Begin improve model to use better CRDTs

This commit is contained in:
Alex 2020-11-20 21:15:24 +01:00
parent 5dc304ac41
commit e02e9e035e
5 changed files with 245 additions and 96 deletions

View file

@ -68,7 +68,7 @@ pub async fn check_signature(
.key_table
.get(&EmptyKey, &authorization.key_id)
.await?
.filter(|k| !k.deleted)
.filter(|k| !k.deleted.get())
.ok_or(Error::Forbidden(format!(
"No such key: {}",
authorization.key_id

View file

@ -6,6 +6,7 @@ use garage_util::data::*;
use garage_util::error::Error;
use garage_table::*;
use garage_table::crdt::CRDT;
use garage_rpc::rpc_client::*;
use garage_rpc::rpc_server::*;
@ -114,7 +115,7 @@ impl AdminRpcHandler {
// --- done checking, now commit ---
for ak in bucket.authorized_keys() {
if let Some(key) = self.garage.key_table.get(&EmptyKey, &ak.key_id).await? {
if !key.deleted {
if !key.deleted.get() {
self.update_key_bucket(key, &bucket.name, false, false)
.await?;
}
@ -173,7 +174,7 @@ impl AdminRpcHandler {
.get_range(&EmptyKey, None, Some(DeletedFilter::NotDeleted), 10000)
.await?
.iter()
.map(|k| (k.key_id.to_string(), k.name.to_string()))
.map(|k| (k.key_id.to_string(), k.name.get().clone()))
.collect::<Vec<_>>();
Ok(AdminRPC::KeyList(key_ids))
}
@ -182,14 +183,13 @@ impl AdminRpcHandler {
Ok(AdminRPC::KeyInfo(key))
}
KeyOperation::New(query) => {
let key = Key::new(query.name, vec![]);
let key = Key::new(query.name);
self.garage.key_table.insert(&key).await?;
Ok(AdminRPC::KeyInfo(key))
}
KeyOperation::Rename(query) => {
let mut key = self.get_existing_key(&query.key_id).await?;
key.name_timestamp = std::cmp::max(key.name_timestamp + 1, now_msec());
key.name = query.new_name;
key.name.update(query.new_name);
self.garage.key_table.insert(&key).await?;
Ok(AdminRPC::KeyInfo(key))
}
@ -201,16 +201,16 @@ impl AdminRpcHandler {
)));
}
// --- done checking, now commit ---
for ab in key.authorized_buckets().iter() {
for (ab_name, _, _) in key.authorized_buckets.items().iter() {
if let Some(bucket) =
self.garage.bucket_table.get(&EmptyKey, &ab.bucket).await?
self.garage.bucket_table.get(&EmptyKey, ab_name).await?
{
if !bucket.deleted {
self.update_bucket_key(bucket, &key.key_id, false, false)
.await?;
}
} else {
return Err(Error::Message(format!("Bucket not found: {}", ab.bucket)));
return Err(Error::Message(format!("Bucket not found: {}", ab_name)));
}
}
let del_key = Key::delete(key.key_id);
@ -241,7 +241,7 @@ impl AdminRpcHandler {
.key_table
.get(&EmptyKey, id)
.await?
.filter(|k| !k.deleted)
.filter(|k| !k.deleted.get())
.map(Ok)
.unwrap_or(Err(Error::BadRPC(format!("Key {} does not exist", id))))
}
@ -281,22 +281,14 @@ impl AdminRpcHandler {
allow_read: bool,
allow_write: bool,
) -> Result<(), Error> {
let timestamp = match key
.authorized_buckets()
.iter()
.find(|x| x.bucket == *bucket)
{
None => now_msec(),
Some(ab) => std::cmp::max(ab.timestamp + 1, now_msec()),
};
key.clear_buckets();
key.add_bucket(AllowedBucket {
bucket: bucket.clone(),
timestamp,
allow_read,
allow_write,
})
.unwrap();
let old_map = key.authorized_buckets.take_and_clear();
key.authorized_buckets.merge(
&old_map.update_mutator(
bucket.clone(),
PermissionSet{
allow_read, allow_write
}
));
self.garage.key_table.insert(&key).await?;
Ok(())
}

View file

@ -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)
}
}

175
src/table/crdt.rs Normal file
View file

@ -0,0 +1,175 @@
use serde::{Deserialize, Serialize};
use garage_util::data::*;
pub trait CRDT {
fn merge(&mut self, other: &Self);
}
impl<T> CRDT for T
where T: Ord + Clone {
fn merge(&mut self, other: &Self) {
if other > self {
*self = other.clone();
}
}
}
// ---- LWW Register ----
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct LWW<T>
{
ts: u64,
v: T,
}
impl<T> LWW<T>
where T: Serialize + for<'de> Deserialize<'de> + Clone + core::fmt::Debug + PartialEq + Ord
{
pub fn new(value: T) -> Self {
Self {
ts: now_msec(),
v: value,
}
}
pub fn migrate_from_raw(ts: u64, value: T) -> Self {
Self {
ts,
v: value,
}
}
pub fn update(&mut self, new_value: T) {
self.ts = std::cmp::max(self.ts + 1, now_msec());
self.v = new_value;
}
pub fn get(&self) -> &T {
&self.v
}
}
impl<T> CRDT for LWW<T>
where T: Serialize + for<'de> Deserialize<'de> + Clone + core::fmt::Debug + PartialEq + CRDT
{
fn merge(&mut self, other: &Self) {
if other.ts > self.ts {
self.ts = other.ts;
self.v = other.v.clone();
} else if other.ts == self.ts {
self.v.merge(&other.v);
}
}
}
// ---- Boolean (true as absorbing state) ----
#[derive(Clone, Copy, Debug, Serialize, Deserialize, PartialEq)]
pub struct Bool(bool);
impl Bool {
pub fn new(b: bool) -> Self {
Self(b)
}
pub fn set(&mut self) {
self.0 = true;
}
pub fn get(&self) -> bool {
self.0
}
}
impl CRDT for Bool {
fn merge(&mut self, other: &Self) {
self.0 = self.0 || other.0;
}
}
// ---- LWW Map ----
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct LWWMap<K, V>
{
vals: Vec<(K, u64, V)>,
}
impl<K, V> LWWMap<K, V>
where K: Serialize + for<'de> Deserialize<'de> + Clone + core::fmt::Debug + PartialEq + Ord,
V: Serialize + for<'de> Deserialize<'de> + Clone + core::fmt::Debug + PartialEq + Ord,
{
pub fn new() -> Self {
Self{
vals: vec![],
}
}
pub fn migrate_from_raw_item(k: K, ts: u64, v: V) -> Self {
Self{
vals: vec![(k, ts, v)],
}
}
pub fn take_and_clear(&mut self) -> Self {
let vals = std::mem::replace(&mut self.vals, vec![]);
Self{vals}
}
pub fn clear(&mut self) {
self.vals.clear();
}
pub fn update_mutator(&self, k: K, new_v: V) -> Self {
let new_vals = match self
.vals
.binary_search_by(|(k2, _, _)| k2.cmp(&k))
{
Ok(i) => {
let (_, old_ts, _) = self.vals[i];
let new_ts = std::cmp::max(old_ts+1, now_msec());
vec![(k, new_ts, new_v)]
}
Err(_) => {
vec![(k, now_msec(), new_v)]
}
};
Self{
vals: new_vals,
}
}
pub fn get(&self, k: &K) -> Option<&V> {
match self
.vals
.binary_search_by(|(k2, _, _)| k2.cmp(&k))
{
Ok(i) => Some(&self.vals[i].2),
Err(_) => None
}
}
pub fn items(&self) -> &[(K, u64, V)] {
&self.vals[..]
}
}
impl<K, V> CRDT for LWWMap<K, V>
where K: Serialize + for<'de> Deserialize<'de> + Clone + core::fmt::Debug + Ord,
V: Serialize + for<'de> Deserialize<'de> + Clone + core::fmt::Debug + CRDT,
{
fn merge(&mut self, other: &Self) {
for (k, ts2, v2) in other.vals.iter() {
match self
.vals
.binary_search_by(|(k2, _, _)| k2.cmp(&k))
{
Ok(i) => {
let (_, ts1, v1) = &self.vals[i];
if ts2 > ts1 {
self.vals[i].1 = *ts2;
self.vals[i].2 = v2.clone();
} else if ts1 == ts2 {
self.vals[i].2.merge(&v2);
}
}
Err(i) => {
self.vals.insert(i, (k.clone(), *ts2, v2.clone()));
}
}
}
}
}

View file

@ -5,6 +5,7 @@ extern crate log;
pub mod schema;
pub mod util;
pub mod crdt;
pub mod table;
pub mod table_fullcopy;