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use async_trait::async_trait;
use serde::{Deserialize, Serialize};
use garage_table::crdt::CRDT;
use garage_table::*;
use garage_util::error::Error;
use crate::key_table::PermissionSet;
// We import the same file but in its version 0.1.0.
// We can then access v0.1.0 data structures.
// We use them to perform migrations.
use model010::bucket_table as prev;
/// A bucket is a collection of objects
///
/// Its parameters are not directly accessible as:
/// - It must be possible to merge paramaters, hence the use of a LWW CRDT.
/// - A bucket has 2 states, Present or Deleted and parameters make sense only if present.
#[derive(PartialEq, Clone, Debug, Serialize, Deserialize)]
pub struct Bucket {
// Primary key
pub name: String,
pub state: crdt::LWW<BucketState>,
}
#[derive(PartialEq, Clone, Debug, Serialize, Deserialize)]
pub enum BucketState {
Deleted,
Present(BucketParams),
}
impl CRDT for BucketState {
fn merge(&mut self, o: &Self) {
match o {
BucketState::Deleted => *self = BucketState::Deleted,
BucketState::Present(other_params) => {
if let BucketState::Present(params) = self {
params.merge(other_params);
}
}
}
}
}
#[derive(PartialEq, Clone, Debug, Serialize, Deserialize)]
pub struct BucketParams {
pub authorized_keys: crdt::LWWMap<String, PermissionSet>,
pub website: crdt::LWW<bool>,
}
impl CRDT for BucketParams {
fn merge(&mut self, o: &Self) {
self.authorized_keys.merge(&o.authorized_keys);
self.website.merge(&o.website);
}
}
impl BucketParams {
pub fn new() -> Self {
BucketParams {
authorized_keys: crdt::LWWMap::new(),
website: crdt::LWW::new(false),
}
}
}
impl Bucket {
pub fn new(name: String) -> Self {
Bucket {
name,
state: crdt::LWW::new(BucketState::Present(BucketParams::new())),
}
}
pub fn is_deleted(&self) -> bool {
*self.state.get() == BucketState::Deleted
}
pub fn authorized_keys(&self) -> &[(String, u64, PermissionSet)] {
match self.state.get() {
BucketState::Deleted => &[],
BucketState::Present(state) => state.authorized_keys.items(),
}
}
}
impl Entry<EmptyKey, String> for Bucket {
fn partition_key(&self) -> &EmptyKey {
&EmptyKey
}
fn sort_key(&self) -> &String {
&self.name
}
fn merge(&mut self, other: &Self) {
self.state.merge(&other.state);
}
}
pub struct BucketTable;
#[async_trait]
impl TableSchema for BucketTable {
type P = EmptyKey;
type S = String;
type E = Bucket;
type Filter = DeletedFilter;
async fn updated(&self, _old: Option<Self::E>, _new: Option<Self::E>) -> Result<(), Error> {
Ok(())
}
fn matches_filter(entry: &Self::E, filter: &Self::Filter) -> bool {
filter.apply(entry.is_deleted())
}
fn try_migrate(bytes: &[u8]) -> Option<Self::E> {
let old = match rmp_serde::decode::from_read_ref::<_, prev::Bucket>(bytes) {
Ok(x) => x,
Err(_) => return None,
};
if old.deleted {
Some(Bucket {
name: old.name,
state: crdt::LWW::migrate_from_raw(old.timestamp, BucketState::Deleted),
})
} else {
let mut keys = crdt::LWWMap::new();
for ak in old.authorized_keys() {
keys.merge(&crdt::LWWMap::migrate_from_raw_item(
ak.key_id.clone(),
ak.timestamp,
PermissionSet {
allow_read: ak.allow_read,
allow_write: ak.allow_write,
},
));
}
let params = BucketParams {
authorized_keys: keys,
website: crdt::LWW::new(false),
};
Some(Bucket {
name: old.name,
state: crdt::LWW::migrate_from_raw(old.timestamp, BucketState::Present(params)),
})
}
}
}
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