use std::collections::VecDeque; use std::net::SocketAddr; use std::sync::Arc; use futures::future::Future; 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::error::Error; use crate::server::Garage; use crate::table::EmptyKey; use crate::store::block::INLINE_THRESHOLD; use crate::store::block_ref_table::*; use crate::store::object_table::*; use crate::store::version_table::*; use crate::api::http_util::*; type BodyType = Box + Send + Unpin>; pub async fn run_api_server( garage: Arc, shutdown_signal: impl Future, ) -> Result<(), Error> { let addr = &garage.config.api_bind_addr; 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); info!("API server listening on http://{}", addr); graceful.await?; Ok(()) } 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> { info!("{} {} {}", 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?; let response = format!("{}\n", hex::encode(version_uuid,)); Ok(Response::new(Box::new(BytesBody::from(response)))) } &Method::DELETE => { let version_uuid = handle_delete(garage, &bucket, &key).await?; let response = format!("{}\n", hex::encode(version_uuid,)); Ok(Response::new(Box::new(BytesBody::from(response)))) } _ => 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.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, 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 { uuid: version_uuid, 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); garage.object_table.insert(&object).await?; let mut next_offset = first_block.len(); let mut put_curr_version_block = put_block_meta(garage.clone(), &version, 0, first_block_hash); let mut put_curr_block = garage .block_manager .rpc_put_block(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_block_meta(garage.clone(), &version, next_offset as u64, block_hash); put_curr_block = garage.block_manager.rpc_put_block(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_block_meta( garage: Arc, version: &Version, offset: u64, hash: Hash, ) -> Result<(), Error> { let mut version = version.clone(); version.blocks.push(VersionBlock { offset, hash: hash }); let block_ref = BlockRef { block: hash, version: version.uuid, deleted: false, }; futures::try_join!( garage.version_table.insert(&version), garage.block_ref_table.insert(&block_ref), )?; 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?; trace!("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_delete(garage: Arc, bucket: &str, key: &str) -> Result { let exists = match garage .object_table .get(&bucket.to_string(), &key.to_string()) .await? { None => false, Some(o) => { let mut has_active_version = false; for v in o.versions.iter() { if v.data != ObjectVersionData::DeleteMarker { has_active_version = true; break; } } has_active_version } }; if !exists { // No need to delete return Ok([0u8; 32].into()); } let version_uuid = gen_uuid(); let mut object = Object { bucket: bucket.into(), key: key.into(), versions: Vec::new(), }; object.versions.push(Box::new(ObjectVersion { uuid: version_uuid, timestamp: now_msec(), mime_type: "application/x-delete-marker".into(), size: 0, is_complete: true, data: ObjectVersionData::DeleteMarker, })); garage.object_table.insert(&object).await?; return Ok(version_uuid); } 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 = 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 = match version { Some(v) => v, None => return Err(Error::NotFound), }; let mut blocks = version .blocks .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: BodyType = Box::new(StreamBody::new(Box::pin(body_stream))); Ok(resp_builder.body(body)?) } } }