use std::sync::Arc;
use std::net::SocketAddr;
use std::collections::VecDeque;
use futures::stream::StreamExt;
use hyper::service::{make_service_fn, service_fn};
use hyper::server::conn::AddrStream;
use hyper::{Body, Method, Request, Response, Server, StatusCode};
use futures::future::Future;
use crate::error::Error;
use crate::membership::System;
use crate::data::*;
use crate::proto::*;
use crate::rpc_client::*;
pub async fn run_api_server(sys: Arc<System>, shutdown_signal: impl Future<Output=()>) -> Result<(), hyper::Error> {
let addr = ([0, 0, 0, 0], sys.config.api_port).into();
let service = make_service_fn(|conn: &AddrStream| {
let sys = sys.clone();
let client_addr = conn.remote_addr();
async move {
Ok::<_, Error>(service_fn(move |req: Request<Body>| {
let sys = sys.clone();
handler(sys, 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(sys: Arc<System>, req: Request<Body>, addr: SocketAddr) -> Result<Response<Body>, Error> {
match handler_inner(sys, req, addr).await {
Ok(x) => Ok(x),
Err(Error::BadRequest(e)) => {
let mut bad_request = Response::new(Body::from(format!("{}\n", e)));
*bad_request.status_mut() = StatusCode::BAD_REQUEST;
Ok(bad_request)
}
Err(e) => {
let mut ise = Response::new(Body::from(
format!("Internal server error: {}\n", e)));
*ise.status_mut() = StatusCode::INTERNAL_SERVER_ERROR;
Ok(ise)
}
}
}
async fn handler_inner(sys: Arc<System>, req: Request<Body>, addr: SocketAddr) -> Result<Response<Body>, 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(Response::new(Body::from(
"TODO: implement GET object",
)))
}
&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(sys, &mime_type, &bucket, &key, req.into_body()).await?;
Ok(Response::new(Body::from(
format!("Version UUID: {:?}", version_uuid),
)))
}
_ => Err(Error::BadRequest(format!("Invalid method"))),
}
}
async fn handle_put(sys: Arc<System>,
mime_type: &str,
bucket: &str, key: &str, body: Body)
-> Result<UUID, Error>
{
let version_uuid = gen_uuid();
let mut chunker = BodyChunker::new(body, sys.config.block_size);
let first_block = match chunker.next().await? {
Some(x) => x,
None => return Err(Error::BadRequest(format!("Empty body"))),
};
let mut version = VersionMeta{
bucket: bucket.to_string(),
key: key.to_string(),
timestamp: now_msec(),
uuid: version_uuid.clone(),
mime_type: mime_type.to_string(),
size: first_block.len() as u64,
is_complete: false,
data: VersionData::DeleteMarker,
};
let version_who = sys.members.read().await
.walk_ring(&version_uuid, sys.config.meta_replication_factor);
if first_block.len() < INLINE_THRESHOLD {
version.data = VersionData::Inline(first_block);
version.is_complete = true;
rpc_try_call_many(sys.clone(),
&version_who[..],
&Message::AdvertiseVersion(version),
(sys.config.meta_replication_factor+1)/2,
DEFAULT_TIMEOUT).await?;
return Ok(version_uuid)
}
let first_block_hash = hash(&first_block[..]);
version.data = VersionData::FirstBlock(first_block_hash);
rpc_try_call_many(sys.clone(),
&version_who[..],
&Message::AdvertiseVersion(version.clone()),
(sys.config.meta_replication_factor+1)/2,
DEFAULT_TIMEOUT).await?;
let block_meta = BlockMeta{
version_uuid: version_uuid.clone(),
offset: 0,
hash: hash(&first_block[..]),
};
let mut next_offset = first_block.len();
let mut put_curr_block = put_block(sys.clone(), block_meta, first_block);
loop {
let (_, next_block) = futures::try_join!(put_curr_block, chunker.next())?;
if let Some(block) = next_block {
let block_meta = BlockMeta{
version_uuid: version_uuid.clone(),
offset: next_offset as u64,
hash: hash(&block[..]),
};
next_offset += block.len();
put_curr_block = put_block(sys.clone(), block_meta, block);
} else {
break;
}
}
// TODO: if at any step we have an error, we should undo everything we did
version.is_complete = true;
rpc_try_call_many(sys.clone(),
&version_who[..],
&Message::AdvertiseVersion(version),
(sys.config.meta_replication_factor+1)/2,
DEFAULT_TIMEOUT).await?;
Ok(version_uuid)
}
async fn put_block(sys: Arc<System>, meta: BlockMeta, data: Vec<u8>) -> Result<(), Error> {
let who = sys.members.read().await
.walk_ring(&meta.hash, sys.config.meta_replication_factor);
rpc_try_call_many(sys.clone(),
&who[..],
&Message::PutBlock(PutBlockMessage{
meta,
data,
}),
(sys.config.meta_replication_factor+1)/2,
DEFAULT_TIMEOUT).await?;
Ok(())
}
struct BodyChunker {
body: Body,
block_size: usize,
buf: VecDeque<u8>,
}
impl BodyChunker {
fn new(body: Body, block_size: usize) -> Self {
Self{
body,
block_size,
buf: VecDeque::new(),
}
}
async fn next(&mut self) -> Result<Option<Vec<u8>>, Error> {
while self.buf.len() < self.block_size {
if let Some(block) = self.body.next().await {
let bytes = block?;
self.buf.extend(&bytes[..]);
} else {
break;
}
}
if self.buf.len() == 0 {
Ok(None)
} else if self.buf.len() <= self.block_size {
let block = self.buf.drain(..)
.collect::<Vec<u8>>();
Ok(Some(block))
} else {
let block = self.buf.drain(..self.block_size)
.collect::<Vec<u8>>();
Ok(Some(block))
}
}
}
