MXS-2005: Move Logger into maxutils

Moved the logger into the maxutils library as it is a generic
utility. Also moved mxs_strerror into it as it depends on it.

maxutils/maxbase/include/maxbase/error.h

@@ -0,0 +1,29 @@
+#pragma once
+/*
+ * Copyright (c) 2016 MariaDB Corporation Ab
+ *
+ * Use of this software is governed by the Business Source License included
+ * in the LICENSE.TXT file and at www.mariadb.com/bsl11.
+ *
+ * Change Date: 2022-01-01
+ *
+ * On the date above, in accordance with the Business Source License, use
+ * of this software will be governed by version 2 or later of the General
+ * Public License.
+ */
+
+#include <maxbase/cdefs.h>
+
+#include <string.h>
+
+inline const char* mxb_strerror(int error)
+{
+    // Enough for all errors
+    static thread_local char errbuf[512];
+#ifdef HAVE_GLIBC
+    return strerror_r(error, errbuf, sizeof(errbuf));
+#else
+    strerror_r(error, errbuf, sizeof(errbuf));
+    return errbuf;
+#endif
+}

maxutils/maxbase/include/maxbase/logger.hh

@@ -12,7 +12,7 @@
  * Public License.
  */
 
-#include <maxscale/ccdefs.hh>
+#include <maxbase/ccdefs.hh>
 
 #include <string>
 #include <mutex>
@@ -20,7 +20,7 @@
 
 #include <unistd.h>
 
-namespace maxscale
+namespace maxbase
 {
 
 // Minimal logger interface

maxutils/maxbase/src/CMakeLists.txt

@@ -1,3 +1,3 @@
-add_library(maxbase STATIC eventcount.cc stopwatch.cc stacktrace.cc)
+add_library(maxbase STATIC eventcount.cc stopwatch.cc stacktrace.cc logger.cc)
 set_target_properties(maxbase PROPERTIES VERSION "1.0.0" LINK_FLAGS -Wl,-z,defs)
 install(TARGETS maxbase DESTINATION lib)

maxutils/maxbase/src/logger.cc

@@ -11,7 +11,7 @@
  * Public License.
  */
 
-#include "internal/logger.hh"
+#include <maxbase/logger.hh>
 
 #include <syslog.h>
 #include <fcntl.h>
@@ -22,7 +22,10 @@
 #include <cstdio>
 #include <ctime>
 
-#include <maxscale/debug.h>
+#include <maxbase/error.h>
+
+// TODO: move <maxscale/debug.h> into maxbase
+#define ss_dassert(a)
 
 /**
  * Error logging for the logger itself.
@@ -44,7 +47,7 @@ int open_fd(const std::string& filename)
 
     if (fd == -1)
     {
-        LOG_ERROR("Failed to open file '%s': %d, %s\n", filename.c_str(), errno, mxs_strerror(errno));
+        LOG_ERROR("Failed to open file '%s': %d, %s\n", filename.c_str(), errno, mxb_strerror(errno));
     }
 
     return fd;
@@ -68,7 +71,7 @@ bool should_log_error()
 
 }
 
-namespace maxscale
+namespace maxbase
 {
 
 //
@@ -122,7 +125,7 @@ bool FileLogger::write(const char* msg, int len)
         {
             if (should_log_error()) // Coarse error suppression
             {
-                LOG_ERROR("Failed to write to log: %d, %s\n", errno, mxs_strerror(errno));
+                LOG_ERROR("Failed to write to log: %d, %s\n", errno, mxb_strerror(errno));
             }
 
             rval = false;
@@ -194,7 +197,7 @@ bool FileLogger::write_header()
     if (!ok)
     {
         LOG_ERROR("Error: Writing log header failed due to %d, %s\n",
-                  errno, mxs_strerror(errno));
+                  errno, mxb_strerror(errno));
     }
 
     return ok;
@@ -228,7 +231,7 @@ bool FileLogger::write_footer(const char* suffix)
     if (!ok)
     {
         LOG_ERROR("Error: Writing log footer failed due to %d, %s\n",
-                  errno, mxs_strerror(errno));
+                  errno, mxb_strerror(errno));
     }
 
     return ok;

server/core/CMakeLists.txt

@@ -22,7 +22,6 @@ add_library(maxscale-common SHARED
   listener.cc
   load_utils.cc
   log_manager.cc
-  logger.cc
   mariadb.cc
   maxscale_pcre2.cc
   misc.cc

server/core/log_manager.cc

@@ -21,17 +21,16 @@
 #include <string>
 #include <mutex>
 
+#include <maxbase/error.h>
+#include <maxbase/logger.hh>
+
 #include <maxscale/config.h>
 #include <maxscale/debug.h>
 #include <maxscale/json_api.h>
 #include <maxscale/session.h>
 #include <maxscale/utils.h>
 
-#include "internal/logger.hh"
-
-using namespace maxscale;
-
-static std::unique_ptr<Logger> logger;
+static std::unique_ptr<mxb::Logger> logger;
 
 const std::string LOGFILE_NAME = "maxscale.log";
 
@@ -329,11 +328,11 @@ bool mxs_log_init(const char* ident, const char* logdir, mxs_log_target_t target
     {
         case MXS_LOG_TARGET_FS:
         case MXS_LOG_TARGET_DEFAULT:
-            logger = FileLogger::create(filename);
+            logger = mxb::FileLogger::create(filename);
             break;
 
         case MXS_LOG_TARGET_STDOUT:
-            logger = StdoutLogger::create(filename);
+            logger = mxb::StdoutLogger::create(filename);
             break;
 
         default:
@@ -864,13 +863,7 @@ int mxs_log_message(int priority,
 
 const char* mxs_strerror(int error)
 {
-    static thread_local char errbuf[MXS_STRERROR_BUFLEN];
-#ifdef HAVE_GLIBC
-    return strerror_r(error, errbuf, sizeof(errbuf));
-#else
-    strerror_r(error, errbuf, sizeof(errbuf));
-    return errbuf;
-#endif
+    return mxb_strerror(error);
 }
 
 json_t* get_log_priorities()