[tracking] AIP#61 - AdEx v5: significantly cheaper channels

[elpiel]

Tracking issue for the changes regarding AIP#61: AdEx v5: significantly cheaper channels (full details here)

• Adapter
  • Calculate total spendable amount AIP #61 AdEx v5: Adapter - total spendable amount #339 (PR: V5 adapter #353)
• Channel & Campaign AIP #61 v5: Channel and Campaign #341
• NewState & Accounting
• Sentry
  • Accounting & spenders
  • GET /channel/:id/spender/:addr
  • GET /channel/:id/spender/all
  • POST /channel/:id/spender/:addr
  • POST /channel/:id/pay (Channel Payout with authentication of the spender)
    Withdrawals of advertiser funds - re-introduces the PAY event with a separate route
  • GET /channel/:id/get-leaf
    from AIP#61:

    add another helper route /get-leaf that is called like this: /get-leaf?spender=... or /get-leaf?earner=...; this will get the latest approved state (NewState/ApproveState pair), will find the given spender/earner in the balances tree, and produce a merkle proof for it; this is useful for the Platform to verify if a spender leaf really exists

  • POST /campaign/:id/close (newBudget = totalSpent, i.e. newBudget = oldBudget - remaining)
  • POST / PUT /campaign (create / modify)

    • also update spender available funds when they try to mutate campaigns

  • Enforce limits
  • Events
    • enforce per-campaign spending limits atomically

    • update the spenderLeaf directly in the DB when we receive an authenticated ApproveState/NewState

  • Distribute fees
  • Analytics breakdowns by 1hr
• Validator
  • worker will group the ticks (i.e. Accounting, NewState/ApproveState) per channel
  • Unified precision AIP #61 AdEx v5: Unified precision (8) #342
    • Targeting rules DSL - use UnifiedNum instead of BigNum (part of AIP #61 AdEx v5: Unified precision (8) #342)
  • Double-check per-spender limits
  • Remove Fees (and move to Sentry)
  • Worker flow AIP #61 v5: Validator Worker workflow #360
  • Outpace - spender & earner limits
• remove old routes and remove V5 suffixes from var names (eg analyticsRouterV5 -> analyticsRouter); do not remove the /v5 prefix from the routes themselves