Merge pull request #42 from curvefi/st-crvUSD

st-crvUSD enhanced approvals

Author: Macket

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@curvefi/lending-api",
-  "version": "2.3.4",
+  "version": "2.3.5",
   "description": "JavaScript library for Curve Lending",
   "main": "lib/index.js",
   "author": "Macket",

src/index.ts

@@ -20,13 +20,15 @@ import {
     maxDeposit,
     previewDeposit,
     depositIsApproved,
+    depositAllowance,
     depositApproveEstimateGas,
     depositApprove,
     depositEstimateGas,
     deposit,
     maxMint,
     previewMint,
     mintIsApproved,
+    mintAllowance,
     mintApproveEstimateGas,
     mintApprove,
     mintEstimateGas,
@@ -89,11 +91,13 @@ const lending = {
         maxDeposit,
         previewDeposit,
         depositIsApproved,
+        depositAllowance,
         depositApprove,
         deposit,
         maxMint,
         previewMint,
         mintIsApproved,
+        mintAllowance,
         mintApprove,
         mint,
         maxWithdraw,

src/markets/MarketConstructor.ts

@@ -1,5 +1,5 @@
 import { OneWayMarketTemplate} from "./OneWayMarketTemplate.js";
-import {lending} from "../lending";
+import { lending } from "../lending.js";
 
 export const getOneWayMarket = (oneWayMarketId: string): OneWayMarketTemplate => {
     const marketData = lending.constants.ONE_WAY_MARKETS[oneWayMarketId];

src/st-crvUSD.ts

@@ -4,9 +4,11 @@ import {
     ensureAllowanceEstimateGas,
     formatUnits,
     hasAllowance,
+    getAllowance,
     parseUnits,
     smartNumber,
     getBalances,
+    MAX_ALLOWANCE,
 } from "./utils.js";
 import { lending } from "./lending.js";
 import { TAmount, TGas } from "./interfaces.js";
@@ -67,12 +69,16 @@ export const depositIsApproved = async(assets: TAmount): Promise<boolean> => {
     return await hasAllowance([lending.constants.ALIASES.crvUSD], [assets], lending.signerAddress, lending.constants.ALIASES.st_crvUSD);
 }
 
+export const depositAllowance = async(): Promise<string[]> => {
+    return await getAllowance([lending.constants.ALIASES.crvUSD], lending.signerAddress, lending.constants.ALIASES.st_crvUSD);
+}
+
 export const depositApproveEstimateGas = async (assets: TAmount): Promise<TGas> => {
     return await ensureAllowanceEstimateGas([lending.constants.ALIASES.crvUSD], [assets], lending.constants.ALIASES.st_crvUSD);
 }
 
-export const depositApprove = async (assets: TAmount): Promise<string[]> => {
-    return await ensureAllowance([lending.constants.ALIASES.crvUSD], [assets], lending.constants.ALIASES.st_crvUSD);
+export const depositApprove = async (assets: TAmount, isMax = true): Promise<string[]> => {
+    return await ensureAllowance([lending.constants.ALIASES.crvUSD], [assets], lending.constants.ALIASES.st_crvUSD, isMax);
 }
 
 const _deposit = async (assets: TAmount, estimateGas = false): Promise<string | TGas> => {
@@ -120,14 +126,24 @@ export const mintIsApproved = async (shares: TAmount): Promise<boolean> => {
     return await hasAllowance([lending.constants.ALIASES.crvUSD], [assets], lending.signerAddress, lending.constants.ALIASES.st_crvUSD);
 }
 
+export const mintAllowance = async (): Promise<string[]> => {
+    const assets = await getAllowance([lending.constants.ALIASES.crvUSD], lending.signerAddress, lending.constants.ALIASES.st_crvUSD);
+    try {
+        return [await convertToShares(assets[0])]
+    } catch (e) {
+        if (parseUnits(assets[0]) === MAX_ALLOWANCE) return [lending.formatUnits(MAX_ALLOWANCE)];
+        throw e;
+    }
+}
+
 export const mintApproveEstimateGas = async (shares: TAmount): Promise<TGas> => {
     const assets = await previewMint(shares);
     return await ensureAllowanceEstimateGas([lending.constants.ALIASES.crvUSD], [assets], lending.constants.ALIASES.st_crvUSD);
 }
 
-export const mintApprove = async (shares: TAmount): Promise<string[]> => {
+export const mintApprove = async (shares: TAmount, isMax = true): Promise<string[]> => {
     const assets = await previewMint(shares);
-    return await ensureAllowance([lending.constants.ALIASES.crvUSD], [assets], lending.constants.ALIASES.st_crvUSD);
+    return await ensureAllowance([lending.constants.ALIASES.crvUSD], [assets], lending.constants.ALIASES.st_crvUSD, isMax);
 }
 
 const _mint = async (shares: TAmount, estimateGas = false): Promise<string | TGas> => {

src/utils.ts

@@ -7,6 +7,7 @@ import { _getUsdPricesFromApi } from "./external-api.js";
 import { lending } from "./lending.js";
 import { JsonFragment } from "ethers/lib.esm";
 import { L2Networks } from "./constants/L2Networks.js";
+import memoize from "memoizee";
 
 export const MAX_ALLOWANCE = BigInt("115792089237316195423570985008687907853269984665640564039457584007913129639935");  // 2**256 - 1
 export const MAX_ACTIVE_BAND = BigInt("57896044618658097711785492504343953926634992332820282019728792003956564819967");  // 2**255 - 1
@@ -186,12 +187,11 @@ export const getBalances = async (coins: string[], address = ""): Promise<string
     return _balances.map((_b, i: number ) => formatUnits(_b, decimals[i]));
 }
 
-export const _getAllowance = async (coins: string[], address: string, spender: string): Promise<bigint[]> => {
+export const _getAllowance = memoize(async (coins: string[], address: string, spender: string): Promise<bigint[]> => {
     const _coins = [...coins]
     const ethIndex = getEthIndex(_coins);
     if (ethIndex !== -1) {
         _coins.splice(ethIndex, 1);
-
     }
 
     let allowance: bigint[];
@@ -202,13 +202,18 @@ export const _getAllowance = async (coins: string[], address: string, spender: s
         allowance = await lending.multicallProvider.all(contractCalls);
     }
 
-
     if (ethIndex !== -1) {
         allowance.splice(ethIndex, 0, MAX_ALLOWANCE);
     }
 
     return allowance;
-}
+},
+{
+    promise: true,
+    maxAge: 5 * 1000, // 5s
+    primitive: true,
+    length: 3,
+});
 
 // coins can be either addresses or symbols
 export const getAllowance = async (coins: string[], address: string, spender: string): Promise<string[]> => {