Protobuf in Elixir

Protox is a great library to allow Protobuf to be used in Elixir.
While developing a span catcher for OpenTelemetry I found that I needed to decode a protobuf format message.

Here is the repo if you are interested:

To construct the protobuf file I looked at the readme of opentelemetry_exporter, which pointed me to the protobuf definitions:

I chose to simplify these into a single file (it’s not that large).

Protobuf is a wire format serializer. This means that if you send a Protobuf message any language that can use protobuf can read the message (provided that both side have the definition).

Given that this proto file has been implemented by a number of OpenTelemetry consumers it can be assumed to be stable.

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