Merge branch 'v1.x' of https://github.com/gabime/spdlog into std-format

README.md

@@ -373,6 +373,24 @@ $ export SPDLOG_LEVEL=info,mylogger=trace
 $ ./example
 ```
 
+
+---
+#### Log file open/close event handlers
+```c++
+// You can get subscribe to get callbacks from spdlog before/after log file has been opened or closed. 
+// This is useful for cleanup procedures or for adding someting the start/end of the log files.
+void file_events_example()
+{
+    // pass the spdlog::file_event_handlers to file sinks for open/close log file notifications
+    spdlog::file_event_handlers handlers;
+    handlers.before_open = [](spdlog::filename_t filename) { spdlog::info("Before opening {}", filename); };
+    handlers.after_open = [](spdlog::filename_t filename, std::FILE *fstream) { fputs("After opening\n", fstream); };
+    handlers.before_close = [](spdlog::filename_t filename, std::FILE *fstream) { fputs("Before closing\n", fstream); };
+    handlers.after_close = [](spdlog::filename_t filename) { spdlog::info("After closing {}", filename); };
+    auto my_logger = spdlog::basic_logger_st("some_logger", "logs/events-sample.txt", true, handlers);        
+}
+```
+
 ---
 ## Benchmarks
 

example/example.cpp

@@ -22,6 +22,7 @@ void err_handler_example();
 void syslog_example();
 void udp_example();
 void custom_flags_example();
+void file_events_example();
 
 #include "spdlog/spdlog.h"
 #include "spdlog/cfg/env.h"  // support for loading levels from the environment variable
@@ -78,6 +79,7 @@ int main(int, char *[])
         stopwatch_example();
         udp_example();
         custom_flags_example();
+        file_events_example();
 
         // Flush all *registered* loggers using a worker thread every 3 seconds.
         // note: registered loggers *must* be thread safe for this to work correctly!
@@ -120,22 +122,7 @@ void basic_example()
 void rotating_example()
 {
     // Create a file rotating logger with 5mb size max and 3 rotated files.
-    spdlog::file_event_handlers_t file_event_handlers;
+    auto rotating_logger = spdlog::rotating_logger_mt("some_logger_name", "logs/rotating.txt", 1048576 * 5, 3);
-        file_event_handlers.after_open = [](spdlog::filename_t filename, std::FILE* fstream)
-    {
-        fputs("OPEN!\r\n", fstream);
-        spdlog::info("basic_example() : file_event_handlers.after_open      : {}", filename.c_str());
-    };
-    file_event_handlers.before_close = [](spdlog::filename_t filename, std::FILE* fstream)
-    {
-        fputs("CLOSE!\r\n", fstream);
-        spdlog::info("basic_example() : file_event_handlers.before_close    : {}", filename.c_str());
-    };
-    file_event_handlers.after_close = [](spdlog::filename_t filename)
-    {
-        spdlog::info("basic_example() : file_event_handlers.after_close     : {}", filename.c_str());
-    };
-    auto rotating_logger = spdlog::rotating_logger_mt("some_logger_name", "logs/rotating.txt", 1048576 * 5, 3, false, file_event_handlers);
 }
 
 #include "spdlog/sinks/daily_file_sink.h"
@@ -317,5 +304,25 @@ void custom_flags_example()
     using spdlog::details::make_unique; // for pre c++14
     auto formatter = make_unique<spdlog::pattern_formatter>();
     formatter->add_flag<my_formatter_flag>('*').set_pattern("[%n] [%*] [%^%l%$] %v");
-    spdlog::set_formatter(std::move(formatter));
+    // set the new formatter using spdlog::set_formatter(formatter) or logger->set_formatter(formatter)
+    // spdlog::set_formatter(std::move(formatter));
+}
+
+void file_events_example()
+{
+    // pass the spdlog::file_event_handlers to file sinks for open/close log file notifications
+    spdlog::file_event_handlers handlers;
+    handlers.before_open = [](spdlog::filename_t filename) { spdlog::info("Before opening {}", filename); };
+    handlers.after_open = [](spdlog::filename_t filename, std::FILE *fstream) {
+        spdlog::info("After opening {}", filename);
+        fputs("After opening\n", fstream);
+    };
+    handlers.before_close = [](spdlog::filename_t filename, std::FILE *fstream) {
+        spdlog::info("Before closing {}", filename);
+        fputs("Before closing\n", fstream);
+    };
+    handlers.after_close = [](spdlog::filename_t filename) { spdlog::info("After closing {}", filename); };
+    auto file_sink = std::make_shared<spdlog::sinks::basic_file_sink_mt>("logs/events-sample.txt", true, handlers);
+    spdlog::logger my_logger("some_logger", file_sink);    
+    my_logger.info("Some log line");
 }

include/spdlog/common.h

@@ -302,12 +302,13 @@ struct source_loc
     const char *funcname{nullptr};
 };
 
-typedef struct 
+struct file_event_handlers
 {
+    std::function<void(const filename_t &filename)> before_open;
     std::function<void(const filename_t &filename, std::FILE *file_stream)> after_open;
     std::function<void(const filename_t &filename, std::FILE *file_stream)> before_close;
     std::function<void(const filename_t &filename)> after_close;
-} file_event_handlers_t;
+};
 
 namespace details {
 // make_unique support for pre c++14

include/spdlog/details/file_helper-inl.h

@@ -20,7 +20,7 @@
 namespace spdlog {
 namespace details {
 
-SPDLOG_INLINE file_helper::file_helper(const file_event_handlers_t& event_handlers)
+SPDLOG_INLINE file_helper::file_helper(const file_event_handlers& event_handlers)
     : event_handlers_(event_handlers)
 {}
 
@@ -37,6 +37,10 @@ SPDLOG_INLINE void file_helper::open(const filename_t &fname, bool truncate)
     auto *mode = SPDLOG_FILENAME_T("ab");
     auto *trunc_mode = SPDLOG_FILENAME_T("wb");
 
+    if (event_handlers_.before_open)
+    {
+        event_handlers_.before_open(filename_);
+    }
     for (int tries = 0; tries < open_tries_; ++tries)
     {
         // create containing folder if not exists already.

include/spdlog/details/file_helper.h

@@ -17,7 +17,7 @@ class SPDLOG_API file_helper
 {
 public:
     file_helper() = default;
-    explicit file_helper(const file_event_handlers_t& event_handlers);
+    explicit file_helper(const file_event_handlers& event_handlers);
 
     file_helper(const file_helper &) = delete;
     file_helper &operator=(const file_helper &) = delete;
@@ -51,7 +51,7 @@ private:
     const unsigned int open_interval_ = 10;
     std::FILE *fd_{nullptr};
     filename_t filename_;
-    file_event_handlers_t event_handlers_{nullptr, nullptr, nullptr};
+    file_event_handlers event_handlers_;
 };
 } // namespace details
 } // namespace spdlog

include/spdlog/sinks/basic_file_sink-inl.h

@@ -14,7 +14,7 @@ namespace spdlog {
 namespace sinks {
 
 template<typename Mutex>
-SPDLOG_INLINE basic_file_sink<Mutex>::basic_file_sink(const filename_t &filename, bool truncate, const file_event_handlers_t& event_handlers)
+SPDLOG_INLINE basic_file_sink<Mutex>::basic_file_sink(const filename_t &filename, bool truncate, const file_event_handlers& event_handlers)
     : file_helper_{event_handlers}
 {
     file_helper_.open(filename, truncate);

include/spdlog/sinks/basic_file_sink.h

@@ -20,7 +20,7 @@ template<typename Mutex>
 class basic_file_sink final : public base_sink<Mutex>
 {
 public:
-    explicit basic_file_sink(const filename_t &filename, bool truncate = false, const file_event_handlers_t& event_handlers = {nullptr, nullptr, nullptr});
+    explicit basic_file_sink(const filename_t &filename, bool truncate = false, const file_event_handlers& event_handlers = {});
     const filename_t &filename() const;
 
 protected:
@@ -40,13 +40,13 @@ using basic_file_sink_st = basic_file_sink<details::null_mutex>;
 // factory functions
 //
 template<typename Factory = spdlog::synchronous_factory>
-inline std::shared_ptr<logger> basic_logger_mt(const std::string &logger_name, const filename_t &filename, bool truncate = false, const file_event_handlers_t& event_handlers = {nullptr, nullptr, nullptr})
+inline std::shared_ptr<logger> basic_logger_mt(const std::string &logger_name, const filename_t &filename, bool truncate = false, const file_event_handlers& event_handlers = {})
 {
     return Factory::template create<sinks::basic_file_sink_mt>(logger_name, filename, truncate, event_handlers);
 }
 
 template<typename Factory = spdlog::synchronous_factory>
-inline std::shared_ptr<logger> basic_logger_st(const std::string &logger_name, const filename_t &filename, bool truncate = false, const file_event_handlers_t& event_handlers = {nullptr, nullptr, nullptr})
+inline std::shared_ptr<logger> basic_logger_st(const std::string &logger_name, const filename_t &filename, bool truncate = false, const file_event_handlers& event_handlers = {})
 {
     return Factory::template create<sinks::basic_file_sink_st>(logger_name, filename, truncate, event_handlers);
 }

include/spdlog/sinks/daily_file_sink.h

@@ -116,7 +116,7 @@ class daily_file_sink final : public base_sink<Mutex>
 {
 public:
     // create daily file sink which rotates on given time
-    daily_file_sink(filename_t base_filename, int rotation_hour, int rotation_minute, bool truncate = false, uint16_t max_files = 0, const file_event_handlers_t& event_handlers = {nullptr, nullptr, nullptr})
+    daily_file_sink(filename_t base_filename, int rotation_hour, int rotation_minute, bool truncate = false, uint16_t max_files = 0, const file_event_handlers& event_handlers = {})
         : base_filename_(std::move(base_filename))
         , rotation_h_(rotation_hour)
         , rotation_m_(rotation_minute)
@@ -263,28 +263,28 @@ using daily_file_format_sink_st = daily_file_sink<details::null_mutex, daily_fil
 //
 template<typename Factory = spdlog::synchronous_factory>
 inline std::shared_ptr<logger> daily_logger_mt(
-    const std::string &logger_name, const filename_t &filename, int hour = 0, int minute = 0, bool truncate = false, uint16_t max_files = 0, const file_event_handlers_t& event_handlers = {nullptr, nullptr, nullptr})
+    const std::string &logger_name, const filename_t &filename, int hour = 0, int minute = 0, bool truncate = false, uint16_t max_files = 0, const file_event_handlers& event_handlers = {})
 {
     return Factory::template create<sinks::daily_file_sink_mt>(logger_name, filename, hour, minute, truncate, max_files, event_handlers);
 }
 
 template<typename Factory = spdlog::synchronous_factory>
 inline std::shared_ptr<logger> daily_logger_format_mt(
-    const std::string &logger_name, const filename_t &filename, int hour = 0, int minute = 0, bool truncate = false, uint16_t max_files = 0, const file_event_handlers_t& event_handlers = {nullptr, nullptr, nullptr})
+    const std::string &logger_name, const filename_t &filename, int hour = 0, int minute = 0, bool truncate = false, uint16_t max_files = 0, const file_event_handlers& event_handlers = {})
 {
     return Factory::template create<sinks::daily_file_format_sink_mt>(logger_name, filename, hour, minute, truncate, max_files, event_handlers);
 }
 
 template<typename Factory = spdlog::synchronous_factory>
 inline std::shared_ptr<logger> daily_logger_st(
-    const std::string &logger_name, const filename_t &filename, int hour = 0, int minute = 0, bool truncate = false, uint16_t max_files = 0, const file_event_handlers_t& event_handlers = {nullptr, nullptr, nullptr})
+    const std::string &logger_name, const filename_t &filename, int hour = 0, int minute = 0, bool truncate = false, uint16_t max_files = 0, const file_event_handlers& event_handlers = {})
 {
     return Factory::template create<sinks::daily_file_sink_st>(logger_name, filename, hour, minute, truncate, max_files, event_handlers);
 }
 
 template<typename Factory = spdlog::synchronous_factory>
 inline std::shared_ptr<logger> daily_logger_format_st(
-    const std::string &logger_name, const filename_t &filename, int hour = 0, int minute = 0, bool truncate = false, uint16_t max_files = 0, const file_event_handlers_t& event_handlers = {nullptr, nullptr, nullptr})
+    const std::string &logger_name, const filename_t &filename, int hour = 0, int minute = 0, bool truncate = false, uint16_t max_files = 0, const file_event_handlers& event_handlers = {})
 {
     return Factory::template create<sinks::daily_file_format_sink_st>(logger_name, filename, hour, minute, truncate, max_files, event_handlers);
 }

include/spdlog/sinks/hourly_file_sink.h

@@ -46,7 +46,7 @@ class hourly_file_sink final : public base_sink<Mutex>
 {
 public:
     // create hourly file sink which rotates on given time
-    hourly_file_sink(filename_t base_filename, bool truncate = false, uint16_t max_files = 0, const file_event_handlers_t& event_handlers = {nullptr, nullptr, nullptr})
+    hourly_file_sink(filename_t base_filename, bool truncate = false, uint16_t max_files = 0, const file_event_handlers& event_handlers = {})
         : base_filename_(std::move(base_filename))
         , file_helper_{event_handlers}
         , truncate_(truncate)
@@ -181,14 +181,14 @@ using hourly_file_sink_st = hourly_file_sink<details::null_mutex>;
 //
 template<typename Factory = spdlog::synchronous_factory>
 inline std::shared_ptr<logger> hourly_logger_mt(
-    const std::string &logger_name, const filename_t &filename, bool truncate = false, uint16_t max_files = 0, const file_event_handlers_t& event_handlers = {nullptr, nullptr, nullptr})
+    const std::string &logger_name, const filename_t &filename, bool truncate = false, uint16_t max_files = 0, const file_event_handlers& event_handlers = {})
 {
     return Factory::template create<sinks::hourly_file_sink_mt>(logger_name, filename, truncate, max_files, event_handlers);
 }
 
 template<typename Factory = spdlog::synchronous_factory>
 inline std::shared_ptr<logger> hourly_logger_st(
-    const std::string &logger_name, const filename_t &filename, bool truncate = false, uint16_t max_files = 0, const file_event_handlers_t& event_handlers = {nullptr, nullptr, nullptr})
+    const std::string &logger_name, const filename_t &filename, bool truncate = false, uint16_t max_files = 0, const file_event_handlers& event_handlers = {})
 {
     return Factory::template create<sinks::hourly_file_sink_st>(logger_name, filename, truncate, max_files, event_handlers);
 }

include/spdlog/sinks/rotating_file_sink-inl.h

@@ -25,7 +25,7 @@ namespace sinks {
 
 template<typename Mutex>
 SPDLOG_INLINE rotating_file_sink<Mutex>::rotating_file_sink(
-    filename_t base_filename, std::size_t max_size, std::size_t max_files, bool rotate_on_open, const file_event_handlers_t& event_handlers)
+    filename_t base_filename, std::size_t max_size, std::size_t max_files, bool rotate_on_open, const file_event_handlers& event_handlers)
     : base_filename_(std::move(base_filename))
     , max_size_(max_size)
     , max_files_(max_files)

include/spdlog/sinks/rotating_file_sink.h

@@ -22,7 +22,7 @@ template<typename Mutex>
 class rotating_file_sink final : public base_sink<Mutex>
 {
 public:
-    rotating_file_sink(filename_t base_filename, std::size_t max_size, std::size_t max_files, bool rotate_on_open = false, const file_event_handlers_t& event_handlers = {nullptr, nullptr, nullptr});
+    rotating_file_sink(filename_t base_filename, std::size_t max_size, std::size_t max_files, bool rotate_on_open = false, const file_event_handlers& event_handlers = {});
     static filename_t calc_filename(const filename_t &filename, std::size_t index);
     filename_t filename();
 
@@ -60,14 +60,14 @@ using rotating_file_sink_st = rotating_file_sink<details::null_mutex>;
 
 template<typename Factory = spdlog::synchronous_factory>
 inline std::shared_ptr<logger> rotating_logger_mt(
-    const std::string &logger_name, const filename_t &filename, size_t max_file_size, size_t max_files, bool rotate_on_open = false, const file_event_handlers_t& event_handlers = {nullptr, nullptr, nullptr})
+    const std::string &logger_name, const filename_t &filename, size_t max_file_size, size_t max_files, bool rotate_on_open = false, const file_event_handlers& event_handlers = {})
 {
     return Factory::template create<sinks::rotating_file_sink_mt>(logger_name, filename, max_file_size, max_files, rotate_on_open, event_handlers);
 }
 
 template<typename Factory = spdlog::synchronous_factory>
 inline std::shared_ptr<logger> rotating_logger_st(
-    const std::string &logger_name, const filename_t &filename, size_t max_file_size, size_t max_files, bool rotate_on_open = false, const file_event_handlers_t& event_handlers = {nullptr, nullptr, nullptr})
+    const std::string &logger_name, const filename_t &filename, size_t max_file_size, size_t max_files, bool rotate_on_open = false, const file_event_handlers& event_handlers = {})
 {
     return Factory::template create<sinks::rotating_file_sink_st>(logger_name, filename, max_file_size, max_files, rotate_on_open, event_handlers);
 }