feat: hooks necessary files

src/hooks/evm_hook_call.rs

@@ -0,0 +1,87 @@
+use hedera_proto::services;
+
+use crate::{
+    FromProtobuf,
+    ToProtobuf,
+};
+
+/// An EVM hook call.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct EvmHookCall {
+    /// The call data for the EVM hook.
+    pub call_data: Option<Vec<u8>>,
+    /// The gas limit for the hook call.
+    pub gas_limit: Option<u64>,
+}
+
+impl EvmHookCall {
+    /// Create a new `EvmHookCall`.
+    pub fn new(call_data: Option<Vec<u8>>) -> Self {
+        Self { call_data, gas_limit: None }
+    }
+
+    /// Set the call data for the hook.
+    pub fn set_call_data(&mut self, call_data: Vec<u8>) -> &mut Self {
+        self.call_data = Some(call_data);
+        self
+    }
+
+    /// Set the gas limit for the hook call.
+    pub fn set_gas_limit(&mut self, gas_limit: u64) -> &mut Self {
+        self.gas_limit = Some(gas_limit);
+        self
+    }
+}
+
+impl ToProtobuf for EvmHookCall {
+    type Protobuf = services::EvmHookCall;
+
+    fn to_protobuf(&self) -> Self::Protobuf {
+        services::EvmHookCall {
+            data: self.call_data.clone().unwrap_or_default(),
+            gas_limit: self.gas_limit.unwrap_or(0),
+        }
+    }
+}
+
+impl FromProtobuf<services::EvmHookCall> for EvmHookCall {
+    fn from_protobuf(pb: services::EvmHookCall) -> crate::Result<Self> {
+        Ok(Self {
+            call_data: if pb.data.is_empty() { None } else { Some(pb.data) },
+            gas_limit: Some(pb.gas_limit),
+        })
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_evm_hook_call_creation() {
+        let call_data = vec![1, 2, 3, 4, 5];
+        let hook_call = EvmHookCall::new(Some(call_data.clone()));
+
+        assert_eq!(hook_call.call_data, Some(call_data));
+    }
+
+    #[test]
+    fn test_evm_hook_call_setters() {
+        let mut hook_call = EvmHookCall::new(None);
+        let call_data = vec![6, 7, 8, 9, 10];
+
+        hook_call.set_call_data(call_data.clone());
+        assert_eq!(hook_call.call_data, Some(call_data));
+    }
+
+    #[test]
+    fn test_evm_hook_call_protobuf_roundtrip() {
+        let call_data = vec![11, 12, 13, 14, 15];
+        let original = EvmHookCall::new(Some(call_data));
+
+        let protobuf = original.to_protobuf();
+        let reconstructed = EvmHookCall::from_protobuf(protobuf).unwrap();
+
+        assert_eq!(original, reconstructed);
+    }
+}

src/hooks/evm_hook_spec.rs

@@ -0,0 +1,125 @@
+use hedera_proto::services;
+
+use crate::contract::ContractId;
+use crate::{
+    FromProtobuf,
+    ToProtobuf,
+};
+
+/// Shared specifications for an EVM hook. May be used for any extension point.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct EvmHookSpec {
+    /// The id of a contract that implements the extension point API with EVM bytecode.
+    pub contract_id: Option<ContractId>,
+}
+
+impl EvmHookSpec {
+    /// Create a new `EvmHookSpec`.
+    pub fn new(contract_id: Option<ContractId>) -> Self {
+        Self { contract_id }
+    }
+}
+
+impl ToProtobuf for EvmHookSpec {
+    type Protobuf = services::EvmHookSpec;
+
+    fn to_protobuf(&self) -> Self::Protobuf {
+        services::EvmHookSpec {
+            bytecode_source: self
+                .contract_id
+                .as_ref()
+                .map(|id| services::evm_hook_spec::BytecodeSource::ContractId(id.to_protobuf())),
+        }
+    }
+}
+
+impl FromProtobuf<services::EvmHookSpec> for EvmHookSpec {
+    #[allow(unreachable_patterns)]
+    fn from_protobuf(pb: services::EvmHookSpec) -> crate::Result<Self> {
+        let contract_id = match pb.bytecode_source {
+            Some(services::evm_hook_spec::BytecodeSource::ContractId(id)) => {
+                Some(ContractId::from_protobuf(id)?)
+            }
+            // For future unsupported bytecode sources.
+            Some(_) => {
+                return Err(crate::Error::from_protobuf("unsupported EvmHookSpec.bytecode_source"));
+            }
+            None => None,
+        };
+        Ok(Self { contract_id })
+    }
+}
+
+#[cfg(test)]
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::contract::ContractId;
+
+    #[test]
+    fn new_with_contract_id_sets_field() {
+        let cid = ContractId::new(0, 0, 123);
+        let spec = EvmHookSpec::new(Some(cid));
+        assert_eq!(spec.contract_id, Some(cid));
+    }
+
+    #[test]
+    fn new_without_contract_id_sets_none() {
+        let spec = EvmHookSpec::new(None);
+        assert!(spec.contract_id.is_none());
+    }
+
+    #[test]
+    fn to_protobuf_with_contract_id_sets_bytecode_source() {
+        let cid = ContractId::new(0, 0, 321);
+        let spec = EvmHookSpec::new(Some(cid));
+        let pb = spec.to_protobuf();
+
+        let got = match pb.bytecode_source {
+            Some(hedera_proto::services::evm_hook_spec::BytecodeSource::ContractId(id)) => {
+                Some(ContractId::from_protobuf(id).unwrap())
+            }
+            None => None,
+        };
+
+        assert_eq!(got, Some(cid));
+    }
+
+    #[test]
+    fn to_protobuf_without_contract_id_sets_none() {
+        let spec = EvmHookSpec::new(None);
+        let pb = spec.to_protobuf();
+        assert!(pb.bytecode_source.is_none());
+    }
+
+    #[test]
+    fn from_protobuf_with_contract_id_parses() {
+        let cid = ContractId::new(0, 0, 555);
+        let pb = hedera_proto::services::EvmHookSpec {
+            bytecode_source: Some(
+                hedera_proto::services::evm_hook_spec::BytecodeSource::ContractId(
+                    cid.to_protobuf(),
+                ),
+            ),
+        };
+
+        let spec = EvmHookSpec::from_protobuf(pb).unwrap();
+        assert_eq!(spec.contract_id, Some(cid));
+    }
+
+    #[test]
+    fn from_protobuf_without_contract_id_parses_none() {
+        let pb = hedera_proto::services::EvmHookSpec { bytecode_source: None };
+        let spec = EvmHookSpec::from_protobuf(pb).unwrap();
+        assert!(spec.contract_id.is_none());
+    }
+
+    #[test]
+    fn protobuf_roundtrip() {
+        let cid = ContractId::new(0, 0, 999);
+        let original = EvmHookSpec::new(Some(cid));
+        let pb = original.to_protobuf();
+        let reconstructed = EvmHookSpec::from_protobuf(pb).unwrap();
+        assert_eq!(original, reconstructed);
+    }
+}

src/hooks/fungible_hook_call.rs

@@ -0,0 +1,73 @@
+use hedera_proto::services;
+
+use crate::hooks::{
+    EvmHookCall,
+    FungibleHookType,
+    HookCall,
+};
+use crate::{
+    FromProtobuf,
+    ToProtobuf,
+};
+
+/// A typed hook call for fungible (HBAR and FT) transfers.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct FungibleHookCall {
+    /// The underlying hook call data.
+    pub hook_call: HookCall,
+    /// The type of fungible hook.
+    pub hook_type: FungibleHookType,
+}
+
+impl FungibleHookCall {
+    /// Create a new `FungibleHookCall`.
+    pub fn new(hook_call: HookCall, hook_type: FungibleHookType) -> Self {
+        Self { hook_call, hook_type }
+    }
+
+    /// Internal method to create from protobuf with a known type.
+    pub(crate) fn from_protobuf_with_type(
+        pb: services::HookCall,
+        hook_type: FungibleHookType,
+    ) -> crate::Result<Self> {
+        Ok(Self { hook_call: HookCall::from_protobuf(pb)?, hook_type })
+    }
+}
+
+impl ToProtobuf for FungibleHookCall {
+    type Protobuf = services::HookCall;
+
+    fn to_protobuf(&self) -> Self::Protobuf {
+        self.hook_call.to_protobuf()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_fungible_hook_call_creation() {
+        let hook_id = 123;
+        let hook_type = FungibleHookType::PreTxAllowanceHook;
+        let mut hook_call_obj = HookCall::new(None, None);
+        hook_call_obj.set_hook_id(hook_id);
+        let hook_call = FungibleHookCall::new(hook_call_obj, hook_type);
+
+        assert_eq!(hook_call.hook_call.hook_id, Some(hook_id));
+        assert_eq!(hook_call.hook_type, hook_type);
+    }
+
+    #[test]
+    fn test_fungible_hook_call_with_call() {
+        let call_data = vec![1, 2, 3, 4, 5];
+        let evm_call = EvmHookCall::new(Some(call_data));
+        let hook_type = FungibleHookType::PrePostTxAllowanceHook;
+        let mut hook_call_obj = HookCall::new(None, None);
+        hook_call_obj.set_call(evm_call.clone());
+        let hook_call = FungibleHookCall::new(hook_call_obj, hook_type);
+
+        assert_eq!(hook_call.hook_call.call, Some(evm_call));
+        assert_eq!(hook_call.hook_type, hook_type);
+    }
+}

src/hooks/fungible_hook_type.rs

@@ -0,0 +1,28 @@
+/// Types of fungible (HBAR and FT) hooks.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[repr(u8)]
+pub enum FungibleHookType {
+    /// A single call made before attempting the transfer.
+    PreTxAllowanceHook = 0,
+    /// Two calls - first before attempting the transfer (allowPre), and second after
+    /// attempting the transfer (allowPost).
+    PrePostTxAllowanceHook = 1,
+}
+
+impl FungibleHookType {
+    /// Returns the numeric value of the hook type.
+    pub fn value(&self) -> u8 {
+        *self as u8
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_fungible_hook_type_values() {
+        assert_eq!(FungibleHookType::PreTxAllowanceHook.value(), 0);
+        assert_eq!(FungibleHookType::PrePostTxAllowanceHook.value(), 1);
+    }
+}