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// 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 "third_party/mojo/src/mojo/edk/system/message_pipe_dispatcher.h"
#include "base/logging.h"
#include "third_party/mojo/src/mojo/edk/system/configuration.h"
#include "third_party/mojo/src/mojo/edk/system/local_message_pipe_endpoint.h"
#include "third_party/mojo/src/mojo/edk/system/memory.h"
#include "third_party/mojo/src/mojo/edk/system/message_pipe.h"
#include "third_party/mojo/src/mojo/edk/system/options_validation.h"
#include "third_party/mojo/src/mojo/edk/system/proxy_message_pipe_endpoint.h"
namespace mojo {
namespace system {
const unsigned kInvalidPort = static_cast<unsigned>(-1);
// MessagePipeDispatcher -------------------------------------------------------
// static
const MojoCreateMessagePipeOptions
MessagePipeDispatcher::kDefaultCreateOptions = {
static_cast<uint32_t>(sizeof(MojoCreateMessagePipeOptions)),
MOJO_CREATE_MESSAGE_PIPE_OPTIONS_FLAG_NONE};
// static
MojoResult MessagePipeDispatcher::ValidateCreateOptions(
UserPointer<const MojoCreateMessagePipeOptions> in_options,
MojoCreateMessagePipeOptions* out_options) {
const MojoCreateMessagePipeOptionsFlags kKnownFlags =
MOJO_CREATE_MESSAGE_PIPE_OPTIONS_FLAG_NONE;
*out_options = kDefaultCreateOptions;
if (in_options.IsNull())
return MOJO_RESULT_OK;
UserOptionsReader<MojoCreateMessagePipeOptions> reader(in_options);
if (!reader.is_valid())
return MOJO_RESULT_INVALID_ARGUMENT;
if (!OPTIONS_STRUCT_HAS_MEMBER(MojoCreateMessagePipeOptions, flags, reader))
return MOJO_RESULT_OK;
if ((reader.options().flags & ~kKnownFlags))
return MOJO_RESULT_UNIMPLEMENTED;
out_options->flags = reader.options().flags;
// Checks for fields beyond |flags|:
// (Nothing here yet.)
return MOJO_RESULT_OK;
}
void MessagePipeDispatcher::Init(scoped_refptr<MessagePipe> message_pipe,
unsigned port) {
DCHECK(message_pipe);
DCHECK(port == 0 || port == 1);
message_pipe_ = message_pipe;
port_ = port;
}
Dispatcher::Type MessagePipeDispatcher::GetType() const {
return Type::MESSAGE_PIPE;
}
// static
scoped_refptr<MessagePipeDispatcher>
MessagePipeDispatcher::CreateRemoteMessagePipe(
scoped_refptr<ChannelEndpoint>* channel_endpoint) {
scoped_refptr<MessagePipe> message_pipe(
MessagePipe::CreateLocalProxy(channel_endpoint));
scoped_refptr<MessagePipeDispatcher> dispatcher =
Create(kDefaultCreateOptions);
dispatcher->Init(message_pipe, 0);
return dispatcher;
}
// static
scoped_refptr<MessagePipeDispatcher> MessagePipeDispatcher::Deserialize(
Channel* channel,
const void* source,
size_t size) {
unsigned port = kInvalidPort;
scoped_refptr<MessagePipe> message_pipe;
if (!MessagePipe::Deserialize(channel, source, size, &message_pipe, &port))
return nullptr;
DCHECK(message_pipe);
DCHECK(port == 0 || port == 1);
scoped_refptr<MessagePipeDispatcher> dispatcher =
Create(kDefaultCreateOptions);
dispatcher->Init(message_pipe, port);
return dispatcher;
}
MessagePipeDispatcher::MessagePipeDispatcher() : port_(kInvalidPort) {
}
MessagePipeDispatcher::~MessagePipeDispatcher() {
// |Close()|/|CloseImplNoLock()| should have taken care of the pipe.
DCHECK(!message_pipe_);
}
MessagePipe* MessagePipeDispatcher::GetMessagePipeNoLock() const {
mutex().AssertHeld();
return message_pipe_.get();
}
unsigned MessagePipeDispatcher::GetPortNoLock() const {
mutex().AssertHeld();
return port_;
}
void MessagePipeDispatcher::CancelAllAwakablesNoLock() {
mutex().AssertHeld();
message_pipe_->CancelAllAwakables(port_);
}
void MessagePipeDispatcher::CloseImplNoLock() {
mutex().AssertHeld();
message_pipe_->Close(port_);
message_pipe_ = nullptr;
port_ = kInvalidPort;
}
scoped_refptr<Dispatcher>
MessagePipeDispatcher::CreateEquivalentDispatcherAndCloseImplNoLock() {
mutex().AssertHeld();
// TODO(vtl): Currently, there are no options, so we just use
// |kDefaultCreateOptions|. Eventually, we'll have to duplicate the options
// too.
scoped_refptr<MessagePipeDispatcher> rv = Create(kDefaultCreateOptions);
rv->Init(message_pipe_, port_);
message_pipe_ = nullptr;
port_ = kInvalidPort;
return scoped_refptr<Dispatcher>(rv.get());
}
MojoResult MessagePipeDispatcher::WriteMessageImplNoLock(
UserPointer<const void> bytes,
uint32_t num_bytes,
std::vector<DispatcherTransport>* transports,
MojoWriteMessageFlags flags) {
DCHECK(!transports ||
(transports->size() > 0 &&
transports->size() <= GetConfiguration().max_message_num_handles));
mutex().AssertHeld();
if (num_bytes > GetConfiguration().max_message_num_bytes)
return MOJO_RESULT_RESOURCE_EXHAUSTED;
return message_pipe_->WriteMessage(port_, bytes, num_bytes, transports,
flags);
}
MojoResult MessagePipeDispatcher::ReadMessageImplNoLock(
UserPointer<void> bytes,
UserPointer<uint32_t> num_bytes,
DispatcherVector* dispatchers,
uint32_t* num_dispatchers,
MojoReadMessageFlags flags) {
mutex().AssertHeld();
return message_pipe_->ReadMessage(port_, bytes, num_bytes, dispatchers,
num_dispatchers, flags);
}
HandleSignalsState MessagePipeDispatcher::GetHandleSignalsStateImplNoLock()
const {
mutex().AssertHeld();
return message_pipe_->GetHandleSignalsState(port_);
}
MojoResult MessagePipeDispatcher::AddAwakableImplNoLock(
Awakable* awakable,
MojoHandleSignals signals,
uintptr_t context,
HandleSignalsState* signals_state) {
mutex().AssertHeld();
return message_pipe_->AddAwakable(port_, awakable, signals, context,
signals_state);
}
void MessagePipeDispatcher::RemoveAwakableImplNoLock(
Awakable* awakable,
HandleSignalsState* signals_state) {
mutex().AssertHeld();
message_pipe_->RemoveAwakable(port_, awakable, signals_state);
}
void MessagePipeDispatcher::StartSerializeImplNoLock(
Channel* channel,
size_t* max_size,
size_t* max_platform_handles) {
DCHECK(HasOneRef()); // Only one ref => no need to take the lock.
return message_pipe_->StartSerialize(port_, channel, max_size,
max_platform_handles);
}
bool MessagePipeDispatcher::EndSerializeAndCloseImplNoLock(
Channel* channel,
void* destination,
size_t* actual_size,
embedder::PlatformHandleVector* platform_handles) {
DCHECK(HasOneRef()); // Only one ref => no need to take the lock.
bool rv = message_pipe_->EndSerialize(port_, channel, destination,
actual_size, platform_handles);
message_pipe_ = nullptr;
port_ = kInvalidPort;
return rv;
}
// MessagePipeDispatcherTransport ----------------------------------------------
MessagePipeDispatcherTransport::MessagePipeDispatcherTransport(
DispatcherTransport transport)
: DispatcherTransport(transport) {
DCHECK_EQ(message_pipe_dispatcher()->GetType(),
Dispatcher::Type::MESSAGE_PIPE);
}
} // namespace system
} // namespace mojo
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