Enhancement: New BlockTracker and Json-Rpc-Engine based Provider

[kumavis]

• move to away from provider engine
  • configure network via json-rpc-engine
  • remove provider._blockTracker and provider.on('block') usage
  • remove provider-engine dep
  • remove docs mentioning provider-engine dep
• move to eth-block-tracker@4
  • update block event handlers
    • eth-json-rpc-filters
    • recent-block controller
    • balance controller
    • tx controller
    • nonce-tracker
    • others??
    • fix missing block on block body requests
  • update eth-block-tracker dep to use semver

bonus:

• add subs support
• dont subscribe to blocks unless necessary
• dedupe repeated code in controllers/network/createXyzClient
• publish createBlockTrackerInspectorMiddleware
• nonce-tracker _getCurrentBlock -> await getLatestBlock()

[metamaskbot]

Builds ready [7918240]: mascara, chrome, firefox, edge, opera

[bdresser]

Couple weeks back we grouped a bunch of issues that were possibly going to be addressed by this PR. @frankiebee @kumavis would you mark off what's handled and I'll leave the rest open?

• Network: disable cache on localhost Network: disable cache on localhost #3088
• Reduce load on infura Reduce load on infura #3143
• Filters/Events/Logs not working correctly Filters/Events/Logs not working correctly #2978
• will not start! stuck on "connecting to network" Stuck on "connecting to network" #2636
• Detect when TestRPC changes & restart provider Detect when TestRPC changes & restart provider #2373
• Add websocket support Add websocket support #1645
• Pass origin HTTP header on requests to Infura Pass origin HTTP header on requests to Infura #4739

[danfinlay]

Let's begin the process of trying this out on develop!

[kumavis]

@bdresser thanks for that list! some of them may be complete but are not QA'd

[saturnial]

Hi there! When can we expect this fix to be available to the public?

We're currently experiencing issues where our calls to read data from the blockchain are hitting the cache -- preventing us from seeing updated data when transactions are newly mined.

We believe this to be caused by the caching policy embedded in MetaMask but would love to confirm this...

Thanks!

[danfinlay]

We're hoping to start rolling this branch out this week, but it depends on the number of bugs our team finds (we have it on develop branch now).

[tarekskr]

Hey @danfinlay , has this been rolled out yet? Any ETA? Thanks a lot!

[bdresser]

@tarekskr still testing on develop, will likely roll out early next week!

[tarekskr]

@bdresser this is really awesome, can't wait!!