| // 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" |
| |
| // Policy defines balancer picker policy. |
| type Policy uint8 |
| |
| const ( |
| // TODO: custom picker is not supported yet. |
| // custom defines custom balancer picker. |
| custom Policy = iota |
| |
| // RoundrobinBalanced balance loads over multiple endpoints |
| // and implements failover in roundrobin fashion. |
| RoundrobinBalanced Policy = iota |
| |
| // TODO: only send loads to pinned address "RoundrobinFailover" |
| // just like how 3.3 client works |
| // |
| // TODO: priotize leader |
| // TODO: health-check |
| // TODO: weighted roundrobin |
| // TODO: power of two random choice |
| ) |
| |
| func (p Policy) String() string { |
| switch p { |
| case custom: |
| panic("'custom' picker policy is not supported yet") |
| case RoundrobinBalanced: |
| return "etcd-client-roundrobin-balanced" |
| default: |
| panic(fmt.Errorf("invalid balancer picker policy (%d)", p)) |
| } |
| } |