config: Add logfile feature

mylib/config.py

@@ -24,7 +24,9 @@ log = logging.getLogger(__name__)
 # Constants
 DEFAULT_ENCODING = "utf-8"
 DEFAULT_CONFIG_DIRPATH = os.path.expanduser("./")
-DEFAULT_CONSOLE_LOG_FORMAT = "%(asctime)s - %(module)s:%(lineno)d - %(levelname)s - %(message)s"
+DEFAULT_LOG_FORMAT = "%(asctime)s - %(module)s:%(lineno)d - %(levelname)s - %(message)s"
+DEFAULT_CONSOLE_LOG_FORMAT = DEFAULT_LOG_FORMAT
+DEFAULT_FILELOG_FORMAT = DEFAULT_LOG_FORMAT
 
 
 class ConfigException(BaseException):
@@ -824,8 +826,8 @@ class Config:  # pylint: disable=too-many-instance-attributes
             "-v", "--verbose", action="store_true", help="Show verbose messages"
         )
 
-        section = self.add_section("console", comment="Console logging")
-        section.add_option(
+        console_section = self.add_section("console", comment="Console logging")
+        console_section.add_option(
             BooleanOption,
             "enabled",
             default=False,
@@ -833,14 +835,14 @@ class Config:  # pylint: disable=too-many-instance-attributes
             short_arg="-C",
             comment="Enable/disable console log",
         )
-        section.add_option(
+        console_section.add_option(
             BooleanOption,
             "force_stderr",
             default=False,
             arg="--console-stderr",
             comment="Force console log on stderr",
         )
-        section.add_option(
+        console_section.add_option(
             StringOption,
             "log_format",
             default=DEFAULT_CONSOLE_LOG_FORMAT,
@@ -848,6 +850,24 @@ class Config:  # pylint: disable=too-many-instance-attributes
             comment="Console log format",
         )
 
+        logfile_section = self.add_section("logfile", comment="Logging file")
+        logfile_section.add_option(StringOption, "path", comment="File log path")
+        logfile_section.add_option(
+            StringOption,
+            "format",
+            default=DEFAULT_FILELOG_FORMAT,
+            comment="File log format",
+        )
+        logfile_section.add_option(
+            StringOption,
+            "level",
+            comment=(
+                "File log level limit : by default, all logged messages (according to main log "
+                "level) will be logged to the log file, but you can set a minimal level if you "
+                f"want. Possible values: {', '.join(logging.getLevelNamesMapping())}."
+            ),
+        )
+
         self.add_options_to_parser(self.options_parser)
 
         return self.options_parser
@@ -945,6 +965,24 @@ class Config:  # pylint: disable=too-many-instance-attributes
             logging.getLogger().addHandler(stdout_console_handler)
             logging.getLogger().addHandler(stderr_console_handler)
 
+        if self.get("logfile", "path"):
+            logfile_handler = logging.FileHandler(self.get("logfile", "path"))
+            logfile_level = (
+                logging.getLevelNamesMapping().get(self.get("logfile", "level"))
+                if self.get("logfile", "level")
+                else logging.DEBUG
+            )
+            if logfile_level is None:
+                log.fatal("Invalid log file level specified (%s)", self.get("logfile", "level"))
+                sys.exit(1)
+            logfile_handler.setLevel(logfile_level)
+
+            if self.get("logfile", "format"):
+                logfile_formater = logging.Formatter(self.get("logfile", "format"))
+                logfile_handler.setFormatter(logfile_formater)
+
+            logging.getLogger().addHandler(logfile_handler)
+
         if execute_callback:
             self._loaded()