garage/src/model/bucket_table.rs

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use serde::{Deserialize, Serialize};
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use garage_table::crdt::Crdt;
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use garage_table::*;
use crate::key_table::PermissionSet;
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/// 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 {
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/// Name of the bucket
pub name: String,
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/// State, and configuration if not deleted, of the bucket
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pub state: crdt::Lww<BucketState>,
}
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/// State of a bucket
#[derive(PartialEq, Clone, Debug, Serialize, Deserialize)]
pub enum BucketState {
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/// The bucket is deleted
Deleted,
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/// The bucket exists
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Present(BucketParams),
}
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impl Crdt for BucketState {
fn merge(&mut self, o: &Self) {
match o {
BucketState::Deleted => *self = BucketState::Deleted,
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BucketState::Present(other_params) => {
if let BucketState::Present(params) = self {
params.merge(other_params);
}
}
}
}
}
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/// Configuration for a bucket
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#[derive(PartialEq, Clone, Debug, Serialize, Deserialize)]
pub struct BucketParams {
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/// Map of key with access to the bucket, and what kind of access they give
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pub authorized_keys: crdt::LwwMap<String, PermissionSet>,
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/// Is the bucket served as http
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pub website: crdt::Lww<bool>,
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}
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impl BucketParams {
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/// Create an empty BucketParams with no authorized keys and no website accesss
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pub fn new() -> Self {
BucketParams {
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authorized_keys: crdt::LwwMap::new(),
website: crdt::Lww::new(false),
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}
}
}
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impl Crdt for BucketParams {
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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 {
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/// Initializes a new instance of the Bucket struct
pub fn new(name: String) -> Self {
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Bucket {
name,
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state: crdt::Lww::new(BucketState::Present(BucketParams::new())),
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}
}
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/// Returns true if this represents a deleted bucket
pub fn is_deleted(&self) -> bool {
*self.state.get() == BucketState::Deleted
}
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/// 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 => &[],
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BucketState::Present(state) => state.authorized_keys.items(),
}
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}
}
impl Entry<EmptyKey, String> for Bucket {
fn partition_key(&self) -> &EmptyKey {
&EmptyKey
}
fn sort_key(&self) -> &String {
&self.name
}
}
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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())
}
}