test(policy): Reduce duplication in outbound policy API tests (#13543)

This change refactors the outbound policy API integration tests to reduce duplication and to be more principled about what combinations of routes and parents are tested.  The outbound policy API supports many route types (Linkerd HTTPRoute, gateway HTTPRoute, GRPCRoute, TCPRoute, and TLSRoute) and each of these routes may be attached to up to two parent types (Service and EgressNetwork).  Many behaviors of the outbound policy API are shared between these route and parent types and in order to test these behaviors, many tests were duplicated for each combination of types.  This resulted in a large amount of duplication and made it difficult to determine exactly which combinations were being tested and if any combinations were missed.  It also required that the duplicated tests be kept in sync and allowed the possibility that the tests could accidentally drift apart over time resulting in inconsistent test coverage.

We introduce the TestRoute and TestParent traits which capture the common properties of routes and parents respectively and refactor the outbound policy API tests to be generic over these types and then explicitly invoke the test with the combinations of types to which the tested behavior applies.  In cases where the tested behavior is specific to a particular type rather than being common to all types, a type specific test remains.

Signed-off-by: Alex Leong <alex@buoyant.io>

policy-test/src/grpc.rs

@@ -291,22 +291,6 @@ impl OutboundPolicyClient {
         Ok(rsp.into_inner())
     }
 
-    pub async fn watch(
-        &mut self,
-        ns: &str,
-        svc: &k8s::Service,
-        port: u16,
-    ) -> Result<tonic::Streaming<outbound::OutboundPolicy>, tonic::Status> {
-        let address = svc
-            .spec
-            .as_ref()
-            .expect("Service must have a spec")
-            .cluster_ip
-            .as_ref()
-            .expect("Service must have a cluster ip");
-        self.watch_ip(ns, address, port).await
-    }
-
     pub async fn watch_ip(
         &mut self,
         ns: &str,

policy-test/src/lib.rs

@@ -6,6 +6,7 @@ pub mod bb;
 pub mod curl;
 pub mod grpc;
 pub mod outbound_api;
+pub mod test_route;
 pub mod web;
 
 use kube::runtime::wait::Condition;
@@ -15,6 +16,7 @@ use linkerd_policy_controller_k8s_api::{
     ResourceExt,
 };
 use maplit::{btreemap, convert_args};
+use test_route::TestRoute;
 use tokio::time;
 use tracing::Instrument;
 
@@ -206,24 +208,25 @@ pub async fn await_pod_ip(client: &kube::Client, ns: &str, name: &str) -> std::n
         .expect("pod IP must be valid")
 }
 
-// Waits until an HttpRoute with the given namespace and name has a status set
-// on it, then returns the generic route status representation.
-pub async fn await_route_status(
-    client: &kube::Client,
-    ns: &str,
-    name: &str,
-) -> k8s::policy::httproute::RouteStatus {
-    use k8s::policy::httproute as api;
-    let route_status = await_condition(client, ns, name, |obj: Option<&api::HttpRoute>| -> bool {
-        obj.and_then(|route| route.status.as_ref()).is_some()
-    })
-    .await
-    .expect("must fetch route")
-    .status
-    .expect("route must contain a status representation")
-    .inner;
-    tracing::trace!(?route_status, name, ns, "got route status");
-    route_status
+// Waits until an HttpRoute with the given namespace and name has been accepted.
+pub async fn await_route_accepted<R: TestRoute>(client: &kube::Client, route: &R) {
+    await_condition(
+        client,
+        &route.namespace().unwrap(),
+        &route.name_unchecked(),
+        |obj: Option<&R>| -> bool {
+            obj.map_or(false, |route| {
+                let conditions = route
+                    .conditions()
+                    .unwrap_or_default()
+                    .into_iter()
+                    .cloned()
+                    .collect::<Vec<_>>();
+                is_status_accepted(&conditions)
+            })
+        },
+    )
+    .await;
 }
 
 // Waits until an HttpRoute with the given namespace and name has a status set
@@ -591,17 +594,25 @@ pub fn mk_egress_net(ns: &str, name: &str) -> k8s::policy::EgressNetwork {
 }
 
 #[track_caller]
-pub fn assert_resource_meta(meta: &Option<grpc::meta::Metadata>, resource: &Resource, port: u16) {
+pub fn assert_resource_meta(
+    meta: &Option<grpc::meta::Metadata>,
+    parent_ref: ParentReference,
+    port: u16,
+) {
     println!("meta: {:?}", meta);
-    tracing::debug!(?meta, ?resource, port, "Asserting service metadata");
+    tracing::debug!(?meta, ?parent_ref, port, "Asserting parent metadata");
+    let mut group = parent_ref.group.unwrap();
+    if group.is_empty() {
+        group = "core".to_string();
+    }
     assert_eq!(
         meta,
         &Some(grpc::meta::Metadata {
             kind: Some(grpc::meta::metadata::Kind::Resource(grpc::meta::Resource {
-                group: resource.group(),
-                kind: resource.kind(),
-                name: resource.name(),
-                namespace: resource.namespace(),
+                group,
+                kind: parent_ref.kind.unwrap(),
+                name: parent_ref.name,
+                namespace: parent_ref.namespace.unwrap(),
                 section: "".to_string(),
                 port: port.into()
             })),