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