prop224: HSDir descriptor cache implementation

This ticket is part of proposal 224 and is for the implementation of the descriptor cache on the HSDir side.

changed milestone to %Tor: 0.3.0.x-final

added TorCoreTeam201609 component::core tor/tor milestone::Tor: 0.3.0.x-final nickm-deferred-20161005 owner::dgoulet parent::17238 points::6 priority::high prop224 resolution::fixed severity::normal sponsor::R-must status::closed tor-hs type::enhancement labels

Trac:
Owner: N/A to dgoulet
Priority: Medium to High
Points: N/A to large
Status: new to accepted

I'm still not 100% done that is missing some documentations and massive amount of tests. In the meantime, here is the development branch: ticket18572_029_01

Relevant discussions about the implementation choices: https://lists.torproject.org/pipermail/tor-dev/2016-April/010781.html

Trac:
Points: large to 6

Trac:
Keywords: N/A deleted, TorCoreTeam201608 added

Review and merge will happen in September.

Trac:
Keywords: TorCoreTeam201608 deleted, TorCoreTeam201609 added

Deferring big/risky-feature things (even the ones I really love!) to 0.3.0. Please argue if I'm wrong.

Trac:
Milestone: Tor: 0.2.9.x-final to Tor: 0.3.0.x-final
Keywords: N/A deleted, nickm-deferred-20161005 added

Merged as part of #17238 (moved) in commit 02561061.

Trac:
Resolution: N/A to fixed
Status: accepted to closed

closed

changed time estimate to 48h

mentioned in issue #19205 (moved)

mentioned in issue #19642 (moved)

moved to tpo/core/tor#18572 (closed)

mentioned in issue tpo/core/tor#19205 (closed)