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use bytes::Bytes;
use futures_util::StreamExt;
use std::{
collections::{HashMap, VecDeque},
net::SocketAddr,
str,
sync::{Arc, Mutex},
};
use tokio::sync::mpsc;
use tonic::{transport::Server, Request, Response, Status};
use crate::{
dstore_proto::{
dstore_server::{Dstore, DstoreServer},
Byte, KeyValue, Null, Size,
},
MAX_BYTE_SIZE,
};
pub struct Global {
db: Arc<Mutex<HashMap<Bytes, Bytes>>>,
cluster: Arc<Mutex<HashMap<Bytes, Arc<Mutex<VecDeque<Bytes>>>>>>,
}
impl Global {
fn new() -> Self {
Self {
db: Arc::new(Mutex::new(HashMap::new())),
cluster: Arc::new(Mutex::new(HashMap::new())),
}
}
pub async fn start_server(addr: SocketAddr) -> Result<(), Box<dyn std::error::Error>> {
Server::builder()
.add_service(DstoreServer::new(Self::new()))
.serve(addr)
.await?;
Ok(())
}
}
#[tonic::async_trait]
impl Dstore for Global {
async fn join(&self, args: Request<Byte>) -> Result<Response<Null>, Status> {
self.cluster.lock().unwrap().insert(
Bytes::from(args.into_inner().body),
Arc::new(Mutex::new(VecDeque::new())),
);
Ok(Response::new(Null {}))
}
async fn contains(&self, args: Request<Byte>) -> Result<Response<Size>, Status> {
match self.db.lock().unwrap().get(&args.into_inner().body[..]) {
Some(value) => Ok(Response::new(Size {
size: value.len() as i32,
})),
None => Err(Status::not_found("Value doesn't exist")),
}
}
async fn push(&self, args: Request<KeyValue>) -> Result<Response<Null>, Status> {
let mut db = self.db.lock().unwrap();
let args = args.into_inner();
match db.contains_key(&args.key[..]) {
true => Err(Status::already_exists(format!(
"{} already in use.",
str::from_utf8(&args.key).unwrap()
))),
false => {
db.insert(Bytes::from(args.key), Bytes::from(args.value));
Ok(Response::new(Null {}))
}
}
}
async fn push_file(
&self,
args: Request<tonic::Streaming<Byte>>,
) -> Result<Response<Null>, Status> {
let mut stream = args.into_inner();
let mut i = 0;
let (mut key, mut buf) = (vec![], vec![]);
while let Some(byte) = stream.next().await {
let byte = byte?;
if i == 0 {
key.append(&mut byte.body.clone());
} else {
buf.append(&mut byte.body.clone());
}
i += 1;
}
self.db
.lock()
.unwrap()
.insert(Bytes::from(key), Bytes::from(buf));
Ok(Response::new(Null {}))
}
async fn pull(&self, args: Request<Byte>) -> Result<Response<Byte>, Status> {
let db = self.db.lock().unwrap();
let args = args.into_inner();
match db.get(&args.body[..]) {
Some(val) => Ok(Response::new(Byte { body: val.to_vec() })),
None => Err(Status::not_found(format!(
"{} mapping doesn't exist.",
str::from_utf8(&args.body).unwrap()
))),
}
}
type PullFileStream = mpsc::Receiver<Result<Byte, Status>>;
async fn pull_file(
&self,
args: Request<Byte>,
) -> Result<Response<Self::PullFileStream>, Status> {
let (mut tx, rx) = mpsc::channel(4);
let db = self.db.clone();
tokio::spawn(async move {
let val = db
.lock()
.unwrap()
.get(&args.into_inner().body[..])
.unwrap()
.to_vec();
for i in 0..val.len() / MAX_BYTE_SIZE {
tx.send(Ok(Byte {
body: val[i * MAX_BYTE_SIZE..(i + 1) * MAX_BYTE_SIZE].to_vec(),
}))
.await
.unwrap();
}
});
Ok(Response::new(rx))
}
async fn remove(&self, args: Request<Byte>) -> Result<Response<Null>, Status> {
let key = args.into_inner().body;
for addr in self.cluster.lock().unwrap().values() {
addr.lock().unwrap().push_back(Bytes::from(key.clone()));
}
match self.db.lock().unwrap().remove(&key[..]) {
Some(_) => Ok(Response::new(Null {})),
None => Err(Status::not_found(format!(
"Couldn't remove {}",
str::from_utf8(&key).unwrap()
))),
}
}
async fn update(&self, args: Request<Byte>) -> Result<Response<Byte>, Status> {
let args = args.into_inner().body;
match self
.cluster
.lock()
.unwrap()
.get(&args[..])
.unwrap()
.lock()
.unwrap()
.pop_front()
{
Some(keys) => Ok(Response::new(Byte {
body: keys.to_vec(),
})),
None => Err(Status::not_found("")),
}
}
}