refactor(gas): adjust FUEL_DENOM_RATE to reflect actual performance

Cargo.toml

@@ -125,7 +125,7 @@ triehash = "0.8"
 walkdir = "2.5"
 
 # rwasm
-rwasm = { git = "https://github.com/fluentlabs-xyz/rwasm", branch = "devel", default-features = false }
+rwasm = { version = "0.3.2", default-features = false }
 #rwasm = { path = "../rwasm", default-features = false }
 
 [workspace.package]

crates/handler/Cargo.toml

@@ -30,6 +30,7 @@ bytecode.workspace = true
 
 auto_impl.workspace = true
 derive-where.workspace = true
+cfg-if.workspace = true 
 
 # Optional
 serde = { version = "1.0", default-features = false, features = [
@@ -73,4 +74,5 @@ serde = [
     "derive-where/serde"
 ]
 serde-json = ["serde"]
-debug-print = []
+debug-print = []
+fluent-testnet = []  # Compatibility with Fluent testnet

crates/handler/src/validation.rs

@@ -4,7 +4,7 @@ use context_interface::{
     Block, Cfg, ContextTr,
 };
 use core::cmp;
-use interpreter::gas::{self, InitialAndFloorGas, FUEL_DENOM_RATE};
+use interpreter::gas::{self, InitialAndFloorGas};
 use primitives::wasm::WASM_MAGIC_BYTES;
 use primitives::{eip4844, hardfork::SpecId, wasm::wasm_max_code_size, B256};
 
@@ -299,8 +299,20 @@ pub fn validate_initial_tx_gas(
     }
 
     let mut floor_gas = gas.floor_gas;
+
+    // Fuel denomination rate rwasm -> evm
+    // Testnet uses legacy rate (1000), correct rate is 20
+    // see more details here:
+    // https://github.com/fluentlabs-xyz/fluentbase/blob/devel/crates/types/src/lib.rs#L63
+
     if tx.input().starts_with(&WASM_MAGIC_BYTES) {
-        floor_gas /= FUEL_DENOM_RATE;
+        cfg_if::cfg_if! {
+            if #[cfg(feature = "fluent-testnet")] {
+                floor_gas /= 1000;
+            } else {
+                floor_gas /= 20;
+            }
+        }
     }
 
     // EIP-7623: Increase calldata cost

crates/interpreter/src/gas.rs

@@ -167,23 +167,6 @@ impl Gas {
 
         MemoryExtensionResult::Extended
     }
-
-    /// Records the denominated fuel cost by converting the provided raw fuel cost
-    /// with a predefined fuel denomination rate (FUEL_DENOM_RATE) and logs it.
-    /// This operation does not round up due to syncing requirements between gas
-    /// and fuel rates.
-    #[inline]
-    pub fn record_denominated_cost(&mut self, fuel_cost: u64) -> bool {
-        // TODO(dmitry123): "we can't do round ceil here because we need to sync gas/fuel rates"
-        // self.record_cost((fuel_cost + FUEL_DENOM_RATE - 1) / FUEL_DENOM_RATE)
-        self.record_cost(fuel_cost / FUEL_DENOM_RATE)
-    }
-
-    /// Records a denominated fuel refund value.
-    #[inline]
-    pub fn record_denominated_refund(&mut self, fuel_refund: i64) {
-        self.record_refund(fuel_refund / FUEL_DENOM_RATE as i64)
-    }
 }
 
 /// Result of attempting to extend memory during execution.

crates/interpreter/src/gas/constants.rs

@@ -100,8 +100,3 @@ pub const INITCODE_WORD_COST: u64 = 2;
 pub const CALL_STIPEND: u64 = 2300;
 /// Minimum gas that must be provided to a callee.
 pub const MIN_CALLEE_GAS: u64 = CALL_STIPEND;
-
-/// A fuel denomination rate for rWasm vs. EVM opcodes
-///
-/// Make sure this value is synchronized with a Fluentbase version
-pub const FUEL_DENOM_RATE: u64 = 1000;