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 | "context" |
| 19 | "time" |
| 20 | |
| 21 | pb "github.com/coreos/etcd/etcdserver/etcdserverpb" |
| 22 | "github.com/coreos/etcd/store" |
| 23 | ) |
| 24 | |
| 25 | type RequestV2 pb.Request |
| 26 | |
| 27 | type RequestV2Handler interface { |
| 28 | Post(ctx context.Context, r *RequestV2) (Response, error) |
| 29 | Put(ctx context.Context, r *RequestV2) (Response, error) |
| 30 | Delete(ctx context.Context, r *RequestV2) (Response, error) |
| 31 | QGet(ctx context.Context, r *RequestV2) (Response, error) |
| 32 | Get(ctx context.Context, r *RequestV2) (Response, error) |
| 33 | Head(ctx context.Context, r *RequestV2) (Response, error) |
| 34 | } |
| 35 | |
| 36 | type reqV2HandlerEtcdServer struct { |
| 37 | reqV2HandlerStore |
| 38 | s *EtcdServer |
| 39 | } |
| 40 | |
| 41 | type reqV2HandlerStore struct { |
| 42 | store store.Store |
| 43 | applier ApplierV2 |
| 44 | } |
| 45 | |
| 46 | func NewStoreRequestV2Handler(s store.Store, applier ApplierV2) RequestV2Handler { |
| 47 | return &reqV2HandlerStore{s, applier} |
| 48 | } |
| 49 | |
| 50 | func (a *reqV2HandlerStore) Post(ctx context.Context, r *RequestV2) (Response, error) { |
| 51 | return a.applier.Post(r), nil |
| 52 | } |
| 53 | |
| 54 | func (a *reqV2HandlerStore) Put(ctx context.Context, r *RequestV2) (Response, error) { |
| 55 | return a.applier.Put(r), nil |
| 56 | } |
| 57 | |
| 58 | func (a *reqV2HandlerStore) Delete(ctx context.Context, r *RequestV2) (Response, error) { |
| 59 | return a.applier.Delete(r), nil |
| 60 | } |
| 61 | |
| 62 | func (a *reqV2HandlerStore) QGet(ctx context.Context, r *RequestV2) (Response, error) { |
| 63 | return a.applier.QGet(r), nil |
| 64 | } |
| 65 | |
| 66 | func (a *reqV2HandlerStore) Get(ctx context.Context, r *RequestV2) (Response, error) { |
| 67 | if r.Wait { |
| 68 | wc, err := a.store.Watch(r.Path, r.Recursive, r.Stream, r.Since) |
| 69 | return Response{Watcher: wc}, err |
| 70 | } |
| 71 | ev, err := a.store.Get(r.Path, r.Recursive, r.Sorted) |
| 72 | return Response{Event: ev}, err |
| 73 | } |
| 74 | |
| 75 | func (a *reqV2HandlerStore) Head(ctx context.Context, r *RequestV2) (Response, error) { |
| 76 | ev, err := a.store.Get(r.Path, r.Recursive, r.Sorted) |
| 77 | return Response{Event: ev}, err |
| 78 | } |
| 79 | |
| 80 | func (a *reqV2HandlerEtcdServer) Post(ctx context.Context, r *RequestV2) (Response, error) { |
| 81 | return a.processRaftRequest(ctx, r) |
| 82 | } |
| 83 | |
| 84 | func (a *reqV2HandlerEtcdServer) Put(ctx context.Context, r *RequestV2) (Response, error) { |
| 85 | return a.processRaftRequest(ctx, r) |
| 86 | } |
| 87 | |
| 88 | func (a *reqV2HandlerEtcdServer) Delete(ctx context.Context, r *RequestV2) (Response, error) { |
| 89 | return a.processRaftRequest(ctx, r) |
| 90 | } |
| 91 | |
| 92 | func (a *reqV2HandlerEtcdServer) QGet(ctx context.Context, r *RequestV2) (Response, error) { |
| 93 | return a.processRaftRequest(ctx, r) |
| 94 | } |
| 95 | |
| 96 | func (a *reqV2HandlerEtcdServer) processRaftRequest(ctx context.Context, r *RequestV2) (Response, error) { |
| 97 | data, err := ((*pb.Request)(r)).Marshal() |
| 98 | if err != nil { |
| 99 | return Response{}, err |
| 100 | } |
| 101 | ch := a.s.w.Register(r.ID) |
| 102 | |
| 103 | start := time.Now() |
| 104 | a.s.r.Propose(ctx, data) |
| 105 | proposalsPending.Inc() |
| 106 | defer proposalsPending.Dec() |
| 107 | |
| 108 | select { |
| 109 | case x := <-ch: |
| 110 | resp := x.(Response) |
| 111 | return resp, resp.Err |
| 112 | case <-ctx.Done(): |
| 113 | proposalsFailed.Inc() |
| 114 | a.s.w.Trigger(r.ID, nil) // GC wait |
| 115 | return Response{}, a.s.parseProposeCtxErr(ctx.Err(), start) |
| 116 | case <-a.s.stopping: |
| 117 | } |
| 118 | return Response{}, ErrStopped |
| 119 | } |
| 120 | |
| 121 | func (s *EtcdServer) Do(ctx context.Context, r pb.Request) (Response, error) { |
| 122 | r.ID = s.reqIDGen.Next() |
| 123 | h := &reqV2HandlerEtcdServer{ |
| 124 | reqV2HandlerStore: reqV2HandlerStore{ |
| 125 | store: s.store, |
| 126 | applier: s.applyV2, |
| 127 | }, |
| 128 | s: s, |
| 129 | } |
| 130 | rp := &r |
| 131 | resp, err := ((*RequestV2)(rp)).Handle(ctx, h) |
| 132 | resp.Term, resp.Index = s.Term(), s.Index() |
| 133 | return resp, err |
| 134 | } |
| 135 | |
| 136 | // Handle interprets r and performs an operation on s.store according to r.Method |
| 137 | // and other fields. If r.Method is "POST", "PUT", "DELETE", or a "GET" with |
| 138 | // Quorum == true, r will be sent through consensus before performing its |
| 139 | // respective operation. Do will block until an action is performed or there is |
| 140 | // an error. |
| 141 | func (r *RequestV2) Handle(ctx context.Context, v2api RequestV2Handler) (Response, error) { |
| 142 | if r.Method == "GET" && r.Quorum { |
| 143 | r.Method = "QGET" |
| 144 | } |
| 145 | switch r.Method { |
| 146 | case "POST": |
| 147 | return v2api.Post(ctx, r) |
| 148 | case "PUT": |
| 149 | return v2api.Put(ctx, r) |
| 150 | case "DELETE": |
| 151 | return v2api.Delete(ctx, r) |
| 152 | case "QGET": |
| 153 | return v2api.QGet(ctx, r) |
| 154 | case "GET": |
| 155 | return v2api.Get(ctx, r) |
| 156 | case "HEAD": |
| 157 | return v2api.Head(ctx, r) |
| 158 | } |
| 159 | return Response{}, ErrUnknownMethod |
| 160 | } |
| 161 | |
| 162 | func (r *RequestV2) String() string { |
| 163 | rpb := pb.Request(*r) |
| 164 | return rpb.String() |
| 165 | } |