aboutsummaryrefslogtreecommitdiff
path: root/src/api_server.rs
blob: ff7c536ca84284467b5291ff4ad8a382b54a09eb (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
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::data::*;
use crate::proto::*;
use crate::rpc_client::*;
use crate::server::Garage;

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<Body>, Error> {
	match handler_inner(garage, 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(garage: Arc<Garage>, 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(garage, &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(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 version = VersionMeta{
		bucket: bucket.into(),
		key: key.into(),
		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,
	};

	if first_block.len() < INLINE_THRESHOLD {
		version.data = VersionData::Inline(first_block);
		version.is_complete = true;
		garage.version_table.insert(&version).await?;
		return Ok(version_uuid)
	}

	let first_block_hash = hash(&first_block[..]);
	version.data = VersionData::FirstBlock(first_block_hash);
	garage.version_table.insert(&version).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(garage.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(garage.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;
	garage.version_table.insert(&version).await?;
	Ok(version_uuid)
}

async fn put_block(garage: Arc<Garage>, meta: BlockMeta, data: Vec<u8>) -> Result<(), Error> {
	let who = garage.system.members.read().await
		.walk_ring(&meta.hash, garage.system.config.meta_replication_factor);
	rpc_try_call_many(garage.system.clone(),
					  &who[..],
					  &Message::PutBlock(PutBlockMessage{
						  meta,
						  data,
						}),
					  (garage.system.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))
		}
	}
}