Download missing directory information and store it to disk
We'll need to have code that does more or less the following:
-
Decide which resources we are missing, and need to download -
Batch them into requests -
Make those requests via HTTP-over-begindir -
Receive the result -
Decompress the result -
Validate the result -
Store the result to disk if it is valid. -
Find a way to let the in-memory directory exist in an 'updating' state. -
Update the in-memory directory with the result.