impl(rest): support LRO operation types without name method

google/cloud/internal/async_rest_long_running_operation_custom.h

@@ -71,6 +71,44 @@ future<StatusOr<ReturnType>> AsyncRestLongRunningOperation(
       });
 }
 
+template <typename ReturnType, typename OperationType,
+          typename GetOperationRequestType, typename CancelOperationRequestType,
+          typename RequestType, typename StartFunctor, typename RetryPolicyType,
+          typename CompletionQueue>
+future<StatusOr<ReturnType>> AsyncRestLongRunningOperation(
+    CompletionQueue cq, internal::ImmutableOptions options,
+    RequestType&& request, StartFunctor&& start,
+    AsyncRestPollLongRunningOperation<OperationType, GetOperationRequestType>
+        poll,
+    AsyncRestCancelLongRunningOperation<CancelOperationRequestType> cancel,
+    LongRunningOperationValueExtractor<ReturnType, OperationType>
+        value_extractor,
+    std::unique_ptr<RetryPolicyType> retry_policy,
+    std::unique_ptr<BackoffPolicy> backoff_policy, Idempotency idempotent,
+    std::unique_ptr<PollingPolicy> polling_policy, char const* location,
+    std::function<bool(OperationType const&)> is_operation_done,
+    std::function<void(std::string const&, GetOperationRequestType&)>
+        get_request_set_operation_name,
+    std::function<void(std::string const&, CancelOperationRequestType&)>
+        cancel_request_set_operation_name,
+    std::function<std::string(StatusOr<OperationType> const&)> operation_name) {
+  auto operation =
+      AsyncRestRetryLoop(std::move(retry_policy), std::move(backoff_policy),
+                         idempotent, cq, std::forward<StartFunctor>(start),
+                         options, std::forward<RequestType>(request), location);
+  auto loc = std::string{location};
+  return AsyncRestPollingLoop<OperationType, GetOperationRequestType,
+                              CancelOperationRequestType>(
+             std::move(cq), std::move(options), std::move(operation),
+             std::move(poll), std::move(cancel), std::move(polling_policy),
+             std::move(location), is_operation_done,
+             get_request_set_operation_name, cancel_request_set_operation_name,
+             operation_name)
+      .then([value_extractor, loc](future<StatusOr<OperationType>> g) {
+        return value_extractor(g.get(), loc);
+      });
+}
+
 /*
  * AsyncAwaitRestLongRunningOperation for services that do not conform to
  * AIP-151.
@@ -105,6 +143,38 @@ future<StatusOr<ReturnType>> AsyncRestAwaitLongRunningOperation(
       });
 }
 
+template <typename ReturnType, typename OperationType,
+          typename GetOperationRequestType, typename CancelOperationRequestType,
+          typename CompletionQueue>
+future<StatusOr<ReturnType>> AsyncRestAwaitLongRunningOperation(
+    CompletionQueue cq, internal::ImmutableOptions options,
+    OperationType operation,
+    AsyncRestPollLongRunningOperation<OperationType, GetOperationRequestType>
+        poll,
+    AsyncRestCancelLongRunningOperation<CancelOperationRequestType> cancel,
+    LongRunningOperationValueExtractor<ReturnType, OperationType>
+        value_extractor,
+    std::unique_ptr<PollingPolicy> polling_policy, char const* location,
+    std::function<bool(OperationType const&)> is_operation_done,
+    std::function<void(std::string const&, GetOperationRequestType&)>
+        get_request_set_operation_name,
+    std::function<void(std::string const&, CancelOperationRequestType&)>
+        cancel_request_set_operation_name,
+    std::function<std::string(StatusOr<OperationType> const&)> operation_name) {
+  auto loc = std::string{location};
+  return AsyncRestPollingLoop<OperationType, GetOperationRequestType,
+                              CancelOperationRequestType>(
+             std::move(cq), std::move(options),
+             make_ready_future(StatusOr<OperationType>(operation)),
+             std::move(poll), std::move(cancel), std::move(polling_policy),
+             std::move(location), is_operation_done,
+             get_request_set_operation_name, cancel_request_set_operation_name,
+             operation_name)
+      .then([value_extractor, loc](future<StatusOr<OperationType>> g) {
+        return value_extractor(g.get(), loc);
+      });
+}
+
 GOOGLE_CLOUD_CPP_INLINE_NAMESPACE_END
 }  // namespace rest_internal
 }  // namespace cloud

google/cloud/internal/async_rest_polling_loop_custom.h

@@ -64,6 +64,30 @@ future<StatusOr<OperationType>> AsyncRestPollingLoop(
   return loop->Start(std::move(op));
 }
 
+template <typename OperationType, typename GetOperationRequestType,
+          typename CancelOperationRequestType>
+future<StatusOr<OperationType>> AsyncRestPollingLoop(
+    google::cloud::CompletionQueue cq, internal::ImmutableOptions options,
+    future<StatusOr<OperationType>> op,
+    AsyncRestPollLongRunningOperation<OperationType, GetOperationRequestType>
+        poll,
+    AsyncRestCancelLongRunningOperation<CancelOperationRequestType> cancel,
+    std::unique_ptr<PollingPolicy> polling_policy, std::string location,
+    std::function<bool(OperationType const&)> is_operation_done,
+    std::function<void(std::string const&, GetOperationRequestType&)>
+        get_request_set_operation_name,
+    std::function<void(std::string const&, CancelOperationRequestType&)>
+        cancel_request_set_operation_name,
+    std::function<std::string(StatusOr<OperationType> const&)> operation_name) {
+  auto loop = std::make_shared<AsyncRestPollingLoopImpl<
+      OperationType, GetOperationRequestType, CancelOperationRequestType>>(
+      std::move(cq), options, std::move(poll), std::move(cancel),
+      std::move(polling_policy), std::move(location), is_operation_done,
+      get_request_set_operation_name, cancel_request_set_operation_name,
+      operation_name);
+  return loop->Start(std::move(op));
+}
+
 GOOGLE_CLOUD_CPP_INLINE_NAMESPACE_END
 }  // namespace rest_internal
 }  // namespace cloud

google/cloud/internal/async_rest_polling_loop_custom_test.cc

@@ -81,6 +81,22 @@ class BespokeOperationType {
   std::string name_;
 };
 
+class BespokeOperationTypeNoNameMethod {
+ public:
+  bool is_done() const { return is_done_; }
+  void set_is_done(bool is_done) { is_done_ = is_done; }
+  std::string const& pseudo_name_function() const { return name_; }
+  void set_name(std::string name) { name_ = std::move(name); }
+  std::string* mutable_name() { return &name_; }
+  bool operator==(BespokeOperationTypeNoNameMethod const& other) const {
+    return is_done_ == other.is_done_ && name_ == other.name_;
+  }
+
+ private:
+  bool is_done_;
+  std::string name_;
+};
+
 class BespokeGetOperationRequestType {
  public:
   std::string const& name() const { return name_; }
@@ -176,6 +192,87 @@ TEST(AsyncRestPollingLoopTest, PollThenSuccessWithBespokeOperationTypes) {
   EXPECT_THAT(*actual, Eq(expected));
 }
 
+class MockBespokeOperationNoNameMethodStub {
+ public:
+  MOCK_METHOD(future<StatusOr<BespokeOperationTypeNoNameMethod>>,
+              AsyncGetOperation,
+              (CompletionQueue&, std::unique_ptr<RestContext>, ImmutableOptions,
+               BespokeGetOperationRequestType const&),
+              ());
+
+  MOCK_METHOD(future<Status>, AsyncCancelOperation,
+              (CompletionQueue&, std::unique_ptr<RestContext>, ImmutableOptions,
+               BespokeCancelOperationRequestType const&),
+              ());
+};
+
+TEST(AsyncRestPollingLoopTest,
+     PollThenSuccessWithBespokeOperationTypeNoNameMethod) {
+  Response response;
+  response.set_seconds(123456);
+  BespokeOperationTypeNoNameMethod starting_op;
+  starting_op.set_name("test-op-name");
+  starting_op.set_is_done(false);
+  BespokeOperationTypeNoNameMethod expected = starting_op;
+  expected.set_is_done(true);
+
+  auto mock_cq = std::make_shared<MockCompletionQueueImpl>();
+  EXPECT_CALL(*mock_cq, MakeRelativeTimer)
+      .WillOnce([](std::chrono::nanoseconds) {
+        return make_ready_future(
+            make_status_or(std::chrono::system_clock::now()));
+      });
+  CompletionQueue cq(mock_cq);
+
+  auto mock = std::make_shared<MockBespokeOperationNoNameMethodStub>();
+  EXPECT_CALL(*mock, AsyncGetOperation)
+      .WillOnce([&](CompletionQueue&, std::unique_ptr<RestContext>,
+                    ImmutableOptions const& options,
+                    BespokeGetOperationRequestType const&) {
+        EXPECT_EQ(options->get<StringOption>(), CurrentTestName());
+        return make_ready_future(make_status_or(expected));
+      });
+  auto policy = std::make_unique<MockPollingPolicy>();
+  EXPECT_CALL(*policy, clone()).Times(0);
+  EXPECT_CALL(*policy, OnFailure).Times(0);
+  EXPECT_CALL(*policy, WaitPeriod)
+      .WillRepeatedly(Return(std::chrono::milliseconds(1)));
+
+  auto current = internal::MakeImmutableOptions(
+      Options{}.set<StringOption>(CurrentTestName()));
+  auto pending = AsyncRestPollingLoop<BespokeOperationTypeNoNameMethod,
+                                      BespokeGetOperationRequestType,
+                                      BespokeCancelOperationRequestType>(
+      std::move(cq), current, make_ready_future(make_status_or(starting_op)),
+      [mock](CompletionQueue& cq, std::unique_ptr<RestContext> context,
+             ImmutableOptions options,
+             BespokeGetOperationRequestType const& request) {
+        return mock->AsyncGetOperation(cq, std::move(context),
+                                       std::move(options), request);
+      },
+      [mock](CompletionQueue& cq, std::unique_ptr<RestContext> context,
+             ImmutableOptions options,
+             BespokeCancelOperationRequestType const& request) {
+        return mock->AsyncCancelOperation(cq, std::move(context),
+                                          std::move(options), request);
+      },
+      std::move(policy), "test-function",
+      [](BespokeOperationTypeNoNameMethod const& op) { return op.is_done(); },
+      [](std::string const& s, BespokeGetOperationRequestType& op) {
+        op.set_name(s);
+      },
+      [](std::string const& s, BespokeCancelOperationRequestType& op) {
+        op.set_name(s);
+      },
+      [](StatusOr<BespokeOperationTypeNoNameMethod> const& op) {
+        return op->pseudo_name_function();
+      });
+  internal::OptionsSpan overlay(Options{}.set<StringOption>("uh-oh"));
+  StatusOr<BespokeOperationTypeNoNameMethod> actual = pending.get();
+  ASSERT_THAT(actual, IsOk());
+  EXPECT_THAT(*actual, Eq(expected));
+}
+
 }  // namespace
 GOOGLE_CLOUD_CPP_INLINE_NAMESPACE_END
 }  // namespace rest_internal

google/cloud/internal/async_rest_polling_loop_impl.h

@@ -36,6 +36,11 @@ namespace cloud {
 namespace rest_internal {
 GOOGLE_CLOUD_CPP_INLINE_NAMESPACE_BEGIN
 
+template <typename OperationType>
+std::string DefaultOperationName(StatusOr<OperationType> const& operation) {
+  return operation->name();
+}
+
 template <typename OperationType, typename GetOperationRequestType,
           typename CancelOperationRequestType>
 class AsyncRestPollingLoopImpl
@@ -52,7 +57,8 @@ class AsyncRestPollingLoopImpl
       std::function<void(std::string const&, GetOperationRequestType&)>
           get_request_set_operation_name,
       std::function<void(std::string const&, CancelOperationRequestType&)>
-          cancel_request_set_operation_name)
+          cancel_request_set_operation_name,
+      std::function<std::string(StatusOr<OperationType> const&)> operation_name)
       : cq_(std::move(cq)),
         options_(std::move(options)),
         poll_(std::move(poll)),
@@ -64,7 +70,8 @@ class AsyncRestPollingLoopImpl
         get_request_set_operation_name_(
             std::move(get_request_set_operation_name)),
         cancel_request_set_operation_name_(
-            std::move(cancel_request_set_operation_name)) {}
+            std::move(cancel_request_set_operation_name)),
+        operation_name_(std::move(operation_name)) {}
 
   AsyncRestPollingLoopImpl(
       google::cloud::CompletionQueue cq, internal::ImmutableOptions options,
@@ -85,6 +92,23 @@ class AsyncRestPollingLoopImpl
               r.set_name(name);
             }) {}
 
+  AsyncRestPollingLoopImpl(
+      google::cloud::CompletionQueue cq, internal::ImmutableOptions options,
+      AsyncRestPollLongRunningOperation<OperationType, GetOperationRequestType>
+          poll,
+      AsyncRestCancelLongRunningOperation<CancelOperationRequestType> cancel,
+      std::unique_ptr<PollingPolicy> polling_policy, std::string location,
+      std::function<bool(OperationType const&)> is_operation_done,
+      std::function<void(std::string const&, GetOperationRequestType&)>
+          get_request_set_operation_name,
+      std::function<void(std::string const&, CancelOperationRequestType&)>
+          cancel_request_set_operation_name)
+      : AsyncRestPollingLoopImpl(
+            std::move(cq), std::move(options), poll, cancel,
+            std::move(polling_policy), std::move(location), is_operation_done,
+            get_request_set_operation_name, cancel_request_set_operation_name,
+            DefaultOperationName<OperationType>) {}
+
   future<StatusOr<OperationType>> Start(future<StatusOr<OperationType>> op) {
     auto self = this->shared_from_this();
     auto w = WeakFromThis();
@@ -131,15 +155,16 @@ class AsyncRestPollingLoopImpl
 
   void OnStart(StatusOr<OperationType> op) {
     if (!op) return promise_.set_value(std::move(op));
-    internal::AddSpanAttribute(*options_, "gl-cpp.LRO_name", op->name());
+    auto operation_name = operation_name_(op);
+    internal::AddSpanAttribute(*options_, "gl-cpp.LRO_name", operation_name);
     if (is_operation_done_(*op)) return promise_.set_value(std::move(op));
     GCP_LOG(DEBUG) << location_ << "() polling loop starting for "
-                   << op->name();
+                   << operation_name;
     bool do_cancel = false;
     {
       std::unique_lock<std::mutex> lk(mu_);
       std::swap(delayed_cancel_, do_cancel);
-      op_name_ = std::move(*op->mutable_name());
+      op_name_ = std::move(operation_name);
     }
     if (do_cancel) DoCancel();
     return Wait();
@@ -212,6 +237,7 @@ class AsyncRestPollingLoopImpl
       get_request_set_operation_name_;
   std::function<void(std::string const&, CancelOperationRequestType&)>
       cancel_request_set_operation_name_;
+  std::function<std::string(StatusOr<OperationType> const&)> operation_name_;
 
   // `delayed_cancel_` and `op_name_`, in contrast, are also used from
   // `DoCancel()`, which is called asynchronously, so they need locking.