awstrace

Documentation

Overview

Package awstrace contains aws session wrapper for tracing through SNS and SQS supporting Datadog native and B3 tracing contexts.

Examples

An example of tracing between two services through SQS

Using WrapSession, service 1

func sendMessage(msg string) error {
	// Pass trace headers by wrapping the session with WrapSession
	sess := session.Must(session.NewSession())
	sess = awstrace.WrapSession(sess)

	// Context need to containing Datadog or B3 trace for this to work
	ctx, span := oc_trace.StartSpan(ctx, "example")
	defer span.End()

	// Sending message and injecting tracing headers
	client := sqs.New(sess)
	_, err := client.SendMessageWithContext(ctx, &sqs.SendMessageInput{
		MessageBody: aws.String(msg),
	})
	return err
}

Using StartDatadogSpanFromMessage, service 2

func handleRecord(ctx context.Context, record *sqs.SQSMessage) {
	// Creating a new datadog span and extracing the trace headers
	span, ctx = awstrace.StartDatadogSpanFromMessage(ctx, serviceName, record)
	defer span.Finish()

	...
}

Index

• func StartDatadogSpanFromMessage(ctx context.Context, serviceName string, msg events.SQSMessage) (dd_tracer.Span, context.Context)
• func WrapSession(sess *session.Session) *session.Session

Functions

func StartDatadogSpanFromMessage

func StartDatadogSpanFromMessage(ctx context.Context, serviceName string, msg events.SQSMessage) (dd_tracer.Span, context.Context)

StartDatadogSpanFromMessage will start a Datadog span based on message attributes found in sqs message. It will extract trace and span id either depending on the extraction style. Configure the extraction style by using the environment variable: DD_PROPAGATION_STYLE_EXTRACT=Datadog,B3 Default extraction style is set to Datadog

func WrapSession

func WrapSession(sess *session.Session) *session.Session

WrapSession will wrap the AWS session and injecting tracing headers into the outgoing requests for these functions: - sns.PublishWithContext(...) - sqs.SendMessageWithContext(...) - sqs.SendMessageBatchWithContext(...) the wrapper support B3 and Datadog