Sisyphus is the way how we provide backend services. It integrates all tools and libraries needed for designing API which follows the Google API Improvement Proposals.

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Due to analyzing product documents completely, it is not particularly difficult to write an exquisite and easy-to-use API at the beginning for most APIs.

However, many people will break the initial design of the API in the endless updates of products.

It's hard to create a strong and extensible API in the whole project lifetime, just like rolling a huge boulder endlessly up a steep hill.

So we need an all-encompassing guide book to guide us in creating, updating, and modifying APIs.

The Google API Improvement Proposals is the all-encompassing guide book. Google created it in their rich and extensive API design experience. It laid the foundation for anyone to create an extensible API.

Choosing good tools can help you 'rolling a huge boulder' faster and easier. Sisyphus provides and integrates many tools in your 'boulder rolling' route.

Kotlin is our target language. The mature JVM community and concise grammar are the reasons.

Spring boot is our old friend to manage and organize our components.

gRPC is our target API framework. Sisyphus also provides the HTTP and gRPC Transcoding component for the environment which isn't compatible with gRPC.

Sisyphus JS is our customized protobuf and gRPC runtime for Javascript/Typescript.

Sisyphus Protobuf is our customized protobuf runtime, which designed for Kotlin.

Sisyphus gRPC Coroutine is our customized gRPC stub runtime, which designed for Kotlin coroutine.

Sisyphus gRPC RxJava is our customized gRPC stub runtime, which designed for RxJava2(Client only, design for Android).

Sisyphus DTO is the way how we create struct without protobuf.

Sisyphus Test is the way how we test our gRPC API by data-driven.

Sisyphus Middleware is the way how we connect Sisyphus and other systems.

Sisyphus Configuration Artifact is the way how we manage configurations and developing environment.

Sisyphus Kubernetes gRPC client is the way how we implement service discovery in Kubernetes.

Sisyphus Protobuf Compiler is the way how we generate Kotlin codes by .proto files.

Sisyphus Project Plugin is the way how we manage project and configuring Gradle.

Sisyphus Protobuf Plugin is the way how we generate code by .proto files in Gradle.

And More tools like CEL(Common Expression Language) , Filtering and Ordering scripts will help you to design APIs following Google AIP.

Ready to rolling boulder with Sisyphus already? Hold on! We need to plan our route first.

1. System requirement

   • Gradle 6.7+
   • JDK 11+

2. Configure Sisyphus with gradle.properties

   We use gradle.properties to configure global settings of Sisyphus and all Sisyphus projects.

   # [DEV,RT] Set developer name for developing environment.
   sisyphus.developer=higan
   # [DEV] Set development layer for replacing version of dependencies, could be 'API', 'PLATFORM', 'FRAMEWORK'.
   sisyphus.layer=FRAMEWORK
   # [RT] Set environment for configuration artifact.
   sisyphus.environment=production
   
   # Use 'sisyphus.repository.<name>.url' Register maven repository for Sisyphus usage.
   # [DEV,RT] Url of repository named 'snapshot'.
   sisyphus.repositories.snapshot.url=https://repo1.maven.org/maven2/
   # [DEV,RT] Optional, user name of repository.
   sisyphus.repositories.snapshot.username=
   # [DEV,RT] Optional, password of repository.
   sisyphus.repositories.snapshot.password=
   
   # Repositories for different usage, there are 4 embedded repositories.
   # 'local'(maven local), 'central'(maven central), 'portal'(gradle portal).
   
   # [DEV,RT] Repositories for resolving dependencies, default value is 'local,central,portal'.
   sisyphus.dependency.repositories=local,central,portal
   # [DEV] Repositories for snapshot publishing, default value is 'snapshot'.
   sisyphus.snapshot.repositories=snapshot
   # [DEV] Repositories for release publishing, default value is 'release'.
   sisyphus.release.repositories=release
   # [DEV] Repositories for docker publishing.
   sisyphus.docker.repositories=
   
   # [RT] Configuration artifacts, it will be resolved in runtime.
   sisyphus.config.artifacts=foo.bar:baz:1.0.0

   [DEV] for developing environment properties.

   [RT] for runtime environment properties.

   gradle.properties are shared between Gradle and Spring. Sisyphus Project Plugin will load them and configure Gradle automatically. Sisyphus Configuration Artifact will load them for Spring Framework.

3. Write Protobuf schemas

   The next step is to design APIs, which means to create a schema project and to write .proto files in this project.

   This is a sample schema project build.gradle.kts config.

   plugins {
       `java-library` // We build this project as a java library.
       kotlin("jvm") version "1.3.72" // Use the kotlin plugin to compile .kt files
       id("com.bybutter.sisyphus.project") version "1.2.2" // Use the sisyphus project management plugin.
       id("com.bybutter.sisyphus.protobuf") version "1.2.2" // Use the sisyphus protobuf compiler plugin.
   }
   
   dependencies {
       api("com.bybutter.sisyphus:sisyphus-grpc-coroutine:1.2.2") // Dependent on sisyphus grpc runtime.
       /*proto("com.foo.bar:baz:1.0.0")*/ // Use 'proto' configuration to config jars need to compile proto.
       /*protoApi("com.foo.bar:baz:1.0.0")*/ // Use 'protoApi' configuration to config needed jars in proto compiling.
       // All dependencies in 'implementation' configuration will auto add to 'protoApi' configuration.
   }

   Now we can write .proto files in src/main/proto folder.

   syntax = "proto3";
   
   option java_multiple_files = true;
   option java_package = "com.bybutter.sisyphus.examples.helloworld";
   
   package sisyphus.examples.helloworld;
   
   import "google/api/annotations.proto";
   
   // The greeting api definition.
   service GreetingApi {
     // Sends a greeting
     rpc Greet (GreetRequest) returns (GreetResponse) {
       option (google.api.http) = {
           post: "/v1:greet"
           body: "*"
       };
     }
   }
   
   // The request message containing the user's name.
   message GreetRequest {
     string name = 1;
   }
   
   // The response message containing the greetings
   message GreetResponse {
     string message = 1;
   }

   Additionally, kotlin and java classes are able to be added to schema project too. However, we do not recommend anything like this added excluding util or helper classes.

   Use the gradlew generateProtos task to generate kotlin files from proto files.

4. Implement API

   API schema is ready now. The next step is to implement this API schema. Create a service project and refer to the schema project.

   This is a sample service project build.gradle.kts config.

   plugins {
       `java-library`
       kotlin("jvm") version "1.3.72"
       id("com.bybutter.sisyphus.project") version "1.2.2"
   }
   
   dependencies {
       api("com.bybutter.sisyphus.middleware:sisyphus-grpc-client:1.2.2") // Dependent on spring grpc runtime.
       api(project("schema:example-schema")) // Dependent on schema project.
   }

   Create spring auto-config for service project.

   @Configuration
   @ComponentScan(basePackageClasses = [AutoConfig::class])
   class AutoConfig

   Register auto-config in src/main/resources/META-INF/spring.factories.

   org.springframework.boot.autoconfigure.EnableAutoConfiguration=com.bybutter.sisyphus.examples.helloworld.AutoConfig

   Write the implementation by extend generated service classes.

   @RpcServiceImpl
   class GreetingApiImpl : GreetingApi() {
       override suspend fun greet(input: GreetRequest): GreetResponse {
           return GreetResponse {
               message = "Hello ${input.name}!"
           }
       }
   }

5. Run the Application

   The service project is just a non-runnable library. We need to create an application project to run our service projects.

   This is a sample application project build.gradle.kts config.

   plugins {
       application
       kotlin("jvm") version "1.3.72"
       `kotlin-spring`
       id("com.bybutter.sisyphus.project") version "1.2.2"
   }
   
   dependencies {
       implementation("com.bybutter.sisyphus.starter:sisyphus-grpc-server-starter:1.2.2") // Dependent on spring grpc starter.
       implementation("com.bybutter.sisyphus.starter:sisyphus-grpc-transcoding-starter:1.2.2") // [Optional] Enable the http-transcoding feature.
       implementation("com.bybutter.sisyphus.starter:sisyphus-protobuf-type-server-starter:1.2.2") // [Optional] Enable the type server feature.
       implementation(project("service:example-service")) 	// Dependent on service project.
   }

   We only need one function in the application project, the main function.

   @SpringBootApplication
   @EnableHttpToGrpcTranscoding
   class MarcoApplication
   
   fun main(args: Array<String>) {
       SpringApplication.run(MarcoApplication::class.java, *args)
   }

   Use the gradlew bootRun task to run our application.