schema {
  query: Query
  mutation: Mutation
  subscription: Subscription
}

type Channel {
  message: String!
  name: String!
}

type Mutation {
  publish(message: String!, name: String!): Channel
  publishFromBus(message: String!, name: String!): Channel
  unsubscribe(name: String!): Channel @aws_iam
}

type Query {
  getChannel: Channel
}

type Subscription {
  subscribe(name: String!): Channel @aws_subscribe(mutations : ["publishFromBus"])
}