fix: add warn where trigger_value is below 0.1 grt (#340)

Author: carlosvdr

config/src/config.rs

@@ -94,6 +94,27 @@ impl Config {
             ),
             _ => {}
         }
+        let grt_wei = self.tap.max_amount_willing_to_lose_grt.get_value();
+        let decimal = BigDecimal::from_u128(grt_wei).unwrap();
+        let divisor = &self.tap.rav_request.trigger_value_divisor;
+        let trigger_value = (decimal / divisor)
+            .to_u128()
+            .expect("Could not represent the trigger value in u128");
+        let minimum_recommended_for_max_willing_to_lose_grt = 0.1;
+        if trigger_value
+            < minimum_recommended_for_max_willing_to_lose_grt
+                .to_u128()
+                .unwrap()
+        {
+            warn!(
+                "Trigger value is too low, currently below 0.1 GRT. \
+                Please modify `max_amount_willing_to_lose_grt` or `trigger_value_divisor`. \
+                It is best to have a higher trigger value, ideally above 1 GRT. \
+                Anything lower and the system may constantly deny the sender. \
+                `Trigger value`  is defined by: \
+                (max_amount_willing_to_lose_grt / trigger_value_divisor) "
+            )
+        }
 
         let ten: BigDecimal = 10.into();
         let usual_grt_price = BigDecimal::from_str("0.0001").unwrap() * ten;