private static void Inject <TMessageRequest>(SpanContext context, IDictionary messageAttributes)
{
// Consolidate headers into one JSON object with <header_name>:<value>
var sb = Util.StringBuilderCache.Acquire(Util.StringBuilderCache.MaxBuilderSize);
sb.Append('{');
SpanContextPropagator.Instance.Inject(context, sb, default(StringBuilderCarrierSetter));
sb.Remove(startIndex: sb.Length - 1, length: 1); // Remove trailing comma
sb.Append('}');
var resultString = Util.StringBuilderCache.GetStringAndRelease(sb);
messageAttributes[SqsKey] = CachedMessageHeadersHelper <TMessageRequest> .CreateMessageAttributeValue(resultString);
}
public static void InjectHeadersIntoMessage <TMessageRequest>(IContainsMessageAttributes carrier, SpanContext spanContext)
{
// add distributed tracing headers to the message
if (carrier.MessageAttributes == null)
{
carrier.MessageAttributes = CachedMessageHeadersHelper <TMessageRequest> .CreateMessageAttributes();
}
// SQS allows a maximum of 10 message attributes: https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-message-metadata.html#sqs-message-attributes
// Only inject if there's room
if (carrier.MessageAttributes.Count < 10)
{
Inject <TMessageRequest>(spanContext, carrier.MessageAttributes);
}
}