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use async_trait::async_trait;
use opentelemetry::sdk::trace::TraceRuntime;
use std::net::ToSocketAddrs;
#[cfg(any(
    feature = "rt-tokio",
    feature = "rt-tokio-current-thread",
    feature = "rt-async-std"
))]
use std::{
    io,
    net::{Ipv4Addr, Ipv6Addr, SocketAddr},
};

/// Jaeger Trace Runtime is an extension to [`TraceRuntime`].
///
/// [`TraceRuntime`]: opentelemetry::sdk::trace::TraceRuntime
#[async_trait]
pub trait JaegerTraceRuntime: TraceRuntime + std::fmt::Debug {
    /// A communication socket between Jaeger client and agent.
    type Socket: std::fmt::Debug + Send + Sync;

    /// Create a new communication socket.
    fn create_socket<T: ToSocketAddrs>(&self, endpoint: T) -> thrift::Result<Self::Socket>;

    /// Send payload over the socket.
    async fn write_to_socket(&self, socket: &Self::Socket, payload: Vec<u8>) -> thrift::Result<()>;
}

#[cfg(feature = "rt-tokio")]
#[async_trait]
impl JaegerTraceRuntime for opentelemetry::runtime::Tokio {
    type Socket = tokio::net::UdpSocket;

    fn create_socket<T: ToSocketAddrs>(&self, endpoint: T) -> thrift::Result<Self::Socket> {
        let (addrs, family) = addrs_and_family(&endpoint)?;
        let conn = std::net::UdpSocket::bind(family)?;
        conn.connect(addrs.as_slice())?;
        Ok(tokio::net::UdpSocket::from_std(conn)?)
    }

    async fn write_to_socket(&self, socket: &Self::Socket, payload: Vec<u8>) -> thrift::Result<()> {
        socket.send(&payload).await?;

        Ok(())
    }
}

#[cfg(feature = "rt-tokio-current-thread")]
#[async_trait]
impl JaegerTraceRuntime for opentelemetry::runtime::TokioCurrentThread {
    type Socket = tokio::net::UdpSocket;

    fn create_socket<T: ToSocketAddrs>(&self, endpoint: T) -> thrift::Result<Self::Socket> {
        let (addrs, family) = addrs_and_family(&endpoint)?;
        let conn = std::net::UdpSocket::bind(family)?;
        conn.connect(addrs.as_slice())?;
        Ok(tokio::net::UdpSocket::from_std(conn)?)
    }

    async fn write_to_socket(&self, socket: &Self::Socket, payload: Vec<u8>) -> thrift::Result<()> {
        socket.send(&payload).await?;

        Ok(())
    }
}

#[cfg(feature = "rt-async-std")]
#[async_trait]
impl JaegerTraceRuntime for opentelemetry::runtime::AsyncStd {
    type Socket = async_std::net::UdpSocket;

    fn create_socket<T: ToSocketAddrs>(&self, endpoint: T) -> thrift::Result<Self::Socket> {
        let (addrs, family) = addrs_and_family(&endpoint)?;
        let conn = std::net::UdpSocket::bind(family)?;
        conn.connect(addrs.as_slice())?;
        Ok(async_std::net::UdpSocket::from(conn))
    }

    async fn write_to_socket(&self, socket: &Self::Socket, payload: Vec<u8>) -> thrift::Result<()> {
        socket.send(&payload).await?;

        Ok(())
    }
}

/// Sample the first address provided to designate which IP family to bind the socket to.
/// IP families returned be INADDR_ANY as [`Ipv4Addr::UNSPECIFIED`] or
/// IN6ADDR_ANY as [`Ipv6Addr::UNSPECIFIED`].
#[cfg(any(
    feature = "rt-tokio",
    feature = "rt-tokio-current-thread",
    feature = "rt-async-std"
))]
fn addrs_and_family(
    host_port: &impl ToSocketAddrs,
) -> Result<(Vec<SocketAddr>, SocketAddr), io::Error> {
    let addrs = host_port.to_socket_addrs()?.collect::<Vec<_>>();
    let family = match addrs.first() {
        Some(SocketAddr::V4(_)) | None => SocketAddr::from((Ipv4Addr::UNSPECIFIED, 0)),
        Some(SocketAddr::V6(_)) => SocketAddr::from((Ipv6Addr::UNSPECIFIED, 0)),
    };
    Ok((addrs, family))
}