grpc 0.9.0-alpha.2

/*
 *
 * Copyright 2025 gRPC authors.
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 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * IN THE SOFTWARE.
 *
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use std::sync::Arc;
use std::time::Duration;
use std::time::Instant;

use crate::client::DynInvoke;
use crate::client::Invoke;
use crate::credentials::client::ClientHandshakeInfo;
use crate::credentials::client::DynClientConnectionSecurityInfo;
use crate::credentials::common::Authority;
use crate::credentials::dyn_wrapper::DynChannelCredentials;
use crate::rt::GrpcRuntime;

mod registry;

// Using tower/buffer enables tokio's rt feature even though it's possible to
// create Buffers with a user provided executor.
#[cfg(feature = "_runtime-tokio")]
pub(crate) mod tonic;

use ::tonic::async_trait;
pub(crate) use registry::GLOBAL_TRANSPORT_REGISTRY;
pub(crate) use registry::TransportRegistry;
use tokio::sync::oneshot;

// TODO: The following options are specific to HTTP/2. We should
// instead pass an `Attribute` like struct to the connect method instead which
// can hold config relevant to a particular transport.
#[derive(Default, Clone)]
pub(crate) struct TransportOptions {
    pub(crate) init_stream_window_size: Option<u32>,
    pub(crate) init_connection_window_size: Option<u32>,
    pub(crate) http2_keep_alive_interval: Option<Duration>,
    pub(crate) http2_keep_alive_timeout: Option<Duration>,
    pub(crate) http2_keep_alive_while_idle: Option<bool>,
    pub(crate) http2_max_header_list_size: Option<u32>,
    pub(crate) http2_adaptive_window: Option<bool>,
    pub(crate) concurrency_limit: Option<usize>,
    pub(crate) rate_limit: Option<(u64, Duration)>,
    pub(crate) tcp_keepalive: Option<Duration>,
    pub(crate) tcp_nodelay: bool,
    pub(crate) connect_deadline: Option<Instant>,
}

#[trait_variant::make(Send)]
pub(crate) trait Transport: Sync {
    type Service: Invoke + 'static;

    async fn connect(
        &self,
        address: String,
        runtime: GrpcRuntime,
        security_opts: &SecurityOpts,
        opts: &TransportOptions,
    ) -> Result<
        (
            Self::Service,
            DynClientConnectionSecurityInfo,
            oneshot::Receiver<Result<(), String>>,
        ),
        String,
    >;
}

#[async_trait]
pub(crate) trait DynTransport: Send + Sync {
    async fn dyn_connect(
        &self,
        address: String,
        runtime: GrpcRuntime,
        security_opts: &SecurityOpts,
        opts: &TransportOptions,
    ) -> Result<
        (
            Box<dyn DynInvoke>,
            DynClientConnectionSecurityInfo,
            oneshot::Receiver<Result<(), String>>,
        ),
        String,
    >;
}

#[async_trait]
impl<T: Transport> DynTransport for T {
    async fn dyn_connect(
        &self,
        address: String,
        runtime: GrpcRuntime,
        security_opts: &SecurityOpts,
        opts: &TransportOptions,
    ) -> Result<
        (
            Box<dyn DynInvoke>,
            DynClientConnectionSecurityInfo,
            oneshot::Receiver<Result<(), String>>,
        ),
        String,
    > {
        let (i, sc, rx) = self.connect(address, runtime, security_opts, opts).await?;
        Ok((Box::new(i), sc, rx))
    }
}

#[derive(Clone)]
pub(crate) struct SecurityOpts {
    pub(crate) credentials: Arc<dyn DynChannelCredentials>,
    pub(crate) authority: Authority,
    pub(crate) handshake_info: ClientHandshakeInfo,
}