Investigations on creating/parsing gRPC messages from CEL

[alexsnaps]

The Kuadrant SDK is used to coordinate all of these:

• Message creation: CheckRequest { foo: request.headers['x-foo'] }
• Message sending (to where?)
  • Should it use gRPC reflection/introspection to "validate" the format?
• Response Message parsing
• Conditionally do things based on that response allowPredicate: MessageResponse.bar == 42

[KevFan]

Playground repo - https://github.com/KevFan/cel-grpc