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// Copyright 2014 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/spy/spy.h"
#include "base/bind.h"
#include "base/compiler_specific.h"
#include "base/location.h"
#include "base/memory/ref_counted.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/threading/thread.h"
#include "base/threading/worker_pool.h"
#include "mojo/public/cpp/system/core.h"
#include "mojo/service_manager/service_manager.h"
#include "mojo/spy/websocket_server.h"
namespace {
const size_t kMessageBufSize = 2 * 1024;
const size_t kHandleBufSize = 64;
const int kDefaultWebSocketPort = 42424;
void CloseHandles(MojoHandle* handles, size_t count) {
for (size_t ix = 0; ix != count; ++count)
MojoClose(handles[ix]);
}
// In charge of processing messages that flow over a
// single message pipe.
class MessageProcessor :
public base::RefCountedThreadSafe<MessageProcessor> {
public:
MessageProcessor()
: last_result_(MOJO_RESULT_OK),
bytes_transfered_(0) {
message_count_[0] = 0;
message_count_[1] = 0;
handle_count_[0] = 0;
handle_count_[1] = 0;
}
void Start(mojo::ScopedMessagePipeHandle client,
mojo::ScopedMessagePipeHandle interceptor) {
std::vector<mojo::MessagePipeHandle> pipes;
pipes.push_back(client.get());
pipes.push_back(interceptor.get());
std::vector<MojoWaitFlags> wait_flags;
wait_flags.push_back(MOJO_WAIT_FLAG_READABLE);
wait_flags.push_back(MOJO_WAIT_FLAG_READABLE);
scoped_ptr<char[]> mbuf(new char[kMessageBufSize]);
scoped_ptr<MojoHandle[]> hbuf(new MojoHandle[kHandleBufSize]);
// Main processing loop:
// 1- Wait for an endpoint to have a message.
// 2- Read the message
// 3- Log data
// 4- Wait until the opposite port is ready for writting
// 4- Write the message to opposite port.
for (;;) {
int r = WaitMany(pipes, wait_flags, MOJO_DEADLINE_INDEFINITE);
if ((r < 0) || (r > 1)) {
last_result_ = r;
break;
}
uint32_t bytes_read = kMessageBufSize;
uint32_t handles_read = kHandleBufSize;
if (!CheckResult(ReadMessageRaw(pipes[r],
mbuf.get(), &bytes_read,
hbuf.get(), &handles_read,
MOJO_READ_MESSAGE_FLAG_NONE)))
break;
if (!bytes_read && !handles_read)
continue;
if (handles_read)
handle_count_[r] += handles_read;
++message_count_[r];
bytes_transfered_ += bytes_read;
mojo::MessagePipeHandle write_handle = (r == 0) ? pipes[1] : pipes[0];
if (!CheckResult(Wait(write_handle,
MOJO_WAIT_FLAG_WRITABLE,
MOJO_DEADLINE_INDEFINITE)))
break;
if (!CheckResult(WriteMessageRaw(write_handle,
mbuf.get(), bytes_read,
hbuf.get(), handles_read,
MOJO_WRITE_MESSAGE_FLAG_NONE))) {
// On failure we own the handles. For now just close them.
if (handles_read)
CloseHandles(hbuf.get(), handles_read);
break;
}
}
}
private:
friend class base::RefCountedThreadSafe<MessageProcessor>;
virtual ~MessageProcessor() {}
bool CheckResult(MojoResult mr) {
if (mr == MOJO_RESULT_OK)
return true;
last_result_ = mr;
return false;
}
MojoResult last_result_;
uint32_t bytes_transfered_;
uint32_t message_count_[2];
uint32_t handle_count_[2];
};
// In charge of intercepting access to the service manager.
class SpyInterceptor : public mojo::ServiceManager::Interceptor {
private:
virtual mojo::ScopedMessagePipeHandle OnConnectToClient(
const GURL& url, mojo::ScopedMessagePipeHandle real_client) OVERRIDE {
if (!MustIntercept(url))
return real_client.Pass();
// You can get an invalid handle if the app (or service) is
// created by unconventional means, for example the command line.
if (!real_client.is_valid())
return real_client.Pass();
mojo::ScopedMessagePipeHandle faux_client;
mojo::ScopedMessagePipeHandle interceptor;
CreateMessagePipe(&faux_client, &interceptor);
scoped_refptr<MessageProcessor> processor = new MessageProcessor();
base::WorkerPool::PostTask(
FROM_HERE,
base::Bind(&MessageProcessor::Start,
processor,
base::Passed(&real_client), base::Passed(&interceptor)),
true);
return faux_client.Pass();
}
bool MustIntercept(const GURL& url) {
// TODO(cpu): manage who and when to intercept.
return true;
}
};
spy::WebSocketServer* ws_server = NULL;
void StartServer(int port) {
// TODO(cpu) figure out lifetime of the server. See Spy() dtor.
ws_server = new spy::WebSocketServer(port);
ws_server->Start();
}
struct SpyOptions {
int websocket_port;
SpyOptions()
: websocket_port(kDefaultWebSocketPort) {
}
};
SpyOptions ProcessOptions(const std::string& options) {
SpyOptions spy_options;
if (options.empty())
return spy_options;
base::StringPairs kv_pairs;
base::SplitStringIntoKeyValuePairs(options, ':', ',', &kv_pairs);
base::StringPairs::iterator it = kv_pairs.begin();
for (; it != kv_pairs.end(); ++it) {
if (it->first == "port") {
int port;
if (base::StringToInt(it->second, &port))
spy_options.websocket_port = port;
}
}
return spy_options;
}
} // namespace
namespace mojo {
Spy::Spy(mojo::ServiceManager* service_manager, const std::string& options) {
SpyOptions spy_options = ProcessOptions(options);
// Start the tread what will accept commands from the frontend.
control_thread_.reset(new base::Thread("mojo_spy_control_thread"));
base::Thread::Options thread_options(base::MessageLoop::TYPE_IO, 0);
control_thread_->StartWithOptions(thread_options);
control_thread_->message_loop_proxy()->PostTask(
FROM_HERE, base::Bind(&StartServer, spy_options.websocket_port));
// Start intercepting mojo services.
service_manager->SetInterceptor(new SpyInterceptor());
}
Spy::~Spy(){
// TODO(cpu): Do not leak the interceptor. Lifetime between the
// service_manager and the spy is still unclear hence the leak.
}
} // namespace mojo
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