stateknot 0.1.0-alpha.1

Durable agent orchestration for Rust
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
143
144
145
146
147
148
149
150
151
152
153
154

// Copyright 2026 StateKnot contributors
// SPDX-License-Identifier: Apache-2.0

use super::AgentWorkerError;
use std::time::Duration;

/// Finite process-local scheduling and shutdown bounds; no durable policy changes.
#[derive(Clone, Debug)]
pub struct AgentWorkerOptions {
    pub(super) slots: usize,
    pub(super) busy_delay: Duration,
    pub(super) idle_delay: Duration,
    pub(super) failure_delay: Duration,
    pub(super) tick_timeout: Duration,
    pub(super) drain_timeout: Duration,
    pub(super) probe_interval: Duration,
    pub(super) probe_timeout: Duration,
    pub(super) freshness: Duration,
}

impl Default for AgentWorkerOptions {
    fn default() -> Self {
        Self {
            slots: 4,
            busy_delay: Duration::from_millis(10),
            idle_delay: Duration::from_millis(250),
            failure_delay: Duration::from_secs(1),
            tick_timeout: Duration::from_secs(300),
            drain_timeout: Duration::from_secs(30),
            probe_interval: Duration::from_secs(10),
            probe_timeout: Duration::from_secs(5),
            freshness: Duration::from_secs(20),
        }
    }
}

impl AgentWorkerOptions {
    /// Sets 1..=64 slots, 100 ms..=1 h per tick and 10 ms..=5 min drain.
    pub fn with_execution_limits(
        mut self,
        slots: usize,
        tick: Duration,
        drain: Duration,
    ) -> Result<Self, AgentWorkerError> {
        if !(1..=64).contains(&slots)
            || !(Duration::from_millis(100)..=Duration::from_secs(3600)).contains(&tick)
            || !(Duration::from_millis(10)..=Duration::from_secs(300)).contains(&drain)
        {
            return Err(AgentWorkerError::InvalidOptions);
        }
        self.slots = slots;
        self.tick_timeout = tick;
        self.drain_timeout = drain;
        Ok(self)
    }

    /// Sets positive 10 ms..=60 s delays after busy, idle/scan-limit, failed ticks.
    pub fn with_pacing(
        mut self,
        busy: Duration,
        idle: Duration,
        failure: Duration,
    ) -> Result<Self, AgentWorkerError> {
        if [busy, idle, failure]
            .iter()
            .any(|delay| !(Duration::from_millis(10)..=Duration::from_secs(60)).contains(delay))
        {
            return Err(AgentWorkerError::InvalidOptions);
        }
        self.busy_delay = busy;
        self.idle_delay = idle;
        self.failure_delay = failure;
        Ok(self)
    }

    /// Single-flight probes: 50 ms..=60 s between completions, 10 ms..=30 s
    /// whole-check timeout, freshness at least their sum and at most 120 s.
    pub fn with_readiness_limits(
        mut self,
        interval: Duration,
        timeout: Duration,
        freshness: Duration,
    ) -> Result<Self, AgentWorkerError> {
        if !(Duration::from_millis(50)..=Duration::from_secs(60)).contains(&interval)
            || !(Duration::from_millis(10)..=Duration::from_secs(30)).contains(&timeout)
            || freshness > Duration::from_secs(120)
            || freshness < interval + timeout
        {
            return Err(AgentWorkerError::InvalidOptions);
        }
        self.probe_interval = interval;
        self.probe_timeout = timeout;
        self.freshness = freshness;
        Ok(self)
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    #[test]
    fn all_bounds_are_finite_and_nonzero() {
        let ms = Duration::from_millis;
        for slots in [0, 65, usize::MAX] {
            assert!(
                AgentWorkerOptions::default()
                    .with_execution_limits(slots, ms(100), ms(10))
                    .is_err()
            );
        }
        assert!(
            AgentWorkerOptions::default()
                .with_execution_limits(64, ms(100), ms(10))
                .is_ok()
        );
        assert!(
            AgentWorkerOptions::default()
                .with_execution_limits(1, ms(99), ms(10))
                .is_err()
        );
        assert!(
            AgentWorkerOptions::default()
                .with_execution_limits(1, Duration::MAX, ms(10))
                .is_err()
        );
        assert!(
            AgentWorkerOptions::default()
                .with_execution_limits(1, ms(100), ms(0))
                .is_err()
        );
        for delays in [(0, 10, 10), (10, 0, 10), (10, 10, 0), (60001, 10, 10)] {
            assert!(
                AgentWorkerOptions::default()
                    .with_pacing(ms(delays.0), ms(delays.1), ms(delays.2))
                    .is_err()
            );
        }
        assert!(
            AgentWorkerOptions::default()
                .with_readiness_limits(ms(50), ms(10), ms(59))
                .is_err()
        );
        assert!(
            AgentWorkerOptions::default()
                .with_readiness_limits(ms(50), ms(10), ms(60))
                .is_ok()
        );
        assert!(
            AgentWorkerOptions::default()
                .with_readiness_limits(Duration::MAX, ms(10), Duration::MAX)
                .is_err()
        );
    }
}