media/mtransport/rlogconnector.h
author Jean-Yves Avenard <jyavenard@mozilla.com>
Mon, 12 Nov 2018 01:09:03 +0000
changeset 505066 6f08cc82afe3280863c897dda1e141d8c4c165d7
parent 363145 28cab19aa7f1cd9a5801e18b580e2bc46eb4cf24
child 508163 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1505910 - P2. Remove use of AsTaskQueue(). r=cpearce Make IsCurrentThreadIn() const. Depends on D11491 Differential Revision: https://phabricator.services.mozilla.com/D11492

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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/. */

// 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
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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__