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fix want gauge calculation

Fix PeerManager signalAvailabiity() race

fix: avoid taking accessing the peerQueues without taking the lock

fix: update circleci ci-go

Or, really, just avoid accessing it. We don't need it.

This caused a concurrent map access panic under load.

Quick alternative to #407 to fix the main issue.

If peer is first to send a block to session, protect connection

Ensure sessions register with PeerManager

* feat: total wants gauge

* fix: in gauges count wants regardless of which peers they're sent to

* fix: want block gauge calculation

* refactor: simplify peermanagerwants

Improve peer manager performance

Instead of tracking offsets, just create a "new" slice starting with the
broadcast cancel slice. Under the covers, this will just use the same memory
over and over.

fix: return wants from engine.WantlistForPeer()

chore(deps): bump github.com/libp2p/go-libp2p from 0.6.1 to 0.8.3

Bumps [github.com/libp2p/go-libp2p](https://github.com/libp2p/go-libp2p) from 0.6.1 to 0.8.3.
- [Release notes](https://github.com/libp2p/go-libp2p/releases)
- [Changelog](https://github.com/libp2p/go-libp2p/blob/master/NEWS.md)
- [Commits](https://github.com/libp2p/go-libp2p/compare/v0.6.1...v0.8.3)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

calculate message latency

chore(deps): bump github.com/ipfs/go-log from 1.0.2 to 1.0.4

* fix: use one less go-routine per session

* fix: send cancel when GetBlocks() is cancelled (#383)

* fix: send cancel when GetBlocks() is cancelled

* fix: in SessionManager shutdown nil out sessions

* fix: sessionWantSender perf

* make sessionWantSender.SignalAvailability() non-blocking

* Refactor SessionInterestManager (#384)

* refactor: customize SessionInterestManager

* refactor: SessionInterestManager perf

Bumps [github.com/ipfs/go-log](https://github.com/ipfs/go-log) from 1.0.2 to 1.0.4.
- [Release notes](https://github.com/ipfs/go-log/releases)
- [Commits](https://github.com/ipfs/go-log/compare/v1.0.2...v1.0.4)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>