The document discusses the advantages of building microservices using gRPC compared to REST APIs, highlighting gRPC's high performance, use of HTTP/2, and Protobuf for message format. It outlines the steps for writing a gRPC service, including service definition, code generation, and implementation. Additionally, it provides useful links for further resources on gRPC and Protobuf.

1. Building Microservices with
gRPC
Sathya
Software Developer @ MoneySmart

2. REST APIs
● Well defined HTTP verbs
● JSON objects can be consumed by JavaScript easily.
● cURL friendly.
● Matured HTTP client libraries support in major languages.

3. Is it suitable for Microservices?

4. Not everything is a resource
Calculator Service

5. Manual Stub Code

6. Other problems
● Maintenance of the API documentation.
● JSON is text based which added unnecessary burden to the performance when serializing and
deserializing data.

7. gRPC

8. gRPC
● High performance RPC system.
● Uses HTTP/2 for transport.
● Uses ProtoBuf as Message Format.
● Supports different modes such as unary and bidirectional streaming.
● Ability to Cancel or Timeout requests.

9. ProtoBuf
● Mechanism for serializing structured data
● Binary Message Format
● For describing both service interface and message
structure
Advantages:
1. Better Performance
2. Easy to read Service and Message Definition
3. Able to generate Stub Classes Programmatically

10. Benefits of gRPC
1. Proto files itself act as the service documentation.
2. Automatic code generation for stubs by using proto compilers.
3. Better Performance by using HTTP/2 for transport and protobuf for serializing

11. Writing gRPC service
Steps:
1. Write Service Definition in Proto file format.
2. Generate Client / Server code using proto compiler.
3. Implement the Server by extending the generated server code.
4. Implement the Client by calling methods using the generated Client Stub.

12. Questions???

13. Useful Links
● https://grpc.io/
● https://developers.google.com/protocol-buffers/docs/proto3
● https://github.com/bigcommerce/gruf
● http://avi.im/grpc-errors/#ruby
● https://github.com/avinassh/grpc-errors

14. www.moneysmart.co/jobs