cred, _, _ = getReqAccessKeyV4(r, region, serviceS3)
	if cred.AccessKey == "" {
		cred, _, _ = getReqAccessKeyV2(r)
	}
	return cred
}

// Extract request params to be sent with event notification.
func extractReqParams(r *http.Request) map[string]string {
	if r == nil {
		return nil
	}

	region := globalSite.Region()
	cred := getReqAccessCred(r, region)

            new EstablishBuildEnvironment(processEnvironment),
            new LogToClient(loggingManager, daemonDiagnostics), // from this point down, logging is sent back to the client
            new LogAndCheckHealth(healthStats, healthCheck, runningStats),
            new ForwardClientInput(inputReader, eventDispatch),
            new RequestStopIfSingleUsedDaemon(),

		}
	}

	if metadata == nil {
		metadata = make(map[string]string)
	}

	wantCRC, err := hash.GetContentChecksum(hdr)
	if err != nil {
		return opts, fmt.Errorf("invalid/unknown checksum sent: %v", err)
	}
	etag := strings.TrimSpace(hdr.Get(xhttp.MinIOSourceETag))

	if crypto.S3KMS.IsRequested(hdr) {
		keyID, context, err := crypto.S3KMS.ParseHTTP(hdr)
		if err != nil {
			return ObjectOptions{}, err

// response returned the optimal result. Checks include correctness checks (e.g. if a config changed,
// we must include it) and possible optimizations (e.g. we sent a config, but it was not changed).
func (s *DiscoveryServer) compareDiff(
	con *Connection,
	w *model.WatchedResource,
	sotwRes model.Resources,
	deltaRes model.Resources,
	deleted model.DeletedResources,

	ActualSize int64

	// Checksum values
	ChecksumCRC32  string
	ChecksumCRC32C string
	ChecksumSHA1   string
	ChecksumSHA256 string
}

// CompletePart - represents the part that was completed, this is sent by the client
// during CompleteMultipartUpload request.
type CompletePart struct {
	// Part number identifying the part. This is a positive integer between 1 and
	// 10,000
	PartNumber int

	// producer. If an error occurs or Stop() is called, the producer must
	// close this channel and release any resources used by the watch.
	// Closing the result channel tells the consumer that no more events will be
	// sent.
	ResultChan() <-chan Event
}

// EventType defines the possible types of events.
type EventType string

const (
	Added    EventType = "ADDED"
	Modified EventType = "MODIFIED"

// Insert an XlaAllReduce.
Value CreateAllReduce(ReplicateOp replicate, OpBuilder& builder,
                      Value block_arg) {
  // This group_assignment is a list of all replicas. This says that the
  // reduction sent to each replica is over all replicas.
  uint32_t num_replicas = replicate.getN();
  llvm::SmallVector<int32_t, 4> group_assignment_val;
  for (int i = 0; i < num_replicas; ++i) group_assignment_val.push_back(i);

				Err:    fmt.Errorf("checksum type mismatch"),
			}
		}
	}

	var checksumCombined []byte

	// However, in case of encryption, the persisted part ETags don't match
	// what we have sent to the client during PutObjectPart. The reason is
	// that ETags are encrypted. Hence, the client will send a list of complete
	// part ETags of which non can match the ETag of any part. For example

	}()
	Sleep(sched)
	notDone(done)
	tim.Reset(sched / 2)
	Sleep(sched)
	waitDone(done)
	tim.Stop()
	close(stop)
	waitDone(done1)
	waitDone(done2)
	if isTicker {
		// extra send might have sent done again
		// (handled by buffering done above).
		select {
		default:
		case <-done:
		}
		// extra send after that might have filled C.
		select {
		default:
		case <-C:
		}
	}

func (sim *Simulation) Run(input Call) (result Result) {
	result = Result{t: sim.t}
	input = input.FillDefaults()
	if input.Alpn != "" && input.TLS == Plaintext {
		result.Error = fmt.Errorf("invalid call, ALPN can only be sent in TLS requests")
		return result
	}

	// First we will match a listener
	l := matchListener(sim.Listeners, input)
	if l == nil {
		result.Error = ErrNoListener
		return
	}