Add balance checks to demo smoketest

scripts/smoke-test-demo

@@ -5,7 +5,7 @@ set -e
 # load env vars in .env
 set -a; source .env; set +a;
 
-SEQUENCER_API=http://localhost:$ESPRESSO_SEQUENCER_API_PORT
+SEQUENCER_API=http://localhost:$ESPRESSO_SEQUENCER1_API_PORT
 LOAD_GENERATOR=http://localhost:$ESPRESSO_SUBMIT_TRANSACTIONS_PRIVATE_PORT
 SEQUENCER_BLOCKS_TIMEOUT=120
 
@@ -29,17 +29,31 @@ function wait_for() {
 	echo "Endpoint $what @ $url is Ok, after $elapsed seconds"
 }
 
+# usage: get_balance <address> <block>
+function get_balance() {
+	(
+		unset MNEMONIC
+		cargo run --release --all-features --bin bridge -- balance -e $SEQUENCER_API -a $1 -b $2
+	)
+}
+
 # Wait for the load generator to start.
 wait_for 300 "demo load generator" "$LOAD_GENERATOR/healthcheck"
 
 # Get the block height and number of transactions, wait some time, and check that these numbers have
 # both increased.
 block_height=`curl -sL $SEQUENCER_API/node/block-height`
 num_tx=`curl -sL $SEQUENCER_API/node/transactions/count`
+# Get the balance of the builder and burner accounts. The former should decrease over time while the
+# latter should increase.
+builder_balance=`get_balance 0x23618e81E3f5cdF7f54C3d65f7FBc0aBf5B21E8f $block_height`
+burner_balance=`get_balance 0x0000000000000000000000000000000000000000 $block_height`
 
 echo "Initial state:"
 echo "  block_height: $block_height"
 echo "  transactions: $num_tx"
+echo "  builder_balance: $builder_balance"
+echo "  burner_balance: $burner_balance"
 
 # Bash magic to get the current time in seconds since start of this shell
 START=$SECONDS
@@ -50,10 +64,21 @@ while true; do
 	new_block_height=`curl -sL $SEQUENCER_API/node/block-height`
 	new_num_tx=`curl -sL $SEQUENCER_API/node/transactions/count`
 	if [[ $new_block_height -gt $block_height && $new_num_tx -gt $num_tx ]]; then
+		new_builder_balance=`get_balance 0x23618e81E3f5cdF7f54C3d65f7FBc0aBf5B21E8f $new_block_height`
+		new_burner_balance=`get_balance 0x0000000000000000000000000000000000000000 $new_block_height`
+
 		echo "Final state:"
 		echo "  block_height: $new_block_height"
 		echo "  transactions: $new_num_tx"
+		echo "  builder_balance: $new_builder_balance"
+		echo "  burner_balance: $new_burner_balance"
 		echo "Block height and transaction count are increasing. Great!"
+
+		if [[ $((builder_balance + burner_balance)) != $((new_builder_balance + new_burner_balance)) ]]; then
+			echo "Balance not conserved!"
+			exit 1
+		fi
+
 		break
 	fi
 	sleep 1