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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<BucketState>,
}
/// 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<String, PermissionSet>,
/// Is the bucket served as http
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 {
/// 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 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<EmptyKey, String> 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())
}
}
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