393 lines
10 KiB
C++
393 lines
10 KiB
C++
/*
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* IXSocket.cpp
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* Author: Benjamin Sergeant
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* Copyright (c) 2017-2018 Machine Zone, Inc. All rights reserved.
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*/
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#include "IXSocket.h"
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#include "IXSocketConnect.h"
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#include "IXNetSystem.h"
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#include "IXSelectInterrupt.h"
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#include "IXSelectInterruptFactory.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <stdint.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <poll.h>
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#include <algorithm>
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#ifdef min
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#undef min
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#endif
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namespace ix
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{
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const int Socket::kDefaultPollNoTimeout = -1; // No poll timeout by default
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const int Socket::kDefaultPollTimeout = kDefaultPollNoTimeout;
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const uint64_t Socket::kSendRequest = 1;
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const uint64_t Socket::kCloseRequest = 2;
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constexpr size_t Socket::kChunkSize;
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Socket::Socket(int fd) :
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_sockfd(fd),
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_selectInterrupt(createSelectInterrupt())
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{
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;
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}
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Socket::~Socket()
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{
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close();
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}
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PollResultType Socket::poll(bool readyToRead,
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int timeoutMs,
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int sockfd,
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std::shared_ptr<SelectInterrupt> selectInterrupt)
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{
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//
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// We used to use ::select to poll but on Android 9 we get large fds out of ::connect
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// which crash in FD_SET as they are larger than FD_SETSIZE.
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// Switching to ::poll does fix that.
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//
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// However poll isn't as portable as select and has bugs on Windows, so we should write a
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// shim to fallback to select on those platforms.
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// See https://github.com/mpv-player/mpv/pull/5203/files for such a select wrapper.
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//
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int nfds = 1;
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struct pollfd fds[2];
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fds[0].fd = sockfd;
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fds[0].events = (readyToRead) ? POLLIN : POLLOUT;
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fds[0].events |= POLLERR;
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// File descriptor used to interrupt select when needed
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int interruptFd = -1;
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if (selectInterrupt)
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{
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interruptFd = selectInterrupt->getFd();
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if (interruptFd != -1)
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{
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nfds = 2;
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fds[1].fd = interruptFd;
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fds[1].events = POLLIN;
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}
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}
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int ret = ::poll(fds, nfds, timeoutMs);
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PollResultType pollResult = PollResultType::ReadyForRead;
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if (ret < 0)
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{
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pollResult = PollResultType::Error;
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}
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else if (ret == 0)
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{
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pollResult = PollResultType::Timeout;
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}
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else if (interruptFd != -1 && fds[1].revents & POLLIN)
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{
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uint64_t value = selectInterrupt->read();
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if (value == kSendRequest)
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{
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pollResult = PollResultType::SendRequest;
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}
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else if (value == kCloseRequest)
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{
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pollResult = PollResultType::CloseRequest;
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}
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}
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else if (sockfd != -1 && readyToRead && fds[0].revents & POLLIN)
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{
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pollResult = PollResultType::ReadyForRead;
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}
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else if (sockfd != -1 && !readyToRead && fds[0].revents & POLLOUT)
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{
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pollResult = PollResultType::ReadyForWrite;
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#ifdef _WIN32
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// On connect error, in async mode, windows will write to the exceptions fds
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if (fds[0].revents & POLLERR)
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{
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pollResult = PollResultType::Error;
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}
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#else
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int optval = -1;
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socklen_t optlen = sizeof(optval);
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// getsockopt() puts the errno value for connect into optval so 0
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// means no-error.
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if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &optval, &optlen) == -1 ||
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optval != 0)
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{
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pollResult = PollResultType::Error;
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}
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#endif
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}
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return pollResult;
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}
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PollResultType Socket::isReadyToRead(int timeoutMs)
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{
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if (_sockfd == -1)
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{
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return PollResultType::Error;
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}
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bool readyToRead = true;
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return poll(readyToRead, timeoutMs, _sockfd, _selectInterrupt);
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}
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PollResultType Socket::isReadyToWrite(int timeoutMs)
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{
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if (_sockfd == -1)
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{
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return PollResultType::Error;
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}
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bool readyToRead = false;
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return poll(readyToRead, timeoutMs, _sockfd, _selectInterrupt);
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}
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// Wake up from poll/select by writing to the pipe which is watched by select
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bool Socket::wakeUpFromPoll(uint64_t wakeUpCode)
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{
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return _selectInterrupt->notify(wakeUpCode);
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}
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bool Socket::connect(const std::string& host,
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int port,
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std::string& errMsg,
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const CancellationRequest& isCancellationRequested)
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{
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std::lock_guard<std::mutex> lock(_socketMutex);
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if (!_selectInterrupt->clear()) return false;
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_sockfd = SocketConnect::connect(host, port, errMsg, isCancellationRequested);
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return _sockfd != -1;
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}
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void Socket::close()
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{
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std::lock_guard<std::mutex> lock(_socketMutex);
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if (_sockfd == -1) return;
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closeSocket(_sockfd);
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_sockfd = -1;
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}
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ssize_t Socket::send(char* buffer, size_t length)
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{
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int flags = 0;
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#ifdef MSG_NOSIGNAL
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flags = MSG_NOSIGNAL;
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#endif
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return ::send(_sockfd, buffer, length, flags);
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}
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ssize_t Socket::send(const std::string& buffer)
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{
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return send((char*)&buffer[0], buffer.size());
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}
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ssize_t Socket::recv(void* buffer, size_t length)
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{
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int flags = 0;
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#ifdef MSG_NOSIGNAL
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flags = MSG_NOSIGNAL;
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#endif
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return ::recv(_sockfd, (char*) buffer, length, flags);
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}
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int Socket::getErrno()
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{
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int err;
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#ifdef _WIN32
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err = WSAGetLastError();
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#else
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err = errno;
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#endif
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return err;
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}
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bool Socket::isWaitNeeded()
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{
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int err = getErrno();
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if (err == EWOULDBLOCK || err == EAGAIN || err == EINPROGRESS)
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{
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return true;
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}
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return false;
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}
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void Socket::closeSocket(int fd)
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{
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#ifdef _WIN32
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closesocket(fd);
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#else
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::close(fd);
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#endif
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}
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bool Socket::init(std::string& errorMsg)
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{
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return _selectInterrupt->init(errorMsg);
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}
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bool Socket::writeBytes(const std::string& str,
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const CancellationRequest& isCancellationRequested)
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{
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char* buffer = const_cast<char*>(str.c_str());
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int len = (int) str.size();
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while (true)
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{
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if (isCancellationRequested && isCancellationRequested()) return false;
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ssize_t ret = send(buffer, len);
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// We wrote some bytes, as needed, all good.
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if (ret > 0)
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{
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if (ret == len)
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{
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return true;
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}
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else
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{
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buffer += ret;
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len -= ret;
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continue;
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}
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}
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// There is possibly something to be writen, try again
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else if (ret < 0 && Socket::isWaitNeeded())
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{
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continue;
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}
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// There was an error during the write, abort
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else
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{
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return false;
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}
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}
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}
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bool Socket::readByte(void* buffer,
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const CancellationRequest& isCancellationRequested)
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{
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while (true)
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{
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if (isCancellationRequested && isCancellationRequested()) return false;
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ssize_t ret;
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ret = recv(buffer, 1);
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// We read one byte, as needed, all good.
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if (ret == 1)
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{
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return true;
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}
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// There is possibly something to be read, try again
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else if (ret < 0 && Socket::isWaitNeeded())
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{
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// Wait with a 1ms timeout until the socket is ready to read.
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// This way we are not busy looping
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if (isReadyToRead(1) == PollResultType::Error)
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{
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return false;
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}
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}
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// There was an error during the read, abort
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else
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{
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return false;
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}
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}
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}
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std::pair<bool, std::string> Socket::readLine(
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const CancellationRequest& isCancellationRequested)
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{
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char c;
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std::string line;
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line.reserve(64);
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for (int i = 0; i < 2 || (line[i-2] != '\r' && line[i-1] != '\n'); ++i)
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{
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if (!readByte(&c, isCancellationRequested))
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{
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// Return what we were able to read
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return std::make_pair(false, line);
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}
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line += c;
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}
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return std::make_pair(true, line);
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}
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std::pair<bool, std::string> Socket::readBytes(
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size_t length,
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const OnProgressCallback& onProgressCallback,
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const CancellationRequest& isCancellationRequested)
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{
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if (_readBuffer.empty())
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{
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_readBuffer.resize(kChunkSize);
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}
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std::vector<uint8_t> output;
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while (output.size() != length)
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{
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if (isCancellationRequested && isCancellationRequested())
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{
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return std::make_pair(false, std::string());
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}
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size_t size = std::min(kChunkSize, length - output.size());
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ssize_t ret = recv((char*)&_readBuffer[0], size);
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if (ret <= 0 && !Socket::isWaitNeeded())
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{
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// Error
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return std::make_pair(false, std::string());
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}
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else
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{
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output.insert(output.end(),
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_readBuffer.begin(),
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_readBuffer.begin() + ret);
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}
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if (onProgressCallback) onProgressCallback((int) output.size(), (int) length);
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// Wait with a 1ms timeout until the socket is ready to read.
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// This way we are not busy looping
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if (isReadyToRead(1) == PollResultType::Error)
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{
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return std::make_pair(false, std::string());
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}
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}
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return std::make_pair(true, std::string(output.begin(),
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output.end()));
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}
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}
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