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authorAlex Auvolat <alex@adnab.me>2020-11-20 21:15:24 +0100
committerAlex Auvolat <alex@adnab.me>2020-11-20 23:53:54 +0100
commite02e9e035e269cd6b660c92706db424a2edb5306 (patch)
treecee743c465538614a4e31f86f56df4858bde2f54 /src/model
parent5dc304ac41c2ae0699fbdd56117b60c517a1ad39 (diff)
downloadgarage-e02e9e035e269cd6b660c92706db424a2edb5306.tar.gz
garage-e02e9e035e269cd6b660c92706db424a2edb5306.zip
Begin improve model to use better CRDTs
Diffstat (limited to 'src/model')
-rw-r--r--src/model/key_table.rs121
1 files changed, 51 insertions, 70 deletions
diff --git a/src/model/key_table.rs b/src/model/key_table.rs
index 05b938ce..2b825aa3 100644
--- a/src/model/key_table.rs
+++ b/src/model/key_table.rs
@@ -2,9 +2,12 @@ use async_trait::async_trait;
use serde::{Deserialize, Serialize};
use garage_table::*;
-use garage_util::data::*;
+use garage_table::crdt::CRDT;
+
use garage_util::error::Error;
+use model010::key_table as prev;
+
#[derive(PartialEq, Clone, Debug, Serialize, Deserialize)]
pub struct Key {
// Primary key
@@ -14,83 +17,56 @@ pub struct Key {
pub secret_key: String,
// Name
- pub name: String,
- pub name_timestamp: u64,
+ pub name: crdt::LWW<String>,
// Deletion
- pub deleted: bool,
+ pub deleted: crdt::Bool,
// Authorized keys
- authorized_buckets: Vec<AllowedBucket>,
+ pub authorized_buckets: crdt::LWWMap<String, PermissionSet>,
+
+ // CRDT interaction: deleted implies authorized_buckets is empty
}
impl Key {
- pub fn new(name: String, buckets: Vec<AllowedBucket>) -> Self {
+ pub fn new(name: String) -> Self {
let key_id = format!("GK{}", hex::encode(&rand::random::<[u8; 12]>()[..]));
let secret_key = hex::encode(&rand::random::<[u8; 32]>()[..]);
- let mut ret = Self {
+ let ret = Self {
key_id,
secret_key,
- name,
- name_timestamp: now_msec(),
- deleted: false,
- authorized_buckets: vec![],
+ name: crdt::LWW::new(name),
+ deleted: crdt::Bool::new(false),
+ authorized_buckets: crdt::LWWMap::new(),
};
- for b in buckets {
- ret.add_bucket(b)
- .expect("Duplicate AllowedBucket in Key constructor");
- }
ret
}
pub fn delete(key_id: String) -> Self {
Self {
key_id,
secret_key: "".into(),
- name: "".into(),
- name_timestamp: now_msec(),
- deleted: true,
- authorized_buckets: vec![],
+ name: crdt::LWW::new("".to_string()),
+ deleted: crdt::Bool::new(true),
+ authorized_buckets: crdt::LWWMap::new(),
}
}
/// Add an authorized bucket, only if it wasn't there before
- pub fn add_bucket(&mut self, new: AllowedBucket) -> Result<(), ()> {
- match self
- .authorized_buckets
- .binary_search_by(|b| b.bucket.cmp(&new.bucket))
- {
- Err(i) => {
- self.authorized_buckets.insert(i, new);
- Ok(())
- }
- Ok(_) => Err(()),
- }
- }
- pub fn authorized_buckets(&self) -> &[AllowedBucket] {
- &self.authorized_buckets[..]
- }
- pub fn clear_buckets(&mut self) {
- self.authorized_buckets.clear();
- }
pub fn allow_read(&self, bucket: &str) -> bool {
self.authorized_buckets
- .iter()
- .find(|x| x.bucket.as_str() == bucket)
+ .get(&bucket.to_string())
.map(|x| x.allow_read)
.unwrap_or(false)
}
pub fn allow_write(&self, bucket: &str) -> bool {
self.authorized_buckets
- .iter()
- .find(|x| x.bucket.as_str() == bucket)
+ .get(&bucket.to_string())
.map(|x| x.allow_write)
.unwrap_or(false)
}
}
-#[derive(PartialEq, Clone, Debug, Serialize, Deserialize)]
-pub struct AllowedBucket {
- pub bucket: String,
- pub timestamp: u64,
+#[derive(PartialOrd, Ord, PartialEq, Eq, Clone, Debug, Serialize, Deserialize)]
+pub struct PermissionSet {
pub allow_read: bool,
pub allow_write: bool,
}
@@ -104,35 +80,15 @@ impl Entry<EmptyKey, String> for Key {
}
fn merge(&mut self, other: &Self) {
- if other.name_timestamp > self.name_timestamp {
- self.name_timestamp = other.name_timestamp;
- self.name = other.name.clone();
- }
+ self.name.merge(&other.name);
+ self.deleted.merge(&other.deleted);
- if other.deleted {
- self.deleted = true;
- }
- if self.deleted {
+ if self.deleted.get() {
self.authorized_buckets.clear();
return;
}
- for ab in other.authorized_buckets.iter() {
- match self
- .authorized_buckets
- .binary_search_by(|our_ab| our_ab.bucket.cmp(&ab.bucket))
- {
- Ok(i) => {
- let our_ab = &mut self.authorized_buckets[i];
- if ab.timestamp > our_ab.timestamp {
- *our_ab = ab.clone();
- }
- }
- Err(i) => {
- self.authorized_buckets.insert(i, ab.clone());
- }
- }
- }
+ self.authorized_buckets.merge(&other.authorized_buckets);
}
}
@@ -150,6 +106,31 @@ impl TableSchema for KeyTable {
}
fn matches_filter(entry: &Self::E, filter: &Self::Filter) -> bool {
- filter.apply(entry.deleted)
+ filter.apply(entry.deleted.get())
+ }
+
+ fn try_migrate(bytes: &[u8]) -> Option<Self::E> {
+ let old = match rmp_serde::decode::from_read_ref::<_, prev::Key>(bytes) {
+ Ok(x) => x,
+ Err(_) => return None,
+ };
+ let mut new = Self::E {
+ key_id: old.key_id.clone(),
+ secret_key: old.secret_key.clone(),
+ name: crdt::LWW::migrate_from_raw(old.name_timestamp, old.name.clone()),
+ deleted: crdt::Bool::new(old.deleted),
+ authorized_buckets: crdt::LWWMap::new(),
+ };
+ for ab in old.authorized_buckets() {
+ let it = crdt::LWWMap::migrate_from_raw_item(
+ ab.bucket.clone(),
+ ab.timestamp,
+ PermissionSet{
+ allow_read: ab.allow_read,
+ allow_write: ab.allow_write,
+ });
+ new.authorized_buckets.merge(&it);
+ }
+ Some(new)
}
}