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import threading
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from typing import Callable
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import docker
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class LogStreamer:
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"""Streams Docker container logs to stdout.
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This class provides a way to stream logs from a Docker container directly to stdout
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through the provided logging function.
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"""
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def __init__(
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self,
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container: docker.models.containers.Container,
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logFn: Callable,
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):
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self.log = logFn
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self.log_generator = container.logs(stream=True, follow=True)
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self._stop_event = threading.Event()
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self.stdout_thread = threading.Thread(target=self._stream_logs)
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self.stdout_thread.daemon = True
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self.stdout_thread.start()
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def _stream_logs(self):
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"""Stream logs from the Docker container to stdout."""
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try:
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for log_line in self.log_generator:
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if self._stop_event.is_set():
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break
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if log_line:
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decoded_line = log_line.decode('utf-8').rstrip()
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self.log('debug', f'[inside container] {decoded_line}')
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except Exception as e:
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self.log('error', f'Error streaming docker logs to stdout: {e}')
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def __del__(self):
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if self.stdout_thread and self.stdout_thread.is_alive():
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self.close(timeout=5)
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def close(self, timeout: float = 5.0):
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"""Clean shutdown of the log streaming."""
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self._stop_event.set()
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if self.stdout_thread and self.stdout_thread.is_alive():
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self.stdout_thread.join(timeout)
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if hasattr(self.log_generator, 'close'):
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self.log_generator.close()
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