// 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":
data, err := r.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
}
}
// Step advances the state machine using msgs. The ctx.Err() will be returned,
// if any.
func (n *node) step(ctx context.Context, m pb.Message) error {
ch := n.recvc
if m.Type == pb.MsgProp {
ch = n.propc
}
select {
case ch <- m:
return nil
case <-ctx.Done():
return ctx.Err()
case <-n.done:
return ErrStopped
}
}
func (mn *multiNode) step(ctx context.Context, m multiMessage) error {
ch := mn.recvc
if m.msg.Type == pb.MsgProp {
ch = mn.propc
}
select {
case ch <- m:
return nil
case <-ctx.Done():
return ctx.Err()
case <-mn.done:
return ErrStopped
}
}
func (c *simpleHTTPClient) Do(ctx context.Context, act httpAction) (*http.Response, []byte, error) {
req := act.HTTPRequest(c.endpoint)
rtchan := make(chan roundTripResponse, 1)
go func() {
resp, err := c.transport.RoundTrip(req)
rtchan <- roundTripResponse{resp: resp, err: err}
close(rtchan)
}()
var resp *http.Response
var err error
select {
case rtresp := <-rtchan:
resp, err = rtresp.resp, rtresp.err
case <-ctx.Done():
// cancel and wait for request to actually exit before continuing
c.transport.CancelRequest(req)
rtresp := <-rtchan
resp = rtresp.resp
err = ctx.Err()
}
// always check for resp nil-ness to deal with possible
// race conditions between channels above
defer func() {
if resp != nil {
resp.Body.Close()
}
}()
if err != nil {
return nil, nil, err
}
body, err := ioutil.ReadAll(resp.Body)
return resp, body, err
}
// configure sends a configuration change through consensus and
// then waits for it to be applied to the server. It
// will block until the change is performed or there is an error.
func (s *EtcdServer) configure(ctx context.Context, cc raftpb.ConfChange) error {
cc.ID = s.reqIDGen.Next()
ch := s.w.Register(cc.ID)
if err := s.r.ProposeConfChange(ctx, cc); err != nil {
s.w.Trigger(cc.ID, nil)
return err
}
select {
case x := <-ch:
if err, ok := x.(error); ok {
return err
}
if x != nil {
log.Panicf("return type should always be error")
}
return nil
case <-ctx.Done():
s.w.Trigger(cc.ID, nil) // GC wait
return parseCtxErr(ctx.Err())
case <-s.done:
return ErrStopped
}
}