Add button to download task logs as a text file

[aarochuk]

Added ability to download task instance logs in airflow 3 ui as described in issue #47689
closes: #47689

[tirkarthi]

This looks the filename for the downloaded log file. This should include dagId and taskInstance details in the name like Airflow 2 else this might keep overwriting the file on disk or create something like taskInstanceLogs(1).txt

[bbovenzi]

+1 on ${dagId}-${taskId}-${runId}-${mapIndex}-${tryNumber}.txt

[tirkarthi]

I guess you can pass text/plain in the accept here and get the raw value of the log file in the storage which is the value users usually want to reduce the code for formatting.

accept?: "application/json" | "text/plain" | "*/*";

airflow/airflow-core/src/airflow/api_fastapi/core_api/routes/public/log.py

Lines 136 to 153 in 96c6daa

	if accept == Mimetype.JSON or accept == Mimetype.ANY: # default
	logs, metadata = task_log_reader.read_log_chunks(ti, try_number, metadata)
	encoded_token = None
	if not metadata.get("end_of_log", False):
	encoded_token = URLSafeSerializer(request.app.state.secret_key).dumps(metadata)
	return TaskInstancesLogResponse.model_construct(continuation_token=encoded_token, content=logs)
	# text/plain, or something else we don't understand. Return raw log content
	# We need to exhaust the iterator before we can generate the continuation token.
	# We could improve this by making it a streaming/async response, and by then setting the header using
	# HTTP Trailers
	logs = "".join(task_log_reader.read_log_stream(ti, try_number, metadata))
	headers = None
	if not metadata.get("end_of_log", False):
	headers = {
	"Airflow-Continuation-Token": URLSafeSerializer(request.app.state.secret_key).dumps(metadata)
	}
	return Response(media_type="application/x-ndjson", content=logs, headers=headers)

[bbovenzi]

@aarochuk mind rebasing and addressing PR comments?

[aarochuk]

@bbovenzi I will make sure to make another push by the end of the week sorry it has taken so long

[github-actions]

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[bbovenzi]

@aarochuk are you still able to finish this PR?