go.etcd.io/etcd@v3.3.27+incompatible/clientv3/balancer/picker/err.go (about)

     1  // Copyright 2018 The etcd Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package picker
    16  
    17  import (
    18  	"context"
    19  
    20  	"google.golang.org/grpc/balancer"
    21  )
    22  
    23  // NewErr returns a picker that always returns err on "Pick".
    24  func NewErr(err error) Picker {
    25  	return &errPicker{p: Error, err: err}
    26  }
    27  
    28  type errPicker struct {
    29  	p   Policy
    30  	err error
    31  }
    32  
    33  func (ep *errPicker) String() string {
    34  	return ep.p.String()
    35  }
    36  
    37  func (ep *errPicker) Pick(context.Context, balancer.PickOptions) (balancer.SubConn, func(balancer.DoneInfo), error) {
    38  	return nil, nil, ep.err
    39  }