Separates ipc code from common (http://crbug.com/16829)

ipc/ipc_logging.cc

Index: ipc/ipc_logging.cc
diff --git a/ipc/ipc_logging.cc b/ipc/ipc_logging.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4ecb7d9a91e01e408483878d6ef3344a78ddf348
--- /dev/null
+++ b/ipc/ipc_logging.cc
@@ -0,0 +1,309 @@
+// Copyright (c) 2006-2008 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 "ipc/ipc_logging.h"
+
+#if defined(OS_POSIX)
+#ifdef IPC_MESSAGE_LOG_ENABLED
+// This will cause render_messages.h etc to define ViewMsgLog and friends.
+#define IPC_MESSAGE_MACROS_LOG_ENABLED
+#endif
+#endif
+
+#include "base/command_line.h"
+#include "base/logging.h"
+#include "base/message_loop.h"
+#include "base/string_util.h"
+#include "base/thread.h"
+#include "base/time.h"
+#include "base/waitable_event.h"
+#include "base/waitable_event_watcher.h"
+#include "ipc/ipc_switches.h"
+#include "ipc/ipc_sync_message.h"
+#include "ipc/ipc_message_utils.h"
+
+#if defined(OS_POSIX)
+#include "base/string_util.h"
+#include <unistd.h>
+#endif
+
+#ifdef IPC_MESSAGE_LOG_ENABLED
+
+using base::Time;
+
+// IPC::Logging is allocated as a singleton, so we don't need any kind of
+// special retention program.
+template <>
+struct RunnableMethodTraits<IPC::Logging> {
+  static void RetainCallee(IPC::Logging*) {}
+  static void ReleaseCallee(IPC::Logging*) {}
+};
+
+namespace IPC {
+
+const wchar_t kLoggingEventName[] = L"ChromeIPCLog.%d";
+const int kLogSendDelayMs = 100;
+
+// We use a pointer to the function table to avoid any linker dependencies on
+// all the traits used as IPC message parameters.
+Logging::LogFunction *Logging::log_function_mapping_;
+
+Logging::Logging()
+    : logging_event_on_(NULL),
+      logging_event_off_(NULL),
+      enabled_(false),
+      queue_invoke_later_pending_(false),
+      sender_(NULL),
+      main_thread_(MessageLoop::current()),
+      consumer_(NULL) {
+  // Create an event for this browser instance that's set when logging is
+  // enabled, so child processes can know when logging is enabled.
+
+#if defined(OS_WIN)
+  // On Windows we have a couple of named events which switch logging on and
+  // off.
+  int browser_pid;
+  const CommandLine& parsed_command_line = *CommandLine::ForCurrentProcess();
+  std::wstring process_type =
+    parsed_command_line.GetSwitchValue(switches::kProcessType);
+  if (process_type.empty()) {
+    browser_pid = GetCurrentProcessId();
+  } else {
+    std::wstring channel_name =
+        parsed_command_line.GetSwitchValue(switches::kProcessChannelID);
+
+    browser_pid = _wtoi(channel_name.c_str());
+    DCHECK(browser_pid != 0);
+  }
+
+  std::wstring event_name = GetEventName(browser_pid, true);
+  logging_event_on_.reset(new base::WaitableEvent(
+      CreateEvent(NULL, TRUE, FALSE, event_name.c_str())));
+
+  event_name = GetEventName(browser_pid, false);
+  logging_event_off_.reset(new base::WaitableEvent(
+      CreateEvent(NULL, TRUE, FALSE, event_name.c_str())));
+
+  RegisterWaitForEvent(true);
+#elif defined(OS_POSIX)
+  if (getenv("CHROME_IPC_LOGGING"))
+    enabled_ = true;
+#endif
+
+  MessageLoop::current()->AddDestructionObserver(this);
+}
+
+Logging::~Logging() {
+}
+
+Logging* Logging::current() {
+  return Singleton<Logging>::get();
+}
+
+void Logging::RegisterWaitForEvent(bool enabled) {
+  watcher_.StopWatching();
+  watcher_.StartWatching(
+      enabled ? logging_event_on_.get() : logging_event_off_.get(), this);
+}
+
+void Logging::OnWaitableEventSignaled(base::WaitableEvent* event) {
+  enabled_ = event == logging_event_on_.get();
+  RegisterWaitForEvent(!enabled_);
+}
+
+void Logging::WillDestroyCurrentMessageLoop() {
+  watcher_.StopWatching();
+}
+
+void Logging::SetLoggerFunctions(LogFunction *functions) {
+  log_function_mapping_ = functions;
+}
+
+#if defined(OS_WIN)
+std::wstring Logging::GetEventName(bool enabled) {
+  return current()->GetEventName(GetCurrentProcessId(), enabled);
+}
+#endif
+
+std::wstring Logging::GetEventName(int browser_pid, bool enabled) {
+  std::wstring result = StringPrintf(kLoggingEventName, browser_pid);
+  result += enabled ? L"on" : L"off";
+  return result;
+}
+
+void Logging::SetConsumer(Consumer* consumer) {
+  consumer_ = consumer;
+}
+
+void Logging::Enable() {
+  logging_event_off_->Reset();
+  logging_event_on_->Signal();
+}
+
+void Logging::Disable() {
+  logging_event_on_->Reset();
+  logging_event_off_->Signal();
+}
+
+void Logging::OnSendLogs() {
+  queue_invoke_later_pending_ = false;
+  if (!sender_)
+    return;
+
+  Message* msg = new Message(
+      MSG_ROUTING_CONTROL, IPC_LOGGING_ID, Message::PRIORITY_NORMAL);
+  WriteParam(msg, queued_logs_);
+  queued_logs_.clear();
+  sender_->Send(msg);
+}
+
+void Logging::SetIPCSender(IPC::Message::Sender* sender) {
+  sender_ = sender;
+}
+
+void Logging::OnReceivedLoggingMessage(const Message& message) {
+  std::vector<LogData> data;
+  void* iter = NULL;
+  if (!ReadParam(&message, &iter, &data))
+    return;
+
+  for (size_t i = 0; i < data.size(); ++i) {
+    Log(data[i]);
+  }
+}
+
+void Logging::OnSendMessage(Message* message, const std::string& channel_id) {
+  if (!Enabled())
+    return;
+
+  if (message->is_reply()) {
+    LogData* data = message->sync_log_data();
+    if (!data)
+      return;
+
+    // This is actually the delayed reply to a sync message.  Create a string
+    // of the output parameters, add it to the LogData that was earlier stashed
+    // with the reply, and log the result.
+    data->channel = channel_id;
+    GenerateLogData("", *message, data);
+    Log(*data);
+    delete data;
+    message->set_sync_log_data(NULL);
+  } else {
+    // If the time has already been set (i.e. by ChannelProxy), keep that time
+    // instead as it's more accurate.
+    if (!message->sent_time())
+      message->set_sent_time(Time::Now().ToInternalValue());
+  }
+}
+
+void Logging::OnPreDispatchMessage(const Message& message) {
+  message.set_received_time(Time::Now().ToInternalValue());
+}
+
+void Logging::OnPostDispatchMessage(const Message& message,
+                                    const std::string& channel_id) {
+  if (!Enabled() ||
+#if defined(OS_WIN)
+      !message.sent_time() ||
+#endif
+      message.dont_log())
+    return;
+
+  LogData data;
+  GenerateLogData(channel_id, message, &data);
+
+  if (MessageLoop::current() == main_thread_) {
+    Log(data);
+  } else {
+    main_thread_->PostTask(FROM_HERE, NewRunnableMethod(
+        this, &Logging::Log, data));
+  }
+}
+
+void Logging::GetMessageText(uint16 type, std::wstring* name,
+                             const Message* message,
+                             std::wstring* params) {
+  if (!log_function_mapping_)
+    return;
+
+  int message_class = type >> 12;
+  if (log_function_mapping_[message_class] != NULL) {
+    log_function_mapping_[message_class](type, name, message, params);
+  } else {
+    DLOG(INFO) << "No logger function associated with message class " <<
+        message_class;
+  }
+}
+
+void Logging::Log(const LogData& data) {
+#if defined(OS_WIN)
+  if (consumer_) {
+    // We're in the browser process.
+    consumer_->Log(data);
+  } else {
+    // We're in the renderer or plugin processes.
+    if (sender_) {
+      queued_logs_.push_back(data);
+      if (!queue_invoke_later_pending_) {
+        queue_invoke_later_pending_ = true;
+        MessageLoop::current()->PostDelayedTask(FROM_HERE, NewRunnableMethod(
+            this, &Logging::OnSendLogs), kLogSendDelayMs);
+      }
+    }
+  }
+#elif defined(OS_POSIX)
+  // On POSIX, for now, we just dump the log to stderr
+  fprintf(stderr, "ipc %s %d %d %s %s %s\n",
+          data.channel.c_str(),
+          data.routing_id,
+          data.type,
+          WideToUTF8(data.flags).c_str(),
+          WideToUTF8(data.message_name).c_str(),
+          WideToUTF8(data.params).c_str());
+#endif
+}
+
+void GenerateLogData(const std::string& channel, const Message& message,
+                     LogData* data) {
+  if (message.is_reply()) {
+    // "data" should already be filled in.
+    std::wstring params;
+    Logging::GetMessageText(data->type, NULL, &message, &params);
+
+    if (!data->params.empty() && !params.empty())
+      data->params += L", ";
+
+    data->flags += L" DR";
+
+    data->params += params;
+  } else {
+    std::wstring flags;
+    if (message.is_sync())
+      flags = L"S";
+
+    if (message.is_reply())
+      flags += L"R";
+
+    if (message.is_reply_error())
+      flags += L"E";
+
+    std::wstring params, message_name;
+    Logging::GetMessageText(message.type(), &message_name, &message, &params);
+
+    data->channel = channel;
+    data->routing_id = message.routing_id();
+    data->type = message.type();
+    data->flags = flags;
+    data->sent = message.sent_time();
+    data->receive = message.received_time();
+    data->dispatch = Time::Now().ToInternalValue();
+    data->params = params;
+    data->message_name = message_name;
+  }
+}
+
+}
+
+#endif  // IPC_MESSAGE_LOG_ENABLED