Golang Trace.Event方法代码示例

// sendOne invokes the specified RPC on the supplied client when the
// client is ready. On success, the reply is sent on the channel;
// otherwise an error is sent.
//
// Do not call directly, but instead use sendOneFn. Tests mock out this method
// via sendOneFn in order to test various error cases.
func sendOne(client *rpc.Client, timeout time.Duration, method string,
	getArgs func(addr net.Addr) proto.Message, getReply func() proto.Message,
	context *rpc.Context, trace *tracer.Trace, done chan *netrpc.Call) {

	addr := client.RemoteAddr()
	args := getArgs(addr)
	if args == nil {
		done <- &netrpc.Call{Error: newRPCError(
			util.Errorf("nil arguments returned for client %s", addr))}
		return
	}

	if log.V(2) {
		log.Infof("%s: sending request to %s: %+v", method, addr, args)
	}
	trace.Event(fmt.Sprintf("sending to %s", addr))

	if enableLocalCalls && context.LocalServer != nil && addr.String() == context.LocalAddr {
		if context.LocalServer.LocalCall(method, args, done) {
			return
		}
	}

	reply := getReply()

	// Don't bother firing off a goroutine in the common case where a client
	// is already healthy.
	select {
	case <-client.Healthy():
		client.Go(method, args, reply, done)
		return
	default:
	}

	go func() {
		var timeoutChan <-chan time.Time
		if timeout != 0 {
			timeoutChan = time.After(timeout)
		}
		select {
		case <-client.Healthy():
			client.Go(method, args, reply, done)
		case <-client.Closed:
			done <- &netrpc.Call{Error: newRPCError(
				util.Errorf("rpc to %s failed as client connection was closed", method))}
		case <-timeoutChan:
			done <- &netrpc.Call{Error: newRPCError(
				util.Errorf("rpc to %s: client not ready after %s", method, timeout))}
		}
	}()
}

// cleanupTxn is called when a transaction ends. The transaction record is
// updated and the heartbeat goroutine signaled to clean up the transaction
// gracefully.
func (tc *TxnCoordSender) cleanupTxn(trace *tracer.Trace, txn roachpb.Transaction) {
	trace.Event("coordinator stops")
	tc.Lock()
	defer tc.Unlock()
	txnMeta, ok := tc.txns[string(txn.ID)]
	// The heartbeat might've already removed the record.
	if !ok {
		return
	}

	// The supplied txn may be newer than the one in txnMeta, which is relevant
	// for stats.
	txnMeta.txn = txn
	// Trigger heartbeat shutdown.
	close(txnMeta.txnEnd)
}

// cleanupTxn is called when a transaction ends. The transaction record is
// updated and the heartbeat goroutine signaled to clean up the transaction
// gracefully.
func (tc *TxnCoordSender) cleanupTxn(trace *tracer.Trace, txn proto.Transaction, resolved []proto.Key) {
	tc.Lock()
	defer tc.Unlock()
	txnMeta, ok := tc.txns[string(txn.ID)]
	if !ok {
		return
	}

	// The supplied txn may be newed than the one in txnMeta, which is relevant
	// for stats.
	txnMeta.txn = txn
	// Trigger intent resolution and heartbeat shutdown.
	trace.Event("coordinator stops")
	txnMeta.txnEnd <- resolved // buffered, so does not block
	close(txnMeta.txnEnd)
}

// cleanupTxn is called when a transaction ends. The transaction record is
// updated and the heartbeat goroutine signaled to clean up the transaction
// gracefully.
func (tc *TxnCoordSender) cleanupTxn(trace *tracer.Trace, txn proto.Transaction) {
	tc.Lock()
	defer tc.Unlock()
	txnMeta, ok := tc.txns[string(txn.ID)]
	// Only clean up once per transaction.
	if !ok || txnMeta.txnEnd == nil {
		return
	}

	// The supplied txn may be newed than the one in txnMeta, which is relevant
	// for stats.
	txnMeta.txn = txn
	// Trigger heartbeat shutdown.
	trace.Event("coordinator stops")
	close(txnMeta.txnEnd)
	txnMeta.txnEnd = nil // for idempotency; checked above
}

// close sends resolve intent commands for all key ranges this
// transaction has covered, clears the keys cache and closes the
// metadata heartbeat. Any keys listed in the resolved slice have
// already been resolved and do not receive resolve intent commands.
func (tm *txnMetadata) close(trace *tracer.Trace, txn *proto.Transaction, resolved []proto.Key, sender client.Sender, stopper *stop.Stopper) {
	close(tm.txnEnd) // stop heartbeat
	trace.Event("coordinator stops")
	if tm.keys.Len() > 0 {
		if log.V(2) {
			log.Infof("cleaning up %d intent(s) for transaction %s", tm.keys.Len(), txn)
		}
	}
	// TODO(tschottdorf): Should create a Batch here.
	for _, o := range tm.keys.GetOverlaps(proto.KeyMin, proto.KeyMax) {
		// If the op was range based, end key != start key: resolve a range.
		var call proto.Call
		key := o.Key.Start().(proto.Key)
		endKey := o.Key.End().(proto.Key)
		if !key.Next().Equal(endKey) {
			call.Args = &proto.InternalResolveIntentRangeRequest{
				RequestHeader: proto.RequestHeader{
					Timestamp: txn.Timestamp,
					Key:       key,
					EndKey:    endKey,
					User:      security.RootUser,
					Txn:       txn,
				},
			}
			call.Reply = &proto.InternalResolveIntentRangeResponse{}
		} else {
			// Check if the key has already been resolved; skip if yes.
			found := false
			for _, k := range resolved {
				if key.Equal(k) {
					found = true
				}
			}
			if found {
				continue
			}
			call.Args = &proto.InternalResolveIntentRequest{
				RequestHeader: proto.RequestHeader{
					Timestamp: txn.Timestamp,
					Key:       key,
					User:      security.RootUser,
					Txn:       txn,
				},
			}
			call.Reply = &proto.InternalResolveIntentResponse{}
		}
		// We don't care about the reply channel; these are best
		// effort. We simply fire and forget, each in its own goroutine.
		ctx := tracer.ToCtx(context.Background(), trace.Fork())
		stopper.RunAsyncTask(func() {
			if log.V(2) {
				log.Infof("cleaning up intent %q for txn %s", call.Args.Header().Key, txn)
			}
			sender.Send(ctx, call)
			if call.Reply.Header().Error != nil {
				log.Warningf("failed to cleanup %q intent: %s", call.Args.Header().Key, call.Reply.Header().GoError())
			}
		})
	}
	tm.keys.Clear()
}