Implement /health admin API endpoint to check node health
This commit is contained in:
Alex Auvolat
parent
243b7c9a1c
commit
2065f011ca
@ -1,3 +1,5 @@
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use std::collections::HashMap;
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use std::fmt::Write;
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use std::net::SocketAddr;
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use std::sync::Arc;
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@ -15,6 +17,8 @@ use opentelemetry_prometheus::PrometheusExporter;
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use prometheus::{Encoder, TextEncoder};
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use garage_model::garage::Garage;
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use garage_rpc::layout::NodeRoleV;
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use garage_util::data::Uuid;
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use garage_util::error::Error as GarageError;
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use crate::generic_server::*;
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@ -76,6 +80,94 @@ impl AdminApiServer {
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.body(Body::empty())?)
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}
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fn handle_health(&self) -> Result<Response<Body>, Error> {
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let ring: Arc<_> = self.garage.system.ring.borrow().clone();
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let quorum = self.garage.replication_mode.write_quorum();
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let replication_factor = self.garage.replication_mode.replication_factor();
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let nodes = self
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.garage
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.system
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.get_known_nodes()
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.into_iter()
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.map(|n| (n.id, n))
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.collect::<HashMap<Uuid, _>>();
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let n_nodes_connected = nodes.iter().filter(|(_, n)| n.is_up).count();
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let storage_nodes = ring
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.layout
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.roles
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.items()
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.iter()
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.filter(|(_, _, v)| matches!(v, NodeRoleV(Some(r)) if r.capacity.is_some()))
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.collect::<Vec<_>>();
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let n_storage_nodes_ok = storage_nodes
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.iter()
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.filter(|(x, _, _)| nodes.get(x).map(|n| n.is_up).unwrap_or(false))
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.count();
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let partitions = ring.partitions();
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let partitions_n_up = partitions
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.iter()
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.map(|(_, h)| {
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let pn = ring.get_nodes(h, ring.replication_factor);
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pn.iter()
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.filter(|x| nodes.get(x).map(|n| n.is_up).unwrap_or(false))
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.count()
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})
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.collect::<Vec<usize>>();
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let n_partitions_full_ok = partitions_n_up
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.iter()
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.filter(|c| **c == replication_factor)
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.count();
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let n_partitions_quorum = partitions_n_up.iter().filter(|c| **c >= quorum).count();
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let (status, status_str) = if n_partitions_quorum == partitions.len()
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&& n_storage_nodes_ok == storage_nodes.len()
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{
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(StatusCode::OK, "Garage is fully operational")
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} else if n_partitions_quorum == partitions.len() {
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(
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StatusCode::OK,
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"Garage is operational but some storage nodes are unavailable",
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)
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} else {
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(
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StatusCode::SERVICE_UNAVAILABLE,
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"Quorum is not available for some/all partitions, reads and writes will fail",
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)
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};
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let mut buf = status_str.to_string();
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writeln!(
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&mut buf,
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"\nAll nodes: {} connected, {} known",
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n_nodes_connected,
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nodes.len()
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)
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.unwrap();
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writeln!(
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&mut buf,
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"Storage nodes: {} connected, {} in layout",
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n_storage_nodes_ok,
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storage_nodes.len()
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)
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.unwrap();
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writeln!(&mut buf, "Number of partitions: {}", partitions.len()).unwrap();
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writeln!(&mut buf, "Partitions with quorum: {}", n_partitions_quorum).unwrap();
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writeln!(
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&mut buf,
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"Partitions with all nodes available: {}",
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n_partitions_full_ok
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)
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.unwrap();
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Ok(Response::builder()
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.status(status)
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.header(http::header::CONTENT_TYPE, "text/plain")
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.body(Body::from(buf))?)
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}
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fn handle_metrics(&self) -> Result<Response<Body>, Error> {
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#[cfg(feature = "metrics")]
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{
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@ -124,6 +216,7 @@ impl ApiHandler for AdminApiServer {
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) -> Result<Response<Body>, Error> {
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let expected_auth_header =
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match endpoint.authorization_type() {
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Authorization::None => None,
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Authorization::MetricsToken => self.metrics_token.as_ref(),
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Authorization::AdminToken => match &self.admin_token {
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None => return Err(Error::forbidden(
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@ -147,6 +240,7 @@ impl ApiHandler for AdminApiServer {
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match endpoint {
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Endpoint::Options => self.handle_options(&req),
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Endpoint::Health => self.handle_health(),
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Endpoint::Metrics => self.handle_metrics(),
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Endpoint::GetClusterStatus => handle_get_cluster_status(&self.garage).await,
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Endpoint::ConnectClusterNodes => handle_connect_cluster_nodes(&self.garage, req).await,
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@ -6,6 +6,7 @@ use crate::admin::error::*;
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use crate::router_macros::*;
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pub enum Authorization {
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None,
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MetricsToken,
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AdminToken,
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}
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@ -16,6 +17,7 @@ router_match! {@func
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub enum Endpoint {
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Options,
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Health,
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Metrics,
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GetClusterStatus,
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ConnectClusterNodes,
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@ -88,6 +90,7 @@ impl Endpoint {
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let res = router_match!(@gen_path_parser (req.method(), path, query) [
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OPTIONS _ => Options,
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GET "/health" => Health,
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GET "/metrics" => Metrics,
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GET "/v0/status" => GetClusterStatus,
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POST "/v0/connect" => ConnectClusterNodes,
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@ -130,6 +133,7 @@ impl Endpoint {
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/// Get the kind of authorization which is required to perform the operation.
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pub fn authorization_type(&self) -> Authorization {
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match self {
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Self::Health => Authorization::None,
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Self::Metrics => Authorization::MetricsToken,
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_ => Authorization::AdminToken,
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}
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@ -34,6 +34,9 @@ pub struct Garage {
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/// The parsed configuration Garage is running
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pub config: Config,
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/// The replication mode of this cluster
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pub replication_mode: ReplicationMode,
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/// The local database
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pub db: db::Db,
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/// A background job runner
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@ -258,6 +261,7 @@ impl Garage {
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// -- done --
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Ok(Arc::new(Self {
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config,
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replication_mode,
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db,
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background,
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system,
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@ -1,3 +1,4 @@
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#[derive(Clone, Copy)]
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pub enum ReplicationMode {
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None,
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TwoWay,
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