Revert "Move mojo edk into mojo/edk"

mojo/edk/system/channel.cc

Index: mojo/edk/system/channel.cc
diff --git a/mojo/edk/system/channel.cc b/mojo/edk/system/channel.cc
deleted file mode 100644
index 79b6e92c638e44376c1126c38e456c3d7af8a0df..0000000000000000000000000000000000000000
--- a/mojo/edk/system/channel.cc
+++ /dev/null
@@ -1,524 +0,0 @@
-// Copyright 2013 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 "mojo/edk/system/channel.h"
-
-#include <algorithm>
-
-#include "base/bind.h"
-#include "base/compiler_specific.h"
-#include "base/logging.h"
-#include "base/macros.h"
-#include "base/strings/stringprintf.h"
-#include "mojo/edk/embedder/platform_handle_vector.h"
-#include "mojo/edk/system/message_pipe_endpoint.h"
-#include "mojo/edk/system/transport_data.h"
-
-namespace mojo {
-namespace system {
-
-static_assert(Channel::kBootstrapEndpointId !=
-                  MessageInTransit::kInvalidEndpointId,
-              "kBootstrapEndpointId is invalid");
-
-STATIC_CONST_MEMBER_DEFINITION const MessageInTransit::EndpointId
-    Channel::kBootstrapEndpointId;
-
-Channel::Channel(embedder::PlatformSupport* platform_support)
-    : platform_support_(platform_support),
-      is_running_(false),
-      is_shutting_down_(false),
-      next_local_id_(kBootstrapEndpointId) {
-}
-
-bool Channel::Init(scoped_ptr<RawChannel> raw_channel) {
-  DCHECK(creation_thread_checker_.CalledOnValidThread());
-  DCHECK(raw_channel);
-
-  // No need to take |lock_|, since this must be called before this object
-  // becomes thread-safe.
-  DCHECK(!is_running_);
-  raw_channel_ = raw_channel.Pass();
-
-  if (!raw_channel_->Init(this)) {
-    raw_channel_.reset();
-    return false;
-  }
-
-  is_running_ = true;
-  return true;
-}
-
-void Channel::Shutdown() {
-  DCHECK(creation_thread_checker_.CalledOnValidThread());
-
-  IdToEndpointMap to_destroy;
-  {
-    base::AutoLock locker(lock_);
-    if (!is_running_)
-      return;
-
-    // Note: Don't reset |raw_channel_|, in case we're being called from within
-    // |OnReadMessage()| or |OnError()|.
-    raw_channel_->Shutdown();
-    is_running_ = false;
-
-    // We need to deal with it outside the lock.
-    std::swap(to_destroy, local_id_to_endpoint_map_);
-  }
-
-  size_t num_live = 0;
-  size_t num_zombies = 0;
-  for (IdToEndpointMap::iterator it = to_destroy.begin();
-       it != to_destroy.end();
-       ++it) {
-    if (it->second->state_ == ChannelEndpoint::STATE_NORMAL) {
-      it->second->OnDisconnect();
-      num_live++;
-    } else {
-      num_zombies++;
-    }
-    it->second->DetachFromChannel();
-  }
-  DVLOG_IF(2, num_live || num_zombies) << "Shut down Channel with " << num_live
-                                       << " live endpoints and " << num_zombies
-                                       << " zombies";
-}
-
-void Channel::WillShutdownSoon() {
-  base::AutoLock locker(lock_);
-  is_shutting_down_ = true;
-}
-
-// Note: |endpoint| being a |scoped_refptr| makes this function safe, since it
-// keeps the endpoint alive even after the lock is released. Otherwise, there's
-// the temptation to simply pass the result of |new ChannelEndpoint(...)|
-// directly to this function, which wouldn't be sufficient for safety.
-MessageInTransit::EndpointId Channel::AttachEndpoint(
-    scoped_refptr<ChannelEndpoint> endpoint) {
-  DCHECK(endpoint.get());
-
-  MessageInTransit::EndpointId local_id;
-  {
-    base::AutoLock locker(lock_);
-
-    DLOG_IF(WARNING, is_shutting_down_)
-        << "AttachEndpoint() while shutting down";
-
-    while (next_local_id_ == MessageInTransit::kInvalidEndpointId ||
-           local_id_to_endpoint_map_.find(next_local_id_) !=
-               local_id_to_endpoint_map_.end())
-      next_local_id_++;
-
-    local_id = next_local_id_;
-    next_local_id_++;
-    local_id_to_endpoint_map_[local_id] = endpoint;
-  }
-
-  endpoint->AttachToChannel(this, local_id);
-  return local_id;
-}
-
-bool Channel::RunMessagePipeEndpoint(MessageInTransit::EndpointId local_id,
-                                     MessageInTransit::EndpointId remote_id) {
-  scoped_refptr<ChannelEndpoint> endpoint;
-  ChannelEndpoint::State state;
-  {
-    base::AutoLock locker(lock_);
-
-    DLOG_IF(WARNING, is_shutting_down_)
-        << "RunMessagePipeEndpoint() while shutting down";
-
-    IdToEndpointMap::const_iterator it =
-        local_id_to_endpoint_map_.find(local_id);
-    if (it == local_id_to_endpoint_map_.end())
-      return false;
-    endpoint = it->second;
-    state = it->second->state_;
-  }
-
-  // Assume that this was in response to |kSubtypeChannelRunMessagePipeEndpoint|
-  // and ignore it.
-  if (state != ChannelEndpoint::STATE_NORMAL) {
-    DVLOG(2) << "Ignoring run message pipe endpoint for zombie endpoint "
-                "(local ID " << local_id << ", remote ID " << remote_id << ")";
-    return true;
-  }
-
-  // TODO(vtl): FIXME -- We need to handle the case that message pipe is already
-  // running when we're here due to |kSubtypeChannelRunMessagePipeEndpoint|).
-  endpoint->Run(remote_id);
-  return true;
-}
-
-void Channel::RunRemoteMessagePipeEndpoint(
-    MessageInTransit::EndpointId local_id,
-    MessageInTransit::EndpointId remote_id) {
-#if DCHECK_IS_ON
-  {
-    base::AutoLock locker(lock_);
-    DCHECK(local_id_to_endpoint_map_.find(local_id) !=
-           local_id_to_endpoint_map_.end());
-  }
-#endif
-
-  if (!SendControlMessage(
-          MessageInTransit::kSubtypeChannelRunMessagePipeEndpoint,
-          local_id,
-          remote_id)) {
-    HandleLocalError(base::StringPrintf(
-        "Failed to send message to run remote message pipe endpoint (local ID "
-        "%u, remote ID %u)",
-        static_cast<unsigned>(local_id),
-        static_cast<unsigned>(remote_id)));
-  }
-}
-
-bool Channel::WriteMessage(scoped_ptr<MessageInTransit> message) {
-  base::AutoLock locker(lock_);
-  if (!is_running_) {
-    // TODO(vtl): I think this is probably not an error condition, but I should
-    // think about it (and the shutdown sequence) more carefully.
-    LOG(WARNING) << "WriteMessage() after shutdown";
-    return false;
-  }
-
-  DLOG_IF(WARNING, is_shutting_down_) << "WriteMessage() while shutting down";
-  return raw_channel_->WriteMessage(message.Pass());
-}
-
-bool Channel::IsWriteBufferEmpty() {
-  base::AutoLock locker(lock_);
-  if (!is_running_)
-    return true;
-  return raw_channel_->IsWriteBufferEmpty();
-}
-
-void Channel::DetachMessagePipeEndpoint(
-    MessageInTransit::EndpointId local_id,
-    MessageInTransit::EndpointId remote_id) {
-  DCHECK_NE(local_id, MessageInTransit::kInvalidEndpointId);
-
-  // If this is non-null after the locked block, the endpoint should be detached
-  // (and no remove message sent).
-  scoped_refptr<ChannelEndpoint> endpoint_to_detach;
-  {
-    base::AutoLock locker_(lock_);
-    if (!is_running_)
-      return;
-
-    IdToEndpointMap::iterator it = local_id_to_endpoint_map_.find(local_id);
-    DCHECK(it != local_id_to_endpoint_map_.end());
-
-    switch (it->second->state_) {
-      case ChannelEndpoint::STATE_NORMAL:
-        it->second->state_ = ChannelEndpoint::STATE_WAIT_REMOTE_REMOVE_ACK;
-        if (remote_id == MessageInTransit::kInvalidEndpointId)
-          return;
-        // We have to send a remove message (outside the lock).
-        break;
-      case ChannelEndpoint::STATE_WAIT_LOCAL_DETACH:
-        endpoint_to_detach = it->second;
-        local_id_to_endpoint_map_.erase(it);
-        // We have to detach (outside the lock).
-        break;
-      case ChannelEndpoint::STATE_WAIT_REMOTE_REMOVE_ACK:
-        NOTREACHED();
-        return;
-    }
-  }
-  if (endpoint_to_detach.get()) {
-    endpoint_to_detach->DetachFromChannel();
-    return;
-  }
-
-  if (!SendControlMessage(
-          MessageInTransit::kSubtypeChannelRemoveMessagePipeEndpoint,
-          local_id,
-          remote_id)) {
-    HandleLocalError(base::StringPrintf(
-        "Failed to send message to remove remote message pipe endpoint (local "
-        "ID %u, remote ID %u)",
-        static_cast<unsigned>(local_id),
-        static_cast<unsigned>(remote_id)));
-  }
-}
-
-size_t Channel::GetSerializedPlatformHandleSize() const {
-  return raw_channel_->GetSerializedPlatformHandleSize();
-}
-
-Channel::~Channel() {
-  // The channel should have been shut down first.
-  DCHECK(!is_running_);
-}
-
-void Channel::OnReadMessage(
-    const MessageInTransit::View& message_view,
-    embedder::ScopedPlatformHandleVectorPtr platform_handles) {
-  DCHECK(creation_thread_checker_.CalledOnValidThread());
-
-  switch (message_view.type()) {
-    case MessageInTransit::kTypeMessagePipeEndpoint:
-    case MessageInTransit::kTypeMessagePipe:
-      OnReadMessageForDownstream(message_view, platform_handles.Pass());
-      break;
-    case MessageInTransit::kTypeChannel:
-      OnReadMessageForChannel(message_view, platform_handles.Pass());
-      break;
-    default:
-      HandleRemoteError(
-          base::StringPrintf("Received message of invalid type %u",
-                             static_cast<unsigned>(message_view.type())));
-      break;
-  }
-}
-
-void Channel::OnError(Error error) {
-  DCHECK(creation_thread_checker_.CalledOnValidThread());
-
-  switch (error) {
-    case ERROR_READ_SHUTDOWN:
-      // The other side was cleanly closed, so this isn't actually an error.
-      DVLOG(1) << "RawChannel read error (shutdown)";
-      break;
-    case ERROR_READ_BROKEN: {
-      base::AutoLock locker(lock_);
-      LOG_IF(ERROR, !is_shutting_down_)
-          << "RawChannel read error (connection broken)";
-      break;
-    }
-    case ERROR_READ_BAD_MESSAGE:
-      // Receiving a bad message means either a bug, data corruption, or
-      // malicious attack (probably due to some other bug).
-      LOG(ERROR) << "RawChannel read error (received bad message)";
-      break;
-    case ERROR_READ_UNKNOWN:
-      LOG(ERROR) << "RawChannel read error (unknown)";
-      break;
-    case ERROR_WRITE:
-      // Write errors are slightly notable: they probably shouldn't happen under
-      // normal operation (but maybe the other side crashed).
-      LOG(WARNING) << "RawChannel write error";
-      break;
-  }
-  Shutdown();
-}
-
-void Channel::OnReadMessageForDownstream(
-    const MessageInTransit::View& message_view,
-    embedder::ScopedPlatformHandleVectorPtr platform_handles) {
-  DCHECK(creation_thread_checker_.CalledOnValidThread());
-  DCHECK(message_view.type() == MessageInTransit::kTypeMessagePipeEndpoint ||
-         message_view.type() == MessageInTransit::kTypeMessagePipe);
-
-  MessageInTransit::EndpointId local_id = message_view.destination_id();
-  if (local_id == MessageInTransit::kInvalidEndpointId) {
-    HandleRemoteError("Received message with no destination ID");
-    return;
-  }
-
-  scoped_refptr<ChannelEndpoint> endpoint;
-  ChannelEndpoint::State state = ChannelEndpoint::STATE_NORMAL;
-  {
-    base::AutoLock locker(lock_);
-
-    // Since we own |raw_channel_|, and this method and |Shutdown()| should only
-    // be called from the creation thread, |raw_channel_| should never be null
-    // here.
-    DCHECK(is_running_);
-
-    IdToEndpointMap::const_iterator it =
-        local_id_to_endpoint_map_.find(local_id);
-    if (it != local_id_to_endpoint_map_.end()) {
-      endpoint = it->second;
-      state = it->second->state_;
-    }
-  }
-  if (!endpoint.get()) {
-    HandleRemoteError(base::StringPrintf(
-        "Received a message for nonexistent local destination ID %u",
-        static_cast<unsigned>(local_id)));
-    // This is strongly indicative of some problem. However, it's not a fatal
-    // error, since it may indicate a buggy (or hostile) remote process. Don't
-    // die even for Debug builds, since handling this properly needs to be
-    // tested (TODO(vtl)).
-    DLOG(ERROR) << "This should not happen under normal operation.";
-    return;
-  }
-
-  // Ignore messages for zombie endpoints (not an error).
-  if (state != ChannelEndpoint::STATE_NORMAL) {
-    DVLOG(2) << "Ignoring downstream message for zombie endpoint (local ID = "
-             << local_id << ", remote ID = " << message_view.source_id() << ")";
-    return;
-  }
-
-  if (!endpoint->OnReadMessage(message_view, platform_handles.Pass())) {
-    HandleLocalError(
-        base::StringPrintf("Failed to enqueue message to local ID %u",
-                           static_cast<unsigned>(local_id)));
-    return;
-  }
-}
-
-void Channel::OnReadMessageForChannel(
-    const MessageInTransit::View& message_view,
-    embedder::ScopedPlatformHandleVectorPtr platform_handles) {
-  DCHECK(creation_thread_checker_.CalledOnValidThread());
-  DCHECK_EQ(message_view.type(), MessageInTransit::kTypeChannel);
-
-  // Currently, no channel messages take platform handles.
-  if (platform_handles) {
-    HandleRemoteError(
-        "Received invalid channel message (has platform handles)");
-    NOTREACHED();
-    return;
-  }
-
-  switch (message_view.subtype()) {
-    case MessageInTransit::kSubtypeChannelRunMessagePipeEndpoint:
-      DVLOG(2) << "Handling channel message to run message pipe (local ID "
-               << message_view.destination_id() << ", remote ID "
-               << message_view.source_id() << ")";
-      if (!RunMessagePipeEndpoint(message_view.destination_id(),
-                                  message_view.source_id())) {
-        HandleRemoteError(
-            "Received invalid channel message to run message pipe");
-      }
-      break;
-    case MessageInTransit::kSubtypeChannelRemoveMessagePipeEndpoint:
-      DVLOG(2) << "Handling channel message to remove message pipe (local ID "
-               << message_view.destination_id() << ", remote ID "
-               << message_view.source_id() << ")";
-      if (!OnRemoveMessagePipeEndpoint(message_view.destination_id(),
-                                       message_view.source_id())) {
-        HandleRemoteError(
-            "Received invalid channel message to remove message pipe");
-      }
-      break;
-    case MessageInTransit::kSubtypeChannelRemoveMessagePipeEndpointAck:
-      DVLOG(2) << "Handling channel message to ack remove message pipe (local "
-                  "ID " << message_view.destination_id() << ", remote ID "
-               << message_view.source_id() << ")";
-      if (!OnRemoveMessagePipeEndpointAck(message_view.destination_id())) {
-        HandleRemoteError(
-            "Received invalid channel message to ack remove message pipe");
-      }
-      break;
-    default:
-      HandleRemoteError("Received invalid channel message");
-      NOTREACHED();
-      break;
-  }
-}
-
-bool Channel::OnRemoveMessagePipeEndpoint(
-    MessageInTransit::EndpointId local_id,
-    MessageInTransit::EndpointId remote_id) {
-  DCHECK(creation_thread_checker_.CalledOnValidThread());
-
-  scoped_refptr<ChannelEndpoint> endpoint;
-  {
-    base::AutoLock locker(lock_);
-
-    IdToEndpointMap::iterator it = local_id_to_endpoint_map_.find(local_id);
-    if (it == local_id_to_endpoint_map_.end()) {
-      DVLOG(2) << "Remove message pipe endpoint error: not found";
-      return false;
-    }
-
-    switch (it->second->state_) {
-      case ChannelEndpoint::STATE_NORMAL:
-        // This is the normal case; we'll proceed on to "wait local detach".
-        break;
-
-      case ChannelEndpoint::STATE_WAIT_LOCAL_DETACH:
-        // We can only be in this state because we got a "remove" already, so
-        // getting another such message is invalid.
-        DVLOG(2) << "Remove message pipe endpoint error: wrong state";
-        return false;
-
-      case ChannelEndpoint::STATE_WAIT_REMOTE_REMOVE_ACK:
-        // Remove messages "crossed"; we have to wait for the ack.
-        return true;
-    }
-
-    it->second->state_ = ChannelEndpoint::STATE_WAIT_LOCAL_DETACH;
-    endpoint = it->second;
-    // Send the remove ack message outside the lock.
-  }
-
-  if (!SendControlMessage(
-          MessageInTransit::kSubtypeChannelRemoveMessagePipeEndpointAck,
-          local_id,
-          remote_id)) {
-    HandleLocalError(base::StringPrintf(
-        "Failed to send message to remove remote message pipe endpoint ack "
-        "(local ID %u, remote ID %u)",
-        static_cast<unsigned>(local_id),
-        static_cast<unsigned>(remote_id)));
-  }
-
-  endpoint->OnDisconnect();
-  return true;
-}
-
-bool Channel::OnRemoveMessagePipeEndpointAck(
-    MessageInTransit::EndpointId local_id) {
-  DCHECK(creation_thread_checker_.CalledOnValidThread());
-
-  scoped_refptr<ChannelEndpoint> endpoint;
-  {
-    base::AutoLock locker(lock_);
-
-    IdToEndpointMap::iterator it = local_id_to_endpoint_map_.find(local_id);
-    if (it == local_id_to_endpoint_map_.end()) {
-      DVLOG(2) << "Remove message pipe endpoint ack error: not found";
-      return false;
-    }
-
-    if (it->second->state_ != ChannelEndpoint::STATE_WAIT_REMOTE_REMOVE_ACK) {
-      DVLOG(2) << "Remove message pipe endpoint ack error: wrong state";
-      return false;
-    }
-
-    endpoint = it->second;
-    local_id_to_endpoint_map_.erase(it);
-    // Detach the endpoint outside the lock.
-  }
-
-  endpoint->DetachFromChannel();
-  return true;
-}
-
-bool Channel::SendControlMessage(MessageInTransit::Subtype subtype,
-                                 MessageInTransit::EndpointId local_id,
-                                 MessageInTransit::EndpointId remote_id) {
-  DVLOG(2) << "Sending channel control message: subtype " << subtype
-           << ", local ID " << local_id << ", remote ID " << remote_id;
-  scoped_ptr<MessageInTransit> message(new MessageInTransit(
-      MessageInTransit::kTypeChannel, subtype, 0, nullptr));
-  message->set_source_id(local_id);
-  message->set_destination_id(remote_id);
-  return WriteMessage(message.Pass());
-}
-
-void Channel::HandleRemoteError(const base::StringPiece& error_message) {
-  // TODO(vtl): Is this how we really want to handle this? Probably we want to
-  // terminate the connection, since it's spewing invalid stuff.
-  LOG(WARNING) << error_message;
-}
-
-void Channel::HandleLocalError(const base::StringPiece& error_message) {
-  // TODO(vtl): Is this how we really want to handle this?
-  // Sometimes we'll want to propagate the error back to the message pipe
-  // (endpoint), and notify it that the remote is (effectively) closed.
-  // Sometimes we'll want to kill the channel (and notify all the endpoints that
-  // their remotes are dead.
-  LOG(WARNING) << error_message;
-}
-
-}  // namespace system
-}  // namespace mojo