ensure that setting loglevel on one logger doesn't change others

invokeai/backend/util/logging.py

@@ -342,8 +342,7 @@ class InvokeAILogger(object):  # noqa D102
         cls, name: str = "InvokeAI", config: InvokeAIAppConfig = InvokeAIAppConfig.get_config()
     ) -> logging.Logger:  # noqa D102
         if name in cls.loggers:
-            logger = cls.loggers[name]
-            logger.handlers.clear()
+            return cls.loggers[name]
         else:
             logger = logging.getLogger(name)
         logger.setLevel(config.log_level.upper())  # yes, strings work here
@@ -358,7 +357,7 @@ class InvokeAILogger(object):  # noqa D102
         handlers = []
         for handler in handler_strs:
             handler_name, *args = handler.split("=", 2)
-            args = args[0] if len(args) > 0 else None
+            arg = args[0] if len(args) > 0 else None
 
             # console and file get the fancy formatter.
             # syslog gets a simple one
@@ -370,16 +369,16 @@ class InvokeAILogger(object):  # noqa D102
                 handlers.append(ch)
 
             elif handler_name == "syslog":
-                ch = cls._parse_syslog_args(args)
+                ch = cls._parse_syslog_args(arg)
                 handlers.append(ch)
 
             elif handler_name == "file":
-                ch = cls._parse_file_args(args)
+                ch = cls._parse_file_args(arg)
                 ch.setFormatter(formatter())
                 handlers.append(ch)
 
             elif handler_name == "http":
-                ch = cls._parse_http_args(args)
+                ch = cls._parse_http_args(arg)
                 handlers.append(ch)
         return handlers
 

tests/backend/util/test_logging.py

@@ -0,0 +1,57 @@
+"""
+Test interaction of logging with configuration system.
+"""
+import io
+import logging
+import re
+
+from invokeai.app.services.config import InvokeAIAppConfig
+from invokeai.backend.util.logging import InvokeAILogger, LOG_FORMATTERS
+
+
+# test formatting
+# Would prefer to use the capfd/capsys fixture here, but it is broken
+# when used with the logging module: https://github.com/pytest-dev/pytest/issue
+def test_formatting():
+    logger = InvokeAILogger.get_logger()
+    stream = io.StringIO()
+    handler = logging.StreamHandler(stream)
+    handler.setFormatter(LOG_FORMATTERS["plain"]())
+    logger.addHandler(handler)
+    logger.info("test1")
+    output = stream.getvalue()
+    assert re.search(r"\[InvokeAI\]::INFO --> test1$", output)
+
+    handler.setFormatter(LOG_FORMATTERS["legacy"]())
+    logger.info("test2")
+    output = stream.getvalue()
+    assert re.search(r">> test2$", output)
+
+
+# test independence of two loggers with different names
+def test_independence():
+    logger1 = InvokeAILogger.get_logger()
+    logger2 = InvokeAILogger.get_logger("Test")
+    assert logger1.name == "InvokeAI"
+    assert logger2.name == "Test"
+    assert logger1.level == logging.INFO
+    assert logger2.level == logging.INFO
+    logger2.setLevel(logging.DEBUG)
+    assert logger1.level == logging.INFO
+    assert logger2.level == logging.DEBUG
+
+
+# test that the logger is returned from two similar get_logger() calls
+def test_retrieval():
+    logger1 = InvokeAILogger.get_logger()
+    logger2 = InvokeAILogger.get_logger()
+    logger3 = InvokeAILogger.get_logger("Test")
+    assert logger1 == logger2
+    assert logger1 != logger3
+
+
+# test that the configuration is used to set the initial logging level
+def test_config():
+    config = InvokeAIAppConfig(log_level="debug")
+    logger1 = InvokeAILogger.get_logger("DebugTest", config=config)
+    assert logger1.level == logging.DEBUG