khenaidoo | d948f77 | 2021-08-11 17:49:24 -0400 | [diff] [blame] | 1 | // Copyright 2015 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 api |
| 16 | |
| 17 | import ( |
| 18 | "sync" |
| 19 | |
| 20 | "github.com/coreos/etcd/version" |
| 21 | "github.com/coreos/go-semver/semver" |
| 22 | "github.com/coreos/pkg/capnslog" |
| 23 | ) |
| 24 | |
| 25 | type Capability string |
| 26 | |
| 27 | const ( |
| 28 | AuthCapability Capability = "auth" |
| 29 | V3rpcCapability Capability = "v3rpc" |
| 30 | ) |
| 31 | |
| 32 | var ( |
| 33 | plog = capnslog.NewPackageLogger("github.com/coreos/etcd", "etcdserver/api") |
| 34 | |
| 35 | // capabilityMaps is a static map of version to capability map. |
| 36 | capabilityMaps = map[string]map[Capability]bool{ |
| 37 | "3.0.0": {AuthCapability: true, V3rpcCapability: true}, |
| 38 | "3.1.0": {AuthCapability: true, V3rpcCapability: true}, |
| 39 | "3.2.0": {AuthCapability: true, V3rpcCapability: true}, |
| 40 | "3.3.0": {AuthCapability: true, V3rpcCapability: true}, |
| 41 | } |
| 42 | |
| 43 | enableMapMu sync.RWMutex |
| 44 | // enabledMap points to a map in capabilityMaps |
| 45 | enabledMap map[Capability]bool |
| 46 | |
| 47 | curVersion *semver.Version |
| 48 | ) |
| 49 | |
| 50 | func init() { |
| 51 | enabledMap = map[Capability]bool{ |
| 52 | AuthCapability: true, |
| 53 | V3rpcCapability: true, |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | // UpdateCapability updates the enabledMap when the cluster version increases. |
| 58 | func UpdateCapability(v *semver.Version) { |
| 59 | if v == nil { |
| 60 | // if recovered but version was never set by cluster |
| 61 | return |
| 62 | } |
| 63 | enableMapMu.Lock() |
| 64 | if curVersion != nil && !curVersion.LessThan(*v) { |
| 65 | enableMapMu.Unlock() |
| 66 | return |
| 67 | } |
| 68 | curVersion = v |
| 69 | enabledMap = capabilityMaps[curVersion.String()] |
| 70 | enableMapMu.Unlock() |
| 71 | plog.Infof("enabled capabilities for version %s", version.Cluster(v.String())) |
| 72 | } |
| 73 | |
| 74 | func IsCapabilityEnabled(c Capability) bool { |
| 75 | enableMapMu.RLock() |
| 76 | defer enableMapMu.RUnlock() |
| 77 | if enabledMap == nil { |
| 78 | return false |
| 79 | } |
| 80 | return enabledMap[c] |
| 81 | } |
| 82 | |
| 83 | func EnableCapability(c Capability) { |
| 84 | enableMapMu.Lock() |
| 85 | defer enableMapMu.Unlock() |
| 86 | enabledMap[c] = true |
| 87 | } |