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

use itertools::Itertools;
use ratatui::{
    prelude::*,
    widgets::{canvas::*, *},
};

use crate::{layout, RgbSwatch, THEME};

#[derive(Debug)]
pub struct TracerouteTab {
    selected_row: usize,
}

impl TracerouteTab {
    pub fn new(selected_row: usize) -> Self {
        Self {
            selected_row: selected_row % HOPS.len(),
        }
    }
}

impl Widget for TracerouteTab {
    fn render(self, area: Rect, buf: &mut Buffer) {
        RgbSwatch.render(area, buf);
        let area = area.inner(&Margin {
            vertical: 1,
            horizontal: 2,
        });
        Clear.render(area, buf);
        Block::new().style(THEME.content).render(area, buf);
        let area = Layout::default()
            .direction(Direction::Horizontal)
            .constraints([Constraint::Ratio(1, 2), Constraint::Ratio(1, 2)])
            .split(area);
        let left_area = layout(area[0], Direction::Vertical, vec![0, 3]);
        render_hops(self.selected_row, left_area[0], buf);
        render_ping(self.selected_row, left_area[1], buf);
        render_map(self.selected_row, area[1], buf);
    }
}

fn render_hops(selected_row: usize, area: Rect, buf: &mut Buffer) {
    let mut state = TableState::default().with_selected(Some(selected_row));
    let rows = HOPS
        .iter()
        .map(|hop| Row::new(vec![hop.host, hop.address]))
        .collect_vec();
    let block = Block::default()
        .title("Traceroute bad.horse".bold().white())
        .title_alignment(Alignment::Center)
        .padding(Padding::new(1, 1, 1, 1));
    StatefulWidget::render(
        Table::new(rows, [Constraint::Max(100), Constraint::Length(15)])
            .header(Row::new(vec!["Host", "Address"]).set_style(THEME.traceroute.header))
            .highlight_style(THEME.traceroute.selected)
            .block(block),
        area,
        buf,
        &mut state,
    );
    let mut scrollbar_state = ScrollbarState::default()
        .content_length(HOPS.len())
        .position(selected_row);
    let area = Rect {
        width: area.width + 1,
        y: area.y + 3,
        height: area.height - 4,
        ..area
    };
    Scrollbar::default()
        .orientation(ScrollbarOrientation::VerticalLeft)
        .begin_symbol(None)
        .end_symbol(None)
        .track_symbol(None)
        .thumb_symbol("▌")
        .render(area, buf, &mut scrollbar_state);
}

pub fn render_ping(progress: usize, area: Rect, buf: &mut Buffer) {
    let mut data = [
        8, 8, 8, 8, 7, 7, 7, 6, 6, 5, 4, 3, 3, 2, 2, 1, 1, 1, 2, 2, 3, 4, 5, 6, 7, 7, 8, 8, 8, 7,
        7, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 2, 4, 6, 7, 8, 8, 8, 8, 6, 4, 2, 1, 1, 1, 1, 2, 2, 2, 3,
        3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7,
    ];
    let mid = progress % data.len();
    data.rotate_left(mid);
    Sparkline::default()
        .block(
            Block::new()
                .title("Ping")
                .title_alignment(Alignment::Center)
                .border_type(BorderType::Thick),
        )
        .data(&data)
        .style(THEME.traceroute.ping)
        .render(area, buf);
}

fn render_map(selected_row: usize, area: Rect, buf: &mut Buffer) {
    let theme = THEME.traceroute.map;
    let path: Option<(&Hop, &Hop)> = HOPS.iter().tuple_windows().nth(selected_row);
    let map = Map {
        resolution: canvas::MapResolution::High,
        color: theme.color,
    };
    Canvas::default()
        .background_color(theme.background_color)
        .block(
            Block::new()
                .padding(Padding::new(1, 0, 1, 0))
                .style(theme.style),
        )
        .marker(Marker::HalfBlock)
        // picked to show Australia for the demo as it's the most interesting part of the map
        // (and the only part with hops ;))
        .x_bounds([112.0, 155.0])
        .y_bounds([-46.0, -11.0])
        .paint(|context| {
            context.draw(&map);
            if let Some(path) = path {
                context.draw(&canvas::Line::new(
                    path.0.location.0,
                    path.0.location.1,
                    path.1.location.0,
                    path.1.location.1,
                    theme.path,
                ));
                context.draw(&Points {
                    color: theme.source,
                    coords: &[path.0.location], // sydney
                });
                context.draw(&Points {
                    color: theme.destination,
                    coords: &[path.1.location], // perth
                });
            }
        })
        .render(area, buf);
}

#[derive(Debug)]
struct Hop {
    host: &'static str,
    address: &'static str,
    location: (f64, f64),
}

impl Hop {
    const fn new(name: &'static str, address: &'static str, location: (f64, f64)) -> Self {
        Self {
            host: name,
            address,
            location,
        }
    }
}

const CANBERRA: (f64, f64) = (149.1, -35.3);
const SYDNEY: (f64, f64) = (151.1, -33.9);
const MELBOURNE: (f64, f64) = (144.9, -37.8);
const PERTH: (f64, f64) = (115.9, -31.9);
const DARWIN: (f64, f64) = (130.8, -12.4);
const BRISBANE: (f64, f64) = (153.0, -27.5);
const ADELAIDE: (f64, f64) = (138.6, -34.9);

// Go traceroute bad.horse some time, it's fun. these locations are made up and don't correspond
// to the actual IP addresses (which are in Toronto, Canada).
const HOPS: &[Hop] = &[
    Hop::new("home", "127.0.0.1", CANBERRA),
    Hop::new("bad.horse", "162.252.205.130", SYDNEY),
    Hop::new("bad.horse", "162.252.205.131", MELBOURNE),
    Hop::new("bad.horse", "162.252.205.132", BRISBANE),
    Hop::new("bad.horse", "162.252.205.133", SYDNEY),
    Hop::new("he.rides.across.the.nation", "162.252.205.134", PERTH),
    Hop::new("the.thoroughbred.of.sin", "162.252.205.135", DARWIN),
    Hop::new("he.got.the.application", "162.252.205.136", BRISBANE),
    Hop::new("that.you.just.sent.in", "162.252.205.137", ADELAIDE),
    Hop::new("it.needs.evaluation", "162.252.205.138", DARWIN),
    Hop::new("so.let.the.games.begin", "162.252.205.139", PERTH),
    Hop::new("a.heinous.crime", "162.252.205.140", BRISBANE),
    Hop::new("a.show.of.force", "162.252.205.141", CANBERRA),
    Hop::new("a.murder.would.be.nice.of.course", "162.252.205.142", PERTH),
    Hop::new("bad.horse", "162.252.205.143", MELBOURNE),
    Hop::new("bad.horse", "162.252.205.144", DARWIN),
    Hop::new("bad.horse", "162.252.205.145", MELBOURNE),
    Hop::new("he-s.bad", "162.252.205.146", PERTH),
    Hop::new("the.evil.league.of.evil", "162.252.205.147", BRISBANE),
    Hop::new("is.watching.so.beware", "162.252.205.148", DARWIN),
    Hop::new("the.grade.that.you.receive", "162.252.205.149", PERTH),
    Hop::new("will.be.your.last.we.swear", "162.252.205.150", ADELAIDE),
    Hop::new("so.make.the.bad.horse.gleeful", "162.252.205.151", SYDNEY),
    Hop::new("or.he-ll.make.you.his.mare", "162.252.205.152", MELBOURNE),
    Hop::new("o_o", "162.252.205.153", BRISBANE),
    Hop::new("you-re.saddled.up", "162.252.205.154", DARWIN),
    Hop::new("there-s.no.recourse", "162.252.205.155", PERTH),
    Hop::new("it-s.hi-ho.silver", "162.252.205.156", SYDNEY),
    Hop::new("signed.bad.horse", "162.252.205.157", CANBERRA),
];