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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
//! /admin/stats: how this node is doing, in numbers. JSON, or the Prometheus text
//! format when the client asks for it (`prometheus`).
mod prometheus;
use axum::{
Json,
extract::State,
http::{HeaderMap, header},
response::{IntoResponse, Response},
};
use serde::Serialize;
use super::peers::EpochInfo;
use crate::state::{AppState, Incidents};
use crate::swarm::{members, stability, topology};
use crate::transport::traffic::PeerTraffic;
#[derive(Debug, Serialize)]
#[serde(rename_all = "camelCase")]
pub(crate) struct StatsResponse {
public_key: String,
alias: Option<String>,
uptime_secs: u64,
ready: bool,
epoch: EpochInfo,
document: DocumentStats,
catch_up: CatchUpStats,
topology: TopologyStats,
stability: StabilityStats,
/// HELLO_REPLYs to an earlier run of ours, ignored.
stale_hello_replies: u64,
/// All peers together, including ones no longer listed in /peers.
traffic: PeerTraffic,
/// The peers listed in /peers together (a forgotten peer's are gone).
incidents: Incidents,
propagation: PropagationStats,
}
/// How long changes written elsewhere took from their commit there until applied here,
/// once caught up. Includes the clock skew between the writer and us.
#[derive(Debug, Serialize)]
#[serde(rename_all = "camelCase")]
struct PropagationStats {
count: u64,
sum_ms: u64,
/// Changes stamped later than our clock on arrival (writer's clock ahead).
ahead: u64,
/// Not cumulative; the last bucket has no bound.
buckets: Vec<PropagationBucket>,
}
#[derive(Debug, Serialize)]
#[serde(rename_all = "camelCase")]
struct PropagationBucket {
le_ms: Option<u64>,
count: u64,
}
#[derive(Debug, Serialize)]
#[serde(rename_all = "camelCase")]
struct DocumentStats {
heads: usize,
/// Most heads after applying a sync message (concurrent changes not yet merged).
max_heads: usize,
/// Size as saved (compressed): about what a joining node downloads. Measured in the
/// background, at least a minute apart (longer for large documents); absent until
/// first measured.
saved_bytes: Option<u64>,
/// How long ago `saved_bytes` was measured.
saved_bytes_secs_ago: Option<u64>,
/// How long the last measurement took (copy and save), in milliseconds.
saved_bytes_took_ms: Option<u64>,
}
#[derive(Debug, Serialize)]
#[serde(rename_all = "camelCase")]
struct CatchUpStats {
/// Catch-up sources chosen (more than one: it switched).
sources: u32,
/// Seconds from start until the initial sync was done; absent until then (and on
/// the genesis node).
done_after_secs: Option<f64>,
/// Sync payload received until then.
sync_bytes: Option<u64>,
}
#[derive(Debug, Serialize)]
#[serde(rename_all = "camelCase")]
struct TopologyStats {
k: usize,
/// Absent until ready with a member list.
view: Option<TopologyView>,
}
#[derive(Debug, Serialize)]
#[serde(rename_all = "camelCase")]
struct TopologyView {
/// Registered members, us included.
members: usize,
/// Members other than us not judged unreachable.
reachable: usize,
stable: usize,
neighbours: usize,
stable_neighbours: usize,
full_mesh: bool,
}
#[derive(Debug, Serialize)]
#[serde(rename_all = "camelCase")]
struct StabilityStats {
/// As published in the member registry.
tier: &'static str,
/// Fraction of the observed time (up to a day) with a live peer.
connected_fraction: f64,
observed_secs: u64,
}
/// `GET /admin/stats`.
pub(crate) async fn get_stats(State(state): State<AppState>, headers: HeaderMap) -> Response {
let stats = collect(&state).await;
let accept = headers
.get(header::ACCEPT)
.and_then(|value| value.to_str().ok());
if prometheus::wanted(accept) {
let body = prometheus::render(&state, &stats).await;
([(header::CONTENT_TYPE, prometheus::CONTENT_TYPE)], body).into_response()
} else {
Json(stats).into_response()
}
}
async fn collect(state: &AppState) -> StatsResponse {
let node = state.stats.snapshot();
let (heads, tier) = {
let replica = state.doc.read().await;
let heads = replica.heads().len();
(heads, members::tier(&replica.doc, state.local_id()))
};
let saved = state.stats.saved_size();
let (connected_fraction, observed) = stability::measured(state);
let mut incidents = Incidents::default();
let peers: Vec<_> = state.peer_states.read().await.values().cloned().collect();
for peer_state in peers {
incidents.add(&peer_state.lock().await.incidents);
}
StatsResponse {
public_key: state.local_id().to_owned(),
alias: state.alias.clone(),
uptime_secs: node.uptime.as_secs(),
ready: state.is_ready().await,
epoch: state.local_epoch().into(),
document: DocumentStats {
heads,
max_heads: node.max_heads.max(heads),
saved_bytes: saved.map(|s| s.bytes),
saved_bytes_secs_ago: saved.map(|s| s.at.elapsed().as_secs()),
saved_bytes_took_ms: saved.map(|s| s.took.as_millis() as u64),
},
catch_up: CatchUpStats {
sources: node.catch_up_sources,
done_after_secs: node.caught_up.map(|c| c.after.as_secs_f64()),
sync_bytes: node.caught_up.map(|c| c.sync_bytes),
},
topology: TopologyStats {
k: state.neighbours_k,
view: topology::summary(state).map(|s| TopologyView {
members: s.members,
reachable: s.reachable,
stable: s.stable,
neighbours: s.neighbours,
stable_neighbours: s.stable_neighbours,
full_mesh: s.full_mesh,
}),
},
stability: StabilityStats {
tier: tier.as_str(),
connected_fraction,
observed_secs: observed.as_secs(),
},
stale_hello_replies: node.stale_hello_replies,
traffic: state.traffic.total(),
incidents,
propagation: PropagationStats {
count: node.propagation.count,
sum_ms: node.propagation.sum_ms,
ahead: node.propagation.ahead,
buckets: node
.propagation
.buckets()
.map(|(le_ms, count)| PropagationBucket { le_ms, count })
.collect(),
},
}
}
|
