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tor-dirserver: Implement request function

Clara Englerrequested to merge
cve/arti:dirmirror-download into main

This commit adds two functions:

  • request_single
  • request_mutli

The first function implements downloading a tor_dirclient::Requestable from a single authority, failing in the case of a failure.

The second function wraps the previous one in a retry loop, utilizing the RetryDelay from tor-basic-utils in order to implement it in a specification compliant fashion.

Besides, the error logging of tor-dirclient is also slightly improved in order to provide better error messages for the actual change of this MR.

Next steps: Original plan was to make this merge request a bit larger by already implementing a consensus download. However, given that this also involves lots of (or at least some) changes to tor-netdoc, it is probably better to do that in a separate MR.

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