rust/hedgewars-server/src/server/io.rs
author alfadur
Wed, 10 Apr 2019 23:56:53 +0300
changeset 14806 a1077e8d26f4
parent 14802 01f8ab45f806
child 15095 c5a6e8566425
permissions -rw-r--r--
implement watch message apart from replay deserializing
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use std::{
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    fs::{File, OpenOptions},
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    io::{Error, ErrorKind, Read, Result, Write},
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    sync::mpsc,
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    thread,
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};
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use crate::server::{
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    database::Database,
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    handlers::{IoResult, IoTask},
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};
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use log::*;
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use mio::{Evented, Poll, PollOpt};
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use mio_extras::channel;
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pub type RequestId = u32;
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pub struct IOThread {
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    core_tx: mpsc::Sender<(RequestId, IoTask)>,
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    core_rx: channel::Receiver<(RequestId, IoResult)>,
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}
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impl IOThread {
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    pub fn new() -> Self {
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        let (core_tx, io_rx) = mpsc::channel();
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        let (io_tx, core_rx) = channel::channel();
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        let mut db = Database::new();
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        db.connect("localhost");
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        thread::spawn(move || {
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            while let Ok((request_id, task)) = io_rx.try_recv() {
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                let response = match task {
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                    IoTask::GetAccount {
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                        nick,
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                        protocol,
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                        password_hash,
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                        client_salt,
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                        server_salt,
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                    } => {
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                        match db.get_account(
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                            &nick,
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                            protocol,
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                            &password_hash,
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                            &client_salt,
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                            &server_salt,
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                        ) {
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                            Ok(account) => IoResult::Account(account),
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                            Err(e) => {
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                                warn!("Unable to get account data: {}", e);
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                                IoResult::Account(None)
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                            }
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                        }
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                    }
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                    IoTask::GetReplay { id } => {
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                        let result = match db.get_replay_name(id) {
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                            Ok(Some(filename)) => {
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                                let filename = format!(
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                                    "checked/{}",
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                                    if filename.starts_with("replays/") {
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                                        &filename[8..]
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                                    } else {
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                                        &filename
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                                    }
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                                );
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                                match load_file(&filename) {
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                                    Ok(contents) => Some(unimplemented!()),
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                                    Err(e) => {
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                                        warn!(
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                                            "Error while writing the room config file \"{}\": {}",
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                                            filename, e
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                                        );
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                                        None
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                                    }
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                                }
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                            }
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                            Ok(None) => None,
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                            Err(e) => {
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                                warn!("Unable to get replay name: {}", e);
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                                None
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                            }
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                        };
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                        IoResult::Replay(result)
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                    }
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                    IoTask::SaveRoom {
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                        room_id,
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                        filename,
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                        contents,
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                    } => {
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                        let result = match save_file(&filename, &contents) {
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                            Ok(()) => true,
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                            Err(e) => {
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                                warn!(
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                                    "Error while writing the room config file \"{}\": {}",
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                                    filename, e
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                                );
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                                false
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                            }
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                        };
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                        IoResult::SaveRoom(room_id, result)
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                    }
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                    IoTask::LoadRoom { room_id, filename } => {
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                        let result = match load_file(&filename) {
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                            Ok(contents) => Some(contents),
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                            Err(e) => {
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                                warn!(
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                                    "Error while writing the room config file \"{}\": {}",
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                                    filename, e
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                                );
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                                None
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                            }
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                        };
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                        IoResult::LoadRoom(room_id, result)
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                    }
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                };
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                io_tx.send((request_id, response));
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            }
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        });
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        Self { core_rx, core_tx }
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    }
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    pub fn send(&self, request_id: RequestId, task: IoTask) {
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        self.core_tx.send((request_id, task)).unwrap();
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    }
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    pub fn try_recv(&self) -> Option<(RequestId, IoResult)> {
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        match self.core_rx.try_recv() {
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            Ok(result) => Some(result),
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            Err(mpsc::TryRecvError::Empty) => None,
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            Err(mpsc::TryRecvError::Disconnected) => unreachable!(),
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        }
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    }
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    pub fn register_rx(&self, poll: &mio::Poll, token: mio::Token) -> Result<()> {
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        self.core_rx
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            .register(poll, token, mio::Ready::readable(), PollOpt::edge())
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    }
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}
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fn save_file(filename: &str, contents: &str) -> Result<()> {
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    let mut writer = OpenOptions::new().create(true).write(true).open(filename)?;
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    writer.write_all(contents.as_bytes())
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}
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fn load_file(filename: &str) -> Result<String> {
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    let mut reader = File::open(filename)?;
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    let mut result = String::new();
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    reader.read_to_string(&mut result)?;
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    Ok(result)
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}