Generalize network_event_log -> device_event_log

This CL:
* Moves network_event_log.cc -> device_event_log_impl.cc
* Defines macros and initialization code in device_event_log.h
* Modifies network_event_log.h to use device_event_log instead.
* Converts PowerManagerClient logging to use POWER_LOG as an immediately useful example.
* Adds the non-network log entries to a 'device_log' entry in chrome://system and feedback reports.

BUG=293739

Review URL: https://codereview.chromium.org/773703002

Cr-Commit-Position: refs/heads/master@{#307086}

1 files changed, 83 insertions, 0 deletions

diff --git a/chromeos/device_event_log_impl.h b/chromeos/device_event_log_impl.h
new file mode 100644
index 0000000..f053571
--- /dev/null
+++ b/chromeos/device_event_log_impl.h
@@ -0,0 +1,83 @@
+// Copyright 2014 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.
+
+#ifndef CHROMEOS_DEVICE_EVENT_LOG_IMPL_H_
+#define CHROMEOS_DEVICE_EVENT_LOG_IMPL_H_
+
+#include <list>
+#include <string>
+
+#include "base/time/time.h"
+#include "chromeos/chromeos_export.h"
+#include "chromeos/device_event_log.h"
+
+namespace chromeos {
+
+namespace device_event_log {
+
+class CHROMEOS_EXPORT DeviceEventLogImpl {
+ public:
+  struct LogEntry {
+    LogEntry(const char* filedesc,
+             int file_line,
+             LogType log_type,
+             LogLevel log_level,
+             const std::string& event);
+
+    std::string file;
+    int file_line;
+    LogType log_type;
+    LogLevel log_level;
+    std::string event;
+    base::Time time;
+    int count;
+  };
+
+  explicit DeviceEventLogImpl(size_t max_entries);
+  ~DeviceEventLogImpl();
+
+  // Implements device_event_log::AddEntry.
+  void AddEntry(const char* file,
+                int file_line,
+                LogType type,
+                LogLevel level,
+                const std::string& event);
+
+  // Implements device_event_log::GetAsString.
+  std::string GetAsString(StringOrder order,
+                          const std::string& format,
+                          LogType log_type,
+                          LogLevel max_level,
+                          size_t max_events);
+
+  // Called from device_event_log::AddEntry if the global instance has not been
+  // created (or has already been destroyed). Logs to LOG(ERROR) or VLOG(1).
+  static void SendToVLogOrErrorLog(const char* file,
+                                   int file_line,
+                                   LogType type,
+                                   LogLevel log_level,
+                                   const std::string& event);
+
+ private:
+  friend class DeviceEventLogTest;
+
+  typedef std::list<LogEntry> LogEntryList;
+
+  void AddLogEntry(const LogEntry& entry);
+
+  // For testing
+  size_t max_entries() const { return max_entries_; }
+  void set_max_entries_for_test(size_t entries) { max_entries_ = entries; }
+
+  size_t max_entries_;
+  LogEntryList entries_;
+
+  DISALLOW_COPY_AND_ASSIGN(DeviceEventLogImpl);
+};
+
+}  // namespace device_event_log
+
+}  // namespace chromeos
+
+#endif  // CHROMEOS_DEVICE_EVENT_LOG_IMPL_H_