// ToJSON returns a JSON representation of the object.
func (n *ActionNode) ToJSON() string {
result := jscfg.ToJSON(n) + "\n"
if n.Args == nil {
result += "{}\n"
} else {
result += jscfg.ToJSON(n.Args) + "\n"
}
if n.Reply == nil {
result += "{}\n"
} else {
result += jscfg.ToJSON(n.Reply) + "\n"
}
return result
}
func commandVtGateSplitQuery(ctx context.Context, wr *wrangler.Wrangler, subFlags *flag.FlagSet, args []string) error {
server := subFlags.String("server", "", "VtGate server to connect to")
bindVariables := newBindvars(subFlags)
connectTimeout := subFlags.Duration("connect_timeout", 30*time.Second, "Connection timeout for vtgate client")
splitColumn := subFlags.String("split_column", "", "force the use of this column to split the query")
splitCount := subFlags.Int("split_count", 16, "number of splits to generate")
keyspace := subFlags.String("keyspace", "", "keyspace to send query to")
if err := subFlags.Parse(args); err != nil {
return err
}
if subFlags.NArg() != 1 {
return fmt.Errorf("the <sql> argument is required for the VtGateSplitQuery command")
}
vtgateConn, err := vtgateconn.Dial(ctx, *server, *connectTimeout)
if err != nil {
return fmt.Errorf("error connecting to vtgate '%v': %v", *server, err)
}
defer vtgateConn.Close()
r, err := vtgateConn.SplitQuery(ctx, *keyspace, tproto.BoundQuery{
Sql: subFlags.Arg(0),
BindVariables: *bindVariables,
}, *splitColumn, *splitCount)
if err != nil {
return fmt.Errorf("SplitQuery failed: %v", err)
}
wr.Logger().Printf("%v\n", jscfg.ToJSON(r))
return nil
}
// UpdateShardReplicationFields is part of the topo.Server interface
func (zkts *Server) UpdateShardReplicationFields(ctx context.Context, cell, keyspace, shard string, update func(*pb.ShardReplication) error) error {
// create the parent directory to be sure it's here
zkDir := path.Join("/zk", cell, "vt", "replication", keyspace)
if _, err := zk.CreateRecursive(zkts.zconn, zkDir, "", 0, zookeeper.WorldACL(zookeeper.PERM_ALL)); err != nil && !zookeeper.IsError(err, zookeeper.ZNODEEXISTS) {
return err
}
// now update the data
zkPath := shardReplicationPath(cell, keyspace, shard)
f := func(oldValue string, oldStat zk.Stat) (string, error) {
sr := &pb.ShardReplication{}
if oldValue != "" {
if err := json.Unmarshal([]byte(oldValue), sr); err != nil {
return "", err
}
}
if err := update(sr); err != nil {
return "", err
}
return jscfg.ToJSON(sr), nil
}
err := zkts.zconn.RetryChange(zkPath, 0, zookeeper.WorldACL(zookeeper.PERM_ALL), f)
if err != nil {
if zookeeper.IsError(err, zookeeper.ZNONODE) {
err = topo.ErrNoNode
}
return err
}
return nil
}
// CreateShard implements topo.Server.
func (s *Server) CreateShard(ctx context.Context, keyspace, shard string, value *topo.Shard) error {
data := jscfg.ToJSON(value)
global := s.getGlobal()
resp, err := global.Create(shardFilePath(keyspace, shard), data, 0 /* ttl */)
if err != nil {
return convertError(err)
}
if err := initLockFile(global, shardDirPath(keyspace, shard)); err != nil {
return err
}
// We don't return ErrBadResponse in this case because the Create() suceeeded
// and we don't really need the version to satisfy our contract - we're only
// logging it.
version := int64(-1)
if resp.Node != nil {
version = int64(resp.Node.ModifiedIndex)
}
event.Dispatch(&events.ShardChange{
ShardInfo: *topo.NewShardInfo(keyspace, shard, value, version),
Status: "created",
})
return nil
}
// CreateShard is part of the topo.Server interface
func (zkts *Server) CreateShard(ctx context.Context, keyspace, shard string, value *pb.Shard) error {
shardPath := path.Join(globalKeyspacesPath, keyspace, "shards", shard)
pathList := []string{
shardPath,
path.Join(shardPath, "action"),
path.Join(shardPath, "actionlog"),
}
alreadyExists := false
for i, zkPath := range pathList {
c := ""
if i == 0 {
c = jscfg.ToJSON(value)
}
_, err := zk.CreateRecursive(zkts.zconn, zkPath, c, 0, zookeeper.WorldACL(zookeeper.PERM_ALL))
if err != nil {
if zookeeper.IsError(err, zookeeper.ZNODEEXISTS) {
alreadyExists = true
} else {
return fmt.Errorf("error creating shard: %v %v", zkPath, err)
}
}
}
if alreadyExists {
return topo.ErrNodeExists
}
event.Dispatch(&events.ShardChange{
ShardInfo: *topo.NewShardInfo(keyspace, shard, value, -1),
Status: "created",
})
return nil
}
func TestHandlePathShard(t *testing.T) {
input := path.Join(explorerRoot, "global", shardDirPath("test_keyspace", "-80"))
cells := []string{"cell1", "cell2", "cell3"}
keyspace := &pb.Keyspace{}
shard := &pb.Shard{}
want := jscfg.ToJSON(shard)
ctx := context.Background()
ts := newTestServer(t, cells)
if err := ts.CreateKeyspace(ctx, "test_keyspace", keyspace); err != nil {
t.Fatalf("CreateKeyspace error: %v", err)
}
if err := ts.CreateShard(ctx, "test_keyspace", "-80", shard); err != nil {
t.Fatalf("CreateShard error: %v", err)
}
m := &mockActionRepo{}
ex := NewExplorer(ts)
result := ex.HandlePath(m, input, nil)
exResult := result.(*explorerResult)
if got := exResult.Data; got != want {
t.Errorf("HandlePath(%q) = %q, want %q", input, got, want)
}
if m.shardActions == nil {
t.Errorf("ActionRepository.PopulateShardActions not called")
}
if m.keyspace != "test_keyspace" {
t.Errorf("ActionRepository called with keyspace %q, want %q", m.keyspace, "test_keyspace")
}
if m.shard != "-80" {
t.Errorf("ActionRepository called with shard %q, want %q", m.shard, "-80")
}
}
// UpdateEndPoints is part of the topo.Server interface
func (zkts *Server) UpdateEndPoints(ctx context.Context, cell, keyspace, shard string, tabletType topo.TabletType, addrs *pb.EndPoints, existingVersion int64) error {
path := zkPathForVtName(cell, keyspace, shard, tabletType)
data := jscfg.ToJSON(addrs)
if existingVersion == -1 {
// Update or create unconditionally.
_, err := zk.CreateRecursive(zkts.zconn, path, data, 0, zookeeper.WorldACL(zookeeper.PERM_ALL))
if err != nil {
if zookeeper.IsError(err, zookeeper.ZNODEEXISTS) {
// Node already exists - just stomp away. Multiple writers shouldn't be here.
// We use RetryChange here because it won't update the node unnecessarily.
f := func(oldValue string, oldStat zk.Stat) (string, error) {
return data, nil
}
err = zkts.zconn.RetryChange(path, 0, zookeeper.WorldACL(zookeeper.PERM_ALL), f)
}
}
return err
}
// Compare And Set
_, err := zkts.zconn.Set(path, data, int(existingVersion))
if err != nil {
if zookeeper.IsError(err, zookeeper.ZBADVERSION) {
err = topo.ErrBadVersion
} else if zookeeper.IsError(err, zookeeper.ZNONODE) {
err = topo.ErrNoNode
}
}
return err
}
func commandVtGateExecuteShard(ctx context.Context, wr *wrangler.Wrangler, subFlags *flag.FlagSet, args []string) error {
server := subFlags.String("server", "", "VtGate server to connect to")
bindVariables := newBindvars(subFlags)
connectTimeout := subFlags.Duration("connect_timeout", 30*time.Second, "Connection timeout for vtgate client")
tabletType := subFlags.String("tablet_type", "master", "tablet type to query")
keyspace := subFlags.String("keyspace", "", "keyspace to send query to")
shardsStr := subFlags.String("shards", "", "comma-separated list of shards to send query to")
if err := subFlags.Parse(args); err != nil {
return err
}
if subFlags.NArg() != 1 {
return fmt.Errorf("the <sql> argument is required for the VtGateExecuteShard command")
}
t, err := parseTabletType(*tabletType, []topo.TabletType{topo.TYPE_MASTER, topo.TYPE_REPLICA, topo.TYPE_RDONLY})
if err != nil {
return err
}
var shards []string
if *shardsStr != "" {
shards = strings.Split(*shardsStr, ",")
}
vtgateConn, err := vtgateconn.Dial(ctx, *server, *connectTimeout)
if err != nil {
return fmt.Errorf("error connecting to vtgate '%v': %v", *server, err)
}
defer vtgateConn.Close()
qr, err := vtgateConn.ExecuteShard(ctx, subFlags.Arg(0), *keyspace, shards, *bindVariables, t)
if err != nil {
return fmt.Errorf("Execute failed: %v", err)
}
wr.Logger().Printf("%v\n", jscfg.ToJSON(qr))
return nil
}
// CreateEndPoints implements topo.Server.
func (s *Server) CreateEndPoints(ctx context.Context, cellName, keyspace, shard string, tabletType topo.TabletType, addrs *pb.EndPoints) error {
cell, err := s.getCell(cellName)
if err != nil {
return err
}
// Set only if it doesn't exist.
_, err = cell.Create(endPointsFilePath(keyspace, shard, string(tabletType)), jscfg.ToJSON(addrs), 0 /* ttl */)
return convertError(err)
}
// UpdateSrvKeyspace is part of the topo.Server interface
func (zkts *Server) UpdateSrvKeyspace(ctx context.Context, cell, keyspace string, srvKeyspace *topo.SrvKeyspace) error {
path := zkPathForVtKeyspace(cell, keyspace)
data := jscfg.ToJSON(srvKeyspace)
_, err := zkts.zconn.Set(path, data, -1)
if zookeeper.IsError(err, zookeeper.ZNONODE) {
_, err = zk.CreateRecursive(zkts.zconn, path, data, 0, zookeeper.WorldACL(zookeeper.PERM_ALL))
}
return err
}
// CreateEndPoints is part of the topo.Server interface
func (zkts *Server) CreateEndPoints(ctx context.Context, cell, keyspace, shard string, tabletType topo.TabletType, addrs *pb.EndPoints) error {
path := zkPathForVtName(cell, keyspace, shard, tabletType)
data := jscfg.ToJSON(addrs)
// Create only if it doesn't exist.
_, err := zk.CreateRecursive(zkts.zconn, path, data, 0, zookeeper.WorldACL(zookeeper.PERM_ALL))
if zookeeper.IsError(err, zookeeper.ZNODEEXISTS) {
err = topo.ErrNodeExists
}
return err
}
// UpdateSrvKeyspace implements topo.Server.
func (s *Server) UpdateSrvKeyspace(ctx context.Context, cellName, keyspace string, srvKeyspace *topo.SrvKeyspace) error {
cell, err := s.getCell(cellName)
if err != nil {
return err
}
data := jscfg.ToJSON(srvKeyspace)
_, err = cell.Set(srvKeyspaceFilePath(keyspace), data, 0 /* ttl */)
return convertError(err)
}
// UpdateSrvShard implements topo.Server.
func (s *Server) UpdateSrvShard(ctx context.Context, cellName, keyspace, shard string, srvShard *pb.SrvShard) error {
cell, err := s.getCell(cellName)
if err != nil {
return err
}
data := jscfg.ToJSON(srvShard)
_, err = cell.Set(srvShardFilePath(keyspace, shard), data, 0 /* ttl */)
return convertError(err)
}
// updateEndPoints updates the EndPoints file only if the version matches.
func (s *Server) updateEndPoints(cellName, keyspace, shard string, tabletType topo.TabletType, addrs *pb.EndPoints, version int64) error {
cell, err := s.getCell(cellName)
if err != nil {
return err
}
data := jscfg.ToJSON(addrs)
_, err = cell.CompareAndSwap(endPointsFilePath(keyspace, shard, string(tabletType)), data, 0, /* ttl */
"" /* prevValue */, uint64(version))
return convertError(err)
}
// init phase:
// - read the destination keyspace, make sure it has 'servedFrom' values
func (scw *SplitCloneWorker) init(ctx context.Context) error {
scw.setState(WorkerStateInit)
var err error
// read the keyspace and validate it
scw.keyspaceInfo, err = scw.wr.TopoServer().GetKeyspace(ctx, scw.keyspace)
if err != nil {
return fmt.Errorf("cannot read keyspace %v: %v", scw.keyspace, err)
}
// find the OverlappingShards in the keyspace
osList, err := topotools.FindOverlappingShards(ctx, scw.wr.TopoServer(), scw.keyspace)
if err != nil {
return fmt.Errorf("cannot FindOverlappingShards in %v: %v", scw.keyspace, err)
}
// find the shard we mentioned in there, if any
os := topotools.OverlappingShardsForShard(osList, scw.shard)
if os == nil {
return fmt.Errorf("the specified shard %v/%v is not in any overlapping shard", scw.keyspace, scw.shard)
}
scw.wr.Logger().Infof("Found overlapping shards: %v\n", jscfg.ToJSON(os))
// one side should have served types, the other one none,
// figure out wich is which, then double check them all
if len(os.Left[0].ServedTypes) > 0 {
scw.sourceShards = os.Left
scw.destinationShards = os.Right
} else {
scw.sourceShards = os.Right
scw.destinationShards = os.Left
}
// validate all serving types
servingTypes := []pb.TabletType{pb.TabletType_MASTER, pb.TabletType_REPLICA, pb.TabletType_RDONLY}
for _, st := range servingTypes {
for _, si := range scw.sourceShards {
if si.GetServedType(st) == nil {
return fmt.Errorf("source shard %v/%v is not serving type %v", si.Keyspace(), si.ShardName(), st)
}
}
}
for _, si := range scw.destinationShards {
if len(si.ServedTypes) > 0 {
return fmt.Errorf("destination shard %v/%v is serving some types", si.Keyspace(), si.ShardName())
}
}
return nil
}
// UpdateEndPoints implements topo.Server.
func (s *Server) UpdateEndPoints(ctx context.Context, cellName, keyspace, shard string, tabletType topo.TabletType, addrs *pb.EndPoints, existingVersion int64) error {
cell, err := s.getCell(cellName)
if err != nil {
return err
}
if existingVersion == -1 {
// Set unconditionally.
_, err := cell.Set(endPointsFilePath(keyspace, shard, string(tabletType)), jscfg.ToJSON(addrs), 0 /* ttl */)
return convertError(err)
}
// Update only if version matches.
return s.updateEndPoints(cellName, keyspace, shard, tabletType, addrs, existingVersion)
}
func TestExtraFieldsJson(t *testing.T) {
swra := &SlaveWasRestartedArgs{
Parent: topo.TabletAlias{
Uid: 1,
Cell: "aa",
},
}
data := jscfg.ToJSON(swra)
output := &slaveWasRestartedTestArgs{}
decoder := json.NewDecoder(strings.NewReader(data))
err := decoder.Decode(output)
if err != nil {
t.Errorf("Cannot re-decode struct without field: %v", err)
}
}
// UpdateShard is part of the topo.Server interface
func (zkts *Server) UpdateShard(ctx context.Context, si *topo.ShardInfo, existingVersion int64) (int64, error) {
shardPath := path.Join(globalKeyspacesPath, si.Keyspace(), "shards", si.ShardName())
stat, err := zkts.zconn.Set(shardPath, jscfg.ToJSON(si.Shard), int(existingVersion))
if err != nil {
if zookeeper.IsError(err, zookeeper.ZNONODE) {
err = topo.ErrNoNode
}
return -1, err
}
event.Dispatch(&events.ShardChange{
ShardInfo: *si,
Status: "updated",
})
return int64(stat.Version()), nil
}
// UpdateKeyspace is part of the topo.Server interface
func (zkts *Server) UpdateKeyspace(ctx context.Context, ki *topo.KeyspaceInfo, existingVersion int64) (int64, error) {
keyspacePath := path.Join(globalKeyspacesPath, ki.KeyspaceName())
data := jscfg.ToJSON(ki.Keyspace)
stat, err := zkts.zconn.Set(keyspacePath, data, int(existingVersion))
if err != nil {
if zookeeper.IsError(err, zookeeper.ZNONODE) {
err = topo.ErrNoNode
}
return -1, err
}
event.Dispatch(&events.KeyspaceChange{
KeyspaceInfo: *ki,
Status: "updated",
})
return int64(stat.Version()), nil
}
// UpdateShard implements topo.Server.
func (s *Server) UpdateShard(ctx context.Context, si *topo.ShardInfo, existingVersion int64) (int64, error) {
data := jscfg.ToJSON(si.Shard)
resp, err := s.getGlobal().CompareAndSwap(shardFilePath(si.Keyspace(), si.ShardName()),
data, 0 /* ttl */, "" /* prevValue */, uint64(existingVersion))
if err != nil {
return -1, convertError(err)
}
if resp.Node == nil {
return -1, ErrBadResponse
}
event.Dispatch(&events.ShardChange{
ShardInfo: *si,
Status: "updated",
})
return int64(resp.Node.ModifiedIndex), nil
}
func (s *Server) updateShardReplication(sri *topo.ShardReplicationInfo, existingVersion int64) (int64, error) {
cell, err := s.getCell(sri.Cell())
if err != nil {
return -1, err
}
data := jscfg.ToJSON(sri.ShardReplication)
resp, err := cell.CompareAndSwap(shardReplicationFilePath(sri.Keyspace(), sri.Shard()),
data, 0 /* ttl */, "" /* prevValue */, uint64(existingVersion))
if err != nil {
return -1, convertError(err)
}
if resp.Node == nil {
return -1, ErrBadResponse
}
return int64(resp.Node.ModifiedIndex), nil
}
func (s *Server) createShardReplication(sri *topo.ShardReplicationInfo) (int64, error) {
cell, err := s.getCell(sri.Cell())
if err != nil {
return -1, err
}
data := jscfg.ToJSON(sri.ShardReplication)
resp, err := cell.Create(shardReplicationFilePath(sri.Keyspace(), sri.Shard()),
data, 0 /* ttl */)
if err != nil {
return -1, convertError(err)
}
if resp.Node == nil {
return -1, ErrBadResponse
}
return int64(resp.Node.ModifiedIndex), nil
}
// CreateTablet implements topo.Server.
func (s *Server) CreateTablet(ctx context.Context, tablet *topo.Tablet) error {
cell, err := s.getCell(tablet.Alias.Cell)
if err != nil {
return err
}
data := jscfg.ToJSON(tablet)
_, err = cell.Create(tabletFilePath(tablet.Alias.String()), data, 0 /* ttl */)
if err != nil {
return convertError(err)
}
event.Dispatch(&events.TabletChange{
Tablet: *tablet,
Status: "created",
})
return nil
}
// UpdateSrvShard is part of the topo.Server interface
func (zkts *Server) UpdateSrvShard(ctx context.Context, cell, keyspace, shard string, srvShard *topo.SrvShard) error {
path := zkPathForVtShard(cell, keyspace, shard)
data := jscfg.ToJSON(srvShard)
// Update or create unconditionally.
_, err := zk.CreateRecursive(zkts.zconn, path, data, 0, zookeeper.WorldACL(zookeeper.PERM_ALL))
if err != nil {
if zookeeper.IsError(err, zookeeper.ZNODEEXISTS) {
// Node already exists - just stomp away. Multiple writers shouldn't be here.
// We use RetryChange here because it won't update the node unnecessarily.
f := func(oldValue string, oldStat zk.Stat) (string, error) {
return data, nil
}
err = zkts.zconn.RetryChange(path, 0, zookeeper.WorldACL(zookeeper.PERM_ALL), f)
}
}
return err
}
func TestMissingFieldsJson(t *testing.T) {
swra := &slaveWasRestartedTestArgs{
Parent: topo.TabletAlias{
Uid: 1,
Cell: "aa",
},
ExpectedMasterAddr: "a1",
ExpectedMasterIPAddr: "i1",
ScrapStragglers: true,
}
data := jscfg.ToJSON(swra)
output := &SlaveWasRestartedArgs{}
decoder := json.NewDecoder(strings.NewReader(data))
err := decoder.Decode(output)
if err != nil {
t.Errorf("Cannot re-decode struct without field: %v", err)
}
}
func commandVtTabletExecute(ctx context.Context, wr *wrangler.Wrangler, subFlags *flag.FlagSet, args []string) error {
transactionID := subFlags.Int("transaction_id", 0, "transaction id to use, if inside a transaction.")
bindVariables := newBindvars(subFlags)
keyspace := subFlags.String("keyspace", "", "keyspace the tablet belongs to")
shard := subFlags.String("shard", "", "shard the tablet belongs to")
tabletType := subFlags.String("tablet_type", "unknown", "tablet type we expect from the tablet (use unknown to use sessionId)")
connectTimeout := subFlags.Duration("connect_timeout", 30*time.Second, "Connection timeout for vttablet client")
if err := subFlags.Parse(args); err != nil {
return err
}
if subFlags.NArg() != 2 {
return fmt.Errorf("the <tablet_alis> and <sql> arguments are required for the VtTabletExecute command")
}
tt, err := parseTabletType3(*tabletType)
if err != nil {
return err
}
tabletAlias, err := topo.ParseTabletAliasString(subFlags.Arg(0))
if err != nil {
return err
}
tabletInfo, err := wr.TopoServer().GetTablet(ctx, tabletAlias)
if err != nil {
return err
}
ep, err := tabletInfo.EndPoint()
if err != nil {
return fmt.Errorf("cannot get EndPoint from tablet record: %v", err)
}
conn, err := tabletconn.GetDialer()(ctx, ep, *keyspace, *shard, tt, *connectTimeout)
if err != nil {
return fmt.Errorf("cannot connect to tablet %v: %v", tabletAlias, err)
}
defer conn.Close()
qr, err := conn.Execute(ctx, subFlags.Arg(1), *bindVariables, int64(*transactionID))
if err != nil {
return fmt.Errorf("Execute failed: %v", err)
}
wr.Logger().Printf("%v\n", jscfg.ToJSON(qr))
return nil
}
// UpdateTablet implements topo.Server.
func (s *Server) UpdateTablet(ctx context.Context, ti *topo.TabletInfo, existingVersion int64) (int64, error) {
cell, err := s.getCell(ti.Alias.Cell)
if err != nil {
return -1, err
}
data := jscfg.ToJSON(ti.Tablet)
resp, err := cell.CompareAndSwap(tabletFilePath(ti.Alias.String()),
data, 0 /* ttl */, "" /* prevValue */, uint64(existingVersion))
if err != nil {
return -1, convertError(err)
}
if resp.Node == nil {
return -1, ErrBadResponse
}
event.Dispatch(&events.TabletChange{
Tablet: *ti.Tablet,
Status: "updated",
})
return int64(resp.Node.ModifiedIndex), nil
}
func TestHandlePathTablet(t *testing.T) {
input := path.Join(explorerRoot, "cell1", tabletDirPath("cell1-0000000123"))
cells := []string{"cell1", "cell2", "cell3"}
tablet := &topo.Tablet{
Alias: topo.TabletAlias{Cell: "cell1", Uid: 123},
Hostname: "example.com",
Portmap: map[string]int{"vt": 4321},
}
want := jscfg.ToJSON(tablet)
ctx := context.Background()
ts := newTestServer(t, cells)
if err := ts.CreateTablet(ctx, tablet); err != nil {
t.Fatalf("CreateTablet error: %v", err)
}
m := &mockActionRepo{}
ex := NewExplorer(ts)
result := ex.HandlePath(m, input, nil)
exResult := result.(*explorerResult)
if got := exResult.Data; got != want {
t.Errorf("HandlePath(%q) = %q, want %q", input, got, want)
}
wantLinks := map[string]template.URL{
"status": template.URL("http://example.com:4321/debug/status"),
}
for k, want := range wantLinks {
if got := exResult.Links[k]; got != want {
t.Errorf("Links[%q] = %v, want %v", k, got, want)
}
}
if m.tabletActions == nil {
t.Errorf("ActionRepository.PopulateTabletActions not called")
}
if m.tablet != "cell1-0000000123" {
t.Errorf("ActionRepository called with tablet %q, want %q", m.tablet, "cell1-0000000123")
}
}
func (zkts *Server) updateTabletEndpoint(oldValue string, oldStat zk.Stat, addr *pb.EndPoint) (newValue string, err error) {
if oldStat == nil {
// The incoming object doesn't exist - we haven't been placed in the serving
// graph yet, so don't update. Assume the next process that rebuilds the graph
// will get the updated tablet location.
return "", errSkipUpdate
}
var addrs *pb.EndPoints
if oldValue != "" {
addrs = &pb.EndPoints{}
if len(oldValue) > 0 {
if err := json.Unmarshal([]byte(oldValue), addrs); err != nil {
return "", fmt.Errorf("EndPoints unmarshal failed: %v %v", oldValue, err)
}
}
foundTablet := false
for i, entry := range addrs.Entries {
if entry.Uid == addr.Uid {
foundTablet = true
if !topo.EndPointEquality(entry, addr) {
addrs.Entries[i] = addr
}
break
}
}
if !foundTablet {
addrs.Entries = append(addrs.Entries, addr)
}
} else {
addrs = topo.NewEndPoints()
addrs.Entries = append(addrs.Entries, addr)
}
return jscfg.ToJSON(addrs), nil
}
// UpdateTabletFields is part of the topo.Server interface
func (zkts *Server) UpdateTabletFields(ctx context.Context, tabletAlias topo.TabletAlias, update func(*topo.Tablet) error) error {
// Store the last tablet value so we can log it if the change succeeds.
var lastTablet *topo.Tablet
zkTabletPath := TabletPathForAlias(tabletAlias)
f := func(oldValue string, oldStat zk.Stat) (string, error) {
if oldValue == "" {
return "", fmt.Errorf("no data for tablet addr update: %v", tabletAlias)
}
tablet, err := tabletFromJSON(oldValue)
if err != nil {
return "", err
}
if err := update(tablet); err != nil {
return "", err
}
lastTablet = tablet
return jscfg.ToJSON(tablet), nil
}
err := zkts.zconn.RetryChange(zkTabletPath, 0, zookeeper.WorldACL(zookeeper.PERM_ALL), f)
if err != nil {
if zookeeper.IsError(err, zookeeper.ZNONODE) {
err = topo.ErrNoNode
}
return err
}
if lastTablet != nil {
event.Dispatch(&events.TabletChange{
Tablet: *lastTablet,
Status: "updated",
})
}
return nil
}