forked from Deuxfleurs/garage
82 lines
2.1 KiB
Rust
82 lines
2.1 KiB
Rust
use serde::{Deserialize, Serialize};
|
|
|
|
use garage_util::data::*;
|
|
|
|
use crate::crdt::CRDT;
|
|
|
|
/// Trait for partitionnable data
|
|
pub trait PartitionKey {
|
|
/// Get the key used to partition
|
|
fn hash(&self) -> Hash;
|
|
}
|
|
|
|
impl PartitionKey for String {
|
|
fn hash(&self) -> Hash {
|
|
blake2sum(self.as_bytes())
|
|
}
|
|
}
|
|
|
|
impl PartitionKey for Hash {
|
|
fn hash(&self) -> Hash {
|
|
self.clone()
|
|
}
|
|
}
|
|
|
|
/// Trait for sortable data
|
|
pub trait SortKey {
|
|
/// Get the key used to sort
|
|
fn sort_key(&self) -> &[u8];
|
|
}
|
|
|
|
impl SortKey for String {
|
|
fn sort_key(&self) -> &[u8] {
|
|
self.as_bytes()
|
|
}
|
|
}
|
|
|
|
impl SortKey for Hash {
|
|
fn sort_key(&self) -> &[u8] {
|
|
self.as_slice()
|
|
}
|
|
}
|
|
|
|
/// Trait for an entry in a table. It must be sortable and partitionnable.
|
|
pub trait Entry<P: PartitionKey, S: SortKey>:
|
|
CRDT + PartialEq + Clone + Serialize + for<'de> Deserialize<'de> + Send + Sync
|
|
{
|
|
/// Get the key used to partition
|
|
fn partition_key(&self) -> &P;
|
|
/// Get the key used to sort
|
|
fn sort_key(&self) -> &S;
|
|
|
|
/// Is the entry a tombstone? Default implementation always return false
|
|
fn is_tombstone(&self) -> bool {
|
|
false
|
|
}
|
|
}
|
|
|
|
/// Trait for the schema used in a table
|
|
pub trait TableSchema: Send + Sync {
|
|
/// The partition key used in that table
|
|
type P: PartitionKey + Clone + PartialEq + Serialize + for<'de> Deserialize<'de> + Send + Sync;
|
|
/// The sort key used int that table
|
|
type S: SortKey + Clone + Serialize + for<'de> Deserialize<'de> + Send + Sync;
|
|
/// They type for an entry in that table
|
|
type E: Entry<Self::P, Self::S>;
|
|
type Filter: Clone + Serialize + for<'de> Deserialize<'de> + Send + Sync;
|
|
|
|
// Action to take if not able to decode current version:
|
|
// try loading from an older version
|
|
/// Try migrating an entry from an older version
|
|
fn try_migrate(_bytes: &[u8]) -> Option<Self::E> {
|
|
None
|
|
}
|
|
|
|
// Updated triggers some stuff downstream, but it is not supposed to block or fail,
|
|
// as the update itself is an unchangeable fact that will never go back
|
|
// due to CRDT logic. Typically errors in propagation of info should be logged
|
|
// to stderr.
|
|
fn updated(&self, old: Option<Self::E>, new: Option<Self::E>);
|
|
|
|
fn matches_filter(entry: &Self::E, filter: &Self::Filter) -> bool;
|
|
}
|