peerman 0.1.8

DN42 peer manager with WireGuard, BIRD, and cluster support
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 crate::models::community::CommunityRuleRepository;
use crate::models::peer::Peer;
use crate::models::probe::ProbeResultRepository;

pub struct CommunityMapper;

impl CommunityMapper {
    /// Compute which community tags match a peer based on the latest probe
    /// result between the local node and the peer's origin node.
    ///
    /// Matching is 3-dimensional: latency, bandwidth, crypto weight.
    pub async fn compute_communities(
        peer: &Peer,
        local_node_id: &str,
        probe_repo: &ProbeResultRepository,
        rule_repo: &CommunityRuleRepository,
    ) -> Result<(Vec<String>, Vec<String>), crate::error::AppError> {
        let rules = rule_repo.list_enabled().await?;
        Self::compute_communities_with_rules(peer, local_node_id, probe_repo, &rules).await
    }

    /// Compute communities with pre-fetched rules (avoids N+1 queries).
    pub async fn compute_communities_with_rules(
        peer: &Peer,
        local_node_id: &str,
        probe_repo: &ProbeResultRepository,
        rules: &[crate::models::community::CommunityRule],
    ) -> Result<(Vec<String>, Vec<String>), crate::error::AppError> {
        let origin_node_id = peer.origin_node_id.as_deref().unwrap_or(local_node_id);

        let (latency, loss_pct) = if origin_node_id == local_node_id {
            (0.0, 0.0)
        } else {
            match probe_repo
                .latest_between(local_node_id, origin_node_id)
                .await?
            {
                Some(probe) => (probe.avg_latency_ms, probe.packet_loss_pct),
                None => return Ok((Vec::new(), Vec::new())),
            }
        };

        let crypto_weight: i32 = if peer.wg_private_key.is_some() { 1 } else { 0 };

        let mut v4 = Vec::new();
        let mut v6 = Vec::new();

        for rule in rules {
            if !rule.enabled {
                continue;
            }
            let lat_ok = rule.max_latency_ms <= 0.0 || latency <= rule.max_latency_ms;
            let loss_ok = loss_pct <= rule.max_packet_loss_pct;
            let bw_ok = true; // Bandwidth probing not yet implemented; skip check
            let crypto_ok = rule.crypto_weight == 0 || crypto_weight >= rule.crypto_weight;

            if lat_ok && loss_ok && bw_ok && crypto_ok {
                v4.push(rule.community_ipv4.clone());
                v6.push(rule.community_ipv6.clone());
            }
        }

        Ok((v4, v6))
    }

    /// Generate BIRD export filter lines for community tags.
    pub fn to_bird_filter_lines(communities_v4: &[String], communities_v6: &[String]) -> String {
        let mut lines = String::new();

        if !communities_v4.is_empty() {
            lines.push_str("    ipv4 {\n        export filter {\n");
            for c in communities_v4 {
                lines.push_str(&format!("            bgp_community.add(({}));\n", c));
            }
            lines.push_str("            accept;\n        };\n    };\n");
        }

        if !communities_v6.is_empty() {
            lines.push_str("    ipv6 {\n        export filter {\n");
            for c in communities_v6 {
                lines.push_str(&format!("            bgp_community.add(({}));\n", c));
            }
            lines.push_str("            accept;\n        };\n    };\n");
        }

        lines
    }

    /// Map latency (ms) to DN42 community tier (1-5).
    #[allow(dead_code)]
    pub fn latency_to_tier(latency_ms: f64) -> i32 {
        if latency_ms <= 5.0 {
            1
        } else if latency_ms <= 20.0 {
            2
        } else if latency_ms <= 50.0 {
            3
        } else if latency_ms <= 150.0 {
            4
        } else {
            5
        }
    }

    /// Extract the numeric tier from a community string like "4242420000,10".
    #[allow(dead_code)]
    pub fn parse_community_tier(community: &str) -> i32 {
        community
            .split(',')
            .nth(1)
            .and_then(|s| s.parse::<i32>().ok())
            .unwrap_or(0)
    }

    /// Extract the best (lowest) latency tier from a list of community strings.
    #[allow(dead_code)]
    pub fn best_latency_tier(communities: &[String]) -> i32 {
        communities
            .iter()
            .map(|c| Self::parse_community_tier(c))
            .min()
            .unwrap_or(0)
    }
}

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

    #[test]
    fn test_latency_to_tier_metro() {
        assert_eq!(CommunityMapper::latency_to_tier(3.0), 1);
    }

    #[test]
    fn test_latency_to_tier_regional() {
        assert_eq!(CommunityMapper::latency_to_tier(15.0), 2);
    }

    #[test]
    fn test_latency_to_tier_continental() {
        assert_eq!(CommunityMapper::latency_to_tier(35.0), 3);
    }

    #[test]
    fn test_latency_to_tier_intercontinental() {
        assert_eq!(CommunityMapper::latency_to_tier(100.0), 4);
    }

    #[test]
    fn test_latency_to_tier_high() {
        assert_eq!(CommunityMapper::latency_to_tier(200.0), 5);
    }

    #[test]
    fn test_parse_community_tier() {
        assert_eq!(CommunityMapper::parse_community_tier("4242420000,10"), 10);
        assert_eq!(CommunityMapper::parse_community_tier("4242420000,620"), 620);
    }

    #[test]
    fn test_parse_community_tier_invalid() {
        assert_eq!(CommunityMapper::parse_community_tier("invalid"), 0);
    }
}