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.

2 files changed, 24 insertions, 17 deletions

diff --git a/src/blockchain_db/blockchain_db.cpp b/src/blockchain_db/blockchain_db.cpp
index 7eb81d933..a88af2fc9 100644
--- a/src/blockchain_db/blockchain_db.cpp
+++ b/src/blockchain_db/blockchain_db.cpp
@@ -32,6 +32,9 @@
 #include "cryptonote_core/cryptonote_format_utils.h"
 #include "profile_tools.h"
 
+#undef MONERO_DEFAULT_LOG_CATEGORY
+#define MONERO_DEFAULT_LOG_CATEGORY "blockchain.db"
+
 using epee::string_tools::pod_to_hex;
 
 namespace cryptonote
diff --git a/src/blockchain_db/lmdb/db_lmdb.cpp b/src/blockchain_db/lmdb/db_lmdb.cpp
index ca79ab4f8..343fd1fa4 100644
--- a/src/blockchain_db/lmdb/db_lmdb.cpp
+++ b/src/blockchain_db/lmdb/db_lmdb.cpp
@@ -38,6 +38,10 @@
 #include "crypto/crypto.h"
 #include "profile_tools.h"
 
+#undef MONERO_DEFAULT_LOG_CATEGORY
+#define MONERO_DEFAULT_LOG_CATEGORY "blockchain.db.lmdb"
+
+
 #if defined(__i386) || defined(__x86_64)
 #define MISALIGNED_OK	1
 #endif
@@ -388,14 +392,14 @@ void BlockchainLMDB::do_resize(uint64_t increase_size)
     boost::filesystem::space_info si = boost::filesystem::space(path);
     if(si.available < add_size)
     {
-      LOG_PRINT_RED_L0("!! WARNING: Insufficient free space to extend database !!: " << si.available / 1LL << 20L);
+      MERROR("!! WARNING: Insufficient free space to extend database !!: " << si.available / 1LL << 20L);
       return;
     }
   }
   catch(...)
   {
     // print something but proceed.
-    LOG_PRINT_YELLOW("Unable to query free disk space.", LOG_LEVEL_0);
+    MWARNING("Unable to query free disk space.");
   }
 
   MDB_envinfo mei;
@@ -437,7 +441,7 @@ void BlockchainLMDB::do_resize(uint64_t increase_size)
   if (result)
     throw0(DB_ERROR(lmdb_error("Failed to set new mapsize: ", result).c_str()));
 
-  LOG_PRINT_GREEN("LMDB Mapsize increased." << "  Old: " << mei.me_mapsize / (1024 * 1024) << "MiB" << ", New: " << new_mapsize / (1024 * 1024) << "MiB", LOG_LEVEL_0);
+  MINFO("LMDB Mapsize increased." << "  Old: " << mei.me_mapsize / (1024 * 1024) << "MiB" << ", New: " << new_mapsize / (1024 * 1024) << "MiB");
 
   mdb_txn_safe::allow_new_txns();
 }
@@ -1168,7 +1172,7 @@ void BlockchainLMDB::open(const std::string& filename, const int mdb_flags)
   {
     if (*(const uint32_t*)v.mv_data > VERSION)
     {
-      LOG_PRINT_RED_L0("Existing lmdb database was made by a later version. We don't know how it will change yet.");
+      MINFO("Existing lmdb database was made by a later version. We don't know how it will change yet.");
       compatible = false;
     }
 #if VERSION > 0
@@ -1198,8 +1202,8 @@ void BlockchainLMDB::open(const std::string& filename, const int mdb_flags)
     txn.abort();
     mdb_env_close(m_env);
     m_open = false;
-    LOG_PRINT_RED_L0("Existing lmdb database is incompatible with this version.");
-    LOG_PRINT_RED_L0("Please delete the existing database and resync.");
+    MFATAL("Existing lmdb database is incompatible with this version.");
+    MFATAL("Please delete the existing database and resync.");
     return;
   }
 
@@ -1216,7 +1220,7 @@ void BlockchainLMDB::open(const std::string& filename, const int mdb_flags)
         txn.abort();
         mdb_env_close(m_env);
         m_open = false;
-        LOG_PRINT_RED_L0("Failed to write version to database.");
+        MERROR("Failed to write version to database.");
         return;
       }
     }
@@ -2864,7 +2868,7 @@ void BlockchainLMDB::fixup()
     ptr = (char *)k.mv_data; \
     ptr[sizeof(name)-2] = 's'
 
-#define LOGIF(y)    if (y <= epee::log_space::log_singletone::get_log_detalisation_level())
+#define LOGIF(y)    if (ELPP->vRegistry()->allowed(y, MONERO_DEFAULT_LOG_CATEGORY))
 
 void BlockchainLMDB::migrate_0_1()
 {
@@ -2875,8 +2879,8 @@ void BlockchainLMDB::migrate_0_1()
   MDB_val k, v;
   char *ptr;
 
-  LOG_PRINT_YELLOW("Migrating blockchain from DB version 0 to 1 - this may take a while:", LOG_LEVEL_0);
-  LOG_PRINT_L0("updating blocks, hf_versions, outputs, txs, and spent_keys tables...");
+  MLOG_YELLOW(el::Level::Info, "Migrating blockchain from DB version 0 to 1 - this may take a while:");
+  MINFO("updating blocks, hf_versions, outputs, txs, and spent_keys tables...");
 
   do {
     result = mdb_txn_begin(m_env, NULL, 0, txn);
@@ -2887,10 +2891,10 @@ void BlockchainLMDB::migrate_0_1()
     if ((result = mdb_stat(txn, m_blocks, &db_stats)))
       throw0(DB_ERROR(lmdb_error("Failed to query m_blocks: ", result).c_str()));
     m_height = db_stats.ms_entries;
-    LOG_PRINT_L0("Total number of blocks: " << m_height);
-    LOG_PRINT_L1("block migration will update block_heights, block_info, and hf_versions...");
+    MINFO("Total number of blocks: " << m_height);
+    MINFO("block migration will update block_heights, block_info, and hf_versions...");
 
-    LOG_PRINT_L1("migrating block_heights:");
+    MINFO("migrating block_heights:");
     MDB_dbi o_heights;
 
     unsigned int flags;
@@ -2925,7 +2929,7 @@ void BlockchainLMDB::migrate_0_1()
     while(1) {
       if (!(i % 2000)) {
         if (i) {
-          LOGIF(1) {
+          LOGIF(el::Level::Info) {
             std::cout << i << " / " << z << "  \r" << std::flush;
           }
           txn.commit();
@@ -3016,7 +3020,7 @@ void BlockchainLMDB::migrate_0_1()
       MDB_val k, v;
       if (!(i % 2000)) {
         if (i) {
-          LOGIF(1) {
+          LOGIF(el::Level::Info) {
             std::cout << i << " / " << z << "  \r" << std::flush;
           }
           txn.commit();
@@ -3148,7 +3152,7 @@ void BlockchainLMDB::migrate_0_1()
     while(1) {
       if (!(i % 2000)) {
         if (i) {
-          LOGIF(1) {
+          LOGIF(el::Level::Info) {
             std::cout << i << " / " << z << "  \r" << std::flush;
           }
           txn.commit();
@@ -3294,7 +3298,7 @@ void BlockchainLMDB::migrate_0_1()
     while(1) {
       if (!(i % 1000)) {
         if (i) {
-          LOGIF(1) {
+          LOGIF(el::Level::Info) {
             std::cout << i << " / " << z << "  \r" << std::flush;
           }
           MDB_val_set(pk, "txblk");