/// Child process for the remoting round-trip test.
/// Reads one framed CBOR message from stdin, expects ["ping"],
/// and replies with ["pong"] on stdout.
const std = @import("std");
const cbor = @import("cbor");
const framing = @import("framing");

pub fn main() !void {
    var acc: framing.Accumulator = .{};
    var read_buf: [4096]u8 = undefined;

    const frame = while (true) {
        const n = try std.fs.File.stdin().read(&read_buf);
        if (n == 0) return error.UnexpectedEof;
        if (acc.feed(read_buf[0..n])) |f| break f;
    };

    if (!try cbor.match(frame, .{"ping"})) return error.UnexpectedMessage;

    var msg_buf: [64]u8 = undefined;
    var stream: std.Io.Writer = .fixed(&msg_buf);
    try cbor.writeValue(&stream, .{"pong"});
    try framing.write_frame(std.fs.File.stdout(), stream.buffered());
}