raymondtay / sangria-akka-http-cassandra

Querying Cassandra via Sangria (a GraphQL implementation)

Sangria akka-http Cassandra Example

Note: Inspired from Oleg Ilyenko's original repo where Oleg demonstrated how Sangria can be integrated with Akka Http which the GQL can be offered as a service.

This repo simply rides ontop of that by demonstrating how the querying can be lifted from Cassandra. Caution : this example is for demonstration purposes only.

An example GraphQL server written with akka-http and sangria.

After starting the server with

sbt run

you can run queries interactively using GraphiQL by opening http://localhost:8080 in a browser or query the /graphql endpoint. It accepts following properties in the JSON body (this follows relay convention):

• query - String - GraphQL query as a string
• variables - Object or String containing a JSON object that defines variables for your query (optional)
• operationName - String - the name of the operation, in case you defined several of them in the query (optional)

Here are some examples of the queries you can make:

$ curl -X POST localhost:8080/graphql \
    -H "Content-Type:application/json" \
    -d '{"query": "{hero {name, friends {name}}}"}'

this gives back the hero of StarWars Saga together with the list of his friends, which is of course R2-D2:

{
  "data": {
    "hero": {
      "name": "R2-D2",
      "friends": [
        {
          "name": "Luke Skywalker"
        },
        {
          "name": "Han Solo"
        },
        {
          "name": "Leia Organa"
        }
      ]
    }
  }
}

Here is another example, which uses variables:

$ curl -X POST localhost:8080/graphql \
    -H "Content-Type:application/json" \
    -d '{"query": "query Test($humanId: String!){human(id: $humanId) {name, homePlanet, friends {name}}}", "variables": {"humanId": "1000"}}'

The result should be something like this:

{
  "data": {
    "human": {
      "name": "Luke Skywalker",
      "homePlanet": "Tatooine",
      "friends": [
        {
          "name": "Han Solo"
        },
        {
          "name": "Leia Organa"
        },
        {
          "name": "C-3PO"
        },
        {
          "name": "R2-D2"
        }
      ]
    }
  }
}