92d597ad23
## 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.
40 lines
1.2 KiB
Rust
40 lines
1.2 KiB
Rust
#![cfg(any(feature = "mdbx", feature = "lmdb"))]
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use logging::test_logger;
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use slasher::{test_utils::indexed_att, Config, Slasher};
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use tempfile::tempdir;
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use types::Epoch;
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#[test]
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fn attestation_pruning_empty_wrap_around() {
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let tempdir = tempdir().unwrap();
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let mut config = Config::new(tempdir.path().into());
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config.validator_chunk_size = 1;
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config.chunk_size = 16;
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config.history_length = 16;
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let slasher = Slasher::open(config.clone(), test_logger()).unwrap();
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let v = vec![0];
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let history_length = config.history_length as u64;
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let mut current_epoch = Epoch::new(history_length - 1);
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slasher.accept_attestation(indexed_att(v.clone(), 0, history_length - 1, 0));
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slasher.process_queued(current_epoch).unwrap();
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slasher.prune_database(current_epoch).unwrap();
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// Delete the previous attestation
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current_epoch = Epoch::new(2 * history_length + 2);
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slasher.prune_database(current_epoch).unwrap();
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// Add an attestation that would be surrounded with the modulo considered
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slasher.accept_attestation(indexed_att(
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v,
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2 * history_length - 3,
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2 * history_length - 2,
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1,
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));
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slasher.process_queued(current_epoch).unwrap();
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}
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