khenaidoo | 2672188 | 2021-08-11 17:42:52 -0400 | [diff] [blame] | 1 | // Copyright 2016 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 etcdserver |
| 16 | |
| 17 | import ( |
| 18 | "encoding/json" |
| 19 | "path" |
| 20 | "time" |
| 21 | |
| 22 | "github.com/coreos/etcd/etcdserver/api" |
| 23 | "github.com/coreos/etcd/etcdserver/membership" |
| 24 | "github.com/coreos/etcd/pkg/pbutil" |
| 25 | "github.com/coreos/etcd/store" |
| 26 | "github.com/coreos/go-semver/semver" |
| 27 | ) |
| 28 | |
| 29 | // ApplierV2 is the interface for processing V2 raft messages |
| 30 | type ApplierV2 interface { |
| 31 | Delete(r *RequestV2) Response |
| 32 | Post(r *RequestV2) Response |
| 33 | Put(r *RequestV2) Response |
| 34 | QGet(r *RequestV2) Response |
| 35 | Sync(r *RequestV2) Response |
| 36 | } |
| 37 | |
| 38 | func NewApplierV2(s store.Store, c *membership.RaftCluster) ApplierV2 { |
| 39 | return &applierV2store{store: s, cluster: c} |
| 40 | } |
| 41 | |
| 42 | type applierV2store struct { |
| 43 | store store.Store |
| 44 | cluster *membership.RaftCluster |
| 45 | } |
| 46 | |
| 47 | func (a *applierV2store) Delete(r *RequestV2) Response { |
| 48 | switch { |
| 49 | case r.PrevIndex > 0 || r.PrevValue != "": |
| 50 | return toResponse(a.store.CompareAndDelete(r.Path, r.PrevValue, r.PrevIndex)) |
| 51 | default: |
| 52 | return toResponse(a.store.Delete(r.Path, r.Dir, r.Recursive)) |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | func (a *applierV2store) Post(r *RequestV2) Response { |
| 57 | return toResponse(a.store.Create(r.Path, r.Dir, r.Val, true, r.TTLOptions())) |
| 58 | } |
| 59 | |
| 60 | func (a *applierV2store) Put(r *RequestV2) Response { |
| 61 | ttlOptions := r.TTLOptions() |
| 62 | exists, existsSet := pbutil.GetBool(r.PrevExist) |
| 63 | switch { |
| 64 | case existsSet: |
| 65 | if exists { |
| 66 | if r.PrevIndex == 0 && r.PrevValue == "" { |
| 67 | return toResponse(a.store.Update(r.Path, r.Val, ttlOptions)) |
| 68 | } |
| 69 | return toResponse(a.store.CompareAndSwap(r.Path, r.PrevValue, r.PrevIndex, r.Val, ttlOptions)) |
| 70 | } |
| 71 | return toResponse(a.store.Create(r.Path, r.Dir, r.Val, false, ttlOptions)) |
| 72 | case r.PrevIndex > 0 || r.PrevValue != "": |
| 73 | return toResponse(a.store.CompareAndSwap(r.Path, r.PrevValue, r.PrevIndex, r.Val, ttlOptions)) |
| 74 | default: |
| 75 | if storeMemberAttributeRegexp.MatchString(r.Path) { |
| 76 | id := membership.MustParseMemberIDFromKey(path.Dir(r.Path)) |
| 77 | var attr membership.Attributes |
| 78 | if err := json.Unmarshal([]byte(r.Val), &attr); err != nil { |
| 79 | plog.Panicf("unmarshal %s should never fail: %v", r.Val, err) |
| 80 | } |
| 81 | if a.cluster != nil { |
| 82 | a.cluster.UpdateAttributes(id, attr) |
| 83 | } |
| 84 | // return an empty response since there is no consumer. |
| 85 | return Response{} |
| 86 | } |
| 87 | if r.Path == membership.StoreClusterVersionKey() { |
| 88 | if a.cluster != nil { |
| 89 | a.cluster.SetVersion(semver.Must(semver.NewVersion(r.Val)), api.UpdateCapability) |
| 90 | } |
| 91 | // return an empty response since there is no consumer. |
| 92 | return Response{} |
| 93 | } |
| 94 | return toResponse(a.store.Set(r.Path, r.Dir, r.Val, ttlOptions)) |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | func (a *applierV2store) QGet(r *RequestV2) Response { |
| 99 | return toResponse(a.store.Get(r.Path, r.Recursive, r.Sorted)) |
| 100 | } |
| 101 | |
| 102 | func (a *applierV2store) Sync(r *RequestV2) Response { |
| 103 | a.store.DeleteExpiredKeys(time.Unix(0, r.Time)) |
| 104 | return Response{} |
| 105 | } |
| 106 | |
| 107 | // applyV2Request interprets r as a call to store.X and returns a Response interpreted |
| 108 | // from store.Event |
| 109 | func (s *EtcdServer) applyV2Request(r *RequestV2) Response { |
| 110 | defer warnOfExpensiveRequest(time.Now(), r, nil, nil) |
| 111 | |
| 112 | switch r.Method { |
| 113 | case "POST": |
| 114 | return s.applyV2.Post(r) |
| 115 | case "PUT": |
| 116 | return s.applyV2.Put(r) |
| 117 | case "DELETE": |
| 118 | return s.applyV2.Delete(r) |
| 119 | case "QGET": |
| 120 | return s.applyV2.QGet(r) |
| 121 | case "SYNC": |
| 122 | return s.applyV2.Sync(r) |
| 123 | default: |
| 124 | // This should never be reached, but just in case: |
| 125 | return Response{Err: ErrUnknownMethod} |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | func (r *RequestV2) TTLOptions() store.TTLOptionSet { |
| 130 | refresh, _ := pbutil.GetBool(r.Refresh) |
| 131 | ttlOptions := store.TTLOptionSet{Refresh: refresh} |
| 132 | if r.Expiration != 0 { |
| 133 | ttlOptions.ExpireTime = time.Unix(0, r.Expiration) |
| 134 | } |
| 135 | return ttlOptions |
| 136 | } |
| 137 | |
| 138 | func toResponse(ev *store.Event, err error) Response { |
| 139 | return Response{Event: ev, Err: err} |
| 140 | } |