├── .gitignore
├── README.md
├── Cargo.toml
├── src
    └── main.rs
└── Cargo.lock


/.gitignore:
--------------------------------------------------------------------------------
1 | /target
2 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # Simple Paxos Implementation
 2 | 
 3 | ## How to run it
 4 | 
 5 | Run the following commands in different terminals:
 6 | 
 7 | ```bash
 8 | cargo run -- --id 0
 9 | cargo run -- --id 1
10 | cargo run -- --id 2
11 | ```
12 | 
13 | Send a propose to any of the nodes:
14 | 
15 | ```bash
16 | curl -X POST http://0.0.0.0:8000/ -d "proposed value"
17 | ```
18 | 
19 | ## References
20 | 
21 | - https://lamport.azurewebsites.net/pubs/paxos-simple.pdf
22 | - https://people.cs.rutgers.edu/~pxk/417/notes/paxos.html
23 | 


--------------------------------------------------------------------------------
/Cargo.toml:
--------------------------------------------------------------------------------
 1 | [package]
 2 | name = "paxos"
 3 | version = "0.1.0"
 4 | edition = "2021"
 5 | 
 6 | # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 7 | 
 8 | [dependencies]
 9 | anyhow = "1.0.68"
10 | axum = "0.6.4"
11 | axum-macros = "0.3.2"
12 | clap = { version = "4.1.4", features = ["derive"] }
13 | futures = "0.3.26"
14 | hyper = { version = "0.14.24", features = ["full"] }
15 | reqwest = { version = "0.11.14", features = ["json"] }
16 | serde = { version = "1.0.152", features = ["derive"] }
17 | serde_json = "1.0.91"
18 | tokio = { version = "1.25.0", features = ["full"] }
19 | tower = "0.4.13"
20 | 


--------------------------------------------------------------------------------
/src/main.rs:
--------------------------------------------------------------------------------
  1 | use std::sync::Arc;
  2 | use std::net::SocketAddr;
  3 | use anyhow::{Result, anyhow};
  4 | use axum::{routing::post, Json, Extension};
  5 | use axum_macros::debug_handler;
  6 | use clap::Parser;
  7 | use tokio::sync::Mutex;
  8 | 
  9 | #[derive(Parser, Debug)]
 10 | struct Args {
 11 |     #[arg(long)]
 12 |     id: u64
 13 | }
 14 | 
 15 | #[tokio::main]
 16 | async fn main() {
 17 |     let args = Args::parse();
 18 | 
 19 |     let nodes = [
 20 |         "0.0.0.0:8000",
 21 |         "0.0.0.0:8001",
 22 |         "0.0.0.0:8002"
 23 |     ];
 24 | 
 25 |     let current_addr = nodes[args.id as usize];
 26 | 
 27 |     let nodes: Vec<(u64, &'static str)> = nodes.into_iter()
 28 |         .enumerate()
 29 |         .filter(|(id, _)| *id as u64 != args.id)
 30 |         .map(|(id, addr)| (id as u64, addr))
 31 |         .collect();
 32 | 
 33 |     let config = Config::new(args.id, nodes);
 34 | 
 35 |     let paxos = Paxos::new(config);
 36 | 
 37 |     let router = axum::Router::new()
 38 |         .route("/", post(client_propose))
 39 |         .route("/acceptor/handle-prepare-message", post(handle_prepare_message))
 40 |         .route("/acceptor/handle-propose", post(handle_propose))
 41 |         .layer(Extension(Arc::new(Mutex::new(paxos))));
 42 | 
 43 |     println!("listening on {current_addr}");
 44 | 
 45 |     axum::Server::bind(&current_addr.parse().unwrap())
 46 |         .serve(router.into_make_service())
 47 |         .await
 48 |         .unwrap();
 49 | }
 50 | 
 51 | #[debug_handler]
 52 | async fn client_propose(Extension(paxos): Extension<Arc<Mutex<Paxos>>>, value: String) -> Result<String, String> {
 53 |     println!("Received propose with value<{value}>");
 54 | 
 55 |     let mut paxos = paxos.lock().await;
 56 | 
 57 |     paxos.proposer
 58 |         .prepare(value.clone()).await
 59 |         .map_err(|err| err.to_string())?;
 60 | 
 61 |     Ok(format!("Accepted {value}"))
 62 | }
 63 | 
 64 | #[debug_handler]
 65 | async fn handle_prepare_message(Extension(paxos): Extension<Arc<Mutex<Paxos>>>, prepare_id: String) -> Result<Json<Promise>, String> {
 66 |     let mut paxos = paxos.lock().await;
 67 |  
 68 |     match paxos.acceptor.handle_prepare(prepare_id.parse::<u64>().map_err(|err| err.to_string())?) {
 69 |         Ok(promise) => Ok(Json(promise)),
 70 |         Err(err) => Err(err.to_string())
 71 |     }
 72 | }
 73 | 
 74 | async fn handle_propose(Extension(paxos): Extension<Arc<Mutex<Paxos>>>, Json(propose): Json<Propose>) -> Result<Json<Value>, String> {
 75 |     let mut paxos = paxos.lock().await;
 76 | 
 77 |     match paxos.acceptor.handle_propose(propose) {
 78 |         Ok(value) => Ok(Json(value)),
 79 |         Err(err) => Err(err.to_string())
 80 |     }
 81 | }
 82 | 
 83 | 
 84 | #[derive(Clone, Debug)]
 85 | pub struct Node {
 86 |     pub id: u64,
 87 |     pub addr: SocketAddr
 88 | }
 89 | 
 90 | impl Node {
 91 |     fn new(id: u64, addr: SocketAddr) -> Self {
 92 |         Self { id, addr }
 93 |     }
 94 | 
 95 |     fn endpoint(&self, path: &str) -> String {
 96 |         format!("http://{}/{}", self.addr, path.trim_start_matches('/'))
 97 |     }
 98 | }
 99 | 
100 | #[derive(Clone, Debug)]
101 | pub struct Config {
102 |     pub id: u64,
103 |     pub nodes: Vec<Node>
104 | }
105 | 
106 | impl Config {
107 |     fn new(id: u64, addresses: Vec<(u64, &'static str)>) -> Self {
108 |         let mut nodes = Vec::new();
109 | 
110 |         for (id, addr) in addresses {
111 |             nodes.push(Node::new(id, addr.parse().unwrap()));
112 |         }
113 | 
114 |         Self { id, nodes }
115 |     }
116 | }
117 | 
118 | struct Paxos {
119 |     pub proposer: Proposer,
120 |     pub acceptor: Acceptor,
121 | }
122 | 
123 | impl Paxos {
124 |     fn new(config: Config) -> Self {
125 |         Self { 
126 |             proposer: Proposer::new(config), 
127 |             acceptor: Acceptor::default()
128 |         }
129 |     }
130 | }
131 | 
132 | pub struct Proposer {
133 |     pub id: u64,
134 |     pub config: Config,
135 |     pub promises: Vec<Promise>
136 | }
137 | 
138 | impl Proposer {
139 |     pub fn new(config: Config) -> Self {
140 |         Self {
141 |             id: 0,
142 |             config, 
143 |             promises: Vec::new(),
144 |         }
145 |     }
146 | }
147 | 
148 | impl Proposer {
149 |     pub async fn prepare(&mut self, value: String) -> anyhow::Result<()> {
150 |         self.id += 1;
151 | 
152 |         let client = reqwest::Client::new();
153 | 
154 |         let reqs = self.config.nodes.iter().map(|node| {
155 |             client.post(node.endpoint("/acceptor/handle-prepare-message"))
156 |                 .json(&self.id)
157 |                 .send()
158 |         });
159 | 
160 |         let result = futures::future::join_all(reqs).await;
161 | 
162 |         let mut promises = Vec::with_capacity(result.len());
163 | 
164 |         for result in result.into_iter().flatten() {
165 |             promises.push(result.json::<Promise>().await?)
166 |         }            
167 |         
168 |         let majority = (self.config.nodes.len() / 2) + 1;
169 | 
170 |         if promises.len() + 1 < majority {
171 |             return Err(anyhow!("didn't received promise from majority of acceptors"));
172 |         }
173 | 
174 |         let accepted_promise = promises.into_iter()
175 |             .filter(|Promise(value)| value.value.is_some())
176 |             .max_by_key(|Promise(value)| value.id);
177 | 
178 |         let has_accepted_value = accepted_promise.is_some();                
179 | 
180 |         let value = match accepted_promise {
181 |             Some(value) => value.0.value.unwrap(),
182 |             None => value
183 |         };
184 | 
185 |         let propose = Propose(Value { id: self.id, value: Some(value) });
186 | 
187 |         let requests = self.config.nodes.iter().map(|node| {
188 |             client.post(node.endpoint("/acceptor/handle-propose"))
189 |                 .json(&propose)
190 |                 .send()
191 |         });
192 | 
193 |         let responses = futures::future::join_all(requests).await;
194 | 
195 |         let mut accepted_values = Vec::with_capacity(responses.len());
196 | 
197 |         for result in responses.into_iter().flatten() {
198 |             accepted_values.push(result.json::<Value>().await?);
199 |         }
200 | 
201 |         if accepted_values.len() + 1 < majority {
202 |             return Err(anyhow!("value not accepted by majority"));
203 |         }
204 | 
205 |         if has_accepted_value {
206 |             return Err(anyhow!("already accepted another value"));
207 |         }
208 | 
209 |         Ok(())
210 |     }
211 | }
212 | 
213 | #[derive(Clone, serde::Deserialize, serde::Serialize)]
214 | pub struct Propose(pub Value);
215 | 
216 | #[derive(Default)]
217 | pub struct Acceptor {
218 |     max_id: u64,
219 |     accepted_propose: Option<Propose>,
220 | }
221 | 
222 | impl Acceptor {
223 |     pub fn handle_prepare(&mut self, prepare_id: u64) -> Result<Promise> {
224 |         if prepare_id < self.max_id {
225 |             return Err(anyhow!("already accepted a propose with a higher id"));
226 |         }
227 | 
228 |         self.max_id = prepare_id;
229 | 
230 |         if self.accepted_propose.is_some() {
231 |             let value = self.accepted_propose.clone().unwrap().0.value;
232 | 
233 |             return Ok(Promise(Value { id: prepare_id, value }));
234 |         }
235 | 
236 |         Ok(Promise(Value { id: prepare_id, value: None }))
237 |     }
238 | 
239 | 
240 |     pub fn handle_propose(&mut self, propose: Propose) -> Result<Value> {
241 |         if self.max_id != propose.0.id {
242 |             return Err(anyhow!("cannot accept propose with lower id"));
243 |         }
244 | 
245 |         self.accepted_propose = Some(propose.clone());
246 | 
247 |         Ok(propose.0)
248 |     }
249 | }
250 | 
251 | #[derive(serde::Serialize, serde::Deserialize)]
252 | pub struct Promise(pub Value);
253 | 
254 | #[derive(Clone, serde::Deserialize, serde::Serialize)]
255 | pub struct Value {
256 |     pub id: u64,
257 |     pub value: Option<String>,
258 | }
259 | 


--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------