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Implementation spec of Double Signing Risk Reduction [ADR-51](https://github.com/tendermint/tendermint/blob/master/docs/architecture/adr-051-double-signing-risk-reduction.md) by B-Harvest - Add `DoubleSignCheckHeight` config variable to ConsensusConfig for "How many blocks looks back to check existence of the node's consensus votes when before joining consensus" - Add `consensus.double_sign_check_height` to `config.toml` and `tendermint node` as flag for set `DoubleSignCheckHeight` - Set default `consensus.double_sign_check_height` to `0` ( it could be adjustable in this PR, disable when 0 ) Refs - [ADR-51](https://github.com/tendermint/tendermint/blob/master/docs/architecture/adr-051-double-signing-risk-reduction.md) - [https://github.com/tendermint/tendermint/issues/4059](https://github.com/tendermint/tendermint/issues/4059) - [https://github.com/tendermint/tendermint/pull/4262](https://github.com/tendermint/tendermint/pull/4262)
Tendermint Tests
The unit tests (ie. the go test s) can be run with make test.
The integration tests can be run with make test_integrations.
Running the integrations test will build a docker container with local version of tendermint and run the following tests in docker containers:
- go tests, with --race
- includes test coverage
- app tests
- kvstore app over socket
- counter app over socket
- counter app over grpc
- persistence tests
- crash tendermint at each of many predefined points, restart, and ensure it syncs properly with the app
- p2p tests
- start a local kvstore app testnet on a docker network (requires docker version 1.10+)
- send a tx on each node and ensure the state root is updated on all of them
- crash and restart nodes one at a time and ensure they can sync back up (via fastsync)
- crash and restart all nodes at once and ensure they can sync back up
- restart each nodes with double_sign_check_height and ensure panic if the same consensus key was used to sign in double_sign_check_height blocks