improve interfaces

engine/src/engine.rs

@@ -47,29 +47,44 @@ impl FCE {
         module_name: MN,
         func_name: FN,
         argument: &[IValue],
-    ) -> Result<Vec<IValue>, FCEError> {
-        match self.modules.get_mut(module_name.as_ref()) {
+    ) -> Result<Vec<IValue>> {
+        self.call_(module_name.as_ref(), func_name.as_ref(), argument)
+    }
+
+    pub fn call_(
+        &mut self,
+        module_name: &str,
+        func_name: &str,
+        argument: &[IValue],
+    ) -> Result<Vec<IValue>> {
+        match self.modules.get_mut(module_name) {
             // TODO: refactor errors
             Some(module) => module.call(func_name.as_ref(), argument),
-            None => Err(FCEError::NoSuchModule(module_name.as_ref().to_string())),
+            None => Err(FCEError::NoSuchModule(module_name.to_string())),
         }
     }
 
     /// Load a new module inside FCE.
-    pub fn load_module<S>(
+    pub fn load_module<S: Into<String>>(
         &mut self,
         module_name: S,
         wasm_bytes: &[u8],
         config: FCEModuleConfig,
-    ) -> Result<(), FCEError>
-    where
-        S: Into<String>,
-    {
+    ) -> Result<()> {
+        self.load_module_(module_name.into(), wasm_bytes, config)
+    }
+
+    pub fn load_module_(
+        &mut self,
+        module_name: String,
+        wasm_bytes: &[u8],
+        config: FCEModuleConfig,
+    ) -> Result<()> {
         let _prepared_wasm_bytes = crate::misc::prepare_module(wasm_bytes, config.mem_pages_count)?;
 
         let module = FCEModule::new(&wasm_bytes, config, &self.modules)?;
 
-        match self.modules.entry(module_name.into()) {
+        match self.modules.entry(module_name) {
             Entry::Vacant(entry) => {
                 entry.insert(module);
                 Ok(())
@@ -79,10 +94,14 @@ impl FCE {
     }
 
     /// Unload previously loaded module.
-    pub fn unload_module<S: AsRef<str>>(&mut self, module_name: S) -> Result<(), FCEError> {
-        match self.modules.remove(module_name.as_ref()) {
+    pub fn unload_module<S: AsRef<str>>(&mut self, module_name: S) -> Result<()> {
+        self.unload_module_(module_name.as_ref())
+    }
+
+    pub fn unload_module_(&mut self, module_name: &str) -> Result<()> {
+        match self.modules.remove(module_name) {
             Some(_) => Ok(()),
-            None => Err(FCEError::NoSuchModule(module_name.as_ref().to_string())),
+            None => Err(FCEError::NoSuchModule(module_name.to_string())),
         }
     }
 
@@ -100,7 +119,7 @@ impl FCE {
     pub fn module_interface<S: AsRef<str>>(
         &self,
         module_name: S,
-    ) -> Result<Vec<FCEFunctionSignature<'_>>, FCEError> {
+    ) -> Result<Vec<FCEFunctionSignature<'_>>> {
         match self.modules.get(module_name.as_ref()) {
             Some(module) => Ok(Self::get_module_function_signatures(module)),
             None => Err(FCEError::NoSuchModule(module_name.as_ref().to_string())),

engine/src/lib.rs

@@ -39,4 +39,7 @@ pub use engine::FCEFunctionSignature;
 pub use errors::FCEError;
 pub use module::IValue;
 pub use module::IType;
-pub use module::{to_interface_value, from_interface_values};
+pub use module::from_interface_values;
+pub use module::to_interface_value;
+
+pub(crate) type Result<T> = std::result::Result<T, FCEError>;

engine/src/misc/prepare.rs

@@ -18,7 +18,7 @@
 // https://github.com/paritytech/substrate/blob/master/srml/contracts/src/wasm/prepare.rs
 // https://github.com/nearprotocol/nearcore/blob/master/runtime/near-vm-runner/src/prepare.rs
 
-use crate::FCEError;
+use crate::Result;
 
 use parity_wasm::{
     builder, elements,
@@ -30,7 +30,7 @@ struct ModuleBootstrapper {
 }
 
 impl<'a> ModuleBootstrapper {
-    fn init(module_code: &[u8]) -> Result<Self, FCEError> {
+    fn init(module_code: &[u8]) -> Result<Self> {
         let module = elements::deserialize_buffer(module_code)?;
 
         Ok(Self { module })
@@ -66,14 +66,14 @@ impl<'a> ModuleBootstrapper {
         }
     }
 
-    fn into_wasm(self) -> Result<Vec<u8>, FCEError> {
+    fn into_wasm(self) -> Result<Vec<u8>> {
         elements::serialize(self.module).map_err(Into::into)
     }
 }
 
 /// Prepares a Wasm module:
 ///   - set memory page count
-pub(crate) fn prepare_module(module: &[u8], mem_pages_count: u32) -> Result<Vec<u8>, FCEError> {
+pub(crate) fn prepare_module(module: &[u8], mem_pages_count: u32) -> Result<Vec<u8>> {
     ModuleBootstrapper::init(module)?
         .set_mem_pages_count(mem_pages_count)
         .into_wasm()

engine/src/module/exports.rs

@@ -14,7 +14,8 @@
  * limitations under the License.
  */
 
-use super::{IValue, IType};
+use super::IValue;
+use super::IType;
 use wasmer_wit::interpreter::wasm;
 
 // In current implementation export simply does nothing, because there is no more

engine/src/module/fce_module.rs

@@ -16,13 +16,15 @@
 
 use super::wit_prelude::*;
 use super::{IType, IValue, WValue};
+use crate::Result;
 use crate::FCEModuleConfig;
 
 use fce_wit_interfaces::FCEWITInterfaces;
-use wasmer_wit::interpreter::Interpreter;
-use wasmer_runtime::{compile, ImportObject};
 use wasmer_core::Instance as WasmerInstance;
 use wasmer_core::import::Namespace;
+use wasmer_runtime::compile;
+use wasmer_runtime::ImportObject;
+use wasmer_wit::interpreter::Interpreter;
 use wit_parser::extract_wit;
 
 use std::collections::HashMap;
@@ -47,7 +49,7 @@ pub(super) struct Callable {
 }
 
 impl Callable {
-    pub fn call(&mut self, args: &[IValue]) -> Result<Vec<IValue>, FCEError> {
+    pub fn call(&mut self, args: &[IValue]) -> Result<Vec<IValue>> {
         use wasmer_wit::interpreter::stack::Stackable;
 
         let result = self
@@ -86,7 +88,7 @@ impl FCEModule {
         wasm_bytes: &[u8],
         fce_module_config: FCEModuleConfig,
         modules: &HashMap<String, FCEModule>,
-    ) -> Result<Self, FCEError> {
+    ) -> Result<Self> {
         let wasmer_module = compile(&wasm_bytes)?;
         let wit = extract_wit(&wasmer_module)?;
         let fce_wit = FCEWITInterfaces::new(wit);
@@ -130,11 +132,7 @@ impl FCEModule {
         })
     }
 
-    pub(crate) fn call(
-        &mut self,
-        function_name: &str,
-        args: &[IValue],
-    ) -> Result<Vec<IValue>, FCEError> {
+    pub(crate) fn call(&mut self, function_name: &str, args: &[IValue]) -> Result<Vec<IValue>> {
         match self.exports_funcs.get_mut(function_name) {
             Some(func) => Arc::make_mut(func).call(args),
             None => Err(FCEError::NoSuchFunction(format!(
@@ -157,7 +155,7 @@ impl FCEModule {
     }
 
     // TODO: change the cloning Callable behaviour after changes of Wasmer API
-    pub(super) fn get_callable(&self, function_name: &str) -> Result<Arc<Callable>, FCEError> {
+    pub(super) fn get_callable(&self, function_name: &str) -> Result<Arc<Callable>> {
         match self.exports_funcs.get(function_name) {
             Some(func) => Ok(func.clone()),
             None => Err(FCEError::NoSuchFunction(format!(
@@ -170,7 +168,7 @@ impl FCEModule {
     fn instantiate_wit_exports(
         wit_instance: Arc<WITInstance>,
         wit: &FCEWITInterfaces<'_>,
-    ) -> Result<HashMap<String, Arc<Callable>>, FCEError> {
+    ) -> Result<HashMap<String, Arc<Callable>>> {
         use fce_wit_interfaces::WITAstType;
 
         wit.implementations()
@@ -218,14 +216,14 @@ impl FCEModule {
                     ))),
                 }
             })
-            .collect::<Result<HashMap<String, Arc<Callable>>, FCEError>>()
+            .collect::<Result<HashMap<String, Arc<Callable>>>>()
     }
 
     // this function deals only with import functions that have an adaptor implementation
     fn adjust_wit_imports(
         wit: &FCEWITInterfaces<'_>,
         wit_instance: Arc<MaybeUninit<WITInstance>>,
-    ) -> Result<ImportObject, FCEError> {
+    ) -> Result<ImportObject> {
         use fce_wit_interfaces::WITAstType;
         use wasmer_core::typed_func::DynamicFunc;
         use wasmer_core::vm::Ctx;
@@ -327,7 +325,7 @@ impl FCEModule {
                     ))),
                 }
             })
-            .collect::<Result<multimap::MultiMap<_, _>, FCEError>>()?;
+            .collect::<Result<multimap::MultiMap<_, _>>>()?;
 
         let mut import_object = ImportObject::new();
 

engine/src/module/mod.rs

@@ -21,11 +21,12 @@ mod wit_instance;
 mod type_converters;
 mod fce_module;
 
-pub(crate) use fce_module::FCEModule;
-
 pub use wasmer_wit::types::InterfaceType as IType;
 pub use wasmer_wit::values::InterfaceValue as IValue;
-pub use wasmer_wit::values::{to_interface_value, from_interface_values};
+pub use wasmer_wit::values::from_interface_values;
+pub use wasmer_wit::values::to_interface_value;
+
+pub(crate) use fce_module::FCEModule;
 pub(self) use wasmer_core::types::Type as WType;
 pub(self) use wasmer_core::types::Value as WValue;
 

engine/src/module/wit_function.rs

@@ -14,10 +14,10 @@
  * limitations under the License.
  */
 
-use super::wit_prelude::FCEError;
 use super::fce_module::FCEModule;
 use super::{IType, IValue, WValue};
 use super::fce_module::Callable;
+use crate::Result;
 
 use wasmer_wit::interpreter::wasm;
 use wasmer_core::instance::DynFunc;
@@ -45,7 +45,7 @@ pub(super) struct WITFunction {
 
 impl WITFunction {
     /// Creates functions from a "usual" (not WIT) module export.
-    pub(super) fn from_export(dyn_func: DynFunc<'static>) -> Result<Self, FCEError> {
+    pub(super) fn from_export(dyn_func: DynFunc<'static>) -> Result<Self> {
         use super::type_converters::wtype_to_itype;
 
         let signature = dyn_func.signature();
@@ -70,10 +70,7 @@ impl WITFunction {
     }
 
     /// Creates function from a module import.
-    pub(super) fn from_import(
-        wit_module: &FCEModule,
-        function_name: &str,
-    ) -> Result<Self, FCEError> {
+    pub(super) fn from_import(wit_module: &FCEModule, function_name: &str) -> Result<Self> {
         let callable = wit_module.get_callable(function_name)?;
 
         let inner = WITFunctionInner::Import { callable };
@@ -111,7 +108,7 @@ impl wasm::structures::LocalImport for WITFunction {
         }
     }
 
-    fn call(&self, arguments: &[IValue]) -> Result<Vec<IValue>, ()> {
+    fn call(&self, arguments: &[IValue]) -> std::result::Result<Vec<IValue>, ()> {
         use super::type_converters::{ival_to_wval, wval_to_ival};
 
         match &self.inner {

engine/src/module/wit_instance.rs

@@ -16,6 +16,7 @@
 
 use super::wit_prelude::*;
 use super::fce_module::FCEModule;
+use crate::Result;
 
 use fce_wit_interfaces::FCEWITInterfaces;
 use fce_wit_interfaces::WITAstType;
@@ -37,7 +38,7 @@ impl WITInstance {
         wasmer_instance: &WasmerInstance,
         wit: &FCEWITInterfaces<'_>,
         modules: &HashMap<String, FCEModule>,
-    ) -> Result<Self, FCEError> {
+    ) -> Result<Self> {
         let mut exports = Self::extract_raw_exports(&wasmer_instance, wit)?;
         let imports = Self::extract_imports(modules, wit, exports.len())?;
         let memories = Self::extract_memories(&wasmer_instance);
@@ -51,7 +52,7 @@ impl WITInstance {
     fn extract_raw_exports(
         wasmer_instance: &WasmerInstance,
         wit: &FCEWITInterfaces<'_>,
-    ) -> Result<HashMap<usize, WITFunction>, FCEError> {
+    ) -> Result<HashMap<usize, WITFunction>> {
         use wasmer_core::DynFunc;
 
         let module_exports = &wasmer_instance.exports;
@@ -76,7 +77,7 @@ impl WITInstance {
         modules: &HashMap<String, FCEModule>,
         wit: &FCEWITInterfaces<'_>,
         start_index: usize,
-    ) -> Result<HashMap<usize, WITFunction>, FCEError> {
+    ) -> Result<HashMap<usize, WITFunction>> {
         wit.imports()
             .filter(|import|
                 // filter out imports that have implementations
@@ -89,7 +90,7 @@ impl WITInstance {
                 }
                 None => Err(FCEError::NoSuchModule(import.namespace.to_string())),
             })
-            .collect::<Result<HashMap<_, _>, _>>()
+            .collect::<Result<HashMap<_, _>>>()
     }
 
     fn extract_memories(wasmer_instance: &WasmerInstance) -> Vec<WITMemory> {

fluence-faas/src/faas.rs

@@ -106,7 +106,16 @@ impl FluenceFaaS {
     }
 
     /// Executes provided Wasm code in the internal environment (with access to module exports).
-    pub fn call_code(
+    pub fn call_code<S: AsRef<str>>(
+        &mut self,
+        wasm: &[u8],
+        func_name: S,
+        args: &[IValue],
+    ) -> Result<Vec<IValue>> {
+        self.call_code_(wasm, func_name.as_ref(), args)
+    }
+
+    pub fn call_code_(
         &mut self,
         wasm: &[u8],
         func_name: &str,
@@ -125,10 +134,10 @@ impl FluenceFaaS {
     }
 
     /// Call a specified function of loaded on a startup module by its name.
-    pub fn call_module(
+    pub fn call_module<MN: AsRef<str>, FN: AsRef<str>>(
         &mut self,
-        module_name: &str,
-        func_name: &str,
+        module_name: MN,
+        func_name: FN,
         args: &[IValue],
     ) -> Result<Vec<IValue>> {
         self.fce

fluence-faas/src/misc/utils.rs

@@ -14,20 +14,19 @@
  * limitations under the License.
  */
 
-use wasmer_core::vm::Ctx;
-use crate::FaaSError;
 use super::config::ModuleConfig;
 
 use fce::FCEModuleConfig;
 
+use wasmer_core::backend::SigRegistry;
+use wasmer_core::module::ExportIndex;
+use wasmer_core::vm::Ctx;
 use wasmer_core::import::ImportObject;
-use wasmer_runtime::func;
 use wasmer_core::typed_func::WasmTypeList;
+use wasmer_runtime::func;
 use wasmer_runtime::Func;
 use wasmer_runtime::error::ResolveError;
-use wasmer_core::backend::SigRegistry;
 use wasmer_runtime::types::LocalOrImport;
-use wasmer_core::module::ExportIndex;
 
 use std::path::PathBuf;
 
@@ -103,7 +102,7 @@ where
 }
 
 /// Make FCE config based on parsed raw config.
-pub(crate) fn make_fce_config(config: Option<ModuleConfig>) -> Result<FCEModuleConfig, FaaSError> {
+pub(crate) fn make_fce_config(config: Option<ModuleConfig>) -> crate::Result<FCEModuleConfig> {
     use super::imports::create_host_import_func;
     use super::imports::log_utf8_string;
     use wasmer_core::import::Namespace;