def create_native_stderr_log_handler(
log_level: LogLevel,
native: Native,
stream: Optional[TextIO] = None) -> NativeHandler:
try:
native.setup_stderr_logger(log_level.level)
except Exception as e:
print(f"Error setting up pantsd logger: {e!r}", file=sys.stderr)
raise e
return NativeHandler(log_level, native, stream)
class NativeHandler(StreamHandler):
"""This class is installed as a Python logging module handler (using the logging.addHandler
method) and proxies logs to the Rust logging infrastructure."""
def __init__(
self,
log_level: LogLevel,
stream: Optional[TextIO] = None,
native_filename: Optional[str] = None,
):
if stream is not None and native_filename is not None:
raise RuntimeError("NativeHandler must output to either a stream or a file, not both")
super().__init__(stream)
self.native = Native()
self.native_filename = native_filename
self.setLevel(log_level.level)
if stream:
try:
self.native.setup_stderr_logger(log_level.level)
except Exception as e:
print(f"Error setting up pantsd logger: {e!r}", file=sys.stderr)
raise e
def emit(self, record: LogRecord) -> None:
self.native.write_log(
self.format(record), record.levelno, f"{record.name}:pid={os.getpid()}"
)
def flush(self) -> None:
self.native.flush_log()
def __repr__(self) -> str:
return (
f"NativeHandler(id={id(self)}, level={self.level}, filename={self.native_filename}, "
f"stream={self.stream})"
)
