refactor: Make `server` an implementation detail (#4122)

influxdb_iox/tests/end_to_end_ng_cases/all_in_one.rs

@@ -36,14 +36,18 @@ async fn smoke() {
     // Write some data into the v2 HTTP API ==============
     let lp = format!("{},tag1=A,tag2=B val=42i 123456", table_name);
 
-    let response = write_to_router(lp, org, bucket, all_in_one.server.router_http_base()).await;
+    let response = write_to_router(lp, org, bucket, all_in_one.server().router_http_base()).await;
 
     assert_eq!(response.status(), StatusCode::NO_CONTENT);
 
     // run query in a loop until the data becomes available
     let sql = format!("select * from {}", table_name);
-    let batches =
-        query_until_results(sql, namespace, all_in_one.server.querier_grpc_connection()).await;
+    let batches = query_until_results(
+        sql,
+        namespace,
+        all_in_one.server().querier_grpc_connection(),
+    )
+    .await;
 
     let expected = [
         "+------+------+--------------------------------+-----+",

influxdb_iox/tests/end_to_end_ng_cases/ng.rs

@@ -35,7 +35,7 @@ async fn router2_through_ingester() {
     // Write some data into the v2 HTTP API ==============
     let lp = format!("{},tag1=A,tag2=B val=42i 123456", table_name);
 
-    let response = write_to_router(lp, org, bucket, router2.server.router_http_base()).await;
+    let response = write_to_router(lp, org, bucket, router2.server().router_http_base()).await;
 
     assert_eq!(response.status(), StatusCode::NO_CONTENT);
 
@@ -56,7 +56,7 @@ async fn router2_through_ingester() {
     let ingester = ServerFixture::create_single_use_with_config(test_config).await;
 
     let mut querier_flight =
-        querier::flight::Client::new(ingester.server.ingester_grpc_connection());
+        querier::flight::Client::new(ingester.server().ingester_grpc_connection());
 
     let query = IngesterQueryRequest::new(
         namespace,

test_helpers_end_to_end_ng/src/server_fixture.rs

@@ -18,7 +18,7 @@ use super::{addrs::BindAddresses, ServerType, TestConfig};
 /// Represents a server that has been started and is available for
 /// testing.
 pub struct ServerFixture {
-    pub server: Arc<TestServer>,
+    server: Arc<TestServer>,
 }
 
 impl ServerFixture {
@@ -66,6 +66,12 @@ impl ServerFixture {
     pub fn dir(&self) -> &Path {
         self.server.dir.path()
     }
+
+    /// Get a reference to the underlying server.
+    #[must_use]
+    pub fn server(&self) -> &TestServer {
+        self.server.as_ref()
+    }
 }
 
 #[derive(Debug)]