Game DGS Federation

Demo application of using DGS framework together with Apollo Federation Server.

The repository contains three dgs microservices:

• game-dgs: Spring Boot GraphQL service providing the federated Game type.
• user-dgs: Spring Boot GraphQL service providing the federated User type.
• review-dgs: Spring Boot GraphQL service extending Game and User type with Review.

And a apollo-gateway acting as the Federated Gateway connecting the three microservices.

The image below summarize the relation between them:

How to Run

1. Start game-dgs by running the Spring Boot app from an IDE or mvn spring-boot:run.
2. Start user-dgs by running the Spring Boot app from an IDE or mvn spring-boot:run.
3. Start review-dgs by running the Spring Boot app from an IDE or mvn spring-boot:run.
4. Run npm install in apollo-gateway and then npm run server.
5. Open http://localhost:4000 in the GraphQL Playground.

Example Queries

The following federated queries should work when all microservices are up:

{
  games {
    name
    releaseYear
    reviews {
      comment
      starRating
    }
  }
}

{
  users {
    username
    reviews {
      comment
      starRating
    }
  }
}

{
  reviews {
    comment
    starRating
    game {
      name
    }
    user {
      username
    }
  }
}

References

• Apollo Federation
• DGS Framework

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Made by Lucas Reis