Subscriptions
Sometimes you need to not only query data from a server, but you also want to push data
from the server to the client. GraphQL-core 3 has you also covered here, because it
implements the “Subscribe” algorithm described in the GraphQL spec. To execute a GraphQL
subscription, you must use the subscribe()
method from the
graphql.execution
package. Instead of a single
ExecutionResult
, this function returns an asynchronous
iterator yielding a stream of those, unless there was an immediate error.
Of course you will then also need to maintain a persistent channel to the client
(often realized via WebSockets) to push these results back.
Other Usages
GraphQL-core 3 provides many more low-level functions that can be used to work with
GraphQL schemas and queries. We encourage you to explore the contents of the various
Sub-Packages, particularly graphql.utilities
, and to look into the source
code and tests of GraphQL-core 3 in order to find all the functionality that is
provided and understand it in detail.