[contract-call-view] Add contract-call-view Strategy

src/strategies/contract-call-view/README.md

@@ -0,0 +1,52 @@
+# Contract call view strategy
+
+Allows any contract function to be used to calculate voter scores, even those one which return multiple values.
+
+## Examples
+
+Can be used instead of the `contract-call` strategy, the space config will look like this:
+
+```JSON
+{
+  "strategies": [
+    ["contract-call-view", {
+      // contract address
+      "address": "0x5cA0F33f1ebD140def87721291FF313A9141F79e",
+      // decimals
+      "decimals": 18,
+      // index of value returned by function
+      "outputIndexToReturn": "1",
+      // ABI for view function
+      "methodABI": {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "name": "userInfo",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "lastStakeTime",
+          "type": "uint256"
+        },
+        {
+          "internalType": "uint256",
+          "name": "amount",
+          "type": "uint256"
+        },
+        {
+          "internalType": "uint256",
+          "name": "waitingRewards",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    }
+    }],
+  ]
+}
+```

src/strategies/contract-call-view/examples.json

@@ -0,0 +1,123 @@
+[
+  {
+    "name": "Example call to view function on staking contract",
+    "strategy": {
+      "name": "contract-call-view",
+      "params": {
+        "address": "0x5cA0F33f1ebD140def87721291FF313A9141F79e",
+        "decimals": 18,
+        "outputIndexToReturn": "1",
+        "methodABI": {
+          "inputs": [
+            {
+              "internalType": "address",
+              "name": "",
+              "type": "address"
+            }
+          ],
+          "name": "userInfo",
+          "outputs": [
+            {
+              "internalType": "uint256",
+              "name": "lastStakeTime",
+              "type": "uint256"
+            },
+            {
+              "internalType": "uint256",
+              "name": "amount",
+              "type": "uint256"
+            },
+            {
+              "internalType": "uint256",
+              "name": "waitingRewards",
+              "type": "uint256"
+            }
+          ],
+          "stateMutability": "view",
+          "type": "function"
+        }
+      }
+    },
+    "network": "42161",
+    "addresses": [
+      "0xf790b80B562EaB0c17181c637a4738a17e339255",
+      "0x0AC635d504c6795F508106f528D608d917A69022",
+      "0xc84622c0257Ec795D42407a913E6F4EbA7794550"
+    ],
+    "snapshot": 166777036
+  },
+  {
+    "name": "Example call to view function on lockup contract",
+    "strategy": {
+      "name": "contract-call-view",
+      "params": {
+        "address": "0xe8eb2675C7f44eE9395f58AeDd89f75834AB0dac",
+        "decimals": 18,
+        "outputIndexToReturn": "0",
+        "methodABI": {
+          "inputs": [
+            {
+              "internalType": "address",
+              "name": "",
+              "type": "address"
+            }
+          ],
+          "name": "stakedBalances",
+          "outputs": [
+            {
+              "internalType": "uint256",
+              "name": "",
+              "type": "uint256"
+            }
+          ],
+          "stateMutability": "view",
+          "type": "function"
+        }
+      }
+    },
+    "network": "42161",
+    "addresses": [
+      "0x7343bC5Be4ca81199EA4CBf987Bd520f83aC1fFf",
+      "0x87c5A7AAA44Db939A728cF05E31b8411A14b2579",
+      "0xa33A46408c871c0C4D172E8036DfCDCB19e6f226"
+    ],
+    "snapshot": 166777036
+  },
+  {
+    "name": "Example call to view function on vesting contract",
+    "strategy": {
+      "name": "contract-call-view",
+      "params": {
+        "address": "0xEd992b95d54Cbcc1bD416B95a4050468Ef5eb68F",
+        "decimals": 18,
+        "outputIndexToReturn": "0",
+        "methodABI": {
+          "inputs": [
+            {
+              "internalType": "address",
+              "name": "",
+              "type": "address"
+            }
+          ],
+          "name": "userTotal",
+          "outputs": [
+            {
+              "internalType": "uint256",
+              "name": "",
+              "type": "uint256"
+            }
+          ],
+          "stateMutability": "view",
+          "type": "function"
+        }
+      }
+    },
+    "network": "42161",
+    "addresses": [
+      "0xA192092036526d84D7c3BFb51a3a3a68E160EFE3",
+      "0xcC6eA51321b9525F9eB1b29011F6621A5E5633BD",
+      "0xa15d3C3A330C9a3884202Ed49d49f26ED7d9f6eC"
+    ],
+    "snapshot": 166777036
+  }
+]

src/strategies/contract-call-view/index.ts

@@ -0,0 +1,39 @@
+import { formatUnits } from '@ethersproject/units';
+import { multicall } from '../../utils';
+
+export const author = 'tkowalczyk';
+export const version = '0.1.0';
+
+function parseOutput(options, value) {
+  return value.toString().includes(',')
+    ? parseFloat(formatUnits(value.toString().split(',')[options.outputIndexToReturn], options.decimals))
+    : parseFloat(formatUnits(value.toString(), options.decimals))
+}
+
+export async function strategy(
+  space,
+  network,
+  provider,
+  addresses,
+  options,
+  snapshot
+) {
+  const blockTag = typeof snapshot === 'number' ? snapshot : 'latest';
+  const response = await multicall(
+    network,
+    provider,
+    [options.methodABI],
+    addresses.map((address: any) => [
+      options.address,
+      options.methodABI.name,
+      [address]
+    ]),
+    { blockTag }
+  );
+  return Object.fromEntries(
+    response.map((value, i) => [
+      addresses[i],
+      parseOutput(options, value)
+    ])
+  );
+}

src/strategies/index.ts

@@ -11,6 +11,7 @@ import * as antiWhale from './anti-whale';
 import * as balancer from './balancer';
 import * as balancerSmartPool from './balancer-smart-pool';
 import * as contractCall from './contract-call';
+import * as contractCallView from './contract-call-view';
 import * as dfynFarms from './dfyn-staked-in-farms';
 import * as dfynVaults from './dfyn-staked-in-vaults';
 import * as vDfynVault from './balance-in-vdfyn-vault';
@@ -428,6 +429,7 @@ const strategies = {
   'balance-in-vdfyn-vault': vDfynVault,
   'erc20-received': erc20Received,
   'contract-call': contractCall,
+  'contract-call-view': contractCallView,
   defiplaza: defiplaza,
   'dfyn-staked-in-farms': dfynFarms,
   'dfyn-staked-in-vaults': dfynVaults,