GraphQL { functions { call } } generic mutation (#5818)

* Generic call function mutation
* Change function return type to any
* First passing test
* Testing errors
* Testing different data types

src/GraphQL/loaders/functionsMutations.js

@@ -0,0 +1,57 @@
+import { GraphQLObjectType, GraphQLNonNull, GraphQLString } from 'graphql';
+import { FunctionsRouter } from '../../Routers/FunctionsRouter';
+import * as defaultGraphQLTypes from './defaultGraphQLTypes';
+
+const load = parseGraphQLSchema => {
+  const fields = {};
+
+  fields.call = {
+    description:
+      'The call mutation can be used to invoke a cloud code function.',
+    args: {
+      functionName: {
+        description: 'This is the name of the function to be called.',
+        type: new GraphQLNonNull(GraphQLString),
+      },
+      params: {
+        description: 'These are the params to be passed to the function.',
+        type: defaultGraphQLTypes.OBJECT,
+      },
+    },
+    type: defaultGraphQLTypes.ANY,
+    async resolve(_source, args, context) {
+      try {
+        const { functionName, params } = args;
+        const { config, auth, info } = context;
+
+        return (await FunctionsRouter.handleCloudFunction({
+          params: {
+            functionName,
+          },
+          config,
+          auth,
+          info,
+          body: params,
+        })).response.result;
+      } catch (e) {
+        parseGraphQLSchema.handleError(e);
+      }
+    },
+  };
+
+  const functionsMutation = new GraphQLObjectType({
+    name: 'FunctionsMutation',
+    description:
+      'FunctionsMutation is the top level type for functions mutations.',
+    fields,
+  });
+  parseGraphQLSchema.graphQLTypes.push(functionsMutation);
+
+  parseGraphQLSchema.graphQLMutations.functions = {
+    description: 'This is the top level for functions mutations.',
+    type: functionsMutation,
+    resolve: () => new Object(),
+  };
+};
+
+export { load };