use std::cmp::Ordering;
use std::collections::{BTreeMap, BTreeSet};
use std::iter::{Iterator, Peekable};
use std::sync::Arc;
use hyper::{Body, Response};
use garage_util::data::*;
use garage_util::error::Error as GarageError;
use garage_util::time::*;
use garage_model::garage::Garage;
use garage_model::object_table::*;
use garage_model::version_table::Version;
use garage_table::EmptyKey;
use crate::encoding::*;
use crate::error::*;
use crate::s3_put;
use crate::s3_xml;
const DUMMY_NAME: &str = "Dummy Key";
const DUMMY_KEY: &str = "GKDummyKey";
#[derive(Debug)]
pub struct ListQueryCommon {
pub bucket_name: String,
pub bucket_id: Uuid,
pub delimiter: Option<String>,
pub page_size: usize,
pub prefix: String,
pub urlencode_resp: bool,
}
#[derive(Debug)]
pub struct ListObjectsQuery {
pub is_v2: bool,
pub marker: Option<String>,
pub continuation_token: Option<String>,
pub start_after: Option<String>,
pub common: ListQueryCommon,
}
#[derive(Debug)]
pub struct ListMultipartUploadsQuery {
pub key_marker: Option<String>,
pub upload_id_marker: Option<String>,
pub common: ListQueryCommon,
}
#[derive(Debug)]
pub struct ListPartsQuery {
pub bucket_name: String,
pub bucket_id: Uuid,
pub key: String,
pub upload_id: String,
pub part_number_marker: Option<u64>,
pub max_parts: u64,
}
pub async fn handle_list(
garage: Arc<Garage>,
query: &ListObjectsQuery,
) -> Result<Response<Body>, Error> {
let io = |bucket, key, count| {
let t = &garage.object_table;
async move {
t.get_range(&bucket, key, Some(ObjectFilter::IsData), count)
.await
}
};
debug!("ListObjects {:?}", query);
let mut acc = query.build_accumulator();
let pagination = fetch_list_entries(&query.common, query.begin()?, &mut acc, &io).await?;
let result = s3_xml::ListBucketResult {
xmlns: (),
// Sending back request information
name: s3_xml::Value(query.common.bucket_name.to_string()),
prefix: uriencode_maybe(&query.common.prefix, query.common.urlencode_resp),
max_keys: s3_xml::IntValue(query.common.page_size as i64),
delimiter: query
.common
.delimiter
.as_ref()
.map(|x| uriencode_maybe(x, query.common.urlencode_resp)),
encoding_type: match query.common.urlencode_resp {
true => Some(s3_xml::Value("url".to_string())),
false => None,
},
marker: match (!query.is_v2, &query.marker) {
(true, Some(k)) => Some(uriencode_maybe(k, query.common.urlencode_resp)),
_ => None,
},
start_after: match (query.is_v2, &query.start_after) {
(true, Some(sa)) => Some(uriencode_maybe(sa, query.common.urlencode_resp)),
_ => None,
},
continuation_token: match (query.is_v2, &query.continuation_token) {
(true, Some(ct)) => Some(s3_xml::Value(ct.to_string())),
_ => None,
},
// Pagination
is_truncated: s3_xml::Value(format!("{}", pagination.is_some())),
key_count: Some(s3_xml::IntValue(
acc.keys.len() as i64 + acc.common_prefixes.len() as i64,
)),
next_marker: match (!query.is_v2, &pagination) {
(true, Some(RangeBegin::AfterKey { key: k }))
| (
true,
Some(RangeBegin::IncludingKey {
fallback_key: Some(k),
..
}),
) => Some(uriencode_maybe(k, query.common.urlencode_resp)),
_ => None,
},
next_continuation_token: match (query.is_v2, &pagination) {
(true, Some(RangeBegin::AfterKey { key })) => Some(s3_xml::Value(format!(
"]{}",
base64::encode(key.as_bytes())
))),
(true, Some(RangeBegin::IncludingKey { key, .. })) => Some(s3_xml::Value(format!(
"[{}",
base64::encode(key.as_bytes())
))),
_ => None,
},
// Body
contents: acc
.keys
.iter()
.map(|(key, info)| s3_xml::ListBucketItem {
key: uriencode_maybe(key, query.common.urlencode_resp),
last_modified: s3_xml::Value(msec_to_rfc3339(info.last_modified)),
size: s3_xml::IntValue(info.size as i64),
etag: s3_xml::Value(format!("\"{}\"", info.etag)),
storage_class: s3_xml::Value("STANDARD".to_string()),
})
.collect(),
common_prefixes: acc
.common_prefixes
.iter()
.map(|pfx| s3_xml::CommonPrefix {
prefix: uriencode_maybe(pfx, query.common.urlencode_resp),
})
.collect(),
};
let xml = s3_xml::to_xml_with_header(&result)?;
Ok(Response::builder()
.header("Content-Type", "application/xml")
.body(Body::from(xml.into_bytes()))?)
}
pub async fn handle_list_multipart_upload(
garage: Arc<Garage>,
query: &ListMultipartUploadsQuery,
) -> Result<Response<Body>, Error> {
let io = |bucket, key, count| {
let t = &garage.object_table;
async move {
t.get_range(&bucket, key, Some(ObjectFilter::IsUploading), count)
.await
}
};
debug!("ListMultipartUploads {:?}", query);
let mut acc = query.build_accumulator();
let pagination = fetch_list_entries(&query.common, query.begin()?, &mut acc, &io).await?;
let result = s3_xml::ListMultipartUploadsResult {
xmlns: (),
// Sending back some information about the request
bucket: s3_xml::Value(query.common.bucket_name.to_string()),
prefix: uriencode_maybe(&query.common.prefix, query.common.urlencode_resp),
delimiter: query
.common
.delimiter
.as_ref()
.map(|d| uriencode_maybe(d, query.common.urlencode_resp)),
max_uploads: s3_xml::IntValue(query.common.page_size as i64),
key_marker: query
.key_marker
.as_ref()
.map(|m| uriencode_maybe(m, query.common.urlencode_resp)),
upload_id_marker: query
.upload_id_marker
.as_ref()
.map(|m| s3_xml::Value(m.to_string())),
encoding_type: match query.common.urlencode_resp {
true => Some(s3_xml::Value("url".to_string())),
false => None,
},
// Handling pagination
is_truncated: s3_xml::Value(format!("{}", pagination.is_some())),
next_key_marker: match &pagination {
None => None,
Some(RangeBegin::AfterKey { key })
| Some(RangeBegin::AfterUpload { key, .. })
| Some(RangeBegin::IncludingKey { key, .. }) => {
Some(uriencode_maybe(key, query.common.urlencode_resp))
}
},
next_upload_id_marker: match pagination {
Some(RangeBegin::AfterUpload { upload, .. }) => {
Some(s3_xml::Value(hex::encode(upload)))
}
Some(RangeBegin::IncludingKey { .. }) => Some(s3_xml::Value("include".to_string())),
_ => None,
},
// Result body
upload: acc
.keys
.iter()
.map(|(uuid, info)| s3_xml::ListMultipartItem {
initiated: s3_xml::Value(msec_to_rfc3339(info.timestamp)),
key: uriencode_maybe(&info.key, query.common.urlencode_resp),
upload_id: s3_xml::Value(hex::encode(uuid)),
storage_class: s3_xml::Value("STANDARD".to_string()),
initiator: s3_xml::Initiator {
display_name: s3_xml::Value(DUMMY_NAME.to_string()),
id: s3_xml::Value(DUMMY_KEY.to_string()),
},
owner: s3_xml::Owner {
display_name: s3_xml::Value(DUMMY_NAME.to_string()),
id: s3_xml::Value(DUMMY_KEY.to_string()),
},
})
.collect(),
common_prefixes: acc
.common_prefixes
.iter()
.map(|c| s3_xml::CommonPrefix {
prefix: s3_xml::Value(c.to_string()),
})
.collect(),
};
let xml = s3_xml::to_xml_with_header(&result)?;
Ok(Response::builder()
.header("Content-Type", "application/xml")
.body(Body::from(xml.into_bytes()))?)
}
pub async fn handle_list_parts(
garage: Arc<Garage>,
query: &ListPartsQuery,
) -> Result<Response<Body>, Error> {
debug!("ListParts {:?}", query);
let upload_id = s3_put::decode_upload_id(&query.upload_id)?;
let (object, version) = futures::try_join!(
garage.object_table.get(&query.bucket_id, &query.key),
garage.version_table.get(&upload_id, &EmptyKey),
)?;
let (info, next) = fetch_part_info(query, object, version, upload_id)?;
let result = s3_xml::ListPartsResult {
xmlns: (),
bucket: s3_xml::Value(query.bucket_name.to_string()),
key: s3_xml::Value(query.key.to_string()),
upload_id: s3_xml::Value(query.upload_id.to_string()),
part_number_marker: query.part_number_marker.map(|e| s3_xml::IntValue(e as i64)),
next_part_number_marker: next.map(|e| s3_xml::IntValue(e as i64)),
max_parts: s3_xml::IntValue(query.max_parts as i64),
is_truncated: s3_xml::Value(next.map(|_| "true").unwrap_or("false").to_string()),
parts: info
.iter()
.map(|part| s3_xml::PartItem {
etag: s3_xml::Value(format!("\"{}\"", part.etag)),
last_modified: s3_xml::Value(msec_to_rfc3339(part.timestamp)),
part_number: s3_xml::IntValue(part.part_number as i64),
size: s3_xml::IntValue(part.size as i64),
})
.collect(),
initiator: s3_xml::Initiator {
display_name: s3_xml::Value(DUMMY_NAME.to_string()),
id: s3_xml::Value(DUMMY_KEY.to_string()),
},
owner: s3_xml::Owner {
display_name: s3_xml::Value(DUMMY_NAME.to_string()),
id: s3_xml::Value(DUMMY_KEY.to_string()),
},
storage_class: s3_xml::Value("STANDARD".to_string()),
};
let xml = s3_xml::to_xml_with_header(&result)?;
Ok(Response::builder()
.header("Content-Type", "application/xml")
.body(Body::from(xml.into_bytes()))?)
}
/*
* Private enums and structs
*/
#[derive(Debug)]
struct ObjectInfo {
last_modified: u64,
size: u64,
etag: String,
}
#[derive(Debug, PartialEq)]
struct UploadInfo {
key: String,
timestamp: u64,
}
#[derive(Debug, PartialEq)]
struct PartInfo {
etag: String,
timestamp: u64,
part_number: u64,
size: u64,
}
enum ExtractionResult {
NoMore,
Filled,
FilledAtUpload {
key: String,
upload: Uuid,
},
Extracted {
key: String,
},
// Fallback key is used for legacy APIs that only support
// exlusive pagination (and not inclusive one).
SkipTo {
key: String,
fallback_key: Option<String>,
},
}
#[derive(PartialEq, Clone, Debug)]
enum RangeBegin {
// Fallback key is used for legacy APIs that only support
// exlusive pagination (and not inclusive one).
IncludingKey {
key: String,
fallback_key: Option<String>,
},
AfterKey {
key: String,
},
AfterUpload {
key: String,
upload: Uuid,
},
}
type Pagination = Option<RangeBegin>;
/*
* Fetch list entries
*/
async fn fetch_list_entries<R, F>(
query: &ListQueryCommon,
begin: RangeBegin,
acc: &mut impl ExtractAccumulator,
mut io: F,
) -> Result<Pagination, Error>
where
R: futures::Future<Output = Result<Vec<Object>, GarageError>>,
F: FnMut(Uuid, Option<String>, usize) -> R,
{
let mut cursor = begin;
// +1 is needed as we may need to skip the 1st key
// (range is inclusive while most S3 requests are exclusive)
let count = query.page_size + 1;
loop {
let start_key = match cursor {
RangeBegin::AfterKey { ref key }
| RangeBegin::AfterUpload { ref key, .. }
| RangeBegin::IncludingKey { ref key, .. } => Some(key.clone()),
};
// Fetch objects
let objects = io(query.bucket_id, start_key.clone(), count).await?;
debug!(
"List: get range {:?} (max {}), results: {}",
start_key,
count,
objects.len()
);
let server_more = objects.len() >= count;
let prev_req_cursor = cursor.clone();
let mut iter = objects.iter().peekable();
// Drop the first key if needed
// Only AfterKey requires it according to the S3 spec and our implem.
match (&cursor, iter.peek()) {
(RangeBegin::AfterKey { key }, Some(object)) if &object.key == key => iter.next(),
(_, _) => None,
};
while let Some(object) = iter.peek() {
if !object.key.starts_with(&query.prefix) {
// If the key is not in the requested prefix, we're done
return Ok(None);
}
cursor = match acc.extract(query, &cursor, &mut iter) {
ExtractionResult::Extracted { key } => RangeBegin::AfterKey { key },
ExtractionResult::SkipTo { key, fallback_key } => {
RangeBegin::IncludingKey { key, fallback_key }
}
ExtractionResult::FilledAtUpload { key, upload } => {
return Ok(Some(RangeBegin::AfterUpload { key, upload }))
}
ExtractionResult::Filled => return Ok(Some(cursor)),
ExtractionResult::NoMore => return Ok(None),
};
}
if !server_more {
// We did not fully fill the accumulator despite exhausting all the data we have,
// we're done
return Ok(None);
}
if prev_req_cursor == cursor {
unreachable!("No progress has been done in the loop. This is a bug, please report it.");
}
}
}
fn fetch_part_info(
query: &ListPartsQuery,
object: Option<Object>,
version: Option<Version>,
upload_id: Uuid,
) -> Result<(Vec<PartInfo>, Option<u64>), Error> {
// Check results
let object = object.ok_or(Error::NoSuchKey)?;
let obj_version = object
.versions()
.iter()
.find(|v| v.uuid == upload_id && v.is_uploading())
.ok_or(Error::NoSuchUpload)?;
let version = version.ok_or(Error::NoSuchKey)?;
// Cut the beginning of our 2 vectors if required
let (etags, blocks) = match &query.part_number_marker {
Some(marker) => {
let next = marker + 1;
let part_idx = into_ok_or_err(
version
.parts_etags
.items()
.binary_search_by(|(part_num, _)| part_num.cmp(&next)),
);
let parts = &version.parts_etags.items()[part_idx..];
let block_idx = into_ok_or_err(
version
.blocks
.items()
.binary_search_by(|(vkey, _)| vkey.part_number.cmp(&next)),
);
let blocks = &version.blocks.items()[block_idx..];
(parts, blocks)
}
None => (version.parts_etags.items(), version.blocks.items()),
};
// Use the block vector to compute a (part_number, size) vector
let mut size = Vec::<(u64, u64)>::new();
blocks.iter().for_each(|(key, val)| {
let mut new_size = val.size;
match size.pop() {
Some((part_number, size)) if part_number == key.part_number => new_size += size,
Some(v) => size.push(v),
None => (),
}
size.push((key.part_number, new_size))
});
// Merge the etag vector and size vector to build a PartInfo vector
let max_parts = query.max_parts as usize;
let (mut etag_iter, mut size_iter) = (etags.iter().peekable(), size.iter().peekable());
let mut info = Vec::<PartInfo>::with_capacity(max_parts);
while info.len() < max_parts {
match (etag_iter.peek(), size_iter.peek()) {
(Some((ep, etag)), Some((sp, size))) => match ep.cmp(sp) {
Ordering::Less => {
debug!("ETag information ignored due to missing corresponding block information. Query: {:?}", query);
etag_iter.next();
}
Ordering::Equal => {
info.push(PartInfo {
etag: etag.to_string(),
timestamp: obj_version.timestamp,
part_number: *ep,
size: *size,
});
etag_iter.next();
size_iter.next();
}
Ordering::Greater => {
debug!("Block information ignored due to missing corresponding ETag information. Query: {:?}", query);
size_iter.next();
}
},
(None, None) => return Ok((info, None)),
_ => {
debug!(
"Additional block or ETag information ignored. Query: {:?}",
query
);
return Ok((info, None));
}
}
}
match info.last() {
Some(part_info) => {
let pagination = Some(part_info.part_number);
Ok((info, pagination))
}
None => Ok((info, None)),
}
}
/*
* ListQuery logic
*/
/// Determine the key from where we want to start fetch objects from the database
///
/// We choose whether the object at this key must
/// be included or excluded from the response.
/// This key can be the prefix in the base case, or intermediate
/// points in the dataset if we are continuing a previous listing.
impl ListObjectsQuery {
fn build_accumulator(&self) -> Accumulator<String, ObjectInfo> {
Accumulator::<String, ObjectInfo>::new(self.common.page_size)
}
fn begin(&self) -> Result<RangeBegin, Error> {
if self.is_v2 {
match (&self.continuation_token, &self.start_after) {
// In V2 mode, the continuation token is defined as an opaque
// string in the spec, so we can do whatever we want with it.
// In our case, it is defined as either [ or ] (for include
// representing the key to start with.
(Some(token), _) => match &token[..1] {
"[" => Ok(RangeBegin::IncludingKey {
key: String::from_utf8(base64::decode(token[1..].as_bytes())?)?,
fallback_key: None,
}),
"]" => Ok(RangeBegin::AfterKey {
key: String::from_utf8(base64::decode(token[1..].as_bytes())?)?,
}),
_ => Err(Error::BadRequest("Invalid continuation token".to_string())),
},
// StartAfter has defined semantics in the spec:
// start listing at the first key immediately after.
(_, Some(key)) => Ok(RangeBegin::AfterKey {
key: key.to_string(),
}),
// In the case where neither is specified, we start
// listing at the specified prefix. If an object has this
// exact same key, we include it. (@TODO is this correct?)
_ => Ok(RangeBegin::IncludingKey {
key: self.common.prefix.to_string(),
fallback_key: None,
}),
}
} else {
match &self.marker {
// In V1 mode, the spec defines the Marker value to mean
// the same thing as the StartAfter value in V2 mode.
Some(key) => Ok(RangeBegin::AfterKey {
key: key.to_string(),
}),
_ => Ok(RangeBegin::IncludingKey {
key: self.common.prefix.to_string(),
fallback_key: None,
}),
}
}
}
}
impl ListMultipartUploadsQuery {
fn build_accumulator(&self) -> Accumulator<Uuid, UploadInfo> {
Accumulator::<Uuid, UploadInfo>::new(self.common.page_size)
}
fn begin(&self) -> Result<RangeBegin, Error> {
match (&self.upload_id_marker, &self.key_marker) {
// If both the upload id marker and the key marker are sets,
// the spec specifies that we must start listing uploads INCLUDING the given key,
// AFTER the specified upload id (sorted in a lexicographic order).
// To enable some optimisations, we emulate "IncludingKey" by extending the upload id
// semantic. We base our reasoning on the hypothesis that S3's upload ids are opaques
// while Garage's ones are 32 bytes hex encoded which enables us to extend this query
// with a specific "include" upload id.
(Some(up_marker), Some(key_marker)) => match &up_marker[..] {
"include" => Ok(RangeBegin::IncludingKey {
key: key_marker.to_string(),
fallback_key: None,
}),
uuid => Ok(RangeBegin::AfterUpload {
key: key_marker.to_string(),
upload: s3_put::decode_upload_id(uuid)?,
}),
},
// If only the key marker is specified, the spec says that we must start listing
// uploads AFTER the specified key.
(None, Some(key_marker)) => Ok(RangeBegin::AfterKey {
key: key_marker.to_string(),
}),
_ => Ok(RangeBegin::IncludingKey {
key: self.common.prefix.to_string(),
fallback_key: None,
}),
}
}
}
/*
* Accumulator logic
*/
trait ExtractAccumulator {
fn extract<'a>(
&mut self,
query: &ListQueryCommon,
cursor: &RangeBegin,
iter: &mut Peekable<impl Iterator<Item = &'a Object>>,
) -> ExtractionResult;
}
struct Accumulator<K, V> {
common_prefixes: BTreeSet<String>,
keys: BTreeMap<K, V>,
max_capacity: usize,
}
type ObjectAccumulator = Accumulator<String, ObjectInfo>;
type UploadAccumulator = Accumulator<Uuid, UploadInfo>;
impl<K: std::cmp::Ord, V> Accumulator<K, V> {
fn new(page_size: usize) -> Accumulator<K, V> {
Accumulator {
common_prefixes: BTreeSet::<String>::new(),
keys: BTreeMap::<K, V>::new(),
max_capacity: page_size,
}
}
/// Observe the Object iterator and try to extract a single common prefix
///
/// This function can consume an arbitrary number of items as long as they share the same
/// common prefix.
fn extract_common_prefix<'a>(
&mut self,
objects: &mut Peekable<impl Iterator<Item = &'a Object>>,
query: &ListQueryCommon,
) -> Option<ExtractionResult> {
// Get the next object from the iterator
let object = objects.peek().expect("This iterator can not be empty as it is checked earlier in the code. This is a logic bug, please report it.");
// Check if this is a common prefix (requires a passed delimiter and its value in the key)
let pfx = match common_prefix(object, query) {
Some(p) => p,
None => return None,
};
// Try to register this prefix
// If not possible, we can return early
if !self.try_insert_common_prefix(pfx.to_string()) {
return Some(ExtractionResult::Filled);
}
// We consume the whole common prefix from the iterator
let mut last_pfx_key = &object.key;
loop {
last_pfx_key = match objects.peek() {
Some(o) if o.key.starts_with(pfx) => &o.key,
Some(_) => {
return Some(ExtractionResult::Extracted {
key: last_pfx_key.to_owned(),
})
}
None => {
return match key_after_prefix(pfx) {
Some(next) => Some(ExtractionResult::SkipTo {
key: next,
fallback_key: Some(last_pfx_key.to_owned()),
}),
None => Some(ExtractionResult::NoMore),
}
}
};
objects.next();
}
}
fn is_full(&mut self) -> bool {
self.keys.len() + self.common_prefixes.len() >= self.max_capacity
}
fn try_insert_common_prefix(&mut self, key: String) -> bool {
// If we already have an entry, we can continue
if self.common_prefixes.contains(&key) {
return true;
}
// Otherwise, we need to check if we can add it
match self.is_full() {
true => false,
false => {
self.common_prefixes.insert(key);
true
}
}
}
fn try_insert_entry(&mut self, key: K, value: V) -> bool {
// It is impossible to add twice a key, this is an error
assert!(!self.keys.contains_key(&key));
match self.is_full() {
true => false,
false => {
self.keys.insert(key, value);
true
}
}
}
}
impl ExtractAccumulator for ObjectAccumulator {
fn extract<'a>(
&mut self,
query: &ListQueryCommon,
_cursor: &RangeBegin,
objects: &mut Peekable<impl Iterator<Item = &'a Object>>,
) -> ExtractionResult {
if let Some(e) = self.extract_common_prefix(objects, query) {
return e;
}
let object = objects.next().expect("This iterator can not be empty as it is checked earlier in the code. This is a logic bug, please report it.");
let version = match object.versions().iter().find(|x| x.is_data()) {
Some(v) => v,
None => unreachable!(
"Expect to have objects having data due to earlier filtering. This is a logic bug."
),
};
let meta = match &version.state {
ObjectVersionState::Complete(ObjectVersionData::Inline(meta, _)) => meta,
ObjectVersionState::Complete(ObjectVersionData::FirstBlock(meta, _)) => meta,
_ => unreachable!(),
};
let info = ObjectInfo {
last_modified: version.timestamp,
size: meta.size,
etag: meta.etag.to_string(),
};
match self.try_insert_entry(object.key.clone(), info) {
true => ExtractionResult::Extracted {
key: object.key.clone(),
},
false => ExtractionResult::Filled,
}
}
}
impl ExtractAccumulator for UploadAccumulator {
/// Observe the iterator, process a single key, and try to extract one or more upload entries
///
/// This function processes a single object from the iterator that can contain an arbitrary
/// number of versions, and thus "uploads".
fn extract<'a>(
&mut self,
query: &ListQueryCommon,
cursor: &RangeBegin,
objects: &mut Peekable<impl Iterator<Item = &'a Object>>,
) -> ExtractionResult {
if let Some(e) = self.extract_common_prefix(objects, query) {
return e;
}
// Get the next object from the iterator
let object = objects.next().expect("This iterator can not be empty as it is checked earlier in the code. This is a logic bug, please report it.");
let mut uploads_for_key = object
.versions()
.iter()
.filter(|x| x.is_uploading())
.collect::<Vec<&ObjectVersion>>();
// S3 logic requires lexicographically sorted upload ids.
uploads_for_key.sort_unstable_by_key(|e| e.uuid);
// Skip results if an upload marker is provided
if let RangeBegin::AfterUpload { upload, .. } = cursor {
// Because our data are sorted, we can use a binary search to find the UUID
// or to find where it should have been added. Once this position is found,
// we use it to discard the first part of the array.
let idx = match uploads_for_key.binary_search_by(|e| e.uuid.cmp(upload)) {
// we start after the found uuid so we need to discard the pointed value.
// In the worst case, the UUID is the last element, which lead us to an empty array
// but we are never out of bound.
Ok(i) => i + 1,
// if the UUID is not found, the upload may have been discarded between the 2 request,
// this function returns where it could have been inserted,
// the pointed value is thus greater than our marker and we need to keep it.
Err(i) => i,
};
uploads_for_key = uploads_for_key[idx..].to_vec();
}
let mut iter = uploads_for_key.iter();
// The first entry is a specific case
// as it changes our result enum type
let first_upload = match iter.next() {
Some(u) => u,
None => {
return ExtractionResult::Extracted {
key: object.key.clone(),
}
}
};
let first_up_info = UploadInfo {
key: object.key.to_string(),
timestamp: first_upload.timestamp,
};
if !self.try_insert_entry(first_upload.uuid, first_up_info) {
return ExtractionResult::Filled;
}
// We can then collect the remaining uploads in a loop
let mut prev_uuid = first_upload.uuid;
for upload in iter {
let up_info = UploadInfo {
key: object.key.to_string(),
timestamp: upload.timestamp,
};
// Insert data in our accumulator
// If it is full, return information to paginate.
if !self.try_insert_entry(upload.uuid, up_info) {
return ExtractionResult::FilledAtUpload {
key: object.key.clone(),
upload: prev_uuid,
};
}
// Update our last added UUID
prev_uuid = upload.uuid;
}
// We successfully collected all the uploads
ExtractionResult::Extracted {
key: object.key.clone(),
}
}
}
/*
* Utility functions
*/
/// This is a stub for Result::into_ok_or_err that is not yet in Rust stable
fn into_ok_or_err<T>(r: Result<T, T>) -> T {
match r {
Ok(r) => r,
Err(r) => r,
}
}
/// Returns the common prefix of the object given the query prefix and delimiter
fn common_prefix<'a>(object: &'a Object, query: &ListQueryCommon) -> Option<&'a str> {
match &query.delimiter {
Some(delimiter) => object.key[query.prefix.len()..]
.find(delimiter)
.map(|i| &object.key[..query.prefix.len() + i + delimiter.len()]),
None => None,
}
}
/// URIencode a value if needed
fn uriencode_maybe(s: &str, yes: bool) -> s3_xml::Value {
if yes {
s3_xml::Value(uri_encode(s, true))
} else {
s3_xml::Value(s.to_string())
}
}
const UTF8_BEFORE_LAST_CHAR: char = '\u{10FFFE}';
/// Compute the key after the prefix
fn key_after_prefix(pfx: &str) -> Option<String> {
let mut next = pfx.to_string();
while !next.is_empty() {
let tail = next.pop().unwrap();
if tail >= char::MAX {
continue;
}
// Circumvent a limitation of RangeFrom that overflow earlier than needed
// See: https://doc.rust-lang.org/core/ops/struct.RangeFrom.html
let new_tail = if tail == UTF8_BEFORE_LAST_CHAR {
char::MAX
} else {
(tail..).nth(1).unwrap()
};
next.push(new_tail);
return Some(next);
}
None
}
/*
* Unit tests of this module
*/
#[cfg(test)]
mod tests {
use super::*;
use garage_model::version_table::*;
use garage_util::*;
use std::iter::FromIterator;
const TS: u64 = 1641394898314;
fn bucket() -> Uuid {
Uuid::from([0x42; 32])
}
fn query() -> ListMultipartUploadsQuery {
ListMultipartUploadsQuery {
common: ListQueryCommon {
prefix: "".to_string(),
delimiter: Some("/".to_string()),
page_size: 1000,
urlencode_resp: false,
bucket_name: "a".to_string(),
bucket_id: Uuid::from([0x00; 32]),
},
key_marker: None,
upload_id_marker: None,
}
}
fn objs() -> Vec<Object> {
vec![
Object::new(
bucket(),
"a/b/c".to_string(),
vec![objup_version([0x01; 32])],
),
Object::new(bucket(), "d".to_string(), vec![objup_version([0x01; 32])]),
]
}
fn objup_version(uuid: [u8; 32]) -> ObjectVersion {
ObjectVersion {
uuid: Uuid::from(uuid),
timestamp: TS,
state: ObjectVersionState::Uploading(ObjectVersionHeaders {
content_type: "text/plain".to_string(),
other: BTreeMap::<String, String>::new(),
}),
}
}
#[test]
fn test_key_after_prefix() {
assert_eq!(UTF8_BEFORE_LAST_CHAR as u32, (char::MAX as u32) - 1);
assert_eq!(key_after_prefix("a/b/").unwrap().as_str(), "a/b0");
assert_eq!(key_after_prefix("€").unwrap().as_str(), "₭");
assert_eq!(
key_after_prefix("").unwrap().as_str(),
String::from(char::from_u32(0x10FFFE).unwrap())
);
// When the last character is the biggest UTF8 char
let a = String::from_iter(['a', char::MAX].iter());
assert_eq!(key_after_prefix(a.as_str()).unwrap().as_str(), "b");
// When all characters are the biggest UTF8 char
let b = String::from_iter([char::MAX; 3].iter());
assert!(key_after_prefix(b.as_str()).is_none());
// Check utf8 surrogates
let c = String::from('\u{D7FF}');
assert_eq!(
key_after_prefix(c.as_str()).unwrap().as_str(),
String::from('\u{E000}')
);
// Check the character before the biggest one
let d = String::from('\u{10FFFE}');
assert_eq!(
key_after_prefix(d.as_str()).unwrap().as_str(),
String::from(char::MAX)
);
}
#[test]
fn test_common_prefixes() {
let mut query = query();
let objs = objs();
query.common.prefix = "a/".to_string();
assert_eq!(
common_prefix(&objs.get(0).unwrap(), &query.common),
Some("a/b/")
);
query.common.prefix = "a/b/".to_string();
assert_eq!(common_prefix(&objs.get(0).unwrap(), &query.common), None);
}
#[test]
fn test_extract_common_prefix() {
let mut query = query();
query.common.prefix = "a/".to_string();
let objs = objs();
let mut acc = UploadAccumulator::new(query.common.page_size);
let mut iter = objs.iter().peekable();
match acc.extract_common_prefix(&mut iter, &query.common) {
Some(ExtractionResult::Extracted { key }) => assert_eq!(key, "a/b/c".to_string()),
_ => panic!("wrong result"),
}
assert_eq!(acc.common_prefixes.len(), 1);
assert_eq!(acc.common_prefixes.iter().next().unwrap(), "a/b/");
}
#[test]
fn test_extract_upload() {
let objs = vec![
Object::new(
bucket(),
"b".to_string(),
vec![
objup_version([0x01; 32]),
objup_version([0x80; 32]),
objup_version([0x8f; 32]),
objup_version([0xdd; 32]),
],
),
Object::new(bucket(), "c".to_string(), vec![]),
];
let mut acc = UploadAccumulator::new(2);
let mut start = RangeBegin::AfterUpload {
key: "b".to_string(),
upload: Uuid::from([0x01; 32]),
};
let mut iter = objs.iter().peekable();
// Check the case where we skip some uploads
match acc.extract(&(query().common), &start, &mut iter) {
ExtractionResult::FilledAtUpload { key, upload } => {
assert_eq!(key, "b");
assert_eq!(upload, Uuid::from([0x8f; 32]));
}
_ => panic!("wrong result"),
};
assert_eq!(acc.keys.len(), 2);
assert_eq!(
acc.keys.get(&Uuid::from([0x80; 32])).unwrap(),
&UploadInfo {
timestamp: TS,
key: "b".to_string()
}
);
assert_eq!(
acc.keys.get(&Uuid::from([0x8f; 32])).unwrap(),
&UploadInfo {
timestamp: TS,
key: "b".to_string()
}
);
acc = UploadAccumulator::new(2);
start = RangeBegin::AfterUpload {
key: "b".to_string(),
upload: Uuid::from([0xff; 32]),
};
iter = objs.iter().peekable();
// Check the case where we skip all the uploads
match acc.extract(&(query().common), &start, &mut iter) {
ExtractionResult::Extracted { key } if key.as_str() == "b" => (),
_ => panic!("wrong result"),
};
}
#[tokio::test]
async fn test_fetch_uploads_no_result() -> Result<(), Error> {
let query = query();
let mut acc = query.build_accumulator();
let page = fetch_list_entries(
&query.common,
query.begin()?,
&mut acc,
|_, _, _| async move { Ok(vec![]) },
)
.await?;
assert_eq!(page, None);
assert_eq!(acc.common_prefixes.len(), 0);
assert_eq!(acc.keys.len(), 0);
Ok(())
}
#[tokio::test]
async fn test_fetch_uploads_basic() -> Result<(), Error> {
let query = query();
let mut acc = query.build_accumulator();
let mut fake_io = |_, _, _| async move { Ok(objs()) };
let page =
fetch_list_entries(&query.common, query.begin()?, &mut acc, &mut fake_io).await?;
assert_eq!(page, None);
assert_eq!(acc.common_prefixes.len(), 1);
assert_eq!(acc.keys.len(), 1);
assert!(acc.common_prefixes.contains("a/"));
Ok(())
}
#[tokio::test]
async fn test_fetch_uploads_advanced() -> Result<(), Error> {
let mut query = query();
query.common.page_size = 2;
let mut fake_io = |_, k: Option<String>, _| async move {
Ok(match k.as_deref() {
Some("") => vec![
Object::new(bucket(), "b/a".to_string(), vec![objup_version([0x01; 32])]),
Object::new(bucket(), "b/b".to_string(), vec![objup_version([0x01; 32])]),
Object::new(bucket(), "b/c".to_string(), vec![objup_version([0x01; 32])]),
],
Some("b0") => vec![
Object::new(bucket(), "c/a".to_string(), vec![objup_version([0x01; 32])]),
Object::new(bucket(), "c/b".to_string(), vec![objup_version([0x01; 32])]),
Object::new(bucket(), "c/c".to_string(), vec![objup_version([0x02; 32])]),
],
Some("c0") => vec![Object::new(
bucket(),
"d".to_string(),
vec![objup_version([0x01; 32])],
)],
_ => panic!("wrong value {:?}", k),
})
};
let mut acc = query.build_accumulator();
let page =
fetch_list_entries(&query.common, query.begin()?, &mut acc, &mut fake_io).await?;
assert_eq!(
page,
Some(RangeBegin::IncludingKey {
key: "c0".to_string(),
fallback_key: Some("c/c".to_string())
})
);
assert_eq!(acc.common_prefixes.len(), 2);
assert_eq!(acc.keys.len(), 0);
assert!(acc.common_prefixes.contains("b/"));
assert!(acc.common_prefixes.contains("c/"));
Ok(())
}
fn version() -> Version {
let uuid = Uuid::from([0x08; 32]);
let blocks = vec![
(
VersionBlockKey {
part_number: 1,
offset: 1,
},
VersionBlock {
hash: uuid,
size: 3,
},
),
(
VersionBlockKey {
part_number: 1,
offset: 2,
},
VersionBlock {
hash: uuid,
size: 2,
},
),
(
VersionBlockKey {
part_number: 2,
offset: 1,
},
VersionBlock {
hash: uuid,
size: 8,
},
),
(
VersionBlockKey {
part_number: 5,
offset: 1,
},
VersionBlock {
hash: uuid,
size: 7,
},
),
(
VersionBlockKey {
part_number: 8,
offset: 1,
},
VersionBlock {
hash: uuid,
size: 5,
},
),
];
let etags = vec![
(1, "etag1".to_string()),
(3, "etag2".to_string()),
(5, "etag3".to_string()),
(8, "etag4".to_string()),
(9, "etag5".to_string()),
];
Version {
bucket_id: uuid,
key: "a".to_string(),
uuid: uuid,
deleted: false.into(),
blocks: crdt::Map::<VersionBlockKey, VersionBlock>::from_iter(blocks),
parts_etags: crdt::Map::<u64, String>::from_iter(etags),
}
}
fn obj() -> Object {
Object::new(bucket(), "d".to_string(), vec![objup_version([0x08; 32])])
}
#[test]
fn test_fetch_part_info() -> Result<(), Error> {
let uuid = Uuid::from([0x08; 32]);
let mut query = ListPartsQuery {
bucket_name: "a".to_string(),
bucket_id: uuid,
key: "a".to_string(),
upload_id: "xx".to_string(),
part_number_marker: None,
max_parts: 2,
};
assert!(
fetch_part_info(&query, None, None, uuid).is_err(),
"No object and version should fail"
);
assert!(
fetch_part_info(&query, Some(obj()), None, uuid).is_err(),
"No version should faild"
);
assert!(
fetch_part_info(&query, None, Some(version()), uuid).is_err(),
"No object should fail"
);
// Start from the beginning but with limited size to trigger pagination
let (info, pagination) = fetch_part_info(&query, Some(obj()), Some(version()), uuid)?;
assert_eq!(pagination.unwrap(), 5);
assert_eq!(
info,
vec![
PartInfo {
etag: "etag1".to_string(),
timestamp: TS,
part_number: 1,
size: 5
},
PartInfo {
etag: "etag3".to_string(),
timestamp: TS,
part_number: 5,
size: 7
},
]
);
// Use previous pagination to make a new request
query.part_number_marker = Some(pagination.unwrap());
let (info, pagination) = fetch_part_info(&query, Some(obj()), Some(version()), uuid)?;
assert!(pagination.is_none());
assert_eq!(
info,
vec![PartInfo {
etag: "etag4".to_string(),
timestamp: TS,
part_number: 8,
size: 5
},]
);
// Trying to access a part that is way larger than registered ones
query.part_number_marker = Some(9999);
let (info, pagination) = fetch_part_info(&query, Some(obj()), Some(version()), uuid)?;
assert!(pagination.is_none());
assert_eq!(info, vec![]);
// Try without any limitation
query.max_parts = 1000;
query.part_number_marker = None;
let (info, pagination) = fetch_part_info(&query, Some(obj()), Some(version()), uuid)?;
assert!(pagination.is_none());
assert_eq!(
info,
vec![
PartInfo {
etag: "etag1".to_string(),
timestamp: TS,
part_number: 1,
size: 5
},
PartInfo {
etag: "etag3".to_string(),
timestamp: TS,
part_number: 5,
size: 7
},
PartInfo {
etag: "etag4".to_string(),
timestamp: TS,
part_number: 8,
size: 5
},
]
);
Ok(())
}
}
