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tendermint/abci/example/kvstore
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Phil Salant bc572217c0 Fix linter errors thrown by lll (#3970) 
* Fix long line errors in abci, crypto, and libs packages

* Fix long lines in p2p and rpc packages

* Fix long lines in abci, state, and tools packages

* Fix long lines in behaviour and blockchain packages

* Fix long lines in cmd and config packages

* Begin fixing long lines in consensus package

* Finish fixing long lines in consensus package

* Add lll exclusion for lines containing URLs

* Fix long lines in crypto package

* Fix long lines in evidence package

* Fix long lines in mempool and node packages

* Fix long lines in libs package

* Fix long lines in lite package

* Fix new long line in node package

* Fix long lines in p2p package

* Ignore gocritic warning

* Fix long lines in privval package

* Fix long lines in rpc package

* Fix long lines in scripts package

* Fix long lines in state package

* Fix long lines in tools package

* Fix long lines in types package

* Enable lll linter
2019-10-17 10:42:28 +02:00
..
helpers.go
abci: VoteInfo, ValidatorUpdate. See ADR-018
2018-08-16 13:19:13 -04:00
kvstore_test.go
Fix linter errors thrown by lll (#3970)
2019-10-17 10:42:28 +02:00
kvstore.go
tm-cmn to tm-db (#3850)
2019-07-31 11:34:17 +02:00
persistent_kvstore.go
fix linter errors thrown by unconvert, goconst, and nakedret (#3960)
2019-09-10 11:31:44 +04:00
README.md
abci/examples: switch from hex to base64 pubkey in kvstore (#3641)
2019-06-21 15:18:49 +04:00

README.md

KVStore

There are two app's here: the KVStoreApplication and the PersistentKVStoreApplication.

KVStoreApplication

The KVStoreApplication is a simple merkle key-value store. Transactions of the form key=value are stored as key-value pairs in the tree. Transactions without an = sign set the value to the key. The app has no replay protection (other than what the mempool provides).

PersistentKVStoreApplication

The PersistentKVStoreApplication wraps the KVStoreApplication and provides two additional features:

  1. persistence of state across app restarts (using Tendermint's ABCI-Handshake mechanism)
  2. validator set changes

The state is persisted in leveldb along with the last block committed, and the Handshake allows any necessary blocks to be replayed. Validator set changes are effected using the following transaction format:

"val:pubkey1!power1,pubkey2!power2,pubkey3!power3"

where pubkeyN is a base64-encoded 32-byte ed25519 key and powerN is a new voting power for the validator with pubkeyN (possibly a new one). To remove a validator from the validator set, set power to 0. There is no sybil protection against new validators joining.