Snowtooth Federation Lab

Snowtooth Mountain lift ops team has created a Lift service that provides lift status reporting for skiers and the ability to change the lift status for ski patrollers. The mountain ops team has created their own service to report on Trail status. These are completely separate GraphQL API's, and it is our job to turn them into federated apis that work under one gateway.

Challenge 1: Create Federated Services

We have two services that run independently of one another on two different endpoints. We need to take these services and make them apollo federated services so that they can run behind a federated gateway.

Challenge 2: Create a Gateway

Now that we have federated services, we need to access them both from a single endpoint. Create a gateway services that allows me to query allLifts and allTrails from the same endpoint. The following query should work when sent to the gateway:

query {
  allLifts {
    id
    name
  }
  allTrails {
    id
    name
  }
}

Challenge 3: Extend the Trail Entity

From the lifts service, we need to extend the Trail entity. Add a field to Trail called liftAccess and resolve the lift types that access that trail. Hint: the data for each lift contains a trails array. Once complete the following query should work form the gateway:

query {
  allTrails {
    id
    name
    liftAccess {
      id
      name
      status
    }
  }
}

Challenge 4: Resolve external Trails

From the lifts service, we need to extend the Lift type to resolve Trail entities. The following query should work from the gateway:

query {
  allLifts {
    id
    name
    trailAccess {
      name
      difficulty
      status
    }
  }
}

Challenge 5: Add easiest Trail to Lift Service

The mountain ops team wants to provide an easyWayDown field for every lift so skiers will know the easiest route to the bottom no matter what lift they are on. The trail services has an algorithm for this, so we need to add an easyWayDown field to Lift entity from the trail service.

query {
  allLifts {
    id
    name
    easyWayDown {
      name
      difficulty
      status
    }
  }
}