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Micah Elizabeth Scott
903c6cf1ab
The goal of this patch is to add an additional mechanism for adjusting PoW effort upwards, where clients rather than services can choose to solve their puzzles at a higher effort than what was suggested in the descriptor. I wanted to use hs_cache's existing unreachability stats to drive this effort bump, but this revealed some cases where a circuit (intro or rend) closed early on can end up in hs_cache with an all zero intro point key, where nobody will find it. This moves intro_auth_pk initialization earlier in a couple places and adds nonfatal asserts to catch the problem if it shows up elsewhere. The actual effort adjustment method I chose is to multiply the suggested effort by (1 + unresponsive_count), then ensure the result is at least 1. If a service has suggested effort of 0 but we fail to connect, retries will all use an effort of 1. If the suggestion was 50, we'll try 50, 100, 150, 200, etc. This is bounded both by our client effort limit and by the limit on unresponsive_count (currently 5). Signed-off-by: Micah Elizabeth Scott <beth@torproject.org>
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