2020-04-06 17:55:39 +00:00
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use std::sync::Arc;
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2020-04-07 22:39:07 +00:00
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use std::net::SocketAddr;
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use std::collections::VecDeque;
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2020-04-06 17:55:39 +00:00
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2020-04-07 22:39:07 +00:00
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use futures::stream::StreamExt;
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2020-04-05 21:33:42 +00:00
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use hyper::service::{make_service_fn, service_fn};
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2020-04-07 22:39:07 +00:00
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use hyper::server::conn::AddrStream;
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2020-04-05 21:33:42 +00:00
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use hyper::{Body, Method, Request, Response, Server, StatusCode};
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use futures::future::Future;
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use crate::error::Error;
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2020-04-06 17:55:39 +00:00
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use crate::membership::System;
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2020-04-07 22:39:07 +00:00
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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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2020-04-05 21:33:42 +00:00
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2020-04-06 17:55:39 +00:00
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pub async fn run_api_server(sys: Arc<System>, shutdown_signal: impl Future<Output=()>) -> Result<(), hyper::Error> {
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let addr = ([0, 0, 0, 0], sys.config.api_port).into();
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2020-04-05 21:33:42 +00:00
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2020-04-07 22:39:07 +00:00
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let service = make_service_fn(|conn: &AddrStream| {
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2020-04-06 17:55:39 +00:00
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let sys = sys.clone();
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2020-04-07 22:39:07 +00:00
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let client_addr = conn.remote_addr();
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2020-04-06 17:55:39 +00:00
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async move {
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Ok::<_, Error>(service_fn(move |req: Request<Body>| {
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let sys = sys.clone();
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2020-04-07 22:39:07 +00:00
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handler(sys, req, client_addr)
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2020-04-06 17:55:39 +00:00
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}))
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}
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});
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2020-04-05 21:33:42 +00:00
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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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2020-04-06 17:55:39 +00:00
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println!("API server listening on http://{}", addr);
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2020-04-05 21:33:42 +00:00
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graceful.await
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}
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2020-04-07 22:39:07 +00:00
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async fn handler(sys: Arc<System>, req: Request<Body>, addr: SocketAddr) -> Result<Response<Body>, Error> {
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match handler_inner(sys, req, addr).await {
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Ok(x) => Ok(x),
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Err(Error::BadRequest(e)) => {
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let mut bad_request = Response::new(Body::from(format!("{}\n", e)));
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*bad_request.status_mut() = StatusCode::BAD_REQUEST;
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Ok(bad_request)
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}
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Err(e) => {
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let mut ise = Response::new(Body::from(
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format!("Internal server error: {}\n", e)));
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*ise.status_mut() = StatusCode::INTERNAL_SERVER_ERROR;
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Ok(ise)
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}
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}
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}
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async fn handler_inner(sys: Arc<System>, 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(Response::new(Body::from(
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"TODO: implement GET object",
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)))
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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(sys, &mime_type, &bucket, &key, req.into_body()).await?;
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Ok(Response::new(Body::from(
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format!("Version UUID: {:?}", 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(sys: Arc<System>,
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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, sys.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 version = VersionMeta{
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bucket: bucket.to_string(),
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key: key.to_string(),
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timestamp: now_msec(),
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uuid: version_uuid.clone(),
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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: VersionData::DeleteMarker,
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};
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let version_who = sys.members.read().await
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.walk_ring(&version_uuid, sys.config.meta_replication_factor);
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if first_block.len() < INLINE_THRESHOLD {
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version.data = VersionData::Inline(first_block);
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version.is_complete = true;
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rpc_try_call_many(sys.clone(),
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&version_who[..],
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&Message::AdvertiseVersion(version),
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(sys.config.meta_replication_factor+1)/2,
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DEFAULT_TIMEOUT).await?;
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return Ok(version_uuid)
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}
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let first_block_hash = hash(&first_block[..]);
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version.data = VersionData::FirstBlock(first_block_hash);
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rpc_try_call_many(sys.clone(),
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&version_who[..],
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&Message::AdvertiseVersion(version.clone()),
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(sys.config.meta_replication_factor+1)/2,
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DEFAULT_TIMEOUT).await?;
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let block_meta = BlockMeta{
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version_uuid: version_uuid.clone(),
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offset: 0,
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hash: hash(&first_block[..]),
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};
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let mut next_offset = first_block.len();
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let mut put_curr_block = put_block(sys.clone(), block_meta, first_block);
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loop {
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let (_, next_block) = futures::try_join!(put_curr_block, chunker.next())?;
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if let Some(block) = next_block {
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let block_meta = BlockMeta{
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version_uuid: version_uuid.clone(),
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offset: next_offset as u64,
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hash: hash(&block[..]),
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};
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next_offset += block.len();
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put_curr_block = put_block(sys.clone(), block_meta, block);
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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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version.is_complete = true;
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rpc_try_call_many(sys.clone(),
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&version_who[..],
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&Message::AdvertiseVersion(version),
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(sys.config.meta_replication_factor+1)/2,
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DEFAULT_TIMEOUT).await?;
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Ok(version_uuid)
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}
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async fn put_block(sys: Arc<System>, meta: BlockMeta, data: Vec<u8>) -> Result<(), Error> {
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let who = sys.members.read().await
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.walk_ring(&meta.hash, sys.config.meta_replication_factor);
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rpc_try_call_many(sys.clone(),
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&who[..],
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&Message::PutBlock(PutBlockMessage{
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meta,
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data,
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}),
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(sys.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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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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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.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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self.buf.extend(&bytes[..]);
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} else {
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break;
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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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