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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 roundrobin defines a roundrobin balancer. Roundrobin balancer is
// installed as one of the default balancers in gRPC, users don't need to
// explicitly install this balancer.
package roundrobin
import (
"fmt"
"google.golang.org/grpc/balancer"
"google.golang.org/grpc/balancer/endpointsharding"
"google.golang.org/grpc/balancer/pickfirst/pickfirstleaf"
"google.golang.org/grpc/grpclog"
internalgrpclog "google.golang.org/grpc/internal/grpclog"
)
// Name is the name of round_robin balancer.
const Name = "round_robin"
var logger = grpclog.Component("roundrobin")
func init() {
balancer.Register(builder{})
}
type builder struct{}
func (bb builder) Name() string {
return Name
}
func (bb builder) Build(cc balancer.ClientConn, opts balancer.BuildOptions) balancer.Balancer {
childBuilder := balancer.Get(pickfirstleaf.Name).Build
bal := &rrBalancer{
cc: cc,
Balancer: endpointsharding.NewBalancer(cc, opts, childBuilder, endpointsharding.Options{}),
}
bal.logger = internalgrpclog.NewPrefixLogger(logger, fmt.Sprintf("[%p] ", bal))
bal.logger.Infof("Created")
return bal
}
type rrBalancer struct {
balancer.Balancer
cc balancer.ClientConn
logger *internalgrpclog.PrefixLogger
}
func (b *rrBalancer) UpdateClientConnState(ccs balancer.ClientConnState) error {
return b.Balancer.UpdateClientConnState(balancer.ClientConnState{
// Enable the health listener in pickfirst children for client side health
// checks and outlier detection, if configured.
ResolverState: pickfirstleaf.EnableHealthListener(ccs.ResolverState),
})
}
func (b *rrBalancer) ExitIdle() {
// Should always be ok, as child is endpoint sharding.
if ei, ok := b.Balancer.(balancer.ExitIdler); ok {
ei.ExitIdle()
}
}
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