Refactor TFW logging

lib/tfw/logging.py

@@ -1,10 +1,9 @@
 # pylint: disable=bad-whitespace
-from sys import stderr
 from datetime import datetime
+from typing import TextIO, Union
+from dataclasses import dataclass
 from logging import DEBUG, getLogger, Handler, Formatter, Filter
 
-from .envvars import TFWENV
-
 
 class Color:
     GREY        = '\033[30;1m'
@@ -17,40 +16,55 @@ class Color:
     RESET       = '\033[0m'
 
 
-class TFWLog:
-    def __init__(self, path=TFWENV.LOGFILE, level=DEBUG):
-        self.log = getLogger()
-        self.old_level = self.log.level
+@dataclass
+class Log:
+    stream: Union[str, TextIO]
+    formatter: Formatter
+
+
+class Logger:
+    def __init__(self, logs, level=DEBUG):
+        self.root_logger = getLogger()
+        self.old_level = self.root_logger.level
         self.new_level = level
-        self.handler = TFWLogHandler(path)
-        self.handler.setFormatter(TFWLogFormatter(20))
+        self.handlers = []
+        for log in logs:
+            handler = LogHandler(log.stream)
+            handler.setFormatter(log.formatter)
+            self.handlers.append(handler)
 
     def start(self):
-        self.log.setLevel(self.new_level)
-        self.log.addHandler(self.handler)
+        self.root_logger.setLevel(self.new_level)
+        for handler in self.handlers:
+            self.root_logger.addHandler(handler)
 
     def stop(self):
-        self.log.setLevel(self.old_level)
-        self.handler.close()
-        self.log.removeHandler(self.handler)
+        self.root_logger.setLevel(self.old_level)
+        for handler in self.handlers:
+            handler.close()
+            self.root_logger.removeHandler(handler)
 
 
-class TFWLogHandler(Handler):
-    def __init__(self, path):
-        self.logfile = open(path, 'a+')
+class LogHandler(Handler):
+    def __init__(self, stream):
+        if isinstance(stream, str):
+            self.stream = open(stream, 'a+')
+            self.close_stream = True
+        else:
+            self.stream = stream
+            self.close_stream = False
         super().__init__()
 
     def emit(self, record):
-        short_entry, long_entry = self.format(record)
-        stderr.write(short_entry+'\n')
-        self.logfile.write(long_entry+'\n')
-        stderr.flush()
-        self.logfile.flush()
+        entry = self.format(record)
+        self.stream.write(entry+'\n')
+        self.stream.flush()
 
     def close(self):
-        self.logfile.close()
+        if self.close_stream:
+            self.stream.close()
 
-class TFWLogFormatter(Formatter):
+class LogFormatter(Formatter):
     severity_to_color = {
         'CRITICAL' : Color.BOLDRED,
         'ERROR'    : Color.RED,
@@ -69,18 +83,13 @@ class TFWLogFormatter(Formatter):
         if record.args:
             tuple_args = (record.args,) if isinstance(record.args, dict) else record.args
             clean_args = tuple((self.trim(arg) for arg in tuple_args))
-            short_message = record.msg % clean_args
-            long_message = record.msg % record.args
+            message = record.msg % clean_args
         else:
-            short_message = record.msg
-            long_message = record.msg
+            message = record.msg
 
-        short_entry = (f'[{Color.GREY}{date}{Color.RESET}|>'
+        return (f'[{Color.GREY}{date}{Color.RESET}|>'
                 f'{self.severity_to_color[record.levelname]}{record.module}:'
-                       f'{record.levelname.lower()}{Color.RESET}] {short_message}')
-        long_entry = (f'[{date}|>{record.module}:{record.levelname.lower()}] '
-                      f'{long_message}')
-        return short_entry, long_entry
+                f'{record.levelname.lower()}{Color.RESET}] {message}')
 
     def trim(self, value):
         if isinstance(value, dict):
@@ -91,6 +100,18 @@ class TFWLogFormatter(Formatter):
         return value
 
 
+class VerboseLogFormatter(Formatter):
+    def format(self, record):
+        date = datetime.utcfromtimestamp(record.created).strftime('%H:%M:%S')
+        if record.args:
+            message = record.msg % record.args
+        else:
+            message = record.msg
+
+        return (f'[{date}|>{record.module}:{record.levelname.lower()}] '
+                f'{message}')
+
+
 class WhitelistFilter(Filter):
     def __init__(self, names):
         self.names = names

supervisor/tfw_server.py

@@ -1,10 +1,16 @@
+from sys import stderr
+
 from tornado.ioloop import IOLoop
 
-from tfw.config.log import TFWLog
 from tfw.server import TFWServer
+from tfw.config import TFWENV
+from tfw.logging import Log, Logger, LogFormatter, VerboseLogFormatter
 
 
 if __name__ == '__main__':
-    TFWLog().start()
+    Logger([
+        Log(stderr, LogFormatter(20)),
+        Log(TFWENV.LOGFILE, VerboseLogFormatter())
+    ]).start()
     TFWServer().listen()
     IOLoop.instance().start()