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//! A list of generations on the server.
use crate::chunkid::ChunkId;
use crate::generation::{FinishedGeneration, GenId};
/// A list of generations on the server.
pub struct GenerationList {
list: Vec<FinishedGeneration>,
}
/// Possible errors from listing generations.
#[derive(Debug, thiserror::Error)]
pub enum GenerationListError {
/// Server doesn't know about a generation.
#[error("Unknown generation: {0}")]
UnknownGeneration(ChunkId),
}
impl GenerationList {
/// Create a new list of generations.
pub fn new(gens: Vec<FinishedGeneration>) -> Self {
let mut list = gens;
list.sort_by_cached_key(|gen| gen.ended().to_string());
Self { list }
}
/// Return an iterator over the generations.
pub fn iter(&self) -> impl Iterator<Item = &FinishedGeneration> {
self.list.iter()
}
/// Resolve a symbolic name of a generation into its identifier.
///
/// For example, "latest" refers to the latest backup, but needs
/// to be resolved into an actual, immutable id to actually be
/// restored.
pub fn resolve(&self, genref: &str) -> Result<GenId, GenerationListError> {
let gen = if self.list.is_empty() {
None
} else if genref == "latest" {
let i = self.list.len() - 1;
Some(self.list[i].clone())
} else {
let genref = GenId::from_chunk_id(genref.parse().unwrap());
let hits: Vec<FinishedGeneration> = self
.iter()
.filter(|gen| gen.id().as_chunk_id() == genref.as_chunk_id())
.cloned()
.collect();
if hits.len() == 1 {
Some(hits[0].clone())
} else {
None
}
};
match gen {
None => Err(GenerationListError::UnknownGeneration(ChunkId::recreate(
genref,
))),
Some(gen) => Ok(gen.id().clone()),
}
}
}
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