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// Copyright 2016 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 etcdserver
import (
"encoding/json"
"fmt"
"path"
"strconv"
"time"
"github.com/coreos/go-semver/semver"
"go.etcd.io/etcd/pkg/v3/pbutil"
"go.etcd.io/etcd/server/v3/etcdserver/api"
"go.etcd.io/etcd/server/v3/etcdserver/api/membership"
"go.etcd.io/etcd/server/v3/etcdserver/api/v2store"
"go.uber.org/zap"
)
const v2Version = "v2"
// ApplierV2 is the interface for processing V2 raft messages
type ApplierV2 interface {
Delete(r *RequestV2) Response
Post(r *RequestV2) Response
Put(r *RequestV2, shouldApplyV3 membership.ShouldApplyV3) Response
QGet(r *RequestV2) Response
Sync(r *RequestV2) Response
}
func NewApplierV2(lg *zap.Logger, s v2store.Store, c *membership.RaftCluster) ApplierV2 {
if lg == nil {
lg = zap.NewNop()
}
return &applierV2store{lg: lg, store: s, cluster: c}
}
type applierV2store struct {
lg *zap.Logger
store v2store.Store
cluster *membership.RaftCluster
}
func (a *applierV2store) Delete(r *RequestV2) Response {
switch {
case r.PrevIndex > 0 || r.PrevValue != "":
return toResponse(a.store.CompareAndDelete(r.Path, r.PrevValue, r.PrevIndex))
default:
return toResponse(a.store.Delete(r.Path, r.Dir, r.Recursive))
}
}
func (a *applierV2store) Post(r *RequestV2) Response {
return toResponse(a.store.Create(r.Path, r.Dir, r.Val, true, r.TTLOptions()))
}
func (a *applierV2store) Put(r *RequestV2, shouldApplyV3 membership.ShouldApplyV3) Response {
ttlOptions := r.TTLOptions()
exists, existsSet := pbutil.GetBool(r.PrevExist)
switch {
case existsSet:
if exists {
if r.PrevIndex == 0 && r.PrevValue == "" {
return toResponse(a.store.Update(r.Path, r.Val, ttlOptions))
}
return toResponse(a.store.CompareAndSwap(r.Path, r.PrevValue, r.PrevIndex, r.Val, ttlOptions))
}
return toResponse(a.store.Create(r.Path, r.Dir, r.Val, false, ttlOptions))
case r.PrevIndex > 0 || r.PrevValue != "":
return toResponse(a.store.CompareAndSwap(r.Path, r.PrevValue, r.PrevIndex, r.Val, ttlOptions))
default:
if storeMemberAttributeRegexp.MatchString(r.Path) {
id := membership.MustParseMemberIDFromKey(a.lg, path.Dir(r.Path))
var attr membership.Attributes
if err := json.Unmarshal([]byte(r.Val), &attr); err != nil {
a.lg.Panic("failed to unmarshal", zap.String("value", r.Val), zap.Error(err))
}
if a.cluster != nil {
a.cluster.UpdateAttributes(id, attr, shouldApplyV3)
}
// return an empty response since there is no consumer.
return Response{}
}
// TODO remove v2 version set to avoid the conflict between v2 and v3 in etcd 3.6
if r.Path == membership.StoreClusterVersionKey() {
if a.cluster != nil {
// persist to backend given v2store can be very stale
a.cluster.SetVersion(semver.Must(semver.NewVersion(r.Val)), api.UpdateCapability, shouldApplyV3)
}
return Response{}
}
return toResponse(a.store.Set(r.Path, r.Dir, r.Val, ttlOptions))
}
}
func (a *applierV2store) QGet(r *RequestV2) Response {
return toResponse(a.store.Get(r.Path, r.Recursive, r.Sorted))
}
func (a *applierV2store) Sync(r *RequestV2) Response {
a.store.DeleteExpiredKeys(time.Unix(0, r.Time))
return Response{}
}
// applyV2Request interprets r as a call to v2store.X
// and returns a Response interpreted from v2store.Event
func (s *EtcdServer) applyV2Request(r *RequestV2, shouldApplyV3 membership.ShouldApplyV3) (resp Response) {
stringer := panicAlternativeStringer{
stringer: r,
alternative: func() string { return fmt.Sprintf("id:%d,method:%s,path:%s", r.ID, r.Method, r.Path) },
}
defer func(start time.Time) {
success := resp.Err == nil
applySec.WithLabelValues(v2Version, r.Method, strconv.FormatBool(success)).Observe(time.Since(start).Seconds())
warnOfExpensiveRequest(s.Logger(), s.Cfg.WarningApplyDuration, start, stringer, nil, nil)
}(time.Now())
switch r.Method {
case "POST":
return s.applyV2.Post(r)
case "PUT":
return s.applyV2.Put(r, shouldApplyV3)
case "DELETE":
return s.applyV2.Delete(r)
case "QGET":
return s.applyV2.QGet(r)
case "SYNC":
return s.applyV2.Sync(r)
default:
// This should never be reached, but just in case:
return Response{Err: ErrUnknownMethod}
}
}
func (r *RequestV2) TTLOptions() v2store.TTLOptionSet {
refresh, _ := pbutil.GetBool(r.Refresh)
ttlOptions := v2store.TTLOptionSet{Refresh: refresh}
if r.Expiration != 0 {
ttlOptions.ExpireTime = time.Unix(0, r.Expiration)
}
return ttlOptions
}
func toResponse(ev *v2store.Event, err error) Response {
return Response{Event: ev, Err: err}
}
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