forked from Deuxfleurs/garage
Correctly implement CompleteMultipartUpload with etag check of parts
This commit is contained in:
parent
445912dc6a
commit
af7600f989
2 changed files with 36 additions and 19 deletions
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@ -100,7 +100,7 @@ pub async fn handle_put(
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// Transfer data and verify checksum
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let tx_result = read_and_put_blocks(
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&garage,
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version,
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&version,
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1,
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first_block,
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first_block_hash,
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@ -174,7 +174,7 @@ fn ensure_checksum_matches(
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async fn read_and_put_blocks(
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garage: &Arc<Garage>,
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version: Version,
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version: &Version,
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part_number: u64,
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first_block: Vec<u8>,
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first_block_hash: Hash,
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@ -392,7 +392,7 @@ pub async fn handle_put_part(
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let first_block_hash = blake2sum(&first_block[..]);
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let (_, data_md5sum, data_sha256sum) = read_and_put_blocks(
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&garage,
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version,
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&version,
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part_number,
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first_block,
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first_block_hash,
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@ -400,6 +400,7 @@ pub async fn handle_put_part(
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)
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.await?;
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// Verify that checksums map
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ensure_checksum_matches(
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data_md5sum.as_slice(),
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data_sha256sum,
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@ -407,8 +408,14 @@ pub async fn handle_put_part(
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content_sha256,
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)?;
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// Store part etag in version
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let data_md5sum_hex = hex::encode(data_md5sum);
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let mut version = version;
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version.parts_etags.put(part_number, data_md5sum_hex.clone());
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garage.version_table.insert(&version).await?;
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let response = Response::builder()
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.header("ETag", format!("\"{}\"", hex::encode(data_md5sum)))
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.header("ETag", format!("\"{}\"", data_md5sum_hex))
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.body(Body::from(vec![]))
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.unwrap();
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Ok(response)
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@ -463,43 +470,46 @@ pub async fn handle_complete_multipart_upload(
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};
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// Check that the list of parts they gave us corresponds to the parts we have here
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// TODO: check MD5 sum of all uploaded parts? but that would mean we have to store them somewhere...
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let mut parts = version
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.blocks
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println!("Expected parts from request: {:?}", body_list_of_parts);
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println!("Parts stored in version: {:?}", version.parts_etags.items());
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let parts = version
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.parts_etags
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.items()
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.iter()
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.map(|x| x.0.part_number)
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.collect::<Vec<_>>();
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parts.dedup();
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.map(|pair| (&pair.0, &pair.1));
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let same_parts = body_list_of_parts
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.iter()
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.map(|x| &x.part_number)
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.eq(parts.iter());
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.map(|x| (&x.part_number, &x.etag))
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.eq(parts);
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if !same_parts {
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return Err(Error::BadRequest(format!("We don't have the same parts")));
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}
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// ETag calculation: we produce ETags that have the same form as
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// those of S3 multipart uploads, but we don't use their actual
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// calculation for the first part (we use random bytes). This
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// shouldn't impact compatibility as the S3 docs specify that
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// the ETag is an opaque value in case of a multipart upload.
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// See also: https://teppen.io/2018/06/23/aws_s3_etags/
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// Calculate etag of final object
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// To understand how etags are calculated, read more here:
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// https://teppen.io/2018/06/23/aws_s3_etags/
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let num_parts = version.blocks.items().last().unwrap().0.part_number
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- version.blocks.items().first().unwrap().0.part_number
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+ 1;
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let mut etag_md5_hasher = Md5::new();
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for (_, etag) in version.parts_etags.items().iter() {
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etag_md5_hasher.update(etag.as_bytes());
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}
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let etag = format!(
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"{}-{}",
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hex::encode(&rand::random::<[u8; 16]>()[..]),
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hex::encode(etag_md5_hasher.finalize()),
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num_parts
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);
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// Calculate total size of final object
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let total_size = version
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.blocks
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.items()
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.iter()
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.map(|x| x.1.size)
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.fold(0, |x, y| x + y);
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// Write final object version
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object_version.state = ObjectVersionState::Complete(ObjectVersionData::FirstBlock(
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ObjectVersionMeta {
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headers,
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@ -512,6 +522,7 @@ pub async fn handle_complete_multipart_upload(
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let final_object = Object::new(bucket.clone(), key.clone(), vec![object_version]);
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garage.object_table.insert(&final_object).await?;
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// Send response saying ok we're done
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let mut xml = String::new();
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writeln!(&mut xml, r#"<?xml version="1.0" encoding="UTF-8"?>"#).unwrap();
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writeln!(
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@ -16,8 +16,11 @@ pub struct Version {
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pub uuid: UUID,
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// Actual data: the blocks for this version
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// In the case of a multipart upload, also store the etags
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// of individual parts and check them when doing CompleteMultipartUpload
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pub deleted: crdt::Bool,
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pub blocks: crdt::Map<VersionBlockKey, VersionBlock>,
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pub parts_etags: crdt::Map<u64, String>,
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// Back link to bucket+key so that we can figure if
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// this was deleted later on
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@ -31,6 +34,7 @@ impl Version {
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uuid,
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deleted: deleted.into(),
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blocks: crdt::Map::new(),
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parts_etags: crdt::Map::new(),
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bucket,
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key,
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}
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@ -82,8 +86,10 @@ impl CRDT for Version {
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if self.deleted.get() {
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self.blocks.clear();
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self.parts_etags.clear();
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} else {
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self.blocks.merge(&other.blocks);
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self.parts_etags.merge(&other.parts_etags);
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}
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}
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}
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