Merge branch 'feature/improved-error-handling' into 'master'

Improved Error Logging

See merge request PassiveLogic/platform/graphqlws!2

Author: NeedleInAJayStack

Sources/GraphQLWS/GraphQLWSError.swift

@@ -1,4 +1,5 @@
 // Copyright (c) 2021 PassiveLogic, Inc.
+import GraphQL
 
 struct GraphQLWSError: Error {
     let message: String
@@ -72,9 +73,9 @@ struct GraphQLWSError: Error {
         )
     }
 
-    static func internalAPIStreamIssue() -> Self {
+    static func internalAPIStreamIssue(errors: [GraphQLError]) -> Self {
         return self.init(
-            "API Response did not result in a stream type",
+            "API Response did not result in a stream type, contained errors\n\(errors.map { $0.message}.joined(separator: "\n"))",
             code: .internalAPIStreamIssue
         )
     }

Sources/GraphQLWS/Server.swift

@@ -155,7 +155,7 @@ public class Server {
             subscribeFuture.whenSuccess { result in
                 guard let streamOpt = result.stream else {
                     // API issue - subscribe resolver isn't stream
-                    self.error(.internalAPIStreamIssue())
+                    self.error(.internalAPIStreamIssue(errors: result.errors))
                     return
                 }
                 let stream = streamOpt as! ObservableSubscriptionEventStream