Fix Gateway Evaluate ignoring endpoint option (#153)

* Fix Gateway Evaluate ignoring endpoint option

This PR fixes the issue FABG-1019. The current implementation of
Transaction Evalaute ignores the endorsing peers option when set. This
leads to unexpected behavor when txn object is used to perform evaluate
and submit.

Signed-off-by: Marcus Brandenburger <[email protected]>

* fixup! Fix Gateway Evaluate ignoring endpoint option

Signed-off-by: Marcus Brandenburger <[email protected]>

Author: mbrandenburger

pkg/gateway/transaction.go

@@ -86,6 +86,9 @@ func (txn *Transaction) Evaluate(args ...string) ([]byte, error) {
 	txn.request.Args = bytes
 
 	var options []channel.RequestOption
+	if txn.endorsingPeers != nil {
+		options = append(options, channel.WithTargetEndpoints(txn.endorsingPeers...))
+	}
 	options = append(options, channel.WithTimeout(fab.Query, txn.contract.network.gateway.options.Timeout))
 
 	response, err := txn.contract.client.Query(

pkg/gateway/transaction_test.go

@@ -70,6 +70,7 @@ func TestTransactionOptions(t *testing.T) {
 		t.Fatalf("Incorrect endorsing peer: %s", endorsers[0])
 	}
 
+	txn.Evaluate("arg1", "arg2")
 	txn.Submit("arg1", "arg2")
 }