use core::pin::Pin; use core::task::{Context, Poll}; use std::collections::VecDeque; use std::net::SocketAddr; use std::sync::Arc; use futures::future::Future; use futures::ready; use futures::stream::*; use hyper::body::{Bytes, HttpBody}; use hyper::server::conn::AddrStream; use hyper::service::{make_service_fn, service_fn}; use hyper::{Body, Method, Request, Response, Server, StatusCode}; use crate::data; use crate::data::*; use crate::error::Error; use crate::proto::*; use crate::rpc_client::*; use crate::server::Garage; use crate::table::EmptySortKey; type BodyType = Box + Send + Unpin>; pub async fn run_api_server( garage: Arc, shutdown_signal: impl Future, ) -> Result<(), hyper::Error> { let addr = ([0, 0, 0, 0], garage.system.config.api_port).into(); let service = make_service_fn(|conn: &AddrStream| { let garage = garage.clone(); let client_addr = conn.remote_addr(); async move { Ok::<_, Error>(service_fn(move |req: Request| { let garage = garage.clone(); handler(garage, req, client_addr) })) } }); let server = Server::bind(&addr).serve(service); let graceful = server.with_graceful_shutdown(shutdown_signal); println!("API server listening on http://{}", addr); graceful.await } async fn handler( garage: Arc, req: Request, addr: SocketAddr, ) -> Result, Error> { match handler_inner(garage, req, addr).await { Ok(x) => Ok(x), Err(e) => { let body: BodyType = Box::new(BytesBody::from(format!("{}\n", e))); let mut http_error = Response::new(body); *http_error.status_mut() = e.http_status_code(); Ok(http_error) } } } async fn handler_inner( garage: Arc, req: Request, addr: SocketAddr, ) -> Result, Error> { eprintln!("{} {} {}", addr, req.method(), req.uri()); let bucket = req .headers() .get(hyper::header::HOST) .map(|x| x.to_str().map_err(Error::from)) .unwrap_or(Err(Error::BadRequest(format!("Host: header missing"))))? .to_lowercase(); let key = req.uri().path().to_string(); match req.method() { &Method::GET => Ok(handle_get(garage, &bucket, &key).await?), &Method::PUT => { let mime_type = req .headers() .get(hyper::header::CONTENT_TYPE) .map(|x| x.to_str()) .unwrap_or(Ok("blob"))? .to_string(); let version_uuid = handle_put(garage, &mime_type, &bucket, &key, req.into_body()).await?; Ok(Response::new(Box::new(BytesBody::from(format!( "{:?}\n", version_uuid ))))) } _ => Err(Error::BadRequest(format!("Invalid method"))), } } async fn handle_put( garage: Arc, mime_type: &str, bucket: &str, key: &str, body: Body, ) -> Result { let version_uuid = gen_uuid(); let mut chunker = BodyChunker::new(body, garage.system.config.block_size); let first_block = match chunker.next().await? { Some(x) => x, None => return Err(Error::BadRequest(format!("Empty body"))), }; let mut object = Object { bucket: bucket.into(), key: key.into(), versions: Vec::new(), }; object.versions.push(Box::new(ObjectVersion { uuid: version_uuid.clone(), 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.versions[0].data = ObjectVersionData::Inline(first_block); object.versions[0].is_complete = true; garage.object_table.insert(&object).await?; return Ok(version_uuid); } let version = Version { version: version_uuid.clone(), deleted: false, blocks: Vec::new(), bucket: bucket.into(), key: key.into(), }; let first_block_hash = hash(&first_block[..]); object.versions[0].data = ObjectVersionData::FirstBlock(first_block_hash.clone()); garage.object_table.insert(&object).await?; let mut next_offset = first_block.len(); let mut put_curr_version_block = put_version_block(garage.clone(), &version, 0, first_block_hash.clone()); let mut put_curr_block = put_block(garage.clone(), 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_version_block( garage.clone(), &version, next_offset as u64, block_hash.clone(), ); put_curr_block = put_block(garage.clone(), 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.versions[0].is_complete = true; object.versions[0].size = next_offset as u64; garage.object_table.insert(&object).await?; Ok(version_uuid) } async fn put_version_block( garage: Arc, version: &Version, offset: u64, hash: Hash, ) -> Result<(), Error> { let mut version = version.clone(); version.blocks.push(VersionBlock { offset, hash }); garage.version_table.insert(&version).await?; Ok(()) } async fn put_block(garage: Arc, hash: Hash, data: Vec) -> Result<(), Error> { let who = garage .system .members .read() .await .walk_ring(&hash, garage.system.config.meta_replication_factor); rpc_try_call_many( garage.system.clone(), &who[..], &Message::PutBlock(PutBlockMessage { hash, data }), (garage.system.config.meta_replication_factor + 1) / 2, DEFAULT_TIMEOUT, ) .await?; Ok(()) } struct BodyChunker { body: Body, read_all: bool, block_size: usize, buf: VecDeque, } 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>, Error> { while !self.read_all && self.buf.len() < self.block_size { if let Some(block) = self.body.next().await { let bytes = block?; eprintln!("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::>(); Ok(Some(block)) } else { let block = self.buf.drain(..self.block_size).collect::>(); Ok(Some(block)) } } } async fn handle_get( garage: Arc, bucket: &str, key: &str, ) -> Result, Error> { let mut object = match garage .object_table .get(&bucket.to_string(), &key.to_string()) .await? { None => return Err(Error::NotFound), Some(o) => o, }; let last_v = match object .versions .drain(..) .rev() .filter(|v| v.is_complete) .next() { Some(v) => v, None => return Err(Error::NotFound), }; let resp_builder = Response::builder() .header("Content-Type", last_v.mime_type) .status(StatusCode::OK); match last_v.data { ObjectVersionData::DeleteMarker => Err(Error::NotFound), ObjectVersionData::Inline(bytes) => { let body: BodyType = Box::new(BytesBody::from(bytes)); Ok(resp_builder.body(body)?) } ObjectVersionData::FirstBlock(first_block_hash) => { let read_first_block = get_block(garage.clone(), &first_block_hash); let get_next_blocks = garage.version_table.get(&last_v.uuid, &EmptySortKey); let (first_block, version) = futures::try_join!(read_first_block, get_next_blocks)?; let version = match version { Some(v) => v, None => return Err(Error::NotFound), }; let mut blocks = version .blocks .iter() .map(|vb| (vb.hash.clone(), 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 { get_block(garage.clone(), &hash).await.map(Bytes::from) } } }) .buffered(2); let body: BodyType = Box::new(NonSyncStreamBody { stream: Box::pin(body_stream), }); Ok(resp_builder.body(body)?) } } } async fn get_block(garage: Arc, hash: &Hash) -> Result, Error> { let who = garage .system .members .read() .await .walk_ring(&hash, garage.system.config.meta_replication_factor); let resps = rpc_try_call_many( garage.system.clone(), &who[..], &Message::GetBlock(hash.clone()), 1, DEFAULT_TIMEOUT, ) .await?; for resp in resps { if let Message::PutBlock(pbm) = resp { if data::hash(&pbm.data) == *hash { return Ok(pbm.data); } } } Err(Error::Message(format!("No valid blocks returned"))) } pub struct NonSyncStreamBody { pub stream: Pin> + Send>>, } impl HttpBody for NonSyncStreamBody { type Data = Bytes; type Error = Error; fn poll_data( mut self: Pin<&mut Self>, cx: &mut Context, ) -> Poll>> { match ready!(self.stream.as_mut().poll_next(cx)) { Some(res) => Poll::Ready(Some(res)), None => Poll::Ready(None), } } fn poll_trailers( self: Pin<&mut Self>, cx: &mut Context, ) -> Poll>, Self::Error>> { Poll::Ready(Ok(None)) } } pub struct BytesBody { pub bytes: Option, } impl HttpBody for BytesBody { type Data = Bytes; type Error = Error; fn poll_data( mut self: Pin<&mut Self>, _cx: &mut Context, ) -> Poll>> { Poll::Ready(self.bytes.take().map(Ok)) } fn poll_trailers( self: Pin<&mut Self>, _cx: &mut Context, ) -> Poll>, Self::Error>> { Poll::Ready(Ok(None)) } } impl From for BytesBody { fn from(x: String) -> BytesBody { BytesBody { bytes: Some(Bytes::from(x.into_bytes())), } } } impl From> for BytesBody { fn from(x: Vec) -> BytesBody { BytesBody { bytes: Some(Bytes::from(x)), } } }