Add DefaultListenSocket.

net/base/stream_listen_socket.cc

 // Copyright (c) 2012 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 "build/build_config.h"
+#include "net/base/stream_listen_socket.h"
 
 #if defined(OS_WIN)
 // winsock2.h must be included first in order to ensure it is included before
 // windows.h.
 #include <winsock2.h>
 #elif defined(OS_POSIX)
 #include <errno.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include "net/base/net_errors.h"
 #endif
 
+#include "build/build_config.h"
 #include "base/eintr_wrapper.h"
 #include "base/sys_byteorder.h"
 #include "base/threading/platform_thread.h"
 #include "net/base/net_util.h"
-#include "net/base/tcp_listen_socket.h"
+
+using std::string;
 
 #if defined(OS_WIN)
 typedef int socklen_t;
 #endif  // defined(OS_WIN)
 
 namespace net {
 
 namespace {
 
 const int kReadBufSize = 4096;
 
 }  // namespace
 
 #if defined(OS_WIN)
-const SOCKET TCPListenSocket::kInvalidSocket = INVALID_SOCKET;
-const int TCPListenSocket::kSocketError = SOCKET_ERROR;
+const SOCKET StreamListenSocket::kInvalidSocket = INVALID_SOCKET;
+const int StreamListenSocket::kSocketError = SOCKET_ERROR;
 #elif defined(OS_POSIX)
-const SOCKET TCPListenSocket::kInvalidSocket = -1;
-const int TCPListenSocket::kSocketError = -1;
+const SOCKET StreamListenSocket::kInvalidSocket = -1;
+const int StreamListenSocket::kSocketError = -1;
 #endif
 
-TCPListenSocket* TCPListenSocket::CreateAndListen(
-    const std::string& ip, int port, ListenSocket::ListenSocketDelegate *del) {
-  SOCKET s = CreateAndBind(ip, port);
-  if (s == kInvalidSocket) {
-    // TODO(erikkay): error handling
-  } else {
-    TCPListenSocket* sock = new TCPListenSocket(s, del);
-    sock->Listen();
-    return sock;
-  }
-  return NULL;
-}
-
-void TCPListenSocket::PauseReads() {
-  DCHECK(!reads_paused_);
-  reads_paused_ = true;
-}
-
-void TCPListenSocket::ResumeReads() {
-  DCHECK(reads_paused_);
-  reads_paused_ = false;
-  if (has_pending_reads_) {
-    has_pending_reads_ = false;
-    Read();
-  }
-}
-
-TCPListenSocket::TCPListenSocket(SOCKET s,
-                                 ListenSocket::ListenSocketDelegate *del)
-    : ListenSocket(del),
+StreamListenSocket::StreamListenSocket(SOCKET s,
+                                       StreamListenSocket::Delegate* del)
+    : socket_delegate_(del),
       socket_(s),
       reads_paused_(false),
       has_pending_reads_(false) {
 #if defined(OS_WIN)
   socket_event_ = WSACreateEvent();
-  // TODO(ibrar): error handling in case of socket_event_ == WSA_INVALID_EVENT
+  // TODO(ibrar): error handling in case of socket_event_ == WSA_INVALID_EVENT.
   WatchSocket(NOT_WAITING);
 #elif defined(OS_POSIX)
   wait_state_ = NOT_WAITING;
 #endif
 }
 
-TCPListenSocket::~TCPListenSocket() {
+StreamListenSocket::~StreamListenSocket() {
 #if defined(OS_WIN)
   if (socket_event_) {
     WSACloseEvent(socket_event_);
     socket_event_ = WSA_INVALID_EVENT;
   }
 #endif
   CloseSocket(socket_);
 }
 
-SOCKET TCPListenSocket::CreateAndBind(const std::string& ip, int port) {
-  SOCKET s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
-  if (s != kInvalidSocket) {
-#if defined(OS_POSIX)
-    // Allow rapid reuse.
-    static const int kOn = 1;
-    setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &kOn, sizeof(kOn));
-#endif
-    sockaddr_in addr;
-    memset(&addr, 0, sizeof(addr));
-    addr.sin_family = AF_INET;
-    addr.sin_addr.s_addr = inet_addr(ip.c_str());
-    addr.sin_port = base::HostToNet16(port);
-    if (bind(s, reinterpret_cast<sockaddr*>(&addr), sizeof(addr))) {
-#if defined(OS_WIN)
-      closesocket(s);
-#elif defined(OS_POSIX)
-      close(s);
-#endif
-      s = kInvalidSocket;
-    }
-  }
-  return s;
+void StreamListenSocket::Send(const char* bytes, int len,
+                              bool append_linefeed) {
+  SendInternal(bytes, len);
+  if (append_linefeed)
+    SendInternal("\r\n", 2);
 }
 
-SOCKET TCPListenSocket::Accept(SOCKET s) {
-  sockaddr_in from;
-  socklen_t from_len = sizeof(from);
-  SOCKET conn =
-      HANDLE_EINTR(accept(s, reinterpret_cast<sockaddr*>(&from), &from_len));
-  if (conn != kInvalidSocket) {
+void StreamListenSocket::Send(const string& str, bool append_linefeed) {
+  Send(str.data(), static_cast<int>(str.length()), append_linefeed);
+}
+
+SOCKET StreamListenSocket::AcceptSocket() {
+  SOCKET conn = HANDLE_EINTR(accept(socket_, NULL, NULL));
+  if (conn == kInvalidSocket)
+    LOG(ERROR) << "Error accepting connection.";
+  else
     SetNonBlocking(conn);
-  }
   return conn;
 }
 
-void TCPListenSocket::SendInternal(const char* bytes, int len) {
-  char* send_buf = const_cast<char *>(bytes);
+void StreamListenSocket::SendInternal(const char* bytes, int len) {
+  char* send_buf = const_cast<char*>(bytes);
   int len_left = len;
   while (true) {
     int sent = HANDLE_EINTR(send(socket_, send_buf, len_left, 0));
     if (sent == len_left) {  // A shortcut to avoid extraneous checks.
       break;
     }
     if (sent == kSocketError) {
 #if defined(OS_WIN)
       if (WSAGetLastError() != WSAEWOULDBLOCK) {
         LOG(ERROR) << "send failed: WSAGetLastError()==" << WSAGetLastError();
 #elif defined(OS_POSIX)
       if (errno != EWOULDBLOCK && errno != EAGAIN) {
         LOG(ERROR) << "send failed: errno==" << errno;
 #endif
         break;
       }
       // Otherwise we would block, and now we have to wait for a retry.
-      // Fall through to PlatformThread::YieldCurrentThread()
+      // Fall through to PlatformThread::YieldCurrentThread().
+    } else if (sent == 0) {
+      // Socket was disconnected.
+      Close();
     } else {
       // sent != len_left according to the shortcut above.
       // Shift the buffer start and send the remainder after a short while.
       send_buf += sent;
       len_left -= sent;
     }
     base::PlatformThread::YieldCurrentThread();
   }
 }
 
-void TCPListenSocket::Listen() {
+void StreamListenSocket::Listen() {
   int backlog = 10;  // TODO(erikkay): maybe don't allow any backlog?
-  listen(socket_, backlog);
-  // TODO(erikkay): error handling
+  if (listen(socket_, backlog) == -1) {

[mmenke, 2012/04/30 19:11:44]

nit:  Suggest you keep the error handling TODO here, since we aren't informing
anyone of the error.

[Philippe, 2012/05/03 14:27:52]

Done.

+    LOG(ERROR) << "Could not listen on socket.";
+    return;
+  }
 #if defined(OS_POSIX)
   WatchSocket(WAITING_ACCEPT);
 #endif
 }
 
-void TCPListenSocket::Accept() {
-  SOCKET conn = Accept(socket_);
-  if (conn != kInvalidSocket) {
-    scoped_refptr<TCPListenSocket> sock(
-        new TCPListenSocket(conn, socket_delegate_));
-    // it's up to the delegate to AddRef if it wants to keep it around
-#if defined(OS_POSIX)
-    sock->WatchSocket(WAITING_READ);
-#endif
-    socket_delegate_->DidAccept(this, sock);
-  } else {
-    // TODO(ibrar): some error handling required here
-  }
-}
-
-void TCPListenSocket::Read() {
-  char buf[kReadBufSize + 1];  // +1 for null termination
+void StreamListenSocket::Read() {
+  char buf[kReadBufSize + 1];  // +1 for null termination.
   int len;
   do {
     len = HANDLE_EINTR(recv(socket_, buf, kReadBufSize, 0));
     if (len == kSocketError) {
 #if defined(OS_WIN)
       int err = WSAGetLastError();
       if (err == WSAEWOULDBLOCK) {
 #elif defined(OS_POSIX)
       if (errno == EWOULDBLOCK || errno == EAGAIN) {
 #endif
         break;
       } else {
-        // TODO(ibrar): some error handling required here
+        // TODO(ibrar): some error handling required here.
         break;
       }
     } else if (len == 0) {
-      // In Windows, Close() is called by OnObjectSignaled.  In POSIX, we need
+      // In Windows, Close() is called by OnObjectSignaled. In POSIX, we need
       // to call it here.
 #if defined(OS_POSIX)
       Close();
 #endif
     } else {
-      // TODO(ibrar): maybe change DidRead to take a length instead
+      // TODO(ibrar): maybe change DidRead to take a length instead.
       DCHECK_GT(len, 0);
       DCHECK_LE(len, kReadBufSize);
-      buf[len] = 0;  // already create a buffer with +1 length
+      buf[len] = 0;  // Already create a buffer with +1 length.
       socket_delegate_->DidRead(this, buf, len);
     }
   } while (len == kReadBufSize);
 }
 
-void TCPListenSocket::Close() {
+void StreamListenSocket::Close() {
 #if defined(OS_POSIX)
   if (wait_state_ == NOT_WAITING)
     return;
   wait_state_ = NOT_WAITING;
 #endif
   UnwatchSocket();
   socket_delegate_->DidClose(this);
 }
 
-void TCPListenSocket::CloseSocket(SOCKET s) {
+void StreamListenSocket::CloseSocket(SOCKET s) {
   if (s && s != kInvalidSocket) {
     UnwatchSocket();
 #if defined(OS_WIN)
     closesocket(s);
 #elif defined(OS_POSIX)
     close(s);
 #endif
   }
 }
 
-void TCPListenSocket::WatchSocket(WaitState state) {
+void StreamListenSocket::WatchSocket(WaitState state) {
 #if defined(OS_WIN)
   WSAEventSelect(socket_, socket_event_, FD_ACCEPT | FD_CLOSE | FD_READ);
   watcher_.StartWatching(socket_event_, this);
 #elif defined(OS_POSIX)
   // Implicitly calls StartWatchingFileDescriptor().
   MessageLoopForIO::current()->WatchFileDescriptor(
       socket_, true, MessageLoopForIO::WATCH_READ, &watcher_, this);
   wait_state_ = state;
 #endif
 }
 
-void TCPListenSocket::UnwatchSocket() {
+void StreamListenSocket::UnwatchSocket() {
 #if defined(OS_WIN)
   watcher_.StopWatching();
 #elif defined(OS_POSIX)
   watcher_.StopWatchingFileDescriptor();
 #endif
 }
 
-// TODO(ibrar): We can add these functions into OS dependent files
+// TODO(ibrar): We can add these functions into OS dependent files.
 #if defined(OS_WIN)
-// MessageLoop watcher callback
-void TCPListenSocket::OnObjectSignaled(HANDLE object) {
+// MessageLoop watcher callback.
+void StreamListenSocket::OnObjectSignaled(HANDLE object) {
   WSANETWORKEVENTS ev;
   if (kSocketError == WSAEnumNetworkEvents(socket_, socket_event_, &ev)) {
     // TODO
     return;
   }
 
-  // The object was reset by WSAEnumNetworkEvents.  Watch for the next signal.
+  // The object was reset by WSAEnumNetworkEvents. Watch for the next signal.
   watcher_.StartWatching(object, this);
 
   if (ev.lNetworkEvents == 0) {
     // Occasionally the event is set even though there is no new data.
     // The net seems to think that this is ignorable.
     return;
   }
   if (ev.lNetworkEvents & FD_ACCEPT) {
     Accept();
   }
   if (ev.lNetworkEvents & FD_READ) {
     if (reads_paused_) {
       has_pending_reads_ = true;
     } else {
       Read();
     }
   }
   if (ev.lNetworkEvents & FD_CLOSE) {
     Close();
   }
 }
 #elif defined(OS_POSIX)
-void TCPListenSocket::OnFileCanReadWithoutBlocking(int fd) {
+void StreamListenSocket::OnFileCanReadWithoutBlocking(int fd) {
   switch (wait_state_) {
     case WAITING_ACCEPT:
       Accept();
       break;
     case WAITING_READ:
       if (reads_paused_) {
         has_pending_reads_ = true;
       } else {
         Read();
       }
       break;
     default:
       // Close() is called by Read() in the Linux case.
       NOTREACHED();
       break;
   }
 }
 
-void TCPListenSocket::OnFileCanWriteWithoutBlocking(int fd) {
+void StreamListenSocket::OnFileCanWriteWithoutBlocking(int fd) {
   // MessagePumpLibevent callback, we don't listen for write events
   // so we shouldn't ever reach here.
   NOTREACHED();
 }
 
 #endif
 
+void StreamListenSocket::PauseReads() {
+  DCHECK(!reads_paused_);
+  reads_paused_ = true;
+}
+
+void StreamListenSocket::ResumeReads() {
+  DCHECK(reads_paused_);
+  reads_paused_ = false;
+  if (has_pending_reads_) {
+    has_pending_reads_ = false;
+    Read();
+  }
+}
+
 }  // namespace net