Merge pull request #52 from NeedleInAJayStack/subscription

Subscription

Author: paulofaria

Package.resolved

@@ -15,8 +15,8 @@
         "repositoryURL": "https://github.com/GraphQLSwift/GraphQL.git",
         "state": {
           "branch": null,
-          "revision": "69f2cd4835ff60b5fae841a680abdc1d56592dd4",
-          "version": "1.1.7"
+          "revision": "abf41c20c79331444ee3a290373d7c647c244383",
+          "version": "1.2.0"
         }
       },
       {

Package.swift

@@ -7,7 +7,7 @@ let package = Package(
         .library(name: "Graphiti", targets: ["Graphiti"]),
     ],
     dependencies: [
-        .package(url: "https://github.com/GraphQLSwift/GraphQL.git", .upToNextMajor(from: "1.1.8")),
+        .package(url: "https://github.com/GraphQLSwift/GraphQL.git", .upToNextMajor(from: "1.2.0"))
     ],
     targets: [
         .target(name: "Graphiti", dependencies: ["GraphQL"]),

README.md

@@ -152,6 +152,16 @@ struct Resolver {
 }
 ```
 
+#### Subscription
+
+This library supports GraphQL subscriptions. To use them, you must create a concrete subclass of the `EventStream` class that implements event streaming
+functionality.
+
+If you don't feel like creating a subclass yourself, you can use the [GraphQLRxSwift](https://github.com/GraphQLSwift/GraphQLRxSwift) repository
+to integrate [RxSwift](https://github.com/ReactiveX/RxSwift) observables out-of-the-box. Or you can use that repository as a reference to connect a different 
+stream library like [ReactiveSwift](https://github.com/ReactiveCocoa/ReactiveSwift), [OpenCombine](https://github.com/OpenCombine/OpenCombine), or
+one that you've created yourself.
+
 ## Star Wars API example
 
 Check the [Star Wars API](Tests/GraphitiTests/StarWarsAPI/StarWarsAPI.swift) for a more complete example.

Sources/Graphiti/API/API.swift

@@ -25,4 +25,21 @@ extension API {
             operationName: operationName
         )
     }
+    
+    public func subscribe(
+        request: String,
+        context: ContextType,
+        on eventLoopGroup: EventLoopGroup,
+        variables: [String: Map] = [:],
+        operationName: String? = nil
+    ) -> EventLoopFuture<SubscriptionResult> {
+        return schema.subscribe(
+            request: request,
+            resolver: resolver,
+            context: context,
+            eventLoopGroup: eventLoopGroup,
+            variables: variables,
+            operationName: operationName
+        )
+    }
 }

Sources/Graphiti/Schema/Schema.swift

@@ -56,4 +56,27 @@ public extension Schema {
             return eventLoopGroup.next().makeFailedFuture(error)
         }
     }
+    
+    func subscribe(
+        request: String,
+        resolver: Resolver,
+        context: Context,
+        eventLoopGroup: EventLoopGroup,
+        variables: [String: Map] = [:],
+        operationName: String? = nil
+    ) -> EventLoopFuture<SubscriptionResult> {
+        do {
+            return try graphqlSubscribe(
+                schema: schema,
+                request: request,
+                rootValue: resolver,
+                context: context,
+                eventLoopGroup: eventLoopGroup,
+                variableValues: variables,
+                operationName: operationName
+            )
+        } catch {
+            return eventLoopGroup.next().makeFailedFuture(error)
+        }
+    }
 }