my-ci 0.0.1

Minimalist Local CICD
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

use anyhow::{Context, Result, anyhow, bail};
use bollard::Docker;
use bollard::container::{
    AttachContainerOptions, Config as ContainerConfig, CreateContainerOptions, LogOutput,
    RemoveContainerOptions, StartContainerOptions, WaitContainerOptions,
};
use bollard::models::HostConfig;
use futures_util::StreamExt;

use crate::config::{WorkflowConfig, WorkflowFile, image_tag};

pub async fn run_workflow(
    docker: &Docker,
    config: &WorkflowFile,
    wf: &WorkflowConfig,
) -> Result<()> {
    let image = image_tag(config, wf);
    let cmd = wf
        .command
        .clone()
        .ok_or_else(|| anyhow!("workflow '{}' has no command configured", wf.name))?;
    let env = if wf.env.is_empty() {
        None
    } else {
        Some(wf.env.clone())
    };
    let container_name = format!("my-ci-{}", wf.name);

    println!("Running '{}' as container '{}'", wf.name, container_name);

    let create = docker
        .create_container(
            Some(CreateContainerOptions {
                name: container_name.clone(),
                platform: None,
            }),
            ContainerConfig {
                image: Some(image.clone()),
                cmd: Some(cmd),
                env,
                host_config: Some(HostConfig {
                    auto_remove: Some(true),
                    ..Default::default()
                }),
                ..Default::default()
            },
        )
        .await;

    let id = match create {
        Ok(resp) => resp.id,
        Err(err) => {
            let _ = docker
                .remove_container(
                    &container_name,
                    Some(RemoveContainerOptions {
                        force: true,
                        ..Default::default()
                    }),
                )
                .await;
            let retried = docker
                .create_container(
                    Some(CreateContainerOptions {
                        name: container_name.clone(),
                        platform: None,
                    }),
                    ContainerConfig {
                        image: Some(image),
                        cmd: Some(wf.command.clone().unwrap_or_default()),
                        env: if wf.env.is_empty() {
                            None
                        } else {
                            Some(wf.env.clone())
                        },
                        host_config: Some(HostConfig {
                            auto_remove: Some(true),
                            ..Default::default()
                        }),
                        ..Default::default()
                    },
                )
                .await
                .with_context(|| format!("failed to create container after cleanup: {err}"))?;
            retried.id
        }
    };

    let mut attach_stream = docker
        .attach_container(
            &id,
            Some(AttachContainerOptions::<String> {
                stdout: Some(true),
                stderr: Some(true),
                stream: Some(true),
                logs: Some(true),
                stdin: Some(false),
                detach_keys: None,
            }),
        )
        .await
        .context("failed to attach to container logs")?;

    docker
        .start_container(&id, None::<StartContainerOptions<String>>)
        .await
        .context("failed to start container")?;

    while let Some(output) = attach_stream.output.next().await {
        let output = output.context("container attach stream failed")?;
        print_log_output(output);
    }

    let mut wait_stream = docker.wait_container(
        &id,
        Some(WaitContainerOptions {
            condition: "not-running",
        }),
    );

    if let Some(wait_result) = wait_stream.next().await {
        let status = wait_result.context("failed while waiting for container")?;
        if status.status_code != 0 {
            bail!(
                "workflow '{}' exited with status {}",
                wf.name,
                status.status_code
            );
        }
    }

    Ok(())
}

fn print_log_output(output: LogOutput) {
    match output {
        LogOutput::StdOut { message } | LogOutput::StdErr { message } => {
            print!("{}", String::from_utf8_lossy(&message))
        }
        LogOutput::StdIn { .. } | LogOutput::Console { .. } => {}
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use bytes::Bytes;

    #[test]
    fn print_log_output_handles_all_streams() {
        // Smoke test that all variants are accepted without panic.
        print_log_output(LogOutput::StdOut {
            message: Bytes::from_static(b"hello"),
        });
        print_log_output(LogOutput::StdErr {
            message: Bytes::from_static(b"err"),
        });
        print_log_output(LogOutput::StdIn {
            message: Bytes::from_static(b"in"),
        });
        print_log_output(LogOutput::Console {
            message: Bytes::from_static(b"console"),
        });
    }
}