Stubs & Skeletons:

[Stubs] :

• Generated on RPC client side
• Handles:
  • Serialization of data,
  • and Deserialization of responses.
• Triggers Skeletons

[Skeletons (Service Implementations)] :

• Method invoked on RPC server side
• Handles:
  • Deserialization of requests
  • Serialization of responses
• Responds to Subs

Steps (ref: Diagram as example)

Client Side [1] A REST call is made from the client (JSON usually)

[2-4]

• The order service (gRPC client) receives the REST call, transforms it, and
• Makes an RPC call to the payment service. gRPC encodes the client stub into a binary (protobuf)
• Format and sends it to the low-level transport layer.

[5]

• gRPC sends the packets over the network via [HTTP2].

Server side [6-8]

• The payment service (gRPC server) receives the packets from the network, decodes them, and invokes the server application.

[9 - 11]

• The result is returned from the server application, and gets encoded and sent to the transport layer.