dgraph-lambda-go

dgraph-lambda-go

Go Library written to build Dgraph Lambda servers as an alternative to the Dgraph JS Lambda Server

Getting started

• To install gqlgen run the command go get github.com/schartey/dgraph-lambda-go in your project directory.
• Then initialize the project by running go run github.com/schartey/dgraph-lambda-go init.

Implement resolver functions and middleware

On startup this library provides a resolver.

err := api.RunServer(func(r *resolver.Resolver, gql *graphql.Client, dql *dgo.Dgraph) {

})

Within this startup function you can provide resolver functions and middleware. It's best to first define the input structs for the resolver. For example CreateUserInput struct

type CreateUserInput struct {
	Username string `json:"username"`
}

Then you can provide a resolver like this

r.ResolveFunc("Mutation.createUser", func(ctx context.Context, input []byte, ah resolver.AuthHeader) ([]byte, error) {
    var createUserInput CreateUserInput
    json.Unmarshal(input, &createUserInput)

    // Do Something

    resp := `
    {
        "id": "0x1"	
    }`
    return ([]byte)(resp), nil
})

You can also provide middleware

r.Use(func(hf resolver.HandlerFunc) resolver.HandlerFunc {
    return func(c context.Context, b []byte, ah resolver.AuthHeader) ([]byte, error) {
        // For example authentication.
        // Add user to context
        return b, nil
    }
})

r.UseOnResolver("Mutation.createUser", func(hf resolver.HandlerFunc) resolver.HandlerFunc {
    return func(c context.Context, b []byte, ah resolver.AuthHeader) ([]byte, error) {
        // For example authentication.
        // Add user to context
        return b, nil
    }
})

Additionally a graphql and dql client connected to the dgraph server are provided, so you can query and make changes to the databases.

Examples

Further Examples