How can I pipe stdout from a docker container executed with execute_docker_container() into something dagster can read?

To capture stdout from a Docker container executed with

execute_docker_container()

in Dagster, you can utilize the logging facilities provided by Dagster Pipes. According to the documentation, the

PipesContext

object within the

open_dagster_pipes

context manager provides a

log

property, which is a standard Python

logging.Logger

. You can add a custom handler to this logger to capture stdout and stderr. Here's an example from the documentation on how to add a stream handler to the

PipesContext

logger to output log messages to stdout:

python import sys import logging from dagster_pipes import open_dagster_pipes  with open_dagster_pipes(...) as pipes:     handler = logging.StreamHandler(sys.stdout)     handler.setLevel(logging.DEBUG)     formatter = logging.Formatter('%(levelname)s - %(message)s')     handler.setFormatter(formatter)     pipes.log.addHandler(handler)          <http://pipes.log.info|pipes.log.info>(f"Run ID: {pipes.run_id}")

In this example, a

StreamHandler

is added to the

PipesContext

logger, which directs the log output to

sys.stdout

. This setup allows you to capture and display log messages from the external process running in the Docker container. Please note that Dagster Pipes is an experimental feature, and the APIs may change in future versions. If you need further assistance or have more specific requirements, please refer to the Dagster documentation or consider reaching out to the Dagster community for more detailed guidance.