fix(@desktop/wallet): Iterate over collectible with balance

src/status/libstatus/core.nim

@@ -21,6 +21,7 @@ proc callPrivateRPC*(methodName: string, payload = %* []): string =
     let response = status_go.callPrivateRPC($inputJSON)
     result = $response
     if parseJSON(result).hasKey("error"):
+      writeStackTrace()
       error "rpc response error", result, payload, methodName
   except Exception as e:
     error "error doing rpc request", methodName = methodName, exception=e.msg

src/status/wallet/collectibles.nim

@@ -56,17 +56,34 @@ proc tokenOfOwnerByIndex(contract: Erc721Contract, address: Address, index: Stui
     return -1
   result = fromHex[int](res)
 
+proc balanceOf(contract: Erc721Contract, address: Address): int =
+  let
+    balanceOf = BalanceOf(address: address)
+    payload = %* [{
+      "to": $contract.address,
+      "data": contract.methods["balanceOf"].encodeAbi(balanceOf)
+    }, "latest"]
+    response = callPrivateRPC("eth_call", payload)
+    jsonResponse = parseJson($response)
+  if (not jsonResponse.hasKey("result")):
+    return 0
+  let res = jsonResponse["result"].getStr
+  if (res == "0x"):
+    return 0
+  result = fromHex[int](res)
+
 proc tokensOfOwnerByIndex(contract: Erc721Contract, address: Address): seq[int] =
   var index = 0
   var token: int
+  var maxIndex: int = balanceOf(contract, address)
   result = @[]
-  while (true):
+  while index < maxIndex and result.len <= MAX_TOKENS:
     token = tokenOfOwnerByIndex(contract, address, index.u256)
-    if (token == -1 or token == 0 or result.len > MAX_TOKENS):
-      return result
     result.add(token)
     index = index + 1
 
+  return result
+
 proc getCryptoKittiesBatch*(address: Address, offset: int = 0): seq[Collectible] =
   var cryptokitties: seq[Collectible]
   cryptokitties = @[]