//! 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_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, ) -> Option> { // 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, req: &Request, bucket: &str, key: &str, ) -> Result, Error> { let object = garage .object_table .get(&bucket.to_string(), &key.to_string()) .await? .ok_or(Error::NotFound)?; let version = object .versions() .iter() .rev() .find(|v| v.is_data()) .ok_or(Error::NotFound)?; 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, req: &Request, bucket: &str, key: &str, ) -> Result, Error> { let object = garage .object_table .get(&bucket.to_string(), &key.to_string()) .await? .ok_or(Error::NotFound)?; let last_v = object .versions() .iter() .rev() .find(|v| v.is_complete()) .ok_or(Error::NotFound)?; 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::NotFound), 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)?; if ranges.len() > 1 { return Err(Error::BadRequest( "Multiple ranges not supported".to_string(), )); } 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::NotFound)?; let mut blocks = version .blocks .items() .iter() .map(|(_, vb)| (vb.hash, None)) .collect::>(); 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, version: &ObjectVersion, version_data: &ObjectVersionData, version_meta: &ObjectVersionMeta, begin: u64, end: u64, ) -> Result, Error> { if end > version_meta.size { return Err(Error::BadRequest("Range not included in file".to_string())); } 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::NotFound), }; // 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::::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)?) } } }