use std::str::FromStr; #[derive(PartialEq, Debug)]pub enum Protocol {    V1,    V2,} impl FromStr for Protocol {    type Err = String;     fn from_str(s: &str) -> Result<Self, Self::Err> {        Ok(match s {            "1" => Protocol::V1,            "2" => Protocol::V2,            _ => return Err(format!("Unsupported protocol version '{}', choose '1' or '2'", s)),        })    }} #[cfg(any(feature = "blocking-client", feature = "async-client"))]mod impls {    use git_repository::protocol::transport;     use super::Protocol;     impl From<Protocol> for transport::Protocol {        fn from(v: Protocol) -> Self {            match v {                Protocol::V1 => transport::Protocol::V1,                Protocol::V2 => transport::Protocol::V2,            }        }    }} impl Default for Protocol {    fn default() -> Self {        // Note that it's very important this remains V2, as V1 may block forver in stateful (i.e. non-http) connections when fetching        // as we chose not to complicate matters by counting which arguments where sent (just yet).        Protocol::V2    }}#[cfg(feature = "async-client")]mod async_io {    use std::{io, time::Duration};     use async_net::TcpStream;    use futures_lite::FutureExt;    use git_repository::{        objs::bstr::BString,        protocol::{            transport,            transport::{                client,                client::{connect::Error, git},            },        },    };     async fn git_connect(        host: &str,        path: BString,        desired_version: transport::Protocol,        port: Option<u16>,    ) -> Result<git::Connection<TcpStream, TcpStream>, Error> {        let read = TcpStream::connect(&(host, port.unwrap_or(9418)))            .or(async {                async_io::Timer::after(Duration::from_secs(5)).await;                Err(io::ErrorKind::TimedOut.into())            })            .await            .map_err(|e| Box::new(e) as Box<dyn std::error::Error + Send + Sync>)?;        let write = read.clone();        Ok(git::Connection::new(            read,            write,            desired_version,            path,            None::<(String, _)>,            git::ConnectMode::Daemon,        ))    }     pub async fn connect(        url: &[u8],        desired_version: transport::Protocol,    ) -> Result<impl client::Transport + Send, Error> {        let urlb = url;        let url = git_repository::url::parse(urlb)?;        Ok(match url.scheme {            git_repository::url::Scheme::Git => {                if url.user.is_some() {                    return Err(Error::UnsupportedUrlTokens(urlb.into(), url.scheme));                }                git_connect(                    url.host.as_ref().expect("host is present in url"),                    url.path,                    desired_version,                    url.port,                )                .await?            }            scheme => return Err(Error::UnsupportedScheme(scheme)),        })    }}#[cfg(feature = "blocking-client")]pub use git_repository::protocol::transport::connect; #[cfg(feature = "async-client")]pub use self::async_io::connect;