mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-19 11:30:24 +00:00
92 lines
2.2 KiB
Go
92 lines
2.2 KiB
Go
// Copyright 2018 The etcd 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 picker
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"go.uber.org/zap"
|
|
"google.golang.org/grpc/balancer"
|
|
"google.golang.org/grpc/resolver"
|
|
)
|
|
|
|
// Picker defines balancer Picker methods.
|
|
type Picker interface {
|
|
balancer.Picker
|
|
String() string
|
|
}
|
|
|
|
// Config defines picker configuration.
|
|
type Config struct {
|
|
// Policy specifies etcd clientv3's built in balancer policy.
|
|
Policy Policy
|
|
|
|
// Logger defines picker logging object.
|
|
Logger *zap.Logger
|
|
|
|
// SubConnToResolverAddress maps each gRPC sub-connection to an address.
|
|
// Basically, it is a list of addresses that the Picker can pick from.
|
|
SubConnToResolverAddress map[balancer.SubConn]resolver.Address
|
|
}
|
|
|
|
// Policy defines balancer picker policy.
|
|
type Policy uint8
|
|
|
|
const (
|
|
// Error is error picker policy.
|
|
Error Policy = iota
|
|
|
|
// RoundrobinBalanced balances loads over multiple endpoints
|
|
// and implements failover in roundrobin fashion.
|
|
RoundrobinBalanced
|
|
|
|
// Custom defines custom balancer picker.
|
|
// TODO: custom picker is not supported yet.
|
|
Custom
|
|
)
|
|
|
|
func (p Policy) String() string {
|
|
switch p {
|
|
case Error:
|
|
return "picker-error"
|
|
|
|
case RoundrobinBalanced:
|
|
return "picker-roundrobin-balanced"
|
|
|
|
case Custom:
|
|
panic("'custom' picker policy is not supported yet")
|
|
|
|
default:
|
|
panic(fmt.Errorf("invalid balancer picker policy (%d)", p))
|
|
}
|
|
}
|
|
|
|
// New creates a new Picker.
|
|
func New(cfg Config) Picker {
|
|
switch cfg.Policy {
|
|
case Error:
|
|
panic("'error' picker policy is not supported here; use 'picker.NewErr'")
|
|
|
|
case RoundrobinBalanced:
|
|
return newRoundrobinBalanced(cfg)
|
|
|
|
case Custom:
|
|
panic("'custom' picker policy is not supported yet")
|
|
|
|
default:
|
|
panic(fmt.Errorf("invalid balancer picker policy (%d)", cfg.Policy))
|
|
}
|
|
}
|