Tranche staking strategy (snapshot-labs#154)

* Added package-lock.json

* Added the tranche-staking strategy

* Updated author and reverted changes in package-lock.json

src/strategies/index.ts

@@ -68,6 +68,7 @@ import { strategy as mushrooms } from './mushrooms';
 import { strategy as curioCardsErc20Weighted } from './curio-cards-erc20-weighted';
 import { strategy as renNodes } from './ren-nodes';
 import { strategy as multisigOwners } from './multisig-owners';
+import { strategy as trancheStaking } from './tranche-staking';
 import { strategy as pepemon } from './pepemon';
 import { strategy as erc1155AllBalancesOf } from './erc1155-all-balances-of';
 
@@ -142,6 +143,7 @@ export default {
   'curio-cards-erc20-weighted': curioCardsErc20Weighted,
   'ren-nodes': renNodes,
   'multisig-owners': multisigOwners,
+  'tranche-staking': trancheStaking,
   pepemon,
   'erc1155-all-balances-of': erc1155AllBalancesOf
 };

src/strategies/tranche-staking/examples.json

@@ -0,0 +1,21 @@
+[
+  {
+    "name": "Example query",
+    "strategy": {
+      "name": "tranche-staking",
+      "params": {
+        "address": "0x5ce49f584257606426498bfd16d770c50bb20254",
+        "tokenAddress": "0x0AeE8703D34DD9aE107386d3eFF22AE75Dd616D1",
+        "symbol": "SLICE",
+        "decimals": 18,
+        "start": 12113995
+      }
+    },
+    "network": "1",
+    "addresses": [
+      "0xd2ddb0e1c223a873c77ee80497e9d82c1002e483",
+      "0xbfdc3fe26553ac0c6041c1e6e0081f95b8c824b3"
+    ],
+    "snapshot": 12114000
+  }
+]

src/strategies/tranche-staking/index.ts

@@ -0,0 +1,58 @@
+import { formatUnits } from '@ethersproject/units';
+import { multicall } from '../../utils';
+
+export const author = 'ayush-jibrel';
+export const version = '0.1.0';
+
+const abi = [
+  {
+    constant: true,
+    inputs: [
+      {
+        internalType: 'address',
+        name: 'user',
+        type: 'address'
+      },
+      {
+        internalType: 'address',
+        name: 'token',
+        type: 'address'
+      }
+    ],
+    name: 'balanceOf',
+    outputs: [
+      {
+        internalType: 'uint256',
+        name: '',
+        type: 'uint256'
+      }
+    ],
+    payable: false,
+    stateMutability: 'view',
+    type: 'function'
+  }
+];
+
+export async function strategy(
+  space,
+  network,
+  provider,
+  addresses,
+  options,
+  snapshot
+) {
+  const blockTag = typeof snapshot === 'number' ? snapshot : 'latest';
+  const response = await multicall(
+    network,
+    provider,
+    abi,
+    addresses.map((address: any) => [options.address, 'balanceOf', [address, options.tokenAddress]]),
+    { blockTag }
+  );
+  return Object.fromEntries(
+    response.map((value, i) => [
+      addresses[i],
+      parseFloat(formatUnits(value.toString(), options.decimals))
+    ])
+  );
+}