use async_std::net::{SocketAddr, ToSocketAddrs, UdpSocket};
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use std::error::Error;
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use byteorder::{BigEndian, ByteOrder};
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use rand::Rng;
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use sha1::{Sha1, Digest};
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extern crate serde;
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extern crate serde_bencode;
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#[macro_use]
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extern crate serde_derive;
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extern crate serde_bytes;
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use serde_bencode::{de, ser};
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use serde_bytes::ByteBuf;
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#[derive(Debug, Deserialize)]
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struct Node(String, i64);
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#[derive(Debug, Serialize, Deserialize)]
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struct File {
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path: Vec<String>,
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length: i64,
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#[serde(default)]
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md5sum: Option<String>,
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}
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#[derive(Debug, Serialize, Deserialize)]
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struct Info {
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name: String,
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pieces: ByteBuf,
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#[serde(rename = "piece length")]
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piece_length: i64,
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#[serde(default)]
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md5sum: Option<String>,
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#[serde(default)]
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length: Option<i64>,
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#[serde(default)]
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files: Option<Vec<File>>,
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#[serde(default)]
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private: Option<u8>,
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#[serde(default)]
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path: Option<Vec<String>>,
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#[serde(default)]
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#[serde(rename = "root hash")]
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root_hash: Option<String>,
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}
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#[derive(Debug, Deserialize)]
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struct Torrent {
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info: Info,
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#[serde(default)]
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announce: Option<String>,
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#[serde(default)]
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nodes: Option<Vec<Node>>,
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#[serde(default)]
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encoding: Option<String>,
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#[serde(default)]
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httpseeds: Option<Vec<String>>,
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#[serde(default)]
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#[serde(rename = "announce-list")]
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announce_list: Option<Vec<Vec<String>>>,
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#[serde(default)]
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#[serde(rename = "creation date")]
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creation_date: Option<i64>,
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#[serde(rename = "comment")]
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comment: Option<String>,
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#[serde(default)]
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#[serde(rename = "created by")]
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created_by: Option<String>,
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}
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impl Torrent {
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pub fn open(path: &str) -> Torrent {
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let b = std::fs::read(path).unwrap();
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de::from_bytes::<Torrent>(&b).unwrap()
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}
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pub fn size(&self) -> u64 {
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let files = self.info.files.as_ref().unwrap();
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let mut size: u64 = 0;
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for i in 0..files.len() {
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size = size + files[i].length as u64;
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}
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size
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}
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pub fn info_hash(&self) -> Vec<u8> {
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let info_bytes: Vec<u8> = ser::to_bytes(&self.info).unwrap();
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let mut hasher = Sha1::new();
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hasher.update(info_bytes);
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let result = hasher.finalize();
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result.to_vec()
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}
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pub fn protocol(&self) -> Option<&str> {
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match &self.announce {
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Some(s) => {
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let aux: Vec<&str> = s.split(":").collect();
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Some(aux[0])
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}
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_ => None,
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}
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}
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// pub fn peer(&self) -> Option<&str> {
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// match &self.announce {
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// Some(s) => {
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// let aux: Vec<&str> = s.split(":").collect();
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// Some(aux[1])
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// }
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// _ => None,
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// }
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// }
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pub async fn get_peers(&self) -> Result<(), Box<dyn Error>> {
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if self.protocol().unwrap() != "udp" {
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panic!("not udp: {:?}", self.protocol().unwrap());
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}
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let peer = self.announce.clone().unwrap().replace("udp://", "");
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println!("peer {:?}", peer);
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let socket = UdpSocket::bind("0.0.0.0:6681").await?;
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let conn_req = conn_req_msg().to_vec();
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println!("SENDING conn_req {:?}", conn_req);
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socket.send_to(&conn_req, &peer).await?;
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// let mut res: Vec<u8>;
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let mut buf = vec![0; 1024];
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let peers = loop {
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let (n, src) = socket.recv_from(&mut buf).await?;
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let typ = resp_type(&buf);
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println!("res {:?}", &buf[0..n]);
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println!("t {:?}", typ);
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// match typ {
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if typ == CONNECT_MSG {
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println!("TYPE: CONNECT: {:?}", CONNECT_MSG);
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let conn_resp = parse_connect_resp(&buf);
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println!("conn_resp {:?}", conn_resp);
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let announce_req = ann_req_msg(conn_resp.connection_id, self, 6681);
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println!("announce_req {:?}", announce_req);
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socket.send_to(&announce_req[..], &src).await?;
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} else if typ==ANNOUNCE_MSG {
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println!("TYPE: ANNOUNCE: {:?}", ANNOUNCE_MSG);
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let ann_resp = parse_announce_resp(&buf);
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println!("PEERS1 {:?}", ann_resp.peers);
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break ann_resp.peers;
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}
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println!("End");
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};
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println!("PEERS2 {:?}", peers);
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Ok(())
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}
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}
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fn conn_req_msg() -> [u8; 16] {
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let mut b: [u8; 16] = [0; 16];
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BigEndian::write_u64(&mut b[0..8], 0x41727101980); // connection_id
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let random_bytes = rand::thread_rng().gen::<[u8; 4]>();
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b[12..16].clone_from_slice(&random_bytes[..]);
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b
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}
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fn ann_req_msg(connection_id: u64, torrent: &Torrent, port: u16) -> Vec<u8> {
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let mut b: [u8; 98] = [0; 98];
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BigEndian::write_u64(&mut b[0..8], connection_id);
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BigEndian::write_u32(&mut b[8..12], CONNECT_MSG); // action
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let random_bytes = rand::thread_rng().gen::<[u8; 4]>();
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b[12..16].clone_from_slice(&random_bytes[..]);
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// println!("md5sum {:?}", torrent);
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b[16..36].clone_from_slice(&torrent.info_hash()[..]);
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println!("info_hash: {:?}", &b[16..36]);
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// TODO [36..56] peerId b[36..56].clone_from_slice("todo".as_bytes());
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// TODO [56..64] downloaded
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println!("torrent.size(): {:?}", torrent.size());
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BigEndian::write_u64(&mut b[64..72], torrent.size()); // [64..72] left
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// TODO [72..80] uploaded
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// TODO [80..84] event (0:none, 1:completed, 2:started, 3:stopped)
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// TODO [84..88] ip address
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let random_bytes = rand::thread_rng().gen::<[u8; 4]>();
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b[88..92].clone_from_slice(&random_bytes[..]); // [88..92] key (random)
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BigEndian::write_i32(&mut b[92..96], -1); // [92..96] num_want (default: -1)
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BigEndian::write_u16(&mut b[96..98], port); // [96..98] port
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b.to_vec()
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}
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const CONNECT_MSG: u32 = 0;
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const ANNOUNCE_MSG: u32 = 1;
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fn resp_type(b: &Vec<u8>) -> u32 {
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let action = BigEndian::read_u32(&b[0..4]);
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if action == 0 {
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return CONNECT_MSG;
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} else {
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return ANNOUNCE_MSG;
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}
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}
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#[derive(Debug)]
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struct ConnResp {
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action: u32,
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transaction_id: u32,
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connection_id: u64,
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}
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fn parse_connect_resp(b: &Vec<u8>) -> ConnResp {
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ConnResp {
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action: BigEndian::read_u32(&b[0..4]),
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transaction_id: BigEndian::read_u32(&b[4..8]),
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connection_id: BigEndian::read_u64(&b[8..]),
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}
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}
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#[derive(Debug)]
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struct Peer {
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ip: u32,
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port: u32
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}
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#[derive(Debug)]
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struct AnnResp {
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action: u32,
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transaction_id: u32,
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interval: u32,
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leechers: u32,
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seeders: u32,
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peers: Vec<Peer>,
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}
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fn parse_announce_resp(b: &Vec<u8>) -> AnnResp {
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let mut peers: Vec<Peer> = Vec::new();
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let n_peers = (b.len()-20)/6;
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for i in 0..n_peers {
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let peer: Peer = Peer {
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ip: BigEndian::read_u32(&b[20+(6*i)..24+(6*i)]),
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port: BigEndian::read_u32(&b[24+(6*i)..26+(6*i)]),
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};
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peers.push(peer);
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}
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let ann_resp: AnnResp = AnnResp {
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action: BigEndian::read_u32(&b[0..4]),
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transaction_id: BigEndian::read_u32(&b[4..8]),
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interval: BigEndian::read_u32(&b[8..12]),
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leechers: BigEndian::read_u32(&b[12..16]),
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seeders: BigEndian::read_u32(&b[16..20]),
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peers: peers
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};
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ann_resp
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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// #[test]
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#[async_std::test]
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async fn test_read() {
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let t = Torrent::open("test.torrent");
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// println!("{:?}", t);
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println!("torrent: {:?}", t.info.name);
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println!("announce: {:?}", t.announce.clone().unwrap());
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println!("protocol: {:?}", t.protocol().unwrap());
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println!("conn_req_msg: {:?}", conn_req_msg());
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let r = t.get_peers().await;
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println!("get_peers r: {:?}", r);
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}
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}
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