barrier/net/CTCPSocket.cpp

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C++
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2001-10-06 14:13:28 +00:00
#include "CTCPSocket.h"
#include "CBufferedInputStream.h"
#include "CBufferedOutputStream.h"
#include "CNetworkAddress.h"
#include "CLock.h"
#include "CMutex.h"
#include "CCondVar.h"
#include "CThread.h"
#include "TMethodJob.h"
#include "CStopwatch.h"
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/poll.h>
#include <netinet/in.h>
#include <assert.h>
//
// CTCPSocket
//
CTCPSocket::CTCPSocket() throw(XSocket)
{
m_fd = socket(PF_INET, SOCK_STREAM, 0);
if (m_fd == -1) {
throw XSocketCreate();
}
init();
}
CTCPSocket::CTCPSocket(int fd) throw() :
m_fd(fd)
{
assert(m_fd != -1);
init();
// socket starts in connected state
m_connected = kReadWrite;
// start handling socket
m_thread = new CThread(new TMethodJob<CTCPSocket>(
this, &CTCPSocket::service));
}
CTCPSocket::~CTCPSocket()
{
try {
close();
}
catch (...) {
// ignore failures
}
// clean up
delete m_mutex;
delete m_input;
delete m_output;
}
void CTCPSocket::bind(const CNetworkAddress& addr)
throw(XSocket)
{
if (::bind(m_fd, addr.getAddress(), addr.getAddressLength()) == -1) {
if (errno == EADDRINUSE) {
throw XSocketAddressInUse();
}
throw XSocketBind();
}
}
void CTCPSocket::connect(const CNetworkAddress& addr)
throw(XSocket)
{
CThread::testCancel();
if (::connect(m_fd, addr.getAddress(), addr.getAddressLength()) == -1) {
CThread::testCancel();
throw XSocketConnect();
}
// start servicing the socket
m_connected = kReadWrite;
m_thread = new CThread(new TMethodJob<CTCPSocket>(
this, &CTCPSocket::service));
}
void CTCPSocket::close() throw(XIO)
{
// shutdown I/O thread before close
if (m_thread != NULL) {
// flush if output buffer not empty and output buffer not closed
bool doFlush;
{
CLock lock(m_mutex);
doFlush = ((m_connected & kWrite) != 0);
}
if (doFlush) {
m_output->flush();
}
m_thread->cancel();
m_thread->wait();
delete m_thread;
m_thread = NULL;
}
CLock lock(m_mutex);
if (m_fd != -1) {
if (::close(m_fd) == -1) {
throw XIOClose();
}
m_fd = -1;
}
}
IInputStream* CTCPSocket::getInputStream() throw()
{
return m_input;
}
IOutputStream* CTCPSocket::getOutputStream() throw()
{
return m_output;
}
void CTCPSocket::init() throw(XIO)
{
m_mutex = new CMutex;
m_thread = NULL;
m_connected = kClosed;
m_input = new CBufferedInputStream(m_mutex,
new TMethodJob<CTCPSocket>(
this, &CTCPSocket::closeInput));
m_output = new CBufferedOutputStream(m_mutex,
new TMethodJob<CTCPSocket>(
this, &CTCPSocket::closeOutput));
}
void CTCPSocket::service(void*) throw(XThread)
{
assert(m_fd != -1);
// now service the connection
struct pollfd pfds[1];
pfds[0].fd = m_fd;
for (;;) {
{
// choose events to poll for
CLock lock(m_mutex);
pfds[0].events = 0;
if ((m_connected & kRead) != 0) {
// still open for reading
pfds[0].events |= POLLIN;
}
if ((m_connected & kWrite) != 0 && m_output->getSize() > 0) {
// data queued for writing
pfds[0].events |= POLLOUT;
}
}
// check for status
CThread::testCancel();
const int status = poll(pfds, 1, 50);
CThread::testCancel();
// transfer data and handle errors
if (status == 1) {
if ((pfds[0].revents & (POLLERR | POLLNVAL)) != 0) {
// stream is no good anymore so bail
m_input->hangup();
return;
}
// read some data
if (pfds[0].revents & POLLIN) {
UInt8 buffer[4096];
ssize_t n = read(m_fd, buffer, sizeof(buffer));
if (n > 0) {
CLock lock(m_mutex);
m_input->write(buffer, n);
}
else if (n == 0) {
// stream hungup
m_input->hangup();
return;
}
}
// write some data
if (pfds[0].revents & POLLOUT) {
CLock lock(m_mutex);
// get amount of data to write
UInt32 n = m_output->getSize();
if (n > 4096) {
// limit write size
n = 4096;
}
// write data
const void* buffer = m_output->peek(n);
n = write(m_fd, buffer, n);
// discard written data
if (n > 0) {
m_output->pop(n);
}
}
}
}
}
void CTCPSocket::closeInput(void*) throw()
{
// note -- m_mutex should already be locked
shutdown(m_fd, 0);
m_connected &= ~kRead;
}
void CTCPSocket::closeOutput(void*) throw()
{
// note -- m_mutex should already be locked
shutdown(m_fd, 1);
m_connected &= ~kWrite;
}