DockerCLI/vendor/google.golang.org/grpc/balancer_conn_wrappers.go

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/*
*
* Copyright 2017 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 grpc
import (
"fmt"
"sync"
"google.golang.org/grpc/balancer"
"google.golang.org/grpc/connectivity"
"google.golang.org/grpc/internal/buffer"
"google.golang.org/grpc/internal/channelz"
"google.golang.org/grpc/internal/grpcsync"
"google.golang.org/grpc/resolver"
)
// scStateUpdate contains the subConn and the new state it changed to.
type scStateUpdate struct {
sc balancer.SubConn
state connectivity.State
err error
}
// exitIdle contains no data and is just a signal sent on the updateCh in
// ccBalancerWrapper to instruct the balancer to exit idle.
type exitIdle struct{}
// ccBalancerWrapper is a wrapper on top of cc for balancers.
// It implements balancer.ClientConn interface.
type ccBalancerWrapper struct {
cc *ClientConn
balancerMu sync.Mutex // synchronizes calls to the balancer
balancer balancer.Balancer
hasExitIdle bool
updateCh *buffer.Unbounded
closed *grpcsync.Event
done *grpcsync.Event
mu sync.Mutex
subConns map[*acBalancerWrapper]struct{}
}
func newCCBalancerWrapper(cc *ClientConn, b balancer.Builder, bopts balancer.BuildOptions) *ccBalancerWrapper {
ccb := &ccBalancerWrapper{
cc: cc,
updateCh: buffer.NewUnbounded(),
closed: grpcsync.NewEvent(),
done: grpcsync.NewEvent(),
subConns: make(map[*acBalancerWrapper]struct{}),
}
go ccb.watcher()
ccb.balancer = b.Build(ccb, bopts)
_, ccb.hasExitIdle = ccb.balancer.(balancer.ExitIdler)
return ccb
}
// watcher balancer functions sequentially, so the balancer can be implemented
// lock-free.
func (ccb *ccBalancerWrapper) watcher() {
for {
select {
case t := <-ccb.updateCh.Get():
ccb.updateCh.Load()
if ccb.closed.HasFired() {
break
}
switch u := t.(type) {
case *scStateUpdate:
ccb.balancerMu.Lock()
ccb.balancer.UpdateSubConnState(u.sc, balancer.SubConnState{ConnectivityState: u.state, ConnectionError: u.err})
ccb.balancerMu.Unlock()
case *acBalancerWrapper:
ccb.mu.Lock()
if ccb.subConns != nil {
delete(ccb.subConns, u)
ccb.cc.removeAddrConn(u.getAddrConn(), errConnDrain)
}
ccb.mu.Unlock()
case exitIdle:
if ccb.cc.GetState() == connectivity.Idle {
if ei, ok := ccb.balancer.(balancer.ExitIdler); ok {
// We already checked that the balancer implements
// ExitIdle before pushing the event to updateCh, but
// check conditionally again as defensive programming.
ccb.balancerMu.Lock()
ei.ExitIdle()
ccb.balancerMu.Unlock()
}
}
default:
logger.Errorf("ccBalancerWrapper.watcher: unknown update %+v, type %T", t, t)
}
case <-ccb.closed.Done():
}
if ccb.closed.HasFired() {
ccb.balancerMu.Lock()
ccb.balancer.Close()
ccb.balancerMu.Unlock()
ccb.mu.Lock()
scs := ccb.subConns
ccb.subConns = nil
ccb.mu.Unlock()
ccb.UpdateState(balancer.State{ConnectivityState: connectivity.Connecting, Picker: nil})
ccb.done.Fire()
// Fire done before removing the addr conns. We can safely unblock
// ccb.close and allow the removeAddrConns to happen
// asynchronously.
for acbw := range scs {
ccb.cc.removeAddrConn(acbw.getAddrConn(), errConnDrain)
}
return
}
}
}
func (ccb *ccBalancerWrapper) close() {
ccb.closed.Fire()
<-ccb.done.Done()
}
func (ccb *ccBalancerWrapper) exitIdle() bool {
if !ccb.hasExitIdle {
return false
}
ccb.updateCh.Put(exitIdle{})
return true
}
func (ccb *ccBalancerWrapper) handleSubConnStateChange(sc balancer.SubConn, s connectivity.State, err error) {
// When updating addresses for a SubConn, if the address in use is not in
// the new addresses, the old ac will be tearDown() and a new ac will be
// created. tearDown() generates a state change with Shutdown state, we
// don't want the balancer to receive this state change. So before
// tearDown() on the old ac, ac.acbw (acWrapper) will be set to nil, and
// this function will be called with (nil, Shutdown). We don't need to call
// balancer method in this case.
if sc == nil {
return
}
ccb.updateCh.Put(&scStateUpdate{
sc: sc,
state: s,
err: err,
})
}
func (ccb *ccBalancerWrapper) updateClientConnState(ccs *balancer.ClientConnState) error {
ccb.balancerMu.Lock()
defer ccb.balancerMu.Unlock()
return ccb.balancer.UpdateClientConnState(*ccs)
}
func (ccb *ccBalancerWrapper) resolverError(err error) {
ccb.balancerMu.Lock()
defer ccb.balancerMu.Unlock()
ccb.balancer.ResolverError(err)
}
func (ccb *ccBalancerWrapper) NewSubConn(addrs []resolver.Address, opts balancer.NewSubConnOptions) (balancer.SubConn, error) {
if len(addrs) <= 0 {
return nil, fmt.Errorf("grpc: cannot create SubConn with empty address list")
}
ccb.mu.Lock()
defer ccb.mu.Unlock()
if ccb.subConns == nil {
return nil, fmt.Errorf("grpc: ClientConn balancer wrapper was closed")
}
ac, err := ccb.cc.newAddrConn(addrs, opts)
if err != nil {
return nil, err
}
acbw := &acBalancerWrapper{ac: ac}
acbw.ac.mu.Lock()
ac.acbw = acbw
acbw.ac.mu.Unlock()
ccb.subConns[acbw] = struct{}{}
return acbw, nil
}
func (ccb *ccBalancerWrapper) RemoveSubConn(sc balancer.SubConn) {
// The RemoveSubConn() is handled in the run() goroutine, to avoid deadlock
// during switchBalancer() if the old balancer calls RemoveSubConn() in its
// Close().
ccb.updateCh.Put(sc)
}
func (ccb *ccBalancerWrapper) UpdateAddresses(sc balancer.SubConn, addrs []resolver.Address) {
acbw, ok := sc.(*acBalancerWrapper)
if !ok {
return
}
acbw.UpdateAddresses(addrs)
}
func (ccb *ccBalancerWrapper) UpdateState(s balancer.State) {
ccb.mu.Lock()
defer ccb.mu.Unlock()
if ccb.subConns == nil {
return
}
// Update picker before updating state. Even though the ordering here does
// not matter, it can lead to multiple calls of Pick in the common start-up
// case where we wait for ready and then perform an RPC. If the picker is
// updated later, we could call the "connecting" picker when the state is
// updated, and then call the "ready" picker after the picker gets updated.
ccb.cc.blockingpicker.updatePicker(s.Picker)
ccb.cc.csMgr.updateState(s.ConnectivityState)
}
func (ccb *ccBalancerWrapper) ResolveNow(o resolver.ResolveNowOptions) {
ccb.cc.resolveNow(o)
}
func (ccb *ccBalancerWrapper) Target() string {
return ccb.cc.target
}
// acBalancerWrapper is a wrapper on top of ac for balancers.
// It implements balancer.SubConn interface.
type acBalancerWrapper struct {
mu sync.Mutex
ac *addrConn
}
func (acbw *acBalancerWrapper) UpdateAddresses(addrs []resolver.Address) {
acbw.mu.Lock()
defer acbw.mu.Unlock()
if len(addrs) <= 0 {
acbw.ac.cc.removeAddrConn(acbw.ac, errConnDrain)
return
}
if !acbw.ac.tryUpdateAddrs(addrs) {
cc := acbw.ac.cc
opts := acbw.ac.scopts
acbw.ac.mu.Lock()
// Set old ac.acbw to nil so the Shutdown state update will be ignored
// by balancer.
//
// TODO(bar) the state transition could be wrong when tearDown() old ac
// and creating new ac, fix the transition.
acbw.ac.acbw = nil
acbw.ac.mu.Unlock()
acState := acbw.ac.getState()
acbw.ac.cc.removeAddrConn(acbw.ac, errConnDrain)
if acState == connectivity.Shutdown {
return
}
newAC, err := cc.newAddrConn(addrs, opts)
if err != nil {
channelz.Warningf(logger, acbw.ac.channelzID, "acBalancerWrapper: UpdateAddresses: failed to newAddrConn: %v", err)
return
}
acbw.ac = newAC
newAC.mu.Lock()
newAC.acbw = acbw
newAC.mu.Unlock()
if acState != connectivity.Idle {
go newAC.connect()
}
}
}
func (acbw *acBalancerWrapper) Connect() {
acbw.mu.Lock()
defer acbw.mu.Unlock()
go acbw.ac.connect()
}
func (acbw *acBalancerWrapper) getAddrConn() *addrConn {
acbw.mu.Lock()
defer acbw.mu.Unlock()
return acbw.ac
}