
if err != nil {
t.Fatal(err)
}
}
// There should be no more fetchers for the delivered chunk
if netStore.fetchers.Len() != 0 {
t.Fatal("Expected netStore to remove the fetcher after delivery")
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}
// The context for the fetcher should be cancelled after delivery
select {
case <-fetcher.ctx.Done():
default:
t.Fatal("Expected fetcher context to be cancelled")
}
}
// TestNetStoreFetcherLifeCycleWithTimeout is similar to TestNetStoreFetchFuncCalledMultipleTimes,
// the only difference is that we don't deilver the chunk, just wait for timeout
func TestNetStoreFetcherLifeCycleWithTimeout(t *testing.T) {
netStore, fetcher := mustNewNetStoreWithFetcher(t)
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chunk := GenerateRandomChunk(ch.DefaultSize)
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ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
defer cancel()
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// FetchFunc should return a non-nil wait function, because the chunk is not available
wait := netStore.FetchFunc(ctx, chunk.Address())
if wait == nil {
t.Fatal("Expected wait function to be not nil")
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}
// There should be exactly one fetcher for the chunk
if netStore.fetchers.Len() != 1 || netStore.getFetcher(chunk.Address()) == nil {
t.Fatalf("Expected netStore to have one fetcher for the requested chunk")
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}
// Call wait three times in parallel
count := 3
errC := make(chan error)
for i := 0; i < count; i++ {
go func() {
rctx, rcancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
defer rcancel()
err := wait(rctx)
if err != context.DeadlineExceeded {
errC <- fmt.Errorf("Expected err %v got %v", context.DeadlineExceeded, err)
return
}
errC <- nil
}()
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}
// wait until all wait calls timeout
for i := 0; i < count; i++ {
err := <-errC
if err != nil {
t.Fatal(err)
}
}
// There should be no more fetchers after timeout
if netStore.fetchers.Len() != 0 {
t.Fatal("Expected netStore to remove the fetcher after delivery")
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}
// The context for the fetcher should be cancelled after timeout
select {
case <-fetcher.ctx.Done():
default:
t.Fatal("Expected fetcher context to be cancelled")
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}
}
func randomAddr() Address {
addr := make([]byte, 32)
rand.Read(addr)
return Address(addr)
}