initial add - go fmt on grpc
Change-Id: Ib0afadd2fe5571d1456a091f94f5644458f7d3f4
diff --git a/vendor/google.golang.org/grpc/internal/channelz/types.go b/vendor/google.golang.org/grpc/internal/channelz/types.go
new file mode 100644
index 0000000..17c2274
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/channelz/types.go
@@ -0,0 +1,702 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package channelz
+
+import (
+ "net"
+ "sync"
+ "sync/atomic"
+ "time"
+
+ "google.golang.org/grpc/connectivity"
+ "google.golang.org/grpc/credentials"
+ "google.golang.org/grpc/grpclog"
+)
+
+// entry represents a node in the channelz database.
+type entry interface {
+ // addChild adds a child e, whose channelz id is id to child list
+ addChild(id int64, e entry)
+ // deleteChild deletes a child with channelz id to be id from child list
+ deleteChild(id int64)
+ // triggerDelete tries to delete self from channelz database. However, if child
+ // list is not empty, then deletion from the database is on hold until the last
+ // child is deleted from database.
+ triggerDelete()
+ // deleteSelfIfReady check whether triggerDelete() has been called before, and whether child
+ // list is now empty. If both conditions are met, then delete self from database.
+ deleteSelfIfReady()
+ // getParentID returns parent ID of the entry. 0 value parent ID means no parent.
+ getParentID() int64
+}
+
+// dummyEntry is a fake entry to handle entry not found case.
+type dummyEntry struct {
+ idNotFound int64
+}
+
+func (d *dummyEntry) addChild(id int64, e entry) {
+ // Note: It is possible for a normal program to reach here under race condition.
+ // For example, there could be a race between ClientConn.Close() info being propagated
+ // to addrConn and http2Client. ClientConn.Close() cancel the context and result
+ // in http2Client to error. The error info is then caught by transport monitor
+ // and before addrConn.tearDown() is called in side ClientConn.Close(). Therefore,
+ // the addrConn will create a new transport. And when registering the new transport in
+ // channelz, its parent addrConn could have already been torn down and deleted
+ // from channelz tracking, and thus reach the code here.
+ grpclog.Infof("attempt to add child of type %T with id %d to a parent (id=%d) that doesn't currently exist", e, id, d.idNotFound)
+}
+
+func (d *dummyEntry) deleteChild(id int64) {
+ // It is possible for a normal program to reach here under race condition.
+ // Refer to the example described in addChild().
+ grpclog.Infof("attempt to delete child with id %d from a parent (id=%d) that doesn't currently exist", id, d.idNotFound)
+}
+
+func (d *dummyEntry) triggerDelete() {
+ grpclog.Warningf("attempt to delete an entry (id=%d) that doesn't currently exist", d.idNotFound)
+}
+
+func (*dummyEntry) deleteSelfIfReady() {
+ // code should not reach here. deleteSelfIfReady is always called on an existing entry.
+}
+
+func (*dummyEntry) getParentID() int64 {
+ return 0
+}
+
+// ChannelMetric defines the info channelz provides for a specific Channel, which
+// includes ChannelInternalMetric and channelz-specific data, such as channelz id,
+// child list, etc.
+type ChannelMetric struct {
+ // ID is the channelz id of this channel.
+ ID int64
+ // RefName is the human readable reference string of this channel.
+ RefName string
+ // ChannelData contains channel internal metric reported by the channel through
+ // ChannelzMetric().
+ ChannelData *ChannelInternalMetric
+ // NestedChans tracks the nested channel type children of this channel in the format of
+ // a map from nested channel channelz id to corresponding reference string.
+ NestedChans map[int64]string
+ // SubChans tracks the subchannel type children of this channel in the format of a
+ // map from subchannel channelz id to corresponding reference string.
+ SubChans map[int64]string
+ // Sockets tracks the socket type children of this channel in the format of a map
+ // from socket channelz id to corresponding reference string.
+ // Note current grpc implementation doesn't allow channel having sockets directly,
+ // therefore, this is field is unused.
+ Sockets map[int64]string
+ // Trace contains the most recent traced events.
+ Trace *ChannelTrace
+}
+
+// SubChannelMetric defines the info channelz provides for a specific SubChannel,
+// which includes ChannelInternalMetric and channelz-specific data, such as
+// channelz id, child list, etc.
+type SubChannelMetric struct {
+ // ID is the channelz id of this subchannel.
+ ID int64
+ // RefName is the human readable reference string of this subchannel.
+ RefName string
+ // ChannelData contains subchannel internal metric reported by the subchannel
+ // through ChannelzMetric().
+ ChannelData *ChannelInternalMetric
+ // NestedChans tracks the nested channel type children of this subchannel in the format of
+ // a map from nested channel channelz id to corresponding reference string.
+ // Note current grpc implementation doesn't allow subchannel to have nested channels
+ // as children, therefore, this field is unused.
+ NestedChans map[int64]string
+ // SubChans tracks the subchannel type children of this subchannel in the format of a
+ // map from subchannel channelz id to corresponding reference string.
+ // Note current grpc implementation doesn't allow subchannel to have subchannels
+ // as children, therefore, this field is unused.
+ SubChans map[int64]string
+ // Sockets tracks the socket type children of this subchannel in the format of a map
+ // from socket channelz id to corresponding reference string.
+ Sockets map[int64]string
+ // Trace contains the most recent traced events.
+ Trace *ChannelTrace
+}
+
+// ChannelInternalMetric defines the struct that the implementor of Channel interface
+// should return from ChannelzMetric().
+type ChannelInternalMetric struct {
+ // current connectivity state of the channel.
+ State connectivity.State
+ // The target this channel originally tried to connect to. May be absent
+ Target string
+ // The number of calls started on the channel.
+ CallsStarted int64
+ // The number of calls that have completed with an OK status.
+ CallsSucceeded int64
+ // The number of calls that have a completed with a non-OK status.
+ CallsFailed int64
+ // The last time a call was started on the channel.
+ LastCallStartedTimestamp time.Time
+}
+
+// ChannelTrace stores traced events on a channel/subchannel and related info.
+type ChannelTrace struct {
+ // EventNum is the number of events that ever got traced (i.e. including those that have been deleted)
+ EventNum int64
+ // CreationTime is the creation time of the trace.
+ CreationTime time.Time
+ // Events stores the most recent trace events (up to $maxTraceEntry, newer event will overwrite the
+ // oldest one)
+ Events []*TraceEvent
+}
+
+// TraceEvent represent a single trace event
+type TraceEvent struct {
+ // Desc is a simple description of the trace event.
+ Desc string
+ // Severity states the severity of this trace event.
+ Severity Severity
+ // Timestamp is the event time.
+ Timestamp time.Time
+ // RefID is the id of the entity that gets referenced in the event. RefID is 0 if no other entity is
+ // involved in this event.
+ // e.g. SubChannel (id: 4[]) Created. --> RefID = 4, RefName = "" (inside [])
+ RefID int64
+ // RefName is the reference name for the entity that gets referenced in the event.
+ RefName string
+ // RefType indicates the referenced entity type, i.e Channel or SubChannel.
+ RefType RefChannelType
+}
+
+// Channel is the interface that should be satisfied in order to be tracked by
+// channelz as Channel or SubChannel.
+type Channel interface {
+ ChannelzMetric() *ChannelInternalMetric
+}
+
+type dummyChannel struct{}
+
+func (d *dummyChannel) ChannelzMetric() *ChannelInternalMetric {
+ return &ChannelInternalMetric{}
+}
+
+type channel struct {
+ refName string
+ c Channel
+ closeCalled bool
+ nestedChans map[int64]string
+ subChans map[int64]string
+ id int64
+ pid int64
+ cm *channelMap
+ trace *channelTrace
+ // traceRefCount is the number of trace events that reference this channel.
+ // Non-zero traceRefCount means the trace of this channel cannot be deleted.
+ traceRefCount int32
+}
+
+func (c *channel) addChild(id int64, e entry) {
+ switch v := e.(type) {
+ case *subChannel:
+ c.subChans[id] = v.refName
+ case *channel:
+ c.nestedChans[id] = v.refName
+ default:
+ grpclog.Errorf("cannot add a child (id = %d) of type %T to a channel", id, e)
+ }
+}
+
+func (c *channel) deleteChild(id int64) {
+ delete(c.subChans, id)
+ delete(c.nestedChans, id)
+ c.deleteSelfIfReady()
+}
+
+func (c *channel) triggerDelete() {
+ c.closeCalled = true
+ c.deleteSelfIfReady()
+}
+
+func (c *channel) getParentID() int64 {
+ return c.pid
+}
+
+// deleteSelfFromTree tries to delete the channel from the channelz entry relation tree, which means
+// deleting the channel reference from its parent's child list.
+//
+// In order for a channel to be deleted from the tree, it must meet the criteria that, removal of the
+// corresponding grpc object has been invoked, and the channel does not have any children left.
+//
+// The returned boolean value indicates whether the channel has been successfully deleted from tree.
+func (c *channel) deleteSelfFromTree() (deleted bool) {
+ if !c.closeCalled || len(c.subChans)+len(c.nestedChans) != 0 {
+ return false
+ }
+ // not top channel
+ if c.pid != 0 {
+ c.cm.findEntry(c.pid).deleteChild(c.id)
+ }
+ return true
+}
+
+// deleteSelfFromMap checks whether it is valid to delete the channel from the map, which means
+// deleting the channel from channelz's tracking entirely. Users can no longer use id to query the
+// channel, and its memory will be garbage collected.
+//
+// The trace reference count of the channel must be 0 in order to be deleted from the map. This is
+// specified in the channel tracing gRFC that as long as some other trace has reference to an entity,
+// the trace of the referenced entity must not be deleted. In order to release the resource allocated
+// by grpc, the reference to the grpc object is reset to a dummy object.
+//
+// deleteSelfFromMap must be called after deleteSelfFromTree returns true.
+//
+// It returns a bool to indicate whether the channel can be safely deleted from map.
+func (c *channel) deleteSelfFromMap() (delete bool) {
+ if c.getTraceRefCount() != 0 {
+ c.c = &dummyChannel{}
+ return false
+ }
+ return true
+}
+
+// deleteSelfIfReady tries to delete the channel itself from the channelz database.
+// The delete process includes two steps:
+// 1. delete the channel from the entry relation tree, i.e. delete the channel reference from its
+// parent's child list.
+// 2. delete the channel from the map, i.e. delete the channel entirely from channelz. Lookup by id
+// will return entry not found error.
+func (c *channel) deleteSelfIfReady() {
+ if !c.deleteSelfFromTree() {
+ return
+ }
+ if !c.deleteSelfFromMap() {
+ return
+ }
+ c.cm.deleteEntry(c.id)
+ c.trace.clear()
+}
+
+func (c *channel) getChannelTrace() *channelTrace {
+ return c.trace
+}
+
+func (c *channel) incrTraceRefCount() {
+ atomic.AddInt32(&c.traceRefCount, 1)
+}
+
+func (c *channel) decrTraceRefCount() {
+ atomic.AddInt32(&c.traceRefCount, -1)
+}
+
+func (c *channel) getTraceRefCount() int {
+ i := atomic.LoadInt32(&c.traceRefCount)
+ return int(i)
+}
+
+func (c *channel) getRefName() string {
+ return c.refName
+}
+
+type subChannel struct {
+ refName string
+ c Channel
+ closeCalled bool
+ sockets map[int64]string
+ id int64
+ pid int64
+ cm *channelMap
+ trace *channelTrace
+ traceRefCount int32
+}
+
+func (sc *subChannel) addChild(id int64, e entry) {
+ if v, ok := e.(*normalSocket); ok {
+ sc.sockets[id] = v.refName
+ } else {
+ grpclog.Errorf("cannot add a child (id = %d) of type %T to a subChannel", id, e)
+ }
+}
+
+func (sc *subChannel) deleteChild(id int64) {
+ delete(sc.sockets, id)
+ sc.deleteSelfIfReady()
+}
+
+func (sc *subChannel) triggerDelete() {
+ sc.closeCalled = true
+ sc.deleteSelfIfReady()
+}
+
+func (sc *subChannel) getParentID() int64 {
+ return sc.pid
+}
+
+// deleteSelfFromTree tries to delete the subchannel from the channelz entry relation tree, which
+// means deleting the subchannel reference from its parent's child list.
+//
+// In order for a subchannel to be deleted from the tree, it must meet the criteria that, removal of
+// the corresponding grpc object has been invoked, and the subchannel does not have any children left.
+//
+// The returned boolean value indicates whether the channel has been successfully deleted from tree.
+func (sc *subChannel) deleteSelfFromTree() (deleted bool) {
+ if !sc.closeCalled || len(sc.sockets) != 0 {
+ return false
+ }
+ sc.cm.findEntry(sc.pid).deleteChild(sc.id)
+ return true
+}
+
+// deleteSelfFromMap checks whether it is valid to delete the subchannel from the map, which means
+// deleting the subchannel from channelz's tracking entirely. Users can no longer use id to query
+// the subchannel, and its memory will be garbage collected.
+//
+// The trace reference count of the subchannel must be 0 in order to be deleted from the map. This is
+// specified in the channel tracing gRFC that as long as some other trace has reference to an entity,
+// the trace of the referenced entity must not be deleted. In order to release the resource allocated
+// by grpc, the reference to the grpc object is reset to a dummy object.
+//
+// deleteSelfFromMap must be called after deleteSelfFromTree returns true.
+//
+// It returns a bool to indicate whether the channel can be safely deleted from map.
+func (sc *subChannel) deleteSelfFromMap() (delete bool) {
+ if sc.getTraceRefCount() != 0 {
+ // free the grpc struct (i.e. addrConn)
+ sc.c = &dummyChannel{}
+ return false
+ }
+ return true
+}
+
+// deleteSelfIfReady tries to delete the subchannel itself from the channelz database.
+// The delete process includes two steps:
+// 1. delete the subchannel from the entry relation tree, i.e. delete the subchannel reference from
+// its parent's child list.
+// 2. delete the subchannel from the map, i.e. delete the subchannel entirely from channelz. Lookup
+// by id will return entry not found error.
+func (sc *subChannel) deleteSelfIfReady() {
+ if !sc.deleteSelfFromTree() {
+ return
+ }
+ if !sc.deleteSelfFromMap() {
+ return
+ }
+ sc.cm.deleteEntry(sc.id)
+ sc.trace.clear()
+}
+
+func (sc *subChannel) getChannelTrace() *channelTrace {
+ return sc.trace
+}
+
+func (sc *subChannel) incrTraceRefCount() {
+ atomic.AddInt32(&sc.traceRefCount, 1)
+}
+
+func (sc *subChannel) decrTraceRefCount() {
+ atomic.AddInt32(&sc.traceRefCount, -1)
+}
+
+func (sc *subChannel) getTraceRefCount() int {
+ i := atomic.LoadInt32(&sc.traceRefCount)
+ return int(i)
+}
+
+func (sc *subChannel) getRefName() string {
+ return sc.refName
+}
+
+// SocketMetric defines the info channelz provides for a specific Socket, which
+// includes SocketInternalMetric and channelz-specific data, such as channelz id, etc.
+type SocketMetric struct {
+ // ID is the channelz id of this socket.
+ ID int64
+ // RefName is the human readable reference string of this socket.
+ RefName string
+ // SocketData contains socket internal metric reported by the socket through
+ // ChannelzMetric().
+ SocketData *SocketInternalMetric
+}
+
+// SocketInternalMetric defines the struct that the implementor of Socket interface
+// should return from ChannelzMetric().
+type SocketInternalMetric struct {
+ // The number of streams that have been started.
+ StreamsStarted int64
+ // The number of streams that have ended successfully:
+ // On client side, receiving frame with eos bit set.
+ // On server side, sending frame with eos bit set.
+ StreamsSucceeded int64
+ // The number of streams that have ended unsuccessfully:
+ // On client side, termination without receiving frame with eos bit set.
+ // On server side, termination without sending frame with eos bit set.
+ StreamsFailed int64
+ // The number of messages successfully sent on this socket.
+ MessagesSent int64
+ MessagesReceived int64
+ // The number of keep alives sent. This is typically implemented with HTTP/2
+ // ping messages.
+ KeepAlivesSent int64
+ // The last time a stream was created by this endpoint. Usually unset for
+ // servers.
+ LastLocalStreamCreatedTimestamp time.Time
+ // The last time a stream was created by the remote endpoint. Usually unset
+ // for clients.
+ LastRemoteStreamCreatedTimestamp time.Time
+ // The last time a message was sent by this endpoint.
+ LastMessageSentTimestamp time.Time
+ // The last time a message was received by this endpoint.
+ LastMessageReceivedTimestamp time.Time
+ // The amount of window, granted to the local endpoint by the remote endpoint.
+ // This may be slightly out of date due to network latency. This does NOT
+ // include stream level or TCP level flow control info.
+ LocalFlowControlWindow int64
+ // The amount of window, granted to the remote endpoint by the local endpoint.
+ // This may be slightly out of date due to network latency. This does NOT
+ // include stream level or TCP level flow control info.
+ RemoteFlowControlWindow int64
+ // The locally bound address.
+ LocalAddr net.Addr
+ // The remote bound address. May be absent.
+ RemoteAddr net.Addr
+ // Optional, represents the name of the remote endpoint, if different than
+ // the original target name.
+ RemoteName string
+ SocketOptions *SocketOptionData
+ Security credentials.ChannelzSecurityValue
+}
+
+// Socket is the interface that should be satisfied in order to be tracked by
+// channelz as Socket.
+type Socket interface {
+ ChannelzMetric() *SocketInternalMetric
+}
+
+type listenSocket struct {
+ refName string
+ s Socket
+ id int64
+ pid int64
+ cm *channelMap
+}
+
+func (ls *listenSocket) addChild(id int64, e entry) {
+ grpclog.Errorf("cannot add a child (id = %d) of type %T to a listen socket", id, e)
+}
+
+func (ls *listenSocket) deleteChild(id int64) {
+ grpclog.Errorf("cannot delete a child (id = %d) from a listen socket", id)
+}
+
+func (ls *listenSocket) triggerDelete() {
+ ls.cm.deleteEntry(ls.id)
+ ls.cm.findEntry(ls.pid).deleteChild(ls.id)
+}
+
+func (ls *listenSocket) deleteSelfIfReady() {
+ grpclog.Errorf("cannot call deleteSelfIfReady on a listen socket")
+}
+
+func (ls *listenSocket) getParentID() int64 {
+ return ls.pid
+}
+
+type normalSocket struct {
+ refName string
+ s Socket
+ id int64
+ pid int64
+ cm *channelMap
+}
+
+func (ns *normalSocket) addChild(id int64, e entry) {
+ grpclog.Errorf("cannot add a child (id = %d) of type %T to a normal socket", id, e)
+}
+
+func (ns *normalSocket) deleteChild(id int64) {
+ grpclog.Errorf("cannot delete a child (id = %d) from a normal socket", id)
+}
+
+func (ns *normalSocket) triggerDelete() {
+ ns.cm.deleteEntry(ns.id)
+ ns.cm.findEntry(ns.pid).deleteChild(ns.id)
+}
+
+func (ns *normalSocket) deleteSelfIfReady() {
+ grpclog.Errorf("cannot call deleteSelfIfReady on a normal socket")
+}
+
+func (ns *normalSocket) getParentID() int64 {
+ return ns.pid
+}
+
+// ServerMetric defines the info channelz provides for a specific Server, which
+// includes ServerInternalMetric and channelz-specific data, such as channelz id,
+// child list, etc.
+type ServerMetric struct {
+ // ID is the channelz id of this server.
+ ID int64
+ // RefName is the human readable reference string of this server.
+ RefName string
+ // ServerData contains server internal metric reported by the server through
+ // ChannelzMetric().
+ ServerData *ServerInternalMetric
+ // ListenSockets tracks the listener socket type children of this server in the
+ // format of a map from socket channelz id to corresponding reference string.
+ ListenSockets map[int64]string
+}
+
+// ServerInternalMetric defines the struct that the implementor of Server interface
+// should return from ChannelzMetric().
+type ServerInternalMetric struct {
+ // The number of incoming calls started on the server.
+ CallsStarted int64
+ // The number of incoming calls that have completed with an OK status.
+ CallsSucceeded int64
+ // The number of incoming calls that have a completed with a non-OK status.
+ CallsFailed int64
+ // The last time a call was started on the server.
+ LastCallStartedTimestamp time.Time
+}
+
+// Server is the interface to be satisfied in order to be tracked by channelz as
+// Server.
+type Server interface {
+ ChannelzMetric() *ServerInternalMetric
+}
+
+type server struct {
+ refName string
+ s Server
+ closeCalled bool
+ sockets map[int64]string
+ listenSockets map[int64]string
+ id int64
+ cm *channelMap
+}
+
+func (s *server) addChild(id int64, e entry) {
+ switch v := e.(type) {
+ case *normalSocket:
+ s.sockets[id] = v.refName
+ case *listenSocket:
+ s.listenSockets[id] = v.refName
+ default:
+ grpclog.Errorf("cannot add a child (id = %d) of type %T to a server", id, e)
+ }
+}
+
+func (s *server) deleteChild(id int64) {
+ delete(s.sockets, id)
+ delete(s.listenSockets, id)
+ s.deleteSelfIfReady()
+}
+
+func (s *server) triggerDelete() {
+ s.closeCalled = true
+ s.deleteSelfIfReady()
+}
+
+func (s *server) deleteSelfIfReady() {
+ if !s.closeCalled || len(s.sockets)+len(s.listenSockets) != 0 {
+ return
+ }
+ s.cm.deleteEntry(s.id)
+}
+
+func (s *server) getParentID() int64 {
+ return 0
+}
+
+type tracedChannel interface {
+ getChannelTrace() *channelTrace
+ incrTraceRefCount()
+ decrTraceRefCount()
+ getRefName() string
+}
+
+type channelTrace struct {
+ cm *channelMap
+ createdTime time.Time
+ eventCount int64
+ mu sync.Mutex
+ events []*TraceEvent
+}
+
+func (c *channelTrace) append(e *TraceEvent) {
+ c.mu.Lock()
+ if len(c.events) == getMaxTraceEntry() {
+ del := c.events[0]
+ c.events = c.events[1:]
+ if del.RefID != 0 {
+ // start recursive cleanup in a goroutine to not block the call originated from grpc.
+ go func() {
+ // need to acquire c.cm.mu lock to call the unlocked attemptCleanup func.
+ c.cm.mu.Lock()
+ c.cm.decrTraceRefCount(del.RefID)
+ c.cm.mu.Unlock()
+ }()
+ }
+ }
+ e.Timestamp = time.Now()
+ c.events = append(c.events, e)
+ c.eventCount++
+ c.mu.Unlock()
+}
+
+func (c *channelTrace) clear() {
+ c.mu.Lock()
+ for _, e := range c.events {
+ if e.RefID != 0 {
+ // caller should have already held the c.cm.mu lock.
+ c.cm.decrTraceRefCount(e.RefID)
+ }
+ }
+ c.mu.Unlock()
+}
+
+// Severity is the severity level of a trace event.
+// The canonical enumeration of all valid values is here:
+// https://github.com/grpc/grpc-proto/blob/9b13d199cc0d4703c7ea26c9c330ba695866eb23/grpc/channelz/v1/channelz.proto#L126.
+type Severity int
+
+const (
+ // CtUNKNOWN indicates unknown severity of a trace event.
+ CtUNKNOWN Severity = iota
+ // CtINFO indicates info level severity of a trace event.
+ CtINFO
+ // CtWarning indicates warning level severity of a trace event.
+ CtWarning
+ // CtError indicates error level severity of a trace event.
+ CtError
+)
+
+// RefChannelType is the type of the entity being referenced in a trace event.
+type RefChannelType int
+
+const (
+ // RefChannel indicates the referenced entity is a Channel.
+ RefChannel RefChannelType = iota
+ // RefSubChannel indicates the referenced entity is a SubChannel.
+ RefSubChannel
+)
+
+func (c *channelTrace) dumpData() *ChannelTrace {
+ c.mu.Lock()
+ ct := &ChannelTrace{EventNum: c.eventCount, CreationTime: c.createdTime}
+ ct.Events = c.events[:len(c.events)]
+ c.mu.Unlock()
+ return ct
+}