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// Copyright 2015 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 api
import (
"sync"
"go.etcd.io/etcd/api/v3/version"
"go.etcd.io/etcd/server/v3/etcdserver/api/membership"
"go.uber.org/zap"
"github.com/coreos/go-semver/semver"
)
type Capability string
const (
AuthCapability Capability = "auth"
V3rpcCapability Capability = "v3rpc"
)
var (
// capabilityMaps is a static map of version to capability map.
capabilityMaps = map[string]map[Capability]bool{
"3.0.0": {AuthCapability: true, V3rpcCapability: true},
"3.1.0": {AuthCapability: true, V3rpcCapability: true},
"3.2.0": {AuthCapability: true, V3rpcCapability: true},
"3.3.0": {AuthCapability: true, V3rpcCapability: true},
"3.4.0": {AuthCapability: true, V3rpcCapability: true},
"3.5.0": {AuthCapability: true, V3rpcCapability: true},
}
enableMapMu sync.RWMutex
// enabledMap points to a map in capabilityMaps
enabledMap map[Capability]bool
curVersion *semver.Version
)
func init() {
enabledMap = map[Capability]bool{
AuthCapability: true,
V3rpcCapability: true,
}
}
// UpdateCapability updates the enabledMap when the cluster version increases.
func UpdateCapability(lg *zap.Logger, v *semver.Version) {
if v == nil {
// if recovered but version was never set by cluster
return
}
enableMapMu.Lock()
if curVersion != nil && !membership.IsValidVersionChange(v, curVersion) {
enableMapMu.Unlock()
return
}
curVersion = v
enabledMap = capabilityMaps[curVersion.String()]
enableMapMu.Unlock()
if lg != nil {
lg.Info(
"enabled capabilities for version",
zap.String("cluster-version", version.Cluster(v.String())),
)
}
}
func IsCapabilityEnabled(c Capability) bool {
enableMapMu.RLock()
defer enableMapMu.RUnlock()
if enabledMap == nil {
return false
}
return enabledMap[c]
}
func EnableCapability(c Capability) {
enableMapMu.Lock()
defer enableMapMu.Unlock()
enabledMap[c] = true
}
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