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Port 2021 05 02

See merge request dms3/public/go-ds-badger!1

Log error if batch not committed or canceled

 Add Cancel function; add finalizer to cleanup abandoned batch

Do not implement batches using transactions

Transactions have a size limit and will only accept a finite number of writes before returning ErrTxnTooBig. Batching should not be subjected to this limit.

This PR fixes this by using a badger WriteBatch object to implement batching. The WriteBatch object packs writes into transactions, committing the transactions as they become full.

This fixes Issue #92.

Bumps [github.com/dgraph-io/badger](https://github.com/dgraph-io/badger) from 1.6.1 to 1.6.2.
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

readme: add information on Badger2 datastore

update contributing link

* Use current go-log

fix: verify that the datastore is still open when querying

fixes part of https://github.com/ipfs/go-ipfs/issues/6986

(the other part is that we should be shutting down in the right order)

build(deps): bump github.com/dgraph-io/badger from 1.6.0 to 1.6.1

Bumps [github.com/dgraph-io/badger](https://github.com/dgraph-io/badger) from 1.6.0 to 1.6.1.
- [Release notes](https://github.com/dgraph-io/badger/releases)
- [Changelog](https://github.com/dgraph-io/badger/blob/v1.6.1/CHANGELOG.md)
- [Commits](https://github.com/dgraph-io/badger/compare/v1.6.0...v1.6.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

build(deps): bump github.com/jbenet/goprocess from 0.1.3 to 0.1.4

Bumps [github.com/jbenet/goprocess](https://github.com/jbenet/goprocess) from 0.1.3 to 0.1.4.
- [Release notes](https://github.com/jbenet/goprocess/releases)
- [Commits](https://github.com/jbenet/goprocess/compare/v0.1.3...v0.1.4)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

feat: switch to file io and shrink tables

It's actually _faster_ (4x) when reading, on my system. But that may just be
because I use BTRFS + SSDs? I'm really not sure.

Bump github.com/ipfs/go-datastore from 0.4.0 to 0.4.4

Bumps [github.com/ipfs/go-datastore](https://github.com/ipfs/go-datastore) from 0.4.0 to 0.4.4.
- [Release notes](https://github.com/ipfs/go-datastore/releases)
- [Commits](https://github.com/ipfs/go-datastore/compare/v0.4.0...v0.4.4)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

fix: update go-datastore

And fix prefix handling to only find subkeys.

Bump github.com/ipfs/go-datastore from 0.3.0 to 0.3.1

Bumps [github.com/ipfs/go-datastore](https://github.com/ipfs/go-datastore) from 0.3.0 to 0.3.1.
- [Release notes](https://github.com/ipfs/go-datastore/releases)
- [Commits](https://github.com/ipfs/go-datastore/compare/v0.3.0...v0.3.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

update datastore Interface

query: always return the size

fix #75