vend / opendog

A hacky translation layer that converts Datadog traces into OpenTelemetry Protobufs for use with Jaeger All In One

Opendog

A hacky translation layer that converts Datadog traces into OpenTelemetry Protobufs for use with Jaegar

It's not perfect and there is a bunch of stuff to be implemented and tidied up but it's good enough to pipe Datadog traces locally into Jaegar All In One

Usage

$ go run .
2022/12/10 23:01:45 Opendog is listening on 127.0.0.1:8126
2022/12/10 23:01:46 Succesfully converted and forwarded 2 spans
2022/12/10 23:01:46 Succesfully converted and forwarded 2 spans

Your Datadog APM client will automatically connect if it is running on localhost.

If you'd like to point a container at it using Docker, you can set the following environment variable against your container:

• Windows/macOS: DD_AGENT_HOST=host.docker.internal
• Linux: DD_AGENT_HOST=172.17.0.1

Eventually it'll be packaged up properly, provide a docker container etc etc

Variables

There are two environment variables that can be used for configuring Opendog

Name	Default Value	Notes
COLLECTOR_ADDRESS	http://localhost:4318/v1/traces	The address to send gRPC payloads to. In this case, 4318 is the OTel endpoint used by Jaeger.
PORT	8126	The address to receive traces on. In this case, 8126 is the default traces port for the Datadog agent (aka statsd)

Example of Datadog traces piped into Jaegar

Running Jaegar All In One

A reminder to myself because I'm going to forget

$ docker run -d --name jaeger \
  -e COLLECTOR_ZIPKIN_HOST_PORT=:9411 \
  -e COLLECTOR_OTLP_ENABLED=true \
  -p 6831:6831/udp \
  -p 6832:6832/udp \
  -p 5778:5778 \
  -p 16686:16686 \
  -p 4317:4317 \
  -p 4318:4318 \
  -p 14250:14250 \
  -p 14268:14268 \
  -p 14269:14269 \
  -p 9411:9411 \
  jaegertracing/all-in-one:1.39

opendog's Issues

Handle W3C TraceContext

Now that Datadog's APM client libraries are starting to support W3C TraceContext as the new default, Opendog should add support for handling this.

Ideally, it would also support B3 as well, since that's a valid format (both normal and single header)