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