Add XFR middleware and:
- Fixes a bug where the incorrect owner name was passed to the zone walker callback.
- New `ixfr-client.rs` example.
- Updated `serve-zone.rs` example demonstrating TSIG authenticated XFR and NOTIFY middlewares.
- Additional From impls for CallResult.
- Renames ZoneDiff to InMemoryZoneDiff.
- Renames ZoneDiffBuilder to InMemoryZoneDiffBuilder.
- Introduces new ZoneDiff and related traits.
- Adds AnswerContent::first().
This PR adds zonefile/parsed.rs, zonetree/ and related examples/, which
together enable, and show a library user how, to go from a zone file in
presentation format to an in-memory tree of zones which can be queried to
provide an answer, or walked (iterated over).
The tree also supports versioned write operations and a trait based zone
implementation allowing for the in-memory tree for a zone to instead be some
other (a)synchornous backing store (as demonstrated by the mysql-zone.rs
example).
The zonetree module is feature-gated behind the unstable-zonetree feature.
This PR fixes scanning (i.e., reading from presentation format) of domain
names that are just the root label. It also fixes how they are displayed:
previously they were empty, now they are displayed as a dot. It also adds a
new method Dname::fmt_with_dot that returns a placeholder type that displays
the name with a dot at the end.
This commit completely redesigns zone file parsing. The primary change is to
convert the scanner into a trait in order to allow multiple zone parser
implementations for different sources and purposes. A number of changes had
to be made in order to make this possible.
The commit also contains an initial implementation of a scanner that modifies
data in-place and can thus returned parsed data with only a minimal amount
of additional allocations. While working, this scanner is more a
proof-of-concept at this point to ensure that the API design is sound.
This commit is based on ideas and code proposed by @not-my-profile in #106.
This commit increases the minimal supported Rust version to 1.59.0.
