288 lines
8.1 KiB
Rust
288 lines
8.1 KiB
Rust
use std::sync::Arc;
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use std::net::SocketAddr;
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use std::collections::VecDeque;
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use futures::stream::*;
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use hyper::service::{make_service_fn, service_fn};
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use hyper::server::conn::AddrStream;
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use hyper::{Body, Method, Request, Response, Server, StatusCode};
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use hyper::body::Bytes;
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use futures::future::Future;
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use crate::error::Error;
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use crate::data::*;
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use crate::data;
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use crate::proto::*;
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use crate::rpc_client::*;
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use crate::server::Garage;
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use crate::table::EmptySortKey;
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pub async fn run_api_server(garage: Arc<Garage>, shutdown_signal: impl Future<Output=()>) -> Result<(), hyper::Error> {
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let addr = ([0, 0, 0, 0], garage.system.config.api_port).into();
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let service = make_service_fn(|conn: &AddrStream| {
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let garage = garage.clone();
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let client_addr = conn.remote_addr();
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async move {
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Ok::<_, Error>(service_fn(move |req: Request<Body>| {
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let garage = garage.clone();
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handler(garage, req, client_addr)
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}))
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}
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});
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let server = Server::bind(&addr).serve(service);
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let graceful = server.with_graceful_shutdown(shutdown_signal);
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println!("API server listening on http://{}", addr);
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graceful.await
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}
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async fn handler(garage: Arc<Garage>, req: Request<Body>, addr: SocketAddr) -> Result<Response<Body>, Error> {
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match handler_inner(garage, req, addr).await {
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Ok(x) => Ok(x),
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Err(e) => {
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let mut http_error = Response::new(Body::from(format!("{}\n", e)));
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*http_error.status_mut() = e.http_status_code();
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Ok(http_error)
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}
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}
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}
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async fn handler_inner(garage: Arc<Garage>, req: Request<Body>, addr: SocketAddr) -> Result<Response<Body>, Error> {
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eprintln!("{} {} {}", addr, req.method(), req.uri());
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let bucket = req.headers()
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.get(hyper::header::HOST)
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.map(|x| x.to_str().map_err(Error::from))
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.unwrap_or(Err(Error::BadRequest(format!("Host: header missing"))))?
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.to_lowercase();
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let key = req.uri().path().to_string();
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match req.method() {
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&Method::GET => {
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Ok(handle_get(garage, &bucket, &key).await?)
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}
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&Method::PUT => {
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let mime_type = req.headers()
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.get(hyper::header::CONTENT_TYPE)
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.map(|x| x.to_str())
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.unwrap_or(Ok("blob"))?
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.to_string();
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let version_uuid = handle_put(garage, &mime_type, &bucket, &key, req.into_body()).await?;
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Ok(Response::new(Body::from(
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format!("{:?}\n", version_uuid),
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)))
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}
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_ => Err(Error::BadRequest(format!("Invalid method"))),
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}
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}
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async fn handle_put(garage: Arc<Garage>,
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mime_type: &str,
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bucket: &str, key: &str, body: Body)
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-> Result<UUID, Error>
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{
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let version_uuid = gen_uuid();
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let mut chunker = BodyChunker::new(body, garage.system.config.block_size);
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let first_block = match chunker.next().await? {
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Some(x) => x,
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None => return Err(Error::BadRequest(format!("Empty body"))),
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};
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let mut object = Object {
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bucket: bucket.into(),
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key: key.into(),
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versions: Vec::new(),
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};
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object.versions.push(Box::new(ObjectVersion{
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uuid: version_uuid.clone(),
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timestamp: now_msec(),
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mime_type: mime_type.to_string(),
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size: first_block.len() as u64,
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is_complete: false,
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data: ObjectVersionData::DeleteMarker,
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}));
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if first_block.len() < INLINE_THRESHOLD {
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object.versions[0].data = ObjectVersionData::Inline(first_block);
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object.versions[0].is_complete = true;
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garage.object_table.insert(&object).await?;
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return Ok(version_uuid)
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}
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let version = Version {
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version: version_uuid.clone(),
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deleted: false,
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blocks: Vec::new(),
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bucket: bucket.into(),
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key: key.into(),
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};
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let first_block_hash = hash(&first_block[..]);
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object.versions[0].data = ObjectVersionData::FirstBlock(first_block_hash.clone());
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garage.object_table.insert(&object).await?;
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let mut next_offset = first_block.len();
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let mut put_curr_version_block = put_version_block(garage.clone(), &version, 0, first_block_hash.clone());
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let mut put_curr_block = put_block(garage.clone(), first_block_hash, first_block);
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loop {
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let (_, _, next_block) = futures::try_join!(put_curr_block, put_curr_version_block, chunker.next())?;
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if let Some(block) = next_block {
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let block_hash = hash(&block[..]);
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let block_len = block.len();
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put_curr_version_block = put_version_block(garage.clone(), &version, next_offset as u64, block_hash.clone());
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put_curr_block = put_block(garage.clone(), block_hash, block);
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next_offset += block_len;
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} else {
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break;
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}
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}
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// TODO: if at any step we have an error, we should undo everything we did
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object.versions[0].is_complete = true;
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object.versions[0].size = next_offset as u64;
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garage.object_table.insert(&object).await?;
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Ok(version_uuid)
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}
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async fn put_version_block(garage: Arc<Garage>, version: &Version, offset: u64, hash: Hash) -> Result<(), Error> {
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let mut version = version.clone();
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version.blocks.push(VersionBlock{
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offset,
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hash,
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});
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garage.version_table.insert(&version).await?;
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Ok(())
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}
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async fn put_block(garage: Arc<Garage>, hash: Hash, data: Vec<u8>) -> Result<(), Error> {
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let who = garage.system.members.read().await
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.walk_ring(&hash, garage.system.config.meta_replication_factor);
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rpc_try_call_many(garage.system.clone(),
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&who[..],
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&Message::PutBlock(PutBlockMessage{
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hash,
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data,
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}),
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(garage.system.config.meta_replication_factor+1)/2,
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DEFAULT_TIMEOUT).await?;
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Ok(())
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}
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struct BodyChunker {
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body: Body,
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read_all: bool,
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block_size: usize,
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buf: VecDeque<u8>,
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}
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impl BodyChunker {
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fn new(body: Body, block_size: usize) -> Self {
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Self{
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body,
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read_all: false,
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block_size,
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buf: VecDeque::new(),
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}
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}
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async fn next(&mut self) -> Result<Option<Vec<u8>>, Error> {
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while !self.read_all && self.buf.len() < self.block_size {
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if let Some(block) = self.body.next().await {
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let bytes = block?;
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eprintln!("Body next: {} bytes", bytes.len());
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self.buf.extend(&bytes[..]);
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} else {
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self.read_all = true;
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}
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}
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if self.buf.len() == 0 {
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Ok(None)
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} else if self.buf.len() <= self.block_size {
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let block = self.buf.drain(..)
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.collect::<Vec<u8>>();
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Ok(Some(block))
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} else {
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let block = self.buf.drain(..self.block_size)
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.collect::<Vec<u8>>();
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Ok(Some(block))
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}
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}
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}
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async fn handle_get(garage: Arc<Garage>, bucket: &str, key: &str) -> Result<Response<Body>, Error> {
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let mut object = match garage.object_table.get(&bucket.to_string(), &key.to_string()).await? {
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None => return Err(Error::NotFound),
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Some(o) => o
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};
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let last_v = match object.versions.drain(..)
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.rev().filter(|v| v.is_complete)
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.next() {
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Some(v) => v,
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None => return Err(Error::NotFound),
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};
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let resp_builder = Response::builder()
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.header("Content-Type", last_v.mime_type)
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.status(StatusCode::OK);
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match last_v.data {
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ObjectVersionData::DeleteMarker => Err(Error::NotFound),
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ObjectVersionData::Inline(bytes) => {
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Ok(resp_builder.body(bytes.into())?)
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}
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ObjectVersionData::FirstBlock(first_block_hash) => {
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let read_first_block = get_block(garage.clone(), &first_block_hash);
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let get_next_blocks = garage.version_table.get(&last_v.uuid, &EmptySortKey);
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let (first_block, version) = futures::try_join!(read_first_block, get_next_blocks)?;
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let version = match version {
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Some(v) => v,
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None => return Err(Error::NotFound),
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};
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let mut blocks = version.blocks.iter()
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.map(|vb| (vb.hash.clone(), None))
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.collect::<Vec<_>>();
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blocks[0].1 = Some(first_block);
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let block_futures = blocks.drain(..)
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.map(move |(hash, data_opt)| async {
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if let Some(data) = data_opt {
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Ok(data)
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} else {
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get_block(garage.clone(), &hash).await
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.map_err(|e| format!("{}", e))
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}
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});
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let body_stream = futures::stream::iter(block_futures).buffered(2);
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let body = Body::wrap_stream(body_stream);
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Ok(resp_builder.body(body)?)
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}
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}
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}
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async fn get_block(garage: Arc<Garage>, hash: &Hash) -> Result<Vec<u8>, Error> {
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let who = garage.system.members.read().await
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.walk_ring(&hash, garage.system.config.meta_replication_factor);
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let resps = rpc_try_call_many(garage.system.clone(),
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&who[..],
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&Message::GetBlock(hash.clone()),
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1,
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DEFAULT_TIMEOUT).await?;
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for resp in resps {
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if let Message::PutBlock(pbm) = resp {
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if data::hash(&pbm.data) == *hash {
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return Ok(pbm.data)
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}
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}
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}
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Err(Error::Message(format!("No valid blocks returned")))
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}
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