Hello,
I’m beginning to wrap my head around flask’s app.app_context(), which I think I might need in the following mwe. What I’m trying to do is to make some files which are provided by the parameter “user_assets_paths” available via @app.route. To achieve this I am using the exec() command, because i need a different function name for each route, otherwise I will get an error saying I am trying to overwrite an existing function.
Inside of the exec()-function, if i don’t import send_from_directory(), i’m getting the NameError. If it’s not imported, I’m getting the RuntimeError.
I’m looking forward to your suggestions on how to achieve what I’m trying to do.
mwe.py:
import dash
import dash_core_components as dcc
import dash_html_components as html
from dash.dependencies import Input, State, Output
from pathlib import Path
app = dash.Dash()
app.layout = html.Div(["hello world"])
user_assets_paths = ["."]
def getfile_path_name_extension(directories_or_files: list):
"""
:param list[str] directories_or_files: A list of directory- or filepaths. Directories will not be searched for files recursively
:returns list[tuple] filesplits: file-information splitted into tuples with filepath, filename and fileextension
"""
directories_or_files = [
Path(path).absolute() for path in directories_or_files
]
filepaths = set()
for path in directories_or_files:
if path.is_file():
filepaths.add(path)
else:
for filepath in [
path / entry
for entry in path.glob("*")
if (path / entry).is_file()
]:
filepaths.add(filepath)
filesplits = []
for filepath in filepaths:
fileextension = "".join(suffix for suffix in filepath.suffixes)
filename = filepath.stem
filepath = filepath.parent
filesplits.append((filepath, filename, fileextension))
print(filesplits)
return filesplits
def exec_get_file(iteration):
func = {}
exec(
f"""def get_file{iteration}(filepath, filename, fileextension):
filename = f"{filename}{fileextension}"
print(filepath, filename, fileextension)
try:
from flask import send_from_directory
return send_from_directory(filepath, filename)
except FileNotFoundError:
abort(404)""",
func,
)
print(func[f"get_file{iteration}"])
return func[f"get_file{iteration}"]
for iteration, (filepath, filename, fileextension) in enumerate(
getfile_path_name_extension(user_assets_paths)
):
app.server.route(
f"/user_assets/{fileextension.replace('.', '')}/{filename}"
)(exec_get_file(iteration)(filepath, filename, fileextension))
if __name__ == "__main__":
app.run_server(debug=True)