func (s *HandlerTestSuite) SetupTest() {
// Create a test node, on its own. Tests can join this to the cluster for
// testing, if they want.
s.testNode = newChannelNode(s.T())
// Create a cluster for testing. Join these guys to each other.
s.cluster = newSwimCluster(4)
s.cluster.Bootstrap()
s.ctx, s.ctxCancel = shared.NewTChannelContext(500 * time.Millisecond)
}
func (s *requestSender) Send() (res []byte, err error) {
ctx, cancel := shared.NewTChannelContext(s.timeout)
defer cancel()
var forwardError, applicationError error
select {
case <-s.MakeCall(ctx, &res, &forwardError, &applicationError):
if applicationError != nil {
return nil, applicationError
}
if forwardError == nil {
if s.retries > 0 {
// forwarding succeeded after retries
s.emitter.emit(RetrySuccessEvent{s.retries})
}
return res, nil
}
if s.retries < s.maxRetries {
return s.ScheduleRetry()
}
identity, _ := s.sender.WhoAmI()
s.logger.WithFields(log.Fields{
"local": identity,
"destination": s.destination,
"service": s.service,
"endpoint": s.endpoint,
}).Warn("max retries exceeded for request")
s.emitter.emit(MaxRetriesEvent{s.maxRetries})
return nil, errors.New("max retries exceeded")
case <-ctx.Done(): // request timed out
identity, _ := s.sender.WhoAmI()
s.logger.WithFields(log.Fields{
"local": identity,
"destination": s.destination,
"service": s.service,
"endpoint": s.endpoint,
}).Warn("request timed out")
return nil, errors.New("request timed out")
}
}
func (p *pingSender) SendPing() (*ping, error) {
ctx, cancel := shared.NewTChannelContext(p.timeout)
defer cancel()
var res ping
select {
case err := <-p.MakeCall(ctx, &res):
if err != nil {
return nil, err
}
return &res, nil
case <-ctx.Done(): // ping timed out
return nil, errors.New("ping timed out")
}
}
func (p *pingRequestSender) SendPingRequest() (*pingResponse, error) {
p.logger.WithFields(log.Fields{
"peer": p.peer,
"target": p.target,
}).Debug("ping request send")
ctx, cancel := shared.NewTChannelContext(p.timeout)
defer cancel()
var res pingResponse
select {
case err := <-p.MakeCall(ctx, &res):
if err == nil {
p.node.memberlist.Update(res.Changes)
}
return &res, err
case <-ctx.Done(): // call timed out
return nil, errors.New("ping request timed out")
}
}
func (n *testNode) closeAndWait(sender *tchannel.Channel) {
n.channel.Close()
// wait for tchannel to respond with connection refused errors.
for {
ctx, cancel := shared.NewTChannelContext(time.Millisecond * 50)
err := sender.Ping(ctx, n.node.Address())
if err == nil {
cancel()
continue
}
_, ok := err.(tchannel.SystemError)
if ok {
cancel()
continue
}
cancel()
break
}
}
func (j *joinSender) JoinGroup(nodesJoined []string) ([]string, []string) {
group := j.SelectGroup(nodesJoined)
var responses struct {
successes []string
failures []string
sync.Mutex
}
var numNodesLeft = j.size - len(nodesJoined)
var startTime = time.Now()
var wg sync.WaitGroup
j.numTries++
j.node.emit(JoinTriesUpdateEvent{j.numTries})
for _, node := range group {
wg.Add(1)
go func(n string) {
ctx, cancel := shared.NewTChannelContext(j.timeout)
defer cancel()
var res joinResponse
var failed bool
select {
case err := <-j.MakeCall(ctx, n, &res):
if err != nil {
j.logger.WithFields(log.Fields{
"remote": n,
"timeout": j.timeout,
}).Debug("attempt to join node failed")
failed = true
break
}
j.node.memberlist.AddJoinList(res.Membership)
case <-ctx.Done():
j.logger.WithFields(log.Fields{
"remote": n,
"timeout": j.timeout,
}).Debug("attempt to join node timed out")
failed = true
}
if !failed {
responses.Lock()
responses.successes = append(responses.successes, n)
responses.Unlock()
} else {
responses.Lock()
responses.failures = append(responses.failures, n)
responses.Unlock()
}
wg.Done()
}(node)
}
// wait for joins to complete
wg.Wait()
// don't need to lock successes/failures since we're finished writing to them
j.logger.WithFields(log.Fields{
"groupSize": len(group),
"joinSize": j.size,
"joinTime": time.Now().Sub(startTime),
"numNodesLeft": numNodesLeft,
"numFailures": len(responses.failures),
"failures": responses.failures,
"numSuccesses": len(responses.successes),
"successes": responses.successes,
}).Debug("join group complete")
return responses.successes, responses.failures
}