Change logging to easylogging++

This replaces the epee and data_loggers logging systems with
a single one, and also adds filename:line and explicit severity
levels. Categories may be defined, and logging severity set
by category (or set of categories). epee style 0-4 log level
maps to a sensible severity configuration. Log files now also
rotate when reaching 100 MB.

To select which logs to output, use the MONERO_LOGS environment
variable, with a comma separated list of categories (globs are
supported), with their requested severity level after a colon.
If a log matches more than one such setting, the last one in
the configuration string applies. A few examples:

This one is (mostly) silent, only outputting fatal errors:

MONERO_LOGS=*:FATAL

This one is very verbose:

MONERO_LOGS=*:TRACE

This one is totally silent (logwise):

MONERO_LOGS=""

This one outputs all errors and warnings, except for the
"verify" category, which prints just fatal errors (the verify
category is used for logs about incoming transactions and
blocks, and it is expected that some/many will fail to verify,
hence we don't want the spam):

MONERO_LOGS=*:WARNING,verify:FATAL

Log levels are, in decreasing order of priority:
FATAL, ERROR, WARNING, INFO, DEBUG, TRACE

Subcategories may be added using prefixes and globs. This
example will output net.p2p logs at the TRACE level, but all
other net* logs only at INFO:

MONERO_LOGS=*:ERROR,net*:INFO,net.p2p:TRACE

Logs which are intended for the user (which Monero was using
a lot through epee, but really isn't a nice way to go things)
should use the "global" category. There are a few helper macros
for using this category, eg: MGINFO("this shows up by default")
or MGINFO_RED("this is red"), to try to keep a similar look
and feel for now.

Existing epee log macros still exist, and map to the new log
levels, but since they're used as a "user facing" UI element
as much as a logging system, they often don't map well to log
severities (ie, a log level 0 log may be an error, or may be
something we want the user to see, such as an important info).
In those cases, I tried to use the new macros. In other cases,
I left the existing macros in. When modifying logs, it is
probably best to switch to the new macros with explicit levels.

The --log-level options and set_log commands now also accept
category settings, in addition to the epee style log levels.

src/common/dns_utils.cpp

@@ -41,6 +41,9 @@
 using namespace epee;
 namespace bf = boost::filesystem;
 
+#undef MONERO_DEFAULT_LOG_CATEGORY
+#define MONERO_DEFAULT_LOG_CATEGORY "net.dns"
+
 static boost::mutex instance_lock;
 
 namespace

src/common/i18n.cpp

@@ -36,6 +36,9 @@
 #include "common/util.h"
 #include "common/i18n.h"
 
+#undef MONERO_DEFAULT_LOG_CATEGORY
+#define MONERO_DEFAULT_LOG_CATEGORY "i18n"
+
 static const unsigned char qm_magic[16] = {0x3c, 0xb8, 0x64, 0x18, 0xca, 0xef, 0x9c, 0x95, 0xcd, 0x21, 0x1c, 0xbf, 0x60, 0xa1, 0xbd, 0xdd};
 
 static std::map<std::string,std::string> i18n_entries;

src/common/perf_timer.cpp

@@ -28,18 +28,22 @@
 
 #include "perf_timer.h"
 
+#undef MONERO_DEFAULT_LOG_CATEGORY
+#define MONERO_DEFAULT_LOG_CATEGORY "perf"
+
 namespace tools
 {
 
-int performance_timer_log_level = 2;
+el::Level performance_timer_log_level = el::Level::Debug;
 __thread std::vector<PerformanceTimer*> *performance_timers = NULL;
 
-void set_performance_timer_log_level(int level)
+void set_performance_timer_log_level(el::Level level)
 {
-  if (level < LOG_LEVEL_MIN || level > LOG_LEVEL_MAX)
+  if (level != el::Level::Debug && level != el::Level::Trace && level != el::Level::Info
+   && level != el::Level::Warning && level != el::Level::Error && level != el::Level::Fatal)
   {
-    LOG_PRINT_L0("Wrong log level: " << level << ", using 2");
-    level = 2;
+    MERROR("Wrong log level: " << el::LevelHelper::convertToString(level) << ", using Debug");
+    level = el::Level::Debug;
   }
   performance_timer_log_level = level;
 }

src/common/perf_timer.h

@@ -32,23 +32,26 @@
 #include <stdio.h>
 #include "misc_log_ex.h"
 
+#undef MONERO_DEFAULT_LOG_CATEGORY
+#define MONERO_DEFAULT_LOG_CATEGORY "perf"
+
 namespace tools
 {
 
 class PerformanceTimer;
 
-extern int performance_timer_log_level;
+extern el::Level performance_timer_log_level;
 extern __thread std::vector<PerformanceTimer*> *performance_timers;
 
 class PerformanceTimer
 {
 public:
-  PerformanceTimer(const std::string &s, int l = LOG_LEVEL_2): name(s), level(l), started(false)
+  PerformanceTimer(const std::string &s, el::Level l = el::Level::Debug): name(s), level(l), started(false)
   {
     ticks = epee::misc_utils::get_tick_count();
     if (!performance_timers)
     {
-      LOG_PRINT("PERF             ----------", level);
+      MLOG(level, "PERF             ----------");
       performance_timers = new std::vector<PerformanceTimer*>();
     }
     else
@@ -56,7 +59,7 @@ public:
       PerformanceTimer *pt = performance_timers->back();
       if (!pt->started)
       {
-        LOG_PRINT("PERF           " << std::string((performance_timers->size()-1) * 2, ' ') << "  " << pt->name, pt->level);
+        MLOG(pt->level, "PERF           " << std::string((performance_timers->size()-1) * 2, ' ') << "  " << pt->name);
         pt->started = true;
       }
     }
@@ -69,7 +72,7 @@ public:
     ticks = epee::misc_utils::get_tick_count() - ticks;
     char s[12];
     snprintf(s, sizeof(s), "%8llu  ", (unsigned long long)ticks);
-    LOG_PRINT("PERF " << s << std::string(performance_timers->size() * 2, ' ') << "  " << name, level);
+    MLOG(level, "PERF " << s << std::string(performance_timers->size() * 2, ' ') << "  " << name);
     if (performance_timers->empty())
     {
       delete performance_timers;
@@ -79,12 +82,12 @@ public:
 
 private:
   std::string name;
-  int level;
+  el::Level level;
   uint64_t ticks;
   bool started;
 };
 
-void set_performance_timer_log_level(int level);
+void set_performance_timer_log_level(el::Level level);
 
 #define PERF_TIMER(name) tools::PerformanceTimer pt_##name(#name, tools::performance_timer_log_level)
 #define PERF_TIMER_L(name, l) tools::PerformanceTimer pt_##name(#name, l)

src/common/scoped_message_writer.h

@@ -34,20 +34,23 @@
 namespace tools
 {
 
+/************************************************************************/
+/*                                                                      */
+/************************************************************************/
 class scoped_message_writer
 {
 private:
   bool m_flush;
   std::stringstream m_oss;
-  epee::log_space::console_colors m_color;
+  epee::console_colors m_color;
   bool m_bright;
-  int m_log_level;
+  el::Level m_log_level;
 public:
   scoped_message_writer(
-      epee::log_space::console_colors color = epee::log_space::console_color_default
+      epee::console_colors color = epee::console_color_default
     , bool bright = false
     , std::string&& prefix = std::string()
-    , int log_level = LOG_LEVEL_2
+    , el::Level log_level = el::Level::Info
     )
     : m_flush(true)
     , m_color(color)
@@ -88,17 +91,17 @@ public:
     {
       m_flush = false;
 
-      LOG_PRINT(m_oss.str(), m_log_level);
+      MCLOG(m_log_level, "msgwriter", m_oss.str());
 
-      if (epee::log_space::console_color_default == m_color)
+      if (epee::console_color_default == m_color)
       {
         std::cout << m_oss.str();
       }
       else
       {
-        epee::log_space::set_console_color(m_color, m_bright);
+        set_console_color(m_color, m_bright);
         std::cout << m_oss.str();
-        epee::log_space::reset_console_color();
+        epee::reset_console_color();
       }
       std::cout << std::endl;
     }
@@ -107,17 +110,17 @@ public:
 
 inline scoped_message_writer success_msg_writer()
 {
-  return scoped_message_writer(epee::log_space::console_color_green, false, std::string(), LOG_LEVEL_2);
+  return scoped_message_writer(epee::console_color_green, false, std::string(), el::Level::Info);
 }
 
-inline scoped_message_writer msg_writer(epee::log_space::console_colors color = epee::log_space::console_color_default)
+inline scoped_message_writer msg_writer(epee::console_colors color = epee::console_color_default)
 {
-  return scoped_message_writer(color, false, std::string(), LOG_LEVEL_2);
+  return scoped_message_writer(color, false, std::string(), el::Level::Info);
 }
 
 inline scoped_message_writer fail_msg_writer()
 {
-  return scoped_message_writer(epee::log_space::console_color_red, true, "Error: ", LOG_LEVEL_0);
+  return scoped_message_writer(epee::console_color_red, true, "Error: ", el::Level::Error);
 }
 
 } // namespace tools

src/common/stack_trace.cpp

@@ -35,6 +35,11 @@
 #include <dlfcn.h>
 #endif
 
+#undef MONERO_DEFAULT_LOG_CATEGORY
+#define MONERO_DEFAULT_LOG_CATEGORY "stacktrace"
+
+#define ST_LOG(x) CERROR(el::base::Writer,el::base::DispatchAction::FileOnlyLog,MONERO_DEFAULT_LOG_CATEGORY) << x
+
 // from http://stackoverflow.com/questions/11665829/how-can-i-print-stack-trace-for-caught-exceptions-in-c-code-injection-in-c
 
 // The decl of __cxa_throw in /usr/include/.../cxxabi.h uses
@@ -103,34 +108,34 @@ void log_stack_trace(const char *msg)
   const char *log = stack_trace_log.empty() ? NULL : stack_trace_log.c_str();
 
   if (msg)
-    LOG_PRINT2(log, msg, LOG_LEVEL_0);
-  LOG_PRINT2(log, "Unwound call stack:", LOG_LEVEL_0);
+    ST_LOG(msg);
+  ST_LOG("Unwound call stack:");
   if (unw_getcontext(&ctx) < 0) {
-    LOG_PRINT2(log, "Failed to create unwind context", LOG_LEVEL_0);
+    ST_LOG("Failed to create unwind context");
     return;
   }
   if (unw_init_local(&cur, &ctx) < 0) {
-    LOG_PRINT2(log, "Failed to find the first unwind frame", LOG_LEVEL_0);
+    ST_LOG("Failed to find the first unwind frame");
     return;
   }
   for (level = 1; level < 999; ++level) { // 999 for safety
     int ret = unw_step(&cur);
     if (ret < 0) {
-      LOG_PRINT2(log, "Failed to find the next frame", LOG_LEVEL_0);
+      ST_LOG("Failed to find the next frame");
       return;
     }
     if (ret == 0)
       break;
     if (unw_get_reg(&cur, UNW_REG_IP, &ip) < 0) {
-      LOG_PRINT2(log, "  " << std::setw(4) << level, LOG_LEVEL_0);
+      ST_LOG("  " << std::setw(4) << level);
       continue;
     }
     if (unw_get_proc_name(&cur, sym, sizeof(sym), &off) < 0) {
-      LOG_PRINT2(log, "  " << std::setw(4) << level << std::setbase(16) << std::setw(20) << "0x" << ip, LOG_LEVEL_0);
+      ST_LOG("  " << std::setw(4) << level << std::setbase(16) << std::setw(20) << "0x" << ip);
       continue;
     }
     dsym = abi::__cxa_demangle(sym, NULL, NULL, &status);
-    LOG_PRINT2(log, "  " << std::setw(4) << level << std::setbase(16) << std::setw(20) << "0x" << ip << " " << (!status && dsym ? dsym : sym) << " + " << "0x" << off, LOG_LEVEL_0);
+    ST_LOG("  " << std::setw(4) << level << std::setbase(16) << std::setw(20) << "0x" << ip << " " << (!status && dsym ? dsym : sym) << " + " << "0x" << off);
     free(dsym);
   }
 }

src/common/util.h

@@ -152,7 +152,7 @@ namespace tools
       }
       else
       {
-        LOG_PRINT_RED_L0("Got control signal " << type << ". Exiting without saving...");
+        MGINFO_RED("Got control signal " << type << ". Exiting without saving...");
         return FALSE;
       }
       return TRUE;