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use std::collections::HashMap;
use std::ffi::OsStr;
use std::io::BufReader;
use std::path::Path;
use std::process::{Child, ChildStdin, ChildStdout, Command, Stdio};
use std::thread;
use super::reader::{EngineCommandReader, EngineOutput};
use super::writer::GuiCommandWriter;
use crate::error::Error;
use crate::protocol::*;
#[derive(Clone, Debug, Default)]
pub struct EngineInfo {
name: String,
options: HashMap<String, String>,
}
impl EngineInfo {
pub fn name(&self) -> &str {
&self.name
}
pub fn options(&self) -> &HashMap<String, String> {
&self.options
}
}
#[derive(Debug)]
pub struct UsiEngineHandler {
process: Child,
reader: Option<EngineCommandReader<BufReader<ChildStdout>>>,
writer: GuiCommandWriter<ChildStdin>,
}
impl Drop for UsiEngineHandler {
fn drop(&mut self) {
self.kill().unwrap();
}
}
impl UsiEngineHandler {
pub fn spawn<P: AsRef<OsStr>, Q: AsRef<Path>>(
engine_path: P,
working_dir: Q,
) -> Result<Self, Error> {
let mut process = Command::new(engine_path)
.current_dir(working_dir)
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.spawn()?;
let stdin = process.stdin.take().unwrap();
let stdout = process.stdout.take().unwrap();
Ok(UsiEngineHandler {
process,
reader: Some(EngineCommandReader::new(BufReader::new(stdout))),
writer: GuiCommandWriter::new(stdin),
})
}
pub fn get_info(&mut self) -> Result<EngineInfo, Error> {
let reader = match &mut self.reader {
Some(r) => Ok(r),
None => Err(Error::IllegalOperation),
}?;
let mut info = EngineInfo::default();
self.writer.send(&GuiCommand::Usi)?;
loop {
let output = reader.next_command()?;
match output.response() {
Some(EngineCommand::Id(IdParams::Name(name))) => {
info.name = name.to_string();
}
Some(EngineCommand::Option(OptionParams {
ref name,
ref value,
})) => {
info.options.insert(
name.to_string(),
match value {
OptionKind::Check { default: Some(f) } => {
if *f { "true" } else { "false" }.to_string()
}
OptionKind::Spin {
default: Some(n), ..
} => n.to_string(),
OptionKind::Combo {
default: Some(s), ..
} => s.to_string(),
OptionKind::Button { default: Some(s) } => s.to_string(),
OptionKind::String { default: Some(s) } => s.to_string(),
OptionKind::Filename { default: Some(s) } => s.to_string(),
_ => String::new(),
},
);
}
Some(EngineCommand::UsiOk) => break,
_ => {}
}
}
Ok(info)
}
pub fn prepare(&mut self) -> Result<(), Error> {
let reader = match &mut self.reader {
Some(r) => Ok(r),
None => Err(Error::IllegalOperation),
}?;
self.writer.send(&GuiCommand::IsReady)?;
loop {
let output = reader.next_command()?;
if let Some(EngineCommand::ReadyOk) = output.response() {
break;
}
}
Ok(())
}
pub fn send_command(&mut self, command: &GuiCommand) -> Result<(), Error> {
self.writer.send(command)
}
pub fn kill(&mut self) -> Result<(), Error> {
self.writer.send(&GuiCommand::Quit)?;
self.process.kill()?;
Ok(())
}
pub fn listen<F, E>(&mut self, mut hook: F) -> Result<(), Error>
where
F: FnMut(&EngineOutput) -> Result<(), E> + Send + 'static,
E: std::error::Error + Send + Sync + 'static,
{
let mut reader = self.reader.take().ok_or(Error::IllegalOperation)?;
thread::spawn(move || -> Result<(), Error> {
loop {
match reader.next_command() {
Ok(output) => {
if let Err(e) = hook(&output) {
return Err(Error::HandlerError(Box::new(e)));
}
}
Err(Error::IllegalSyntax) => {
continue;
}
Err(err) => {
return Err(err);
}
}
}
});
Ok(())
}
}