315 lines
8.6 KiB
Rust
315 lines
8.6 KiB
Rust
//! Function related to GET and HEAD requests
|
|
use std::sync::Arc;
|
|
use std::time::{Duration, UNIX_EPOCH};
|
|
|
|
use futures::stream::*;
|
|
use hyper::body::Bytes;
|
|
use hyper::{Body, Request, Response, StatusCode};
|
|
|
|
use garage_table::EmptyKey;
|
|
use garage_util::data::*;
|
|
|
|
use garage_model::garage::Garage;
|
|
use garage_model::object_table::*;
|
|
|
|
use crate::error::*;
|
|
|
|
fn object_headers(
|
|
version: &ObjectVersion,
|
|
version_meta: &ObjectVersionMeta,
|
|
) -> http::response::Builder {
|
|
debug!("Version meta: {:?}", version_meta);
|
|
|
|
let date = UNIX_EPOCH + Duration::from_millis(version.timestamp);
|
|
let date_str = httpdate::fmt_http_date(date);
|
|
|
|
let mut resp = Response::builder()
|
|
.header(
|
|
"Content-Type",
|
|
version_meta.headers.content_type.to_string(),
|
|
)
|
|
.header("Last-Modified", date_str)
|
|
.header("Accept-Ranges", "bytes".to_string());
|
|
|
|
if !version_meta.etag.is_empty() {
|
|
resp = resp.header("ETag", format!("\"{}\"", version_meta.etag));
|
|
}
|
|
|
|
for (k, v) in version_meta.headers.other.iter() {
|
|
resp = resp.header(k, v.to_string());
|
|
}
|
|
|
|
resp
|
|
}
|
|
|
|
fn try_answer_cached(
|
|
version: &ObjectVersion,
|
|
version_meta: &ObjectVersionMeta,
|
|
req: &Request<Body>,
|
|
) -> Option<Response<Body>> {
|
|
// <trinity> It is possible, and is even usually the case, [that both If-None-Match and
|
|
// If-Modified-Since] are present in a request. In this situation If-None-Match takes
|
|
// precedence and If-Modified-Since is ignored (as per 6.Precedence from rfc7232). The rational
|
|
// being that etag based matching is more accurate, it has no issue with sub-second precision
|
|
// for instance (in case of very fast updates)
|
|
let cached = if let Some(none_match) = req.headers().get(http::header::IF_NONE_MATCH) {
|
|
let none_match = none_match.to_str().ok()?;
|
|
let expected = format!("\"{}\"", version_meta.etag);
|
|
let found = none_match
|
|
.split(',')
|
|
.map(str::trim)
|
|
.any(|etag| etag == expected || etag == "\"*\"");
|
|
found
|
|
} else if let Some(modified_since) = req.headers().get(http::header::IF_MODIFIED_SINCE) {
|
|
let modified_since = modified_since.to_str().ok()?;
|
|
let client_date = httpdate::parse_http_date(modified_since).ok()?;
|
|
let server_date = UNIX_EPOCH + Duration::from_millis(version.timestamp);
|
|
client_date >= server_date
|
|
} else {
|
|
false
|
|
};
|
|
|
|
if cached {
|
|
Some(
|
|
Response::builder()
|
|
.status(StatusCode::NOT_MODIFIED)
|
|
.body(Body::empty())
|
|
.unwrap(),
|
|
)
|
|
} else {
|
|
None
|
|
}
|
|
}
|
|
|
|
/// Handle HEAD request
|
|
pub async fn handle_head(
|
|
garage: Arc<Garage>,
|
|
req: &Request<Body>,
|
|
bucket_id: Uuid,
|
|
key: &str,
|
|
) -> Result<Response<Body>, Error> {
|
|
let object = garage
|
|
.object_table
|
|
.get(&bucket_id, &key.to_string())
|
|
.await?
|
|
.ok_or(Error::NoSuchKey)?;
|
|
|
|
let version = object
|
|
.versions()
|
|
.iter()
|
|
.rev()
|
|
.find(|v| v.is_data())
|
|
.ok_or(Error::NoSuchKey)?;
|
|
|
|
let version_meta = match &version.state {
|
|
ObjectVersionState::Complete(ObjectVersionData::Inline(meta, _)) => meta,
|
|
ObjectVersionState::Complete(ObjectVersionData::FirstBlock(meta, _)) => meta,
|
|
_ => unreachable!(),
|
|
};
|
|
|
|
if let Some(cached) = try_answer_cached(version, version_meta, req) {
|
|
return Ok(cached);
|
|
}
|
|
|
|
let body: Body = Body::empty();
|
|
let response = object_headers(version, version_meta)
|
|
.header("Content-Length", format!("{}", version_meta.size))
|
|
.status(StatusCode::OK)
|
|
.body(body)
|
|
.unwrap();
|
|
Ok(response)
|
|
}
|
|
|
|
/// Handle GET request
|
|
pub async fn handle_get(
|
|
garage: Arc<Garage>,
|
|
req: &Request<Body>,
|
|
bucket_id: Uuid,
|
|
key: &str,
|
|
) -> Result<Response<Body>, Error> {
|
|
let object = garage
|
|
.object_table
|
|
.get(&bucket_id, &key.to_string())
|
|
.await?
|
|
.ok_or(Error::NoSuchKey)?;
|
|
|
|
let last_v = object
|
|
.versions()
|
|
.iter()
|
|
.rev()
|
|
.find(|v| v.is_complete())
|
|
.ok_or(Error::NoSuchKey)?;
|
|
|
|
let last_v_data = match &last_v.state {
|
|
ObjectVersionState::Complete(x) => x,
|
|
_ => unreachable!(),
|
|
};
|
|
let last_v_meta = match last_v_data {
|
|
ObjectVersionData::DeleteMarker => return Err(Error::NoSuchKey),
|
|
ObjectVersionData::Inline(meta, _) => meta,
|
|
ObjectVersionData::FirstBlock(meta, _) => meta,
|
|
};
|
|
|
|
if let Some(cached) = try_answer_cached(last_v, last_v_meta, req) {
|
|
return Ok(cached);
|
|
}
|
|
|
|
let range = match req.headers().get("range") {
|
|
Some(range) => {
|
|
let range_str = range.to_str()?;
|
|
let mut ranges = http_range::HttpRange::parse(range_str, last_v_meta.size)
|
|
.map_err(|e| (e, last_v_meta.size))?;
|
|
if ranges.len() > 1 {
|
|
// garage does not support multi-range requests yet, so we respond with the entire
|
|
// object when multiple ranges are requested
|
|
None
|
|
} else {
|
|
ranges.pop()
|
|
}
|
|
}
|
|
None => None,
|
|
};
|
|
if let Some(range) = range {
|
|
return handle_get_range(
|
|
garage,
|
|
last_v,
|
|
last_v_data,
|
|
last_v_meta,
|
|
range.start,
|
|
range.start + range.length,
|
|
)
|
|
.await;
|
|
}
|
|
|
|
let resp_builder = object_headers(last_v, last_v_meta)
|
|
.header("Content-Length", format!("{}", last_v_meta.size))
|
|
.status(StatusCode::OK);
|
|
|
|
match &last_v_data {
|
|
ObjectVersionData::DeleteMarker => unreachable!(),
|
|
ObjectVersionData::Inline(_, bytes) => {
|
|
let body: Body = Body::from(bytes.to_vec());
|
|
Ok(resp_builder.body(body)?)
|
|
}
|
|
ObjectVersionData::FirstBlock(_, first_block_hash) => {
|
|
let read_first_block = garage.block_manager.rpc_get_block(first_block_hash);
|
|
let get_next_blocks = garage.version_table.get(&last_v.uuid, &EmptyKey);
|
|
|
|
let (first_block, version) = futures::try_join!(read_first_block, get_next_blocks)?;
|
|
let version = version.ok_or(Error::NoSuchKey)?;
|
|
|
|
let mut blocks = version
|
|
.blocks
|
|
.items()
|
|
.iter()
|
|
.map(|(_, vb)| (vb.hash, None))
|
|
.collect::<Vec<_>>();
|
|
blocks[0].1 = Some(first_block);
|
|
|
|
let body_stream = futures::stream::iter(blocks)
|
|
.map(move |(hash, data_opt)| {
|
|
let garage = garage.clone();
|
|
async move {
|
|
if let Some(data) = data_opt {
|
|
Ok(Bytes::from(data))
|
|
} else {
|
|
garage
|
|
.block_manager
|
|
.rpc_get_block(&hash)
|
|
.await
|
|
.map(Bytes::from)
|
|
}
|
|
}
|
|
})
|
|
.buffered(2);
|
|
|
|
let body = hyper::body::Body::wrap_stream(body_stream);
|
|
Ok(resp_builder.body(body)?)
|
|
}
|
|
}
|
|
}
|
|
|
|
async fn handle_get_range(
|
|
garage: Arc<Garage>,
|
|
version: &ObjectVersion,
|
|
version_data: &ObjectVersionData,
|
|
version_meta: &ObjectVersionMeta,
|
|
begin: u64,
|
|
end: u64,
|
|
) -> Result<Response<Body>, Error> {
|
|
let resp_builder = object_headers(version, version_meta)
|
|
.header("Content-Length", format!("{}", end - begin))
|
|
.header(
|
|
"Content-Range",
|
|
format!("bytes {}-{}/{}", begin, end - 1, version_meta.size),
|
|
)
|
|
.status(StatusCode::PARTIAL_CONTENT);
|
|
|
|
match &version_data {
|
|
ObjectVersionData::DeleteMarker => unreachable!(),
|
|
ObjectVersionData::Inline(_meta, bytes) => {
|
|
if end as usize <= bytes.len() {
|
|
let body: Body = Body::from(bytes[begin as usize..end as usize].to_vec());
|
|
Ok(resp_builder.body(body)?)
|
|
} else {
|
|
None.ok_or_internal_error(
|
|
"Requested range not present in inline bytes when it should have been",
|
|
)
|
|
}
|
|
}
|
|
ObjectVersionData::FirstBlock(_meta, _first_block_hash) => {
|
|
let version = garage.version_table.get(&version.uuid, &EmptyKey).await?;
|
|
let version = match version {
|
|
Some(v) => v,
|
|
None => return Err(Error::NoSuchKey),
|
|
};
|
|
|
|
// We will store here the list of blocks that have an intersection with the requested
|
|
// range, as well as their "true offset", which is their actual offset in the complete
|
|
// file (whereas block.offset designates the offset of the block WITHIN THE PART
|
|
// block.part_number, which is not the same in the case of a multipart upload)
|
|
let mut blocks = Vec::with_capacity(std::cmp::min(
|
|
version.blocks.len(),
|
|
4 + ((end - begin) / std::cmp::max(version.blocks.items()[0].1.size as u64, 1024))
|
|
as usize,
|
|
));
|
|
let mut true_offset = 0;
|
|
for (_, b) in version.blocks.items().iter() {
|
|
if true_offset >= end {
|
|
break;
|
|
}
|
|
// Keep only blocks that have an intersection with the requested range
|
|
if true_offset < end && true_offset + b.size > begin {
|
|
blocks.push((*b, true_offset));
|
|
}
|
|
true_offset += b.size;
|
|
}
|
|
|
|
let body_stream = futures::stream::iter(blocks)
|
|
.map(move |(block, true_offset)| {
|
|
let garage = garage.clone();
|
|
async move {
|
|
let data = garage.block_manager.rpc_get_block(&block.hash).await?;
|
|
let data = Bytes::from(data);
|
|
let start_in_block = if true_offset > begin {
|
|
0
|
|
} else {
|
|
begin - true_offset
|
|
};
|
|
let end_in_block = if true_offset + block.size < end {
|
|
block.size
|
|
} else {
|
|
end - true_offset
|
|
};
|
|
Result::<Bytes, Error>::Ok(
|
|
data.slice(start_in_block as usize..end_in_block as usize),
|
|
)
|
|
}
|
|
})
|
|
.buffered(2);
|
|
|
|
let body = hyper::body::Body::wrap_stream(body_stream);
|
|
Ok(resp_builder.body(body)?)
|
|
}
|
|
}
|
|
}
|