readcon-core 0.14.3

An oxidized single and multiple CON file reader and writer with FFI bindings for ergonomic C/C++ usage.
Documentation 
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use capnp::capability::Promise;
use capnp_rpc::{pry, rpc_twoparty_capnp, twoparty, RpcSystem};
use futures::AsyncReadExt;

use crate::iterators::ConFrameIterator;
use crate::writer::ConFrameWriter;

use super::convert::{fill_frame_builder, frame_from_reader};
use super::read_con_capnp::read_con_service;

struct ReadConServiceImpl;

impl read_con_service::Server for ReadConServiceImpl {
    fn parse_frames(
        &mut self,
        params: read_con_service::ParseFramesParams,
        mut results: read_con_service::ParseFramesResults,
    ) -> Promise<(), capnp::Error> {
        let req = pry!(params.get());
        let file_bytes = pry!(pry!(req.get_req()).get_file_contents());
        let file_str = match std::str::from_utf8(file_bytes) {
            Ok(s) => s,
            Err(e) => return Promise::err(capnp::Error::failed(e.to_string())),
        };

        let frames: Result<Vec<_>, _> = ConFrameIterator::new(file_str).collect();
        let frames = match frames {
            Ok(f) => f,
            Err(e) => return Promise::err(capnp::Error::failed(e.to_string())),
        };

        let mut result_builder = results.get().init_result();
        let mut frames_builder = result_builder.reborrow().init_frames(frames.len() as u32);

        for (i, frame) in frames.iter().enumerate() {
            let fb = frames_builder.reborrow().get(i as u32);
            if let Err(e) = fill_frame_builder(fb, frame) {
                return Promise::err(capnp::Error::failed(e));
            }
        }

        Promise::ok(())
    }

    fn write_frames(
        &mut self,
        params: read_con_service::WriteFramesParams,
        mut results: read_con_service::WriteFramesResults,
    ) -> Promise<(), capnp::Error> {
        let req = pry!(params.get());
        let frame_data_list = pry!(pry!(req.get_req()).get_frames());

        let mut frames = Vec::with_capacity(frame_data_list.len() as usize);
        for i in 0..frame_data_list.len() {
            let fd = frame_data_list.get(i);
            match frame_from_reader(fd) {
                Ok(f) => frames.push(f),
                Err(e) => return Promise::err(capnp::Error::failed(e)),
            }
        }

        let mut buffer: Vec<u8> = Vec::new();
        {
            let mut writer = ConFrameWriter::new(&mut buffer);
            if let Err(e) = writer.extend(frames.iter()) {
                return Promise::err(capnp::Error::failed(e.to_string()));
            }
        }

        results.get().init_result().set_file_contents(&buffer);

        Promise::ok(())
    }
}

/// Starts an RPC server on the given address.
///
/// This function blocks until the server is shut down.
pub async fn start_server(addr: &str) -> Result<(), Box<dyn std::error::Error>> {
    let listener = tokio::net::TcpListener::bind(addr).await?;
    let service: read_con_service::Client = capnp_rpc::new_client(ReadConServiceImpl);

    loop {
        let (stream, _) = listener.accept().await?;
        stream.set_nodelay(true)?;
        let (reader, writer) = tokio_util::compat::TokioAsyncReadCompatExt::compat(stream).split();
        let network = twoparty::VatNetwork::new(
            reader,
            writer,
            rpc_twoparty_capnp::Side::Server,
            Default::default(),
        );
        let rpc_system = RpcSystem::new(Box::new(network), Some(service.clone().client));
        tokio::task::spawn_local(rpc_system);
    }
}