services/syncbase/vsync/initiator_test.go - release.go.x.ref - Git at Google

 // Copyright 2015 The Vanadium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.

 // The initiator tests below are driven by replaying the state from the log
 // files (in testdata directory). These log files may mimic watching the
 // Database locally (addl commands in the log file) or obtaining log records and
 // generation vector from a remote peer (addr, genvec commands). The log files
 // contain the metadata of log records. The log files are only used to set up
 // the state. The tests verify that given a particular local state and a stream
 // of remote deltas, the initiator behaves as expected.

 package vsync

 import (
 	"fmt"
 	"reflect"
 	"sort"
 	"testing"
 	"time"

 	wire "v.io/v23/services/syncbase/nosql"
 	"v.io/v23/vom"
 	"v.io/x/lib/set"
 	_ "v.io/x/ref/runtime/factories/generic"
 	"v.io/x/ref/services/syncbase/server/interfaces"
 	"v.io/x/ref/services/syncbase/server/util"
 	"v.io/x/ref/services/syncbase/server/watchable"
 )

 // TestLogStreamRemoteOnly tests processing of a remote log stream. Commands are
 // in file testdata/remote-init-00.log.sync.
 func TestLogStreamRemoteOnly(t *testing.T) {
 	svc, iSt, cleanup := testInit(t, "", "remote-init-00.log.sync", false)
 	defer cleanup()

 	// Check all log records.
 	objid := util.JoinKeyParts(util.RowPrefix, "tb", "foo1")
 	var gen uint64
 	var parents []string
 	for gen = 1; gen < 4; gen++ {
 		gotRec, err := getLogRec(nil, svc.St(), logDataPrefix, 11, gen)
 		if err != nil || gotRec == nil {
 			t.Fatalf("getLogRec can not find object %s 11 %d, err %v", logDataPrefix, gen, err)
 		}
 		vers := fmt.Sprintf("%d", gen)
 		wantRec := &LocalLogRec{
 			Metadata: interfaces.LogRecMetadata{
 				Id:         11,
 				Gen:        gen,
 				RecType:    interfaces.NodeRec,
 				ObjId:      objid,
 				CurVers:    vers,
 				Parents:    parents,
 				UpdTime:    constTime,
 				BatchCount: 1,
 			},
 			Pos: gen - 1,
 		}

 		if !reflect.DeepEqual(gotRec, wantRec) {
 			t.Fatalf("Data mismatch in log record got %v, want %v", gotRec, wantRec)
 		}
 		// Verify DAG state.
 		if _, err := getNode(nil, svc.St(), objid, vers); err != nil {
 			t.Fatalf("getNode can not find object %s vers %s in DAG, err %v", objid, vers, err)
 		}
 		// Verify Database state.
 		tx := svc.St().NewTransaction()
 		if _, err := watchable.GetAtVersion(nil, tx, []byte(objid), nil, []byte(vers)); err != nil {
 			t.Fatalf("GetAtVersion can not find object %s vers %s in Database, err %v", objid, vers, err)
 		}
 		tx.Abort()
 		parents = []string{vers}
 	}

 	// Verify conflict state.
 	if len(iSt.updObjects) != 1 {
 		t.Fatalf("Unexpected number of updated objects %d", len(iSt.updObjects))
 	}
 	st := iSt.updObjects[objid]
 	if st.isConflict {
 		t.Fatalf("Detected a conflict %v", st)
 	}
 	if st.newHead != "3" || st.oldHead != NoVersion {
 		t.Fatalf("Conflict detection didn't succeed %v", st)
 	}

 	// Verify genvec state.
 	wantVecs := interfaces.Knowledge{
 		"tb\xfefoo1": interfaces.GenVector{11: 3},
 		"tb\xfebar":  interfaces.GenVector{11: 0},
 	}
 	if !reflect.DeepEqual(iSt.updLocal, wantVecs) {
 		t.Fatalf("Final local gen vec mismatch got %v, want %v", iSt.updLocal, wantVecs)
 	}

 	// Verify DAG state.
 	if head, err := getHead(nil, svc.St(), objid); err != nil || head != "3" {
 		t.Fatalf("Invalid object %s head in DAG %v, err %v", objid, head, err)
 	}

 	// Verify Database state.
 	valbuf, err := svc.St().Get([]byte(objid), nil)
 	var val string
 	if err := vom.Decode(valbuf, &val); err != nil {
 		t.Fatalf("Value decode failed, err %v", err)
 	}
 	if err != nil || val != "abc" {
 		t.Fatalf("Invalid object %s in Database %v, err %v", objid, val, err)
 	}
 	tx := svc.St().NewTransaction()
 	version, err := watchable.GetVersion(nil, tx, []byte(objid))
 	if err != nil || string(version) != "3" {
 		t.Fatalf("Invalid object %s head in Database %v, err %v", objid, string(version), err)
 	}
 	tx.Abort()
 }

 // TestLogStreamNoConflict tests that a local and a remote log stream can be
 // correctly applied (when there are no conflicts). Commands are in files
 // testdata/<local-init-00.log.sync,remote-noconf-00.log.sync>.
 func TestLogStreamNoConflict(t *testing.T) {
 	svc, iSt, cleanup := testInit(t, "local-init-00.log.sync", "remote-noconf-00.log.sync", false)
 	defer cleanup()

 	objid := util.JoinKeyParts(util.RowPrefix, "tb\xfefoo1")

 	// Check all log records.
 	var version uint64 = 1
 	var parents []string
 	for _, devid := range []uint64{10, 11} {
 		var gen uint64
 		for gen = 1; gen < 4; gen++ {
 			gotRec, err := getLogRec(nil, svc.St(), logDataPrefix, devid, gen)
 			if err != nil || gotRec == nil {
 				t.Fatalf("getLogRec can not find object %s:%d:%d, err %v",
 					logDataPrefix, devid, gen, err)
 			}
 			vers := fmt.Sprintf("%d", version)
 			wantRec := &LocalLogRec{
 				Metadata: interfaces.LogRecMetadata{
 					Id:         devid,
 					Gen:        gen,
 					RecType:    interfaces.NodeRec,
 					ObjId:      objid,
 					CurVers:    vers,
 					Parents:    parents,
 					UpdTime:    constTime,
 					BatchCount: 1,
 				},
 				Pos: gen - 1,
 			}

 			if !reflect.DeepEqual(gotRec, wantRec) {
 				t.Fatalf("Data mismatch in log record got %v, want %v", gotRec, wantRec)
 			}

 			// Verify DAG state.
 			if _, err := getNode(nil, svc.St(), objid, vers); err != nil {
 				t.Fatalf("getNode can not find object %s vers %s in DAG, err %v", objid, vers, err)
 			}
 			// Verify Database state.
 			tx := svc.St().NewTransaction()
 			if _, err := watchable.GetAtVersion(nil, tx, []byte(objid), nil, []byte(vers)); err != nil {
 				t.Fatalf("GetAtVersion can not find object %s vers %s in Database, err %v", objid, vers, err)
 			}
 			tx.Abort()
 			parents = []string{vers}
 			version++
 		}
 	}

 	// Verify conflict state.
 	if len(iSt.updObjects) != 1 {
 		t.Fatalf("Unexpected number of updated objects %d", len(iSt.updObjects))
 	}
 	st := iSt.updObjects[objid]
 	if st.isConflict {
 		t.Fatalf("Detected a conflict %v", st)
 	}
 	if st.newHead != "6" || st.oldHead != "3" {
 		t.Fatalf("Conflict detection didn't succeed %v", st)
 	}

 	// Verify genvec state.
 	wantVecs := interfaces.Knowledge{
 		"tb\xfefoo1": interfaces.GenVector{11: 3},
 		"tb\xfebar":  interfaces.GenVector{11: 0},
 	}
 	if !reflect.DeepEqual(iSt.updLocal, wantVecs) {
 		t.Fatalf("Final local gen vec failed got %v, want %v", iSt.updLocal, wantVecs)
 	}

 	// Verify DAG state.
 	if head, err := getHead(nil, svc.St(), objid); err != nil || head != "6" {
 		t.Fatalf("Invalid object %s head in DAG %v, err %v", objid, head, err)
 	}

 	// Verify Database state.
 	valbuf, err := svc.St().Get([]byte(objid), nil)
 	var val string
 	if err := vom.Decode(valbuf, &val); err != nil {
 		t.Fatalf("Value decode failed, err %v", err)
 	}
 	if err != nil || val != "abc" {
 		t.Fatalf("Invalid object %s in Database %v, err %v", objid, val, err)
 	}
 	tx := svc.St().NewTransaction()
 	versbuf, err := watchable.GetVersion(nil, tx, []byte(objid))
 	if err != nil || string(versbuf) != "6" {
 		t.Fatalf("Invalid object %s head in Database %v, err %v", objid, string(versbuf), err)
 	}
 	tx.Abort()
 }

 // TestLogStreamConflict tests that a local and a remote log stream can be
 // correctly applied when there are conflicts. Commands are in files
 // testdata/<local-init-00.log.sync,remote-conf-00.log.sync>.
 func TestLogStreamConflict(t *testing.T) {
 	svc, iSt, cleanup := testInit(t, "local-init-00.log.sync", "remote-conf-00.log.sync", false)
 	defer cleanup()

 	objid := util.JoinKeyParts(util.RowPrefix, "tb\xfefoo1")

 	// Verify conflict state.
 	if len(iSt.updObjects) != 1 {
 		t.Fatalf("Unexpected number of updated objects %d", len(iSt.updObjects))
 	}
 	st := iSt.updObjects[objid]
 	if !st.isConflict {
 		t.Fatalf("Didn't detect a conflict %v", st)
 	}
 	if st.newHead != "6" || st.oldHead != "3" || st.ancestor != "2" {
 		t.Fatalf("Conflict detection didn't succeed %v", st)
 	}
 	if st.res.ty != pickRemote {
 		t.Fatalf("Conflict resolution did not pick remote: %v", st.res.ty)
 	}

 	// Verify DAG state.
 	if head, err := getHead(nil, svc.St(), objid); err != nil || head != "6" {
 		t.Fatalf("Invalid object %s head in DAG %v, err %v", objid, head, err)
 	}

 	// Verify Database state.
 	valbuf, err := svc.St().Get([]byte(objid), nil)
 	var val string
 	if err := vom.Decode(valbuf, &val); err != nil {
 		t.Fatalf("Value decode failed, err %v", err)
 	}
 	if err != nil || val != "abc" {
 		t.Fatalf("Invalid object %s in Database %v, err %v", objid, string(valbuf), err)
 	}
 	tx := svc.St().NewTransaction()
 	versbuf, err := watchable.GetVersion(nil, tx, []byte(objid))
 	if err != nil || string(versbuf) != "6" {
 		t.Fatalf("Invalid object %s head in Database %v, err %v", objid, string(versbuf), err)
 	}
 	tx.Abort()
 }

 // TestLogStreamConflictNoAncestor tests that a local and a remote log stream
 // can be correctly applied when there are conflicts from the start where the
 // two versions of an object have no common ancestor. Commands are in files
 // testdata/<local-init-00.log.sync,remote-conf-03.log.sync>.
 func TestLogStreamConflictNoAncestor(t *testing.T) {
 	svc, iSt, cleanup := testInit(t, "local-init-00.log.sync", "remote-conf-03.log.sync", false)
 	defer cleanup()

 	objid := util.JoinKeyParts(util.RowPrefix, "tb\xfefoo1")

 	// Verify conflict state.
 	if len(iSt.updObjects) != 1 {
 		t.Fatalf("Unexpected number of updated objects %d", len(iSt.updObjects))
 	}
 	st := iSt.updObjects[objid]
 	if !st.isConflict {
 		t.Fatalf("Didn't detect a conflict %v", st)
 	}
 	if st.newHead != "6" || st.oldHead != "3" || st.ancestor != "" {
 		t.Fatalf("Conflict detection didn't succeed %v", st)
 	}
 	if st.res.ty != pickRemote {
 		t.Fatalf("Conflict resolution did not pick remote: %v", st.res.ty)
 	}

 	// Verify DAG state.
 	if head, err := getHead(nil, svc.St(), objid); err != nil || head != "6" {
 		t.Fatalf("Invalid object %s head in DAG %v, err %v", objid, head, err)
 	}

 	// Verify Database state.
 	valbuf, err := svc.St().Get([]byte(objid), nil)
 	var val string
 	if err := vom.Decode(valbuf, &val); err != nil {
 		t.Fatalf("Value decode failed, err %v", err)
 	}
 	if err != nil || val != "abc" {
 		t.Fatalf("Invalid object %s in Database %v, err %v", objid, string(valbuf), err)
 	}
 	tx := svc.St().NewTransaction()
 	versbuf, err := watchable.GetVersion(nil, tx, []byte(objid))
 	if err != nil || string(versbuf) != "6" {
 		t.Fatalf("Invalid object %s head in Database %v, err %v", objid, string(versbuf), err)
 	}
 	tx.Abort()
 }

 //////////////////////////////
 // Helpers.

 func testInit(t *testing.T, lfile, rfile string, sg bool) (*mockService, *initiationState, func()) {
 	// Set a large value to prevent the initiator from running.
 	peerSyncInterval = 1 * time.Hour
 	svc := createService(t)
 	cleanup := func() {
 		destroyService(t, svc)
 	}

 	// If there's an error during testInit, we bail out and should clean up after
 	// ourselves.
 	var err error
 	defer func() {
 		if err != nil {
 			cleanup()
 		}
 	}()

 	s := svc.sync
 	s.id = 10 // initiator

 	sgId1 := interfaces.GroupId(1234)
 	gdb := appDbName("mockapp", "mockdb")
 	nullInfo := wire.SyncgroupMemberInfo{}
 	sgInfo := sgMemberInfo{
 		sgId1: nullInfo,
 	}
 	info := &memberInfo{
 		db2sg: map[string]sgMemberInfo{
 			gdb: sgInfo,
 		},
 		mtTables: map[string]struct{}{
 			"1/2/3/4": struct{}{},
 			"5/6/7/8": struct{}{},
 		},
 	}

 	sg1 := &interfaces.Syncgroup{
 		Name:        "sg1",
 		Id:          sgId1,
 		AppName:     "mockapp",
 		DbName:      "mockdb",
 		Creator:     "mockCreator",
 		SpecVersion: "etag-0",
 		Spec: wire.SyncgroupSpec{
 			Prefixes:    []wire.TableRow{{TableName: "foo", Row: ""}, {TableName: "bar", Row: ""}},
 			MountTables: []string{"1/2/3/4", "5/6/7/8"},
 		},
 		Joiners: map[string]wire.SyncgroupMemberInfo{
 			"a": nullInfo,
 			"b": nullInfo,
 		},
 	}

 	tx := svc.St().NewTransaction()
 	if err = s.addSyncgroup(nil, tx, NoVersion, true, "", nil, s.id, 1, 1, sg1); err != nil {
 		t.Fatalf("cannot add syncgroup ID %d, err %v", sg1.Id, err)
 	}
 	if err = tx.Commit(); err != nil {
 		t.Fatalf("cannot commit adding syncgroup ID %d, err %v", sg1.Id, err)
 	}

 	if lfile != "" {
 		replayLocalCommands(t, svc, lfile)
 	}

 	if rfile == "" {
 		return svc, nil, cleanup
 	}

 	var c *initiationConfig
 	if c, err = newInitiationConfig(nil, s, gdb, info.db2sg[gdb], connInfo{relName: "b", mtTbls: set.String.ToSlice(info.mtTables)}); err != nil {
 		t.Fatalf("newInitiationConfig failed with err %v", err)
 	}

 	iSt := newInitiationState(nil, c, sg)

 	sgs := make(sgSet)
 	sgs[sgId1] = struct{}{}
 	iSt.config.sgPfxs = map[string]sgSet{
 		toTableRowPrefixStr(sg1.Spec.Prefixes[0]): sgs,
 		toTableRowPrefixStr(sg1.Spec.Prefixes[1]): sgs,
 	}

 	sort.Strings(iSt.config.peer.mtTbls)
 	sort.Strings(sg1.Spec.MountTables)

 	if !reflect.DeepEqual(iSt.config.peer.mtTbls, sg1.Spec.MountTables) {
 		// Set err so that the deferred cleanup func runs.
 		err = fmt.Errorf("Mount tables are not equal: config %v, spec %v", iSt.config.peer.mtTbls, sg1.Spec.MountTables)
 		t.Fatal(err)
 	}

 	s.initSyncStateInMem(nil, "mockapp", "mockdb", sgOID(sgId1))

 	iSt.stream = createReplayStream(t, rfile)

 	var wantVecs interfaces.Knowledge
 	if sg {
 		if err = iSt.prepareSGDeltaReq(nil); err != nil {
 			t.Fatalf("prepareSGDeltaReq failed with err %v", err)
 		}
 		sg := fmt.Sprintf("%d", sgId1)
 		wantVecs = interfaces.Knowledge{
 			sg: interfaces.GenVector{10: 0},
 		}
 	} else {
 		if err = iSt.prepareDataDeltaReq(nil); err != nil {
 			t.Fatalf("prepareDataDeltaReq failed with err %v", err)
 		}

 		wantVecs = interfaces.Knowledge{
 			"foo\xfe": interfaces.GenVector{10: 0},
 			"bar\xfe": interfaces.GenVector{10: 0},
 		}
 	}

 	if !reflect.DeepEqual(iSt.local, wantVecs) {
 		// Set err so that the deferred cleanup func runs.
 		err = fmt.Errorf("createLocalGenVec failed: got %v, want %v", iSt.local, wantVecs)
 		t.Fatal(err)
 	}

 	if err = iSt.recvAndProcessDeltas(nil); err != nil {
 		t.Fatalf("recvAndProcessDeltas failed with err %v", err)
 	}

 	if err = iSt.processUpdatedObjects(nil); err != nil {
 		t.Fatalf("processUpdatedObjects failed with err %v", err)
 	}
 	return svc, iSt, cleanup
 }
	// Copyright 2015 The Vanadium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style
	// license that can be found in the LICENSE file.

	// The initiator tests below are driven by replaying the state from the log
	// files (in testdata directory). These log files may mimic watching the
	// Database locally (addl commands in the log file) or obtaining log records and
	// generation vector from a remote peer (addr, genvec commands). The log files
	// contain the metadata of log records. The log files are only used to set up
	// the state. The tests verify that given a particular local state and a stream
	// of remote deltas, the initiator behaves as expected.

	package vsync

	import (
	"fmt"
	"reflect"
	"sort"
	"testing"
	"time"

	wire "v.io/v23/services/syncbase/nosql"
	"v.io/v23/vom"
	"v.io/x/lib/set"
	_ "v.io/x/ref/runtime/factories/generic"
	"v.io/x/ref/services/syncbase/server/interfaces"
	"v.io/x/ref/services/syncbase/server/util"
	"v.io/x/ref/services/syncbase/server/watchable"
	)

	// TestLogStreamRemoteOnly tests processing of a remote log stream. Commands are
	// in file testdata/remote-init-00.log.sync.
	func TestLogStreamRemoteOnly(t *testing.T) {
	svc, iSt, cleanup := testInit(t, "", "remote-init-00.log.sync", false)
	defer cleanup()

	// Check all log records.
	objid := util.JoinKeyParts(util.RowPrefix, "tb", "foo1")
	var gen uint64
	var parents []string
	for gen = 1; gen < 4; gen++ {
	gotRec, err := getLogRec(nil, svc.St(), logDataPrefix, 11, gen)
	if err != nil \|\| gotRec == nil {
	t.Fatalf("getLogRec can not find object %s 11 %d, err %v", logDataPrefix, gen, err)
	}
	vers := fmt.Sprintf("%d", gen)
	wantRec := &LocalLogRec{
	Metadata: interfaces.LogRecMetadata{
	Id: 11,
	Gen: gen,
	RecType: interfaces.NodeRec,
	ObjId: objid,
	CurVers: vers,
	Parents: parents,
	UpdTime: constTime,
	BatchCount: 1,
	},
	Pos: gen - 1,
	}

	if !reflect.DeepEqual(gotRec, wantRec) {
	t.Fatalf("Data mismatch in log record got %v, want %v", gotRec, wantRec)
	}
	// Verify DAG state.
	if _, err := getNode(nil, svc.St(), objid, vers); err != nil {
	t.Fatalf("getNode can not find object %s vers %s in DAG, err %v", objid, vers, err)
	}
	// Verify Database state.
	tx := svc.St().NewTransaction()
	if _, err := watchable.GetAtVersion(nil, tx, []byte(objid), nil, []byte(vers)); err != nil {
	t.Fatalf("GetAtVersion can not find object %s vers %s in Database, err %v", objid, vers, err)
	}
	tx.Abort()
	parents = []string{vers}
	}

	// Verify conflict state.
	if len(iSt.updObjects) != 1 {
	t.Fatalf("Unexpected number of updated objects %d", len(iSt.updObjects))
	}
	st := iSt.updObjects[objid]
	if st.isConflict {
	t.Fatalf("Detected a conflict %v", st)
	}
	if st.newHead != "3" \|\| st.oldHead != NoVersion {
	t.Fatalf("Conflict detection didn't succeed %v", st)
	}

	// Verify genvec state.
	wantVecs := interfaces.Knowledge{
	"tb\xfefoo1": interfaces.GenVector{11: 3},
	"tb\xfebar": interfaces.GenVector{11: 0},
	}
	if !reflect.DeepEqual(iSt.updLocal, wantVecs) {
	t.Fatalf("Final local gen vec mismatch got %v, want %v", iSt.updLocal, wantVecs)
	}

	// Verify DAG state.
	if head, err := getHead(nil, svc.St(), objid); err != nil \|\| head != "3" {
	t.Fatalf("Invalid object %s head in DAG %v, err %v", objid, head, err)
	}

	// Verify Database state.
	valbuf, err := svc.St().Get([]byte(objid), nil)
	var val string
	if err := vom.Decode(valbuf, &val); err != nil {
	t.Fatalf("Value decode failed, err %v", err)
	}
	if err != nil \|\| val != "abc" {
	t.Fatalf("Invalid object %s in Database %v, err %v", objid, val, err)
	}
	tx := svc.St().NewTransaction()
	version, err := watchable.GetVersion(nil, tx, []byte(objid))
	if err != nil \|\| string(version) != "3" {
	t.Fatalf("Invalid object %s head in Database %v, err %v", objid, string(version), err)
	}
	tx.Abort()
	}

	// TestLogStreamNoConflict tests that a local and a remote log stream can be
	// correctly applied (when there are no conflicts). Commands are in files
	// testdata/<local-init-00.log.sync,remote-noconf-00.log.sync>.
	func TestLogStreamNoConflict(t *testing.T) {
	svc, iSt, cleanup := testInit(t, "local-init-00.log.sync", "remote-noconf-00.log.sync", false)
	defer cleanup()

	objid := util.JoinKeyParts(util.RowPrefix, "tb\xfefoo1")

	// Check all log records.
	var version uint64 = 1
	var parents []string
	for _, devid := range []uint64{10, 11} {
	var gen uint64
	for gen = 1; gen < 4; gen++ {
	gotRec, err := getLogRec(nil, svc.St(), logDataPrefix, devid, gen)
	if err != nil \|\| gotRec == nil {
	t.Fatalf("getLogRec can not find object %s:%d:%d, err %v",
	logDataPrefix, devid, gen, err)
	}
	vers := fmt.Sprintf("%d", version)
	wantRec := &LocalLogRec{
	Metadata: interfaces.LogRecMetadata{
	Id: devid,
	Gen: gen,
	RecType: interfaces.NodeRec,
	ObjId: objid,
	CurVers: vers,
	Parents: parents,
	UpdTime: constTime,
	BatchCount: 1,
	},
	Pos: gen - 1,
	}

	if !reflect.DeepEqual(gotRec, wantRec) {
	t.Fatalf("Data mismatch in log record got %v, want %v", gotRec, wantRec)
	}

	// Verify DAG state.
	if _, err := getNode(nil, svc.St(), objid, vers); err != nil {
	t.Fatalf("getNode can not find object %s vers %s in DAG, err %v", objid, vers, err)
	}
	// Verify Database state.
	tx := svc.St().NewTransaction()
	if _, err := watchable.GetAtVersion(nil, tx, []byte(objid), nil, []byte(vers)); err != nil {
	t.Fatalf("GetAtVersion can not find object %s vers %s in Database, err %v", objid, vers, err)
	}
	tx.Abort()
	parents = []string{vers}
	version++
	}
	}

	// Verify conflict state.
	if len(iSt.updObjects) != 1 {
	t.Fatalf("Unexpected number of updated objects %d", len(iSt.updObjects))
	}
	st := iSt.updObjects[objid]
	if st.isConflict {
	t.Fatalf("Detected a conflict %v", st)
	}
	if st.newHead != "6" \|\| st.oldHead != "3" {
	t.Fatalf("Conflict detection didn't succeed %v", st)
	}

	// Verify genvec state.
	wantVecs := interfaces.Knowledge{
	"tb\xfefoo1": interfaces.GenVector{11: 3},
	"tb\xfebar": interfaces.GenVector{11: 0},
	}
	if !reflect.DeepEqual(iSt.updLocal, wantVecs) {
	t.Fatalf("Final local gen vec failed got %v, want %v", iSt.updLocal, wantVecs)
	}

	// Verify DAG state.
	if head, err := getHead(nil, svc.St(), objid); err != nil \|\| head != "6" {
	t.Fatalf("Invalid object %s head in DAG %v, err %v", objid, head, err)
	}

	// Verify Database state.
	valbuf, err := svc.St().Get([]byte(objid), nil)
	var val string
	if err := vom.Decode(valbuf, &val); err != nil {
	t.Fatalf("Value decode failed, err %v", err)
	}
	if err != nil \|\| val != "abc" {
	t.Fatalf("Invalid object %s in Database %v, err %v", objid, val, err)
	}
	tx := svc.St().NewTransaction()
	versbuf, err := watchable.GetVersion(nil, tx, []byte(objid))
	if err != nil \|\| string(versbuf) != "6" {
	t.Fatalf("Invalid object %s head in Database %v, err %v", objid, string(versbuf), err)
	}
	tx.Abort()
	}

	// TestLogStreamConflict tests that a local and a remote log stream can be
	// correctly applied when there are conflicts. Commands are in files
	// testdata/<local-init-00.log.sync,remote-conf-00.log.sync>.
	func TestLogStreamConflict(t *testing.T) {
	svc, iSt, cleanup := testInit(t, "local-init-00.log.sync", "remote-conf-00.log.sync", false)
	defer cleanup()

	objid := util.JoinKeyParts(util.RowPrefix, "tb\xfefoo1")

	// Verify conflict state.
	if len(iSt.updObjects) != 1 {
	t.Fatalf("Unexpected number of updated objects %d", len(iSt.updObjects))
	}
	st := iSt.updObjects[objid]
	if !st.isConflict {
	t.Fatalf("Didn't detect a conflict %v", st)
	}
	if st.newHead != "6" \|\| st.oldHead != "3" \|\| st.ancestor != "2" {
	t.Fatalf("Conflict detection didn't succeed %v", st)
	}
	if st.res.ty != pickRemote {
	t.Fatalf("Conflict resolution did not pick remote: %v", st.res.ty)
	}

	// Verify DAG state.
	if head, err := getHead(nil, svc.St(), objid); err != nil \|\| head != "6" {
	t.Fatalf("Invalid object %s head in DAG %v, err %v", objid, head, err)
	}

	// Verify Database state.
	valbuf, err := svc.St().Get([]byte(objid), nil)
	var val string
	if err := vom.Decode(valbuf, &val); err != nil {
	t.Fatalf("Value decode failed, err %v", err)
	}
	if err != nil \|\| val != "abc" {
	t.Fatalf("Invalid object %s in Database %v, err %v", objid, string(valbuf), err)
	}
	tx := svc.St().NewTransaction()
	versbuf, err := watchable.GetVersion(nil, tx, []byte(objid))
	if err != nil \|\| string(versbuf) != "6" {
	t.Fatalf("Invalid object %s head in Database %v, err %v", objid, string(versbuf), err)
	}
	tx.Abort()
	}

	// TestLogStreamConflictNoAncestor tests that a local and a remote log stream
	// can be correctly applied when there are conflicts from the start where the
	// two versions of an object have no common ancestor. Commands are in files
	// testdata/<local-init-00.log.sync,remote-conf-03.log.sync>.
	func TestLogStreamConflictNoAncestor(t *testing.T) {
	svc, iSt, cleanup := testInit(t, "local-init-00.log.sync", "remote-conf-03.log.sync", false)
	defer cleanup()

	objid := util.JoinKeyParts(util.RowPrefix, "tb\xfefoo1")

	// Verify conflict state.
	if len(iSt.updObjects) != 1 {
	t.Fatalf("Unexpected number of updated objects %d", len(iSt.updObjects))
	}
	st := iSt.updObjects[objid]
	if !st.isConflict {
	t.Fatalf("Didn't detect a conflict %v", st)
	}
	if st.newHead != "6" \|\| st.oldHead != "3" \|\| st.ancestor != "" {
	t.Fatalf("Conflict detection didn't succeed %v", st)
	}
	if st.res.ty != pickRemote {
	t.Fatalf("Conflict resolution did not pick remote: %v", st.res.ty)
	}

	// Verify DAG state.
	if head, err := getHead(nil, svc.St(), objid); err != nil \|\| head != "6" {
	t.Fatalf("Invalid object %s head in DAG %v, err %v", objid, head, err)
	}

	// Verify Database state.
	valbuf, err := svc.St().Get([]byte(objid), nil)
	var val string
	if err := vom.Decode(valbuf, &val); err != nil {
	t.Fatalf("Value decode failed, err %v", err)
	}
	if err != nil \|\| val != "abc" {
	t.Fatalf("Invalid object %s in Database %v, err %v", objid, string(valbuf), err)
	}
	tx := svc.St().NewTransaction()
	versbuf, err := watchable.GetVersion(nil, tx, []byte(objid))
	if err != nil \|\| string(versbuf) != "6" {
	t.Fatalf("Invalid object %s head in Database %v, err %v", objid, string(versbuf), err)
	}
	tx.Abort()
	}

	//////////////////////////////
	// Helpers.

	func testInit(t testing.T, lfile, rfile string, sg bool) (mockService, *initiationState, func()) {
	// Set a large value to prevent the initiator from running.
	peerSyncInterval = 1 * time.Hour
	svc := createService(t)
	cleanup := func() {
	destroyService(t, svc)
	}

	// If there's an error during testInit, we bail out and should clean up after
	// ourselves.
	var err error
	defer func() {
	if err != nil {
	cleanup()
	}
	}()

	s := svc.sync
	s.id = 10 // initiator

	sgId1 := interfaces.GroupId(1234)
	gdb := appDbName("mockapp", "mockdb")
	nullInfo := wire.SyncgroupMemberInfo{}
	sgInfo := sgMemberInfo{
	sgId1: nullInfo,
	}
	info := &memberInfo{
	db2sg: map[string]sgMemberInfo{
	gdb: sgInfo,
	},
	mtTables: map[string]struct{}{
	"1/2/3/4": struct{}{},
	"5/6/7/8": struct{}{},
	},
	}

	sg1 := &interfaces.Syncgroup{
	Name: "sg1",
	Id: sgId1,
	AppName: "mockapp",
	DbName: "mockdb",
	Creator: "mockCreator",
	SpecVersion: "etag-0",
	Spec: wire.SyncgroupSpec{
	Prefixes: []wire.TableRow{{TableName: "foo", Row: ""}, {TableName: "bar", Row: ""}},
	MountTables: []string{"1/2/3/4", "5/6/7/8"},
	},
	Joiners: map[string]wire.SyncgroupMemberInfo{
	"a": nullInfo,
	"b": nullInfo,
	},
	}

	tx := svc.St().NewTransaction()
	if err = s.addSyncgroup(nil, tx, NoVersion, true, "", nil, s.id, 1, 1, sg1); err != nil {
	t.Fatalf("cannot add syncgroup ID %d, err %v", sg1.Id, err)
	}
	if err = tx.Commit(); err != nil {
	t.Fatalf("cannot commit adding syncgroup ID %d, err %v", sg1.Id, err)
	}

	if lfile != "" {
	replayLocalCommands(t, svc, lfile)
	}

	if rfile == "" {
	return svc, nil, cleanup
	}

	var c *initiationConfig
	if c, err = newInitiationConfig(nil, s, gdb, info.db2sg[gdb], connInfo{relName: "b", mtTbls: set.String.ToSlice(info.mtTables)}); err != nil {
	t.Fatalf("newInitiationConfig failed with err %v", err)
	}

	iSt := newInitiationState(nil, c, sg)

	sgs := make(sgSet)
	sgs[sgId1] = struct{}{}
	iSt.config.sgPfxs = map[string]sgSet{
	toTableRowPrefixStr(sg1.Spec.Prefixes[0]): sgs,
	toTableRowPrefixStr(sg1.Spec.Prefixes[1]): sgs,
	}

	sort.Strings(iSt.config.peer.mtTbls)
	sort.Strings(sg1.Spec.MountTables)

	if !reflect.DeepEqual(iSt.config.peer.mtTbls, sg1.Spec.MountTables) {
	// Set err so that the deferred cleanup func runs.
	err = fmt.Errorf("Mount tables are not equal: config %v, spec %v", iSt.config.peer.mtTbls, sg1.Spec.MountTables)
	t.Fatal(err)
	}

	s.initSyncStateInMem(nil, "mockapp", "mockdb", sgOID(sgId1))

	iSt.stream = createReplayStream(t, rfile)

	var wantVecs interfaces.Knowledge
	if sg {
	if err = iSt.prepareSGDeltaReq(nil); err != nil {
	t.Fatalf("prepareSGDeltaReq failed with err %v", err)
	}
	sg := fmt.Sprintf("%d", sgId1)
	wantVecs = interfaces.Knowledge{
	sg: interfaces.GenVector{10: 0},
	}
	} else {
	if err = iSt.prepareDataDeltaReq(nil); err != nil {
	t.Fatalf("prepareDataDeltaReq failed with err %v", err)
	}

	wantVecs = interfaces.Knowledge{
	"foo\xfe": interfaces.GenVector{10: 0},
	"bar\xfe": interfaces.GenVector{10: 0},
	}
	}

	if !reflect.DeepEqual(iSt.local, wantVecs) {
	// Set err so that the deferred cleanup func runs.
	err = fmt.Errorf("createLocalGenVec failed: got %v, want %v", iSt.local, wantVecs)
	t.Fatal(err)
	}

	if err = iSt.recvAndProcessDeltas(nil); err != nil {
	t.Fatalf("recvAndProcessDeltas failed with err %v", err)
	}

	if err = iSt.processUpdatedObjects(nil); err != nil {
	t.Fatalf("processUpdatedObjects failed with err %v", err)
	}
	return svc, iSt, cleanup
	}