From 91b2d1fcc11c181b1b69db9157188ec39768b5ba Mon Sep 17 00:00:00 2001
From: Alex Auvolat <alex@adnab.me>
Date: Fri, 24 Apr 2020 18:47:11 +0000
Subject: Some basic S3 functionnality

---
 src/api/s3_put.rs | 190 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 190 insertions(+)
 create mode 100644 src/api/s3_put.rs

(limited to 'src/api/s3_put.rs')

diff --git a/src/api/s3_put.rs b/src/api/s3_put.rs
new file mode 100644
index 00000000..15c2ccb7
--- /dev/null
+++ b/src/api/s3_put.rs
@@ -0,0 +1,190 @@
+use std::collections::VecDeque;
+use std::sync::Arc;
+
+use futures::stream::*;
+use hyper::Body;
+
+use garage_util::data::*;
+use garage_util::error::Error;
+
+use garage_core::block::INLINE_THRESHOLD;
+use garage_core::block_ref_table::*;
+use garage_core::garage::Garage;
+use garage_core::object_table::*;
+use garage_core::version_table::*;
+
+pub async fn handle_put(
+	garage: Arc<Garage>,
+	mime_type: &str,
+	bucket: &str,
+	key: &str,
+	body: Body,
+) -> Result<UUID, Error> {
+	let version_uuid = gen_uuid();
+
+	let mut chunker = BodyChunker::new(body, garage.config.block_size);
+	let first_block = match chunker.next().await? {
+		Some(x) => x,
+		None => return Err(Error::BadRequest(format!("Empty body"))),
+	};
+
+	let mut object_version = ObjectVersion {
+		uuid: version_uuid,
+		timestamp: now_msec(),
+		mime_type: mime_type.to_string(),
+		size: first_block.len() as u64,
+		is_complete: false,
+		data: ObjectVersionData::DeleteMarker,
+	};
+
+	if first_block.len() < INLINE_THRESHOLD {
+		object_version.data = ObjectVersionData::Inline(first_block);
+		object_version.is_complete = true;
+
+		let object = Object::new(bucket.into(), key.into(), vec![object_version]);
+		garage.object_table.insert(&object).await?;
+		return Ok(version_uuid);
+	}
+
+	let version = Version::new(version_uuid, bucket.into(), key.into(), false, vec![]);
+
+	let first_block_hash = hash(&first_block[..]);
+	object_version.data = ObjectVersionData::FirstBlock(first_block_hash);
+	let object = Object::new(bucket.into(), key.into(), vec![object_version.clone()]);
+	garage.object_table.insert(&object).await?;
+
+	let mut next_offset = first_block.len();
+	let mut put_curr_version_block = put_block_meta(garage.clone(), &version, 0, first_block_hash);
+	let mut put_curr_block = garage
+		.block_manager
+		.rpc_put_block(first_block_hash, first_block);
+
+	loop {
+		let (_, _, next_block) =
+			futures::try_join!(put_curr_block, put_curr_version_block, chunker.next())?;
+		if let Some(block) = next_block {
+			let block_hash = hash(&block[..]);
+			let block_len = block.len();
+			put_curr_version_block =
+				put_block_meta(garage.clone(), &version, next_offset as u64, block_hash);
+			put_curr_block = garage.block_manager.rpc_put_block(block_hash, block);
+			next_offset += block_len;
+		} else {
+			break;
+		}
+	}
+
+	// TODO: if at any step we have an error, we should undo everything we did
+
+	object_version.is_complete = true;
+	object_version.size = next_offset as u64;
+
+	let object = Object::new(bucket.into(), key.into(), vec![object_version]);
+	garage.object_table.insert(&object).await?;
+
+	Ok(version_uuid)
+}
+
+async fn put_block_meta(
+	garage: Arc<Garage>,
+	version: &Version,
+	offset: u64,
+	hash: Hash,
+) -> Result<(), Error> {
+	// TODO: don't clone, restart from empty block list ??
+	let mut version = version.clone();
+	version.add_block(VersionBlock { offset, hash }).unwrap();
+
+	let block_ref = BlockRef {
+		block: hash,
+		version: version.uuid,
+		deleted: false,
+	};
+
+	futures::try_join!(
+		garage.version_table.insert(&version),
+		garage.block_ref_table.insert(&block_ref),
+	)?;
+	Ok(())
+}
+
+struct BodyChunker {
+	body: Body,
+	read_all: bool,
+	block_size: usize,
+	buf: VecDeque<u8>,
+}
+
+impl BodyChunker {
+	fn new(body: Body, block_size: usize) -> Self {
+		Self {
+			body,
+			read_all: false,
+			block_size,
+			buf: VecDeque::new(),
+		}
+	}
+	async fn next(&mut self) -> Result<Option<Vec<u8>>, Error> {
+		while !self.read_all && self.buf.len() < self.block_size {
+			if let Some(block) = self.body.next().await {
+				let bytes = block?;
+				trace!("Body next: {} bytes", bytes.len());
+				self.buf.extend(&bytes[..]);
+			} else {
+				self.read_all = true;
+			}
+		}
+		if self.buf.len() == 0 {
+			Ok(None)
+		} else if self.buf.len() <= self.block_size {
+			let block = self.buf.drain(..).collect::<Vec<u8>>();
+			Ok(Some(block))
+		} else {
+			let block = self.buf.drain(..self.block_size).collect::<Vec<u8>>();
+			Ok(Some(block))
+		}
+	}
+}
+
+pub async fn handle_delete(garage: Arc<Garage>, bucket: &str, key: &str) -> Result<UUID, Error> {
+	let exists = match garage
+		.object_table
+		.get(&bucket.to_string(), &key.to_string())
+		.await?
+	{
+		None => false,
+		Some(o) => {
+			let mut has_active_version = false;
+			for v in o.versions().iter() {
+				if v.data != ObjectVersionData::DeleteMarker {
+					has_active_version = true;
+					break;
+				}
+			}
+			has_active_version
+		}
+	};
+
+	if !exists {
+		// No need to delete
+		return Ok([0u8; 32].into());
+	}
+
+	let version_uuid = gen_uuid();
+
+	let object = Object::new(
+		bucket.into(),
+		key.into(),
+		vec![ObjectVersion {
+			uuid: version_uuid,
+			timestamp: now_msec(),
+			mime_type: "application/x-delete-marker".into(),
+			size: 0,
+			is_complete: true,
+			data: ObjectVersionData::DeleteMarker,
+		}],
+	);
+
+	garage.object_table.insert(&object).await?;
+	return Ok(version_uuid);
+}
-- 
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