Add coprocessor yaml and fix context in subs subgraph

Author: brh55

final/nosql-products/src/index.js

@@ -72,12 +72,15 @@ async function main() {
             };
           },
         },
-      ],
-    context: async ({ req }) => new ContextValue({ req, server })
+      ]
   });
 
   await server.start();
-  app.use("/", cors(), json(), expressMiddleware(server));
+  app.use("/", cors(), json(), expressMiddleware(server,
+    {
+      context: async ({ req }) => new ContextValue({ req, server })
+    }
+  ));
 
   httpServer.listen(port, () => {
     console.log(`🚀 Subgraph ready at http://localhost:${port}/`);

router/router.yaml

@@ -40,9 +40,11 @@ subscription:
        subgraphs:
         products:
          path: /
-# This is a top-level key. It MUST define at least one of the two
-# sub-keys shown, even if you don't modify its default value.
-# rhai:
-#   # Specify a different Rhai script directory path with this key.
-#   # The path can be relative or absolute.
-#   scripts: "/dist/rhai/scripts"
+
+# Co Processor
+coprocessor:
+  url: https://coprocessor-wn3vwa6nlq-ue.a.run.app # Required. Replace with the URL of your coprocessor's HTTP endpoint.
+  timeout: 2s # The timeout for all coprocessor requests. Defaults to 1 second (1s)
+  router: # This coprocessor hooks into the `RouterService`
+    response: # By including this key, the `RouterService` sends a coprocessor request whenever it first receives a client request.
+      body: true # By including this key the co-processor can modify the body of the response