feat: Support generics on messages attribute in main contract macro

call

sylvia-derive/src/interfaces.rs

@@ -15,13 +15,6 @@ pub struct Interfaces {
 }
 
 impl Interfaces {
-    fn merge_module_with_name(message_attr: &ContractMessageAttr, name: &syn::Ident) -> syn::Ident {
-        // ContractMessageAttr will fail to parse empty `#[messsages()]` attribute so we can safely unwrap here
-        let syn::PathSegment { ident, .. } = &message_attr.module.segments.last().unwrap();
-        let module_name = ident.to_string().to_case(Case::UpperCamel);
-        syn::Ident::new(&format!("{}{}", module_name, name), name.span())
-    }
-
     pub fn new(source: &ItemImpl) -> Self {
         let interfaces: Vec<_> = source
             .attrs
@@ -90,11 +83,19 @@ impl Interfaces {
             .iter()
             .map(|interface| {
                 let ContractMessageAttr {
-                    module, variant, ..
+                    module,
+                    variant,
+                    generics,
+                    ..
                 } = interface;
+                let generics = if !generics.is_empty() {
+                    quote! { < #generics > }
+                } else {
+                    quote! {}
+                };
 
                 let interface_enum =
-                    quote! { <#module ::InterfaceTypes as #sylvia ::types::InterfaceMessages> };
+                    quote! { <#module ::InterfaceTypes #generics as #sylvia ::types::InterfaceMessages> };
                 if msg_ty == &MsgType::Query {
                     quote! { #variant ( #interface_enum :: Query) }
                 } else {
@@ -104,28 +105,46 @@ impl Interfaces {
             .collect()
     }
 
-    pub fn emit_messages_call(&self, msg_name: &Ident) -> Vec<TokenStream> {
+    pub fn emit_messages_call(&self, msg_ty: &MsgType) -> Vec<TokenStream> {
+        let sylvia = crate_module();
+
         self.interfaces
             .iter()
             .map(|interface| {
-                let enum_name = Self::merge_module_with_name(interface, msg_name);
-                let module = &interface.module;
-                quote! { &#module :: #enum_name :: messages()}
+                let ContractMessageAttr {
+                    module, generics, ..
+                } = interface;
+                let generics = if !generics.is_empty() {
+                    quote! { < #generics > }
+                } else {
+                    quote! {}
+                };
+                let type_name = msg_ty.as_accessor_name();
+                quote! {
+                    &<#module :: InterfaceTypes #generics as #sylvia ::types::InterfaceMessages> :: #type_name :: messages()
+                }
             })
             .collect()
     }
 
-    pub fn emit_deserialization_attempts(&self, msg_name: &Ident) -> Vec<TokenStream> {
+    pub fn emit_deserialization_attempts(&self, msg_ty: &MsgType) -> Vec<TokenStream> {
+        let sylvia = crate_module();
+
         self.interfaces
             .iter()
             .map(|interface| {
                 let ContractMessageAttr {
-                    module, variant, ..
+                    module, variant, generics, ..
                 } = interface;
-                let enum_name = Self::merge_module_with_name(interface, msg_name);
+                let generics = if !generics.is_empty() {
+                    quote! { < #generics > }
+                } else {
+                    quote! {}
+                };
 
+                let type_name = msg_ty.as_accessor_name();
                 quote! {
-                    let msgs = &#module :: #enum_name ::messages();
+                    let msgs = &<#module :: InterfaceTypes #generics as #sylvia ::types::InterfaceMessages> :: #type_name :: messages();
                     if msgs.into_iter().any(|msg| msg == &recv_msg_name) {
                         match val.deserialize_into() {
                             Ok(msg) => return Ok(Self:: #variant (msg)),
@@ -137,13 +156,26 @@ impl Interfaces {
             .collect()
     }
 
-    pub fn emit_response_schemas_calls(&self, msg_name: &Ident) -> Vec<TokenStream> {
+    pub fn emit_response_schemas_calls(&self, msg_ty: &MsgType) -> Vec<TokenStream> {
+        let sylvia = crate_module();
+
         self.interfaces
             .iter()
             .map(|interface| {
-                let enum_name = Self::merge_module_with_name(interface, msg_name);
-                let module = &interface.module;
-                quote! { #module :: #enum_name :: response_schemas_impl()}
+                let ContractMessageAttr {
+                    module, generics, ..
+                } = interface;
+
+                let generics = if !generics.is_empty() {
+                    quote! { < #generics > }
+                } else {
+                    quote! {}
+                };
+
+                let type_name = msg_ty.as_accessor_name();
+                quote! {
+                    <#module :: InterfaceTypes #generics as #sylvia ::types::InterfaceMessages> :: #type_name :: response_schemas_impl()
+                }
             })
             .collect()
     }

sylvia-derive/src/message.rs

@@ -968,7 +968,7 @@ impl<'a> GlueMessage<'a> {
 
         let msg_name = quote! {#contract ( #name)};
         let mut messages_call_on_all_variants: Vec<TokenStream> =
-            interfaces.emit_messages_call(name);
+            interfaces.emit_messages_call(msg_ty);
         messages_call_on_all_variants.push(quote! {&#name :: messages()});
 
         let variants_cnt = messages_call_on_all_variants.len();
@@ -1002,7 +1002,7 @@ impl<'a> GlueMessage<'a> {
 
         let dispatch_arm = quote! {#enum_name :: #contract (msg) => msg.dispatch(contract, ctx)};
 
-        let interfaces_deserialization_attempts = interfaces.emit_deserialization_attempts(name);
+        let interfaces_deserialization_attempts = interfaces.emit_deserialization_attempts(msg_ty);
 
         #[cfg(not(tarpaulin_include))]
         let contract_deserialization_attempt = quote! {
@@ -1018,7 +1018,7 @@ impl<'a> GlueMessage<'a> {
         let ctx_type = msg_ty.emit_ctx_type(&custom.query_or_default());
         let ret_type = msg_ty.emit_result_type(&custom.msg_or_default(), error);
 
-        let mut response_schemas_calls = interfaces.emit_response_schemas_calls(name);
+        let mut response_schemas_calls = interfaces.emit_response_schemas_calls(msg_ty);
         response_schemas_calls.push(quote! {#name :: response_schemas_impl()});
 
         let response_schemas = match name.to_string().as_str() {

sylvia-derive/src/parser.rs

@@ -1,14 +1,17 @@
 use proc_macro2::{Punct, TokenStream};
 use proc_macro_error::emit_error;
 use quote::quote;
+use syn::fold::Fold;
 use syn::parse::{Error, Nothing, Parse, ParseBuffer, ParseStream, Parser};
+use syn::punctuated::Punctuated;
 use syn::spanned::Spanned;
 use syn::{
-    parenthesized, parse_quote, Attribute, Ident, ImplItem, ImplItemMethod, ItemImpl, ItemTrait,
-    Path, Result, Token, TraitItem, Type,
+    parenthesized, parse_quote, Attribute, GenericArgument, Ident, ImplItem, ImplItemMethod,
+    ItemImpl, ItemTrait, Path, PathArguments, Result, Token, TraitItem, Type,
 };
 
 use crate::crate_module;
+use crate::strip_generics::StripGenerics;
 
 /// Parser arguments for `contract` macro
 pub struct ContractArgs {
@@ -248,6 +251,7 @@ pub struct ContractMessageAttr {
     pub module: Path,
     pub variant: Ident,
     pub customs: Customs,
+    pub generics: Punctuated<GenericArgument, Token![,]>,
 }
 
 fn interface_has_custom(content: ParseStream) -> Result<Customs> {
@@ -285,14 +289,36 @@ fn interface_has_custom(content: ParseStream) -> Result<Customs> {
     Ok(customs)
 }
 
+fn extract_generics_from_path(module: &mut Path) -> Punctuated<GenericArgument, Token![,]> {
+    let generics = module.segments.last().map(|segment| {
+        match segment.arguments.clone(){
+            PathArguments::AngleBracketed(generics) => {
+                generics.args
+            },
+            PathArguments::None => Default::default(),
+            PathArguments::Parenthesized(generics) => {
+                emit_error!(
+                    generics.span(), "Found paranthesis wrapping generics in `messages` attribute.";
+                    note = "Expected `messages` attribute to be in form `#[messages(Path<generics> as Type)]`"
+                );
+               Default::default()
+            }
+        }
+    }).unwrap_or_default();
+
+    generics
+}
+
 #[cfg(not(tarpaulin_include))]
 // False negative. It is being called in closure
 impl Parse for ContractMessageAttr {
     fn parse(input: ParseStream) -> Result<Self> {
         let content;
         parenthesized!(content in input);
 
-        let module = content.parse()?;
+        let mut module = content.parse()?;
+        let generics = extract_generics_from_path(&mut module);
+        let module = StripGenerics.fold_path(module);
 
         let _: Token![as] = content.parse()?;
         let variant = content.parse()?;
@@ -310,6 +336,7 @@ impl Parse for ContractMessageAttr {
             module,
             variant,
             customs,
+            generics,
         })
     }
 }
@@ -474,6 +501,7 @@ impl OverrideEntryPoint {
             entry_point,
             msg_name,
             msg_type,
+            ..
         } = self;
 
         let sylvia = crate_module();

sylvia/tests/generics.rs

@@ -34,16 +34,21 @@ pub mod cw1_contract {
     use sylvia::types::InstantiateCtx;
     use sylvia_derive::contract;
 
+    use crate::{ExternalMsg, ExternalQuery};
+
     pub struct Cw1Contract;
 
     #[contract]
+    #[messages(crate::cw1<ExternalMsg, ExternalMsg, ExternalQuery> as Cw1)]
+    /// Required if interface returns generic `Response`
+    #[sv::custom(msg=ExternalMsg)]
     impl Cw1Contract {
         pub const fn new() -> Self {
             Self
         }
 
         #[msg(instantiate)]
-        pub fn instantiate(&self, _ctx: InstantiateCtx) -> StdResult<Response> {
+        pub fn instantiate(&self, _ctx: InstantiateCtx) -> StdResult<Response<ExternalMsg>> {
             Ok(Response::new())
         }
     }
@@ -91,12 +96,11 @@ impl cosmwasm_std::CustomQuery for ExternalQuery {}
 
 #[cfg(all(test, feature = "mt"))]
 mod tests {
+    use crate::cw1::{InterfaceTypes, Querier as Cw1Querier};
+    use crate::{ExternalMsg, ExternalQuery};
     use cosmwasm_std::{testing::mock_dependencies, Addr, CosmosMsg, Empty, QuerierWrapper};
-
-    use crate::{cw1::Querier, ExternalMsg, ExternalQuery};
-
-    use crate::cw1::InterfaceTypes;
     use sylvia::types::InterfaceMessages;
+
     #[test]
     fn construct_messages() {
         let contract = Addr::unchecked("contract");
@@ -110,9 +114,13 @@ mod tests {
         let querier: QuerierWrapper<ExternalQuery> = QuerierWrapper::new(&deps.querier);
 
         let cw1_querier = crate::cw1::BoundQuerier::borrowed(&contract, &querier);
-        let _: Result<ExternalQuery, _> = Querier::some_query(&cw1_querier, ExternalMsg {});
+        let _: Result<ExternalQuery, _> =
+            crate::cw1::Querier::some_query(&cw1_querier, ExternalMsg {});
         let _: Result<ExternalQuery, _> = cw1_querier.some_query(ExternalMsg {});
 
+        let contract_querier = crate::cw1_contract::BoundQuerier::borrowed(&contract, &querier);
+        let _: Result<ExternalQuery, _> = contract_querier.some_query(ExternalMsg {});
+
         // Construct messages with Interface extension
         let _ =
             <InterfaceTypes<ExternalMsg, _, ExternalQuery> as InterfaceMessages>::Query::some_query(