1 files changed, 186 insertions, 0 deletions
diff --git a/dom/media/webrtc/transport/rlogconnector.cpp b/dom/media/webrtc/transport/rlogconnector.cpp
new file mode 100644
index 0000000000..bdb58aac56
--- /dev/null
+++ b/dom/media/webrtc/transport/rlogconnector.cpp
@@ -0,0 +1,186 @@
+/* -*- 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/. */
+
+/* Original author: bcampen@mozilla.com */
+
+#include "rlogconnector.h"
+
+#include <cstdarg>
+#include <deque>
+#include <string>
+#include <utility>  // Pinch hitting for <utility> and std::move
+#include <vector>
+
+#include "logging.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/Mutex.h"
+#include "mozilla/Sprintf.h"
+
+extern "C" {
+#include <csi_platform.h>
+#include "r_log.h"
+#include "registry.h"
+}
+
+/* Matches r_dest_vlog type defined in r_log.h */
+static int ringbuffer_vlog(int facility, int level, const char* format,
+                           va_list ap) {
+  if (mozilla::RLogConnector::GetInstance()->ShouldLog(level)) {
+    // I could be evil and printf right into a std::string, but unless this
+    // shows up in profiling, it is not worth doing.
+    char temp[4096];
+    VsprintfLiteral(temp, format, ap);
+
+    mozilla::RLogConnector::GetInstance()->Log(level, std::string(temp));
+  }
+  return 0;
+}
+
+static mozilla::LogLevel rLogLvlToMozLogLvl(int level) {
+  switch (level) {
+    case LOG_EMERG:
+    case LOG_ALERT:
+    case LOG_CRIT:
+    case LOG_ERR:
+      return mozilla::LogLevel::Error;
+    case LOG_WARNING:
+      return mozilla::LogLevel::Warning;
+    case LOG_NOTICE:
+      return mozilla::LogLevel::Info;
+    case LOG_INFO:
+      return mozilla::LogLevel::Debug;
+    case LOG_DEBUG:
+    default:
+      return mozilla::LogLevel::Verbose;
+  }
+}
+
+MOZ_MTLOG_MODULE("nicer");
+
+namespace mozilla {
+
+RLogConnector* RLogConnector::instance;
+
+RLogConnector::RLogConnector()
+    : log_limit_(4096), mutex_("RLogConnector::mutex_"), disableCount_(0) {}
+
+RLogConnector::~RLogConnector() = default;
+
+void RLogConnector::SetLogLimit(uint32_t new_limit) {
+  OffTheBooksMutexAutoLock lock(mutex_);
+  log_limit_ = new_limit;
+  RemoveOld();
+}
+
+bool RLogConnector::ShouldLog(int level) const {
+  return level <= LOG_INFO ||
+         MOZ_LOG_TEST(getLogModule(), rLogLvlToMozLogLvl(level));
+}
+
+void RLogConnector::Log(int level, std::string&& log) {
+  MOZ_MTLOG(rLogLvlToMozLogLvl(level), log);
+  OffTheBooksMutexAutoLock lock(mutex_);
+  if (disableCount_ == 0) {
+    AddMsg(std::move(log));
+  }
+}
+
+void RLogConnector::AddMsg(std::string&& msg) {
+  log_messages_.push_front(std::move(msg));
+  RemoveOld();
+}
+
+inline void RLogConnector::RemoveOld() {
+  if (log_messages_.size() > log_limit_) {
+    log_messages_.resize(log_limit_);
+  }
+}
+
+RLogConnector* RLogConnector::CreateInstance() {
+  if (!instance) {
+    instance = new RLogConnector;
+    NR_reg_init(NR_REG_MODE_LOCAL);
+    r_log_set_extra_destination(LOG_DEBUG, &ringbuffer_vlog);
+  }
+  return instance;
+}
+
+RLogConnector* RLogConnector::GetInstance() { return instance; }
+
+void RLogConnector::DestroyInstance() {
+  // First param is ignored when passing null
+  r_log_set_extra_destination(LOG_DEBUG, nullptr);
+  delete instance;
+  instance = nullptr;
+}
+
+// As long as at least one PeerConnection exists in a Private Window rlog
+// messages will not be saved in the RLogConnector. This is necessary because
+// the log_messages buffer is shared across all instances of
+// PeerConnectionImpls. There is no way with the current structure of r_log to
+// run separate logs.
+
+void RLogConnector::EnterPrivateMode() {
+  OffTheBooksMutexAutoLock lock(mutex_);
+  ++disableCount_;
+  MOZ_ASSERT(disableCount_ != 0);
+
+  if (disableCount_ == 1) {
+    AddMsg("LOGGING SUSPENDED: a connection is active in a Private Window ***");
+  }
+}
+
+void RLogConnector::ExitPrivateMode() {
+  OffTheBooksMutexAutoLock lock(mutex_);
+  MOZ_ASSERT(disableCount_ != 0);
+
+  if (--disableCount_ == 0) {
+    AddMsg(
+        "LOGGING RESUMED: no connections are active in a Private Window ***");
+  }
+}
+
+void RLogConnector::Clear() {
+  OffTheBooksMutexAutoLock lock(mutex_);
+  log_messages_.clear();
+}
+
+void RLogConnector::Filter(const std::string& substring, uint32_t limit,
+                           std::deque<std::string>* matching_logs) {
+  std::vector<std::string> substrings;
+  substrings.push_back(substring);
+  FilterAny(substrings, limit, matching_logs);
+}
+
+inline bool AnySubstringMatches(const std::vector<std::string>& substrings,
+                                const std::string& string) {
+  for (auto sub = substrings.begin(); sub != substrings.end(); ++sub) {
+    if (string.find(*sub) != std::string::npos) {
+      return true;
+    }
+  }
+  return false;
+}
+
+void RLogConnector::FilterAny(const std::vector<std::string>& substrings,
+                              uint32_t limit,
+                              std::deque<std::string>* matching_logs) {
+  OffTheBooksMutexAutoLock lock(mutex_);
+  if (limit == 0) {
+    // At a max, all of the log messages.
+    limit = log_limit_;
+  }
+
+  for (auto log = log_messages_.begin();
+       log != log_messages_.end() && matching_logs->size() < limit; ++log) {
+    if (AnySubstringMatches(substrings, *log)) {
+      matching_logs->push_front(*log);
+    }
+  }
+}
+
+}  // namespace mozilla