// Copyright (c) 2012 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 "chrome/browser/net/chrome_net_log.h"

#include <stdio.h>

#include "base/command_line.h"
#include "base/files/scoped_file.h"
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/values.h"
#include "chrome/browser/net/net_log_temp_file.h"
#include "chrome/browser/ui/webui/net_internals/net_internals_ui.h"
#include "chrome/common/chrome_switches.h"
#include "content/public/common/content_switches.h"
#include "net/log/net_log_logger.h"
#include "net/log/trace_net_log_observer.h"

ChromeNetLog::ChromeNetLog()
    : net_log_temp_file_(new NetLogTempFile(this)) {
  const base::CommandLine* command_line =
      base::CommandLine::ForCurrentProcess();

  if (command_line->HasSwitch(switches::kLogNetLog)) {
    base::FilePath log_path =
        command_line->GetSwitchValuePath(switches::kLogNetLog);
    // Much like logging.h, bypass threading restrictions by using fopen
    // directly.  Have to write on a thread that's shutdown to handle events on
    // shutdown properly, and posting events to another thread as they occur
    // would result in an unbounded buffer size, so not much can be gained by
    // doing this on another thread.  It's only used when debugging Chrome, so
    // performance is not a big concern.
    base::ScopedFILE file;
#if defined(OS_WIN)
    file.reset(_wfopen(log_path.value().c_str(), L"w"));
#elif defined(OS_POSIX)
    file.reset(fopen(log_path.value().c_str(), "w"));
#endif

    if (!file) {
      LOG(ERROR) << "Could not open file " << log_path.value()
                 << " for net logging";
    } else {
      scoped_ptr<base::Value> constants(NetInternalsUI::GetConstants());
      net_log_logger_.reset(new net::NetLogLogger());
      if (command_line->HasSwitch(switches::kNetLogLevel)) {
        std::string log_level_string =
            command_line->GetSwitchValueASCII(switches::kNetLogLevel);
        int command_line_log_level;
        if (base::StringToInt(log_level_string, &command_line_log_level) &&
            command_line_log_level >= LOG_ALL &&
            command_line_log_level <= LOG_NONE) {
          net_log_logger_->set_log_level(
              static_cast<LogLevel>(command_line_log_level));
        }
      }
      net_log_logger_->StartObserving(this, file.Pass(), constants.get(),
                                      nullptr);
    }
  }

  trace_net_log_observer_.reset(new net::TraceNetLogObserver());
  trace_net_log_observer_->WatchForTraceStart(this);
}

ChromeNetLog::~ChromeNetLog() {
  net_log_temp_file_.reset();
  // Remove the observers we own before we're destroyed.
  if (net_log_logger_)
    net_log_logger_->StopObserving(nullptr);
  if (trace_net_log_observer_)
    trace_net_log_observer_->StopWatchForTraceStart();
}