Socket subsystem implementation

libraries/nacl-mounts/net/TcpSocket.cc

+// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "net/TcpSocket.h"
+
+#include <assert.h>
+#include <string.h>
+#include "../net/SocketSubSystem.h"
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/cpp/module.h"
+#include "../util/DebugPrint.h"
+#include "../util/PthreadHelpers.h"
+
+TCPSocket::TCPSocket(SocketSubSystem* sys, int oflag)
+  : ref_(1), oflag_(oflag), factory_(this), socket_(NULL),
+    read_buf_(kBufSize), write_sent_(false), sys_(sys) {
+}
+
+TCPSocket::~TCPSocket() {
+  assert(!socket_);
+  assert(!ref_);
+}
+
+void TCPSocket::addref() {
+  ++ref_;
+}
+
+void TCPSocket::release() {
+  if (!--ref_)
+    delete this;
+}
+
+bool TCPSocket::connect(const char* host, uint16_t port) {
+  SimpleAutoLock lock(sys_->mutex());
+  int32_t result = PP_OK_COMPLETIONPENDING;
+  pp::Module::Get()->core()->CallOnMainThread(0,
+      factory_.NewCallback(&TCPSocket::Connect, host, port, &result));
+  while (result == PP_OK_COMPLETIONPENDING) {
+    sys_->cond().wait(sys_->mutex());
+  }
+  return result == PP_OK;
+}
+
+bool TCPSocket::acceptFrom(PP_Resource resource) {
+  SimpleAutoLock lock(sys_->mutex());
+  int32_t result = PP_OK_COMPLETIONPENDING;
+  pp::Module::Get()->core()->CallOnMainThread(0,
+      factory_.NewCallback(&TCPSocket::Accept, resource, &result));
+  while (result == PP_OK_COMPLETIONPENDING) {
+    sys_->cond().wait(sys_->mutex());
+  }
+  return result == PP_OK;
+}
+
+void TCPSocket::close() {
+  SimpleAutoLock lock(sys_->mutex());
+  if (socket_) {
+    int32_t result = PP_OK_COMPLETIONPENDING;
+    pp::Module::Get()->core()->CallOnMainThread(0,
+        factory_.NewCallback(&TCPSocket::Close, &result));
+    while (result == PP_OK_COMPLETIONPENDING) {
+      sys_->cond().wait(sys_->mutex());
+    }
+  }
+}
+
+int TCPSocket::read(char* buf, size_t count, size_t* nread) {
+  SimpleAutoLock lock(sys_->mutex());
+  if (!is_open())
+    return EIO;
+
+  if (is_block()) {
+    while (in_buf_.empty() && is_open())
+      sys_->cond().wait(sys_->mutex());
+  }
+
+  *nread = 0;
+  while (*nread < count) {
+    if (in_buf_.empty())
+      break;
+
+    buf[(*nread)++] = in_buf_.front();
+    in_buf_.pop_front();
+  }
+
+  if (*nread == 0) {
+    if (!is_open()) {
+      return 0;
+    } else {
+      *nread = -1;
+      return EAGAIN;
+    }
+  }
+
+  return 0;
+}
+
+int TCPSocket::write(const char* buf, size_t count, size_t* nwrote) {
+  SimpleAutoLock lock(sys_->mutex());
+  if (!is_open())
+    return EIO;
+
+  out_buf_.insert(out_buf_.end(), buf, buf + count);
+  if (is_block()) {
+    int32_t result = PP_OK_COMPLETIONPENDING;
+    pp::Module::Get()->core()->CallOnMainThread(0,
+        factory_.NewCallback(&TCPSocket::Write, &result));
+    while (result == PP_OK_COMPLETIONPENDING)
+      sys_->cond().wait(sys_->mutex());
+    if ((size_t)result != count) {
+      *nwrote = -1;
+      return EIO;
+    } else {
+      *nwrote = count;
+      return 0;
+    }
+  } else {
+    if (!write_sent_) {
+      write_sent_ = true;
+      pp::Module::Get()->core()->CallOnMainThread(0,
+        factory_.NewCallback(&TCPSocket::Write,
+          reinterpret_cast<int32_t*>(NULL)));
+    }
+    *nwrote = count;
+    return 0;
+  }
+}
+
+int TCPSocket::fcntl(int cmd, va_list ap) {
+  if (cmd == F_GETFL) {
+    return oflag_;
+  } else if (cmd == F_SETFL) {
+    oflag_ = va_arg(ap, long);
+    return 0;
+  } else {
+    return -1;
+  }
+}
+
+bool TCPSocket::is_read_ready() {
+  return !is_open() || !in_buf_.empty();
+}
+
+bool TCPSocket::is_write_ready() {
+  return !is_open() || out_buf_.size() < kBufSize;
+}
+
+bool TCPSocket::is_exception() {
+  return !is_open();
+}
+
+void TCPSocket::Connect(int32_t result, const char* host, uint16_t port,
+                        int32_t* pres) {
+  SimpleAutoLock lock(sys_->mutex());
+  assert(!socket_);
+  socket_ = new pp::TCPSocketPrivate(sys_->instance());
+  *pres = socket_->Connect(host, port,
+      factory_.NewCallback(&TCPSocket::OnConnect, pres));
+  if (*pres != PP_OK_COMPLETIONPENDING) {
+    sys_->cond().broadcast();
+  }
+}
+
+void TCPSocket::OnConnect(int32_t result, int32_t* pres) {
+  SimpleAutoLock lock(sys_->mutex());
+  if (result == PP_OK) {
+    Read(PP_OK, NULL);
+  } else {
+    delete socket_;
+    socket_ = NULL;
+  }
+  *pres = result;
+  sys_->cond().broadcast();
+}
+
+void TCPSocket::Read(int32_t result, int32_t* pres) {
+  SimpleAutoLock lock(sys_->mutex());
+  if (!is_open())
+    return;
+
+  result = socket_->Read(&read_buf_[0], read_buf_.size(),
+      factory_.NewCallback(&TCPSocket::OnRead, pres));
+  if (result != PP_OK_COMPLETIONPENDING) {
+    delete socket_;
+    socket_ = NULL;
+    if (pres)
+      *pres = result;
+    sys_->cond().broadcast();
+  }
+}
+
+void TCPSocket::OnRead(int32_t result, int32_t* pres) {
+  SimpleAutoLock lock(sys_->mutex());
+  if (!is_open())
+    return;
+
+  if (result > 0) {
+    in_buf_.insert(in_buf_.end(), &read_buf_[0], &read_buf_[0]+result);
+    Read(PP_OK, NULL);
+  } else {
+    delete socket_;
+    socket_ = NULL;
+  }
+  if (pres)
+    *pres = result;
+  sys_->cond().broadcast();
+}
+
+void TCPSocket::Write(int32_t result, int32_t* pres) {
+  SimpleAutoLock lock(sys_->mutex());
+  if (!is_open())
+    return;
+
+  if (write_buf_.size()) {
+    // Previous write operation is in progress.
+    pp::Module::Get()->core()->CallOnMainThread(1,
+        factory_.NewCallback(&TCPSocket::Write, &result));
+    return;
+  }
+  assert(out_buf_.size());
+  write_buf_.swap(out_buf_);
+  result = socket_->Write(&write_buf_[0], write_buf_.size(),
+      factory_.NewCallback(&TCPSocket::OnWrite, pres));
+  if (result != PP_OK_COMPLETIONPENDING) {
+    dbgprintf("TCPSocket::Write: failed %d %d\n", result, write_buf_.size());
+    delete socket_;
+    socket_ = NULL;
+    if (pres)
+      *pres = result;
+    sys_->cond().broadcast();
+  }
+  write_sent_ = false;
+}
+
+void TCPSocket::OnWrite(int32_t result, int32_t* pres) {
+  SimpleAutoLock lock(sys_->mutex());
+  if (!is_open())
+    return;
+
+  if (result < 0 || (size_t)result > write_buf_.size()) {
+    // Write error.
+    dbgprintf("TCPSocket::OnWrite: close socket\n");
+    delete socket_;
+    socket_ = NULL;
+  } else if ((size_t)result < write_buf_.size()) {
+    // Partial write. Insert remaining bytes at the beginning of out_buf_.
+    out_buf_.insert(out_buf_.begin(), &write_buf_[result], &*write_buf_.end());
+  }
+  if (pres)
+    *pres = result;
+  write_buf_.clear();
+  sys_->cond().broadcast();
+}
+
+void TCPSocket::Close(int32_t result, int32_t* pres) {
+  SimpleAutoLock lock(sys_->mutex());
+  delete socket_;
+  socket_ = NULL;
+  if (pres)
+    *pres = PP_OK;
+  sys_->cond().broadcast();
+}
+
+bool TCPSocket::Accept(int32_t result, PP_Resource resource, int32_t* pres) {
+  SimpleAutoLock lock(sys_->mutex());
+  assert(!socket_);
+  socket_ = new pp::TCPSocketPrivate(pp::PassRef(), resource);
+  Read(PP_OK, NULL);
+  *pres = PP_OK;
+  sys_->cond().broadcast();
+  return true;
+}
+