Port SSLClientSocket to Linux

net/base/tcp_client_socket_libevent.cc

 // Copyright (c) 2006-2008 The Chromium 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/base/tcp_client_socket.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <netdb.h>
 #include <sys/socket.h>
@@ skipping 49 matching lines @@
       return ERR_FAILED;
   }
 }
 
 //-----------------------------------------------------------------------------
 
 TCPClientSocket::TCPClientSocket(const AddressList& addresses)
   : socket_(kInvalidSocket),
     addresses_(addresses),
     current_ai_(addresses_.head()),
-    wait_state_(NOT_WAITING),
-    event_(new event) {
+    waiting_connect_(false),
+    event_(new event),
+    write_callback_(NULL),
+    callback_(NULL) {
 }
 
 TCPClientSocket::~TCPClientSocket() {
   Disconnect();
 }
 
 int TCPClientSocket::Connect(CompletionCallback* callback) {
   // If already connected, then just return OK.
   if (socket_ != kInvalidSocket)
     return OK;
 
-  DCHECK(wait_state_ == NOT_WAITING);
+  DCHECK(!waiting_connect_);
 
   const addrinfo* ai = current_ai_;
   DCHECK(ai);
 
   int rv = CreateSocket(ai);
   if (rv != OK)
     return rv;
 
   if (!connect(socket_, ai->ai_addr, static_cast<int>(ai->ai_addrlen))) {
     // Connected without waiting!
     return OK;
   }
 
   // Synchronous operation not supported
   DCHECK(callback);
 
   if (errno != EINPROGRESS) {
-    LOG(ERROR) << "connect failed: " << errno;
+    DLOG(INFO) << "connect failed: " << errno;
     return MapPosixError(errno);
   }
 
   // Initialize event_ and link it to our MessagePump.
   // POLLOUT is set if the connection is established.
   // POLLIN is set if the connection fails,
   // so select for both read and write.
   MessageLoopForIO::current()->WatchSocket(
      socket_, EV_READ|EV_WRITE|EV_PERSIST, event_.get(), this);
 
-  wait_state_ = WAITING_CONNECT;
+  waiting_connect_ = true;
   callback_ = callback;
   return ERR_IO_PENDING;
 }
 
 int TCPClientSocket::ReconnectIgnoringLastError(CompletionCallback* callback) {
   // No ignorable errors!
   return ERR_UNEXPECTED;
 }
 
 void TCPClientSocket::Disconnect() {
   if (socket_ == kInvalidSocket)
     return;
 
   MessageLoopForIO::current()->UnwatchSocket(event_.get());
   close(socket_);
   socket_ = kInvalidSocket;
+  waiting_connect_ = false;
 
   // Reset for next time.
   current_ai_ = addresses_.head();
 }
 
 bool TCPClientSocket::IsConnected() const {
-  if (socket_ == kInvalidSocket || wait_state_ == WAITING_CONNECT)
+  if (socket_ == kInvalidSocket || waiting_connect_)
     return false;
 
   // Check if connection is alive.
   char c;
   int rv = recv(socket_, &c, 1, MSG_PEEK);
   if (rv == 0)
     return false;
   if (rv == -1 && errno != EAGAIN && errno != EWOULDBLOCK)
     return false;
 
   return true;
 }
 
 int TCPClientSocket::Read(char* buf,
                           int buf_len,
                           CompletionCallback* callback) {
   DCHECK(socket_ != kInvalidSocket);
-  DCHECK(wait_state_ == NOT_WAITING);
+  DCHECK(!waiting_connect_);
   DCHECK(!callback_);
   // Synchronous operation not supported
   DCHECK(callback);
   DCHECK(buf_len > 0);
 
   int nread = read(socket_, buf, buf_len);
   if (nread >= 0) {
     return nread;
   }
-  if (errno != EAGAIN && errno != EWOULDBLOCK)
+  if (errno != EAGAIN && errno != EWOULDBLOCK) {
+    DLOG(INFO) << "read failed, errno " << errno;
     return MapPosixError(errno);
+  }
 
   MessageLoopForIO::current()->WatchSocket(
      socket_, EV_READ|EV_PERSIST, event_.get(), this);
 
   buf_ = buf;
   buf_len_ = buf_len;
-  wait_state_ = WAITING_READ;
   callback_ = callback;
   return ERR_IO_PENDING;
 }
 
 int TCPClientSocket::Write(const char* buf,
                            int buf_len,
                            CompletionCallback* callback) {
   DCHECK(socket_ != kInvalidSocket);
-  DCHECK(wait_state_ == NOT_WAITING);
-  DCHECK(!callback_);
+  DCHECK(!waiting_connect_);
+  DCHECK(!write_callback_);
   // Synchronous operation not supported
   DCHECK(callback);
   DCHECK(buf_len > 0);
 
   int nwrite = write(socket_, buf, buf_len);
   if (nwrite >= 0) {
     return nwrite;
   }
   if (errno != EAGAIN && errno != EWOULDBLOCK)
     return MapPosixError(errno);
 
   MessageLoopForIO::current()->WatchSocket(
      socket_, EV_WRITE|EV_PERSIST, event_.get(), this);
 
-  buf_ = const_cast<char*>(buf);
-  buf_len_ = buf_len;
-  wait_state_ = WAITING_WRITE;
-  callback_ = callback;
+  write_buf_ = buf;
+  write_buf_len_ = buf_len;
+  write_callback_ = callback;
   return ERR_IO_PENDING;
 }
 
 int TCPClientSocket::CreateSocket(const addrinfo* ai) {
   socket_ = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
   if (socket_ == kInvalidSocket)
     return MapPosixError(errno);
 
   // All our socket I/O is nonblocking
   if (SetNonBlocking(socket_))
     return MapPosixError(errno);
 
   return OK;
 }
 
 void TCPClientSocket::DoCallback(int rv) {
   DCHECK(rv != ERR_IO_PENDING);
   DCHECK(callback_);
 
   // since Run may result in Read being called, clear callback_ up front.
   CompletionCallback* c = callback_;
   callback_ = NULL;
   c->Run(rv);
 }
 
+void TCPClientSocket::DoWriteCallback(int rv) {
+  DCHECK(rv != ERR_IO_PENDING);
+  DCHECK(write_callback_);
+
+  // since Run may result in Write being called, clear write_callback_ up front.
+  CompletionCallback* c = write_callback_;
+  write_callback_ = NULL;
+  c->Run(rv);
+}
+
 void TCPClientSocket::DidCompleteConnect() {
   int result = ERR_UNEXPECTED;
 
-  wait_state_ = NOT_WAITING;
-
   // Check to see if connect succeeded
   int error_code = 0;
   socklen_t len = sizeof(error_code);
   if (getsockopt(socket_, SOL_SOCKET, SO_ERROR, &error_code, &len) < 0)
     error_code = errno;
 
   if (error_code == EINPROGRESS || error_code == EALREADY) {
     NOTREACHED();  // This indicates a bug in libevent or our code.
     result = ERR_IO_PENDING;
-    wait_state_ = WAITING_CONNECT;  // And await next callback.
   } else if (current_ai_->ai_next && (
              error_code == EADDRNOTAVAIL ||
              error_code == EAFNOSUPPORT ||
              error_code == ECONNREFUSED ||
              error_code == ENETUNREACH ||
              error_code == EHOSTUNREACH ||
              error_code == ETIMEDOUT)) {
     // This address failed, try next one in list.
     const addrinfo* next = current_ai_->ai_next;
     Disconnect();
     current_ai_ = next;
     result = Connect(callback_);
   } else {
     result = MapPosixError(error_code);
     MessageLoopForIO::current()->UnwatchSocket(event_.get());
+    waiting_connect_ = false;
   }
 
   if (result != ERR_IO_PENDING)
     DoCallback(result);
 }
 
-void TCPClientSocket::DidCompleteIO() {
+void TCPClientSocket::DidCompleteRead() {
   int bytes_transferred;
-  switch (wait_state_) {
-    case WAITING_READ:
-      bytes_transferred = read(socket_, buf_, buf_len_);
-      break;
-    case WAITING_WRITE:
-      bytes_transferred = write(socket_, buf_, buf_len_);
-      break;
-    default:
-      NOTREACHED();
-      return;
-  }
+  bytes_transferred = read(socket_, buf_, buf_len_);
 
   int result;
   if (bytes_transferred >= 0) {
     result = bytes_transferred;
   } else {
     result = MapPosixError(errno);
   }
 
   if (result != ERR_IO_PENDING) {
-    wait_state_ = NOT_WAITING;
+    buf_ = NULL;
+    buf_len_ = 0;
     MessageLoopForIO::current()->UnwatchSocket(event_.get());
     DoCallback(result);
   }
 }
 
+void TCPClientSocket::DidCompleteWrite() {
+  int bytes_transferred;
+  bytes_transferred = write(socket_, write_buf_, write_buf_len_);
+
+  int result;
+  if (bytes_transferred >= 0) {
+    result = bytes_transferred;
+  } else {
+    result = MapPosixError(errno);
+  }
+
+  if (result != ERR_IO_PENDING) {
+    write_buf_ = NULL;
+    write_buf_len_ = 0;
+    MessageLoopForIO::current()->UnwatchSocket(event_.get());
+    DoWriteCallback(result);
+  }
+}
+
 void TCPClientSocket::OnSocketReady(short flags) {
-  switch (wait_state_) {
-    case WAITING_CONNECT:
-      DidCompleteConnect();
-      break;
-    case WAITING_READ:
-    case WAITING_WRITE:
-      DidCompleteIO();
-      break;
-    default:
-      NOTREACHED();
-      break;
+  // the only used bits of flags are EV_READ and EV_WRITE
+
+  if (waiting_connect_) {
+    DidCompleteConnect();
+  } else {
+    if ((flags & EV_WRITE) && write_callback_)
+      DidCompleteWrite();
+    if ((flags & EV_READ) && callback_)
+      DidCompleteRead();
   }
 }
 
+int TCPClientSocket::GetPeerName(struct sockaddr *name, socklen_t *namelen) {
+  return ::getpeername(socket_, name, namelen);
+}
+
 }  // namespace net