1 files changed, 128 insertions, 0 deletions
diff --git a/src/log/Log.h b/src/log/Log.h
new file mode 100644
index 000000000..5eeed4101
--- /dev/null
+++ b/src/log/Log.h
@@ -0,0 +1,128 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef __CEPH_LOG_LOG_H
+#define __CEPH_LOG_LOG_H
+
+#include <boost/circular_buffer.hpp>
+
+#include <condition_variable>
+#include <memory>
+#include <mutex>
+#include <queue>
+#include <string>
+#include <string_view>
+
+#include "common/Thread.h"
+#include "common/likely.h"
+
+#include "log/Entry.h"
+
+namespace ceph {
+namespace logging {
+
+class Graylog;
+class SubsystemMap;
+
+class Log : private Thread
+{
+  using EntryRing = boost::circular_buffer<ConcreteEntry>;
+  using EntryVector = std::vector<ConcreteEntry>;
+
+  static const std::size_t DEFAULT_MAX_NEW = 100;
+  static const std::size_t DEFAULT_MAX_RECENT = 10000;
+
+  Log **m_indirect_this;
+
+  const SubsystemMap *m_subs;
+
+  std::mutex m_queue_mutex;
+  std::mutex m_flush_mutex;
+  std::condition_variable m_cond_loggers;
+  std::condition_variable m_cond_flusher;
+
+  pthread_t m_queue_mutex_holder;
+  pthread_t m_flush_mutex_holder;
+
+  EntryVector m_new;    ///< new entries
+  EntryRing m_recent; ///< recent (less new) entries we've already written at low detail
+  EntryVector m_flush; ///< entries to be flushed (here to optimize heap allocations)
+
+  std::string m_log_file;
+  int m_fd = -1;
+  uid_t m_uid = 0;
+  gid_t m_gid = 0;
+
+  int m_fd_last_error = 0;  ///< last error we say writing to fd (if any)
+
+  int m_syslog_log = -2, m_syslog_crash = -2;
+  int m_stderr_log = -1, m_stderr_crash = -1;
+  int m_graylog_log = -3, m_graylog_crash = -3;
+
+  std::string m_log_stderr_prefix;
+
+  std::shared_ptr<Graylog> m_graylog;
+
+  std::vector<char> m_log_buf;
+
+  bool m_stop = false;
+
+  std::size_t m_max_new = DEFAULT_MAX_NEW;
+  std::size_t m_max_recent = DEFAULT_MAX_RECENT;
+
+  bool m_inject_segv = false;
+
+  void *entry() override;
+
+  void _log_safe_write(std::string_view sv);
+  void _flush_logbuf();
+  void _flush(EntryVector& q, bool crash);
+
+  void _log_message(std::string_view s, bool crash);
+
+public:
+  using Thread::is_started;
+
+  Log(const SubsystemMap *s);
+  ~Log() override;
+
+  void set_flush_on_exit();
+
+  void set_coarse_timestamps(bool coarse);
+  void set_max_new(std::size_t n);
+  void set_max_recent(std::size_t n);
+  void set_log_file(std::string_view fn);
+  void reopen_log_file();
+  void chown_log_file(uid_t uid, gid_t gid);
+  void set_log_stderr_prefix(std::string_view p);
+
+  void flush();
+
+  void dump_recent();
+
+  void set_syslog_level(int log, int crash);
+  void set_stderr_level(int log, int crash);
+  void set_graylog_level(int log, int crash);
+
+  void start_graylog();
+  void stop_graylog();
+
+  std::shared_ptr<Graylog> graylog() { return m_graylog; }
+
+  void submit_entry(Entry&& e);
+
+  void start();
+  void stop();
+
+  /// true if the log lock is held by our thread
+  bool is_inside_log_lock();
+
+  /// induce a segv on the next log event
+  void inject_segv();
+  void reset_segv();
+};
+
+}
+}
+
+#endif