func (s *EtcdServer) processInternalRaftRequest(ctx context.Context, r pb.InternalRaftRequest) (*applyResult, error) {
r.ID = s.reqIDGen.Next()
data, err := r.Marshal()
if err != nil {
return nil, err
}
if len(data) > maxRequestBytes {
return nil, ErrRequestTooLarge
}
ch := s.w.Register(r.ID)
s.r.Propose(ctx, data)
select {
case x := <-ch:
return x.(*applyResult), nil
case <-ctx.Done():
s.w.Trigger(r.ID, nil) // GC wait
return nil, ctx.Err()
case <-s.done:
return nil, ErrStopped
}
}
// Do 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 (s *EtcdServer) Do(ctx context.Context, r pb.Request) (Response, error) {
r.ID = s.reqIDGen.Next()
if r.Method == "GET" && r.Quorum {
r.Method = "QGET"
}
switch r.Method {
case "POST", "PUT", "DELETE", "QGET":
var raftReq pb.InternalRaftRequest
raftReq.V2 = &r
data, err := raftReq.Marshal()
if err != nil {
return Response{}, err
}
ch := s.w.Register(r.ID)
// TODO: benchmark the cost of time.Now()
// might be sampling?
start := time.Now()
s.r.Propose(ctx, data)
proposePending.Inc()
defer proposePending.Dec()
select {
case x := <-ch:
proposeDurations.Observe(float64(time.Since(start).Nanoseconds() / int64(time.Millisecond)))
resp := x.(Response)
return resp, resp.err
case <-ctx.Done():
proposeFailed.Inc()
s.w.Trigger(r.ID, nil) // GC wait
return Response{}, parseCtxErr(ctx.Err())
case <-s.done:
return Response{}, ErrStopped
}
case "GET":
switch {
case r.Wait:
wc, err := s.store.Watch(r.Path, r.Recursive, r.Stream, r.Since)
if err != nil {
return Response{}, err
}
return Response{Watcher: wc}, nil
default:
ev, err := s.store.Get(r.Path, r.Recursive, r.Sorted)
if err != nil {
return Response{}, err
}
return Response{Event: ev}, nil
}
case "HEAD":
ev, err := s.store.Get(r.Path, r.Recursive, r.Sorted)
if err != nil {
return Response{}, err
}
return Response{Event: ev}, nil
default:
return Response{}, ErrUnknownMethod
}
}
func (s *EtcdServer) processInternalRaftRequestOnce(ctx context.Context, r pb.InternalRaftRequest) (*applyResult, error) {
ai := s.getAppliedIndex()
ci := s.getCommittedIndex()
if ci > ai+maxGapBetweenApplyAndCommitIndex {
return nil, ErrTooManyRequests
}
r.Header = &pb.RequestHeader{
ID: s.reqIDGen.Next(),
}
authInfo, err := s.authInfoFromCtx(ctx)
if err != nil {
return nil, err
}
if authInfo != nil {
r.Header.Username = authInfo.Username
r.Header.AuthRevision = authInfo.Revision
}
data, err := r.Marshal()
if err != nil {
return nil, err
}
if len(data) > maxRequestBytes {
return nil, ErrRequestTooLarge
}
id := r.ID
if id == 0 {
id = r.Header.ID
}
ch := s.w.Register(id)
cctx, cancel := context.WithTimeout(ctx, s.Cfg.ReqTimeout())
defer cancel()
start := time.Now()
s.r.Propose(cctx, data)
proposalsPending.Inc()
defer proposalsPending.Dec()
select {
case x := <-ch:
return x.(*applyResult), nil
case <-cctx.Done():
proposalsFailed.Inc()
s.w.Trigger(id, nil) // GC wait
return nil, s.parseProposeCtxErr(cctx.Err(), start)
case <-s.done:
return nil, ErrStopped
}
}
// From public API method to proposalc.
func (s *etcdStore) proposeInternalRaftRequest(req etcdserverpb.InternalRaftRequest) (<-chan proto.Message, <-chan error, error) {
data, err := req.Marshal()
if err != nil {
return nil, nil, err
}
if len(data) > maxRequestBytes {
return nil, nil, errTooBig
}
msgc, errc, err := s.registerPending(req.ID)
if err != nil {
return nil, nil, err
}
s.proposalc <- data
return msgc, errc, nil
}
func (s *EtcdServer) processInternalRaftRequest(ctx context.Context, r pb.InternalRaftRequest) (*applyResult, error) {
r.Header = &pb.RequestHeader{
ID: s.reqIDGen.Next(),
}
username, err := s.usernameFromCtx(ctx)
if err != nil {
return nil, err
}
r.Header.Username = username
data, err := r.Marshal()
if err != nil {
return nil, err
}
if len(data) > maxRequestBytes {
return nil, ErrRequestTooLarge
}
id := r.ID
if id == 0 {
id = r.Header.ID
}
ch := s.w.Register(id)
cctx, cancel := context.WithTimeout(ctx, maxV3RequestTimeout)
defer cancel()
start := time.Now()
s.r.Propose(cctx, data)
proposalsPending.Inc()
defer proposalsPending.Dec()
select {
case x := <-ch:
return x.(*applyResult), nil
case <-cctx.Done():
proposalsFailed.Inc()
s.w.Trigger(id, nil) // GC wait
return nil, s.parseProposeCtxErr(cctx.Err(), start)
case <-s.done:
return nil, ErrStopped
}
}
func (s *EtcdServer) V3DemoDo(ctx context.Context, r pb.InternalRaftRequest) (proto.Message, error) {
r.ID = s.reqIDGen.Next()
data, err := r.Marshal()
if err != nil {
return &pb.EmptyResponse{}, err
}
ch := s.w.Register(r.ID)
s.r.Propose(ctx, data)
select {
case x := <-ch:
resp := x.(proto.Message)
return resp, nil
case <-ctx.Done():
s.w.Trigger(r.ID, nil) // GC wait
return &pb.EmptyResponse{}, ctx.Err()
case <-s.done:
return &pb.EmptyResponse{}, ErrStopped
}
}