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