src/main.rs

   1 use std::f32::consts::PI;
   2 use std::convert::From;
   3 use std::env;
   4 use std::io::Cursor;
   5 use std::fmt::Display;
   6 use std::fmt;
   7 use std::borrow::BorrowMut;
   8 use std::sync::{Arc, Mutex};
   9 use log::{debug, LevelFilter};
  10 use num_traits::Zero;
  11 use num_traits::cast::AsPrimitive;
  12 use percent_encoding::percent_decode_str;
  13 use actix_web::{middleware::Logger, get, web, App, HttpServer, HttpRequest, HttpResponse, Responder, ResponseError, Result};
  14 use actix_web::body::BoxBody;
  15 use actix_web::http::StatusCode;
  16 use actix_web::cookie::time::OffsetDateTime;
  17 use image::{ImageBuffer, ColorType, Rgb, RgbImage, write_buffer_with_format};
  18 use image::ImageOutputFormat::Png;
  19 use image::imageops::{FilterType, overlay, resize};
  20 use image::error::{LimitError, LimitErrorKind};
  21
  22
  23 const TIMEAVATAR_SIZE_U32: u32 = 6;
  24 const TIMEAVATAR_SIZE_I64: i64 = TIMEAVATAR_SIZE_U32 as i64;
  25
  26 macro_rules! response_image {
  27     ($cursor:expr) => {
  28         HttpResponse::build(StatusCode::OK)
  29             .content_type("image/png")
  30             .body($cursor.into_inner())
  31     }
  32 }
  33
  34 macro_rules! extract_data {
  35     ($req:expr,$n:expr) => {
  36         $req.uri().path().split('/').nth($n).unwrap()
  37     }
  38 }
  39
  40 macro_rules! extract_color {
  41     ($req:expr,$n:expr) => {
  42         {
  43             let data_raw = extract_data!($req, $n);
  44             let mut data_decoded = percent_decode_str(data_raw);
  45             let mut rgb = ToRgbIter::new(&mut data_decoded);
  46             let color = rgb.next().ok_or(ColorError(data_raw.to_owned()))?;
  47             match rgb.next() {
  48                 Some(_) => Err(ColorError(data_raw.to_owned())),
  49                 _ => Ok(color)
  50             }
  51         }
  52     }
  53 }
  54
  55 macro_rules! extract_header {
  56     ($req:expr,$header:expr) => {
  57         match $req.headers().get($header) {
  58             Some(header) => header.to_str().unwrap_or(""),
  59             _ => ""
  60         }
  61     }
  62 }
  63
  64 #[derive(Debug)]
  65 struct ColorError(String);
  66
  67 impl Display for ColorError {
  68     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
  69         write!(f, "Invalid color specification: {}", &self.0)
  70     }
  71 }
  72
  73 impl ResponseError for ColorError {
  74     fn status_code(&self) -> StatusCode {
  75         StatusCode::INTERNAL_SERVER_ERROR
  76     }
  77
  78     fn error_response(&self) -> HttpResponse<BoxBody> {
  79         HttpResponse::InternalServerError().body(format!("{}\n", &self))
  80     }
  81 }
  82
  83 #[derive(Debug)]
  84 struct ImageError(image::ImageError);
  85
  86 impl ImageError {
  87     fn dimension_error() -> ImageError {
  88         ImageError(image::ImageError::Limits(LimitError::from_kind(LimitErrorKind::DimensionError)))
  89     }
  90 }
  91
  92 impl Display for ImageError {
  93     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
  94         write!(f, "{}", &self.0)
  95     }
  96 }
  97
  98 impl ResponseError for ImageError {
  99     fn status_code(&self) -> StatusCode {
 100         StatusCode::INTERNAL_SERVER_ERROR
 101     }
 102
 103     fn error_response(&self) -> HttpResponse<BoxBody> {
 104         HttpResponse::InternalServerError().body(format!("{}\n", &self))
 105     }
 106 }
 107
 108 impl From<image::ImageError> for ImageError {
 109     fn from(e: image::ImageError) -> Self {
 110         Self(e)
 111     }
 112 }
 113
 114 #[derive(Debug)]
 115 enum CanvasError {
 116     NotExists,
 117     DimensionMismatch((u32, u32)),
 118     ImageError(ImageError)
 119 }
 120
 121 impl Display for CanvasError {
 122     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 123         write!(f, "Canvas Error: see error_response() for more details")
 124     }
 125 }
 126
 127 impl ResponseError for CanvasError {
 128     fn status_code(&self) -> StatusCode {
 129         match &self {
 130             CanvasError::NotExists => StatusCode::NOT_FOUND,
 131             CanvasError::DimensionMismatch(_) => StatusCode::BAD_REQUEST,
 132             CanvasError::ImageError(e) => e.status_code()
 133         }
 134     }
 135
 136     fn error_response(&self) -> HttpResponse<BoxBody> {
 137         match &self {
 138             CanvasError::NotExists => HttpResponse::NotFound().body("Canvas does not exist."),
 139             CanvasError::DimensionMismatch(dim) =>
 140                 HttpResponse::BadRequest().body(format!("Supplied dimensions don't match the dimensions of existing canvas {:?}.", dim)),
 141             CanvasError::ImageError(e) => e.error_response()
 142         }
 143     }
 144 }
 145
 146 impl From<ImageError> for CanvasError {
 147     fn from(e: ImageError) -> CanvasError {
 148         CanvasError::ImageError(e)
 149     }
 150 }
 151
 152 struct ToRgbIter<'a, T> where T: AsPrimitive<u8> {
 153     iter: &'a mut dyn Iterator<Item = T>
 154 }
 155
 156 impl<'a, T: AsPrimitive<u8>> ToRgbIter<'a, T> {
 157     fn new(iter: &'a mut (dyn Iterator<Item = T>)) -> ToRgbIter<T> {
 158         ToRgbIter { iter }
 159     }
 160 }
 161
 162 impl<T: AsPrimitive<u8> + Zero> Iterator for ToRgbIter<'_, T> {
 163     type Item = Rgb<u8>;
 164     fn next(&mut self) -> Option<Rgb<u8>> {
 165         if let Some(r) = self.iter.next() {
 166             let g = self.iter.next().unwrap_or_else(T::zero);
 167             let b = self.iter.next().unwrap_or_else(T::zero);
 168             Some(Rgb([r.as_(), g.as_(), b.as_()]))
 169         }
 170         else {
 171             None
 172         }
 173     }
 174 }
 175
 176 #[derive(Debug)]
 177 struct Canvas {
 178     pen: usize,
 179     img: RgbImage
 180 }
 181
 182 impl Canvas {
 183     fn new(width: u32, height: u32) -> Canvas {
 184         Canvas { pen: 0, img: ImageBuffer::new(width, height) }
 185     }
 186
 187     /*fn from_image(img: RgbImage) -> Canvas {
 188         Canvas { pen: 0, img }
 189     }
 190
 191     fn replace(&self, img: RgbImage, pen: usize) -> Canvas {
 192         self.img = img;
 193         self.pen = pen;
 194         self
 195     }*/
 196
 197     fn advance_pen(mut self, offset: usize) -> Canvas {
 198         //Canvas { pen: self.pen + offset, img: self.img }
 199         self.pen += offset;
 200         self.pen %= self.img.width() as usize * self.img.height() as usize;
 201         self
 202     }
 203 }
 204
 205 struct Canvas0(Option<Canvas>);
 206 struct Canvas1(Option<Canvas>);
 207 struct Canvas2(Option<Canvas>);
 208
 209 #[get("/hello/{name}")]
 210 async fn greet(name: web::Path<String>, req: HttpRequest) -> impl Responder {
 211     println!("{:?}", req);
 212     format!("Hello {name}!\n{:?}", req.headers().get("user-agent"))
 213 }
 214
 215 fn rgb_encode_with_pen(img: &mut RgbImage, pen: usize, data: &mut dyn Iterator<Item = u8>) -> Result<usize, ImageError> {
 216     let mut pixels = img.pixels_mut().skip(pen);
 217     let mut counter = 0;
 218
 219     for sp in ToRgbIter::new(data) {
 220         let mut dp = match pixels.next() {
 221             Some(pixel) => pixel,
 222             None => {
 223                 pixels = img.pixels_mut().skip(0);
 224                 pixels.next().ok_or_else(ImageError::dimension_error)?
 225             }
 226         };
 227         dp.0 = sp.0;
 228         counter += 1;
 229     }
 230
 231     Ok(counter)
 232 }
 233
 234 fn rgb_encode_to_canvas(mut canvas: Canvas, data: &mut dyn Iterator<Item = u8>) -> Result<Canvas, CanvasError> {
 235     let counter = rgb_encode_with_pen(&mut canvas.img, canvas.pen, data)?;
 236     Ok(canvas.advance_pen(counter))
 237 }
 238
 239 fn rgb_encode(mut img: RgbImage, data: &mut dyn Iterator<Item = u8>) -> Result<RgbImage, ImageError> {
 240     rgb_encode_with_pen(&mut img, 0, data)?;
 241     Ok(img)
 242 }
 243
 244 fn sine_encode(mut img: RgbImage, wave_offset: (u32, u32), amplitude: f32, freq_base: f32, run: u32, wave_color: Rgb<u8>,
 245     data: &mut dyn Iterator<Item = u8>) -> Result<RgbImage, ImageError>
 246 {
 247     let run: f32 = run as f32;
 248     let (wave_offset_x, wave_offset_y) = wave_offset;
 249     let (wave_offset_x, wave_offset_y) = (wave_offset_x as f32, wave_offset_y as f32);
 250     let signal = &mut data.peekable();
 251     let mut x: f32 = wave_offset_x as f32;
 252     let max_x: f32 = (img.width() - 1) as f32;
 253     let max_y: f32 = img.height() as f32;
 254     while signal.peek().is_some() && (x < max_x) {
 255         let px = x;
 256         let s = signal.next().unwrap_or(0);
 257         while ((x - px) < run) && (x < max_x) {
 258             let y = if s != 0 {
 259                 (2.0 * PI * freq_base * x * s as f32).sin() * amplitude + wave_offset_y
 260             }
 261             else { wave_offset_y };
 262             x += 0.001;
 263             if (y > 0.0) && (y < max_y) {
 264                 img.put_pixel(x as u32, y as u32, wave_color);
 265             }
 266         }
 267     }
 268     Ok(img)
 269 }
 270
 271 fn offset_encode(mut img: RgbImage, offset: (u32, u32), run: u32, color: Rgb<u8>, data: &mut dyn Iterator<Item = u8>) -> Result<RgbImage, ImageError> {
 272     let (offset_x, offset_y) = offset;
 273     let mut x = offset_x;
 274     let mut data = data.peekable();
 275     while (x < img.width()) && (data.peek().is_some()) {
 276         let v = data.next().unwrap_or(0);
 277         let y = offset_y + v as u32;
 278         let max_x = if (x + run) < img.width() { x + run } else { img.width() };
 279         while x < max_x {
 280             if y < img.height() {
 281                 img.put_pixel(x, offset_y + v as u32, color);
 282             }
 283             x += 1;
 284         }
 285     }
 286     Ok(img)
 287 }
 288
 289 fn apply_to_canvas<'a, F>(f: F, canvas_option: &'a mut Option<Canvas>, dimensions: Option<(u32, u32)>, data: &str) -> Result<&'a mut Canvas, CanvasError>
 290     where F: Fn(Canvas, &mut dyn Iterator<Item = u8>) -> Result<Canvas, CanvasError>
 291 {
 292     let canvas = match canvas_option.take() {
 293         Some(canvas) => match dimensions {
 294             Some(dimensions) => {
 295                 if dimensions == canvas.img.dimensions() {
 296                     Ok(canvas)
 297                 }
 298                 else {
 299                     Err(CanvasError::DimensionMismatch(canvas_option.insert(canvas).img.dimensions()))
 300                 }
 301             },
 302             None =>
 303                 Ok(canvas)
 304         },
 305         None => match dimensions {
 306             Some((dim_x, dim_y)) =>
 307                 Ok(Canvas::new(dim_x, dim_y)),
 308             None =>
 309                 Err(CanvasError::NotExists)
 310         }
 311     }?;
 312
 313     Ok(canvas_option.insert(f(canvas, percent_decode_str(data).into_iter().borrow_mut())?))
 314 }
 315
 316 fn make_png<F>(dim_x: u32, dim_y: u32, scale: u32, data: &mut dyn Iterator<Item = u8>, encode: F) -> Result<Cursor<Vec<u8>>, ImageError>
 317     where F: Fn(RgbImage, &mut dyn Iterator<Item = u8>) -> Result<RgbImage, ImageError>
 318 {
 319     // Image must not be larger than 1 megapixel
 320     if dim_x * dim_y * scale > 1048576 {
 321         return Err(ImageError::dimension_error())
 322     }
 323
 324     let img: RgbImage = encode(ImageBuffer::new(dim_x, dim_y), data)?;
 325     let cursor = image_to_cursor(img, scale)?;
 326     Ok(cursor)
 327 }
 328
 329 fn image_to_cursor(img: RgbImage, scale: u32) -> Result<Cursor<Vec<u8>>, ImageError> {
 330     let (dim_x, dim_y) = img.dimensions();
 331     let (dim_x, dim_y) = (dim_x * scale, dim_y * scale);
 332
 333     // Image must not be larger than 1 megapixel
 334     if dim_x * dim_y > 1048576 {
 335         return Err(ImageError::dimension_error())
 336     }
 337
 338     let mut cursor = Cursor::new(Vec::new());
 339     let img = resize(&img, dim_x, dim_y, FilterType::Nearest);
 340     write_buffer_with_format(&mut cursor, &img, dim_x, dim_y, ColorType::Rgb8, Png)?;
 341     Ok(cursor)
 342 }
 343
 344
 345 #[get("/gen/0/{data}")]
 346 async fn img_gen0(req: HttpRequest) -> Result<impl Responder> {
 347     let data = extract_data!(req, 3);
 348     let cursor = make_png(32, 32, 16, percent_decode_str(data).into_iter().borrow_mut(), rgb_encode)?;
 349     Ok(response_image!(cursor))
 350 }
 351
 352 #[get("/gen/1/{dim_x}/{dim_y}/{scale}/{data}")]
 353 async fn img_gen1(req: HttpRequest, path: web::Path<(u32, u32, u32)>) -> Result<impl Responder> {
 354     let (dim_x, dim_y, scale) = path.into_inner();
 355     let data = extract_data!(req, 6);
 356     let cursor = make_png(dim_x, dim_y, scale, percent_decode_str(data).into_iter().borrow_mut(), rgb_encode)?;
 357     Ok(response_image!(cursor))
 358 }
 359
 360 #[get("/gen/2/{dim_x}/{dim_y}/{scale}")]
 361 async fn img_gen2(req: HttpRequest, path: web::Path<(u32, u32, u32)>) -> Result<impl Responder> {
 362     let (dim_x, dim_y, scale) = path.into_inner();
 363     let data = extract_header!(req, "user-agent");
 364     let cursor = make_png(dim_x, dim_y, scale, &mut data.bytes(), rgb_encode)?;
 365     Ok(response_image!(cursor))
 366 }
 367
 368 #[get("/gen/3/{scale}")]
 369 async fn img_gen3(req: HttpRequest, path: web::Path<u32>) -> Result<impl Responder> {
 370     let scale = path.into_inner();
 371     let data = extract_header!(req, "user-agent");
 372     let rgbimg: RgbImage = rgb_encode(ImageBuffer::new(TIMEAVATAR_SIZE_U32, TIMEAVATAR_SIZE_U32), &mut data.bytes())?;
 373     let mut resimg: RgbImage = ImageBuffer::new(60 * TIMEAVATAR_SIZE_U32, 24 * TIMEAVATAR_SIZE_U32);
 374     let time = OffsetDateTime::now_utc().time();
 375     let (hour, minute): (i64, i64) = (time.hour().into(), time.minute().into());
 376     overlay(&mut resimg, &rgbimg, minute * TIMEAVATAR_SIZE_I64, hour * TIMEAVATAR_SIZE_I64);
 377     let cursor = image_to_cursor(resimg, scale)?;
 378     Ok(response_image!(cursor))
 379 }
 380
 381 #[get("/gen/4/{dim_x}/{dim_y}/{scale}/{wave_offset_x}/{wave_offset_y}/{amplitude}/{freq}/{run}/{wave_color}/{data}")]
 382 #[allow(clippy::type_complexity)]
 383 async fn img_gen4(req: HttpRequest, path: web::Path<(u32, u32, u32, u32, u32, f32, f32, u32)>) -> Result<impl Responder> {
 384     let (dim_x, dim_y, scale, wave_offset_x, wave_offset_y, amplitude, freq_base, run) = path.into_inner();
 385     let freq_base = freq_base / 1000.0;
 386     let wave_color = extract_color!(req, 11)?;
 387     let signal = &mut percent_decode_str(extract_data!(req, 12));
 388     let cursor = make_png(dim_x, dim_y, scale, signal,
 389         |img, signal| sine_encode(img, (wave_offset_x, wave_offset_y), amplitude, freq_base, run, wave_color, signal))?;
 390     Ok(response_image!(cursor))
 391 }
 392
 393 #[get("/gen/5/{dim_x}/{dim_y}/{scale}/{offset_x}/{offset_y}/{run}/{color}/{data}")]
 394 async fn img_gen5(req: HttpRequest, path: web::Path<(u32, u32, u32, u32, u32, u32)>) -> Result<impl Responder> {
 395     let (dim_x, dim_y, scale, offset_x, offset_y, run) = path.into_inner();
 396     let color = extract_color!(req, 9)?;
 397     let data = &mut percent_decode_str(extract_data!(req, 10));
 398     let cursor = make_png(dim_x, dim_y, scale, data,
 399         |img, data| offset_encode(img, (offset_x, offset_y), run, color, data))?;
 400     Ok(response_image!(cursor))
 401 }
 402
 403 #[get("/pgen/0/{data}")]
 404 async fn img_pgen0(req: HttpRequest, canvas0: web::Data<Arc<Mutex<Canvas0>>>) -> Result<impl Responder> {
 405     let data = extract_data!(req, 3);
 406     let scale = 16;
 407     let img: RgbImage = ({
 408         let canvas_option = &mut *canvas0.lock().unwrap();
 409         Ok(apply_to_canvas( |c, d| rgb_encode_to_canvas(c, d), &mut canvas_option.0, None, data)?.img.clone())
 410     } as Result<RgbImage, CanvasError>)?;
 411     let cursor = image_to_cursor(img, scale)?;
 412     Ok(response_image!(cursor))
 413 }
 414
 415 #[get("/pgen/1/{dim_x}/{dim_y}/{scale}/{data}")]
 416 async fn img_pgen1(req: HttpRequest, path: web::Path<(u32, u32, u32)>, canvas1: web::Data<Arc<Mutex<Canvas1>>>) -> Result<impl Responder> {
 417     let (dim_x, dim_y, scale) = path.into_inner();
 418     let data = extract_data!(req, 6);
 419     let img: RgbImage = ({
 420         let canvas_option = &mut *canvas1.lock().unwrap();
 421         Ok(apply_to_canvas( |c, d| rgb_encode_to_canvas(c, d), &mut canvas_option.0, Some((dim_x, dim_y)), data)?.img.clone())
 422     } as Result<RgbImage, CanvasError>)?;
 423     let cursor = image_to_cursor(img, scale)?;
 424     Ok(response_image!(cursor))
 425 }
 426
 427 #[get("/pgen/2/{dim_x}/{dim_y}/{scale}")]
 428 async fn img_pgen2(req: HttpRequest, path: web::Path<(u32, u32, u32)>, canvas1: web::Data<Arc<Mutex<Canvas1>>>) -> Result<impl Responder> {
 429     let (dim_x, dim_y, scale) = path.into_inner();
 430     let data = extract_header!(req, "user-agent");
 431     let img: RgbImage = ({
 432         let canvas_option = &mut *canvas1.lock().unwrap();
 433         Ok(apply_to_canvas( |c, d| rgb_encode_to_canvas(c, d), &mut canvas_option.0, Some((dim_x, dim_y)), data)?.img.clone())
 434     } as Result<RgbImage, CanvasError>)?;
 435     let cursor = image_to_cursor(img, scale)?;
 436     Ok(response_image!(cursor))
 437 }
 438
 439 #[get("/pgen/3/{scale}")]
 440 async fn img_pgen3(req: HttpRequest, path: web::Path<u32>, canvas2: web::Data<Arc<Mutex<Canvas2>>>) -> Result<impl Responder> {
 441     let scale = path.into_inner();
 442     let data = extract_header!(req, "user-agent");
 443     let time = OffsetDateTime::now_utc().time();
 444     let (hour, minute): (i64, i64) = (time.hour().into(), time.minute().into());
 445     let rgbimg: RgbImage = rgb_encode(ImageBuffer::new(TIMEAVATAR_SIZE_U32, TIMEAVATAR_SIZE_U32), &mut data.bytes())?;
 446     let resimg: RgbImage = ({
 447         let canvas_option = &mut *canvas2.lock().unwrap();
 448         let mut canvas = match canvas_option.0.take() {
 449             Some(canvas) => canvas,
 450             None => Canvas::new(60 * TIMEAVATAR_SIZE_U32, 24 * TIMEAVATAR_SIZE_U32)
 451         };
 452         overlay(&mut canvas.img, &rgbimg, minute * TIMEAVATAR_SIZE_I64, hour * TIMEAVATAR_SIZE_I64);
 453         Ok(canvas_option.0.insert(canvas).img.clone())
 454     } as Result<RgbImage, CanvasError>)?;
 455     let cursor = image_to_cursor(resimg, scale)?;
 456     Ok(response_image!(cursor))
 457 }
 458
 459 #[get("/pgen/4/{dim_x}/{dim_y}/{scale}/{wave_offset_x}/{wave_offset_y}/{amplitude}/{freq}/{run}/{wave_color}/{data}")]
 460 #[allow(clippy::type_complexity)]
 461 async fn img_pgen4(req: HttpRequest, path: web::Path<(u32, u32, u32, u32, u32, f32, f32, u32)>,
 462     canvas1: web::Data<Arc<Mutex<Canvas1>>>) -> Result<impl Responder>
 463 {
 464     let (dim_x, dim_y, scale, wave_offset_x, wave_offset_y, amplitude, freq_base, run) = path.into_inner();
 465     let freq_base = freq_base / 1000.0;
 466     let wave_color = extract_color!(req, 11)?;
 467     let data = extract_data!(req, 12);
 468     let img: RgbImage = ({
 469         let canvas_option = &mut *canvas1.lock().unwrap();
 470         Ok(apply_to_canvas(
 471             |mut canvas, signal| {
 472                 canvas.img = sine_encode(canvas.img, (wave_offset_x, wave_offset_y), amplitude, freq_base, run, wave_color, signal)?;
 473                 Ok(canvas)
 474             },
 475             &mut canvas_option.0, Some((dim_x, dim_y)), data)?.img.clone())
 476     } as Result<RgbImage, CanvasError>)?;
 477     let cursor = image_to_cursor(img, scale)?;
 478     Ok(response_image!(cursor))
 479 }
 480
 481 #[get("/pgen/5/{dim_x}/{dim_y}/{scale}/{offset_x}/{offset_y}/{run}/{color}/{data}")]
 482 async fn img_pgen5(req: HttpRequest, path: web::Path<(u32, u32, u32, u32, u32, u32)>,
 483     canvas1: web::Data<Arc<Mutex<Canvas1>>>) -> Result<impl Responder>
 484 {
 485     let (dim_x, dim_y, scale, offset_x, offset_y, run) = path.into_inner();
 486     let color = extract_color!(req, 9)?;
 487     let data = extract_data!(req, 10);
 488     let img: RgbImage = ({
 489         let canvas_option = &mut *canvas1.lock().unwrap();
 490         Ok(apply_to_canvas(
 491             |mut canvas, data| {
 492                 canvas.img = offset_encode(canvas.img, (offset_x, offset_y), run, color, data)?;
 493                 Ok(canvas)
 494             },
 495             &mut canvas_option.0, Some((dim_x, dim_y)), data)?.img.clone())
 496     } as Result<RgbImage, CanvasError>)?;
 497     let cursor = image_to_cursor(img, scale)?;
 498     Ok(response_image!(cursor))
 499 }
 500
 501 #[get("/pdrop/{canvas_id}")]
 502 async fn pdrop(canvas_id: web::Path<u8>,
 503     canvas0: web::Data<Arc<Mutex<Canvas0>>>,
 504     canvas1: web::Data<Arc<Mutex<Canvas1>>>,
 505     canvas2: web::Data<Arc<Mutex<Canvas2>>>) -> Result<impl Responder> {
 506
 507     let canvas_id = canvas_id.into_inner();
 508     match canvas_id {
 509         0 => canvas0.lock().unwrap().0.take(),
 510         1 => canvas1.lock().unwrap().0.take(),
 511         2 => canvas2.lock().unwrap().0.take(),
 512         _ => None
 513     }.ok_or(CanvasError::NotExists)?;
 514     Ok(HttpResponse::build(StatusCode::OK)
 515        .body(format!("Canvas {} dropped.", canvas_id)))
 516 }
 517
 518
 519 #[actix_web::main] // or #[tokio::main]
 520 async fn main() -> std::io::Result<()> {
 521     env_logger::builder()
 522         .filter_module("actix_web", LevelFilter::Info)
 523         .parse_default_env()
 524         .init();
 525
 526     let listenaddress = env::args().nth(1).unwrap_or_else(|| "127.0.0.1:8080".to_string());
 527     let canvas0 = Arc::new(Mutex::new(Canvas0(Some(Canvas::new(32, 32)))));
 528     let canvas1 = Arc::new(Mutex::new(Canvas1(None)));
 529     let canvas2 = Arc::new(Mutex::new(Canvas2(None)));
 530
 531     HttpServer::new(move || {
 532         App::new()
 533             .wrap(Logger::default())
 534             .service(greet)
 535             .service(img_gen0)
 536             .service(img_gen1)
 537             .service(img_gen2)
 538             .service(img_gen3)
 539             .service(img_gen4)
 540             .service(img_gen5)
 541             .service(img_pgen0)
 542             .service(img_pgen1)
 543             .service(img_pgen2)
 544             .service(img_pgen3)
 545             .service(img_pgen4)
 546             .service(img_pgen5)
 547             .service(pdrop)
 548             .app_data(web::Data::new(canvas0.clone()))
 549             .app_data(web::Data::new(canvas1.clone()))
 550             .app_data(web::Data::new(canvas2.clone()))
 551     })
 552     .bind(listenaddress)?
 553     .run()
 554     .await
 555 }