gqlserver2: dataloaders3

dataloaders.go

// Retriever retrieves dataloaders from the request context.
type Retriever interface {
	Retrieve(context.Context) *Loaders
}

type retriever struct {
	key contextKey
}

func (r *retriever) Retrieve(ctx context.Context) *Loaders {
	return ctx.Value(r.key).(*Loaders)
}

// NewRetriever instantiates a new implementation of Retriever.
func NewRetriever() Retriever {
	return &retriever{key: key}
}