[tor-bugs] #27647 [Core Tor/Tor]: When randomly choosing IPv4 or IPv6, set IPv6 probability based on IPv6 weight

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#27647: When randomly choosing IPv4 or IPv6, set IPv6 probability based on IPv6
weight
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 Reporter:  teor             |          Owner:  neel
     Type:  defect           |         Status:  assigned
 Priority:  Medium           |      Milestone:  Tor: unspecified
Component:  Core Tor/Tor     |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:  tor-client ipv6  |  Actual Points:
Parent ID:  #17835           |         Points:
 Reviewer:                   |        Sponsor:
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Comment (by teor):

 When the consensus is received, tor parses it, and assigns bandwidth
 weights to each relay. Each relay has an IPv4 address, and an optional
 IPv6 address. Some relays can be entry nodes, depending on their flags.

 When bridges are configured, tor parses the config, and weights each
 bridge equally. Each bridge has one or two IP addresses. Each bridge is an
 entry node.

 Once the entry nodes have up-to-date weights and addresses, you can
 calculate the entry node weight for IPv4 and IPv6.

 We'll also need some documentation for this weight calculation, probably
 in dir-spec.txt.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27647#comment:4>
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