media/mtransport/rlogconnector.h
author Lina Cambridge <lina@yakshaving.ninja>
Tue, 02 Apr 2019 18:49:21 +0000
changeset 467645 db20a3f4324ec9fc29bb21bda77672e7e7640529
parent 448966 6f3709b3878117466168c40affa7bca0b60cf75b
child 479854 9ddd406ee10f801da4de1b4816fe0c7a6bcf2640
permissions -rw-r--r--
Bug 1539104 - Add a way to detect supported storage connection operations. r=mak In retrospect, overloading `Connection::connectionReady` to mean "is ready _and_ supports this operation" wasn't a good idea. This commit reverts that change (cfd44c936a9b), and adds two new methods: * `Connection::operationSupported`, to check if a connection supports sync or async operations. This method is public. * `Connection::ensureOperationSupported`, that asserts or returns an error if the connection doesn't support an operation. This is private. `operationSupported` is used by callers like `Service::minimizeMemory` to detect if the connection supports sync operations, since both sync and async connections implement `mozIStorageConnection` now. Finally, some callers used `!mDBConn` to check if the connection was ready, while others used `connectionReady()`. This commit changes them to use the latter. Differential Revision: https://phabricator.services.mozilla.com/D24974

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

// Some of this code is cut-and-pasted from nICEr. Copyright is:

/*
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  contributors may be used to endorse or promote products derived from
  this software without specific prior written permission.

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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

/* Original author: bcampen@mozilla.com */

/*
   This file defines an r_dest_vlog that can be used to accumulate log messages
   for later inspection/filtering. The intent is to use this for interactive
   debug purposes on an about:webrtc page or similar.
*/

#ifndef rlogconnector_h__
#define rlogconnector_h__

#include <stdint.h>

#include <deque>
#include <string>
#include <vector>

#include "mozilla/Mutex.h"

#include "m_cpp_utils.h"

namespace mozilla {

class RLogConnector {
 public:
  /*
     NB: These are not threadsafe, nor are they safe to call during static
     init/deinit.
  */
  static RLogConnector* CreateInstance();
  static RLogConnector* GetInstance();
  static void DestroyInstance();

  /*
     Retrieves log statements that match a given substring, subject to a
     limit. |matching_logs| will be filled in chronological order (front()
     is oldest, back() is newest). |limit| == 0 will be interpreted as no
     limit.
  */
  void Filter(const std::string& substring, uint32_t limit,
              std::deque<std::string>* matching_logs);

  void FilterAny(const std::vector<std::string>& substrings, uint32_t limit,
                 std::deque<std::string>* matching_logs);

  inline void GetAny(uint32_t limit, std::deque<std::string>* matching_logs) {
    Filter("", limit, matching_logs);
  }

  void SetLogLimit(uint32_t new_limit);
  void Log(int level, std::string&& log);
  void Clear();

  // Methods to signal when a PeerConnection exists in a Private Window.
  void EnterPrivateMode();
  void ExitPrivateMode();

 private:
  RLogConnector();
  ~RLogConnector();
  void RemoveOld();
  void AddMsg(std::string&& msg);

  static RLogConnector* instance;

  /*
   * Might be worthwhile making this a circular buffer, but I think it is
   * preferable to take up as little space as possible if no logging is
   * happening/the ringbuffer is not being used.
   */
  std::deque<std::string> log_messages_;
  /* Max size of log buffer (should we use time-depth instead/also?) */
  uint32_t log_limit_;
  OffTheBooksMutex mutex_;
  uint32_t disableCount_;

  DISALLOW_COPY_ASSIGN(RLogConnector);
};  // class RLogConnector

}  // namespace mozilla

#endif  // rlogconnector_h__