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Implement slashing protection interchange format (#1544)

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## Issue Addressed

Implements support for importing and exporting the slashing protection DB interchange format described here:

https://hackmd.io/@sproul/Bk0Y0qdGD

Also closes #1584 

## Proposed Changes

* [x] Support for serializing and deserializing the format
* [x] Support for importing and exporting Lighthouse's database
* [x] CLI commands to invoke import and export
* [x] Export to minimal format (required when a minimal format has been previously imported)
* [x] Tests for export to minimal (utilising mixed importing and attestation signing?)
* [x] Tests for import/export of complete format, and import of minimal format
* [x] ~~Prevent attestations with sources less than our max source (Danny's suggestion). Required for the fake attestation that we put in for the minimal format to block attestations from source 0.~~
* [x] Add the concept of a "low watermark" for compatibility with the minimal format

Bonus!

* [x] A fix to a potentially nasty bug involving validators getting re-registered each time the validator client ran! Thankfully, the ordering of keys meant that the validator IDs used for attestations and blocks remained stable -- otherwise we could have had some slashings on our hands! 😱
* [x] Tests to confirm that this bug is indeed vanquished
This commit is contained in:
Michael Sproul
2020-10-02 01:42:27 +00:00
parent 22aedda1be
commit 1d278aaa83
25 changed files with 1168 additions and 92 deletions
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10
validator_client/slashing_protection/src/lib.rs
View File

@@ -1,19 +1,25 @@
mod attestation_tests;
mod block_tests;
pub mod interchange;
pub mod interchange_test;
mod parallel_tests;
mod registration_tests;
mod signed_attestation;
mod signed_block;
mod slashing_database;
mod test_utils;
pub mod test_utils;
pub use crate::signed_attestation::{InvalidAttestation, SignedAttestation};
pub use crate::signed_block::{InvalidBlock, SignedBlock};
pub use crate::slashing_database::SlashingDatabase;
pub use crate::slashing_database::{SlashingDatabase, SUPPORTED_INTERCHANGE_FORMAT_VERSION};
use rusqlite::Error as SQLError;
use std::io::{Error as IOError, ErrorKind};
use std::string::ToString;
use types::{Hash256, PublicKey};
/// The filename within the `validators` directory that contains the slashing protection DB.
pub const SLASHING_PROTECTION_FILENAME: &str = "slashing_protection.sqlite";
/// The attestation or block is not safe to sign.
///
/// This could be because it's slashable, or because an error occurred.