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file diff --git a/jaeseung-blockchain/src/block/block.rs b/jaeseung-blockchain/src/block/block.rs new file mode 100644 index 0000000..b703cba --- /dev/null +++ b/jaeseung-blockchain/src/block/block.rs @@ -0,0 +1,192 @@ +use std::time::{SystemTime, UNIX_EPOCH}; + +use sha256::digest; + +use rs_merkle::{algorithms::Sha256, Hasher, MerkleTree}; + +use to_binary::BinaryString; + +use crate::constants::{ + BLOCK_GENERATION_INTERVAL_MINUTE, BLOCK_GENERATION_MILLIS, DIFFICULTY_ADJUSTMENT_INTERVAL_COUNT, +}; + +#[derive(Debug, PartialEq, Clone)] // TODO : Copy 와 Clone 의 차이점? +pub struct Block { + header: BlockHeader, + data: Vec, +} + +impl Block { + const GENESIS_DATA: &str = "This is GENESIS block"; + + pub fn new_genesis() -> Result { + let data = vec![Self::GENESIS_DATA.to_string()]; + + Ok(Block { + header: BlockHeader::make( + 0, + Self::unsafe_get_timestamp(), + &["0"; 64].join(""), + 0, + &data, + )?, + data: data, + }) + } + + pub fn new( + previous_block: &Block, + data: &Vec, + adjustment_block: &Block, + ) -> Result { + let p_header = &previous_block.header; + + let new_height = p_header.height + 1; + let new_timestamp = Self::unsafe_get_timestamp(); + + let difficulty = + Self::get_difficulty(new_height, new_timestamp, previous_block, adjustment_block); + + Ok(Block { + header: BlockHeader::make( + p_header.height + 1, + new_timestamp, + &p_header.hash, + difficulty, + data, + )?, + data: data.clone(), // TODO : clone 이 맞을까? + }) + } + + fn get_difficulty( + new_height: i32, + new_timestamp: u64, + previous_block: &Block, + adjustment_block: &Block, + ) -> i32 { + match new_height { + 0..=9 => 0, + 10..=19 => 1, + h if h % DIFFICULTY_ADJUSTMENT_INTERVAL_COUNT as i32 != 0 => { + previous_block.header.difficulty + } + _ => { + let time_taken = new_timestamp - adjustment_block.header.timestamp; + let time_expected = u64::from( + DIFFICULTY_ADJUSTMENT_INTERVAL_COUNT + * BLOCK_GENERATION_INTERVAL_MINUTE + * BLOCK_GENERATION_MILLIS, + ); + + if time_taken < time_expected / 2 { + adjustment_block.header.difficulty + 1 + } else if time_taken > time_expected * 2 { + adjustment_block.header.difficulty - 1 + } else { + adjustment_block.header.difficulty + } + } + } + } + + fn unsafe_get_timestamp() -> u64 { + SystemTime::now() + .duration_since(UNIX_EPOCH) + .unwrap() + .as_secs() + } +} + +#[derive(Debug, PartialEq, Clone)] +struct BlockHeader { + version: String, + height: i32, // 블록의 높이. 블록 체인에 연결된 블록의 수 + timestamp: u64, + hash: String, // 생성일시, 버전, bits, 머클루트, previousHash, nonce 의 조합을 해싱한 값 + previous_hash: Option, // 이전 블록의 해싱 값 + merkle_root: String, // https://brunch.co.kr/@gapcha/263 + nonce: i32, + difficulty: i32, +} + +impl BlockHeader { + const VERSION: &str = "1.0.0"; + + fn make( + height: i32, + timestamp: u64, + previous_hash: &String, + difficulty: i32, + data: &Vec, + ) -> Result { + let prefix_zero = "0".repeat(difficulty as usize); + + let merkle_root = Self::make_merkle_root(data).ok_or("Merkle Tree Parsing Failed")?; + + let mut nonce = 0; + + // TODO : closure 와 꼬리 재귀를 써서 할 순 없을까? + let (nonce, hash) = loop { + nonce += 1; + + let hash = Self::make_block_hash( + height, + timestamp, + &merkle_root, + previous_hash, + nonce, + difficulty, + ); + + let binary = BinaryString::from_hex(&hash) + .map_err(|_| "hex to binary failed".to_string())? + .to_string(); + + if binary.as_str().starts_with(prefix_zero.as_str()) { + break (nonce, hash); + } + }; + + Ok(BlockHeader { + version: Self::VERSION.to_string(), + height, + timestamp, + hash, + previous_hash: Some(previous_hash.clone()), + merkle_root, + nonce, + difficulty, + }) + } + + // TODO : data 가 빈 배열일 때 오류남. + fn make_merkle_root(data: &Vec) -> Option { + let mut merkle_tree: MerkleTree = MerkleTree::new(); + let mut leaves: Vec<[u8; 32]> = data.iter().map(|x| Sha256::hash(x.as_bytes())).collect(); + merkle_tree.append(&mut leaves).commit(); + + merkle_tree.root_hex() + } + + fn make_block_hash( + height: i32, + timestamp: u64, + merkle_root: &String, + previous_hash: &String, + nonce: i32, + difficulty: i32, + ) -> String { + let target = format!( + "{}{}{}{}{}{}{}", + Self::VERSION.to_string(), + height.to_string(), + timestamp.to_string(), + merkle_root, + previous_hash, + nonce.to_string(), + difficulty.to_string() + ); + digest(target) + } +} diff --git a/jaeseung-blockchain/src/block/mod.rs b/jaeseung-blockchain/src/block/mod.rs new file mode 100644 index 0000000..215fd92 --- /dev/null +++ b/jaeseung-blockchain/src/block/mod.rs @@ -0,0 +1,2 @@ +pub mod block; +pub use block::*; diff --git a/jaeseung-blockchain/src/chain/chain.rs b/jaeseung-blockchain/src/chain/chain.rs new file mode 100644 index 0000000..aed187c --- /dev/null +++ b/jaeseung-blockchain/src/chain/chain.rs @@ -0,0 +1,96 @@ +use crate::{block::Block, constants::DIFFICULTY_ADJUSTMENT_INTERVAL_COUNT}; + +#[derive(Debug)] +pub struct Chain { + block_chain: Vec, +} + +impl Chain { + pub fn new() -> Result { + Block::new_genesis().map(|b| Chain { + block_chain: vec![b], + }) + } + + pub fn get_length(&self) -> u32 { + self.block_chain.len() as u32 + } + + pub fn get_lastest_block(&self) -> Option<&Block> { + self.block_chain.last() + } + + pub fn add_block(&mut self, data: &Vec) -> Result<&Chain, String> { + let previous_block = self + .get_lastest_block() + .ok_or("previous_block not exist.")?; + let adjustment_block = self.get_adjustment_block()?; + + let new_block = Block::new(previous_block, data, &adjustment_block)?; + + self.block_chain.push(new_block); // TODO : 안전할까? + Ok(self) + } + + fn get_adjustment_block(&self) -> Result { + let current_length = self.get_length(); + + match current_length { + ..DIFFICULTY_ADJUSTMENT_INTERVAL_COUNT => Block::new_genesis(), + _ => Ok(self.block_chain + [(current_length - DIFFICULTY_ADJUSTMENT_INTERVAL_COUNT) as usize] + .clone()), + } + } +} + +#[cfg(test)] +mod tests { + + use super::*; + + #[test] + fn create_chain() { + let chain = Chain::new().unwrap(); + + assert_eq!(chain.block_chain.len(), 1); + } + + #[test] + fn get_length() { + let chain = Chain::new().unwrap(); + + assert_eq!(chain.get_length(), 1); + } + + #[test] + fn get_lastest_block() { + let first_block = Block::new_genesis().unwrap(); + let second_block = Block::new(&first_block, 0, &vec!["data".to_string()]).unwrap(); + + let chain = Chain { + block_chain: vec![first_block, second_block.clone()], + }; + + assert_eq!(*chain.get_lastest_block().unwrap(), second_block); + } + + #[test] + fn add_block_to_empty_chain() { + let mut empty_chain = Chain { + block_chain: Vec::new(), + }; + let result = empty_chain.add_block(&vec!["data".to_string()]); + + assert_eq!(result.is_err(), true); + assert_eq!(empty_chain.block_chain.len(), 0); + } + + #[test] + fn add_block() { + let mut chain = Chain::new().unwrap(); + let added_chain = chain.add_block(&vec!["data".to_string()]).unwrap(); + + assert_eq!(added_chain.block_chain.len(), 2); + } +} diff --git a/jaeseung-blockchain/src/chain/mod.rs b/jaeseung-blockchain/src/chain/mod.rs new file mode 100644 index 0000000..0b86d70 --- /dev/null +++ b/jaeseung-blockchain/src/chain/mod.rs @@ -0,0 +1,2 @@ +pub mod chain; +pub use chain::*; diff --git a/jaeseung-blockchain/src/constants.rs b/jaeseung-blockchain/src/constants.rs new file mode 100644 index 0000000..fa07b18 --- /dev/null +++ b/jaeseung-blockchain/src/constants.rs @@ -0,0 +1,11 @@ +// 블록 1 묶음의 블록 개수 +pub const DIFFICULTY_ADJUSTMENT_INTERVAL_COUNT: u32 = 10; + +// 블록 1 묶음이 생성 되기까지의 예상 시간(분) +pub const BLOCK_GENERATION_INTERVAL_MINUTE: u32 = 10; + +// 블록 1 개가 생성 되기까지의 예상 시간(밀리초) +pub const BLOCK_GENERATION_MILLIS: u32 = 60000; + +pub const HTTP_PORT: u16 = 80; +pub const SOCKET_PORT: u16 = 3000; diff --git a/jaeseung-blockchain/src/main.rs b/jaeseung-blockchain/src/main.rs new file mode 100644 index 0000000..eed13dc --- /dev/null +++ b/jaeseung-blockchain/src/main.rs @@ -0,0 +1,89 @@ +mod block; +mod chain; +mod constants; +mod server; + +use std::{ + convert::Infallible, + net::{SocketAddr, TcpListener, TcpStream}, + result, +}; + +use block::Block; +use chain::Chain; +use constants::{HTTP_PORT, SOCKET_PORT}; +use futures::{SinkExt, StreamExt}; +use hyper::{Body, Response, Server}; +use routerify::{Router, RouterService}; +use routerify_websocket::{upgrade_ws, Message, WebSocket}; +use server::{HttpServer, P2PServer}; + +// fn main() -> std::io::Result<()> { +// let mut chain = Chain::new().unwrap(); + +// let listener = TcpListener::bind("127.0.0.1:80")?; + +// for stream in listener.incoming() { +// handle_client(stream?); +// } + +// Ok(()) + +// // for x in 1..10 { +// // chain.add_block(&vec![format!("data-{x}").to_string()]); +// // } + +// // print!("{:#?}", chain); +// } + +async fn ws_handler(ws: WebSocket) { + println!("New websocket connection: {}", ws.remote_addr()); + connect_socket(ws); +} + +async fn connect_socket(ws: WebSocket) { + // 참조를 sockets 에 저 + + // The `WebSocket` implements the `Sink` and `Stream` traits + // to read and write messages. + let (mut tx, mut rx) = ws.split(); + + // Read messages. + while let Some(msg) = rx.next().await { + let msg = msg.unwrap(); + + // Check message type and take appropriate actions. + if msg.is_text() { + println!("{}", msg.into_text().unwrap()); + } else if msg.is_binary() { + println!("{:?}", msg.into_bytes()); + } + + // Send a text message. + let send_msg = Message::text("msg from server"); + tx.send(send_msg).await.unwrap(); + } +} + +// tokio : async 런타임 라이브러리 +#[tokio::main] +async fn main() { + tokio::spawn(async move { + match hyper::upgrade::on(req).await { + Ok(upgraded) => { + ws_handler(WebSocket::from_raw_socket(upgraded, remote_addr, config).await).await; + } + Err(err) => log::error!("{}", crate::WebsocketError::Upgrade(err.into())), + } + }); + + let http_server = HttpServer::new(); + let p2p_server = P2PServer::new(); + + let ((), ()) = futures::join!( + http_server.listen(HTTP_PORT), + p2p_server.listen(SOCKET_PORT) + ); + + println!("{:#?}", P2PServer::sockets); +} diff --git a/jaeseung-blockchain/src/server/http_server.rs b/jaeseung-blockchain/src/server/http_server.rs new file mode 100644 index 0000000..ad9c921 --- /dev/null +++ b/jaeseung-blockchain/src/server/http_server.rs @@ -0,0 +1,33 @@ +use std::{convert::Infallible, net::SocketAddr}; + +use futures::{SinkExt, StreamExt}; +use hyper::{Body, Response, Server}; +use routerify::{Router, RouterService}; +use routerify_websocket::{upgrade_ws, Message, WebSocket}; + +pub struct HttpServer {} + +impl HttpServer { + pub fn new() -> HttpServer { + HttpServer {} + } + + pub async fn listen(&self, port: u16) { + let router: Router = Router::builder() + .get("/", |_req| async move { + Ok(Response::new("I also serve http requests".into())) + }) + .build() + .unwrap(); + + let service = RouterService::new(router).unwrap(); + + let addr = SocketAddr::from(([127, 0, 0, 1], port)); + + let server = Server::bind(&addr).serve(service); + + if let Err(err) = server.await { + eprintln!("Http Server error: {}", err); + } + } +} diff --git a/jaeseung-blockchain/src/server/mod.rs b/jaeseung-blockchain/src/server/mod.rs new file mode 100644 index 0000000..3b41e78 --- /dev/null +++ b/jaeseung-blockchain/src/server/mod.rs @@ -0,0 +1,4 @@ +pub mod http_server; +pub mod p2p_server; +pub use http_server::*; +pub use p2p_server::*; diff --git a/jaeseung-blockchain/src/server/p2p_server.rs b/jaeseung-blockchain/src/server/p2p_server.rs new file mode 100644 index 0000000..145f507 --- /dev/null +++ b/jaeseung-blockchain/src/server/p2p_server.rs @@ -0,0 +1,71 @@ +use std::{convert::Infallible, net::SocketAddr, sync::OnceLock}; + +use futures::{SinkExt, StreamExt}; +use hyper::{upgrade, Body, Request, Response, Server}; +use routerify::{Router, RouterService}; +use routerify_websocket::{upgrade_ws, upgrade_ws_with_config, Message, WebSocket}; + +pub struct P2PServer {} + +impl P2PServer { + pub const sockets: Vec<&WebSocket> = vec![]; + + // P2PServer 는 하나의 인스턴스만 존재한다. + pub fn new() -> &'static P2PServer { + static INSTANCE: OnceLock = OnceLock::new(); + INSTANCE.get_or_init(|| P2PServer {}) + } + + pub async fn listen(&'static self, port: u16) { + let router: Router = Router::builder() + .any_method("/", upgrade_ws(|ws| self.connect_socket(ws))) + // upgrade_ws 의 handler 는 static 한 무언가를 받는 것 같다. + .post("/addToPeer", move |req| async move { + let response = self.connect_to_peer(req); + Ok(response) + }) + .build() + .unwrap(); + + let service = RouterService::new(router).unwrap(); + + let addr = SocketAddr::from(([127, 0, 0, 1], port)); + + let server = Server::bind(&addr).serve(service); + + if let Err(err) = server.await { + eprintln!("Socket Server error: {}", err); + } + } + + fn connect_to_peer(&'static self, req: Request) -> Response { + return Response::new("I also serve http requests".into()); + } + + async fn connect_socket(&'static self, ws: WebSocket) { + println!("New websocket connection: {}", ws.remote_addr()); + + // 참조를 sockets 에 저장. + Self::sockets.push(&ws); + + // The `WebSocket` implements the `Sink` and `Stream` traits + // to read and write messages. + let (mut tx, mut rx) = ws.split(); + + // Read messages. + while let Some(msg) = rx.next().await { + let msg = msg.unwrap(); + + // Check message type and take appropriate actions. + if msg.is_text() { + println!("{}", msg.into_text().unwrap()); + } else if msg.is_binary() { + println!("{:?}", msg.into_bytes()); + } + + // Send a text message. + let send_msg = Message::text("msg from server"); + tx.send(send_msg).await.unwrap(); + } + } +} diff --git a/jaeseung/src/dependency.rs b/jaeseung/src/dependency.rs index 5242e58..16b79eb 100644 --- a/jaeseung/src/dependency.rs +++ b/jaeseung/src/dependency.rs @@ -1,3 +1,3 @@ use crate::user::{repo, UserDbRepository}; -pub static USER_REPO: repo::UserDbRepository = UserDbRepository {}; \ No newline at end of file +pub static USER_REPO: repo::UserDbRepository = UserDbRepository {}; diff --git a/jaeseung/src/domain/login.rs b/jaeseung/src/domain/login.rs index 03f5b10..c6f2825 100644 --- a/jaeseung/src/domain/login.rs +++ b/jaeseung/src/domain/login.rs @@ -1,7 +1,7 @@ -use std::ops::Deref; +use crate::dependency::USER_REPO; use crate::user::UserRepository; use crate::utils::get_input; -use crate::dependency::USER_REPO; +use std::ops::Deref; pub fn login() -> Result<(), String> { let id = get_input("ID 를 입력해 주세요"); @@ -11,6 +11,6 @@ pub fn login() -> Result<(), String> { match user_opt { Some(user) if user.password.eq(password.deref()) => Ok(()), - _ => Err("id, password 를 다시 확인해 주세요.".to_string()) + _ => Err("id, password 를 다시 확인해 주세요.".to_string()), } -} \ No newline at end of file +} diff --git a/jaeseung/src/domain/mod.rs b/jaeseung/src/domain/mod.rs index 3673407..92ae353 100644 --- a/jaeseung/src/domain/mod.rs +++ b/jaeseung/src/domain/mod.rs @@ -1,4 +1,4 @@ pub mod login; pub use login::*; pub mod sign; -pub use sign::*; \ No newline at end of file +pub use sign::*; diff --git a/jaeseung/src/domain/sign.rs b/jaeseung/src/domain/sign.rs index 1e7cab1..5268979 100644 --- a/jaeseung/src/domain/sign.rs +++ b/jaeseung/src/domain/sign.rs @@ -1,5 +1,5 @@ -use crate::get_input; use crate::dependency::USER_REPO; +use crate::get_input; use crate::user::{User, UserRepository}; pub fn sign_in() -> Result<(), String> { @@ -14,10 +14,13 @@ pub fn sign_in() -> Result<(), String> { let password_check = get_input("비밀번호를 다시 입력해 주세요"); if password == password_check { - USER_REPO.save_user(User { id: id.to_string(), password: password.to_string() }) + USER_REPO.save_user(User { + id: id.to_string(), + password: password.to_string(), + }) } else { Err("비밀번호가 다릅니다. 처음부터 다시 시도해 주세요.".to_string()) } } } -} \ No newline at end of file +} diff --git a/jaeseung/src/main.rs b/jaeseung/src/main.rs index 2655180..ecaf654 100644 --- a/jaeseung/src/main.rs +++ b/jaeseung/src/main.rs @@ -1,11 +1,11 @@ -mod domain; -mod utils; mod dependency; +mod domain; mod user; +mod utils; -use std::ops::Deref; -use utils::*; use domain::*; +use std::{collections::HashMap, ops::Deref}; +use utils::*; fn main() { loop { @@ -29,4 +29,4 @@ fn main() { } } } -} \ No newline at end of file +} diff --git a/jaeseung/src/user/mod.rs b/jaeseung/src/user/mod.rs index 29fe760..6824944 100644 --- a/jaeseung/src/user/mod.rs +++ b/jaeseung/src/user/mod.rs @@ -1,4 +1,4 @@ pub mod user; pub use user::*; pub mod repo; -pub use repo::*; \ No newline at end of file +pub use repo::*; diff --git a/jaeseung/src/user/repo/db.rs b/jaeseung/src/user/repo/db.rs index 32c195d..37a8311 100644 --- a/jaeseung/src/user/repo/db.rs +++ b/jaeseung/src/user/repo/db.rs @@ -8,40 +8,51 @@ const DB_USER_NAME: &'static str = "root"; const DB_PASSWORD: &'static str = "1234"; const DB_IP: &'static str = "localhost"; const DB_PORT: u16 = 3306_u16; -const DB_NAME:&'static str = "my_schema"; +const DB_NAME: &'static str = "my_schema"; pub struct UserDbRepository; impl UserRepository for UserDbRepository { - fn find_user_by_id(&self, id: &Box) -> Result, String> { // TODO : 커넥션 static 하게 - let db_url = format!("mysql://{}:{}@{}:{}/{}", DB_USER_NAME, DB_PASSWORD, DB_IP, DB_PORT, DB_NAME); + let db_url = format!( + "mysql://{}:{}@{}:{}/{}", + DB_USER_NAME, DB_PASSWORD, DB_IP, DB_PORT, DB_NAME + ); let pool = mysql::Pool::new(db_url).expect("연결 실패!"); let query = "select * from user where id=:id"; - let results = pool.prep_exec(query, mysql::params! { "id" => id.as_str() }).expect("쿼리 실패"); + let results = pool + .prep_exec(query, mysql::params! { "id" => id.as_str() }) + .expect("쿼리 실패"); let row = results.last().map(|row| row.unwrap()); match row { Some(row) => { let (id, password): (String, String) = mysql::from_row(row); - Ok(Some(User {id, password})) - }, - None => Ok(None) + Ok(Some(User { id, password })) + } + None => Ok(None), } } fn save_user(&self, user: User) -> Result<(), String> { - let db_url = format!("mysql://{}:{}@{}:{}/{}", DB_USER_NAME, DB_PASSWORD, DB_IP, DB_PORT, DB_NAME); + let db_url = format!( + "mysql://{}:{}@{}:{}/{}", + DB_USER_NAME, DB_PASSWORD, DB_IP, DB_PORT, DB_NAME + ); let pool = mysql::Pool::new(db_url).expect("연결 실패!"); let query = "insert into user (id, password) values (:id, :password)"; - pool.prep_exec(query, mysql::params! { "id" => user.id.as_str(), "password" => user.password.as_str() }).expect("쿼리 실패"); + pool.prep_exec( + query, + mysql::params! { "id" => user.id.as_str(), "password" => user.password.as_str() }, + ) + .expect("쿼리 실패"); Ok(()) } -} \ No newline at end of file +} diff --git a/jaeseung/src/user/repo/file.rs b/jaeseung/src/user/repo/file.rs index 5327e02..f073eb7 100644 --- a/jaeseung/src/user/repo/file.rs +++ b/jaeseung/src/user/repo/file.rs @@ -13,18 +13,24 @@ impl UserRepository for UserFileRepository { let mut file = OpenOptions::new().read(true).open("src/users.csv").unwrap(); let mut contents = String::new(); - file.read_to_string(&mut contents).expect("read file Error 발생!"); + file.read_to_string(&mut contents) + .expect("read file Error 발생!"); // TODO : 함수형으로 작성 for content in contents.split("\n") { let row = content.split(",").collect::>(); - if row.len() < 2 { break; } + if row.len() < 2 { + break; + } let exist_id = row.get(0).unwrap(); let password = row.get(1).unwrap(); if id.deref() == exist_id { - return Ok(Some(User { id: exist_id.to_string(), password: password.to_string()})); + return Ok(Some(User { + id: exist_id.to_string(), + password: password.to_string(), + })); } } @@ -32,10 +38,15 @@ impl UserRepository for UserFileRepository { } fn save_user(&self, user: User) -> Result<(), String> { - let mut file = OpenOptions::new().write(true).append(true).open("src/users.csv").unwrap(); + let mut file = OpenOptions::new() + .write(true) + .append(true) + .open("src/users.csv") + .unwrap(); let content = format!("{},{}\n", user.id, user.password); - - file.write(content.as_bytes()).expect("write file Error 발생!"); + + file.write(content.as_bytes()) + .expect("write file Error 발생!"); Ok(()) } -} \ No newline at end of file +} diff --git a/jaeseung/src/user/repo/interface.rs b/jaeseung/src/user/repo/interface.rs index 1f7b533..255f18d 100644 --- a/jaeseung/src/user/repo/interface.rs +++ b/jaeseung/src/user/repo/interface.rs @@ -3,4 +3,4 @@ use crate::user::User; pub trait UserRepository { fn find_user_by_id(&self, id: &Box) -> Result, String>; fn save_user(&self, user: User) -> Result<(), String>; -} \ No newline at end of file +} diff --git a/jaeseung/src/user/user.rs b/jaeseung/src/user/user.rs index 6aa1f58..73dd7b5 100644 --- a/jaeseung/src/user/user.rs +++ b/jaeseung/src/user/user.rs @@ -1,4 +1,4 @@ pub struct User { pub id: String, - pub password: String -} \ No newline at end of file + pub password: String, +} diff --git a/jaeseung/src/utils/mod.rs b/jaeseung/src/utils/mod.rs index 426222f..eadd0c8 100644 --- a/jaeseung/src/utils/mod.rs +++ b/jaeseung/src/utils/mod.rs @@ -1,2 +1,2 @@ pub mod print_util; -pub use print_util::*; \ No newline at end of file +pub use print_util::*; diff --git a/jaeseung/src/utils/print_util.rs b/jaeseung/src/utils/print_util.rs index 62ff04c..403d76e 100644 --- a/jaeseung/src/utils/print_util.rs +++ b/jaeseung/src/utils/print_util.rs @@ -14,6 +14,8 @@ pub fn get_input(order: &str) -> Box { io::stdout().flush().expect("Flush 실패!"); let mut input = String::new(); - io::stdin().read_line(&mut input).expect("read_line Error 발생!"); + io::stdin() + .read_line(&mut input) + .expect("read_line Error 발생!"); Box::from(input.trim().to_string()) -} \ No newline at end of file +}