machi 1.0.0

Enterprise embeddable agent runtime kernel
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

//! Workflow resume: second run replays journaled host calls (no extra samples).
#![allow(
    clippy::print_stdout,
    clippy::print_stderr,
    clippy::expect_used,
    clippy::unwrap_used,
    clippy::indexing_slicing,
    clippy::missing_assert_message,
    unused_crate_dependencies,
    reason = "offline demo binary uses stdout and expect for setup"
)]

use std::sync::Arc;
use std::sync::atomic::{AtomicUsize, Ordering};

use async_trait::async_trait;
use machi::{
    InProcessHost, Journal, LlmSampler, MachiError, MockSampler, SampleRequest, SampleResponse,
    SessionHost, WorkflowOutcome, WorkflowRunParams, run_workflow_on_host,
};
use tokio::sync::mpsc;
use tokio_util::sync::CancellationToken;

struct CountMock {
    inner: MockSampler,
    calls: AtomicUsize,
}

#[async_trait]
impl LlmSampler for CountMock {
    async fn sample(&self, request: SampleRequest) -> Result<SampleResponse, MachiError> {
        self.calls.fetch_add(1, Ordering::SeqCst);
        self.inner.sample(request).await
    }
}

#[tokio::main]
async fn main() -> Result<(), String> {
    let dir = std::env::temp_dir().join(format!("machi-wf-resume-{}", std::process::id()));
    let _ = std::fs::create_dir_all(&dir);
    let journal_path = dir.join("journal.jsonl");

    let script = r#"
        let meta = #{ name: "resume-demo", description: "two agents" };
        let a = agent("first", #{ label: "a" });
        let b = agent("second", #{ label: "b" });
        complete(#{ a: a, b: b });
    "#;

    let sampler = Arc::new(CountMock {
        inner: MockSampler::new(),
        calls: AtomicUsize::new(0),
    });
    sampler.inner.push_text("out-a");
    sampler.inner.push_text("out-b");

    let host: Arc<dyn SessionHost> = Arc::new(InProcessHost::new(sampler.clone(), Vec::new()));
    let (tx, _rx) = mpsc::unbounded_channel();
    let outcome1 = run_workflow_on_host(
        Arc::clone(&host),
        WorkflowRunParams {
            script: script.into(),
            args: serde_json::json!({}),
            journal: Journal::new(Some(journal_path.clone())),
            host_tx: tx,
            cancel: CancellationToken::new(),
            max_ops: WorkflowRunParams::DEFAULT_MAX_OPS,
        },
        Some(16),
    )
    .await
    .map_err(|e| e.to_string())?;
    let calls_after_first = sampler.calls.load(Ordering::SeqCst);
    println!("first_run_sample_calls={calls_after_first}");
    if !matches!(outcome1, WorkflowOutcome::Completed { .. }) {
        return Err(format!("first run failed: {outcome1:?}"));
    }
    if calls_after_first != 2 {
        return Err(format!(
            "first run should sample twice, got {calls_after_first}"
        ));
    }

    let journal = Journal::load(journal_path).map_err(|e| e.to_string())?;
    println!("journal_entries={}", journal.len());
    let (tx2, _rx2) = mpsc::unbounded_channel();
    let outcome2 = run_workflow_on_host(
        host,
        WorkflowRunParams {
            script: script.into(),
            args: serde_json::json!({}),
            journal,
            host_tx: tx2,
            cancel: CancellationToken::new(),
            max_ops: WorkflowRunParams::DEFAULT_MAX_OPS,
        },
        Some(16),
    )
    .await
    .map_err(|e| e.to_string())?;
    let calls_after_resume = sampler.calls.load(Ordering::SeqCst);
    println!("resume_run_sample_calls_total={calls_after_resume}");
    println!(
        "resume_new_samples={}",
        calls_after_resume.saturating_sub(calls_after_first)
    );
    match outcome2 {
        WorkflowOutcome::Completed { result } => {
            println!("resume_outcome=completed");
            println!(
                "a_output={}",
                result
                    .get("a")
                    .and_then(|v| v.get("output"))
                    .and_then(|v| v.as_str())
                    .unwrap_or("")
            );
            println!(
                "b_output={}",
                result
                    .get("b")
                    .and_then(|v| v.get("output"))
                    .and_then(|v| v.as_str())
                    .unwrap_or("")
            );
        }
        other => return Err(format!("resume failed: {other:?}")),
    }
    if calls_after_resume != calls_after_first {
        return Err("resume must not re-sample".into());
    }
    println!("resume_ok=true");
    Ok(())
}