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use std::sync::{Arc, RwLock, RwLockReadGuard};
use std::time::Duration;
use serde::{Deserialize, Serialize};
use tokio::sync::Notify;
use netapp::endpoint::Endpoint;
use netapp::peering::fullmesh::FullMeshPeeringStrategy;
use netapp::NodeID;
use garage_util::config::Config;
use garage_util::data::*;
use garage_util::error::*;
use garage_util::persister::Persister;
use super::*;
use crate::rpc_helper::*;
use crate::system::*;
pub struct LayoutManager {
replication_factor: usize,
persist_cluster_layout: Persister<LayoutHistory>,
layout: Arc<RwLock<LayoutHistory>>,
pub(crate) change_notify: Arc<Notify>,
pub(crate) rpc_helper: RpcHelper,
system_endpoint: Arc<Endpoint<SystemRpc, System>>,
}
#[derive(Debug, Clone, Serialize, Deserialize, Default)]
pub struct LayoutStatus {
/// Cluster layout version
pub cluster_layout_version: u64,
/// Hash of cluster layout update trackers
// (TODO) pub cluster_layout_trackers_hash: Hash,
/// Hash of cluster layout staging data
pub cluster_layout_staging_hash: Hash,
}
impl LayoutManager {
pub fn new(
config: &Config,
node_id: NodeID,
system_endpoint: Arc<Endpoint<SystemRpc, System>>,
fullmesh: Arc<FullMeshPeeringStrategy>,
replication_factor: usize,
) -> Result<Arc<Self>, Error> {
let persist_cluster_layout: Persister<LayoutHistory> =
Persister::new(&config.metadata_dir, "cluster_layout");
let cluster_layout = match persist_cluster_layout.load() {
Ok(x) => {
if x.current().replication_factor != replication_factor {
return Err(Error::Message(format!(
"Prevous cluster layout has replication factor {}, which is different than the one specified in the config file ({}). The previous cluster layout can be purged, if you know what you are doing, simply by deleting the `cluster_layout` file in your metadata directory.",
x.current().replication_factor,
replication_factor
)));
}
x
}
Err(e) => {
info!(
"No valid previous cluster layout stored ({}), starting fresh.",
e
);
LayoutHistory::new(replication_factor)
}
};
let layout = Arc::new(RwLock::new(cluster_layout));
let change_notify = Arc::new(Notify::new());
let rpc_helper = RpcHelper::new(
node_id.into(),
fullmesh,
layout.clone(),
config.rpc_timeout_msec.map(Duration::from_millis),
);
Ok(Arc::new(Self {
replication_factor,
persist_cluster_layout,
layout,
change_notify,
system_endpoint,
rpc_helper,
}))
}
// ---- PUBLIC INTERFACE ----
pub fn status(&self) -> LayoutStatus {
let layout = self.layout();
LayoutStatus {
cluster_layout_version: layout.current().version,
cluster_layout_staging_hash: layout.staging_hash,
}
}
pub async fn update_cluster_layout(
self: &Arc<Self>,
layout: &LayoutHistory,
) -> Result<(), Error> {
self.handle_advertise_cluster_layout(layout).await?;
Ok(())
}
pub fn layout(&self) -> RwLockReadGuard<'_, LayoutHistory> {
self.layout.read().unwrap()
}
pub(crate) async fn pull_cluster_layout(self: &Arc<Self>, peer: Uuid) {
let resp = self
.rpc_helper
.call(
&self.system_endpoint,
peer,
SystemRpc::PullClusterLayout,
RequestStrategy::with_priority(PRIO_HIGH),
)
.await;
if let Ok(SystemRpc::AdvertiseClusterLayout(layout)) = resp {
let _: Result<_, _> = self.handle_advertise_cluster_layout(&layout).await;
}
}
// ---- INTERNALS ---
/// Save network configuration to disc
async fn save_cluster_layout(&self) -> Result<(), Error> {
let layout = self.layout.read().unwrap().clone(); // TODO: avoid cloning
self.persist_cluster_layout
.save_async(&layout)
.await
.expect("Cannot save current cluster layout");
Ok(())
}
fn merge_layout(&self, adv: &LayoutHistory) -> Option<LayoutHistory> {
let mut layout = self.layout.write().unwrap();
let prev_layout_check = layout.check().is_ok();
if !prev_layout_check || adv.check().is_ok() {
if layout.merge(adv) {
if prev_layout_check && layout.check().is_err() {
panic!("Merged two correct layouts and got an incorrect layout.");
}
return Some(layout.clone());
}
}
None
}
// ---- RPC HANDLERS ----
pub(crate) fn handle_advertise_status(self: &Arc<Self>, from: Uuid, status: &LayoutStatus) {
let local_status = self.status();
if status.cluster_layout_version > local_status.cluster_layout_version
|| status.cluster_layout_staging_hash != local_status.cluster_layout_staging_hash
{
tokio::spawn({
let this = self.clone();
async move { this.pull_cluster_layout(from).await }
});
}
}
pub(crate) fn handle_pull_cluster_layout(&self) -> SystemRpc {
let layout = self.layout.read().unwrap().clone(); // TODO: avoid cloning
SystemRpc::AdvertiseClusterLayout(layout)
}
pub(crate) async fn handle_advertise_cluster_layout(
self: &Arc<Self>,
adv: &LayoutHistory,
) -> Result<SystemRpc, Error> {
if adv.current().replication_factor != self.replication_factor {
let msg = format!(
"Received a cluster layout from another node with replication factor {}, which is different from what we have in our configuration ({}). Discarding the cluster layout we received.",
adv.current().replication_factor,
self.replication_factor
);
error!("{}", msg);
return Err(Error::Message(msg));
}
if let Some(new_layout) = self.merge_layout(adv) {
self.change_notify.notify_waiters();
tokio::spawn({
let this = self.clone();
async move {
if let Err(e) = this
.rpc_helper
.broadcast(
&this.system_endpoint,
SystemRpc::AdvertiseClusterLayout(new_layout),
RequestStrategy::with_priority(PRIO_HIGH),
)
.await
{
warn!("Error while broadcasting new cluster layout: {}", e);
}
}
});
self.save_cluster_layout().await?;
}
Ok(SystemRpc::Ok)
}
}
|
