e6549e636d
WithBalancerName dial option specifies the name of the balancer to be used by the ClientConn. Service config updates can NOT override the balancer option.
109 lines
2.8 KiB
Go
109 lines
2.8 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 grpc
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import (
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"golang.org/x/net/context"
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"google.golang.org/grpc/balancer"
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"google.golang.org/grpc/connectivity"
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"google.golang.org/grpc/grpclog"
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"google.golang.org/grpc/resolver"
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)
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// PickFirstBalancerName is the name of the pick_first balancer.
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const PickFirstBalancerName = "pick_first"
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func newPickfirstBuilder() balancer.Builder {
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return &pickfirstBuilder{}
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}
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type pickfirstBuilder struct{}
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func (*pickfirstBuilder) Build(cc balancer.ClientConn, opt balancer.BuildOptions) balancer.Balancer {
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return &pickfirstBalancer{cc: cc}
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}
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func (*pickfirstBuilder) Name() string {
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return PickFirstBalancerName
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}
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type pickfirstBalancer struct {
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cc balancer.ClientConn
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sc balancer.SubConn
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}
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func (b *pickfirstBalancer) HandleResolvedAddrs(addrs []resolver.Address, err error) {
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if err != nil {
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grpclog.Infof("pickfirstBalancer: HandleResolvedAddrs called with error %v", err)
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return
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}
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if b.sc == nil {
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b.sc, err = b.cc.NewSubConn(addrs, balancer.NewSubConnOptions{})
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if err != nil {
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grpclog.Errorf("pickfirstBalancer: failed to NewSubConn: %v", err)
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return
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}
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b.cc.UpdateBalancerState(connectivity.Idle, &picker{sc: b.sc})
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b.sc.Connect()
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} else {
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b.sc.UpdateAddresses(addrs)
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b.sc.Connect()
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}
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}
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func (b *pickfirstBalancer) HandleSubConnStateChange(sc balancer.SubConn, s connectivity.State) {
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grpclog.Infof("pickfirstBalancer: HandleSubConnStateChange: %p, %v", sc, s)
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if b.sc != sc {
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grpclog.Infof("pickfirstBalancer: ignored state change because sc is not recognized")
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return
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}
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if s == connectivity.Shutdown {
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b.sc = nil
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return
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}
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switch s {
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case connectivity.Ready, connectivity.Idle:
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b.cc.UpdateBalancerState(s, &picker{sc: sc})
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case connectivity.Connecting:
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b.cc.UpdateBalancerState(s, &picker{err: balancer.ErrNoSubConnAvailable})
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case connectivity.TransientFailure:
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b.cc.UpdateBalancerState(s, &picker{err: balancer.ErrTransientFailure})
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}
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}
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func (b *pickfirstBalancer) Close() {
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}
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type picker struct {
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err error
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sc balancer.SubConn
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}
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func (p *picker) Pick(ctx context.Context, opts balancer.PickOptions) (balancer.SubConn, func(balancer.DoneInfo), error) {
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if p.err != nil {
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return nil, nil, p.err
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}
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return p.sc, nil, nil
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}
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func init() {
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balancer.Register(newPickfirstBuilder())
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}
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