Macros for frontend nRPC service generation

Cargo.toml

@@ -1,13 +1,14 @@
-[package]
-name = "usdpl"
-version = "0.10.0"
-authors = ["NGnius (Graham) <ngniusness@gmail.com>"]
-edition = "2021"
-license = "GPL-3.0-only"
-repository = "https://github.com/NGnius/usdpl-rs"
-readme = "README.md"
+[workspace]
+members = [
+    "usdpl-core",
+    "usdpl-front",
+    "usdpl-back",
+    "usdpl-build",
+]
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+exclude = [
+    "templates/decky/backend"
+]
 
 [profile.release]
 # Tell `rustc` to optimize for small code size.
@@ -16,14 +17,3 @@ debug = false
 strip = true
 lto = true
 codegen-units = 4
-
-[workspace]
-members = [
-    "usdpl-core",
-    "usdpl-front",
-    "usdpl-back",
-]
-
-exclude = [
-    "templates/decky/backend"
-]

usdpl-back/Cargo.toml

@@ -1,25 +1,26 @@
 [package]
 name = "usdpl-back"
-version = "0.10.1"
+version = "0.11.0"
 edition = "2021"
 license = "GPL-3.0-only"
 repository = "https://github.com/NGnius/usdpl-rs"
-readme = "README.md"
+readme = "../README.md"
 description = "Universal Steam Deck Plugin Library back-end"
 
 [features]
-default = ["blocking", "translate"]
+default = ["blocking"]
 decky = ["usdpl-core/decky"]
-crankshaft = ["usdpl-core/crankshaft"]
 blocking = ["tokio", "tokio/rt", "tokio/rt-multi-thread"] # synchronous API for async functionality, using tokio
 encrypt = ["usdpl-core/encrypt", "obfstr", "hex"]
-translate = ["usdpl-core/translate", "gettext-ng"]
 
 [dependencies]
-usdpl-core = { version = "0.10", path = "../usdpl-core"}
+usdpl-core = { version = "0.11", path = "../usdpl-core"}
 
 log = "0.4"
 
+# gRPC/protobuf
+nrpc = "0.2"
+
 # HTTP web framework
 warp = { version = "0.3" }
 bytes = { version = "1.1" }
@@ -34,4 +35,7 @@ obfstr = { version = "0.3", optional = true }
 hex = { version = "0.4", optional = true }
 
 # translations
-gettext-ng = { version = "0.4.1", optional = true }
+gettext-ng = { version = "0.4.1" }
+
+[build-dependencies]
+usdpl-build = { version = "0.11", path = "../usdpl-build" }

usdpl-back/build.rs

@@ -0,0 +1,3 @@
+fn main() {
+    usdpl_build::back::build()
+}

usdpl-back/src/api_common/dirs.rs

@@ -6,8 +6,6 @@ use std::path::PathBuf;
 pub fn home() -> Option<PathBuf> {
     #[cfg(not(any(feature = "decky", feature = "crankshaft")))]
     let result = crate::api_any::dirs::home();
-    #[cfg(all(feature = "crankshaft", not(any(feature = "decky"))))]
-    let result = None; // TODO
     #[cfg(all(feature = "decky", not(any(feature = "crankshaft"))))]
     let result = crate::api_decky::home().ok()
         .map(|x| PathBuf::from(x)
@@ -23,8 +21,6 @@ pub fn home() -> Option<PathBuf> {
 pub fn plugin() -> Option<PathBuf> {
     #[cfg(not(any(feature = "decky", feature = "crankshaft")))]
     let result = None; // TODO
-    #[cfg(all(feature = "crankshaft", not(any(feature = "decky"))))]
-    let result = None; // TODO
     #[cfg(all(feature = "decky", not(any(feature = "crankshaft"))))]
     let result = crate::api_decky::plugin_dir().ok().map(|x| x.into());
 
@@ -35,8 +31,6 @@ pub fn plugin() -> Option<PathBuf> {
 pub fn log() -> Option<PathBuf> {
     #[cfg(not(any(feature = "decky", feature = "crankshaft")))]
     let result = crate::api_any::dirs::log();
-    #[cfg(all(feature = "crankshaft", not(any(feature = "decky"))))]
-    let result = None; // TODO
     #[cfg(all(feature = "decky", not(any(feature = "crankshaft"))))]
     let result = crate::api_decky::log_dir().ok().map(|x| x.into());
 

usdpl-back/src/api_crankshaft/mod.rs

@@ -1 +0,0 @@
-compile_error!("Crankshaft unsupported (project no longer maintained)");

usdpl-build/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "usdpl-build"
+version = "0.11.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+nrpc-build = "0.5"
+prost-build = "0.11"
+prost-types = "0.11"
+
+# code gen
+prettyplease = "0.2"
+quote = "1.0"
+syn = "2.0"
+proc-macro2 = "1.0"
+

usdpl-build/protos/debug.proto

@@ -0,0 +1,25 @@
+syntax = "proto3";
+
+package usdpl;
+
+// The translation service
+service DevTools {
+  // Retrieves all translations for the provided 4-letter code
+  rpc Log (LogMessage) returns (Empty);
+}
+
+enum LogLevel {
+    Trace = 0;
+    Debug = 1;
+    Info = 2;
+    Warn = 3;
+    Error = 4;
+}
+
+// The request message containing the log message
+message LogMessage {
+  LogLevel level = 1;
+  string msg = 2;
+}
+
+message Empty {}

usdpl-build/protos/translations.proto

@@ -0,0 +1,19 @@
+syntax = "proto3";
+
+package usdpl;
+
+// The translation service
+service Translations {
+  // Retrieves all translations for the provided 4-letter code
+  rpc GetLanguage (LanguageRequest) returns (TranslationsReply) {}
+}
+
+// The request message containing the language code
+message LanguageRequest {
+  string lang = 1;
+}
+
+// The response message containing all translations for the language
+message TranslationsReply {
+  map<string, string> translations = 1;
+}

usdpl-build/src/back/mod.rs

@@ -0,0 +1,7 @@
+pub fn build() {
+    crate::dump_protos_out().unwrap();
+    nrpc_build::compile_servers(
+        crate::all_proto_filenames().map(|n| crate::proto_out_path().clone().join(n)),
+        [crate::proto_out_path()]
+    )
+}

usdpl-build/src/front/mod.rs

@@ -0,0 +1,22 @@
+mod preprocessor;
+pub use preprocessor::WasmProtoPreprocessor;
+
+mod service_generator;
+pub use service_generator::WasmServiceGenerator;
+
+mod shared_state;
+pub(crate) use shared_state::SharedState;
+
+pub fn build() {
+    let shared_state = SharedState::new();
+    crate::dump_protos_out().unwrap();
+    nrpc_build::Transpiler::new(
+        crate::all_proto_filenames().map(|n| crate::proto_out_path().clone().join(n)),
+        [crate::proto_out_path()]
+    ).unwrap()
+        .generate_client()
+        .with_preprocessor(nrpc_build::AbstractImpl::outer(WasmProtoPreprocessor::with_state(&shared_state)))
+        .with_service_generator(nrpc_build::AbstractImpl::outer(WasmServiceGenerator::with_state(&shared_state)))
+        .transpile()
+        .unwrap()
+}

usdpl-build/src/front/preprocessor.rs

@@ -0,0 +1,27 @@
+use nrpc_build::IPreprocessor;
+//use prost_build::{Service, ServiceGenerator};
+use prost_types::FileDescriptorSet;
+
+use super::SharedState;
+
+pub struct WasmProtoPreprocessor {
+    shared: SharedState,
+}
+
+impl WasmProtoPreprocessor {
+    pub fn with_state(state: &SharedState) -> Self {
+        Self {
+            shared: state.clone(),
+        }
+    }
+}
+
+impl IPreprocessor for WasmProtoPreprocessor {
+    fn process(&mut self, fds: &mut FileDescriptorSet) -> proc_macro2::TokenStream {
+        self.shared.lock()
+            .expect("Cannot lock shared state")
+            .fds = Some(fds.clone());
+        quote::quote!{}
+    }
+}
+

usdpl-build/src/front/service_generator.rs

@@ -0,0 +1,592 @@
+use std::collections::HashSet;
+
+use prost_build::Service;
+use prost_types::{FileDescriptorSet, DescriptorProto, EnumDescriptorProto, FieldDescriptorProto};
+use nrpc_build::IServiceGenerator;
+
+use super::SharedState;
+
+pub struct WasmServiceGenerator {
+    shared: SharedState,
+}
+
+impl WasmServiceGenerator {
+    pub fn with_state(state: &SharedState) -> Self {
+        Self {
+            shared: state.clone(),
+        }
+    }
+}
+
+fn generate_service_methods(service: &Service, fds: &FileDescriptorSet) -> proc_macro2::TokenStream {
+    let mut gen_methods = Vec::with_capacity(service.methods.len());
+    for method in &service.methods {
+        let method_name = quote::format_ident!("{}", method.name);
+        let method_input = quote::format_ident!("{}{}", &service.name, method.input_type);
+        let method_output = quote::format_ident!("{}{}", &service.name, method.output_type);
+
+        let input_type = find_message_type(&method.input_type, &service.package, fds).expect("Protobuf message is used but not found");
+
+        let mut input_params = Vec::with_capacity(input_type.field.len());
+        let mut params_to_fields = Vec::with_capacity(input_type.field.len());
+        for field in &input_type.field {
+            //let param_name = quote::format_ident!("val{}", i.to_string());
+            let type_name = translate_type(field, &service.name);
+            let field_name = quote::format_ident!("{}", field.name.as_ref().expect("Protobuf message field needs a name"));
+            input_params.push(quote::quote!{
+                #field_name: #type_name,
+            });
+            params_to_fields.push(quote::quote!{
+                #field_name,//: #field_name,
+            });
+        }
+        let params_to_fields_transformer = if input_type.field.len() == 1 {
+            let field_name = quote::format_ident!("{}", input_type.field[0].name.as_ref().expect("Protobuf message field needs a name"));
+            quote::quote!{
+                let val = #field_name;
+            }
+        } else if input_type.field.is_empty() {
+            quote::quote!{
+                let val = #method_input {};
+            }
+        } else {
+            quote::quote!{
+                let val = #method_input {
+                    #(#params_to_fields)*
+                };
+            }
+        };
+
+        let special_fn_into_input = quote::format_ident!("{}_convert_into", method.input_type.split('.').last().unwrap().to_lowercase());
+
+        let special_fn_from_output = quote::format_ident!("{}_convert_from", method.output_type.split('.').last().unwrap().to_lowercase());
+
+        gen_methods.push(
+            quote::quote!{
+                #[wasm_bindgen]
+                pub async fn #method_name(&mut self, #(#input_params)*) -> Option<#method_output> {
+
+                    #params_to_fields_transformer
+
+                    match self.service.#method_name(#special_fn_into_input(val)).await {
+                        Ok(x) => Some(#special_fn_from_output(x)),
+                        Err(_e) => {
+                            // TODO log error
+                            None
+                        }
+                    }
+                }
+            }
+        );
+    }
+    quote::quote!{
+        #(#gen_methods)*
+    }
+}
+
+fn find_message_type<'a>(want_type: &str, want_package: &str, fds: &'a FileDescriptorSet) -> Option<&'a DescriptorProto> {
+    for file in &fds.file {
+        for message_type in &file.message_type {
+            if let Some(name) = &message_type.name {
+                if let Some(pkg) = &file.package {
+                    if name == want_type && pkg == want_package {
+                        return Some(message_type);
+                    }
+                }
+            }
+        }
+    }
+    None
+}
+
+fn find_enum_type<'a>(want_type: &str, want_package: &str, fds: &'a FileDescriptorSet) -> Option<&'a EnumDescriptorProto> {
+    for file in &fds.file {
+        for enum_type in &file.enum_type {
+            if let Some(name) = &enum_type.name {
+                if let Some(pkg) = &file.package {
+                    if name == want_type && pkg == want_package {
+                        return Some(enum_type);
+                    }
+                }
+            }
+        }
+    }
+    None
+}
+
+fn find_field<'a>(want_field: &str, descriptor: &'a DescriptorProto) -> Option<&'a FieldDescriptorProto> {
+    for field in &descriptor.field {
+        if let Some(name) = &field.name {
+            if name == want_field {
+                return Some(field);
+            }
+        }
+    }
+    None
+}
+
+fn translate_type(field: &FieldDescriptorProto, service: &str) -> proc_macro2::TokenStream {
+    if let Some(type_name) = &field.type_name {
+        translate_type_name(type_name, service)
+    } else {
+        let number = field.r#type.unwrap();
+        translate_type_known(number)
+    }
+}
+
+fn generate_wasm_struct_interop(descriptor: &DescriptorProto, handled_enums: &mut HashSet<String>, handled_types: &mut HashSet<String>, is_response_msg: bool, service: &str) -> proc_macro2::TokenStream {
+    let msg_name = quote::format_ident!("{}{}", service, descriptor.name.as_ref().expect("Protobuf message needs a name"));
+    let super_msg_name = quote::format_ident!("{}", descriptor.name.as_ref().expect("Protobuf message needs a name"));
+    let mut gen_fields = Vec::with_capacity(descriptor.field.len());
+    let mut gen_into_fields = Vec::with_capacity(descriptor.field.len());
+    let mut gen_from_fields = Vec::with_capacity(descriptor.field.len());
+
+    let mut gen_nested_types = Vec::with_capacity(descriptor.nested_type.len());
+
+    let mut gen_enums = Vec::with_capacity(descriptor.enum_type.len());
+
+    if let Some(options) = &descriptor.options {
+        if let Some(map_entry) = options.map_entry {
+            // TODO deal with options when necessary
+            if map_entry {
+                let name = descriptor.name.clone().expect("Protobuf message needs a name");
+                let special_fn_from = quote::format_ident!("{}_convert_from", name.split('.').last().unwrap().to_lowercase());
+                let special_fn_into = quote::format_ident!("{}_convert_into", name.split('.').last().unwrap().to_lowercase());
+                let key_field = find_field("key", descriptor).expect("Protobuf map entry has no key field");
+                let key_type = translate_type(&key_field, service);
+                let value_field = find_field("value", descriptor).expect("Protobuf map entry has no value field");
+                let value_type = translate_type(&value_field, service);
+                return quote::quote!{
+                    pub type #msg_name = ::js_sys::Map;
+
+                    #[inline]
+                    #[allow(dead_code)]
+                    fn #special_fn_from(other: ::std::collections::HashMap<#key_type, #value_type>) -> #msg_name {
+                        let map = #msg_name::new();
+                        for (key, val) in other.iter() {
+                            map.set(&key.into(), &val.into());
+                        }
+                        map
+                    }
+
+                    #[inline]
+                    #[allow(dead_code)]
+                    fn #special_fn_into(this: #msg_name) -> ::std::collections::HashMap<#key_type, #value_type> {
+                        let mut output = ::std::collections::HashMap::<#key_type, #value_type>::new();
+                        this.for_each(&mut |key: ::wasm_bindgen::JsValue, val: ::wasm_bindgen::JsValue| {
+                            if let Some(key) = key.as_string() {
+                                if let Some(val) = val.as_string() {
+                                    output.insert(key, val);
+                                }
+                            }
+                        });
+                        output
+                    }
+                }
+            }
+        } else {
+            todo!("Deal with message options when necessary");
+        }
+    }
+
+    for n_type in &descriptor.nested_type {
+        let type_name = n_type.name.clone().expect("Protobuf nested message needs a name");
+        if !handled_types.contains(&type_name) {
+            handled_types.insert(type_name);
+            gen_nested_types.push(generate_wasm_struct_interop(n_type, handled_enums, handled_types, is_response_msg, service));
+        }
+    }
+
+    for e_type in &descriptor.enum_type {
+        let type_name = e_type.name.clone().expect("Protobuf enum needs a name");
+        if !handled_enums.contains(&type_name) {
+            handled_enums.insert(type_name);
+            gen_enums.push(generate_wasm_enum_interop(e_type, service));
+        }
+    }
+    if descriptor.field.len() == 1 {
+        let field = &descriptor.field[0];
+        let field_name = quote::format_ident!("{}", field.name.as_ref().expect("Protobuf message field needs a name"));
+        let type_name = translate_type(field, service);
+        gen_fields.push(quote::quote!{
+            pub #field_name: #type_name,
+        });
+        if let Some(name) = &field.type_name {
+            let special_fn_from = quote::format_ident!("{}_convert_from", name.split('.').last().unwrap().to_lowercase());
+            let special_fn_into = quote::format_ident!("{}_convert_into", name.split('.').last().unwrap().to_lowercase());
+            gen_into_fields.push(
+                quote::quote!{
+                    #field_name: #special_fn_into(this)
+                }
+            );
+
+            gen_from_fields.push(
+                quote::quote!{
+                    #special_fn_from(other.#field_name)
+                }
+            );
+        } else {
+            gen_into_fields.push(
+                quote::quote!{
+                    #field_name: this
+                }
+            );
+
+            gen_from_fields.push(
+                quote::quote!{
+                    other.#field_name
+                }
+            );
+        }
+
+        let name = descriptor.name.clone().expect("Protobuf message needs a name");
+        let special_fn_from = quote::format_ident!("{}_convert_from", name.split('.').last().unwrap().to_lowercase());
+        let special_fn_into = quote::format_ident!("{}_convert_into", name.split('.').last().unwrap().to_lowercase());
+
+        quote::quote!{
+            pub type #msg_name = #type_name;
+
+            #[inline]
+            #[allow(dead_code)]
+            fn #special_fn_from(other: super::#super_msg_name) -> #msg_name {
+                #(#gen_from_fields)*
+            }
+
+            #[inline]
+            #[allow(dead_code)]
+            fn #special_fn_into(this: #msg_name) -> super::#super_msg_name {
+                super::#super_msg_name {
+                    #(#gen_into_fields)*
+                }
+            }
+
+            #(#gen_nested_types)*
+
+            #(#gen_enums)*
+        }
+    } else {
+        for field in &descriptor.field {
+            let field_name = quote::format_ident!("{}", field.name.as_ref().expect("Protobuf message field needs a name"));
+            let type_name = translate_type(field, service);
+            gen_fields.push(quote::quote!{
+                pub #field_name: #type_name,
+            });
+            if let Some(name) = &field.type_name {
+                let special_fn_from = quote::format_ident!("{}_convert_from", name.split('.').last().unwrap().to_lowercase());
+                let special_fn_into = quote::format_ident!("{}_convert_into", name.split('.').last().unwrap().to_lowercase());
+                gen_into_fields.push(
+                    quote::quote!{
+                        #field_name: #special_fn_into(self.#field_name),
+                    }
+                );
+
+                gen_from_fields.push(
+                    quote::quote!{
+                        #field_name: #special_fn_from(other.#field_name),
+                    }
+                );
+            } else {
+                gen_into_fields.push(
+                    quote::quote!{
+                        #field_name: self.#field_name,
+                    }
+                );
+
+                gen_from_fields.push(
+                    quote::quote!{
+                        #field_name: other.#field_name,
+                    }
+                );
+            }
+        }
+
+        let name = descriptor.name.clone().expect("Protobuf message needs a name");
+        let special_fn_from = quote::format_ident!("{}_convert_from", name.split('.').last().unwrap().to_lowercase());
+        let special_fn_into = quote::format_ident!("{}_convert_into", name.split('.').last().unwrap().to_lowercase());
+
+        let wasm_attribute_maybe = if descriptor.field.len() == 1 || !is_response_msg {
+            quote::quote!{}
+        } else {
+            quote::quote!{
+                #[wasm_bindgen]
+            }
+        };
+
+        quote::quote!{
+            #wasm_attribute_maybe
+            pub struct #msg_name {
+                #(#gen_fields)*
+            }
+
+            impl std::convert::Into<super::#super_msg_name> for #msg_name {
+                #[inline]
+                fn into(self) -> super::#super_msg_name {
+                    super::#super_msg_name {
+                        #(#gen_into_fields)*
+                    }
+                }
+            }
+
+            impl std::convert::From<super::#super_msg_name> for #msg_name {
+                #[inline]
+                #[allow(unused_variables)]
+                fn from(other: super::#super_msg_name) -> Self {
+                    #msg_name {
+                        #(#gen_from_fields)*
+                    }
+                }
+            }
+
+            #[inline]
+            #[allow(dead_code)]
+            fn #special_fn_from(other: super::#super_msg_name) -> #msg_name {
+                #msg_name::from(other)
+            }
+
+            #[inline]
+            #[allow(dead_code)]
+            fn #special_fn_into(this: #msg_name) -> super::#super_msg_name {
+                this.into()
+            }
+
+            #(#gen_nested_types)*
+
+            #(#gen_enums)*
+        }
+    }
+
+}
+
+fn translate_type_name(name: &str, service: &str) -> proc_macro2::TokenStream {
+    match name {
+        "double" => quote::quote!{f64},
+        "float" => quote::quote!{f32},
+        "int32" => quote::quote!{i32},
+        "int64" => quote::quote!{i64},
+        "uint32" => quote::quote!{u32},
+        "uint64" => quote::quote!{u64},
+        "sint32" => quote::quote!{i32},
+        "sint64" => quote::quote!{i64},
+        "fixed32" => quote::quote!{u32},
+        "fixed64" => quote::quote!{u64},
+        "sfixed32" => quote::quote!{i32},
+        "sfixed64" => quote::quote!{i64},
+        "bool" => quote::quote!{bool},
+        "string" => quote::quote!{String},
+        "bytes" => quote::quote!{Vec<u8>},
+        t => {
+            let ident = quote::format_ident!("{}{}", service, t.split('.').last().unwrap());
+            quote::quote!{#ident}
+        },
+    }
+}
+
+fn translate_type_known(id: i32) -> proc_macro2::TokenStream {
+    match id {
+        //"double" => quote::quote!{f64},
+        //"float" => quote::quote!{f32},
+        //"int32" => quote::quote!{i32},
+        //"int64" => quote::quote!{i64},
+        //"uint32" => quote::quote!{u32},
+        //"uint64" => quote::quote!{u64},
+        //"sint32" => quote::quote!{i32},
+        //"sint64" => quote::quote!{i64},
+        //"fixed32" => quote::quote!{u32},
+        //"fixed64" => quote::quote!{u64},
+        //"sfixed32" => quote::quote!{i32},
+        //"sfixed64" => quote::quote!{i64},
+        //"bool" => quote::quote!{bool},
+        9 => quote::quote!{String},
+        //"bytes" => quote::quote!{Vec<u8>},
+        t => {
+            let ident = quote::format_ident!("UnknownType{}", t.to_string());
+            quote::quote!{#ident}
+        },
+    }
+}
+
+fn generate_wasm_enum_interop(descriptor: &EnumDescriptorProto, service: &str) -> proc_macro2::TokenStream {
+    let enum_name = quote::format_ident!("{}{}", service, descriptor.name.as_ref().expect("Protobuf enum needs a name"));
+    let super_enum_name = quote::format_ident!("{}", descriptor.name.as_ref().expect("Protobuf enum needs a name"));
+    let mut gen_values = Vec::with_capacity(descriptor.value.len());
+    let mut gen_into_values = Vec::with_capacity(descriptor.value.len());
+    let mut gen_from_values = Vec::with_capacity(descriptor.value.len());
+    if let Some(_options) = &descriptor.options {
+        // TODO deal with options when necessary
+        todo!("Deal with enum options when necessary");
+    }
+    for value in &descriptor.value {
+        let val_name = quote::format_ident!("{}", value.name.as_ref().expect("Protobuf enum value needs a name"));
+        if let Some(_val_options) = &value.options {
+            // TODO deal with options when necessary
+            todo!("Deal with enum value options when necessary");
+        } else {
+            if let Some(number) = &value.number {
+                gen_values.push(
+                    quote::quote!{
+                        #val_name = #number,
+                    }
+                );
+            } else {
+                gen_values.push(
+                    quote::quote!{
+                        #val_name,
+                    }
+                );
+            }
+            gen_into_values.push(
+                quote::quote!{
+                    Self::#val_name => super::#super_enum_name::#val_name,
+                }
+            );
+
+            gen_from_values.push(
+                quote::quote!{
+                    super::#super_enum_name::#val_name => Self::#val_name,
+                }
+            );
+        }
+    }
+    let name = descriptor.name.clone().expect("Protobuf message needs a name");
+    let special_fn_from = quote::format_ident!("{}_convert_from", name.split('.').last().unwrap().to_lowercase());
+    let special_fn_into = quote::format_ident!("{}_convert_into", name.split('.').last().unwrap().to_lowercase());
+
+    quote::quote!{
+        #[wasm_bindgen]
+        #[repr(i32)]
+        #[derive(Clone, Copy)]
+        pub enum #enum_name {
+            #(#gen_values)*
+        }
+
+        impl std::convert::Into<super::#super_enum_name> for #enum_name {
+            fn into(self) -> super::#super_enum_name {
+                match self {
+                    #(#gen_into_values)*
+                }
+            }
+        }
+
+        impl std::convert::From<super::#super_enum_name> for #enum_name {
+            fn from(other: super::#super_enum_name) -> Self {
+                match other {
+                    #(#gen_from_values)*
+                }
+            }
+        }
+
+        #[inline]
+        #[allow(dead_code)]
+        fn #special_fn_from(other: i32) -> #enum_name {
+            #enum_name::from(super::#super_enum_name::from_i32(other).unwrap())
+        }
+
+        #[inline]
+        #[allow(dead_code)]
+        fn #special_fn_into(this: #enum_name) -> i32 {
+            this as i32
+        }
+    }
+}
+
+fn generate_service_io_types(service: &Service, fds: &FileDescriptorSet) -> proc_macro2::TokenStream {
+    let mut gen_types = Vec::with_capacity(service.methods.len() * 2);
+    let mut gen_enums = Vec::new();
+    let mut handled_enums = HashSet::new();
+    let mut handled_types = HashSet::new();
+    for method in &service.methods {
+        if let Some(input_message) = find_message_type(&method.input_type, &service.package, fds) {
+            let msg_name = input_message.name.clone().expect("Protobuf message name required");
+            if !handled_types.contains(&msg_name) {
+                handled_types.insert(msg_name);
+                gen_types.push(generate_wasm_struct_interop(input_message, &mut handled_enums, &mut handled_types, false, &service.name));
+            }
+        } else if let Some(input_enum) = find_enum_type(&method.input_type, &service.package, fds) {
+            let enum_name = input_enum.name.clone().expect("Protobuf enum name required");
+            if !handled_enums.contains(&enum_name) {
+                handled_enums.insert(enum_name);
+                gen_types.push(generate_wasm_enum_interop(input_enum, &service.name));
+            }
+        } else {
+            panic!("Cannot find proto type {}/{}", service.package, method.input_type);
+        }
+
+        if let Some(output_message) = find_message_type(&method.output_type, &service.package, fds) {
+            let msg_name = output_message.name.clone().expect("Protobuf message name required");
+            if !handled_types.contains(&msg_name) {
+                handled_types.insert(msg_name);
+                gen_types.push(generate_wasm_struct_interop(output_message, &mut handled_enums, &mut handled_types, true, &service.name));
+            }
+        } else if let Some(output_enum) = find_enum_type(&method.output_type, &service.package, fds) {
+            let enum_name = output_enum.name.clone().expect("Protobuf enum name required");
+            if !handled_enums.contains(&enum_name) {
+                handled_enums.insert(enum_name);
+                gen_types.push(generate_wasm_enum_interop(output_enum, &service.name));
+            }
+        } else {
+            panic!("Cannot find proto type {}/{}", service.package, method.input_type);
+        }
+    }
+
+    // always generate all enums, since they aren't encountered (ever, afaik) when generating message structs
+    for file in &fds.file {
+        for enum_type in &file.enum_type {
+            let enum_name = enum_type.name.clone().expect("Protobuf enum name required");
+            if !handled_enums.contains(&enum_name) {
+                handled_enums.insert(enum_name);
+                gen_enums.push(generate_wasm_enum_interop(enum_type, &service.name));
+            }
+        }
+    }
+    quote::quote! {
+        #(#gen_types)*
+
+        #(#gen_enums)*
+    }
+}
+
+impl IServiceGenerator for WasmServiceGenerator {
+    fn generate(&mut self, service: Service) -> proc_macro2::TokenStream {
+        let lock = self.shared.lock()
+            .expect("Cannot lock shared state");
+        let fds = lock.fds
+            .as_ref()
+            .expect("FileDescriptorSet required for WASM service generator");
+        let service_struct_name = quote::format_ident!("{}Client", service.name);
+        let service_js_name = quote::format_ident!("{}", service.name);
+        let service_methods = generate_service_methods(&service, fds);
+        let service_types = generate_service_io_types(&service, fds);
+        let mod_name = quote::format_ident!("js_{}", service.name.to_lowercase());
+        quote::quote!{
+            mod #mod_name {
+                use wasm_bindgen::prelude::*;
+
+                use crate::client_handler::WebSocketHandler;
+
+                #service_types
+
+                /// WASM/JS-compatible wrapper of the Rust nRPC service
+                #[wasm_bindgen]
+                pub struct #service_js_name {
+                    //#[wasm_bindgen(skip)]
+                    service: super::#service_struct_name<WebSocketHandler>,
+                }
+
+                #[wasm_bindgen]
+                impl #service_js_name {
+                    #[wasm_bindgen(constructor)]
+                    pub fn new(port: u16) -> Self {
+                        let implementation = super::#service_struct_name::new(
+                            WebSocketHandler::new(port)
+                        );
+                        Self {
+                            service: implementation,
+                        }
+                    }
+
+                    #service_methods
+                }
+            }
+        }
+    }
+}

usdpl-build/src/front/shared_state.rs

@@ -0,0 +1,26 @@
+use std::sync::{Arc, Mutex};
+
+use prost_types::FileDescriptorSet;
+
+#[derive(Clone)]
+pub struct SharedState(Arc<Mutex<SharedProtoData>>);
+
+impl SharedState {
+    pub fn new() -> Self {
+        Self(Arc::new(Mutex::new(SharedProtoData {
+            fds: None,
+        })))
+    }
+}
+
+impl std::ops::Deref for SharedState {
+    type Target = Arc<Mutex<SharedProtoData>>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+pub struct SharedProtoData {
+    pub fds: Option<FileDescriptorSet>,
+}

usdpl-build/src/lib.rs

@@ -0,0 +1,5 @@
+pub mod back;
+pub mod front;
+
+mod proto_files;
+pub use proto_files::{dump_protos, dump_protos_out, proto_out_path, all_proto_filenames};

usdpl-build/src/proto_files.rs

@@ -0,0 +1,44 @@
+use std::path::{Path, PathBuf};
+
+struct IncludedFileStr<'a> {
+    filename: &'a str,
+    contents: &'a str,
+}
+
+const DEBUG_PROTO: IncludedFileStr<'static> = IncludedFileStr {
+    filename: "debug.proto",
+    contents: include_str!("../protos/debug.proto"),
+};
+
+const TRANSLATIONS_PROTO: IncludedFileStr<'static> = IncludedFileStr {
+    filename: "translations.proto",
+    contents: include_str!("../protos/translations.proto"),
+};
+
+const ALL_PROTOS: [IncludedFileStr<'static>; 2] = [
+    DEBUG_PROTO,
+    TRANSLATIONS_PROTO,
+];
+
+pub fn proto_out_path() -> PathBuf {
+    PathBuf::from(std::env::var("OUT_DIR").expect("Not in a build.rs context (missing $OUT_DIR)")).join("protos")
+}
+
+pub fn all_proto_filenames() -> impl Iterator<Item = &'static str> {
+    ALL_PROTOS.iter().map(|x| x.filename)
+}
+
+pub fn dump_protos(p: impl AsRef<Path>) -> std::io::Result<()> {
+    let p = p.as_ref();
+    for f in ALL_PROTOS {
+        let fullpath = p.join(f.filename);
+        std::fs::write(fullpath, f.contents)?;
+    }
+    Ok(())
+}
+
+pub fn dump_protos_out() -> std::io::Result<()> {
+    let path = proto_out_path();
+    std::fs::create_dir_all(&path)?;
+    dump_protos(&path)
+}

usdpl-core/Cargo.toml

@@ -1,22 +1,21 @@
 [package]
 name = "usdpl-core"
-version = "0.10.0"
+version = "0.11.0"
 edition = "2021"
 license = "GPL-3.0-only"
 repository = "https://github.com/NGnius/usdpl-rs"
-readme = "README.md"
+readme = "../README.md"
 description = "Universal Steam Deck Plugin Library core"
 
 [features]
 default = []
 decky = []
-crankshaft = []
 encrypt = ["aes-gcm-siv"]
-translate = []
 
 [dependencies]
 base64 = "0.13"
 aes-gcm-siv = { version = "0.10", optional = true, default-features = false, features = ["alloc", "aes"] }
+# nrpc = "0.2"
 
 [dev-dependencies]
 hex-literal = "0.3.4"

usdpl-core/src/api_common/target.rs

@@ -4,8 +4,6 @@ pub enum Platform {
     Any,
     /// Decky aka PluginLoader platform
     Decky,
-    /// Crankshaft platform
-    Crankshaft,
 }
 
 impl Platform {
@@ -16,10 +14,6 @@ impl Platform {
         {
             Self::Decky
         }
-        #[cfg(all(feature = "crankshaft", not(any(feature = "decky"))))]
-        {
-            Self::Crankshaft
-        }
         #[cfg(not(any(feature = "decky", feature = "crankshaft")))]
         {
             Self::Any
@@ -32,7 +26,6 @@ impl std::fmt::Display for Platform {
         match self {
             Self::Any => write!(f, "any"),
             Self::Decky => write!(f, "decky"),
-            Self::Crankshaft => write!(f, "crankshaft"),
         }
     }
 }

usdpl-core/src/api_crankshaft/mod.rs

@@ -1 +0,0 @@
-

usdpl-core/src/socket.rs

@@ -40,10 +40,8 @@ pub enum Packet {
     /// Many packets merged into one
     Many(Vec<Packet>),
     /// Translation data dump
-    #[cfg(feature = "translate")]
     Translations(Vec<(String, Vec<String>)>),
     /// Request translations for language
-    #[cfg(feature = "translate")]
     Language(String),
 }
 
@@ -59,9 +57,7 @@ impl Packet {
             Self::Unsupported => 6,
             Self::Bad => 7,
             Self::Many(_) => 8,
-            #[cfg(feature = "translate")]
             Self::Translations(_) => 9,
-            #[cfg(feature = "translate")]
             Self::Language(_) => 10,
         }
     }
@@ -93,12 +89,10 @@ impl Loadable for Packet {
                 let (obj, len) = <_>::load(buf)?;
                 (Self::Many(obj), len)
             },
-            #[cfg(feature = "translate")]
             9 => {
                 let (obj, len) = <_>::load(buf)?;
                 (Self::Translations(obj), len)
             },
-            #[cfg(feature = "translate")]
             10 => {
                 let (obj, len) = <_>::load(buf)?;
                 (Self::Language(obj), len)
@@ -122,9 +116,7 @@ impl Dumpable for Packet {
             Self::Unsupported => Ok(0),
             Self::Bad => return Err(DumpError::Unsupported),
             Self::Many(v) => v.dump(buf),
-            #[cfg(feature = "translate")]
             Self::Translations(tr) => tr.dump(buf),
-            #[cfg(feature = "translate")]
             Self::Language(l) => l.dump(buf),
         }?;
         Ok(size1 + result)

usdpl-front/Cargo.toml

@@ -1,27 +1,27 @@
 [package]
 name = "usdpl-front"
-version = "0.10.1"
+version = "0.11.0"
 authors = ["NGnius (Graham) <ngniusness@gmail.com>"]
 edition = "2021"
 license = "GPL-3.0-only"
 repository = "https://github.com/NGnius/usdpl-rs"
-readme = "README.md"
+readme = "../README.md"
 description = "Universal Steam Deck Plugin Library front-end designed for WASM"
 
 [lib]
 crate-type = ["cdylib", "rlib"]
 
 [features]
-default = ["translate"]
+default = []
 decky = ["usdpl-core/decky"]
-crankshaft = ["usdpl-core/crankshaft"]
 debug = ["console_error_panic_hook"]
 encrypt = ["usdpl-core/encrypt", "obfstr", "hex"]
-translate = ["usdpl-core/translate"]
 
 [dependencies]
 wasm-bindgen = "0.2"
 wasm-bindgen-futures = "0.4"
+gloo-net = { version = "0.2", features = ["websocket"] }
+futures = "0.3"
 
 # The `console_error_panic_hook` crate provides better debugging of panics by
 # logging them with `console.error`. This is great for development, but requires
@@ -39,10 +39,17 @@ web-sys = { version = "0.3", features = [
 ]}
 js-sys = { version = "0.3" }
 
+async-channel = "1.8"
+
 obfstr = { version = "0.3", optional = true }
 hex = { version = "0.4", optional = true }
 
-usdpl-core = { version = "0.10", path = "../usdpl-core" }
+nrpc = "0.2"
+usdpl-core = { version = "0.11", path = "../usdpl-core" }
+prost = "0.11"
 
 [dev-dependencies]
 wasm-bindgen-test = { version = "0.3.13" }
+
+[build-dependencies]
+usdpl-build = { version = "0.11", path = "../usdpl-build" }

usdpl-front/build.rs

@@ -0,0 +1,3 @@
+fn main() {
+    usdpl_build::front::build()
+}

usdpl-front/src/client_handler.rs

@@ -0,0 +1,81 @@
+use std::sync::atomic::{AtomicU64, Ordering};
+
+use nrpc::{ClientHandler, ServiceError, _helpers::bytes, _helpers::async_trait};
+use gloo_net::websocket::{Message, futures::WebSocket};
+use wasm_bindgen_futures::spawn_local;
+use futures::{SinkExt, StreamExt};
+
+static LAST_ID: AtomicU64 = AtomicU64::new(0);
+
+pub struct WebSocketHandler {
+    // TODO
+    port: u16,
+}
+
+async fn send_recv_ws(url: String, input: bytes::Bytes) -> Result<Vec<u8>, String> {
+    let mut ws = WebSocket::open(&url).map_err(|e| e.to_string())?;
+    ws.send(Message::Bytes(input.into())).await.map_err(|e| e.to_string())?;
+
+    read_next_incoming(ws).await
+}
+
+async fn read_next_incoming(mut ws: WebSocket) -> Result<Vec<u8>, String> {
+    if let Some(msg) = ws.next().await {
+        match msg.map_err(|e| e.to_string())? {
+            Message::Bytes(b) => Ok(b),
+            Message::Text(_) => Err("Message::Text not allowed".into()),
+        }
+    } else {
+        Err("No response received".into())
+    }
+}
+
+#[derive(Debug)]
+struct ErrorStr(String);
+
+impl std::fmt::Display for ErrorStr {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "Error message: {}", self.0)
+    }
+}
+
+impl std::error::Error for ErrorStr {}
+
+impl WebSocketHandler {
+    #[allow(dead_code)]
+    pub fn new(port: u16) -> Self {
+        Self { port }
+    }
+}
+
+#[async_trait::async_trait]
+impl ClientHandler for WebSocketHandler {
+    async fn call(&mut self,
+            service: &str,
+            method: &str,
+            input: bytes::Bytes,
+            output: &mut bytes::BytesMut) -> Result<(), ServiceError> {
+        let id = LAST_ID.fetch_add(1, Ordering::SeqCst);
+        let url = format!(
+            "ws://usdpl-ws-{}.localhost:{}/{}/{}",
+            id,
+            self.port,
+            service,
+            method,
+        );
+        let (tx, rx) = async_channel::bounded(1);
+        spawn_local(async move {
+            tx.send(send_recv_ws(
+                url,
+                input
+            ).await).await.unwrap_or(());
+        });
+
+        output.extend_from_slice(
+            &rx.recv().await
+                .map_err(|e| ServiceError::Method(Box::new(e)))?
+                .map_err(|e| ServiceError::Method(Box::new(ErrorStr(e))))?
+        );
+        Ok(())
+    }
+}

usdpl-front/src/lib.rs

@@ -5,10 +5,16 @@
 //!
 #![warn(missing_docs)]
 
+mod client_handler;
 mod connection;
 mod convert;
 mod imports;
 
+#[allow(missing_docs)] // existence is pain otherwise
+pub mod _nrpc_js_interop {
+    include!(concat!(env!("OUT_DIR"), "/usdpl.rs"));
+}
+
 use std::sync::atomic::{AtomicU64, Ordering};
 
 use js_sys::Array;
@@ -19,7 +25,7 @@ use usdpl_core::{socket::Packet, RemoteCall};
 //const REMOTE_PORT: std::sync::atomic::AtomicU16 = std::sync::atomic::AtomicU16::new(31337);
 
 static mut CTX: UsdplContext = UsdplContext {
-    port: 31337,
+    port: 0,
     id: AtomicU64::new(0),
     #[cfg(feature = "encrypt")]
     key: Vec::new(),
@@ -27,7 +33,6 @@ static mut CTX: UsdplContext = UsdplContext {
 
 static mut CACHE: Option<std::collections::HashMap<String, JsValue>> = None;
 
-#[cfg(feature = "translate")]
 static mut TRANSLATIONS: Option<std::collections::HashMap<String, Vec<String>>> = None;
 
 #[cfg(feature = "encrypt")]