100 lines
2.9 KiB
Rust
100 lines
2.9 KiB
Rust
use std::path::PathBuf;
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use std::{env, fmt::Write};
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struct CustomGenerator {}
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fn write_method_enum(buf: &mut String, service: &prost_build::Service) {
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buf.push_str(
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r#"
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use num_enum::TryFromPrimitive;
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#[derive(PartialEq,TryFromPrimitive)]
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#[repr(u32)]
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pub enum BackendMethod {
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"#,
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);
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for (idx, method) in service.methods.iter().enumerate() {
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writeln!(buf, " {} = {},", method.proto_name, idx + 1).unwrap();
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}
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buf.push_str("}\n\n");
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}
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fn write_method_trait(buf: &mut String, service: &prost_build::Service) {
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buf.push_str(
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r#"
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use prost::Message;
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pub type BackendResult<T> = std::result::Result<T, crate::err::AnkiError>;
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pub trait BackendService {
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fn run_command_bytes2_inner(&self, method: u32, input: &[u8]) -> std::result::Result<Vec<u8>, crate::err::AnkiError> {
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match method {
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"#,
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);
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for (idx, method) in service.methods.iter().enumerate() {
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write!(
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buf,
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concat!(" ",
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"{idx} => {{ let input = {input_type}::decode(input)?;\n",
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"let output = self.{rust_method}(input)?;\n",
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"let mut out_bytes = Vec::new(); output.encode(&mut out_bytes)?; Ok(out_bytes) }}, "),
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idx = idx + 1,
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input_type = method.input_type,
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rust_method = method.name
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)
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.unwrap();
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}
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buf.push_str(
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r#"
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_ => Err(crate::err::AnkiError::invalid_input("invalid command")),
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}
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}
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"#,
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);
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for method in &service.methods {
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write!(
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buf,
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concat!(
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" fn {method_name}(&self, input: {input_type}) -> ",
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"BackendResult<{output_type}>;\n"
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),
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method_name = method.name,
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input_type = method.input_type,
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output_type = method.output_type
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)
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.unwrap();
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}
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buf.push_str("}\n");
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}
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impl prost_build::ServiceGenerator for CustomGenerator {
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fn generate(&mut self, service: prost_build::Service, buf: &mut String) {
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write_method_enum(buf, &service);
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write_method_trait(buf, &service);
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}
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}
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fn service_generator() -> Box<dyn prost_build::ServiceGenerator> {
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Box::new(CustomGenerator {})
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}
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pub fn write_backend_proto_rs() {
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let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
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let backend_proto;
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let proto_dir;
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if let Ok(proto) = env::var("BACKEND_PROTO") {
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backend_proto = PathBuf::from(proto);
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proto_dir = backend_proto.parent().unwrap().to_owned();
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} else {
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backend_proto = PathBuf::from("backend.proto");
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proto_dir = PathBuf::from(".");
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}
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let fluent_proto = out_dir.join("fluent.proto");
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let mut config = prost_build::Config::new();
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config
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.out_dir(&out_dir)
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.service_generator(service_generator())
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.compile_protos(&[&backend_proto, &fluent_proto], &[&proto_dir, &out_dir])
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.unwrap();
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}
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