2 unstable releases
0.2.0 | Aug 4, 2024 |
---|---|
0.1.0 | Jul 10, 2024 |
#84 in Database implementations
131 downloads per month
85KB
2K
SLoC
xapian-rs
xapian-rs
provides a set of low-level, mostly-ergonomic Rust bindings for
the Xapian search library.
The bindings are provided by a mix of auto-generation (via
autocxx
) and manual generation (via
cxx
). When necessary, small C++ shims are implemented to
work around incompatibilities between these tools and the Xapian codebase.
Status / Stability
xapian-rs
is currently immature, untested and incomplete. During the 0.x
version series, no stability guarantees are provided for the API, and it may
change or break at any time. A small, limited real-world use case has been
implemented in pantry
, which exercises
an interesting but small subset of the capabilities of Xapian:
- Indexing
- Searching
- Faceting
Some functionality is not provided at this time, including (but not limited to):
KeyMaker
- Custom RangeProcessor implementations
Design
Where possible, xapian-rs
tries to provide simple and ergonomic interactions
with idiomatic Rust code. However, Xapian is a C++ codebase which uses C++
idioms, and this does have some consequences on the current design (as do
limitations of the autocxx
and cxx
):
- Xapian primarily uses exceptions for error handling.
autocxx
does not currently support catching exceptions (thoughcxx
does). In the current version, any Xapian exception will trigger a panic in Rust code. This will improve as the library evolves. - Xapian uses C++ strings very heavily. C++ strings provide no encoding guarantees, while Rust strings are guaranteed to be valid UTF-8. These bindings currently handle this in a way that is inconsistent (though at times convenient). This will become more well-defined as the library evolves.
- Several Xapian types are exposed in a way that allows implementation via Rust
traits. At present, these traits are generally implemented via
&self
references, and therefore interior mutability is often needed to implement interesting functionality. - Some of these traits intentionally leak memory when passed to FFI today. This will improve as the library evolves.
Examples
Several examples are provided in the examples
directory. The tests
directory's integration tests are also useful.
Dependencies
~2.9–7.5MB
~143K SLoC