ceph-csi/vendor/google.golang.org/grpc/internal/channelz/funcs.go

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/*
*
* 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 defines internal APIs for enabling channelz service, entry
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// registration/deletion, and accessing channelz data. It also defines channelz
// metric struct formats.
package channelz
import (
"sync/atomic"
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"time"
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"google.golang.org/grpc/internal"
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)
var (
// IDGen is the global channelz entity ID generator. It should not be used
// outside this package except by tests.
IDGen IDGenerator
db *channelMap = newChannelMap()
// EntriesPerPage defines the number of channelz entries to be shown on a web page.
EntriesPerPage = 50
curState int32
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)
// TurnOn turns on channelz data collection.
func TurnOn() {
atomic.StoreInt32(&curState, 1)
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}
func init() {
internal.ChannelzTurnOffForTesting = func() {
atomic.StoreInt32(&curState, 0)
}
}
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// IsOn returns whether channelz data collection is on.
func IsOn() bool {
return atomic.LoadInt32(&curState) == 1
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}
// GetTopChannels returns a slice of top channel's ChannelMetric, along with a
// boolean indicating whether there's more top channels to be queried for.
//
// The arg id specifies that only top channel with id at or above it will be
// included in the result. The returned slice is up to a length of the arg
// maxResults or EntriesPerPage if maxResults is zero, and is sorted in ascending
// id order.
func GetTopChannels(id int64, maxResults int) ([]*Channel, bool) {
return db.getTopChannels(id, maxResults)
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}
// GetServers returns a slice of server's ServerMetric, along with a
// boolean indicating whether there's more servers to be queried for.
//
// The arg id specifies that only server with id at or above it will be included
// in the result. The returned slice is up to a length of the arg maxResults or
// EntriesPerPage if maxResults is zero, and is sorted in ascending id order.
func GetServers(id int64, maxResults int) ([]*Server, bool) {
return db.getServers(id, maxResults)
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}
// GetServerSockets returns a slice of server's (identified by id) normal socket's
// SocketMetrics, along with a boolean indicating whether there's more sockets to
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// be queried for.
//
// The arg startID specifies that only sockets with id at or above it will be
// included in the result. The returned slice is up to a length of the arg maxResults
// or EntriesPerPage if maxResults is zero, and is sorted in ascending id order.
func GetServerSockets(id int64, startID int64, maxResults int) ([]*Socket, bool) {
return db.getServerSockets(id, startID, maxResults)
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}
// GetChannel returns the Channel for the channel (identified by id).
func GetChannel(id int64) *Channel {
return db.getChannel(id)
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}
// GetSubChannel returns the SubChannel for the subchannel (identified by id).
func GetSubChannel(id int64) *SubChannel {
return db.getSubChannel(id)
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}
// GetSocket returns the Socket for the socket (identified by id).
func GetSocket(id int64) *Socket {
return db.getSocket(id)
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}
// GetServer returns the ServerMetric for the server (identified by id).
func GetServer(id int64) *Server {
return db.getServer(id)
}
// RegisterChannel registers the given channel c in the channelz database with
// target as its target and reference name, and adds it to the child list of its
// parent. parent == nil means no parent.
//
// Returns a unique channelz identifier assigned to this channel.
//
// If channelz is not turned ON, the channelz database is not mutated.
func RegisterChannel(parent *Channel, target string) *Channel {
id := IDGen.genID()
if !IsOn() {
return &Channel{ID: id}
}
isTopChannel := parent == nil
cn := &Channel{
ID: id,
RefName: target,
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nestedChans: make(map[int64]string),
subChans: make(map[int64]string),
Parent: parent,
trace: &ChannelTrace{CreationTime: time.Now(), Events: make([]*traceEvent, 0, getMaxTraceEntry())},
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}
cn.ChannelMetrics.Target.Store(&target)
db.addChannel(id, cn, isTopChannel, cn.getParentID())
return cn
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}
// RegisterSubChannel registers the given subChannel c in the channelz database
// with ref as its reference name, and adds it to the child list of its parent
// (identified by pid).
//
// Returns a unique channelz identifier assigned to this subChannel.
//
// If channelz is not turned ON, the channelz database is not mutated.
func RegisterSubChannel(parent *Channel, ref string) *SubChannel {
id := IDGen.genID()
sc := &SubChannel{
ID: id,
RefName: ref,
parent: parent,
}
if !IsOn() {
return sc
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}
sc.sockets = make(map[int64]string)
sc.trace = &ChannelTrace{CreationTime: time.Now(), Events: make([]*traceEvent, 0, getMaxTraceEntry())}
db.addSubChannel(id, sc, parent.ID)
return sc
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}
// RegisterServer registers the given server s in channelz database. It returns
// the unique channelz tracking id assigned to this server.
//
// If channelz is not turned ON, the channelz database is not mutated.
func RegisterServer(ref string) *Server {
id := IDGen.genID()
if !IsOn() {
return &Server{ID: id}
}
svr := &Server{
RefName: ref,
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sockets: make(map[int64]string),
listenSockets: make(map[int64]string),
ID: id,
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}
db.addServer(id, svr)
return svr
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}
// RegisterSocket registers the given normal socket s in channelz database
// with ref as its reference name, and adds it to the child list of its parent
// (identified by skt.Parent, which must be set). It returns the unique channelz
// tracking id assigned to this normal socket.
//
// If channelz is not turned ON, the channelz database is not mutated.
func RegisterSocket(skt *Socket) *Socket {
skt.ID = IDGen.genID()
if IsOn() {
db.addSocket(skt)
}
return skt
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}
// RemoveEntry removes an entry with unique channelz tracking id to be id from
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// channelz database.
//
// If channelz is not turned ON, this function is a no-op.
func RemoveEntry(id int64) {
if !IsOn() {
return
}
db.removeEntry(id)
}
// IDGenerator is an incrementing atomic that tracks IDs for channelz entities.
type IDGenerator struct {
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id int64
}
// Reset resets the generated ID back to zero. Should only be used at
// initialization or by tests sensitive to the ID number.
func (i *IDGenerator) Reset() {
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atomic.StoreInt64(&i.id, 0)
}
func (i *IDGenerator) genID() int64 {
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return atomic.AddInt64(&i.id, 1)
}
// Identifier is an opaque channelz identifier used to expose channelz symbols
// outside of grpc. Currently only implemented by Channel since no other
// types require exposure outside grpc.
type Identifier interface {
Entity
channelzIdentifier()
}