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//! /admin/stats: how this node is doing, in numbers.
use axum::{Json, extract::State};
use serde::Serialize;
use super::peers::EpochInfo;
use crate::state::AppState;
use crate::swarm::{members, stability, topology};
use crate::transport::traffic::PeerTraffic;
#[derive(Debug, Serialize)]
#[serde(rename_all = "camelCase")]
pub(crate) struct StatsResponse {
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,
}
#[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>) -> Json<StatsResponse> {
let node = state.stats.snapshot();
let (heads, tier) = {
let mut replica = state.doc.write().await;
let heads = replica.doc.get_heads().len();
(heads, members::tier(&replica.doc, state.local_id()))
};
let saved = state.stats.saved_size();
let (connected_fraction, observed) = stability::measured(&state);
Json(StatsResponse {
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(),
})
}
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