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package praefect
import (
"context"
"errors"
"fmt"
"math/rand"
"sync"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"gitlab.com/gitlab-org/gitaly/v14/internal/praefect/config"
"gitlab.com/gitlab-org/gitaly/v14/internal/praefect/datastore"
"gitlab.com/gitlab-org/gitaly/v14/internal/praefect/nodes"
"gitlab.com/gitlab-org/gitaly/v14/internal/praefect/protoregistry"
"gitlab.com/gitlab-org/gitaly/v14/internal/praefect/transactions"
"gitlab.com/gitlab-org/gitaly/v14/internal/testhelper"
"gitlab.com/gitlab-org/gitaly/v14/internal/testhelper/testdb"
"gitlab.com/gitlab-org/gitaly/v14/internal/transaction/txinfo"
"gitlab.com/gitlab-org/gitaly/v14/internal/transaction/voting"
"gitlab.com/gitlab-org/gitaly/v14/proto/go/gitalypb"
"google.golang.org/grpc/peer"
"google.golang.org/protobuf/proto"
)
func TestStreamDirectorMutator_Transaction(t *testing.T) {
t.Parallel()
type subtransactions []struct {
vote string
shouldSucceed bool
}
type node struct {
subtransactions subtransactions
shouldGetRepl bool
shouldParticipate bool
generation int
expectedGeneration int
}
testcases := []struct {
desc string
primaryFails bool
concurrentWrite bool
nodes []node
expectedRequestFinalizerErrorMessage string
}{
{
desc: "successful vote should not create replication jobs",
nodes: []node{
{subtransactions: subtransactions{{vote: "foobar", shouldSucceed: true}}, shouldGetRepl: false, shouldParticipate: true, expectedGeneration: 1},
{subtransactions: subtransactions{{vote: "foobar", shouldSucceed: true}}, shouldGetRepl: false, shouldParticipate: true, expectedGeneration: 1},
{subtransactions: subtransactions{{vote: "foobar", shouldSucceed: true}}, shouldGetRepl: false, shouldParticipate: true, expectedGeneration: 1},
},
},
{
desc: "successful vote should create replication jobs if the primary fails",
primaryFails: true,
nodes: []node{
{subtransactions: subtransactions{{vote: "foobar", shouldSucceed: true}}, shouldGetRepl: false, shouldParticipate: true, expectedGeneration: 1},
{subtransactions: subtransactions{{vote: "foobar", shouldSucceed: true}}, shouldGetRepl: true, shouldParticipate: true, expectedGeneration: 0},
{subtransactions: subtransactions{{vote: "foobar", shouldSucceed: true}}, shouldGetRepl: true, shouldParticipate: true, expectedGeneration: 0},
},
},
{
desc: "failing vote should create replication jobs without committed subtransactions",
nodes: []node{
{subtransactions: subtransactions{{vote: "foo", shouldSucceed: false}}, shouldGetRepl: false, shouldParticipate: true, expectedGeneration: 1},
{subtransactions: subtransactions{{vote: "qux", shouldSucceed: false}}, shouldGetRepl: true, shouldParticipate: true, expectedGeneration: 0},
{subtransactions: subtransactions{{vote: "bar", shouldSucceed: false}}, shouldGetRepl: true, shouldParticipate: true, expectedGeneration: 0},
},
},
{
desc: "failing vote should create replication jobs with committed subtransaction",
nodes: []node{
{subtransactions: subtransactions{{vote: "foo", shouldSucceed: true}, {vote: "foo", shouldSucceed: false}}, shouldGetRepl: false, shouldParticipate: true, expectedGeneration: 1},
{subtransactions: subtransactions{{vote: "foo", shouldSucceed: true}, {vote: "qux", shouldSucceed: false}}, shouldGetRepl: true, shouldParticipate: true, expectedGeneration: 0},
{subtransactions: subtransactions{{vote: "foo", shouldSucceed: true}, {vote: "bar", shouldSucceed: false}}, shouldGetRepl: true, shouldParticipate: true, expectedGeneration: 0},
},
},
{
desc: "primary should reach quorum with disagreeing secondary",
nodes: []node{
{subtransactions: subtransactions{{vote: "foobar", shouldSucceed: true}}, shouldGetRepl: false, shouldParticipate: true, expectedGeneration: 1},
{subtransactions: subtransactions{{vote: "barfoo", shouldSucceed: false}}, shouldGetRepl: true, shouldParticipate: true, expectedGeneration: 0},
},
},
{
desc: "quorum should create replication jobs for disagreeing node",
nodes: []node{
{subtransactions: subtransactions{{vote: "foobar", shouldSucceed: true}}, shouldGetRepl: false, shouldParticipate: true, expectedGeneration: 1},
{subtransactions: subtransactions{{vote: "foobar", shouldSucceed: true}}, shouldGetRepl: false, shouldParticipate: true, expectedGeneration: 1},
{subtransactions: subtransactions{{vote: "barfoo", shouldSucceed: false}}, shouldGetRepl: true, shouldParticipate: true, expectedGeneration: 0},
},
},
{
desc: "only consistent secondaries should participate",
nodes: []node{
{subtransactions: subtransactions{{vote: "foobar", shouldSucceed: true}}, shouldParticipate: true, generation: 1, expectedGeneration: 2},
{subtransactions: subtransactions{{vote: "foobar", shouldSucceed: true}}, shouldParticipate: true, generation: 1, expectedGeneration: 2},
{shouldParticipate: false, shouldGetRepl: true, generation: 0, expectedGeneration: 0},
{shouldParticipate: false, shouldGetRepl: true, generation: datastore.GenerationUnknown, expectedGeneration: datastore.GenerationUnknown},
},
},
{
desc: "write is not acknowledged if it only targets outdated nodes",
concurrentWrite: true,
nodes: []node{
{subtransactions: subtransactions{{vote: "foobar", shouldSucceed: true}}, shouldParticipate: true, generation: 0, expectedGeneration: 0},
{shouldParticipate: false, shouldGetRepl: false, generation: 0, expectedGeneration: 0},
},
expectedRequestFinalizerErrorMessage: "increment generation: write to outdated nodes",
},
{
// All transactional RPCs are expected to cast vote if they are successful. If they don't, something is wrong
// and we should replicate to the secondaries to be sure.
desc: "unstarted transaction creates replication jobs if the primary is successful",
nodes: []node{
{shouldGetRepl: false, expectedGeneration: 1},
{shouldGetRepl: true, expectedGeneration: 0},
},
},
{
desc: "unstarted transaction does not create replication job",
primaryFails: true,
nodes: []node{
{expectedGeneration: 0},
{shouldGetRepl: false, expectedGeneration: 0},
},
},
{
desc: "unstarted transaction should not create replication jobs for outdated node if the primary does not vote",
primaryFails: true,
nodes: []node{
{shouldGetRepl: false, generation: 1, expectedGeneration: 1},
{shouldGetRepl: false, generation: 1, expectedGeneration: 1},
{shouldGetRepl: false, generation: 0, expectedGeneration: 0},
{shouldGetRepl: false, generation: datastore.GenerationUnknown, expectedGeneration: datastore.GenerationUnknown},
},
},
{
// If there were no subtransactions and the primary did not fail, we should schedule replication jobs to every secondary.
// All transactional RPCs are expected to vote if they are successful.
desc: "unstarted transaction should create replication jobs for outdated node if the primary succeeds",
nodes: []node{
{shouldGetRepl: false, generation: 1, expectedGeneration: 2},
{shouldGetRepl: true, generation: 1, expectedGeneration: 1},
{shouldGetRepl: true, generation: 0, expectedGeneration: 0},
{shouldGetRepl: true, generation: datastore.GenerationUnknown, expectedGeneration: datastore.GenerationUnknown},
},
},
}
db := testdb.New(t)
for _, tc := range testcases {
t.Run(tc.desc, func(t *testing.T) {
db.TruncateAll(t)
storageNodes := make([]*config.Node, 0, len(tc.nodes))
for i := range tc.nodes {
socket := testhelper.GetTemporaryGitalySocketFileName(t)
node := &config.Node{Address: "unix://" + socket, Storage: fmt.Sprintf("node-%d", i)}
storageNodes = append(storageNodes, node)
}
conf := config.Config{
VirtualStorages: []*config.VirtualStorage{
{
Name: "praefect",
Nodes: storageNodes,
},
},
}
var replicationWaitGroup sync.WaitGroup
queueInterceptor := datastore.NewReplicationEventQueueInterceptor(datastore.NewPostgresReplicationEventQueue(db))
queueInterceptor.OnEnqueue(func(ctx context.Context, event datastore.ReplicationEvent, queue datastore.ReplicationEventQueue) (datastore.ReplicationEvent, error) {
defer replicationWaitGroup.Done()
return queue.Enqueue(ctx, event)
})
virtualStorage := conf.VirtualStorages[0].Name
repo := gitalypb.Repository{
StorageName: virtualStorage,
RelativePath: "/path/to/hashed/repository",
}
ctx := testhelper.Context(t)
txMgr := transactions.NewManager(conf)
tx := db.Begin(t)
defer tx.Rollback(t)
// set up the generations prior to transaction
rs := datastore.NewPostgresRepositoryStore(tx, conf.StorageNames())
repoCreated := false
for i, n := range tc.nodes {
if n.generation == datastore.GenerationUnknown {
continue
}
if !repoCreated {
repoCreated = true
require.NoError(t, rs.CreateRepository(ctx, 1, repo.StorageName, repo.RelativePath, repo.RelativePath, storageNodes[i].Storage, nil, nil, true, false))
}
require.NoError(t, rs.SetGeneration(ctx, 1, storageNodes[i].Storage, repo.RelativePath, n.generation))
}
testdb.SetHealthyNodes(t, ctx, tx, map[string]map[string][]string{"praefect": conf.StorageNames()})
nodeSet, err := DialNodes(
ctx,
conf.VirtualStorages,
protoregistry.GitalyProtoPreregistered,
nil,
nil,
nil,
)
require.NoError(t, err)
defer nodeSet.Close()
coordinator := NewCoordinator(
queueInterceptor,
rs,
NewPerRepositoryRouter(
nodeSet.Connections(),
nodes.NewPerRepositoryElector(tx),
StaticHealthChecker(conf.StorageNames()),
NewLockedRandom(rand.New(rand.NewSource(0))),
rs,
datastore.NewAssignmentStore(tx, conf.StorageNames()),
rs,
nil,
),
txMgr,
conf,
protoregistry.GitalyProtoPreregistered,
)
fullMethod := "/gitaly.SmartHTTPService/PostReceivePack"
frame, err := proto.Marshal(&gitalypb.PostReceivePackRequest{
Repository: &repo,
})
require.NoError(t, err)
peeker := &mockPeeker{frame}
streamParams, err := coordinator.StreamDirector(ctx, fullMethod, peeker)
require.NoError(t, err)
txCtx := peer.NewContext(streamParams.Primary().Ctx, &peer.Peer{})
transaction, err := txinfo.TransactionFromContext(txCtx)
require.NoError(t, err)
var voterWaitGroup sync.WaitGroup
for i, node := range tc.nodes {
if node.shouldGetRepl {
replicationWaitGroup.Add(1)
}
if !node.shouldParticipate {
continue
}
i := i
node := node
voterWaitGroup.Add(1)
go func() {
defer voterWaitGroup.Done()
for _, subtransaction := range node.subtransactions {
vote := voting.VoteFromData([]byte(subtransaction.vote))
err := txMgr.VoteTransaction(ctx, transaction.ID, fmt.Sprintf("node-%d", i), vote)
if subtransaction.shouldSucceed {
if !assert.NoError(t, err) {
break
}
} else {
if !assert.True(t, errors.Is(err, transactions.ErrTransactionFailed)) {
break
}
}
}
}()
}
voterWaitGroup.Wait()
if tc.primaryFails {
require.Error(t, streamParams.Primary().ErrHandler(errors.New("rpc failure")))
}
if tc.concurrentWrite {
require.NoError(t, rs.SetGeneration(ctx, 1, "non-participating-storage", repo.RelativePath, 2))
}
err = streamParams.RequestFinalizer()
if tc.expectedRequestFinalizerErrorMessage != "" {
require.EqualError(t, err, tc.expectedRequestFinalizerErrorMessage)
} else {
require.NoError(t, err)
}
// Nodes that successfully committed should have their generations incremented.
// Nodes that did not successfully commit or did not participate should remain on their
// existing generation.
for i, n := range tc.nodes {
gen, err := rs.GetGeneration(ctx, 1, storageNodes[i].Storage)
require.NoError(t, err)
require.Equal(t, n.expectedGeneration, gen, "node %d has wrong generation", i)
}
tx.Commit(t)
replicationWaitGroup.Wait()
for i, node := range tc.nodes {
events, err := queueInterceptor.Dequeue(ctx, "praefect", fmt.Sprintf("node-%d", i), 10)
require.NoError(t, err)
if node.shouldGetRepl {
require.Len(t, events, 1)
} else {
require.Empty(t, events)
}
}
})
}
}
|