chore(katana-pool): rename error for clarity

crates/katana/pool/src/lib.rs

@@ -12,8 +12,9 @@ use katana_primitives::transaction::{ExecutableTxWithHash, TxHash};
 use ordering::{FiFo, PoolOrd};
 use pool::Pool;
 use tx::{PendingTx, PoolTransaction};
+use validation::error::InvalidTransactionError;
 use validation::stateful::TxValidator;
-use validation::{InvalidTransactionError, Validator};
+use validation::Validator;
 
 /// Katana default transacstion pool type.
 pub type TxPool = Pool<ExecutableTxWithHash, TxValidator, FiFo<ExecutableTxWithHash>>;

crates/katana/pool/src/pool.rs

@@ -10,7 +10,8 @@ use tracing::{error, info, warn};
 
 use crate::ordering::PoolOrd;
 use crate::tx::{PendingTx, PoolTransaction, TxId};
-use crate::validation::{InvalidTransactionError, ValidationOutcome, Validator};
+use crate::validation::error::InvalidTransactionError;
+use crate::validation::{ValidationOutcome, Validator};
 use crate::{PoolError, PoolResult, TransactionPool};
 
 #[derive(Debug)]

crates/katana/pool/src/validation/error.rs

@@ -0,0 +1,66 @@
+use katana_primitives::class::ClassHash;
+use katana_primitives::contract::{ContractAddress, Nonce};
+use katana_primitives::Felt;
+
+// TODO: figure out how to combine this with ExecutionError
+#[derive(Debug, thiserror::Error)]
+pub enum InvalidTransactionError {
+    /// Error when the account's balance is insufficient to cover the specified transaction fee.
+    #[error("Max fee ({max_fee}) exceeds balance ({balance}).")]
+    InsufficientFunds {
+        /// The specified transaction fee.
+        max_fee: u128,
+        /// The account's balance of the fee token.
+        balance: Felt,
+    },
+
+    /// Error when the specified transaction fee is insufficient to cover the minimum fee required
+    /// to start the invocation (including the account's validation logic).
+    ///
+    /// It is a static check that is performed before the transaction is invoked to ensure the
+    /// transaction can cover the intrinsics cost ie data availability, etc.
+    ///
+    /// This is different from an error due to transaction runs out of gas during execution ie.
+    /// the specified max fee is lower than the amount needed to finish the transaction execution
+    /// (either validation or execution).
+    #[error("Intrinsic transaction fee is too low")]
+    IntrinsicFeeTooLow {
+        /// The minimum required for the transaction to be executed.
+        min: u128,
+        /// The specified transaction fee.
+        max_fee: u128,
+    },
+
+    /// Error when the account's validation logic fails (ie __validate__ function).
+    #[error("{error}")]
+    ValidationFailure {
+        /// The address of the contract that failed validation.
+        address: ContractAddress,
+        /// The class hash of the account contract.
+        class_hash: ClassHash,
+        /// The error message returned by Blockifier.
+        // TODO: this should be a more specific error type.
+        error: String,
+    },
+
+    /// Error when the transaction's sender is not an account contract.
+    #[error("Sender is not an account")]
+    NonAccount {
+        /// The address of the contract that is not an account.
+        address: ContractAddress,
+    },
+
+    /// Error when the transaction is using a nonexpected nonce.
+    #[error(
+        "Invalid transaction nonce of contract at address {address}. Account nonce: \
+         {current_nonce:#x}; got: {tx_nonce:#x}."
+    )]
+    InvalidNonce {
+        /// The address of the contract that has the invalid nonce.
+        address: ContractAddress,
+        /// The current nonce of the sender's account.
+        current_nonce: Nonce,
+        /// The nonce that the tx is using.
+        tx_nonce: Nonce,
+    },
+}

crates/katana/pool/src/validation/mod.rs

@@ -1,9 +1,9 @@
+pub mod error;
 pub mod stateful;
 
-use katana_primitives::class::ClassHash;
-use katana_primitives::contract::{ContractAddress, Nonce};
+use error::InvalidTransactionError;
+use katana_primitives::contract::Nonce;
 use katana_primitives::transaction::TxHash;
-use katana_primitives::Felt;
 
 use crate::tx::PoolTransaction;
 
@@ -16,56 +16,6 @@ pub struct Error {
     pub error: Box<dyn std::error::Error>,
 }
 
-// TODO: figure out how to combine this with ExecutionError
-#[derive(Debug, thiserror::Error)]
-pub enum InvalidTransactionError {
-    /// Error when the account's balance is insufficient to cover the specified transaction fee.
-    #[error("Max fee ({max_fee}) exceeds balance ({balance}).")]
-    InsufficientFunds {
-        /// The specified transaction fee.
-        max_fee: u128,
-        /// The account's balance of the fee token.
-        balance: Felt,
-    },
-
-    /// Error when the specified transaction fee is insufficient to cover the minimum fee required.
-    #[error("The specified tx max fee is insufficient")]
-    InsufficientMaxFee { min_fee: u128, max_fee: u128 },
-
-    /// Error when the account's validation logic fails (ie __validate__ function).
-    #[error("{error}")]
-    ValidationFailure {
-        /// The address of the contract that failed validation.
-        address: ContractAddress,
-        /// The class hash of the account contract.
-        class_hash: ClassHash,
-        /// The error message returned by Blockifier.
-        // TODO: this should be a more specific error type.
-        error: String,
-    },
-
-    /// Error when the transaction's sender is not an account contract.
-    #[error("sender is not an account")]
-    NonAccount {
-        /// The address of the contract that is not an account.
-        address: ContractAddress,
-    },
-
-    /// Error when the transaction is using a nonexpected nonce.
-    #[error(
-        "Invalid transaction nonce of contract at address {address}. Account nonce: \
-         {current_nonce:#x}; got: {tx_nonce:#x}."
-    )]
-    InvalidNonce {
-        /// The address of the contract that has the invalid nonce.
-        address: ContractAddress,
-        /// The current nonce of the sender's account.
-        current_nonce: Nonce,
-        /// The nonce that the tx is using.
-        tx_nonce: Nonce,
-    },
-}
-
 pub type ValidationResult<T> = Result<ValidationOutcome<T>, Error>;
 
 /// A trait for validating transactions before they are added to the transaction pool.

crates/katana/pool/src/validation/stateful.rs

@@ -209,7 +209,7 @@ fn map_invalid_tx_err(
                 TransactionFeeError::MaxFeeTooLow { min_fee, max_fee } => {
                     let max_fee = max_fee.0;
                     let min_fee = min_fee.0;
-                    Ok(InvalidTransactionError::InsufficientMaxFee { max_fee, min_fee })
+                    Ok(InvalidTransactionError::IntrinsicFeeTooLow { max_fee, min: min_fee })
                 }
 
                 _ => Err(Box::new(err)),

crates/katana/rpc/rpc-types/src/error/starknet.rs

@@ -1,7 +1,7 @@
 use jsonrpsee::core::Error;
 use jsonrpsee::types::error::CallError;
 use jsonrpsee::types::ErrorObject;
-use katana_pool::validation::InvalidTransactionError;
+use katana_pool::validation::error::InvalidTransactionError;
 use katana_pool::PoolError;
 use katana_primitives::event::ContinuationTokenError;
 use katana_provider::error::ProviderError;
@@ -182,7 +182,7 @@ impl From<Box<InvalidTransactionError>> for StarknetApiError {
     fn from(error: Box<InvalidTransactionError>) -> Self {
         match error.as_ref() {
             InvalidTransactionError::InsufficientFunds { .. } => Self::InsufficientAccountBalance,
-            InvalidTransactionError::InsufficientMaxFee { .. } => Self::InsufficientMaxFee,
+            InvalidTransactionError::IntrinsicFeeTooLow { .. } => Self::InsufficientMaxFee,
             InvalidTransactionError::NonAccount { .. } => Self::NonAccount,
             InvalidTransactionError::InvalidNonce { .. } => {
                 Self::InvalidTransactionNonce { reason: error.to_string() }