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annotate src/bin/server.rs @ 19:ba09079686a0

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Add support for different endianness between client and server.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Thu, 26 Aug 2021 23:43:36 +0200
parents 3f7b7a3ad8fe
children
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1 // Tablet emulator, for people who don’t own one
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2 // Copyright © 2020 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
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3 //
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4 // This program is free software: you can redistribute it and/or modify
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5 // it under the terms of the GNU Affero General Public License as published by
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6 // the Free Software Foundation, either version 3 of the License, or
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7 // (at your option) any later version.
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8 //
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9 // This program is distributed in the hope that it will be useful,
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10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 // GNU Affero General Public License for more details.
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13 //
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14 // You should have received a copy of the GNU Affero General Public License
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15 // along with this program. If not, see <https://www.gnu.org/licenses/>.
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16
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17 use input_linux::Key;
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18 use std::io::{self, ErrorKind};
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19 use std::net::UdpSocket;
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20 use tablet_emu::protocol::{Buttons, Event};
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21 use tablet_emu::state::State;
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22
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23 pub fn run_server(address: &str) -> io::Result<()> {
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24 let mut state = match State::new() {
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25 Ok(state) => state,
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26 Err(err) => {
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27 match err.kind() {
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28 ErrorKind::NotFound => {
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29 eprintln!("Couldn’t find /dev/uinput: {}", err);
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30 eprintln!("Maybe you forgot to `modprobe uinput`?");
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31 }
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32 ErrorKind::PermissionDenied => {
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33 eprintln!("Couldn’t open /dev/uinput for writing: {}", err);
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34 eprintln!("Maybe you aren’t allowed to create input devices?");
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35 }
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36 _ => eprintln!("Couldn’t open /dev/uinput for writing: {}", err),
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37 }
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38 std::process::exit(1);
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39 }
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40 };
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41
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42 let socket = UdpSocket::bind(address)?;
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43 println!("Listening on {:?}", socket);
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44 println!("Here is an example client: https://hg.linkmauve.fr/remote-gamepad");
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45
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46 let mut last = Some((0., 0.));
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47 state.set_size(320, 240);
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48 loop {
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49 let mut buf: [u8; 16] = Default::default();
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50 let (amount, source) = socket.recv_from(&mut buf)?;
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51 if amount != std::mem::size_of::<Event>() {
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52 eprintln!("Invalid data length: {}", amount);
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53 continue;
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54 }
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55 let event: Event = bincode::deserialize(&buf).unwrap();
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56 println!("{:?} from {:?}", event, source);
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57 if event.buttons.contains(Buttons::A) {
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58 state.select_tool(Key::ButtonToolPen);
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59 } else if event.buttons.contains(Buttons::B) {
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60 state.select_tool(Key::ButtonToolRubber);
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61 } else if event.buttons.contains(Buttons::X) {
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62 state.select_tool(Key::ButtonToolBrush);
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63 } else if event.buttons.contains(Buttons::Y) {
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64 state.select_tool(Key::ButtonToolPencil);
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65 } else if event.buttons.contains(Buttons::SELECT) {
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66 state.select_tool(Key::ButtonToolAirbrush);
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67 } else if event.buttons.contains(Buttons::RESIZE) {
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68 println!(
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69 "set_size({}, {})",
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70 event.touch.0 as i32, event.touch.1 as i32
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71 );
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72 state.set_size(event.touch.0 as i32, event.touch.1 as i32);
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73 }
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74 let (x, y) = event.touch;
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75 if event.buttons.contains(Buttons::TOUCH) {
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76 if let None = last {
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77 state.press(x as f64, y as f64)?;
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78 last = Some((x as f64, y as f64));
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79 continue;
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80 }
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81 } else {
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82 if let Some((x, y)) = last {
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83 state.release(x, y)?;
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84 last = None;
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85 continue;
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86 }
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87 }
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88 state.motion(x as f64, y as f64)?;
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89 last = Some((x as f64, y as f64));
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90 }
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91 }
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92
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93 pub fn main() {
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94 let args: Vec<_> = std::env::args().collect();
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95 let address = if args.len() > 1 {
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96 args[1].clone()
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97 } else {
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98 String::from("0.0.0.0:16150")
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99 };
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100 run_server(&address).unwrap();
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101 }