fix: logging.getLogger gets properly configured logger

app/util/logging.py

@@ -0,0 +1,59 @@
+from logging import Formatter, StreamHandler
+
+
+class NamingCache:
+  def __init__(self):
+    self._cache = {}
+
+  def __getitem__(self, key):
+    if key not in self._cache:
+      self._cache[key] = self.shorten(key)
+    return self._cache[key]
+
+  @staticmethod
+  def shorten(logger_name: str) -> str:
+    target_length = 18
+    if len(logger_name) > target_length:
+      parts = logger_name.split('.')
+      part = 0
+      while len(logger_name) > target_length:
+        if part == len(parts) - 1:
+          logger_name = f'...{logger_name[-(target_length - 3):]}'
+          break
+        parts[part] = parts[part][0]
+        logger_name = '.'.join(parts)
+        part += 1
+
+    return logger_name.ljust(target_length)
+
+
+class ApplicationFormatter(Formatter):
+  def __init__(self, handler_prefix: str = ''):
+    super().__init__()
+    self._logger_names = NamingCache()
+    self._handler_prefix = handler_prefix
+
+  def format(self, record):
+    from datetime import datetime
+    timestamp = datetime.fromtimestamp(record.created).isoformat(sep=' ', timespec='milliseconds')
+    level = record.levelname.replace('WARNING', 'WARN').rjust(5)
+    thread_name = record.threadName.replace(' (', '#').replace(')', '').rjust(16)[-16:] # TODO: NamingCache?
+    logger_name = self._logger_names[f"{self._handler_prefix}{record.name}"]
+    message = record.getMessage()
+    formatted = f"{timestamp} {level} [{thread_name}] {logger_name} : {message}"
+
+    if record.exc_info:
+      formatted += "\n" + self.formatException(record.exc_info)
+
+    return formatted
+
+
+class LoggingHandler(StreamHandler):
+  def __init__(self):
+    super().__init__()
+    self.setFormatter(ApplicationFormatter(handler_prefix='karl.'))
+
+class ExternalLoggingHandler(StreamHandler):
+  def __init__(self):
+    super().__init__()
+    self.setFormatter(ApplicationFormatter())