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Refactor health check and add ability to return it in json

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This commit is contained in:
Alex Auvolat 2022-12-05 15:28:57 +01:00
parent 2065f011ca
commit 280d1be7b1
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GPG Key ID: 0E496D15096376BE
7 changed files with 156 additions and 95 deletions
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95
src/api/admin/api_server.rs
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@ -1,4 +1,3 @@
use std::collections::HashMap;
use std::fmt::Write;
use std::net::SocketAddr;
use std::sync::Arc;
@ -17,8 +16,7 @@ use opentelemetry_prometheus::PrometheusExporter;
use prometheus::{Encoder, TextEncoder};
use garage_model::garage::Garage;
use garage_rpc::layout::NodeRoleV;
use garage_util::data::Uuid;
use garage_rpc::system::ClusterHealthStatus;
use garage_util::error::Error as GarageError;
use crate::generic_server::*;
@ -80,93 +78,62 @@ impl AdminApiServer {
.body(Body::empty())?)
}
fn handle_health(&self) -> Result<Response<Body>, Error> {
let ring: Arc<_> = self.garage.system.ring.borrow().clone();
let quorum = self.garage.replication_mode.write_quorum();
let replication_factor = self.garage.replication_mode.replication_factor();
fn handle_health(&self, format: Option<&str>) -> Result<Response<Body>, Error> {
let health = self.garage.system.health();
let nodes = self
.garage
.system
.get_known_nodes()
.into_iter()
.map(|n| (n.id, n))
.collect::<HashMap<Uuid, _>>();
let n_nodes_connected = nodes.iter().filter(|(_, n)| n.is_up).count();
let storage_nodes = ring
.layout
.roles
.items()
.iter()
.filter(|(_, _, v)| matches!(v, NodeRoleV(Some(r)) if r.capacity.is_some()))
.collect::<Vec<_>>();
let n_storage_nodes_ok = storage_nodes
.iter()
.filter(|(x, _, _)| nodes.get(x).map(|n| n.is_up).unwrap_or(false))
.count();
let partitions = ring.partitions();
let partitions_n_up = partitions
.iter()
.map(|(_, h)| {
let pn = ring.get_nodes(h, ring.replication_factor);
pn.iter()
.filter(|x| nodes.get(x).map(|n| n.is_up).unwrap_or(false))
.count()
})
.collect::<Vec<usize>>();
let n_partitions_full_ok = partitions_n_up
.iter()
.filter(|c| **c == replication_factor)
.count();
let n_partitions_quorum = partitions_n_up.iter().filter(|c| **c >= quorum).count();
let (status, status_str) = if n_partitions_quorum == partitions.len()
&& n_storage_nodes_ok == storage_nodes.len()
{
(StatusCode::OK, "Garage is fully operational")
} else if n_partitions_quorum == partitions.len() {
(
let (status, status_str) = match health.status {
ClusterHealthStatus::Healthy => (StatusCode::OK, "Garage is fully operational"),
ClusterHealthStatus::Degraded => (
StatusCode::OK,
"Garage is operational but some storage nodes are unavailable",
)
} else {
(
),
ClusterHealthStatus::Unavailable => (
StatusCode::SERVICE_UNAVAILABLE,
"Quorum is not available for some/all partitions, reads and writes will fail",
)
),
};
let resp = Response::builder().status(status);
if matches!(format, Some("json")) {
let resp_json =
serde_json::to_string_pretty(&health).map_err(garage_util::error::Error::from)?;
Ok(resp
.header(http::header::CONTENT_TYPE, "application/json")
.body(Body::from(resp_json))?)
} else {
let mut buf = status_str.to_string();
writeln!(
&mut buf,
"\nAll nodes: {} connected, {} known",
n_nodes_connected,
nodes.len()
health.connected_nodes, health.known_nodes,
)
.unwrap();
writeln!(
&mut buf,
"Storage nodes: {} connected, {} in layout",
n_storage_nodes_ok,
storage_nodes.len()
health.storage_nodes_ok, health.storage_nodes
)
.unwrap();
writeln!(&mut buf, "Number of partitions: {}", health.partitions).unwrap();
writeln!(
&mut buf,
"Partitions with quorum: {}",
health.partitions_quorum
)
.unwrap();
writeln!(&mut buf, "Number of partitions: {}", partitions.len()).unwrap();
writeln!(&mut buf, "Partitions with quorum: {}", n_partitions_quorum).unwrap();
writeln!(
&mut buf,
"Partitions with all nodes available: {}",
n_partitions_full_ok
health.partitions_all_ok
)
.unwrap();
Ok(Response::builder()
.status(status)
Ok(resp
.header(http::header::CONTENT_TYPE, "text/plain")
.body(Body::from(buf))?)
}
}
fn handle_metrics(&self) -> Result<Response<Body>, Error> {
#[cfg(feature = "metrics")]
@ -240,7 +207,7 @@ impl ApiHandler for AdminApiServer {
match endpoint {
Endpoint::Options => self.handle_options(&req),
Endpoint::Health => self.handle_health(),
Endpoint::Health { format } => self.handle_health(format.as_deref()),
Endpoint::Metrics => self.handle_metrics(),
Endpoint::GetClusterStatus => handle_get_cluster_status(&self.garage).await,
Endpoint::ConnectClusterNodes => handle_connect_cluster_nodes(&self.garage, req).await,

9
src/api/admin/router.rs
View File

@ -17,7 +17,9 @@ router_match! {@func
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum Endpoint {
Options,
Health,
Health {
format: Option<String>,
},
Metrics,
GetClusterStatus,
ConnectClusterNodes,
@ -90,7 +92,7 @@ impl Endpoint {
let res = router_match!(@gen_path_parser (req.method(), path, query) [
OPTIONS _ => Options,
GET "/health" => Health,
GET "/health" => Health (query_opt::format),
GET "/metrics" => Metrics,
GET "/v0/status" => GetClusterStatus,
POST "/v0/connect" => ConnectClusterNodes,
@ -133,7 +135,7 @@ impl Endpoint {
/// Get the kind of authorization which is required to perform the operation.
pub fn authorization_type(&self) -> Authorization {
match self {
Self::Health => Authorization::None,
Self::Health { .. } => Authorization::None,
Self::Metrics => Authorization::MetricsToken,
_ => Authorization::AdminToken,
}
@ -141,6 +143,7 @@ impl Endpoint {
}
generateQueryParameters! {
"format" => format,
"id" => id,
"search" => search,
"globalAlias" => global_alias,

9
src/model/garage.rs
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@ -8,10 +8,10 @@ use garage_util::background::*;
use garage_util::config::*;
use garage_util::error::*;
use garage_rpc::replication_mode::ReplicationMode;
use garage_rpc::system::System;
use garage_block::manager::*;
use garage_table::replication::ReplicationMode;
use garage_table::replication::TableFullReplication;
use garage_table::replication::TableShardedReplication;
use garage_table::*;
@ -167,12 +167,7 @@ impl Garage {
.expect("Invalid replication_mode in config file.");
info!("Initialize membership management system...");
let system = System::new(
network_key,
background.clone(),
replication_mode.replication_factor(),
&config,
)?;
let system = System::new(network_key, background.clone(), replication_mode, &config)?;
let data_rep_param = TableShardedReplication {
system: system.clone(),

1
src/rpc/lib.rs
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@ -9,6 +9,7 @@ mod consul;
mod kubernetes;
pub mod layout;
pub mod replication_mode;
pub mod ring;
pub mod system;

0
src/table/replication/mode.rs → src/rpc/replication_mode.rs
View File

99
src/rpc/system.rs
View File

@ -35,6 +35,7 @@ use crate::consul::ConsulDiscovery;
#[cfg(feature = "kubernetes-discovery")]
use crate::kubernetes::*;
use crate::layout::*;
use crate::replication_mode::*;
use crate::ring::*;
use crate::rpc_helper::*;
@ -102,6 +103,7 @@ pub struct System {
#[cfg(feature = "kubernetes-discovery")]
kubernetes_discovery: Option<KubernetesDiscoveryConfig>,
replication_mode: ReplicationMode,
replication_factor: usize,
/// The ring
@ -136,6 +138,37 @@ pub struct KnownNodeInfo {
pub status: NodeStatus,
}
#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
pub struct ClusterHealth {
/// The current health status of the cluster (see below)
pub status: ClusterHealthStatus,
/// Number of nodes already seen once in the cluster
pub known_nodes: usize,
/// Number of nodes currently connected
pub connected_nodes: usize,
/// Number of storage nodes declared in the current layout
pub storage_nodes: usize,
/// Number of storage nodes currently connected
pub storage_nodes_ok: usize,
/// Number of partitions in the layout
pub partitions: usize,
/// Number of partitions for which we have a quorum of connected nodes
pub partitions_quorum: usize,
/// Number of partitions for which all storage nodes are connected
pub partitions_all_ok: usize,
}
#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
pub enum ClusterHealthStatus {
/// All nodes are available
Healthy,
/// Some storage nodes are unavailable, but quorum is stil
/// achieved for all partitions
Degraded,
/// Quorum is not available for some partitions
Unavailable,
}
pub fn read_node_id(metadata_dir: &Path) -> Result<NodeID, Error> {
let mut pubkey_file = metadata_dir.to_path_buf();
pubkey_file.push("node_key.pub");
@ -200,9 +233,11 @@ impl System {
pub fn new(
network_key: NetworkKey,
background: Arc<BackgroundRunner>,
replication_factor: usize,
replication_mode: ReplicationMode,
config: &Config,
) -> Result<Arc<Self>, Error> {
let replication_factor = replication_mode.replication_factor();
let node_key =
gen_node_key(&config.metadata_dir).expect("Unable to read or generate node ID");
info!(
@ -324,6 +359,7 @@ impl System {
config.rpc_timeout_msec.map(Duration::from_millis),
),
system_endpoint,
replication_mode,
replication_factor,
rpc_listen_addr: config.rpc_bind_addr,
#[cfg(any(feature = "consul-discovery", feature = "kubernetes-discovery"))]
@ -429,6 +465,67 @@ impl System {
}
}
pub fn health(&self) -> ClusterHealth {
let ring: Arc<_> = self.ring.borrow().clone();
let quorum = self.replication_mode.write_quorum();
let replication_factor = self.replication_factor;
let nodes = self
.get_known_nodes()
.into_iter()
.map(|n| (n.id, n))
.collect::<HashMap<Uuid, _>>();
let connected_nodes = nodes.iter().filter(|(_, n)| n.is_up).count();
let storage_nodes = ring
.layout
.roles
.items()
.iter()
.filter(|(_, _, v)| matches!(v, NodeRoleV(Some(r)) if r.capacity.is_some()))
.collect::<Vec<_>>();
let storage_nodes_ok = storage_nodes
.iter()
.filter(|(x, _, _)| nodes.get(x).map(|n| n.is_up).unwrap_or(false))
.count();
let partitions = ring.partitions();
let partitions_n_up = partitions
.iter()
.map(|(_, h)| {
let pn = ring.get_nodes(h, ring.replication_factor);
pn.iter()
.filter(|x| nodes.get(x).map(|n| n.is_up).unwrap_or(false))
.count()
})
.collect::<Vec<usize>>();
let partitions_all_ok = partitions_n_up
.iter()
.filter(|c| **c == replication_factor)
.count();
let partitions_quorum = partitions_n_up.iter().filter(|c| **c >= quorum).count();
let status =
if partitions_quorum == partitions.len() && storage_nodes_ok == storage_nodes.len() {
ClusterHealthStatus::Healthy
} else if partitions_quorum == partitions.len() {
ClusterHealthStatus::Degraded
} else {
ClusterHealthStatus::Unavailable
};
ClusterHealth {
status,
known_nodes: nodes.len(),
connected_nodes,
storage_nodes: storage_nodes.len(),
storage_nodes_ok,
partitions: partitions.len(),
partitions_quorum,
partitions_all_ok,
}
}
// ---- INTERNALS ----
#[cfg(feature = "consul-discovery")]

2
src/table/replication/mod.rs
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@ -1,10 +1,8 @@
mod parameters;
mod fullcopy;
mod mode;
mod sharded;
pub use fullcopy::TableFullReplication;
pub use mode::ReplicationMode;
pub use parameters::*;
pub use sharded::TableShardedReplication;