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ptth/crates/ptth_kv/src/main.rs

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use std::{
collections::{
HashMap,
},
iter::FromIterator,
sync::{
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Arc,
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},
};
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use hyper::{
Body,
Request,
Response,
StatusCode,
};
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use tokio::{
sync::Mutex,
};
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pub struct HttpService {
store: Arc <Store>,
}
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pub struct Store {
status_dirs: HashMap <Vec <u8>, StatusKeyDirectory>,
}
#[derive (thiserror::Error, Debug, PartialEq)]
pub enum Error {
#[error ("key too long")]
KeyTooLong,
#[error ("no such key dir")]
NoSuchKeyDir,
#[error ("value too long")]
ValueTooLong,
}
pub struct StatusQuotas {
pub max_keys: usize,
pub max_key_bytes: usize,
pub max_value_bytes: usize,
pub max_payload_bytes: usize,
}
pub struct GetAfter {
pub tuples: Vec <(Vec <u8>, Vec <u8>)>,
pub sequence: u64,
}
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impl HttpService {
pub fn new (s: Store) -> Self {
Self {
store: Arc::new (s),
}
}
pub fn inner (&self) -> &Store {
&*self.store
}
pub async fn serve (&self, port: u16) -> Result <(), hyper::Error> {
use std::net::SocketAddr;
use hyper::{
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Server,
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service::{
make_service_fn,
service_fn,
},
};
let make_svc = make_service_fn (|_conn| {
let state = self.store.clone ();
async {
Ok::<_, String> (service_fn (move |req| {
let state = state.clone ();
Self::handle_all (req, state)
}))
}
});
let addr = SocketAddr::from(([127, 0, 0, 1], port));
let server = Server::bind (&addr)
.serve (make_svc)
;
server.await
}
}
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impl Store {
pub fn new <I> (status_dirs: I)
-> Self
where I: Iterator <Item = (Vec <u8>, StatusQuotas)>
{
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let status_dirs = status_dirs
.map (|(name, quotas)| (name, StatusKeyDirectory::new (quotas)))
.collect ();
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Self {
status_dirs,
}
}
pub fn list_key_dirs (&self) -> Vec <Vec <u8>> {
self.status_dirs.iter ()
.map (|(k, _)| k.clone ())
.collect ()
}
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pub async fn set (&self, name: &[u8], key: &[u8], value: Vec <u8>)
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-> Result <(), Error>
{
let dir = self.status_dirs.get (name)
.ok_or (Error::NoSuchKeyDir)?;
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dir.set (key, value).await
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}
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async fn set_multi (&self, name: &[u8], tuples: Vec <(&[u8], Vec <u8>)>)
-> Result <(), Error>
{
let dir = self.status_dirs.get (name)
.ok_or (Error::NoSuchKeyDir)?;
dir.set_multi (tuples).await
}
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pub async fn get_after (&self, name: &[u8], thresh: Option <u64>)
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-> Result <GetAfter, Error>
{
let dir = self.status_dirs.get (name)
.ok_or (Error::NoSuchKeyDir)?;
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dir.get_after (thresh).await
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}
}
// End of public interface
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const SET_BATCH_SIZE: usize = 32;
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enum StoreCommand {
SetStatus (SetStatusCommand),
Multi (Vec <StoreCommand>),
}
struct StatusKeyDirectory {
quotas: StatusQuotas,
// TODO: Make this tokio::sync::Mutex.
table: Mutex <StatusTable>,
}
#[derive (Default)]
struct StatusTable {
map: HashMap <Vec <u8>, StatusValue>,
sequence: u64,
}
struct StatusValue {
value: Vec <u8>,
sequence: u64,
}
struct SetStatusCommand {
key_dir: Vec <u8>,
key: Vec <u8>,
value: Vec <u8>,
}
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impl HttpService {
async fn handle_all (req: Request <Body>, store: Arc <Store>)
-> Result <Response <Body>, anyhow::Error>
{
Ok (Response::builder ()
.body (Body::from ("hello\n"))?)
}
}
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impl StatusKeyDirectory {
fn new (quotas: StatusQuotas) -> Self {
Self {
quotas,
table: Mutex::new (Default::default ()),
}
}
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async fn set (&self, key: &[u8], value: Vec <u8>) -> Result <(), Error>
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{
if key.len () > self.quotas.max_key_bytes {
return Err (Error::KeyTooLong);
}
if value.len () > self.quotas.max_value_bytes {
return Err (Error::ValueTooLong);
}
{
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let mut guard = self.table.lock ().await;
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guard.set (&self.quotas, key, value);
}
Ok (())
}
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async fn set_multi (&self, tuples: Vec <(&[u8], Vec <u8>)>) -> Result <(), Error>
{
{
let mut guard = self.table.lock ().await;
for (key, value) in tuples {
guard.set (&self.quotas, key, value);
}
}
Ok (())
}
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async fn get_after (&self, thresh: Option <u64>) -> Result <GetAfter, Error> {
let guard = self.table.lock ().await;
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Ok (guard.get_after (thresh))
}
}
impl StatusTable {
fn payload_bytes (&self) -> usize {
self.map.iter ()
.map (|(k, v)| k.len () + v.len ())
.sum ()
}
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fn set (&mut self, quotas: &StatusQuotas, key: &[u8], value: Vec <u8>) {
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self.sequence += 1;
if self.map.len () > quotas.max_keys {
self.map.clear ();
}
let new_bytes = key.len () + value.len ();
if self.payload_bytes () + new_bytes > quotas.max_payload_bytes {
self.map.clear ();
}
let value = StatusValue {
value,
sequence: self.sequence,
};
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// self.map.insert (key, value);
match self.map.get_mut (key) {
None => {
self.map.insert (key.to_vec (), value);
},
Some (v) => *v = value,
}
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}
fn get_after (&self, thresh: Option <u64>) -> GetAfter {
let thresh = thresh.unwrap_or (0);
let tuples = self.map.iter ()
.filter_map (|(key, value)| {
if value.sequence <= thresh {
return None;
}
Some ((key.clone (), value.value.clone ()))
})
.collect ();
GetAfter {
tuples,
sequence: self.sequence,
}
}
}
impl StatusValue {
fn len (&self) -> usize {
self.value.len ()
}
}
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#[tokio::main]
async fn main () -> Result <(), hyper::Error> {
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use std::time::Duration;
use tokio::{
spawn,
time::interval,
};
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let service = HttpService::new (Store::new (vec! [
(b"key_dir".to_vec (), StatusQuotas {
max_keys: 4,
max_key_bytes: 16,
max_value_bytes: 16,
max_payload_bytes: 128,
}),
].into_iter ()));
service.serve (4003).await
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}
#[cfg (test)]
mod tests {
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use tokio::runtime::Runtime;
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use super::*;
fn get_after_eq (a: &GetAfter, b: &GetAfter) {
assert_eq! (a.sequence, b.sequence);
let a = a.tuples.clone ();
let b = b.tuples.clone ();
let a = HashMap::<Vec <u8>, Vec <u8>>::from_iter (a.into_iter ());
let b = HashMap::from_iter (b.into_iter ());
assert_eq! (a, b);
}
#[test]
fn store () {
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let rt = Runtime::new ().unwrap ();
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rt.block_on (async {
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let s = Store::new (vec! [
(b"key_dir".to_vec (), StatusQuotas {
max_keys: 4,
max_key_bytes: 16,
max_value_bytes: 16,
max_payload_bytes: 128,
}),
].into_iter ());
let mut expected_sequence = 0;
assert_eq! (s.list_key_dirs (), vec! [
b"key_dir".to_vec (),
]);
assert_eq! (
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s.set (b"key_dir", b"this key is too long and will cause an error", b"bar".to_vec ()).await,
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Err (Error::KeyTooLong)
);
assert_eq! (
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s.set (b"key_dir", b"foo", b"this value is too long and will cause an error".to_vec ()).await,
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Err (Error::ValueTooLong)
);
assert_eq! (
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s.set (b"invalid_key_dir", b"foo", b"bar".to_vec ()).await,
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Err (Error::NoSuchKeyDir)
);
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let ga = s.get_after (b"key_dir", None).await.unwrap ();
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assert_eq! (ga.sequence, expected_sequence);
assert_eq! (ga.tuples, vec! []);
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s.set (b"key_dir", b"foo_1", b"bar_1".to_vec ()).await.unwrap ();
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expected_sequence += 1;
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let ga = s.get_after (b"key_dir", None).await.unwrap ();
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assert_eq! (ga.sequence, expected_sequence);
assert_eq! (ga.tuples, vec! [
(b"foo_1".to_vec (), b"bar_1".to_vec ()),
]);
get_after_eq (&ga, &GetAfter {
sequence: expected_sequence,
tuples: vec! [
(b"foo_1".to_vec (), b"bar_1".to_vec ()),
]
});
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s.set (b"key_dir", b"foo_2", b"bar_2".to_vec ()).await.unwrap ();
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expected_sequence += 1;
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let ga = s.get_after (b"key_dir", None).await.unwrap ();
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get_after_eq (&ga, &GetAfter {
sequence: expected_sequence,
tuples: vec! [
(b"foo_1".to_vec (), b"bar_1".to_vec ()),
(b"foo_2".to_vec (), b"bar_2".to_vec ()),
]
});
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s.set (b"key_dir", b"foo_1", b"bar_3".to_vec ()).await.unwrap ();
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expected_sequence += 1;
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let ga = s.get_after (b"key_dir", None).await.unwrap ();
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get_after_eq (&ga, &GetAfter {
sequence: expected_sequence,
tuples: vec! [
(b"foo_1".to_vec (), b"bar_3".to_vec ()),
(b"foo_2".to_vec (), b"bar_2".to_vec ()),
]
});
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let ga = s.get_after (b"key_dir", Some (2)).await.unwrap ();
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get_after_eq (&ga, &GetAfter {
sequence: expected_sequence,
tuples: vec! [
(b"foo_1".to_vec (), b"bar_3".to_vec ()),
]
});
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let ga = s.get_after (b"key_dir", Some (3)).await.unwrap ();
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get_after_eq (&ga, &GetAfter {
sequence: expected_sequence,
tuples: vec! []
});
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});
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}
:white_check_mark: test: measure performance for KV store idea
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#[test]
#[cfg (not (debug_assertions))]
fn perf () {
use std::time::Instant;
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let rt = Runtime::new ().unwrap ();
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rt.block_on (async {
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let s = Store::new (vec! [
(b"key_dir".to_vec (), StatusQuotas {
max_keys: 4,
max_key_bytes: 16,
max_value_bytes: 16,
max_payload_bytes: 128,
}),
].into_iter ());
let num_iters = 1_000_000;
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let key = b"foo";
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let start_time = Instant::now ();
for i in 0..num_iters {
let value = format! ("{}", i);
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s.set (b"key_dir", key, value.into ()).await.unwrap ();
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}
let end_time = Instant::now ();
let total_dur = end_time - start_time;
let avg_nanos = total_dur.as_nanos () / num_iters;
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assert! (avg_nanos < 250, dbg! (avg_nanos));
});
}
#[test]
#[cfg (not (debug_assertions))]
fn perf_multi () {
use std::time::Instant;
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let rt = Runtime::new ().unwrap ();
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rt.block_on (async {
let s = Store::new (vec! [
(b"key_dir".to_vec (), StatusQuotas {
max_keys: 8,
max_key_bytes: 16,
max_value_bytes: 16,
max_payload_bytes: 128,
}),
].into_iter ());
let num_iters = 1_000_000;
let start_time = Instant::now ();
for i in 0..num_iters {
let value = Vec::<u8>::from (format! ("{}", i));
let tuples = vec! [
(&b"foo_0"[..], value.clone ()),
(b"foo_1", value.clone ()),
(b"foo_2", value.clone ()),
(b"foo_3", value.clone ()),
(b"foo_4", value.clone ()),
(b"foo_5", value.clone ()),
(b"foo_6", value.clone ()),
(b"foo_7", value.clone ()),
];
s.set_multi (b"key_dir", tuples).await.unwrap ();
}
let end_time = Instant::now ();
let total_dur = end_time - start_time;
let avg_nanos = total_dur.as_nanos () / (num_iters * 8);
assert! (avg_nanos < 150, dbg! (avg_nanos));
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});
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}
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}