gRPC compatibility with new APIs

[mslabko]

As a developer, I want to expose my APIs using gRPC protocol which provides unprecedented performance.

Since gRPC compatible interfaces/classes are generated using an external tool, code generation from https://github.com/magento/module-grpc should be eliminated.

AC:

• Product and Category storefront APIs are exposed using gRPC protocol (locally).
  • Product by ID endpoint is able to return product name
  • Category by ID endpoint is able to return category name
• gRPC server uses https://github.com/magento/module-grpc library
  • Code generation command from https://github.com/magento/module-grpc is removed
  • we don't need generation due to Service already have pre-generated classed (CatalogStorefrontAPI)
  • ./vendor/bin/grpc-server - run service (Accept only one service, ideally have configuration for this)
• Dependencies on unnecessary gRPC libraries in https://github.com/magento/module-grpc are eliminated
• Document all new flows, installation instructions, etc in readme files
• GQL resolver handle errors received from Storefront
  • Storefront can return "exception 'No product with id X'" but GQL should handle this error separately

Note: need to check if this story is in progress by performance team.

[m2-assistant[bot]]

Hi @mslabko. Thank you for your report. To help us process this issue please make sure that you provided sufficient information.

Please, add a comment to assign the issue: @magento I am working on this

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[kokoc]

Notes:

• Repeated field are not cast to arrays in the mapping
• compiled proto file required for rr-grpc is missing in the package

[mslabko]

What needs to be done to have gRPC communication between GQL & SF API

• gRPC server for Storefront Application
  • Stateful application with Roadrunner for Storefront Application
  • gRPC server uses https://github.com/magento/module-grpc library
• GQL server (nodejs) send gRPC request to SF API
• setup gRPC server on Cloud (P.SH)
• setup gRPC server on Jenkins
• setup GraphQL server (nodejs) on Jenkins

[mslabko]

We can use docker image "zabaz/php:7.4-proto" which come with "protobuf" extension

But I think this is not required for test porpouse:

To achieve higher performance on larger messages, make sure to install a protobuf extension for PHP.

[mslabko]

Closed in favor of https://jira.corp.magento.com/browse/SFAPP-77