Passes fault-tolerant multi-node broadcast.

This commit is contained in:
Joe Ardent 2024-05-20 14:01:05 -07:00
parent 417f01d484
commit 28e6e76008
6 changed files with 71 additions and 736 deletions

652
Cargo.lock generated
View file

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View file

@ -8,7 +8,4 @@ authors = ["joe ardent"]
license-file = "LICENSE.md"
[workspace.dependencies]
async-trait = "0.1"
maelstrom-node = "0.1"
tokio = { version = "1", default-features = false, features = ["io-util", "io-std", "rt-multi-thread", "macros"] }
serde_json = "1"

View file

@ -6,7 +6,5 @@ authors.workspace = true
license-file.workspace = true
[dependencies]
async-trait.workspace = true
maelstrom-node.workspace = true
serde_json.workspace = true
tokio.workspace = true
nebkor-maelstrom = { path = "../nebkor-maelstrom" }

View file

@ -1,23 +1,21 @@
use async_trait::async_trait;
use maelstrom::protocol::Message;
use maelstrom::{done, protocol::MessageBody, Node, Result, Runtime};
use serde_json::{Map, Value};
use std::borrow::BorrowMut;
use std::collections::HashMap;
use std::sync::{Arc, Mutex};
use std::{collections::HashMap, rc::Rc, sync::Mutex};
#[tokio::main]
async fn main() {
let handler = Arc::new(BCaster::default());
let _ = Runtime::new()
.with_handler(handler)
.run()
.await
.unwrap_or_default();
use nebkor_maelstrom::{protocol::Payload, Body, Message, Node, Runner};
fn main() {
let out = std::io::stdout().lock();
let input = std::io::stdin().lock();
let node = BCaster::default();
let node = Rc::new(Mutex::new(node));
let runner = Runner::new(out, node);
runner.run(input);
}
type Store = Arc<Mutex<HashMap<String, i64>>>;
type Gossips = Arc<Mutex<HashMap<(u64, String), MessageBody>>>;
type Store = HashMap<String, i64>;
type Gossips = HashMap<u64, Message>;
#[derive(Clone, Default)]
struct BCaster {
@ -25,105 +23,83 @@ struct BCaster {
pub gossips: Gossips,
}
static GOSSIP: &str = "gossip";
#[async_trait]
impl Node for BCaster {
async fn process(&self, runtime: Runtime, req: Message) -> Result<()> {
let typ = req.get_type();
fn handle(&mut self, runner: &Runner, req: &Message) {
let typ = req.body.typ.as_str();
let frm = req.src.as_str();
let mid = req.body.msg_id;
let nid = runtime.node_id();
let key = format!("{frm}{mid}");
let nid = runner.node_id();
let nid = nid.as_str();
let key = format!("{frm}-{mid}");
let key = key.as_str();
{
let gossips: Vec<((_, String), MessageBody)> = {
let g = self.gossips.lock().unwrap();
g.clone().into_iter().collect()
};
for ((_, node), gossip) in gossips.into_iter() {
runtime.send(node, gossip).await.unwrap_or_default();
for (_, gossip) in self.gossips.iter() {
runner.send(gossip.clone());
}
}
match typ {
// "g_ok" => {
// let id = req.body.in_reply_to;
// let key = (id, frm.to_owned());
// eprintln!("{nid} got gossip_ok for msg {id} from {frm}");
// {
// let mut g = self.gossips.lock().unwrap();
// if g.remove(&key).is_some() {
// eprintln!("{} removed message {id}", runtime.node_id());
// }
// }
// }
"gossip_ok" => {
let id = req.body.in_reply_to;
self.gossips.remove(&id);
}
"broadcast" => {
let val = req.body.extra.get("message").and_then(|v| v.as_i64());
let val = req.body.payload.get("message").and_then(|v| v.as_i64());
if let Some(val) = val {
{
// there's only one thread, safe to unwrap
let mut guard = self.store.lock().unwrap();
guard.borrow_mut().entry(key.to_owned()).or_insert(val);
self.store.entry(key.to_owned()).or_insert(val);
}
let extra: Map<String, Value> = [
let extra: Payload = [
("key".to_string(), key.into()),
("val".to_string(), val.into()),
]
.into_iter()
.collect();
let gossip = MessageBody::from_extra(extra).with_type(GOSSIP);
for node in runtime.neighbours() {
let id = runtime.next_msg_id();
let gossip = gossip.clone().and_msg_id(id);
{
let mut g = self.gossips.lock().unwrap();
g.insert((id, node.to_owned()), gossip.clone());
}
runtime.rpc(node, gossip).await.unwrap_or_default();
}
let gossip = Body::from_type("gossip").with_payload(extra);
for node in runner.nodes().iter().filter(|n| n.as_str() != nid) {
let id = runner.next_msg_id();
let gossip = gossip.clone().with_msg_id(id);
let msg = Message {
body: gossip,
src: nid.to_string(),
dest: node.to_string(),
};
self.gossips.insert(id, msg.clone());
let body = MessageBody::new().with_type("broadcast_ok");
return runtime.reply(req, body).await;
runner.send(msg);
}
let body = Body::from_type("broadcast_ok");
runner.reply(req, body);
}
}
"read" => {
eprintln!("{req:?}");
let vals = {
let g = self.store.lock().unwrap();
g.values().cloned().collect::<Vec<_>>()
};
let body = MessageBody::from_extra(
[("messages".to_string(), vals.into())]
.into_iter()
.collect(),
)
.with_type("read_ok");
return runtime.reply(req, body).await;
let vals = self.store.values().cloned().collect::<Vec<_>>();
let payload: Payload = [("messages".to_string(), vals.into())]
.into_iter()
.collect();
let body = Body::from_type("read_ok").with_payload(payload);
runner.reply(req, body);
}
"topology" => {
let body = MessageBody::new().with_type("topology_ok");
return runtime.reply(req, body).await;
let body = Body::from_type("topology_ok");
runner.reply(req, body);
}
"gossip" => {
let key = req.body.extra.get("key").unwrap().as_str().unwrap();
let val = req.body.extra.get("val").unwrap().as_i64().unwrap();
{
// there's only one thread, safe to unwrap
let mut guard = self.store.lock().unwrap();
guard.entry(key.to_string()).or_insert(val);
}
let body = MessageBody::new().with_type("g_ok");
return runtime.reply(req, body).await;
let key = req.body.payload.get("key").unwrap().as_str().unwrap();
let val = req.body.payload.get("val").unwrap().as_i64().unwrap();
self.store.entry(key.to_string()).or_insert(val);
let body = Body::from_type("gossip_ok");
runner.reply(req, body);
}
_ => {
eprintln!("unknown type: {req:?}");
}
}
done(runtime, req)
}
}

View file

@ -63,6 +63,10 @@ impl<'io> Runner<'io> {
self.msg_id.fetch_add(1, Ordering::SeqCst)
}
pub fn nodes(&self) -> &[String] {
self.nodes.get().unwrap()
}
pub fn init(&self, msg: &Message) {
let node_id = msg
.body

View file

@ -4,7 +4,7 @@ use serde_repr::{Deserialize_repr, Serialize_repr};
pub type Payload = Map<String, Value>;
#[derive(Debug, Clone, Serialize, Deserialize)]
#[derive(Debug, Default, Clone, Serialize, Deserialize)]
pub struct Message {
pub src: String,
pub dest: String,