first commit

.gitignore

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+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, build with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+.idea
+.vscode
+vendor/*

.gitpod.yml

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+# This configuration file was automatically generated by Gitpod.
+# Please adjust to your needs (see https://www.gitpod.io/docs/config-gitpod-file)
+# and commit this file to your remote git repository to share the goodness with others.
+
+image: tendermintdev/docker-tm-db-testing
+
+# this means that there's a one-click known good environment available to developers.

.golangci.yml

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+linters:
+  disable-all: true
+  enable:
+    - deadcode
+    - depguard
+    - dogsled
+    - dupl
+    - errcheck
+    - exportloopref
+    - goconst
+    - gocritic
+    - gofumpt
+    - revive
+    - gosec
+    - gosimple
+    - govet
+    - ineffassign
+    - lll
+    - misspell
+    - nakedret
+    - prealloc
+    - staticcheck
+    - stylecheck
+    - typecheck
+    - revive
+    - unconvert
+    - unused
+    - varcheck
+    - nolintlint
+
+run:
+  build-tags:
+    - cleveldb
+    - rocksdb
+    - badgerdb
+    - boltdb
+
+issues:
+  exclude-rules:
+    - path: _test\.go
+      linters:
+        - gosec
+linters-settings:
+  maligned:
+    suggest-new: true
+  errcheck:
+    # report about assignment of errors to blank identifier: `num, _ := strconv.Atoi(numStr)`;
+    # default is false: such cases aren't reported by default.
+    check-blank: true

.mergify.yml

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+queue_rules:
+  - name: default
+    conditions:
+      - base=master
+      - label=S:automerge
+
+pull_request_rules:
+  - name: automerge to master with label S:automerge and branch protection passing
+    conditions:
+      - base=master
+      - label=S:automerge
+    actions:
+      queue:
+        method: squash
+        name: default

CHANGELOG.md

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+# Changelog
+
+## Unreleased
+
+- remove mutex from prefixdb
+
+## 0.6.7
+
+**2022-2-21**
+
+- Use cosmos/rocksdb instead of techbot/rocksdb
+- Add `ForceCopmact` to goleveldb database
+
+## 0.6.6
+
+**2021-11-08**
+
+**Important note:** Version v0.6.5 was accidentally tagged and should be
+avoided.  This version is identical to v0.6.4 in package structure and API, but
+has updated the version marker so that normal `go get` upgrades will not
+require modifying existing use of v0.6.4.
+
+### Version bumps (since v0.6.4)
+
+- Bump grpc from to 1.42.0.
+- Bump dgraph/badger to v2 2.2007.3.
+- Bump go.etcd.io/bbolt to 1.3.6.
+
+## 0.6.5
+
+**2021-08-04**
+
+**Important note**: This version was tagged by accident, and should not be
+used. The tag now points to the [package-reorg
+branch](https://github.com/tendermint/tm-db/tree/package-reorg) so that
+any existing dependencies should not break.
+
+## 0.6.4
+
+**2021-02-09**
+
+Bump protobuf to 1.3.2 and grpc to 1.35.0.
+
+## 0.6.3
+
+**2020-11-10**
+
+### Improvements
+
+- [goleveldb] [\#134](https://github.com/tendermint/tm-db/pull/134) Improve iterator performance by bounding underlying iterator range (@klim0v)
+
+## 0.6.2
+
+**2020-08-27**
+
+Bump grpc, badger and goleveldb (see versions in go.mod file)
+
+## 0.6.1
+
+**2020-08-12**
+
+### Improvements
+
+- [\#115](https://github.com/tendermint/tm-db/pull/115) Add a `BadgerDB` backend with build tag `badgerdb` (@mvdan)
+
+## 0.6.0
+
+**2020-06-24**
+
+### Breaking Changes
+
+- [\#99](https://github.com/tendermint/tm-db/pull/99) Keys can no longer be `nil` or empty, and values can no longer be `nil` (@erikgrinaker)
+
+- [\#98](https://github.com/tendermint/tm-db/pull/98) `NewDB` now returns an error instead of panicing (@erikgrinaker)
+
+- [\#96](https://github.com/tendermint/tm-db/pull/96) `Batch.Set()`, `Delete()`, and `Close()` may now error (@erikgrinaker)
+
+- [\#97](https://github.com/tendermint/tm-db/pull/97) `Iterator.Close()` may now error (@erikgrinaker)
+
+- [\#97](https://github.com/tendermint/tm-db/pull/97) Many iterator panics are now exposed via `Error()` instead (@erikgrinaker)
+
+- [\#96](https://github.com/tendermint/tm-db/pull/96) The `SetDeleter` interface has been removed (@erikgrinaker)
+
+### Bug Fixes
+
+- [\#97](https://github.com/tendermint/tm-db/pull/97) `RemoteDB` iterators are now correctly primed with the first item when created, without calling `Next()` (@erikgrinaker)
+
+## 0.5.2
+
+**2020-11-10**
+
+### Improvements
+
+- [goleveldb] [\#134](https://github.com/tendermint/tm-db/pull/134) Improve iterator performance by bounding underlying iterator range (@klim0v)
+
+## 0.5.1
+
+**2020-03-30**
+
+### Bug Fixes
+
+- [boltdb] [\#81](https://github.com/tendermint/tm-db/pull/81) Use correct import path go.etcd.io/bbolt
+
+## 0.5.0
+
+**2020-03-11**
+
+### Breaking Changes
+
+- [\#71](https://github.com/tendermint/tm-db/pull/71) Closed or written batches can no longer be reused, all non-`Close()` calls will panic
+
+- [memdb] [\#74](https://github.com/tendermint/tm-db/pull/74) `Iterator()` and `ReverseIterator()` now take out database read locks for the duration of the iteration
+
+- [memdb] [\#56](https://github.com/tendermint/tm-db/pull/56) Removed some exported methods that were mainly meant for internal use: `Mutex()`, `SetNoLock()`, `SetNoLockSync()`, `DeleteNoLock()`, and `DeleteNoLockSync()`
+
+### Improvements
+
+- [memdb] [\#53](https://github.com/tendermint/tm-db/pull/53) Use a B-tree for storage, which significantly improves range scan performance
+
+- [memdb] [\#56](https://github.com/tendermint/tm-db/pull/56) Use an RWMutex for improved performance with highly concurrent read-heavy workloads
+
+### Bug Fixes
+
+- [boltdb] [\#69](https://github.com/tendermint/tm-db/pull/69) Properly handle blank keys in iterators
+
+- [cleveldb] [\#65](https://github.com/tendermint/tm-db/pull/65) Fix handling of empty keys as iterator endpoints
+
+## 0.4.1
+
+**2020-2-26**
+
+### Breaking Changes
+
+- [fsdb] [\#43](https://github.com/tendermint/tm-db/pull/43) Remove FSDB
+
+### Bug Fixes
+
+- [boltdb] [\#45](https://github.com/tendermint/tm-db/pull/45) Bring BoltDB to adhere to the db interfaces
+
+## 0.4
+
+**2020-1-7**
+
+### BREAKING CHANGES
+
+- [\#30](https://github.com/tendermint/tm-db/pull/30) Interface Breaking, Interfaces return errors instead of panic:
+  - Changes to function signatures:
+    - DB interface:
+      - `Get([]byte) ([]byte, error)`
+      - `Has(key []byte) (bool, error)`
+      - `Set([]byte, []byte) error`
+      - `SetSync([]byte, []byte) error`
+      - `Delete([]byte) error`
+      - `DeleteSync([]byte) error`
+      - `Iterator(start, end []byte) (Iterator, error)`
+      - `ReverseIterator(start, end []byte) (Iterator, error)`
+      - `Close() error`
+      - `Print() error`
+    - Batch interface:
+      - `Write() error`
+      - `WriteSync() error`
+    - Iterator interface:
+      - `Error() error`
+
+### IMPROVEMENTS
+
+- [remotedb] [\#34](https://github.com/tendermint/tm-db/pull/34) Add proto file tests and regenerate remotedb.pb.go
+
+## 0.3
+
+**2019-11-18**
+
+Special thanks to external contributors on this release:
+
+### BREAKING CHANGES
+
+- [\#26](https://github.com/tendermint/tm-db/pull/26/files) Rename `DBBackendtype` to `BackendType`
+
+## 0.2
+
+**2019-09-19**
+
+Special thanks to external contributors on this release: @stumble
+
+### Features
+
+- [\#12](https://github.com/tendermint/tm-db/pull/12) Add `RocksDB` (@stumble)
+
+## 0.1
+
+**2019-07-16**
+
+Special thanks to external contributors on this release:
+
+### Initial Release
+
+- `db`, `random.go`, `bytes.go` and `os.go` from the tendermint repo.

CONTRIBUTING.md

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+# Contributing
+
+Thank you for your interest in contributing to tm-db!
+This repository follows the [contribution guidelines] of tendermint and the corresponding [coding repo].
+Please take a look if you are not already familiar with those.
+
+[contribution guidelines]: https://github.com/tendermint/tendermint/blob/master/CONTRIBUTING.md
+[coding repo]: https://github.com/tendermint/coding