1 files changed, 166 insertions, 0 deletions
diff --git a/src/logging.h b/src/logging.h
new file mode 100644
index 0000000000..1f2be6016a
--- /dev/null
+++ b/src/logging.h
@@ -0,0 +1,166 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2018 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_LOGGING_H
+#define BITCOIN_LOGGING_H
+
+#include <fs.h>
+#include <tinyformat.h>
+
+#include <atomic>
+#include <cstdint>
+#include <list>
+#include <mutex>
+#include <string>
+#include <vector>
+
+static const bool DEFAULT_LOGTIMEMICROS = false;
+static const bool DEFAULT_LOGIPS        = false;
+static const bool DEFAULT_LOGTIMESTAMPS = true;
+extern const char * const DEFAULT_DEBUGLOGFILE;
+
+extern bool fLogIPs;
+
+struct CLogCategoryActive
+{
+    std::string category;
+    bool active;
+};
+
+namespace BCLog {
+    enum LogFlags : uint32_t {
+        NONE        = 0,
+        NET         = (1 <<  0),
+        TOR         = (1 <<  1),
+        MEMPOOL     = (1 <<  2),
+        HTTP        = (1 <<  3),
+        BENCH       = (1 <<  4),
+        ZMQ         = (1 <<  5),
+        DB          = (1 <<  6),
+        RPC         = (1 <<  7),
+        ESTIMATEFEE = (1 <<  8),
+        ADDRMAN     = (1 <<  9),
+        SELECTCOINS = (1 << 10),
+        REINDEX     = (1 << 11),
+        CMPCTBLOCK  = (1 << 12),
+        RAND        = (1 << 13),
+        PRUNE       = (1 << 14),
+        PROXY       = (1 << 15),
+        MEMPOOLREJ  = (1 << 16),
+        LIBEVENT    = (1 << 17),
+        COINDB      = (1 << 18),
+        QT          = (1 << 19),
+        LEVELDB     = (1 << 20),
+        ALL         = ~(uint32_t)0,
+    };
+
+    class Logger
+    {
+    private:
+        FILE* m_fileout = nullptr;
+        std::mutex m_file_mutex;
+        std::list<std::string> m_msgs_before_open;
+
+        /**
+         * m_started_new_line is a state variable that will suppress printing of
+         * the timestamp when multiple calls are made that don't end in a
+         * newline.
+         */
+        std::atomic_bool m_started_new_line{true};
+
+        /** Log categories bitfield. */
+        std::atomic<uint32_t> m_categories{0};
+
+        std::string LogTimestampStr(const std::string& str);
+
+    public:
+        bool m_print_to_console = false;
+        bool m_print_to_file = false;
+
+        bool m_log_timestamps = DEFAULT_LOGTIMESTAMPS;
+        bool m_log_time_micros = DEFAULT_LOGTIMEMICROS;
+
+        fs::path m_file_path;
+        std::atomic<bool> m_reopen_file{false};
+
+        /** Send a string to the log output */
+        int LogPrintStr(const std::string &str);
+
+        /** Returns whether logs will be written to any output */
+        bool Enabled() const { return m_print_to_console || m_print_to_file; }
+
+        bool OpenDebugLog();
+        void ShrinkDebugFile();
+
+        uint32_t GetCategoryMask() const { return m_categories.load(); }
+
+        void EnableCategory(LogFlags flag);
+        bool EnableCategory(const std::string& str);
+        void DisableCategory(LogFlags flag);
+        bool DisableCategory(const std::string& str);
+
+        bool WillLogCategory(LogFlags category) const;
+
+        bool DefaultShrinkDebugFile() const;
+    };
+
+} // namespace BCLog
+
+extern BCLog::Logger* const g_logger;
+
+/** Return true if log accepts specified category */
+static inline bool LogAcceptCategory(BCLog::LogFlags category)
+{
+    return g_logger->WillLogCategory(category);
+}
+
+/** Returns a string with the log categories. */
+std::string ListLogCategories();
+
+/** Returns a vector of the active log categories. */
+std::vector<CLogCategoryActive> ListActiveLogCategories();
+
+/** Return true if str parses as a log category and set the flag */
+bool GetLogCategory(BCLog::LogFlags& flag, const std::string& str);
+
+/** Get format string from VA_ARGS for error reporting */
+template<typename... Args> std::string FormatStringFromLogArgs(const char *fmt, const Args&... args) { return fmt; }
+
+static inline void MarkUsed() {}
+template<typename T, typename... Args> static inline void MarkUsed(const T& t, const Args&... args)
+{
+    (void)t;
+    MarkUsed(args...);
+}
+
+// Be conservative when using LogPrintf/error or other things which
+// unconditionally log to debug.log! It should not be the case that an inbound
+// peer can fill up a user's disk with debug.log entries.
+
+#ifdef USE_COVERAGE
+#define LogPrintf(...) do { MarkUsed(__VA_ARGS__); } while(0)
+#define LogPrint(category, ...) do { MarkUsed(__VA_ARGS__); } while(0)
+#else
+#define LogPrintf(...) do { \
+    if (g_logger->Enabled()) { \
+        std::string _log_msg_; /* Unlikely name to avoid shadowing variables */ \
+        try { \
+            _log_msg_ = tfm::format(__VA_ARGS__); \
+        } catch (tinyformat::format_error &fmterr) { \
+            /* Original format string will have newline so don't add one here */ \
+            _log_msg_ = "Error \"" + std::string(fmterr.what()) + "\" while formatting log message: " + FormatStringFromLogArgs(__VA_ARGS__); \
+        } \
+        g_logger->LogPrintStr(_log_msg_); \
+    } \
+} while(0)
+
+#define LogPrint(category, ...) do { \
+    if (LogAcceptCategory((category))) { \
+        LogPrintf(__VA_ARGS__); \
+    } \
+} while(0)
+#endif
+
+#endif // BITCOIN_LOGGING_H