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import abc
import logging
from typing import Optional
# setup null handler for all API endpoints
logging.getLogger("ubuntupro").addHandler(logging.NullHandler())
class AbstractProgress(metaclass=abc.ABCMeta):
@abc.abstractmethod
def progress(
self,
*,
total_steps: int,
done_steps: int,
previous_step_message: Optional[str],
current_step_message: Optional[str]
):
pass
class NullProgress(AbstractProgress):
def progress(
self,
*,
total_steps: int,
done_steps: int,
previous_step_message: Optional[str],
current_step_message: Optional[str]
):
pass
class ProgressWrapper:
def __init__(self, progress_object: Optional[AbstractProgress] = None):
if progress_object is not None:
self.progress_object = progress_object
else:
self.progress_object = NullProgress()
self.done_steps = 0
self.total_steps = -1
self.previous_step_message = None # type: Optional[str]
def progress(self, message: str):
self.progress_object.progress(
total_steps=self.total_steps,
done_steps=self.done_steps,
previous_step_message=self.previous_step_message,
current_step_message=message,
)
self.previous_step_message = message
self.done_steps += 1
def finish(self):
self.done_steps = self.total_steps
self.progress_object.progress(
total_steps=self.total_steps,
done_steps=self.done_steps,
previous_step_message=self.previous_step_message,
current_step_message=None,
)
def emit(self, event: str, payload=None):
"""
This is our secret event system. We use it internally to insert prompts
and extra messages in the middle of operations at certain points.
We don't consider this stable enough to expose to the public API.
"""
if hasattr(self.progress_object, "_on_event"):
self.progress_object._on_event(event, payload)
def is_interactive(self) -> bool:
if hasattr(self.progress_object, "is_interactive"):
return self.progress_object.is_interactive
else:
return False