From 310478740d13b6727d4d7aec0fbf884134b78762 Mon Sep 17 00:00:00 2001
From: Martin Redmond <21436+reds@users.noreply.github.com>
Date: Fri, 19 Mar 2021 06:56:10 -0400
Subject: [PATCH] accounts/abi/bind: add NoSend transact option (#22446)

This adds a new option to avoid sending the transaction which is
created by calling a bound contract method.
---
 accounts/abi/bind/base.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/accounts/abi/bind/base.go b/accounts/abi/bind/base.go
index 4d5390d15bc2..fe9b2c3e3411 100644
--- a/accounts/abi/bind/base.go
+++ b/accounts/abi/bind/base.go
@@ -58,6 +58,8 @@ type TransactOpts struct {
 	GasLimit uint64   // Gas limit to set for the transaction execution (0 = estimate)
 
 	Context context.Context // Network context to support cancellation and timeouts (nil = no timeout)
+
+	NoSend bool // Do all transact steps but do not send the transaction
 }
 
 // FilterOpts is the collection of options to fine tune filtering for events
@@ -242,6 +244,9 @@ func (c *BoundContract) transact(opts *TransactOpts, contract *common.Address, i
 	if err != nil {
 		return nil, err
 	}
+	if opts.NoSend {
+		return signedTx, nil
+	}
 	if err := c.transactor.SendTransaction(ensureContext(opts.Context), signedTx); err != nil {
 		return nil, err
 	}