mirror of https://github.com/docker/cli.git
231 lines
6.9 KiB
Go
231 lines
6.9 KiB
Go
/*
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*
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* Copyright 2018 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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// Package channelz defines internal APIs for enabling channelz service, entry
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// registration/deletion, and accessing channelz data. It also defines channelz
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// metric struct formats.
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package channelz
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import (
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"sync/atomic"
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"time"
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"google.golang.org/grpc/internal"
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)
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var (
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// IDGen is the global channelz entity ID generator. It should not be used
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// outside this package except by tests.
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IDGen IDGenerator
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db = newChannelMap()
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// EntriesPerPage defines the number of channelz entries to be shown on a web page.
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EntriesPerPage = 50
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curState int32
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)
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// TurnOn turns on channelz data collection.
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func TurnOn() {
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atomic.StoreInt32(&curState, 1)
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}
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func init() {
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internal.ChannelzTurnOffForTesting = func() {
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atomic.StoreInt32(&curState, 0)
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}
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}
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// IsOn returns whether channelz data collection is on.
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func IsOn() bool {
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return atomic.LoadInt32(&curState) == 1
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}
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// GetTopChannels returns a slice of top channel's ChannelMetric, along with a
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// boolean indicating whether there's more top channels to be queried for.
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//
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// The arg id specifies that only top channel with id at or above it will be
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// included in the result. The returned slice is up to a length of the arg
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// maxResults or EntriesPerPage if maxResults is zero, and is sorted in ascending
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// id order.
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func GetTopChannels(id int64, maxResults int) ([]*Channel, bool) {
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return db.getTopChannels(id, maxResults)
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}
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// GetServers returns a slice of server's ServerMetric, along with a
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// boolean indicating whether there's more servers to be queried for.
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//
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// The arg id specifies that only server with id at or above it will be included
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// in the result. The returned slice is up to a length of the arg maxResults or
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// EntriesPerPage if maxResults is zero, and is sorted in ascending id order.
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func GetServers(id int64, maxResults int) ([]*Server, bool) {
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return db.getServers(id, maxResults)
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}
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// GetServerSockets returns a slice of server's (identified by id) normal socket's
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// SocketMetrics, along with a boolean indicating whether there's more sockets to
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// be queried for.
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//
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// The arg startID specifies that only sockets with id at or above it will be
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// included in the result. The returned slice is up to a length of the arg maxResults
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// or EntriesPerPage if maxResults is zero, and is sorted in ascending id order.
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func GetServerSockets(id int64, startID int64, maxResults int) ([]*Socket, bool) {
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return db.getServerSockets(id, startID, maxResults)
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}
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// GetChannel returns the Channel for the channel (identified by id).
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func GetChannel(id int64) *Channel {
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return db.getChannel(id)
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}
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// GetSubChannel returns the SubChannel for the subchannel (identified by id).
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func GetSubChannel(id int64) *SubChannel {
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return db.getSubChannel(id)
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}
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// GetSocket returns the Socket for the socket (identified by id).
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func GetSocket(id int64) *Socket {
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return db.getSocket(id)
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}
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// GetServer returns the ServerMetric for the server (identified by id).
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func GetServer(id int64) *Server {
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return db.getServer(id)
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}
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// RegisterChannel registers the given channel c in the channelz database with
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// target as its target and reference name, and adds it to the child list of its
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// parent. parent == nil means no parent.
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//
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// Returns a unique channelz identifier assigned to this channel.
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//
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// If channelz is not turned ON, the channelz database is not mutated.
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func RegisterChannel(parent *Channel, target string) *Channel {
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id := IDGen.genID()
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if !IsOn() {
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return &Channel{ID: id}
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}
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isTopChannel := parent == nil
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cn := &Channel{
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ID: id,
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RefName: target,
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nestedChans: make(map[int64]string),
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subChans: make(map[int64]string),
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Parent: parent,
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trace: &ChannelTrace{CreationTime: time.Now(), Events: make([]*traceEvent, 0, getMaxTraceEntry())},
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}
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cn.ChannelMetrics.Target.Store(&target)
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db.addChannel(id, cn, isTopChannel, cn.getParentID())
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return cn
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}
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// RegisterSubChannel registers the given subChannel c in the channelz database
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// with ref as its reference name, and adds it to the child list of its parent
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// (identified by pid).
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//
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// Returns a unique channelz identifier assigned to this subChannel.
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//
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// If channelz is not turned ON, the channelz database is not mutated.
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func RegisterSubChannel(parent *Channel, ref string) *SubChannel {
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id := IDGen.genID()
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sc := &SubChannel{
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ID: id,
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RefName: ref,
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parent: parent,
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}
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if !IsOn() {
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return sc
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}
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sc.sockets = make(map[int64]string)
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sc.trace = &ChannelTrace{CreationTime: time.Now(), Events: make([]*traceEvent, 0, getMaxTraceEntry())}
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db.addSubChannel(id, sc, parent.ID)
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return sc
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}
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// RegisterServer registers the given server s in channelz database. It returns
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// the unique channelz tracking id assigned to this server.
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//
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// If channelz is not turned ON, the channelz database is not mutated.
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func RegisterServer(ref string) *Server {
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id := IDGen.genID()
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if !IsOn() {
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return &Server{ID: id}
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}
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svr := &Server{
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RefName: ref,
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sockets: make(map[int64]string),
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listenSockets: make(map[int64]string),
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ID: id,
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}
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db.addServer(id, svr)
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return svr
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}
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// RegisterSocket registers the given normal socket s in channelz database
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// with ref as its reference name, and adds it to the child list of its parent
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// (identified by skt.Parent, which must be set). It returns the unique channelz
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// tracking id assigned to this normal socket.
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//
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// If channelz is not turned ON, the channelz database is not mutated.
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func RegisterSocket(skt *Socket) *Socket {
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skt.ID = IDGen.genID()
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if IsOn() {
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db.addSocket(skt)
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}
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return skt
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}
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// RemoveEntry removes an entry with unique channelz tracking id to be id from
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// channelz database.
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//
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// If channelz is not turned ON, this function is a no-op.
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func RemoveEntry(id int64) {
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if !IsOn() {
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return
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}
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db.removeEntry(id)
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}
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// IDGenerator is an incrementing atomic that tracks IDs for channelz entities.
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type IDGenerator struct {
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id int64
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}
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// Reset resets the generated ID back to zero. Should only be used at
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// initialization or by tests sensitive to the ID number.
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func (i *IDGenerator) Reset() {
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atomic.StoreInt64(&i.id, 0)
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}
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func (i *IDGenerator) genID() int64 {
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return atomic.AddInt64(&i.id, 1)
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}
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// Identifier is an opaque channelz identifier used to expose channelz symbols
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// outside of grpc. Currently only implemented by Channel since no other
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// types require exposure outside grpc.
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type Identifier interface {
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Entity
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channelzIdentifier()
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}
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