Explicitly calculating withdrawal shares pnl instead of preview (#1024)

lib/chainsync/chainsync/analysis/calc_pnl.py

@@ -96,10 +96,12 @@ def calc_single_closeout(
     elif tokentype == "WITHDRAWAL_SHARE":
         fn_args = (amount, min_output, address, as_underlying)
         try:
-            preview_result = smart_contract_preview_transaction(
-                contract, sender, "redeemWithdrawalShares", *fn_args, block_identifier=position["blockNumber"]
-            )
-            out_pnl = preview_result["proceeds"] / Decimal(1e18)
+            # For PNL, we assume all withdrawal shares are redeemable
+            # even if there are no withdrawal shares available to withdraw
+            # Hence, we don't use preview transaction here
+            out_pnl = Decimal(
+                amount * pool_info["sharePrice"].values[-1] * pool_info["lpSharePrice"].values[-1]
+            ) / Decimal(1e18)
         except Exception as exception:  # pylint: disable=broad-except
             logging.warning("Exception caught, ignoring: %s", exception)
     else: