[dart:io][windows] Implements RawSynchronousSocket

runtime/bin/sync_socket_win.cc

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #if !defined(DART_IO_DISABLED)
 
 #include "platform/globals.h"
 #if defined(HOST_OS_WINDOWS)
 
+#include "bin/socket_base.h"
 #include "bin/sync_socket.h"
 
-#include "bin/builtin.h"
-#include "bin/log.h"
-#include "bin/utils.h"
-#include "bin/utils_win.h"
-
-// #define SOCKET_LOG_ERROR 1
-
-// define SOCKET_LOG_ERROR to get log messages only for errors.
-#if defined(SOCKET_LOG_ERROR)
-#define LOG_ERR(msg, ...)                                                      \
-  {                                                                            \
-    int err = errno;                                                           \
-    Log::PrintErr("Dart Socket ERROR: %s:%d: " msg, __FILE__, __LINE__,        \
-                  ##__VA_ARGS__);                                              \
-    errno = err;                                                               \
-  }
-#else
-#define LOG_ERR(msg, ...)
-#endif  // defined(SOCKET_LOG_ERROR)
-
 namespace dart {
 namespace bin {
 
-SynchronousSocket::SynchronousSocket(intptr_t fd) {
-  LOG_ERR("SynchronousSocket is unimplemented\n");
-  UNIMPLEMENTED();
+SynchronousSocket::SynchronousSocket(intptr_t fd) : fd_(fd) {}
+
+
+void SynchronousSocket::SetClosedFd() {
+  fd_ = kClosedFd;
 }

[siva, 2017/04/21 16:40:36]

This function seems to be the same in all versions why should it not just be in
sync_socket.cc?

[zra, 2017/04/22 06:29:28]

Done.

 
 
 bool SynchronousSocket::Initialize() {
-  LOG_ERR("SynchronousSocket::Initialize is unimplemented\n");
-  UNIMPLEMENTED();
-  return false;
+  return SocketBase::Initialize();
 }
 
 
-void SynchronousSocket::SetClosedFd() {
-  LOG_ERR("SynchronousSocket::SetClosedFd is unimplemented\n");
-  UNIMPLEMENTED();
+static intptr_t Create(const RawAddr& addr) {
+  const intptr_t type = SOCK_STREAM;
+  SOCKET s = WSASocket(addr.ss.ss_family, type, 0, NULL, 0, 0);
+  return (s == INVALID_SOCKET) ? -1 : s;
+}
+
+
+static intptr_t Connect(intptr_t fd, const RawAddr& addr) {
+  SOCKET socket = static_cast<SOCKET>(fd);
+  intptr_t result =
+      connect(socket, &addr.addr, SocketAddress::GetAddrLength(addr));
+  return (result == SOCKET_ERROR) ? -1 : socket;
 }
 
 
 intptr_t SynchronousSocket::CreateConnect(const RawAddr& addr) {
-  LOG_ERR("SynchronousSocket::CreateConnect is unimplemented\n");
-  UNIMPLEMENTED();
-  return -1;
+  intptr_t fd = Create(addr);
+  return (fd < 0) ? fd : Connect(fd, addr);
+}
+
+
+intptr_t SynchronousSocket::Available(intptr_t fd) {
+  SOCKET socket = static_cast<SOCKET>(fd);
+  DWORD available;
+  intptr_t result = ioctlsocket(socket, FIONREAD, &available);
+  return (result == SOCKET_ERROR) ? -1 : static_cast<intptr_t>(available);
+}
+
+
+intptr_t SynchronousSocket::GetPort(intptr_t fd) {
+  SOCKET socket = static_cast<SOCKET>(fd);
+  RawAddr raw;
+  socklen_t size = sizeof(raw);
+  if (getsockname(socket, &raw.addr, &size) == SOCKET_ERROR) {
+    return 0;
+  }
+  return SocketAddress::GetAddrPort(raw);
+}
+
+
+SocketAddress* SynchronousSocket::GetRemotePeer(intptr_t fd, intptr_t* port) {
+  SOCKET socket = static_cast<SOCKET>(fd);
+  RawAddr raw;
+  socklen_t size = sizeof(raw);
+  if (getpeername(socket, &raw.addr, &size)) {
+    return NULL;
+  }
+  *port = SocketAddress::GetAddrPort(raw);
+  // Clear the port before calling WSAAddressToString as WSAAddressToString
+  // includes the port in the formatted string.
+  SocketAddress::SetAddrPort(&raw, 0);
+  return new SocketAddress(&raw.addr);
+}
+
+
+intptr_t SynchronousSocket::Read(intptr_t fd,
+                                 void* buffer,
+                                 intptr_t num_bytes) {
+  SOCKET socket = static_cast<SOCKET>(fd);
+  return recv(socket, reinterpret_cast<char*>(buffer), num_bytes, 0);

[siva, 2017/04/21 16:40:36]

The behavior in SocketBase::Read for EAGAIN seems to be different than what is
implemented here (returns 0 vs -1 here).

Maybe SocketBase should ASSERT that the error can never be EAGAIN as it is a
sync read.

[zra, 2017/04/22 06:29:28]

Added an extra parameter to SocketBase::Read(), etc. to indicate whether they're
called for a synchronous or asynchronous operation.

+}
+
+
+intptr_t SynchronousSocket::Write(intptr_t fd,
+                                  const void* buffer,
+                                  intptr_t num_bytes) {
+  SOCKET socket = static_cast<SOCKET>(fd);
+  return send(socket, reinterpret_cast<const char*>(buffer), num_bytes, 0);

[siva, 2017/04/21 16:40:36]

Ditto comment about behavior being different from SocketBase when EAGAIN error
happens.

[zra, 2017/04/22 06:29:28]

Done.

 }
 
 
 void SynchronousSocket::ShutdownRead(intptr_t fd) {
-  LOG_ERR("SynchronousSocket::ShutdownRead is unimplemented\n");
-  UNIMPLEMENTED();
+  SOCKET socket = static_cast<SOCKET>(fd);
+  shutdown(socket, SD_RECEIVE);
 }
 
 
 void SynchronousSocket::ShutdownWrite(intptr_t fd) {
-  LOG_ERR("SynchronousSocket::ShutdownWrite is unimplemented\n");
-  UNIMPLEMENTED();
+  SOCKET socket = static_cast<SOCKET>(fd);
+  shutdown(socket, SD_SEND);
 }
 
 
+void SynchronousSocket::Close(intptr_t fd) {
+  SOCKET socket = static_cast<SOCKET>(fd);
+  closesocket(socket);
+}

[siva, 2017/04/21 16:40:36]

I suppose datagram sync sockets are not implemented yet and that is why there is
no equivalent for SocketBase::RecvFrom here?

Are there any plans or requirements fot sync datagram sockets?

[zra, 2017/04/22 06:29:28]

Right.
I don't think we've had any request for that.

+
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(HOST_OS_WINDOWS)
 
 #endif  // !defined(DART_IO_DISABLED)