cmd, eth: orchestrator activated/deactivated watcher

[kyriediculous]

What does this pull request do? Explain your changes. (required)
This PR adds an implementation for an OrchestratorWatcher that watches for on-chain emitted TranscoderActivated and TranscoderDeactivated events and updates orchestrators stored in the database accordingly.

Specific updates (required)

• Added TranscoderActivated and TranscoderDeactivated to eth/watchers/topics.go
• Added an OrchestratorStore interface to eth/watchers/types to be able to stub out common.DB for easier unit testing
• Added an OrchestratorWatcher type
• Start an OrchestratorWatcher in livepeer.go
• Add a StubOrchestratorStore and helpers for creating stubbed out TranscoderActivated/TranscoderDeactivated events to eth/watchers/stub.go
• Added ActivationRound and DeactivationRound fields to types.Transcoder
• Make sure LivepeerEthClient.GetTranscoder() now also returns ActivationRound and DeactivationRound

How did you test each of these updates (required)
Ran unit tests

Does this pull request close any open issues?
Fixes #1150

Checklist:

• README and other documentation updated
• Node runs in OSX and devenv
• All tests in ./test.sh pass

[yondonfu]

Changed the target branch to nv/db-orchestrator-updates since this PR builds on top of that branch to make it easier to review the commits specific to this PR.

[kyriediculous]

2ebd7fc fixes TranscoderDeactivated test for removed logs (stubClient.Orch was missing an Address field) and use NewDBOrch() instead of literal.

[kyriediculous]

9d860c1 properly sets an O's deactivationRound to the maximum possible value for an int64 upon a TranscoderActivated event (similar to how we set it to 2^256-1 in BondingManager), when a TranscoderActivated event is removed now also setting the deactivationRound retrieved from the RPC call on O.

Otherwise deactivationRound would be 0, but currentRound < deactivationRound would always return false, and thus an O would always be inactive.

[yondonfu]

Changes look good - let's rebase

[kyriediculous]

rebased !

…

On Wed, Nov 13, 2019 at 9:07 PM Yondon Fu ***@***.***> wrote: ***@***.**** commented on this pull request. Changes look good - let's rebase — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#1173?email_source=notifications&email_token=AFJZZWXVWF3KZ2WB4GMXB3TQTRM63A5CNFSM4JJWLVUKYY3PNVWWK3TUL52HS4DFWFIHK3DMKJSXC5LFON2FEZLWNFSXPKTDN5WW2ZLOORPWSZGOCLO36TY#pullrequestreview-316522319>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AFJZZWWRI5FJWHJVVJFLLOTQTRM63ANCNFSM4JJWLVUA> .

[yondonfu]

dc7b318 looks like a duplicate commit (already in #1171). Can we drop it?

[kyriediculous]

done !

[yondonfu]

LGTM 🚢