2019-08-16 17:13:04 +00:00
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package p2p
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2019-08-18 04:32:39 +00:00
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import (
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"bytes"
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2019-08-19 21:20:56 +00:00
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"context"
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2019-08-18 04:32:39 +00:00
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"reflect"
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"github.com/gogo/protobuf/proto"
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"github.com/pkg/errors"
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2019-09-29 18:48:55 +00:00
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"github.com/prysmaticlabs/prysm/shared/traceutil"
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"go.opencensus.io/trace"
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2019-08-18 04:32:39 +00:00
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)
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// ErrMessageNotMapped occurs on a Broadcast attempt when a message has not been defined in the
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// GossipTypeMapping.
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var ErrMessageNotMapped = errors.New("message type is not mapped to a PubSub topic")
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2019-08-16 17:13:04 +00:00
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// Broadcast a message to the p2p network.
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2019-08-19 21:20:56 +00:00
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func (s *Service) Broadcast(ctx context.Context, msg proto.Message) error {
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2019-09-29 18:48:55 +00:00
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ctx, span := trace.StartSpan(ctx, "p2p.Broadcast")
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defer span.End()
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2019-08-18 04:32:39 +00:00
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topic, ok := GossipTypeMapping[reflect.TypeOf(msg)]
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if !ok {
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2019-09-29 18:48:55 +00:00
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traceutil.AnnotateError(span, ErrMessageNotMapped)
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2019-08-18 04:32:39 +00:00
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return ErrMessageNotMapped
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}
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2019-09-29 18:48:55 +00:00
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span.AddAttributes(trace.StringAttribute("topic", topic))
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2019-08-18 04:32:39 +00:00
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buf := new(bytes.Buffer)
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if _, err := s.Encoding().Encode(buf, msg); err != nil {
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2019-09-29 18:48:55 +00:00
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err := errors.Wrap(err, "could not encode message")
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traceutil.AnnotateError(span, err)
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return err
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2019-08-18 04:32:39 +00:00
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}
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if err := s.pubsub.Publish(topic+s.Encoding().ProtocolSuffix(), buf.Bytes()); err != nil {
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2019-09-29 18:48:55 +00:00
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err := errors.Wrap(err, "could not publish message")
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traceutil.AnnotateError(span, err)
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return err
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2019-08-18 04:32:39 +00:00
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}
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return nil
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2019-08-16 17:13:04 +00:00
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}
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