forked from Deuxfleurs/garage
152 lines
4.1 KiB
Rust
152 lines
4.1 KiB
Rust
use garage_util::crdt::{Crdt, Lww, LwwMap};
|
|
use garage_util::data::*;
|
|
use garage_util::encode::nonversioned_encode;
|
|
use garage_util::error::*;
|
|
|
|
use super::schema::*;
|
|
use super::*;
|
|
|
|
impl LayoutHistory {
|
|
pub fn new(replication_factor: usize) -> Self {
|
|
let version = LayoutVersion::new(replication_factor);
|
|
|
|
let staging = LayoutStaging {
|
|
parameters: Lww::<LayoutParameters>::new(version.parameters),
|
|
roles: LwwMap::new(),
|
|
};
|
|
|
|
let mut ret = LayoutHistory {
|
|
versions: vec![version].into_boxed_slice().into(),
|
|
update_trackers: Default::default(),
|
|
trackers_hash: [0u8; 32].into(),
|
|
staging: Lww::raw(0, staging),
|
|
staging_hash: [0u8; 32].into(),
|
|
};
|
|
ret.update_hashes();
|
|
ret
|
|
}
|
|
|
|
pub fn current(&self) -> &LayoutVersion {
|
|
self.versions.last().as_ref().unwrap()
|
|
}
|
|
|
|
pub(crate) fn update_hashes(&mut self) {
|
|
self.trackers_hash = self.calculate_trackers_hash();
|
|
self.staging_hash = self.calculate_staging_hash();
|
|
}
|
|
|
|
pub(crate) fn calculate_trackers_hash(&self) -> Hash {
|
|
blake2sum(&nonversioned_encode(&self.update_trackers).unwrap()[..])
|
|
}
|
|
|
|
pub(crate) fn calculate_staging_hash(&self) -> Hash {
|
|
blake2sum(&nonversioned_encode(&self.staging).unwrap()[..])
|
|
}
|
|
|
|
// ================== updates to layout, public interface ===================
|
|
|
|
pub fn merge(&mut self, other: &LayoutHistory) -> bool {
|
|
let mut changed = false;
|
|
|
|
// Add any new versions to history
|
|
for v2 in other.versions.iter() {
|
|
if let Some(v1) = self.versions.iter().find(|v| v.version == v2.version) {
|
|
if v1 != v2 {
|
|
error!("Inconsistent layout histories: different layout compositions for version {}. Your cluster will be broken as long as this layout version is not replaced.", v2.version);
|
|
}
|
|
} else if self.versions.iter().all(|v| v.version != v2.version - 1) {
|
|
error!(
|
|
"Cannot receive new layout version {}, version {} is missing",
|
|
v2.version,
|
|
v2.version - 1
|
|
);
|
|
} else {
|
|
self.versions.push(v2.clone());
|
|
changed = true;
|
|
}
|
|
}
|
|
|
|
// Merge trackers
|
|
if self.update_trackers != other.update_trackers {
|
|
let c = self.update_trackers.merge(&other.update_trackers);
|
|
changed = changed || c;
|
|
}
|
|
|
|
// Merge staged layout changes
|
|
if self.staging != other.staging {
|
|
self.staging.merge(&other.staging);
|
|
changed = true;
|
|
}
|
|
|
|
// Update hashes if there are changes
|
|
if changed {
|
|
self.update_hashes();
|
|
}
|
|
|
|
changed
|
|
}
|
|
|
|
pub fn apply_staged_changes(mut self, version: Option<u64>) -> Result<(Self, Message), Error> {
|
|
match version {
|
|
None => {
|
|
let error = r#"
|
|
Please pass the new layout version number to ensure that you are writing the correct version of the cluster layout.
|
|
To know the correct value of the new layout version, invoke `garage layout show` and review the proposed changes.
|
|
"#;
|
|
return Err(Error::Message(error.into()));
|
|
}
|
|
Some(v) => {
|
|
if v != self.current().version + 1 {
|
|
return Err(Error::Message("Invalid new layout version".into()));
|
|
}
|
|
}
|
|
}
|
|
|
|
// Compute new version and add it to history
|
|
let mut new_version = self.current().clone();
|
|
new_version.version += 1;
|
|
|
|
new_version.roles.merge(&self.staging.get().roles);
|
|
new_version.roles.retain(|(_, _, v)| v.0.is_some());
|
|
new_version.parameters = *self.staging.get().parameters.get();
|
|
|
|
let msg = new_version.calculate_partition_assignment()?;
|
|
self.versions.push(new_version);
|
|
|
|
// Reset the staged layout changes
|
|
self.staging.update(LayoutStaging {
|
|
parameters: self.staging.get().parameters.clone(),
|
|
roles: LwwMap::new(),
|
|
});
|
|
self.update_hashes();
|
|
|
|
Ok((self, msg))
|
|
}
|
|
|
|
pub fn revert_staged_changes(mut self) -> Result<Self, Error> {
|
|
self.staging.update(LayoutStaging {
|
|
parameters: Lww::new(self.current().parameters.clone()),
|
|
roles: LwwMap::new(),
|
|
});
|
|
self.update_hashes();
|
|
|
|
Ok(self)
|
|
}
|
|
|
|
pub fn check(&self) -> Result<(), String> {
|
|
// Check that the hash of the staging data is correct
|
|
if self.trackers_hash != self.calculate_trackers_hash() {
|
|
return Err("trackers_hash is incorrect".into());
|
|
}
|
|
if self.staging_hash != self.calculate_staging_hash() {
|
|
return Err("staging_hash is incorrect".into());
|
|
}
|
|
|
|
for version in self.versions.iter() {
|
|
version.check()?;
|
|
}
|
|
|
|
// TODO: anythign more ?
|
|
Ok(())
|
|
}
|
|
}
|