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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 (
"context"
"time"
pb "go.etcd.io/etcd/api/v3/etcdserverpb"
"go.etcd.io/etcd/server/v3/etcdserver/api/membership"
"go.etcd.io/etcd/server/v3/etcdserver/api/v2store"
)
type RequestV2 pb.Request
type RequestV2Handler interface {
Post(ctx context.Context, r *RequestV2) (Response, error)
Put(ctx context.Context, r *RequestV2) (Response, error)
Delete(ctx context.Context, r *RequestV2) (Response, error)
QGet(ctx context.Context, r *RequestV2) (Response, error)
Get(ctx context.Context, r *RequestV2) (Response, error)
Head(ctx context.Context, r *RequestV2) (Response, error)
}
type reqV2HandlerEtcdServer struct {
reqV2HandlerStore
s *EtcdServer
}
type reqV2HandlerStore struct {
store v2store.Store
applier ApplierV2
}
func NewStoreRequestV2Handler(s v2store.Store, applier ApplierV2) RequestV2Handler {
return &reqV2HandlerStore{s, applier}
}
func (a *reqV2HandlerStore) Post(ctx context.Context, r *RequestV2) (Response, error) {
return a.applier.Post(r), nil
}
func (a *reqV2HandlerStore) Put(ctx context.Context, r *RequestV2) (Response, error) {
return a.applier.Put(r, membership.ApplyBoth), nil
}
func (a *reqV2HandlerStore) Delete(ctx context.Context, r *RequestV2) (Response, error) {
return a.applier.Delete(r), nil
}
func (a *reqV2HandlerStore) QGet(ctx context.Context, r *RequestV2) (Response, error) {
return a.applier.QGet(r), nil
}
func (a *reqV2HandlerStore) Get(ctx context.Context, r *RequestV2) (Response, error) {
if r.Wait {
wc, err := a.store.Watch(r.Path, r.Recursive, r.Stream, r.Since)
return Response{Watcher: wc}, err
}
ev, err := a.store.Get(r.Path, r.Recursive, r.Sorted)
return Response{Event: ev}, err
}
func (a *reqV2HandlerStore) Head(ctx context.Context, r *RequestV2) (Response, error) {
ev, err := a.store.Get(r.Path, r.Recursive, r.Sorted)
return Response{Event: ev}, err
}
func (a *reqV2HandlerEtcdServer) Post(ctx context.Context, r *RequestV2) (Response, error) {
return a.processRaftRequest(ctx, r)
}
func (a *reqV2HandlerEtcdServer) Put(ctx context.Context, r *RequestV2) (Response, error) {
return a.processRaftRequest(ctx, r)
}
func (a *reqV2HandlerEtcdServer) Delete(ctx context.Context, r *RequestV2) (Response, error) {
return a.processRaftRequest(ctx, r)
}
func (a *reqV2HandlerEtcdServer) QGet(ctx context.Context, r *RequestV2) (Response, error) {
return a.processRaftRequest(ctx, r)
}
func (a *reqV2HandlerEtcdServer) processRaftRequest(ctx context.Context, r *RequestV2) (Response, error) {
data, err := ((*pb.Request)(r)).Marshal()
if err != nil {
return Response{}, err
}
ch := a.s.w.Register(r.ID)
start := time.Now()
a.s.r.Propose(ctx, data)
proposalsPending.Inc()
defer proposalsPending.Dec()
select {
case x := <-ch:
resp := x.(Response)
return resp, resp.Err
case <-ctx.Done():
proposalsFailed.Inc()
a.s.w.Trigger(r.ID, nil) // GC wait
return Response{}, a.s.parseProposeCtxErr(ctx.Err(), start)
case <-a.s.stopping:
}
return Response{}, ErrStopped
}
func (s *EtcdServer) Do(ctx context.Context, r pb.Request) (Response, error) {
r.ID = s.reqIDGen.Next()
h := &reqV2HandlerEtcdServer{
reqV2HandlerStore: reqV2HandlerStore{
store: s.v2store,
applier: s.applyV2,
},
s: s,
}
rp := &r
resp, err := ((*RequestV2)(rp)).Handle(ctx, h)
resp.Term, resp.Index = s.Term(), s.CommittedIndex()
return resp, err
}
// Handle interprets r and performs an operation on s.store according to r.Method
// and other fields. If r.Method is "POST", "PUT", "DELETE", or a "GET" with
// Quorum == true, r will be sent through consensus before performing its
// respective operation. Do will block until an action is performed or there is
// an error.
func (r *RequestV2) Handle(ctx context.Context, v2api RequestV2Handler) (Response, error) {
if r.Method == "GET" && r.Quorum {
r.Method = "QGET"
}
switch r.Method {
case "POST":
return v2api.Post(ctx, r)
case "PUT":
return v2api.Put(ctx, r)
case "DELETE":
return v2api.Delete(ctx, r)
case "QGET":
return v2api.QGet(ctx, r)
case "GET":
return v2api.Get(ctx, r)
case "HEAD":
return v2api.Head(ctx, r)
}
return Response{}, ErrUnknownMethod
}
func (r *RequestV2) String() string {
rpb := pb.Request(*r)
return rpb.String()
}
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