forked from toolshed/abra
73 lines
2.1 KiB
Go
73 lines
2.1 KiB
Go
/*
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*
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* Copyright 2017 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 roundrobin defines a roundrobin balancer. Roundrobin balancer is
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// installed as one of the default balancers in gRPC, users don't need to
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// explicitly install this balancer.
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package roundrobin
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import (
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"fmt"
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"google.golang.org/grpc/balancer"
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"google.golang.org/grpc/balancer/endpointsharding"
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"google.golang.org/grpc/balancer/pickfirst/pickfirstleaf"
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"google.golang.org/grpc/grpclog"
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internalgrpclog "google.golang.org/grpc/internal/grpclog"
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)
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// Name is the name of round_robin balancer.
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const Name = "round_robin"
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var logger = grpclog.Component("roundrobin")
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func init() {
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balancer.Register(builder{})
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}
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type builder struct{}
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func (bb builder) Name() string {
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return Name
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}
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func (bb builder) Build(cc balancer.ClientConn, opts balancer.BuildOptions) balancer.Balancer {
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childBuilder := balancer.Get(pickfirstleaf.Name).Build
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bal := &rrBalancer{
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cc: cc,
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Balancer: endpointsharding.NewBalancer(cc, opts, childBuilder, endpointsharding.Options{}),
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}
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bal.logger = internalgrpclog.NewPrefixLogger(logger, fmt.Sprintf("[%p] ", bal))
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bal.logger.Infof("Created")
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return bal
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}
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type rrBalancer struct {
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balancer.Balancer
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cc balancer.ClientConn
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logger *internalgrpclog.PrefixLogger
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}
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func (b *rrBalancer) UpdateClientConnState(ccs balancer.ClientConnState) error {
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return b.Balancer.UpdateClientConnState(balancer.ClientConnState{
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// Enable the health listener in pickfirst children for client side health
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// checks and outlier detection, if configured.
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ResolverState: pickfirstleaf.EnableHealthListener(ccs.ResolverState),
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})
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}
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