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// Copyright 2015 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 "components/html_viewer/web_message_port_channel_impl.h"
#include "base/bind.h"
#include "base/logging.h"
#include "base/strings/string16.h"
#include "third_party/WebKit/public/platform/WebMessagePortChannelClient.h"
#include "third_party/WebKit/public/platform/WebString.h"
#include "third_party/mojo/src/mojo/public/cpp/system/message_pipe.h"
using blink::WebMessagePortChannel;
using blink::WebMessagePortChannelArray;
using blink::WebMessagePortChannelClient;
using blink::WebString;
namespace html_viewer {
void WebMessagePortChannelImpl::CreatePair(
blink::WebMessagePortChannel** channel1,
blink::WebMessagePortChannel** channel2) {
mojo::ScopedMessagePipeHandle pipe1;
mojo::ScopedMessagePipeHandle pipe2;
MojoResult result = mojo::CreateMessagePipe(nullptr, &pipe1, &pipe2);
if (result != MOJO_RESULT_OK) {
NOTREACHED();
return;
}
*channel1 = new WebMessagePortChannelImpl(pipe1.Pass());;
*channel2 = new WebMessagePortChannelImpl(pipe2.Pass());
}
WebMessagePortChannelImpl::WebMessagePortChannelImpl(
mojo::ScopedMessagePipeHandle pipe)
: client_(nullptr), pipe_(pipe.Pass()) {
WaitForNextMessage();
}
WebMessagePortChannelImpl::~WebMessagePortChannelImpl() {
}
void WebMessagePortChannelImpl::setClient(WebMessagePortChannelClient* client) {
client_ = client;
}
void WebMessagePortChannelImpl::destroy() {
setClient(nullptr);
delete this;
}
void WebMessagePortChannelImpl::postMessage(
const WebString& message_as_string,
WebMessagePortChannelArray* channels) {
base::string16 string = message_as_string;
std::vector<MojoHandle> handles;
if (channels) {
for (size_t i = 0; i < channels->size(); ++i) {
WebMessagePortChannelImpl* channel =
static_cast<WebMessagePortChannelImpl*>((*channels)[i]);
handles.push_back(channel->pipe_.release().value());
channel->handle_watcher_.Stop();
}
delete channels;
}
uint32_t num_handles = static_cast<uint32_t>(handles.size());
MojoHandle* handles_ptr = handles.empty() ? nullptr : &handles[0];
MojoResult result = MojoWriteMessage(
pipe_.get().value(), string.c_str(),
static_cast<uint32_t>(string.length() * sizeof(base::char16)),
handles_ptr, num_handles, MOJO_WRITE_MESSAGE_FLAG_NONE);
DCHECK_EQ(MOJO_RESULT_OK, result);
}
bool WebMessagePortChannelImpl::tryGetMessage(
WebString* message,
WebMessagePortChannelArray& channels) {
uint32_t num_bytes = 0;
uint32_t num_handles = 0;
MojoResult result = MojoReadMessage(
pipe_.get().value(), nullptr, &num_bytes, nullptr, &num_handles,
MOJO_READ_MESSAGE_FLAG_NONE);
if (result != MOJO_RESULT_RESOURCE_EXHAUSTED)
return false;
base::string16 message16;
CHECK(num_bytes % sizeof(base::char16) == 0);
message16.resize(num_bytes / sizeof(base::char16));
std::vector<MojoHandle> handles;
handles.resize(num_handles);
MojoHandle* handles_ptr = handles.empty() ? nullptr : &handles[0];
result = MojoReadMessage(
pipe_.get().value(), &message16[0], &num_bytes, handles_ptr, &num_handles,
MOJO_READ_MESSAGE_FLAG_NONE);
if (result != MOJO_RESULT_OK) {
NOTREACHED();
return false;
}
*message = message16;
WebMessagePortChannelArray ports(handles.size());
for (size_t i = 0; i < handles.size(); ++i) {
mojo::MessagePipeHandle mph(handles[i]);
mojo::ScopedMessagePipeHandle handle(mph);
ports[i] = new WebMessagePortChannelImpl(handle.Pass());
}
channels = ports;
return true;
}
void WebMessagePortChannelImpl::WaitForNextMessage() {
handle_watcher_.Start(
pipe_.get(),
MOJO_HANDLE_SIGNAL_READABLE,
MOJO_DEADLINE_INDEFINITE,
base::Bind(&WebMessagePortChannelImpl::OnMessageAvailable,
base::Unretained(this)));
}
void WebMessagePortChannelImpl::OnMessageAvailable(MojoResult result) {
DCHECK_EQ(MOJO_RESULT_OK, result);
client_->messageAvailable();
WaitForNextMessage();
}
} // namespace html_viewer
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