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* fix: ensure broadcast when peer becomes unavailable and all other peers sent DONT_HAVE for CID

* fix: lint warnings

* refactor: simplify session want sender DONT_HAVE list

* fix: flaky test

* test: add session exhausted wants test

* docs: improve sessionWantSender processAvailability docs

Prune peers that send too many consecutive DONT_HAVEs

feat: debounce wants manually

This:

* Makes it easy to send immediately if we wait too long and/or if we have enough
to send.
* Is significantly more efficient than the debounce library as it doesn't spin
off a bunch of "after" timers.

fixes #245

chore(dep): update

chore(deps): bump github.com/ipfs/go-cid from 0.0.4 to 0.0.5

Bumps [github.com/ipfs/go-cid](https://github.com/ipfs/go-cid) from 0.0.4 to 0.0.5.
- [Release notes](https://github.com/ipfs/go-cid/releases)
- [Commits](https://github.com/ipfs/go-cid/compare/v0.0.4...v0.0.5)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Fix bug with signaling peer availability to sessions

chore(deps): bump github.com/ipfs/go-cid from 0.0.3 to 0.0.4

feat: move internals to an internal package

This makes reading the docs much easier as it's clear what's "private" and
what's not.

fixes #238

Bumps [github.com/ipfs/go-cid](https://github.com/ipfs/go-cid) from 0.0.3 to 0.0.4.
- [Release notes](https://github.com/ipfs/go-cid/releases)
- [Commits](https://github.com/ipfs/go-cid/compare/v0.0.3...v0.0.4)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

PoC of Bitswap protocol extensions implementation

This commit extends the bitswap protocol with two additional wantlist properties:

* WANT_HAVE/HAVE: Instead of asking for a block, a node can specify that they
  want to know if any peers "have" the block.
* WANT_HAVE_NOT/HAVE_NOT: Instead of waiting for a timeout, a node can explicitly
  request to be told immediately if their peers don't currently have the given
  block.

Additionally, nodes now tell their peers how much data they have queued to send
them when sending messages. This allows peers to better distribute requests,
keeping all peers busy but not overloaded.

Changes in this PR are described in: https://github.com/ipfs/go-bitswap/issues/186

fix: abort when the context is canceled while getting blocks

chore(deps): bump github.com/multiformats/go-multiaddr from 0.1.2 to 0.2.0

Bumps [github.com/multiformats/go-multiaddr](https://github.com/multiformats/go-multiaddr) from 0.1.2 to 0.2.0.
- [Release notes](https://github.com/multiformats/go-multiaddr/releases)
- [Commits](https://github.com/multiformats/go-multiaddr/compare/v0.1.2...v0.2.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

chore(deps): bump github.com/ipfs/go-datastore from 0.1.1 to 0.3.1

Bumps [github.com/ipfs/go-datastore](https://github.com/ipfs/go-datastore) from 0.1.1 to 0.3.1.
- [Release notes](https://github.com/ipfs/go-datastore/releases)
- [Commits](https://github.com/ipfs/go-datastore/compare/v0.1.1...v0.3.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

chore(deps): bump github.com/libp2p/go-libp2p-testing from 0.1.0 to 0.1.1

Bumps [github.com/libp2p/go-libp2p-testing](https://github.com/libp2p/go-libp2p-testing) from 0.1.0 to 0.1.1.
- [Release notes](https://github.com/libp2p/go-libp2p-testing/releases)
- [Commits](https://github.com/libp2p/go-libp2p-testing/compare/v0.1.0...v0.1.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

fix: wait until we finish connecting before we cancel the context

This is an interesting bug because changes to the DHT have suddenly started
triggering it. I'm not sure _why_ we weren't hitting it before now.

We may have been ignoring a context somewhere?

* feat: parallelize reads

* feat: concurent engine task workers and concurrent bstore reads

* fix: lint

* fix: address review comments

* refactor: in BlockstoreManager wait for process.Closing() instead of Context.Done()

* fix: use channel size 0 for BlockstoreManager reads

* fix: change blockstore error logs from warnings to errors

* fix: flaky test

* fix: lint

chore(deps): bump github.com/gogo/protobuf from 1.3.0 to 1.3.1