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// Copyright 2021 gRPC authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "src/core/lib/promise/pipe.h"
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#include <memory>
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#include <tuple>
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#include <type_traits>
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#include <utility>
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#include "absl/status/status.h"
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#include "gmock/gmock.h"
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#include "gtest/gtest.h"
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#include <grpc/event_engine/memory_allocator.h>
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#include <grpc/support/log.h>
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#include "src/core/lib/gprpp/ref_counted_ptr.h"
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#include "src/core/lib/promise/activity.h"
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#include "src/core/lib/promise/detail/basic_join.h"
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#include "src/core/lib/promise/join.h"
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#include "src/core/lib/promise/map.h"
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#include "src/core/lib/promise/seq.h"
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#include "src/core/lib/resource_quota/memory_quota.h"
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#include "src/core/lib/resource_quota/resource_quota.h"
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#include "test/core/promise/test_wakeup_schedulers.h"
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using testing::MockFunction;
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using testing::StrictMock;
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namespace grpc_core {
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class PipeTest : public ::testing::Test {
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protected:
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MemoryAllocator memory_allocator_ = MemoryAllocator(
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ResourceQuota::Default()->memory_quota()->CreateMemoryAllocator("test"));
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};
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TEST_F(PipeTest, CanSendAndReceive) {
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StrictMock<MockFunction<void(absl::Status)>> on_done;
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EXPECT_CALL(on_done, Call(absl::OkStatus()));
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MakeActivity(
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[] {
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Pipe<int> pipe;
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return Seq(
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// Concurrently: send 42 into the pipe, and receive from the pipe.
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Join(pipe.sender.Push(42),
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Map(pipe.receiver.Next(),
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[](NextResult<int> r) { return r.value(); })),
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// Once complete, verify successful sending and the received value
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// is 42.
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[](std::tuple<bool, int> result) {
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EXPECT_TRUE(std::get<0>(result));
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EXPECT_EQ(42, std::get<1>(result));
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return absl::OkStatus();
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});
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},
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NoWakeupScheduler(),
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[&on_done](absl::Status status) { on_done.Call(std::move(status)); },
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MakeScopedArena(1024, &memory_allocator_));
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}
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TEST_F(PipeTest, CanReceiveAndSend) {
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StrictMock<MockFunction<void(absl::Status)>> on_done;
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EXPECT_CALL(on_done, Call(absl::OkStatus()));
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MakeActivity(
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[] {
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Pipe<int> pipe;
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return Seq(
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// Concurrently: receive from the pipe, and send 42 into the pipe.
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Join(Map(pipe.receiver.Next(),
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[](NextResult<int> r) { return r.value(); }),
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pipe.sender.Push(42)),
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// Once complete, verify the received value is 42 and successful
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// sending.
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[](std::tuple<int, bool> result) {
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EXPECT_EQ(std::get<0>(result), 42);
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EXPECT_TRUE(std::get<1>(result));
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return absl::OkStatus();
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});
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},
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NoWakeupScheduler(),
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[&on_done](absl::Status status) { on_done.Call(std::move(status)); },
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MakeScopedArena(1024, &memory_allocator_));
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}
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TEST_F(PipeTest, CanSeeClosedOnSend) {
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StrictMock<MockFunction<void(absl::Status)>> on_done;
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EXPECT_CALL(on_done, Call(absl::OkStatus()));
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MakeActivity(
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[] {
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Pipe<int> pipe;
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auto sender = std::move(pipe.sender);
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auto receiver = std::make_shared<std::unique_ptr<PipeReceiver<int>>>(
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std::make_unique<PipeReceiver<int>>(std::move(pipe.receiver)));
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return Seq(
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// Concurrently:
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// - push 43 into the sender, which will stall because there is no
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// reader
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// - and close the receiver, which will fail the pending send.
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Join(sender.Push(43),
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[receiver] {
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receiver->reset();
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return absl::OkStatus();
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}),
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// Verify both that the send failed and that we executed the close.
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[](const std::tuple<bool, absl::Status>& result) {
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EXPECT_EQ(result, std::make_tuple(false, absl::OkStatus()));
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return absl::OkStatus();
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});
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},
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NoWakeupScheduler(),
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[&on_done](absl::Status status) { on_done.Call(std::move(status)); },
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MakeScopedArena(1024, &memory_allocator_));
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}
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TEST_F(PipeTest, CanSeeClosedOnReceive) {
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StrictMock<MockFunction<void(absl::Status)>> on_done;
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EXPECT_CALL(on_done, Call(absl::OkStatus()));
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MakeActivity(
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[] {
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Pipe<int> pipe;
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auto sender = std::make_shared<std::unique_ptr<PipeSender<int>>>(
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std::make_unique<PipeSender<int>>(std::move(pipe.sender)));
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auto receiver = std::move(pipe.receiver);
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return Seq(
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// Concurrently:
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// - wait for a received value (will stall forever since we push
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// nothing into the queue)
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// - close the sender, which will signal the receiver to return an
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// end-of-stream.
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Join(receiver.Next(),
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[sender] {
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sender->reset();
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return absl::OkStatus();
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}),
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// Verify we received end-of-stream and closed the sender.
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[](std::tuple<NextResult<int>, absl::Status> result) {
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EXPECT_FALSE(std::get<0>(result).has_value());
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EXPECT_EQ(std::get<1>(result), absl::OkStatus());
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return absl::OkStatus();
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});
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},
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NoWakeupScheduler(),
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[&on_done](absl::Status status) { on_done.Call(std::move(status)); },
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MakeScopedArena(1024, &memory_allocator_));
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}
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TEST_F(PipeTest, CanFlowControlThroughManyStages) {
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StrictMock<MockFunction<void(absl::Status)>> on_done;
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EXPECT_CALL(on_done, Call(absl::OkStatus()));
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auto done = std::make_shared<bool>(false);
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// Push a value through multiple pipes.
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// Ensure that it's possible to do so and get flow control throughout the
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// entire pipe: ie that the push down does not complete until the last pipe
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// completes.
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MakeActivity(
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[done] {
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Pipe<int> pipe1;
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Pipe<int> pipe2;
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Pipe<int> pipe3;
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auto sender1 = std::move(pipe1.sender);
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auto receiver1 = std::move(pipe1.receiver);
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auto sender2 = std::move(pipe2.sender);
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auto receiver2 = std::move(pipe2.receiver);
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auto sender3 = std::move(pipe3.sender);
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auto receiver3 = std::move(pipe3.receiver);
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return Seq(
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Join(Seq(sender1.Push(1),
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[done] {
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*done = true;
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return 1;
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}),
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Seq(receiver1.Next(),
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[sender2 = std::move(sender2)](NextResult<int> r) mutable {
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return sender2.Push(r.value());
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}),
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Seq(receiver2.Next(),
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[sender3 = std::move(sender3)](NextResult<int> r) mutable {
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return sender3.Push(r.value());
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}),
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Seq(receiver3.Next(),
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[done](NextResult<int> r) {
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EXPECT_EQ(r.value(), 1);
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EXPECT_FALSE(*done);
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return 2;
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})),
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[](std::tuple<int, bool, bool, int> result) {
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EXPECT_EQ(result, std::make_tuple(1, true, true, 2));
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return absl::OkStatus();
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});
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},
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NoWakeupScheduler(),
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[&on_done](absl::Status status) { on_done.Call(std::move(status)); },
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MakeScopedArena(1024, &memory_allocator_));
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ASSERT_TRUE(*done);
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}
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} // namespace grpc_core
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int main(int argc, char** argv) {
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gpr_log_verbosity_init();
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::testing::InitGoogleTest(&argc, argv);
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return RUN_ALL_TESTS();
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}
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