Merge pull request #2345 from keep-network/lp-token-tracker

KEEP calculation in LP pairs (keep-eth & keep-tbtc) staked in LP reward contracts

In this PR we calculate amount of KEEP which makes a LP pair token: [KEEP-ETH](https://info.uniswap.org/pair/0xe6f19dab7d43317344282f803f8e8d240708174a) & [KEEP-TBTC](https://info.uniswap.org/pair/0x38c8ffee49f286f25d25bad919ff7552e5daf081).  These LP tokens are staked by stakers in two contracts: [LPRewardsKEEPETH](https://etherscan.io/address/0x47a5f2ffdf66d13ed7e317581f458d09b49d6f44) and [LPRewardsKEEPTBTC](https://etherscan.io/address/0xb3d03a5411261fc2094697c5e969d552ee55cf6b).

KEEP calculation in LP pairs will become a part of a truth source in KEEP token tracker. KEEP staker balances will be stored in two files:
- `./tmp/keep-in-lp-keepeth-token-balances.json`
- `./tmp/keep-in-lp-keeptbtc-token-balances.json`

Calculation of each asset that makes a LP pair can be calculated using the formula below. For example consider KEEP-ETH pair:
`KEEP_staker_owed = (LP_staker_balance * KEEP_total_liquidity_pool) / LP_total_supply_pool` 
Refer to [calculation description](https://github.com/keep-network/keep-core/blob/lp-token-tracker/token-tracker/src/truth-sources/lp-tokens.js#L203) for more context.

We discussed LP asset calculation also in [this](#2302 (comment)) comment.

token-tracker/README.adoc

@@ -44,6 +44,13 @@ addresses that are contracts handled by the other sources.
 
 Scans `TokenGrant` contract for grant holders and their balances.
 
+### Liquidity Rewards
+
+Scans for `Staked` events in the KEEP-ETH and KEEP-TBTC LP Rewards contracts. It
+finds all the stakers addresses and their LP balances locked in these contracts 
+at the provided target block. KEEP locked amount is calculated for each staker 
+based on their LP tokens balances.
+
 ### KEEP-only pool
 
 Scans for `Staked` events in the `KeepVault` contract. It retrieves all the stakers 

token-tracker/artifacts/KEEP-ETH-UNI-V2-Token.json

@@ -0,0 +1,5 @@
+{
+  "status": "1",
+  "message": "OK-Missing/Invalid API Key, rate limit of 1/5sec applied",
+  "result": 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+}

token-tracker/artifacts/KEEP-TBTC-UNI-V2-Token.json

@@ -0,0 +1,5 @@
+{
+  "status": "1",
+  "message": "OK-Missing/Invalid API Key, rate limit of 1/5sec applied",
+  "result": 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+}