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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "chrome/browser/media/webrtc_log_util.h"
      6 
      7 #include "base/file_util.h"
      8 #include "base/files/file_enumerator.h"
      9 #include "base/logging.h"
     10 #include "base/time/time.h"
     11 #include "chrome/browser/browser_process.h"
     12 #include "chrome/browser/media/webrtc_log_list.h"
     13 #include "chrome/browser/profiles/profile.h"
     14 #include "chrome/browser/profiles/profile_manager.h"
     15 #include "content/public/browser/browser_thread.h"
     16 
     17 namespace {
     18 
     19 const int kDaysToKeepLogs = 5;
     20 
     21 // Remove any empty entries from the log list. One line is one log entry, see
     22 // WebRtcLogUploader::AddLocallyStoredLogInfoToUploadListFile for more
     23 // information about the format.
     24 void RemoveEmptyEntriesInLogList(std::string* log_list) {
     25   static const char kEmptyLine[] = ",,\n";
     26   size_t pos = 0;
     27   do {
     28     pos = log_list->find(kEmptyLine, pos);
     29     if (pos == std::string::npos)
     30       break;
     31     DCHECK(pos == 0 || (*log_list)[pos - 1] == '\n');
     32     log_list->erase(pos, arraysize(kEmptyLine) - 1);
     33   } while (true);
     34 }
     35 
     36 }  // namespace
     37 
     38 // static
     39 void WebRtcLogUtil::DeleteOldWebRtcLogFiles(const base::FilePath& log_dir) {
     40   DeleteOldAndRecentWebRtcLogFiles(log_dir, base::Time::Max());
     41 }
     42 
     43 // static
     44 void WebRtcLogUtil::DeleteOldAndRecentWebRtcLogFiles(
     45     const base::FilePath& log_dir,
     46     const base::Time& delete_begin_time) {
     47   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::FILE));
     48 
     49   if (!base::PathExists(log_dir)) {
     50     // This will happen if no logs have been stored or uploaded.
     51     DVLOG(3) << "Could not find directory: " << log_dir.value();
     52     return;
     53   }
     54 
     55   const base::Time now = base::Time::Now();
     56   const base::TimeDelta time_to_keep_logs =
     57       base::TimeDelta::FromDays(kDaysToKeepLogs);
     58 
     59   base::FilePath log_list_path =
     60       WebRtcLogList::GetWebRtcLogListFileForDirectory(log_dir);
     61   std::string log_list;
     62   const bool update_log_list = base::PathExists(log_list_path);
     63   if (update_log_list) {
     64     bool read_ok = base::ReadFileToString(log_list_path, &log_list);
     65     DPCHECK(read_ok);
     66   }
     67 
     68   base::FileEnumerator log_files(log_dir, false, base::FileEnumerator::FILES);
     69   bool delete_ok = true;
     70   for (base::FilePath name = log_files.Next(); !name.empty();
     71        name = log_files.Next()) {
     72     if (name == log_list_path)
     73       continue;
     74     base::FileEnumerator::FileInfo file_info(log_files.GetInfo());
     75     base::TimeDelta file_age = now - file_info.GetLastModifiedTime();
     76     if (file_age > time_to_keep_logs ||
     77         (!delete_begin_time.is_max() &&
     78          file_info.GetLastModifiedTime() > delete_begin_time)) {
     79       if (!base::DeleteFile(name, false))
     80         delete_ok = false;
     81 
     82       // Remove the local ID from the log list file. The ID is guaranteed to be
     83       // unique.
     84       std::string id = file_info.GetName().RemoveExtension().MaybeAsASCII();
     85       size_t id_pos = log_list.find(id);
     86       if (id_pos == std::string::npos)
     87         continue;
     88       log_list.erase(id_pos, id.size());
     89     }
     90   }
     91 
     92   if (!delete_ok)
     93     LOG(WARNING) << "Could not delete all old WebRTC logs.";
     94 
     95   RemoveEmptyEntriesInLogList(&log_list);
     96 
     97   if (update_log_list) {
     98     int written = base::WriteFile(log_list_path, &log_list[0], log_list.size());
     99     DPCHECK(written == static_cast<int>(log_list.size()));
    100   }
    101 }
    102 
    103 // static
    104 void WebRtcLogUtil::DeleteOldWebRtcLogFilesForAllProfiles() {
    105   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
    106 
    107   ProfileInfoCache& profile_cache =
    108       g_browser_process->profile_manager()->GetProfileInfoCache();
    109   size_t profiles_count = profile_cache.GetNumberOfProfiles();
    110   for (size_t i = 0; i < profiles_count; ++i) {
    111     content::BrowserThread::PostTask(
    112         content::BrowserThread::FILE,
    113         FROM_HERE,
    114         base::Bind(&DeleteOldWebRtcLogFiles,
    115                    WebRtcLogList::GetWebRtcLogDirectoryForProfile(
    116                        profile_cache.GetPathOfProfileAtIndex(i))));
    117   }
    118 }
    119