SNI gRPC Code Generation

Snirk uses the gRPC interface provided by SNI. SNI includes proto files which describe the interfaces in protobuf (currently protobuf v3).

These files are used to generate the SNI python library code in snirk.sni.

gRPC code generation

The gRPC and protobuf interfaces to SNI in the snirk/sni/ directory were initially created using the protoc tool with grpc-tools python package from a checkout of the SNI repo (alttpo/sni).

However, the generated files did not pass flake8/mypy analysis, and were modified to pass, and fix imports to match the package structure.

Additionally, the git commit of alttpo/sni was found (via git rev-parse HEAD) and committed as snirk/sni/version.txt.

A tools/generate-sni-code.sh script is included to checkout the alttpo/sni repo in a temporary directory at this commit and generate the code in snirk/sni/. In the event of updated proto files, this can be re-run to generate new gRPC code.