//! Actix connect - tcp connector service
//!
//! ## Package feature
//!
//! * `openssl` - enables ssl support via `openssl` crate
//! * `rustls` - enables ssl support via `rustls` crate
#![deny(rust_2018_idioms, warnings)]
#![allow(clippy::type_complexity)]
#![recursion_limit = "128"]

#[macro_use]
extern crate log;

mod connect;
mod connector;
mod error;
mod resolve;
mod service;
pub mod ssl;

#[cfg(feature = "uri")]
mod uri;

use actix_rt::{net::TcpStream, Arbiter};
use actix_service::{pipeline, pipeline_factory, Service, ServiceFactory};
use trust_dns_resolver::config::{ResolverConfig, ResolverOpts};
use trust_dns_resolver::system_conf::read_system_conf;
use trust_dns_resolver::TokioAsyncResolver as AsyncResolver;

pub mod resolver {
    pub use trust_dns_resolver::config::{ResolverConfig, ResolverOpts};
    pub use trust_dns_resolver::system_conf::read_system_conf;
    pub use trust_dns_resolver::{error::ResolveError, AsyncResolver};
}

pub use self::connect::{Address, Connect, Connection};
pub use self::connector::{TcpConnector, TcpConnectorFactory};
pub use self::error::ConnectError;
pub use self::resolve::{Resolver, ResolverFactory};
pub use self::service::{ConnectService, ConnectServiceFactory, TcpConnectService};

pub async fn start_resolver(
    cfg: ResolverConfig,
    opts: ResolverOpts,
) -> Result<AsyncResolver, ConnectError> {
    Ok(AsyncResolver::tokio(cfg, opts).await?)
}

struct DefaultResolver(AsyncResolver);

pub(crate) async fn get_default_resolver() -> Result<AsyncResolver, ConnectError> {
    if Arbiter::contains_item::<DefaultResolver>() {
        Ok(Arbiter::get_item(|item: &DefaultResolver| item.0.clone()))
    } else {
        let (cfg, opts) = match read_system_conf() {
            Ok((cfg, opts)) => (cfg, opts),
            Err(e) => {
                log::error!("TRust-DNS can not load system config: {}", e);
                (ResolverConfig::default(), ResolverOpts::default())
            }
        };

        let resolver = AsyncResolver::tokio(cfg, opts).await?;

        Arbiter::set_item(DefaultResolver(resolver.clone()));
        Ok(resolver)
    }
}

pub async fn start_default_resolver() -> Result<AsyncResolver, ConnectError> {
    get_default_resolver().await
}

/// Create tcp connector service
pub fn new_connector<T: Address + 'static>(
    resolver: AsyncResolver,
) -> impl Service<Request = Connect<T>, Response = Connection<T, TcpStream>, Error = ConnectError>
       + Clone {
    pipeline(Resolver::new(resolver)).and_then(TcpConnector::new())
}

/// Create tcp connector service
pub fn new_connector_factory<T: Address + 'static>(
    resolver: AsyncResolver,
) -> impl ServiceFactory<
    Config = (),
    Request = Connect<T>,
    Response = Connection<T, TcpStream>,
    Error = ConnectError,
    InitError = (),
> + Clone {
    pipeline_factory(ResolverFactory::new(resolver)).and_then(TcpConnectorFactory::new())
}

/// Create connector service with default parameters
pub fn default_connector<T: Address + 'static>(
) -> impl Service<Request = Connect<T>, Response = Connection<T, TcpStream>, Error = ConnectError>
       + Clone {
    pipeline(Resolver::default()).and_then(TcpConnector::new())
}

/// Create connector service factory with default parameters
pub fn default_connector_factory<T: Address + 'static>() -> impl ServiceFactory<
    Config = (),
    Request = Connect<T>,
    Response = Connection<T, TcpStream>,
    Error = ConnectError,
    InitError = (),
> + Clone {
    pipeline_factory(ResolverFactory::default()).and_then(TcpConnectorFactory::new())
}