Feature Request: Add gRPC Protocol Support for Load Testing

[electroma]

Our organization is migrating high-traffic services from JSON-over-HTTP to gRPC, and we currently cannot use our existing Artillery test suites for these services. I'd like to request native gRPC support in Artillery to maintain our performance testing capabilities during this transition.

Use Cases:

1. Load testing gRPC services with the same ease as HTTP endpoints
2. Support for unary RPC calls
3. Support for server-streaming, client-streaming, and bidirectional-streaming RPCs
4. Ability to reuse existing protobuf definitions
5. Performance metrics collection specific to gRPC calls

[hassy]

It'd be pretty straightforward to add support for unary calls, but streaming-related logic is harder to express in YAML. You'd probably end up needing to drop into JS/TS via hooks a lot.

You may be better off just using a Node.js gRPC client you're already using & wrapping it with Artillery's extension APIs for tracking & reporting metrics. This should give you everything:

• Ability to implement complex logic for your tests
• gRPC-related metrics tracked via metrics API will be reported in console reports and in Artillery Cloud
• Distributed load tests - Artillery should pick up all gRPC-related dependencies automatically

We have an example that shows how a Twirp (another RPC protocol) service can be tested with Artillery this way: https://github.com/artilleryio/artillery/tree/main/examples/rpc-twirp-with-custom-function