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<dyn HttpBody<Data = Bytes, Error = Error> + Send + Unpin>;
pub async fn run_api_server(
garage: Arc<Garage>,
shutdown_signal: impl Future<Output = ()>,
) -> 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<Body>| {
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<Garage>,
req: Request<Body>,
addr: SocketAddr,
) -> Result<Response<BodyType>, 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<Garage>,
req: Request<Body>,
addr: SocketAddr,
) -> Result<Response<BodyType>, 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<Garage>,
mime_type: &str,
bucket: &str,
key: &str,
body: Body,
) -> Result<UUID, Error> {
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<Garage>,
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<Garage>, hash: Hash, data: Vec<u8>) -> 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<u8>,
}
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<Option<Vec<u8>>, 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::<Vec<u8>>();
Ok(Some(block))
} else {
let block = self.buf.drain(..self.block_size).collect::<Vec<u8>>();
Ok(Some(block))
}
}
}
async fn handle_get(
garage: Arc<Garage>,
bucket: &str,
key: &str,
) -> Result<Response<BodyType>, 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::<Vec<_>>();
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<Garage>, hash: &Hash) -> Result<Vec<u8>, 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<Box<dyn Stream<Item = Result<Bytes, Error>> + Send>>,
}
impl HttpBody for NonSyncStreamBody {
type Data = Bytes;
type Error = Error;
fn poll_data(
mut self: Pin<&mut Self>,
cx: &mut Context,
) -> Poll<Option<Result<Bytes, Self::Error>>> {
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<Result<Option<hyper::HeaderMap<hyper::header::HeaderValue>>, Self::Error>> {
Poll::Ready(Ok(None))
}
}
pub struct BytesBody {
pub bytes: Option<Bytes>,
}
impl HttpBody for BytesBody {
type Data = Bytes;
type Error = Error;
fn poll_data(
mut self: Pin<&mut Self>,
_cx: &mut Context,
) -> Poll<Option<Result<Bytes, Self::Error>>> {
Poll::Ready(self.bytes.take().map(Ok))
}
fn poll_trailers(
self: Pin<&mut Self>,
_cx: &mut Context,
) -> Poll<Result<Option<hyper::HeaderMap<hyper::header::HeaderValue>>, Self::Error>> {
Poll::Ready(Ok(None))
}
}
impl From<String> for BytesBody {
fn from(x: String) -> BytesBody {
BytesBody {
bytes: Some(Bytes::from(x.into_bytes())),
}
}
}
impl From<Vec<u8>> for BytesBody {
fn from(x: Vec<u8>) -> BytesBody {
BytesBody {
bytes: Some(Bytes::from(x)),
}
}
}
