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Summary

@st.cache_resource is recommended to use for non-hashable resources like database connections. However, such resources might require closing.

Why?

@st.cache_resource is recommended to use for non-hashable resources like database connection. From the doc:

 @st.cache_resource
 def get_database_session(_sessionmaker, url):
     # Create a database connection object that points to the URL.
     return connection

However, these resources could require closing (closing the database connection, stopping a SparkSession).

In the current implementation I'm not able to close the connection, requiring the streamlit instance to be restarted. For database connections this will result in dangling connections.

How?

Ideally I'd be able to close the resource in the same function similar to PyTest yields usage:

 @st.cache_resource
 def get_database_session(_sessionmaker, url):
     # Create a database connection object that points to the URL.
     yield connection
     connection.close()

Alternatively, perhaps a close callback:

 @st.cache_resource(close= lambda con: con.close())
 def get_database_session(_sessionmaker, url):
     # Create a database connection object that points to the URL.
     return connection

Additional Context

No response