1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at https://mozilla.org/MPL/2.0/.

mod error;
mod event;
mod http;
mod render;
use error::Error;
use http::Http;
use render::Render;
use serde::{Deserialize, Serialize};
use std::cmp;
use std::fs;
use std::str;
use std::sync::mpsc::{self, Receiver, Sender};
use termion::color::{Color, Fg, Green, Red, Reset as ColorReset, Yellow};
use termion::style::{Bold, Reset};

const PACMAN_MIRRORLIST: &str = "/etc/pacman.d/mirrorlist";
const MIRROR_STATUS_URI: &str = "https://www.archlinux.org/mirrors/status/";
const MIRROR_STATUS_JSON_URI: &str = "https://www.archlinux.org/mirrors/status/json/";
const OUTOFSYNC_HTML_TAG: &str = "<table id=\"outofsync_mirrors\"";
const INSYNC_HTML_TAG: &str = "<table id=\"successful_mirrors\"";
const OK: &str = "Ok";
const NOT_FOUND: &str = "Not found!";
const OUT_OF_SYNC: &str = "Out of sync!";
const HEADERS: [&str; 9] = [
    "State",
    "Url",
    "Protocol",
    "Country",
    "Completion %",
    "Delay h:m",
    "Avg dur s",
    "Dev dur s",
    "Score",
];

#[derive(Debug, Clone)]
pub enum MirrorState {
    NotFound(String),
    Synced(Mirror),
    OutOfSync(Mirror),
}

#[derive(Debug, Clone)]
pub struct Mirror {
    url: String,
    protocol: String,
    country: String,
    completion: Option<f64>,
    delay: Option<(u32, u32)>,
    duration_avg: Option<f64>,
    duration_stddev: Option<f64>,
    score: Option<f64>,
}

impl Mirror {
    fn completion_to_str(&self) -> String {
        if let Some(value) = self.completion {
            if (value - 100f64).abs() > f64::EPSILON {
                format!("{:.1}", value)
            } else {
                format!("{:.0}", value)
            }
        } else {
            "".to_string()
        }
    }

    fn delay_to_str(&self) -> String {
        if let Some(value) = self.delay {
            let (hour, minute) = value;
            format!("{:}:{:>02}", hour, minute)
        } else {
            "".to_string()
        }
    }

    fn duration_avg_to_str(&self) -> String {
        if let Some(value) = self.duration_avg {
            format!("{:.2}", value)
        } else {
            "".to_string()
        }
    }

    fn duration_stddev_to_str(&self) -> String {
        if let Some(value) = self.duration_stddev {
            format!("{:.2}", value)
        } else {
            "".to_string()
        }
    }

    fn score_to_str(&self) -> String {
        if let Some(value) = self.score {
            format!("{:.1}", value)
        } else {
            "".to_string()
        }
    }

    fn get_len(&self, field: &'static str) -> Result<usize, Error> {
        match field {
            "url" => Ok(self.url.len()),
            "protocol" => Ok(self.protocol.len()),
            "country" => Ok(self.country.len()),
            "completion" => Ok(self.completion_to_str().len()),
            "delay" => Ok(self.delay_to_str().len()),
            "duration_avg" => Ok(self.duration_avg_to_str().len()),
            "duration_stddev" => Ok(self.duration_stddev_to_str().len()),
            "score" => Ok(self.score_to_str().len()),
            _ => Err(Error::new(format!(
                "Mirror does not have a field \"{}\"",
                field
            ))),
        }
    }
}

impl From<&JsonMirror> for Mirror {
    fn from(json: &JsonMirror) -> Self {
        let completion = if let Some(completion) = json.completion_pct {
            Some(completion * 100f64)
        } else {
            None
        };
        let delay = if let Some(delay) = json.delay {
            let hours = delay as f64 / 3600_f64;
            let normalized_hours = hours.trunc() as u32;
            let minutes = (hours.fract() * 60_f64).trunc() as u32;
            Some((normalized_hours, minutes))
        } else {
            None
        };
        Mirror {
            url: String::from(&json.url),
            protocol: String::from(&json.protocol),
            country: String::from(&json.country),
            completion,
            delay,
            duration_avg: json.duration_avg,
            duration_stddev: json.duration_stddev,
            score: json.score,
        }
    }
}

#[derive(Serialize, Deserialize, Debug)]
struct JsonResponse {
    cutoff: u32,
    last_check: String,
    num_checks: u32,
    check_frequency: u32,
    urls: Vec<JsonMirror>,
    version: u32,
}

#[derive(Serialize, Deserialize, Debug, Clone)]
pub struct JsonMirror {
    url: String,
    protocol: String,
    country: String,
    country_code: String,
    completion_pct: Option<f64>,
    delay: Option<u32>,
    duration_avg: Option<f64>,
    duration_stddev: Option<f64>,
    score: Option<f64>,
    last_sync: Option<String>,
    active: bool,
    isos: bool,
    ipv4: bool,
    ipv6: bool,
    details: String,
}

struct MaxLength {
    state: usize,
    url: usize,
    protocol: usize,
    country: usize,
    completion: usize,
    delay: usize,
    duration_avg: usize,
    duration_stddev: usize,
    score: usize,
}

impl MaxLength {
    fn new(mirrors: &[MirrorState]) -> Result<Self, Error> {
        let state = cmp::max(find_max_state_len(mirrors), HEADERS[0].len());
        let url = cmp::max(find_max_len(mirrors, "url")?, HEADERS[1].len());
        let protocol = cmp::max(find_max_len(mirrors, "protocol")?, HEADERS[2].len());
        let country = cmp::max(find_max_len(mirrors, "country")?, HEADERS[3].len());
        let completion = cmp::max(find_max_len(mirrors, "completion")?, HEADERS[4].len());
        let delay = cmp::max(find_max_len(mirrors, "delay")?, HEADERS[5].len());
        let duration_avg = cmp::max(find_max_len(mirrors, "duration_avg")?, HEADERS[6].len());
        let duration_stddev = cmp::max(find_max_len(mirrors, "duration_stddev")?, HEADERS[7].len());
        let score = cmp::max(find_max_len(mirrors, "score")?, HEADERS[8].len());
        Ok(MaxLength {
            state,
            url,
            protocol,
            country,
            completion,
            delay,
            duration_avg,
            duration_stddev,
            score,
        })
    }
}

fn find_max_state_len(mirrors: &[MirrorState]) -> usize {
    let mut max_len = 0;
    for mirror_state in mirrors {
        match mirror_state {
            MirrorState::NotFound(_) => {
                if NOT_FOUND.len() > max_len {
                    max_len = NOT_FOUND.len();
                }
            }
            MirrorState::OutOfSync(_) => {
                if OUT_OF_SYNC.len() > max_len {
                    max_len = OUT_OF_SYNC.len();
                }
            }
            MirrorState::Synced(_) => {
                if OK.len() > max_len {
                    max_len = OK.len();
                }
            }
        }
    }
    max_len
}

fn find_max_len(mirrors: &[MirrorState], key: &'static str) -> Result<usize, Error> {
    let mut max_len = 0;
    for mirror_state in mirrors {
        match mirror_state {
            MirrorState::NotFound(server) => {
                if key == "url" && server.len() > max_len {
                    max_len = server.len();
                }
            }
            MirrorState::OutOfSync(mirror) => {
                let value = mirror.get_len(key)?;
                if value > max_len {
                    max_len = value;
                }
            }
            MirrorState::Synced(mirror) => {
                let value = mirror.get_len(key)?;
                if value > max_len {
                    max_len = value;
                }
            }
        }
    }
    Ok(max_len)
}

fn print_headers(max_len: &MaxLength) {
    println!(
        "{}{} {} {} {} {} {} {} {} {}{}",
        Bold,
        format!("{:>width$}", HEADERS[0], width = max_len.state),
        format!("{:<width$}", HEADERS[1], width = max_len.url),
        format!("{:<width$}", HEADERS[2], width = max_len.protocol),
        format!("{:<width$}", HEADERS[3], width = max_len.country),
        format!("{:>width$}", HEADERS[4], width = max_len.completion),
        format!("{:>width$}", HEADERS[5], width = max_len.delay),
        format!("{:>width$}", HEADERS[6], width = max_len.duration_avg),
        format!("{:>width$}", HEADERS[7], width = max_len.duration_stddev),
        format!("{:>width$}", HEADERS[8], width = max_len.score),
        Reset
    );
}

fn print_mirror<C: Color + Copy>(
    max_len: &MaxLength,
    mirror: &Mirror,
    state: &'static str,
    color: C,
) {
    let completion_color = if let Some(value) = mirror.completion {
        if value < 100f64 && value >= 95f64 {
            format!("{}", Fg(Yellow))
        } else if value < 95f64 {
            format!("{}", Fg(Red))
        } else {
            "".to_string()
        }
    } else {
        "".to_string()
    };
    let delay_color = if let Some(value) = mirror.delay {
        let (hours, minutes) = value;
        if hours > 0 {
            format!("{}", Fg(Red))
        } else if minutes > 30 {
            format!("{}", Fg(Yellow))
        } else {
            "".to_string()
        }
    } else {
        "".to_string()
    };
    let score_color = if let Some(value) = mirror.score {
        if value > 2f64 {
            format!("{}", Fg(Red))
        } else if value > 1f64 {
            format!("{}", Fg(Yellow))
        } else {
            "".to_string()
        }
    } else {
        "".to_string()
    };
    println!(
        "{} {} {} {} {} {} {} {} {}",
        format!(
            "{}{}{:>width$}{}",
            Bold,
            Fg(color),
            state,
            Reset,
            width = max_len.state
        ),
        format!("{:<width$}", mirror.url, width = max_len.url),
        format!("{:<width$}", mirror.protocol, width = max_len.protocol),
        format!("{:<width$}", mirror.country, width = max_len.country),
        format!(
            "{}{:>width$}{}",
            completion_color,
            mirror.completion_to_str(),
            Fg(ColorReset),
            width = max_len.completion,
        ),
        format!(
            "{}{:>width$}{}",
            delay_color,
            mirror.delay_to_str(),
            Fg(ColorReset),
            width = max_len.delay
        ),
        format!(
            "{:>width$}",
            mirror.duration_avg_to_str(),
            width = max_len.duration_avg
        ),
        format!(
            "{:>width$}",
            mirror.duration_stddev_to_str(),
            width = max_len.duration_stddev
        ),
        format!(
            "{}{:>width$}{}",
            score_color,
            mirror.score_to_str(),
            Fg(ColorReset),
            width = max_len.score
        ),
    );
}

fn print_mirrors(mirrors: Vec<MirrorState>) -> Result<(), Error> {
    let max_lengths = MaxLength::new(&mirrors)?;
    print_headers(&max_lengths);
    for mirror_state in &mirrors {
        match mirror_state {
            MirrorState::NotFound(server) => {
                println!(
                    "{}{}{}{} {}",
                    Bold,
                    Fg(Yellow),
                    format!("{:>width$}", NOT_FOUND, width = max_lengths.state),
                    Reset,
                    server
                );
            }
            MirrorState::OutOfSync(mirror) => {
                print_mirror(&max_lengths, &mirror, OUT_OF_SYNC, Red);
            }
            MirrorState::Synced(mirror) => {
                print_mirror(&max_lengths, &mirror, OK, Green);
            }
        }
    }
    println!();
    Ok(())
}

fn parse_mirrorlist() -> Result<Vec<String>, String> {
    let mut mirrors = vec![];
    let mirrorlist = fs::read_to_string(PACMAN_MIRRORLIST).map_err(|err| {
        format!(
            "an error occured while reading the file {}: {}",
            PACMAN_MIRRORLIST, err
        )
    })?;
    for line in mirrorlist.lines() {
        if let Some(url) = line.strip_prefix("Server = ") {
            if line.ends_with("/$repo/os/$arch") {
                let end = url.len() - 14;
                mirrors.push(String::from(&url[..end]));
            } else if line.ends_with("/$repo/os/$arch/") {
                let end = url.len() - 15;
                mirrors.push(String::from(&url[..end]));
            } else {
                mirrors.push(String::from(url));
            }
        }
    }
    if mirrors.is_empty() {
        Err(format!("no server found in {}", PACMAN_MIRRORLIST))
    } else {
        Ok(mirrors)
    }
}

pub fn logic(
    tx: Sender<&'static str>,
    rx: Receiver<&'static str>,
    render: &mut Render,
) -> Result<Vec<MirrorState>, Error> {
    let mut mirrors = vec![];
    render.run(rx);
    tx.send("parsing local mirrorlist")?;
    let mirrorlist = parse_mirrorlist()?;
    tx.send("fetching mirror status list")?;
    let request = Http::get(MIRROR_STATUS_URI);
    let json_request = Http::get(MIRROR_STATUS_JSON_URI);
    let response = request.wait()?;
    let json_response = json_request.wait()?;
    tx.send("deserialize json data")?;
    let json: JsonResponse = serde_json::from_str(&json_response)
        .map_err(|err| format!("json response parsing failed: {}", err))?;
    tx.send("web scraping")?;
    let v: Vec<&str> = response.split("</table>").collect();
    if v.len() != 4 {
        return Err(Error::new("web scraping failed"));
    }
    if v[0].find(OUTOFSYNC_HTML_TAG).is_none() {
        return Err(Error::new("web scraping failed"));
    }
    if v[1].find(INSYNC_HTML_TAG).is_none() {
        return Err(Error::new("web scraping failed"));
    }
    tx.send("building data")?;
    for server in mirrorlist {
        if let Some(mirror) = json.urls.iter().find(|&mirror| mirror.url == server) {
            if let Some(_i) = v[0].find(&server) {
                mirrors.push(MirrorState::OutOfSync(Mirror::from(mirror)));
            } else {
                mirrors.push(MirrorState::Synced(Mirror::from(mirror)));
            }
        } else {
            mirrors.push(MirrorState::NotFound(server));
        }
    }
    tx.send("done")?;
    Ok(mirrors)
}

pub fn run() -> Result<(), Error> {
    let (tx, rx) = mpsc::channel();
    let mut render = Render::new();
    let tx_cloned = Sender::clone(&tx);
    match logic(tx_cloned, rx, &mut render) {
        Ok(mirrors) => {
            drop(tx);
            render.finish()?;
            print_mirrors(mirrors)?;
        }
        Err(err) => {
            drop(tx);
            render.finish()?;
            return Err(err);
        }
    }
    Ok(())
}