rpcclient: refactor event-based waiting loop
Avoid receiver channels locks.
This commit is contained in:
Anna Shaleva
parent
95e23c8e46
commit
1399496dfb
1 changed files with 78 additions and 75 deletions
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@ -219,25 +219,80 @@ func (w *EventWaiter) Wait(h util.Uint256, vub uint32, err error) (res *state.Ap
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func (w *EventWaiter) WaitAny(ctx context.Context, vub uint32, hashes ...util.Uint256) (res *state.AppExecResult, waitErr error) {
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var (
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wsWaitErr error
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bRcvr = make(chan *block.Block)
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aerRcvr = make(chan *state.AppExecResult)
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unsubErrs = make(chan error)
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waitersActive int
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bRcvr = make(chan *block.Block, 2)
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aerRcvr = make(chan *state.AppExecResult, len(hashes))
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unsubErrs = make(chan error)
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exit = make(chan struct{})
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)
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// Rollback to a poll-based waiter if needed.
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defer func() {
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if wsWaitErr != nil {
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res, waitErr = w.polling.WaitAny(ctx, vub, hashes...)
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if waitErr != nil {
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// Wrap the poll-based error, it's more important.
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waitErr = fmt.Errorf("event-based error: %v; poll-based waiter error: %w", wsWaitErr, waitErr)
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// Execution event preceded the block event, thus wait until the VUB-th block to be sure.
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since := vub
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blocksID, err := w.ws.ReceiveBlocks(&neorpc.BlockFilter{Since: &since}, bRcvr)
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if err != nil {
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wsWaitErr = fmt.Errorf("failed to subscribe for new blocks: %w", err)
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} else {
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waitersActive++
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go func() {
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<-exit
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err = w.ws.Unsubscribe(blocksID)
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if err != nil {
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unsubErrs <- fmt.Errorf("failed to unsubscribe from blocks (id: %s): %w", blocksID, err)
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return
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}
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unsubErrs <- nil
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}()
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}
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if wsWaitErr == nil {
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for _, h := range hashes {
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txsID, err := w.ws.ReceiveExecutions(&neorpc.ExecutionFilter{Container: &h}, aerRcvr)
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if err != nil {
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wsWaitErr = fmt.Errorf("failed to subscribe for execution results: %w", err)
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break
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}
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waitersActive++
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go func() {
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<-exit
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err = w.ws.Unsubscribe(txsID)
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if err != nil {
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unsubErrs <- fmt.Errorf("failed to unsubscribe from transactions (id: %s): %w", txsID, err)
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return
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}
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unsubErrs <- nil
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}()
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}
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}()
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}
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// Drain receivers to avoid other notification receivers blocking.
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defer func() {
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if wsWaitErr == nil {
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select {
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case b, ok := <-bRcvr:
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if !ok {
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// We're toast, retry with non-ws client.
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wsWaitErr = ErrMissedEvent
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break
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}
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// We can easily end up in a situation when subscription was performed too late and
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// the desired transaction and VUB-th block have already got accepted before the
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// subscription happened. Thus, always retry with non-ws client, it will perform
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// AER requests and make sure.
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wsWaitErr = fmt.Errorf("block #%d was received by EventWaiter", b.Index)
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case aer, ok := <-aerRcvr:
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if !ok {
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// We're toast, retry with non-ws client.
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wsWaitErr = ErrMissedEvent
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break
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}
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res = aer
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case <-w.ws.Context().Done():
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waitErr = fmt.Errorf("%w: %v", ErrContextDone, w.ws.Context().Err())
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case <-ctx.Done():
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waitErr = fmt.Errorf("%w: %v", ErrContextDone, ctx.Err())
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}
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}
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close(exit)
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if waitersActive > 0 {
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// Drain receivers to avoid other notification receivers blocking.
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drainLoop:
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for {
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select {
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@ -260,72 +315,20 @@ func (w *EventWaiter) WaitAny(ctx context.Context, vub uint32, hashes ...util.Ui
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}
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}
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}
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if wsWaitErr == nil || !errors.Is(wsWaitErr, ErrMissedEvent) {
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close(bRcvr)
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close(aerRcvr)
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}
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}()
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// Execution event preceded the block event, thus wait until the VUB-th block to be sure.
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since := vub
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blocksID, err := w.ws.ReceiveBlocks(&neorpc.BlockFilter{Since: &since}, bRcvr)
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if err != nil {
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wsWaitErr = fmt.Errorf("failed to subscribe for new blocks: %w", err)
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return
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}
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waitersActive++
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defer func() {
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go func() {
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err = w.ws.Unsubscribe(blocksID)
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if err != nil {
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unsubErrs <- fmt.Errorf("failed to unsubscribe from blocks (id: %s): %w", blocksID, err)
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return
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}
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unsubErrs <- nil
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}()
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}()
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for _, h := range hashes {
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txsID, err := w.ws.ReceiveExecutions(&neorpc.ExecutionFilter{Container: &h}, aerRcvr)
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if err != nil {
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wsWaitErr = fmt.Errorf("failed to subscribe for execution results: %w", err)
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return
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}
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waitersActive++
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defer func() {
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go func() {
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err = w.ws.Unsubscribe(txsID)
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if err != nil {
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unsubErrs <- fmt.Errorf("failed to unsubscribe from transactions (id: %s): %w", txsID, err)
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return
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}
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unsubErrs <- nil
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}()
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}()
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if wsWaitErr == nil || !errors.Is(wsWaitErr, ErrMissedEvent) {
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close(bRcvr)
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close(aerRcvr)
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}
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close(unsubErrs)
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select {
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case b, ok := <-bRcvr:
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if !ok {
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// We're toast, retry with non-ws client.
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wsWaitErr = ErrMissedEvent
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return
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// Rollback to a poll-based waiter if needed.
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if wsWaitErr != nil && waitErr == nil {
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res, waitErr = w.polling.WaitAny(ctx, vub, hashes...)
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if waitErr != nil {
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// Wrap the poll-based error, it's more important.
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waitErr = fmt.Errorf("event-based error: %v; poll-based waiter error: %w", wsWaitErr, waitErr)
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}
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// We can easily end up in a situation when subscription was performed too late and
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// the desired transaction and VUB-th block have already got accepted before the
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// subscription happened. Thus, always retry with non-ws client, it will perform
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// AER requests and make sure.
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wsWaitErr = fmt.Errorf("block #%d was received by EventWaiter", b.Index)
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case aer, ok := <-aerRcvr:
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if !ok {
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// We're toast, retry with non-ws client.
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wsWaitErr = ErrMissedEvent
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return
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}
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res = aer
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case <-w.ws.Context().Done():
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waitErr = fmt.Errorf("%w: %v", ErrContextDone, w.ws.Context().Err())
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case <-ctx.Done():
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waitErr = fmt.Errorf("%w: %v", ErrContextDone, ctx.Err())
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}
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return
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}
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