Rename garage_core to garage_model

1 files changed, 198 insertions, 0 deletions

diff --git a/src/model/object_table.rs b/src/model/object_table.rs
new file mode 100644
index 00000000..01df70e6
--- /dev/null
+++ b/src/model/object_table.rs
@@ -0,0 +1,198 @@
+use async_trait::async_trait;
+use serde::{Deserialize, Serialize};
+use std::sync::Arc;
+
+use garage_util::background::BackgroundRunner;
+use garage_util::data::*;
+use garage_util::error::Error;
+
+use garage_table::table_sharded::*;
+use garage_table::*;
+
+use crate::version_table::*;
+
+#[derive(PartialEq, Clone, Debug, Serialize, Deserialize)]
+pub struct Object {
+	// Primary key
+	pub bucket: String,
+
+	// Sort key
+	pub key: String,
+
+	// Data
+	versions: Vec<ObjectVersion>,
+}
+
+impl Object {
+	pub fn new(bucket: String, key: String, versions: Vec<ObjectVersion>) -> Self {
+		let mut ret = Self {
+			bucket,
+			key,
+			versions: vec![],
+		};
+		for v in versions {
+			ret.add_version(v)
+				.expect("Twice the same ObjectVersion in Object constructor");
+		}
+		ret
+	}
+	/// Adds a version if it wasn't already present
+	pub fn add_version(&mut self, new: ObjectVersion) -> Result<(), ()> {
+		match self
+			.versions
+			.binary_search_by(|v| v.cmp_key().cmp(&new.cmp_key()))
+		{
+			Err(i) => {
+				self.versions.insert(i, new);
+				Ok(())
+			}
+			Ok(_) => Err(()),
+		}
+	}
+	pub fn versions(&self) -> &[ObjectVersion] {
+		&self.versions[..]
+	}
+}
+
+#[derive(PartialEq, Clone, Debug, Serialize, Deserialize)]
+pub struct ObjectVersion {
+	pub uuid: UUID,
+	pub timestamp: u64,
+
+	pub mime_type: String,
+	pub size: u64,
+	pub state: ObjectVersionState,
+
+	pub data: ObjectVersionData,
+}
+
+#[derive(PartialEq, Clone, Copy, Debug, Serialize, Deserialize)]
+pub enum ObjectVersionState {
+	Uploading,
+	Complete,
+	Aborted,
+}
+
+impl ObjectVersionState {
+	fn max(self, other: Self) -> Self {
+		use ObjectVersionState::*;
+		if self == Aborted || other == Aborted {
+			Aborted
+		} else if self == Complete || other == Complete {
+			Complete
+		} else {
+			Uploading
+		}
+	}
+}
+
+#[derive(PartialEq, Clone, Debug, Serialize, Deserialize)]
+pub enum ObjectVersionData {
+	Uploading,
+	DeleteMarker,
+	Inline(#[serde(with = "serde_bytes")] Vec<u8>),
+	FirstBlock(Hash),
+}
+
+impl ObjectVersion {
+	fn cmp_key(&self) -> (u64, UUID) {
+		(self.timestamp, self.uuid)
+	}
+	pub fn is_complete(&self) -> bool {
+		self.state == ObjectVersionState::Complete
+	}
+	pub fn is_data(&self) -> bool {
+		self.state == ObjectVersionState::Complete && self.data != ObjectVersionData::DeleteMarker
+	}
+}
+
+impl Entry<String, String> for Object {
+	fn partition_key(&self) -> &String {
+		&self.bucket
+	}
+	fn sort_key(&self) -> &String {
+		&self.key
+	}
+
+	fn merge(&mut self, other: &Self) {
+		for other_v in other.versions.iter() {
+			match self
+				.versions
+				.binary_search_by(|v| v.cmp_key().cmp(&other_v.cmp_key()))
+			{
+				Ok(i) => {
+					let mut v = &mut self.versions[i];
+					if other_v.size > v.size {
+						v.size = other_v.size;
+					}
+					v.state = v.state.max(other_v.state);
+					if v.data == ObjectVersionData::Uploading {
+						v.data = other_v.data.clone();
+					}
+				}
+				Err(i) => {
+					self.versions.insert(i, other_v.clone());
+				}
+			}
+		}
+		let last_complete = self
+			.versions
+			.iter()
+			.enumerate()
+			.rev()
+			.filter(|(_, v)| v.is_complete())
+			.next()
+			.map(|(vi, _)| vi);
+
+		if let Some(last_vi) = last_complete {
+			self.versions = self.versions.drain(last_vi..).collect::<Vec<_>>();
+		}
+	}
+}
+
+pub struct ObjectTable {
+	pub background: Arc<BackgroundRunner>,
+	pub version_table: Arc<Table<VersionTable, TableShardedReplication>>,
+}
+
+#[async_trait]
+impl TableSchema for ObjectTable {
+	type P = String;
+	type S = String;
+	type E = Object;
+	type Filter = ();
+
+	async fn updated(&self, old: Option<Self::E>, new: Option<Self::E>) -> Result<(), Error> {
+		let version_table = self.version_table.clone();
+		if let (Some(old_v), Some(new_v)) = (old, new) {
+			// Propagate deletion of old versions
+			for v in old_v.versions.iter() {
+				let newly_deleted = match new_v
+					.versions
+					.binary_search_by(|nv| nv.cmp_key().cmp(&v.cmp_key()))
+				{
+					Err(_) => true,
+					Ok(i) => {
+						new_v.versions[i].state == ObjectVersionState::Aborted
+							&& v.state != ObjectVersionState::Aborted
+					}
+				};
+				if newly_deleted {
+					let deleted_version = Version::new(
+						v.uuid,
+						old_v.bucket.clone(),
+						old_v.key.clone(),
+						true,
+						vec![],
+					);
+					version_table.insert(&deleted_version).await?;
+				}
+			}
+		}
+		Ok(())
+	}
+
+	fn matches_filter(entry: &Self::E, _filter: &Self::Filter) -> bool {
+		entry.versions.iter().any(|v| v.is_data())
+	}
+}