Check gas price (#494)

* add gas validation option

* gas price config for chains

* check gas price

* add tests

* fix txt

* make gas price dls

* fix config

foundation/src/main/kotlin/org/drpc/chainsconfig/ChainsConfig.kt

@@ -12,11 +12,29 @@ data class ChainsConfig(private val chains: List<ChainConfig>) : Iterable<Chains
     override fun iterator(): Iterator<ChainConfig> {
         return chains.iterator()
     }
+
     companion object {
         @JvmStatic
         fun default(): ChainsConfig = ChainsConfig(emptyList())
     }
 
+    class GasPriceCondition(private val condition: String) {
+        fun check(value: Long): Boolean {
+            val (op, valueStr) = condition.split(" ")
+            return when (op) {
+                "ne" -> value != valueStr.toLong()
+                "eq" -> value == valueStr.toLong()
+                "gt" -> value > valueStr.toLong()
+                "lt" -> value < valueStr.toLong()
+                "ge" -> value >= valueStr.toLong()
+                "le" -> value <= valueStr.toLong()
+                else -> throw IllegalArgumentException("Unsupported condition: $condition")
+            }
+        }
+
+        fun rules() = condition
+    }
+
     data class ChainConfig(
         val expectedBlockTime: Duration,
         val syncingLagSize: Int,
@@ -30,7 +48,8 @@ data class ChainsConfig(private val chains: List<ChainConfig>) : Iterable<Chains
         val callLimitContract: String?,
         val id: String,
         val blockchain: String,
-        val type: String
+        val type: String,
+        val gasPriceCondition: GasPriceCondition? = null,
     ) {
         companion object {
             @JvmStatic
@@ -50,12 +69,15 @@ data class ChainsConfig(private val chains: List<ChainConfig>) : Iterable<Chains
                 callLimitContract,
                 "undefined",
                 "undefined",
-                "unknown"
+                "unknown",
+                null,
+            )
+
+            @JvmStatic
+            fun defaultWithGasPriceCondition(gasPriceCondition: String) = defaultWithContract(null).copy(
+                gasPriceCondition = GasPriceCondition(gasPriceCondition),
             )
         }
-
-
-
     }
 
     fun resolve(chain: String): ChainConfig {