GraphQL Test Server

This project is a sample project, showing how to run the cosmos router with multiple GraphQL servers.

The main server (in user_server) is a simple GraphQL server built using Go and gqlgen. It provides an API to manage users with the following fields:

• id: Unique identifier for the user.
• email: The user's email address.
• first_name: The user's first name.
• last_name: The user's last name.
• full_name: A computed field that concatenates the first name and last name.

The second server (in user_age_server) is a super simple GraphQL server that extends the model by adding age

The third directory (cosmos_router) contains the router configuration for running the server

Features

• Query Users: Fetch a list of users with optional filtering by first name and ordering by email.
• Create User: Add a new user to the list.
• Delete User: Remove a user by their ID.

All user data is stored in memory, so it will be lost when the server restarts.

Getting Started

Prerequisites

• Go (version 1.16 or later)
• gqlgen

Running

1. Clone the repository:
2. Install dependencies:

   go mod tidy

3. Run tests:

   go test ./...

4. Run all 3 servers at the same time (in 3 tabs):

   go run user_server/server.go
   go run user_age_server/server.go
   cd cosmos_router && ./router

Testing the API

You can test the API using GraphQL Playground, Postman, or any other GraphQL client.

Example Queries

• Get a list of users:

query {
  users {
    id
    email
    full_name
     age
  }
}

• Filter users by first name

query {
  users(first_name: "John") {
    id
    email
    full_name
  }
}

• Order users by email

query {
  users(orderByEmail: true) {
    id
    email
    full_name
  }
}

Example Mutations

• Create a new user:

mutation {
  createUser(input: { email: "john.doe@example.com", first_name: "John", last_name: "Doe" }) {
    id
    full_name
  }
}

• Delete a user:

mutation {
  deleteUser(id: "U1")
}

Acknowledgments

gqlgen - A Go library for building GraphQL servers.