/
broadcaster.go
58 lines (47 loc) · 1.3 KB
/
broadcaster.go
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package nats
import (
"context"
"github.com/nats-io/nats.go"
"github.com/vectrum-io/strongforce/pkg/bus"
"go.opentelemetry.io/otel/propagation"
"go.uber.org/zap"
)
type Broadcaster struct {
jetStream nats.JetStreamContext
logger *zap.SugaredLogger
otelPropagator propagation.TextMapPropagator
}
type BroadcasterOptions struct {
NATSAddress string
Logger *zap.SugaredLogger
OTelPropagator propagation.TextMapPropagator
}
func NewBroadcaster(opts *BroadcasterOptions) (*Broadcaster, error) {
nc, err := nats.Connect(opts.NATSAddress)
if err != nil {
return nil, err
}
js, err := nc.JetStream(nats.PublishAsyncMaxPending(256))
if err != nil {
return nil, err
}
return &Broadcaster{
jetStream: js,
logger: opts.Logger,
otelPropagator: opts.OTelPropagator,
}, nil
}
func (nb *Broadcaster) Broadcast(ctx context.Context, message *bus.OutboundMessage) error {
nb.logger.Debugf("Broadcasting event to %+v", message.Subject)
headers := nats.Header{}
// inject otel metadata into nats message headers
if nb.otelPropagator != nil {
nb.otelPropagator.Inject(ctx, propagation.HeaderCarrier(headers))
}
_, err := nb.jetStream.PublishMsg(&nats.Msg{
Header: headers,
Subject: message.Subject,
Data: message.Data,
}, nats.MsgId(message.Id))
return err
}