shep 0.18.2

The shep binary: a process manager that keeps a flock of long-running processes alive on macOS, Linux and Windows, with logs, watch and cron restarts, and webhook alerts
Documentation 
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

//! A Flockfile re-run and a sheep `shep disable` parked: the file never
//! brings it back, and the rest of the file still loads.

use super::*;

use shep_core::status::ProcStatus;

fn a_disabled_zam() -> ProcessInfo {
    ProcessInfo::builder(0, "zam", ProcStatus::Stopped)
        .disabled(Some(true))
        .build()
}

/// A fake shepherd holding `flock`, answering a `Start` with one online row
/// per app sent
fn a_shepherd_holding(flock: Vec<ProcessInfo>) -> impl Fn(&Request) -> Response + Send + 'static {
    move |request| match request {
        Request::ListFlock => Response::Flock(flock.clone()),
        Request::ApplyConfig { apps, .. } => Response::Applied(
            apps.iter()
                .map(|app| SheepApplied::new(app.config.name.clone(), Vec::new(), Vec::new(), None))
                .collect(),
        ),
        Request::Start { apps } => Response::Started(
            apps.iter()
                .zip(10..)
                .map(|(app, id)| {
                    ProcessInfo::builder(id, app.name.clone(), ProcStatus::Online).build()
                })
                .collect(),
        ),
        _ => Response::Pong,
    }
}

fn write_two_app_flockfile(dir: &Path) -> String {
    let flockfile = dir.join("Flockfile.toml");
    std::fs::write(
        &flockfile,
        "[[app]]\nname = \"zam\"\nscript = \"./srv\"\n\n[[app]]\nname = \"fresh\"\nscript = \"./new\"\n",
    )
    .unwrap();
    flockfile.to_str().unwrap().to_string()
}

/// fails if a re-run respawns a disabled sheep, stops before the file's new
/// app, or exits non-zero because it passed a sheep by
#[tokio::test]
async fn a_rerun_leaves_a_disabled_sheep_down_and_starts_the_new_app() {
    use shep_client::testing::fake_client_answering;

    let dir = tempfile::tempdir().unwrap();
    let flockfile = write_two_app_flockfile(dir.path());
    let path = shep_client::testing::control_address(dir.path());
    let (client, mut envelopes) =
        fake_client_answering(&path, a_shepherd_holding(vec![a_disabled_zam()])).await;

    let (code, _printed, said) = start_against(&client, &flockfile).await;

    assert_eq!(code, ExitCode::Success, "{said}");
    let mut respawned = Vec::new();
    let mut started = Vec::new();
    while let Ok(envelope) = envelopes.try_recv() {
        match envelope.body {
            Request::Restart { selector } => respawned.push(selector),
            Request::Start { apps } => {
                started.extend(apps.into_iter().map(|app| app.name));
            }
            _ => {}
        }
    }
    assert_eq!(respawned, Vec::new(), "the disabled sheep stays down");
    assert_eq!(started, vec!["fresh".to_string()], "the new app starts");
}

/// fails if the aside stops naming the verb that brings the sheep back
#[tokio::test]
async fn the_aside_names_shep_enable_for_each_sheep_passed_by() {
    use shep_client::testing::fake_client_answering;

    let dir = tempfile::tempdir().unwrap();
    let flockfile = write_two_app_flockfile(dir.path());
    let path = shep_client::testing::control_address(dir.path());
    let (client, _envelopes) =
        fake_client_answering(&path, a_shepherd_holding(vec![a_disabled_zam()])).await;

    let (_code, _printed, said) = start_against(&client, &flockfile).await;

    assert!(
        said.contains("zam is disabled") && said.contains("`shep enable zam`"),
        "the aside names the sheep and its remedy: {said}"
    );
}

/// fails if the pass-by leaks into a named start: `shep start zam` is an
/// operator request, which the shepherd refuses with the remedy
#[tokio::test]
async fn a_start_naming_a_disabled_sheep_still_reaches_the_shepherd() {
    use shep_client::testing::fake_client_answering;

    let dir = tempfile::tempdir().unwrap();
    let path = shep_client::testing::control_address(dir.path());
    let (client, mut envelopes) =
        fake_client_answering(&path, a_shepherd_holding(vec![a_disabled_zam()])).await;

    let (_code, _printed, _said) = start_against(&client, "zam").await;

    assert_eq!(respawns(&mut envelopes), vec![SelectorSpec::Id(0)]);
}

/// fails if a disabled row survives the filter, a live row is dropped, or
/// the aside stops naming `shep enable` for each sheep
#[test]
fn leaving_disabled_rows_out_keeps_the_rest_and_names_each_remedy() {
    use crate::commands::lifecycle::respawn::leave_disabled;

    let rows = vec![
        a_disabled_zam(),
        ProcessInfo::builder(1, "api", ProcStatus::Stopped).build(),
        ProcessInfo::builder(2, "web", ProcStatus::Stopped)
            .disabled(Some(true))
            .build(),
    ];
    let mut out = Vec::new();
    let mut err = Vec::new();
    let kept = {
        let mut streams = Streams::bare(&mut out, &mut err, Format::Table);
        leave_disabled(&mut streams, rows)
    };

    let kept_ids: Vec<u32> = kept.iter().map(|info| info.id).collect();
    assert_eq!(kept_ids, vec![1]);
    let said = String::from_utf8(err).unwrap();
    assert!(
        said.contains("`shep enable zam`") && said.contains("`shep enable web`"),
        "{said}"
    );
    assert!(
        !said.contains("api"),
        "a sheep left running is not mentioned: {said}"
    );
}