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|
//! /peers handlers.
use std::sync::Arc;
use axum::{
extract::{Path, Query, State},
http::StatusCode,
Json,
};
use serde::{Deserialize, Serialize};
use tokio::sync::Mutex;
use tokio::time::Instant;
use tracing::warn;
use utoipa::ToSchema;
use super::store_status;
use crate::peer::forgotten_path;
use crate::replica::Epoch;
use crate::state::{unix_millis, AppState, HelloState, Liveness, PeerMembership, PeerState};
use crate::store;
#[derive(Debug, Serialize, ToSchema)]
#[serde(rename_all = "lowercase")]
pub(crate) enum PeerLivenessStatus {
Active,
Dormant,
}
#[derive(Debug, Serialize, ToSchema)]
#[serde(rename_all = "camelCase")]
pub(crate) struct EpochInfo {
generation: u64,
/// Hex-encoded snapshot hash; all zeros for the genesis epoch.
id: String,
}
impl From<Epoch> for EpochInfo {
fn from(epoch: Epoch) -> Self {
Self {
generation: epoch.generation,
id: epoch.id_hex(),
}
}
}
#[derive(Debug, Serialize, ToSchema)]
#[serde(rename_all = "camelCase")]
pub(crate) struct PeerStatus {
public_key: String,
validated_cluster: Option<String>,
status: PeerLivenessStatus,
handshake_complete: bool,
last_seen_secs_ago: Option<u64>,
dormant_for_secs: Option<u64>,
has_pending_delivery: bool,
/// Epoch the peer last advertised; absent until it has sent a message.
epoch: Option<EpochInfo>,
/// Whether that epoch equals ours, i.e. whether we sync with this peer.
same_epoch: Option<bool>,
}
#[derive(Debug, Serialize, ToSchema)]
#[serde(rename_all = "camelCase")]
pub(crate) struct PeerListResponse {
local_epoch: EpochInfo,
peers: Vec<PeerStatus>,
}
#[derive(Debug, Deserialize)]
pub(crate) struct DeletePeerQuery {
#[serde(default)]
force: bool,
}
#[utoipa::path(
get,
path = "/peers",
tag = "Peers",
responses(
(
status = 200,
description = "Lists known peers and their local replication status",
body = PeerListResponse
)
)
)]
pub(crate) async fn list_peers(
State(state): State<AppState>,
) -> Result<Json<PeerListResponse>, StatusCode> {
let snapshot: Vec<(String, Arc<Mutex<PeerState>>)> = state
.peer_states
.read()
.await
.iter()
.map(|(pk, m)| (pk.clone(), Arc::clone(m)))
.collect();
let now = Instant::now();
let local_epoch = state.local_epoch();
let mut peers = Vec::with_capacity(snapshot.len());
for (public_key, peer_state_mutex) in snapshot {
let ps = peer_state_mutex.lock().await;
let (status, dormant_for_secs) = match ps.liveness {
Liveness::Active => (PeerLivenessStatus::Active, None),
Liveness::Dormant { since } => (
PeerLivenessStatus::Dormant,
Some(now.saturating_duration_since(since).as_secs()),
),
};
peers.push(PeerStatus {
public_key,
validated_cluster: match &ps.membership {
PeerMembership::Unknown => None,
PeerMembership::Member { cluster_id } => Some(cluster_id.clone()),
},
status,
handshake_complete: ps.hello_state == HelloState::Established,
last_seen_secs_ago: ps
.last_seen
.map(|t| now.saturating_duration_since(t).as_secs()),
dormant_for_secs,
has_pending_delivery: ps.pending_outbound_sync.is_some(),
epoch: ps.epoch.map(EpochInfo::from),
same_epoch: ps.epoch.map(|epoch| epoch == local_epoch),
});
}
peers.sort_by(|a, b| a.public_key.cmp(&b.public_key));
Ok(Json(PeerListResponse {
local_epoch: local_epoch.into(),
peers,
}))
}
#[utoipa::path(
delete,
path = "/peers/{peer}",
tag = "Peers",
params(
("peer" = String, Path, description = "Peer public key"),
("force" = Option<bool>, Query, description = "Also forget a peer that is currently alive; it returns on its next message")
),
responses(
(status = 204, description = "Cluster-wide forget recorded"),
(status = 400, description = "Not a public key, or the local node's own key"),
(status = 409, description = "Peer is alive; pass force=true"),
(status = 503, description = "Node is not ready")
)
)]
pub(crate) async fn delete_peer(
State(state): State<AppState>,
Path(peer): Path<String>,
Query(query): Query<DeletePeerQuery>,
) -> Result<StatusCode, StatusCode> {
if !state.is_ready().await {
return Err(StatusCode::SERVICE_UNAVAILABLE);
}
if peer.is_empty() || peer == state.local_id() {
return Err(StatusCode::BAD_REQUEST);
}
// Unknown locally is fine: other nodes may still know the peer.
if let Some(peer_state_mutex) = state.get_peer_state(&peer).await {
if peer_state_mutex
.lock()
.await
.is_alive(&state.timing, Instant::now())
&& !query.force
{
return Err(StatusCode::CONFLICT);
}
}
let record = serde_json::json!({ "at": unix_millis(), "by": state.local_id() });
let peer_clone = peer.clone();
state
.mutate_doc(move |doc| store::write_path(doc, &forgotten_path(&peer_clone), &record))
.await
.map_err(|e| store_status(e, "Failed to write forget record"))?;
if state.peer_states.write().await.remove(&peer).is_some() {
warn!(peer = %peer, "Peer forgotten cluster-wide by operator");
}
Ok(StatusCode::NO_CONTENT)
}
|
