Adding examples of communicating with the user via events and conditi…

…ons.

Signed-off-by: dalton hill <[email protected]>

content/v1.17/guides/write-a-composition-function-in-go.md

@@ -298,6 +298,18 @@ func (f *Function) RunFunction(_ context.Context, req *fnv1.RunFunctionRequest)
 	// to add desired managed resources.
 	xr, err := request.GetObservedCompositeResource(req)
 	if err != nil {
+		// You can set a custom status condition on the claim. This
+		// allows you to communicate with the user.
+		response.ConditionFalse(rsp, "FunctionSuccess", "InternalError").
+			WithMessage("Something went wrong.").
+			TargetCompositeAndClaim()
+
+		// You can emit an event regarding the claim. This allows you to
+		// communicate with the user. Note that events should be used 
+		// sparingly and are subject to throttling
+		response.Warning(rsp, errors.New("something went wrong")).
+			TargetCompositeAndClaim()
+
 		// If the function can't read the XR, the request is malformed. This
 		// should never happen. The function returns a fatal result. This tells
 		// Crossplane to stop running functions and return an error.
@@ -388,6 +400,11 @@ func (f *Function) RunFunction(_ context.Context, req *fnv1.RunFunctionRequest)
 	// Kubernetes events associated with the XR it's operating on.
 	log.Info("Added desired buckets", "region", region, "count", len(names))
 
+	// You can set a custom status condition on the claim. This allows you
+	// to communicate with the user.
+	response.ConditionTrue(rsp, "FunctionSuccess", "Success").
+		TargetCompositeAndClaim()
+
 	return rsp, nil
 }
 ```