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Modularise slasher backend (#3443)

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## Proposed Changes

Enable multiple database backends for the slasher, either MDBX (default) or LMDB. The backend can be selected using `--slasher-backend={lmdb,mdbx}`.

## Additional Info

In order to abstract over the two library's different handling of database lifetimes I've used `Box::leak` to give the `Environment` type a `'static` lifetime. This was the only way I could think of using 100% safe code to construct a self-referential struct `SlasherDB`, where the `OpenDatabases` refers to the `Environment`. I think this is OK, as the `Environment` is expected to live for the life of the program, and both database engines leave the database in a consistent state after each write. The memory claimed for memory-mapping will be freed by the OS and appropriately flushed regardless of whether the `Environment` is actually dropped.

We are depending on two `sigp` forks of `libmdbx-rs` and `lmdb-rs`, to give us greater control over MDBX OS support and LMDB's version.
This commit is contained in:
Michael Sproul
2022-08-15 01:30:56 +00:00
parent 71fd0b42f2
commit 92d597ad23
25 changed files with 905 additions and 230 deletions
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book/src/cross-compiling.md
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@@ -38,3 +38,9 @@ make build-aarch64
The `lighthouse` binary will be compiled inside a Docker container and placed
in `lighthouse/target/aarch64-unknown-linux-gnu/release`.
## Feature Flags
When using the makefile the set of features used for building can be controlled with
the environment variable `CROSS_FEATURES`. See [Feature
Flags](./installation-source.md#feature-flags) for available features.