[Opendnssec-develop] adapter design

[Matthijs Mekking]

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Hi,

On the 26th, we will have another teleconf. One of the topics will be
how to implement the other adapters. These are my initial thoughts:

* Drop the zonefetcher, make adapters part of the zone list.
  It has an advantage that it becomes more flexible: you can set the
  acl per zone. It has the risk that the same information has to be
  copied many times.

* When there is a Zone Transfer adapter (AXFR, IXFR), start of a thread
  that handles incoming notifies and transfer requests (replaces the
  zone fetcher). The thread has access to the zone structures, so we
  can easily implement soa refresh, retry and expire. A thread removes
  the issues with privilege dropping and process communication.

* What to do with ods-signer sign <zone> when the zone as a AXFR/IXFR
  adapter? (Force transfer request?, read the last transferred zone?)

Attached are the proposed differences to the syntax. Most changes are
adapted from the zonefetch.rnc


Best regards,

Matthijs

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