ABI's from //contract/out URLs; arbsep; placement fee considers upcoming fee changes; vault detection bugfixes; order placement bugfixes; BETA

src/blockchain/contract.js

@@ -1,5 +1,7 @@
 import {ethers} from "ethers";
-import {queryHelperAbi} from "@/blockchain/abi.js";
+import {AbiURLCache} from "../common.js";
+
+export const abiCache = new AbiURLCache('/contract/out/')
 
 
 export function vaultAddress( factory, vaultInitCodeHash, owner, num=0) {
@@ -20,6 +22,23 @@ export function contractOrNull(addr,abi,provider) {
 }
 
 export async function queryHelperContract(helper, provider) {
-    return contractOrNull(helper, queryHelperAbi, provider)
+    return newContract(helper, 'QueryHelper', provider)
 }
 
+
+// do not supply extensions with name or file: e.g.
+// use newContract(addr, 'IVaultLogic', provider, 'IVault') to get the ABI from IVault.sol/IVaultLogic.json
+export async function newContract(addr, name, provider) {
+    const abi = await abiCache.get(name)
+    return new ethers.Contract(addr, abi, provider)
+}
+
+
+export async function erc20Contract(addr, provider) {
+    return newContract(addr, 'IERC20Metadata', provider)
+}
+
+
+export async function vaultContract(addr, provider) {
+    return await newContract(addr, 'IVault', provider)
+}