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|
use serde::{Deserialize, Serialize};
use std::collections::BTreeMap;
use garage_util::data::*;
use garage_table::crdt::*;
/// An object
#[derive(PartialEq, Clone, Debug, Serialize, Deserialize)]
pub struct Object {
/// The bucket in which the object is stored, used as partition key
pub bucket: String,
/// The key at which the object is stored in its bucket, used as sorting key
pub key: String,
/// The list of currenty stored versions of the object
versions: Vec<ObjectVersion>,
}
impl Object {
/// Get a list of currently stored versions of `Object`
pub fn versions(&self) -> &[ObjectVersion] {
&self.versions[..]
}
}
/// Informations about a version of an object
#[derive(PartialEq, Clone, Debug, Serialize, Deserialize)]
pub struct ObjectVersion {
/// Id of the version
pub uuid: Uuid,
/// Timestamp of when the object was created
pub timestamp: u64,
/// State of the version
pub state: ObjectVersionState,
}
/// State of an object version
#[derive(PartialEq, Clone, Debug, Serialize, Deserialize)]
pub enum ObjectVersionState {
/// The version is being received
Uploading(ObjectVersionHeaders),
/// The version is fully received
Complete(ObjectVersionData),
/// The version uploaded containded errors or the upload was explicitly aborted
Aborted,
}
impl Crdt for ObjectVersionState {
fn merge(&mut self, other: &Self) {
use ObjectVersionState::*;
match other {
Aborted => {
*self = Aborted;
}
Complete(b) => match self {
Aborted => {}
Complete(a) => {
a.merge(b);
}
Uploading(_) => {
*self = Complete(b.clone());
}
},
Uploading(_) => {}
}
}
}
/// Data stored in object version
#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Debug, Serialize, Deserialize)]
pub enum ObjectVersionData {
/// The object was deleted, this Version is a tombstone to mark it as such
DeleteMarker,
/// The object is short, it's stored inlined
Inline(ObjectVersionMeta, #[serde(with = "serde_bytes")] Vec<u8>),
/// The object is not short, Hash of first block is stored here, next segments hashes are
/// stored in the version table
FirstBlock(ObjectVersionMeta, Hash),
}
impl AutoCrdt for ObjectVersionData {
const WARN_IF_DIFFERENT: bool = true;
}
/// Metadata about the object version
#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Debug, Serialize, Deserialize)]
pub struct ObjectVersionMeta {
/// Headers to send to the client
pub headers: ObjectVersionHeaders,
/// Size of the object
pub size: u64,
/// etag of the object
pub etag: String,
}
/// Additional headers for an object
#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Debug, Serialize, Deserialize)]
pub struct ObjectVersionHeaders {
/// Content type of the object
pub content_type: String,
/// Any other http headers to send
pub other: BTreeMap<String, String>,
}
impl ObjectVersion {
fn cmp_key(&self) -> (u64, Uuid) {
(self.timestamp, self.uuid)
}
/// Is the object version completely received
pub fn is_complete(&self) -> bool {
matches!(self.state, ObjectVersionState::Complete(_))
}
}
impl Crdt for Object {
fn merge(&mut self, other: &Self) {
// Merge versions from other into here
for other_v in other.versions.iter() {
match self
.versions
.binary_search_by(|v| v.cmp_key().cmp(&other_v.cmp_key()))
{
Ok(i) => {
self.versions[i].state.merge(&other_v.state);
}
Err(i) => {
self.versions.insert(i, other_v.clone());
}
}
}
// Remove versions which are obsolete, i.e. those that come
// before the last version which .is_complete().
let last_complete = self
.versions
.iter()
.enumerate()
.rev()
.find(|(_, v)| v.is_complete())
.map(|(vi, _)| vi);
if let Some(last_vi) = last_complete {
self.versions = self.versions.drain(last_vi..).collect::<Vec<_>>();
}
}
}
|
