use serde::{Deserialize, Serialize}; use garage_table::crdt::CRDT; use garage_table::*; use crate::key_table::PermissionSet; /// 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 { /// Name of the bucket pub name: String, /// State, and configuration if not deleted, of the bucket pub state: crdt::LWW, } /// State of a bucket #[derive(PartialEq, Clone, Debug, Serialize, Deserialize)] pub enum BucketState { /// The bucket is deleted Deleted, /// The bucket exists 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); } } } } } /// Configuration for a bucket #[derive(PartialEq, Clone, Debug, Serialize, Deserialize)] pub struct BucketParams { /// Map of key with access to the bucket, and what kind of access they give pub authorized_keys: crdt::LWWMap, /// Is the bucket served as http pub website: crdt::LWW, } impl BucketParams { /// Create an empty BucketParams with no authorized keys and no website accesss pub fn new() -> Self { BucketParams { authorized_keys: crdt::LWWMap::new(), website: crdt::LWW::new(false), } } } impl CRDT for BucketParams { fn merge(&mut self, o: &Self) { self.authorized_keys.merge(&o.authorized_keys); self.website.merge(&o.website); } } impl Default for BucketParams { fn default() -> Self { Self::new() } } impl Bucket { /// Initializes a new instance of the Bucket struct pub fn new(name: String) -> Self { Bucket { name, state: crdt::LWW::new(BucketState::Present(BucketParams::new())), } } /// Returns true if this represents a deleted bucket pub fn is_deleted(&self) -> bool { *self.state.get() == BucketState::Deleted } /// Return the list of authorized keys, when each was updated, and the permission associated to /// the key pub fn authorized_keys(&self) -> &[(String, u64, PermissionSet)] { match self.state.get() { BucketState::Deleted => &[], BucketState::Present(state) => state.authorized_keys.items(), } } } impl Entry for Bucket { fn partition_key(&self) -> &EmptyKey { &EmptyKey } fn sort_key(&self) -> &String { &self.name } } impl CRDT for Bucket { fn merge(&mut self, other: &Self) { self.state.merge(&other.state); } } pub struct BucketTable; impl TableSchema for BucketTable { type P = EmptyKey; type S = String; type E = Bucket; type Filter = DeletedFilter; fn matches_filter(entry: &Self::E, filter: &Self::Filter) -> bool { filter.apply(entry.is_deleted()) } }