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- /*
- * Copyright 2014-present Facebook, Inc.
- *
- * 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 <folly/io/async/AsyncPipe.h>
- #include <folly/Memory.h>
- #include <folly/io/async/EventBase.h>
- #include <folly/portability/GTest.h>
- #include <fcntl.h>
- using namespace testing;
- namespace {
- class TestReadCallback : public folly::AsyncReader::ReadCallback {
- public:
- bool isBufferMovable() noexcept override {
- return movable_;
- }
- void setMovable(bool movable) {
- movable_ = movable;
- }
- void readBufferAvailable(
- std::unique_ptr<folly::IOBuf> readBuf) noexcept override {
- readBuffer_.append(std::move(readBuf));
- }
- void readDataAvailable(size_t len) noexcept override {
- readBuffer_.postallocate(len);
- }
- void getReadBuffer(void** bufReturn, size_t* lenReturn) noexcept override {
- auto res = readBuffer_.preallocate(4000, 65000);
- *bufReturn = res.first;
- *lenReturn = res.second;
- }
- void readEOF() noexcept override {}
- void readErr(const folly::AsyncSocketException&) noexcept override {
- error_ = true;
- }
- std::string getData() {
- auto buf = readBuffer_.move();
- buf->coalesce();
- return std::string((char*)buf->data(), buf->length());
- }
- void reset() {
- movable_ = false;
- error_ = false;
- readBuffer_.clear();
- }
- folly::IOBufQueue readBuffer_{folly::IOBufQueue::cacheChainLength()};
- bool error_{false};
- bool movable_{false};
- };
- class TestWriteCallback : public folly::AsyncWriter::WriteCallback {
- public:
- void writeSuccess() noexcept override {
- writes_++;
- }
- void writeErr(size_t, const folly::AsyncSocketException&) noexcept override {
- error_ = true;
- }
- void reset() {
- writes_ = 0;
- error_ = false;
- }
- uint32_t writes_{0};
- bool error_{false};
- };
- class AsyncPipeTest : public Test {
- public:
- void reset(bool movable) {
- reader_.reset();
- readCallback_.reset();
- writer_.reset();
- writeCallback_.reset();
- int rc = pipe(pipeFds_);
- EXPECT_EQ(rc, 0);
- EXPECT_EQ(::fcntl(pipeFds_[0], F_SETFL, O_NONBLOCK), 0);
- EXPECT_EQ(::fcntl(pipeFds_[1], F_SETFL, O_NONBLOCK), 0);
- reader_ = folly::AsyncPipeReader::newReader(&eventBase_, pipeFds_[0]);
- writer_ = folly::AsyncPipeWriter::newWriter(&eventBase_, pipeFds_[1]);
- readCallback_.setMovable(movable);
- }
- protected:
- folly::EventBase eventBase_;
- int pipeFds_[2];
- folly::AsyncPipeReader::UniquePtr reader_;
- folly::AsyncPipeWriter::UniquePtr writer_;
- TestReadCallback readCallback_;
- TestWriteCallback writeCallback_;
- };
- std::unique_ptr<folly::IOBuf> getBuf(const std::string& data) {
- auto buf = folly::IOBuf::copyBuffer(data.c_str(), data.length());
- return buf;
- }
- } // namespace
- TEST_F(AsyncPipeTest, simple) {
- for (int pass = 0; pass < 2; ++pass) {
- reset(pass % 2 != 0);
- reader_->setReadCB(&readCallback_);
- writer_->write(getBuf("hello"), &writeCallback_);
- writer_->closeOnEmpty();
- eventBase_.loop();
- EXPECT_EQ(readCallback_.getData(), "hello");
- EXPECT_FALSE(readCallback_.error_);
- EXPECT_EQ(writeCallback_.writes_, 1);
- EXPECT_FALSE(writeCallback_.error_);
- }
- }
- TEST_F(AsyncPipeTest, blocked_writes) {
- for (int pass = 0; pass < 2; ++pass) {
- reset(pass % 2 != 0);
- uint32_t writeAttempts = 0;
- do {
- ++writeAttempts;
- writer_->write(getBuf("hello"), &writeCallback_);
- } while (writeCallback_.writes_ == writeAttempts);
- // there is one blocked write
- writer_->closeOnEmpty();
- reader_->setReadCB(&readCallback_);
- eventBase_.loop();
- std::string expected;
- for (uint32_t i = 0; i < writeAttempts; i++) {
- expected += "hello";
- }
- EXPECT_EQ(readCallback_.getData(), expected);
- EXPECT_FALSE(readCallback_.error_);
- EXPECT_EQ(writeCallback_.writes_, writeAttempts);
- EXPECT_FALSE(writeCallback_.error_);
- }
- }
- TEST_F(AsyncPipeTest, writeOnClose) {
- for (int pass = 0; pass < 2; ++pass) {
- reset(pass % 2 != 0);
- reader_->setReadCB(&readCallback_);
- writer_->write(getBuf("hello"), &writeCallback_);
- writer_->closeOnEmpty();
- writer_->write(getBuf("hello"), &writeCallback_);
- eventBase_.loop();
- EXPECT_EQ(readCallback_.getData(), "hello");
- EXPECT_FALSE(readCallback_.error_);
- EXPECT_EQ(writeCallback_.writes_, 1);
- EXPECT_TRUE(writeCallback_.error_);
- }
- }
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