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/**
* Copyright (C) 2021-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/transport/asio_utils.h"
#include <asio.hpp>
#include "mongo/unittest/assert_that.h"
#include "mongo/unittest/unittest.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/time_support.h"
namespace mongo::transport {
namespace {
using namespace unittest::match;
template <typename Stream>
void writeToSocketAndPollForResponse(Stream& writeSocket, Stream& readSocket, StringData data) {
// Write our payload to our socket.
asio::write(writeSocket, asio::const_buffer(data.rawData(), data.size()));
// Poll the other end of the connection for data before returning. Wait up to a second for data
// to appear.
const auto start = Date_t::now();
while (!readSocket.available()) {
if (Date_t::now() - start >= Seconds(1)) {
FAIL("Data was not successfully transmitted across socket pair in time");
}
}
}
template <typename Stream>
void peekAllSubstrings(Stream& writeSocket, Stream& readSocket, StringData data) {
writeToSocketAndPollForResponse(writeSocket, readSocket, data);
// Peek from the socket for all substrings up to and including the full payload size.
// We should never block here.
for (size_t bufferSize = 0; bufferSize <= data.size(); ++bufferSize) {
auto inBuffer = std::make_unique<char[]>(bufferSize);
const auto bytesRead =
peekASIOStream(readSocket, asio::mutable_buffer(inBuffer.get(), bufferSize));
ASSERT_THAT(StringData(inBuffer.get(), bytesRead), Eq(data.substr(0, bufferSize)));
}
}
template <typename Stream>
void peekPastBuffer(Stream& writeSocket, Stream& readSocket, StringData data) {
writeToSocketAndPollForResponse(writeSocket, readSocket, data);
// Peek from the socket more than is available. We should just get what is available.
const auto bufferSize = data.size() + 1;
for (size_t attemptCount = 0; attemptCount < 3; ++attemptCount) {
auto inBuffer = std::make_unique<char[]>(bufferSize);
const auto bytesRead =
peekASIOStream(readSocket, asio::mutable_buffer(inBuffer.get(), bufferSize));
ASSERT_THAT(StringData(inBuffer.get(), bytesRead), Eq(data));
}
}
#ifdef ASIO_HAS_LOCAL_SOCKETS
auto prepareUnixSocketPair(asio::io_context& io_context) {
asio::local::stream_protocol::socket writeSocket(io_context);
asio::local::stream_protocol::socket readSocket(io_context);
asio::local::connect_pair(writeSocket, readSocket);
readSocket.non_blocking(true);
return std::pair(std::move(writeSocket), std::move(readSocket));
}
TEST(ASIOUtils, PeekAvailableBytes) {
asio::io_context io_context;
auto [writeSocket, readSocket] = prepareUnixSocketPair(io_context);
peekAllSubstrings(writeSocket, readSocket, "example"_sd);
}
TEST(ASIOUtils, PeekPastAvailableBytes) {
asio::io_context io_context;
auto [writeSocket, readSocket] = prepareUnixSocketPair(io_context);
peekPastBuffer(writeSocket, readSocket, "example"_sd);
}
#endif // ASIO_HAS_LOCAL_SOCKETS
auto prepareTCPSocketPair(asio::io_context& io_context) {
// Make a local loopback connection on an arbitrary ephemeral port.
asio::ip::tcp::endpoint ep(asio::ip::make_address("127.0.0.1"), 0);
asio::ip::tcp::acceptor acceptor(io_context, ep.protocol());
{
std::error_code ec;
acceptor.bind(ep, ec);
uassertStatusOK(errorCodeToStatus(ec, "prepareTCPSocketPair bind"));
}
acceptor.listen();
asio::ip::tcp::socket readSocket(io_context, ep.protocol());
readSocket.connect(acceptor.local_endpoint());
asio::ip::tcp::socket writeSocket(io_context);
acceptor.accept(writeSocket);
writeSocket.non_blocking(false);
// Set no_delay so that our output doesn't get buffered in a kernel buffer.
writeSocket.set_option(asio::ip::tcp::no_delay(true));
readSocket.non_blocking(true);
return std::pair(std::move(writeSocket), std::move(readSocket));
}
TEST(ASIOUtils, PeekAvailableBytesTCP) {
asio::io_context io_context;
auto [writeSocket, readSocket] = prepareTCPSocketPair(io_context);
peekAllSubstrings(writeSocket, readSocket, "example"_sd);
}
TEST(ASIOUtils, PeekPastAvailableBytesTCP) {
asio::io_context io_context;
auto [writeSocket, readSocket] = prepareTCPSocketPair(io_context);
peekPastBuffer(writeSocket, readSocket, "example"_sd);
}
} // namespace
} // namespace mongo::transport
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