lib.rs

#![warn(rust_2018_idioms, warnings)]
#![allow(
    clippy::type_complexity,
    clippy::borrow_interior_mutable_const,
    clippy::needless_doctest_main
)]

//! `awc` is a HTTP/WebSocket Client library implemented atop of `actix` stack.
//!
//! ## Making a GET request
//!
//! ```rust
//! # use actix_rt::System;
//! #[actix_rt::main]
//! # async fn main() -> Result<(), awc::error::SendRequestError> {
//! let mut client = awc::Client::default();
//! let response = client.get("http://www.rust-lang.org") // <- Create request builder
//!     .header("User-Agent", "Actix-web")
//!     .send()                                           // <- Send http request
//!     .await?;
//!
//!  println!("Response: {:?}", response);
//! # Ok(())
//! # }
//! ```
//!
//! ## Making POST requests
//!
//! ### Raw body contents
//!
//! ```rust
//! # use actix_rt::System;
//! # #[actix_rt::main]
//! # async fn main() -> Result<(), awc::error::SendRequestError> {
//! let mut client = awc::Client::default();
//! let response = client.post("http://httpbin.org/post")
//!     .send_body("Raw body contents")
//!     .await?;
//! # Ok(())
//! # }
//! ```
//!
//! ### Forms
//!
//! ```rust
//! # use actix_rt::System;
//! # #[actix_rt::main]
//! # async fn main() -> Result<(), awc::error::SendRequestError> {
//! let params = [("foo", "bar"), ("baz", "quux")];
//!
//! let mut client = awc::Client::default();
//! let response = client.post("http://httpbin.org/post")
//!     .send_form(&params)
//!     .await?;
//! # Ok(())
//! # }
//! ```
//!
//! ### JSON
//!
//! ```rust
//! # use std::collections::HashMap;
//! # use actix_rt::System;
//! # #[actix_rt::main]
//! # async fn main() -> Result<(), awc::error::SendRequestError> {
//! let mut map = HashMap::new();
//! map.insert("lang", "rust");
//! map.insert("body", "json");
//!
//! let mut client = awc::Client::default();
//! let response = client.post("http://httpbin.org/post")
//!     .send_json(&map)
//!     .await?;
//! # Ok(())
//! # }
//! ```
//!
//! ## WebSocket support
//!
//! ```
//! # use awc::{Client, ws};
//! # #[actix_rt::main]
//! # async fn main() -> Result<(), Box<dyn std::error::Error>> {
//! use futures_util::{sink::SinkExt, stream::StreamExt};
//! let (_resp, mut connection) = Client::new()
//!     .ws("ws://echo.websocket.org")
//!     .connect()
//!     .await?;
//!
//! connection
//!     .send(ws::Message::Text("Echo".to_string()))
//!     .await?;
//! let response = connection.next().await.unwrap()?;
//! # assert_eq!(response, ws::Frame::Text("Echo".as_bytes().into()));
//! # Ok(())
//! # }
//! ```

use std::cell::RefCell;
use std::convert::TryFrom;
use std::rc::Rc;
use std::time::Duration;

pub use actix_http::{client::Connector, cookie, http};

use actix_http::http::{Error as HttpError, HeaderMap, Method, Uri};
use actix_http::RequestHead;

mod builder;
mod connect;
pub mod error;
mod frozen;
mod request;
mod response;
mod sender;
pub mod test;
pub mod ws;

pub use self::builder::ClientBuilder;
pub use self::connect::BoxedSocket;
pub use self::frozen::{FrozenClientRequest, FrozenSendBuilder};
pub use self::request::ClientRequest;
pub use self::response::{ClientResponse, JsonBody, MessageBody};
pub use self::sender::SendClientRequest;

use self::connect::{Connect, ConnectorWrapper};

/// An asynchronous web Client.
///
/// ## Examples
///
/// ```rust
/// use awc::Client;
///
/// #[actix_rt::main]
/// async fn main() {
///     let mut client = Client::default();
///
///     let res = client.get("http://www.rust-lang.org") // <- Create request builder
///         .header("User-Agent", "Actix-web")
///         .send()                             // <- Send http request
///         .await;                             // <- send request and wait for response
///
///      println!("Response: {:?}", res);
/// }
/// ```
#[derive(Clone)]
pub struct Client(Rc<ClientConfig>);

pub(crate) struct ClientConfig {
    pub(crate) connector: RefCell<Box<dyn Connect>>,
    pub(crate) headers: HeaderMap,
    pub(crate) timeout: Option<Duration>,
}

impl Default for Client {
    fn default() -> Self {
        Client(Rc::new(ClientConfig {
            connector: RefCell::new(Box::new(ConnectorWrapper(
                Connector::new().finish(),
            ))),
            headers: HeaderMap::new(),
            timeout: Some(Duration::from_secs(5)),
        }))
    }
}

impl Client {
    /// Create new client instance with default settings.
    pub fn new() -> Client {
        Client::default()
    }

    /// Build client instance.
    pub fn build() -> ClientBuilder {
        ClientBuilder::new()
    }

    /// Construct HTTP request.
    pub fn request<U>(&self, method: Method, url: U) -> ClientRequest
    where
        Uri: TryFrom<U>,
        <Uri as TryFrom<U>>::Error: Into<HttpError>,
    {
        let mut req = ClientRequest::new(method, url, self.0.clone());

        for (key, value) in self.0.headers.iter() {
            req = req.set_header_if_none(key.clone(), value.clone());
        }
        req
    }

    /// Create `ClientRequest` from `RequestHead`
    ///
    /// It is useful for proxy requests. This implementation
    /// copies all headers and the method.
    pub fn request_from<U>(&self, url: U, head: &RequestHead) -> ClientRequest
    where
        Uri: TryFrom<U>,
        <Uri as TryFrom<U>>::Error: Into<HttpError>,
    {
        let mut req = self.request(head.method.clone(), url);
        for (key, value) in head.headers.iter() {
            req = req.set_header_if_none(key.clone(), value.clone());
        }
        req
    }

    /// Construct HTTP *GET* request.
    pub fn get<U>(&self, url: U) -> ClientRequest
    where
        Uri: TryFrom<U>,
        <Uri as TryFrom<U>>::Error: Into<HttpError>,
    {
        self.request(Method::GET, url)
    }

    /// Construct HTTP *HEAD* request.
    pub fn head<U>(&self, url: U) -> ClientRequest
    where
        Uri: TryFrom<U>,
        <Uri as TryFrom<U>>::Error: Into<HttpError>,
    {
        self.request(Method::HEAD, url)
    }

    /// Construct HTTP *PUT* request.
    pub fn put<U>(&self, url: U) -> ClientRequest
    where
        Uri: TryFrom<U>,
        <Uri as TryFrom<U>>::Error: Into<HttpError>,
    {
        self.request(Method::PUT, url)
    }

    /// Construct HTTP *POST* request.
    pub fn post<U>(&self, url: U) -> ClientRequest
    where
        Uri: TryFrom<U>,
        <Uri as TryFrom<U>>::Error: Into<HttpError>,
    {
        self.request(Method::POST, url)
    }

    /// Construct HTTP *PATCH* request.
    pub fn patch<U>(&self, url: U) -> ClientRequest
    where
        Uri: TryFrom<U>,
        <Uri as TryFrom<U>>::Error: Into<HttpError>,
    {
        self.request(Method::PATCH, url)
    }

    /// Construct HTTP *DELETE* request.
    pub fn delete<U>(&self, url: U) -> ClientRequest
    where
        Uri: TryFrom<U>,
        <Uri as TryFrom<U>>::Error: Into<HttpError>,
    {
        self.request(Method::DELETE, url)
    }

    /// Construct HTTP *OPTIONS* request.
    pub fn options<U>(&self, url: U) -> ClientRequest
    where
        Uri: TryFrom<U>,
        <Uri as TryFrom<U>>::Error: Into<HttpError>,
    {
        self.request(Method::OPTIONS, url)
    }

    /// Initialize a WebSocket connection.
    /// Returns a WebSocket connection builder.
    pub fn ws<U>(&self, url: U) -> ws::WebsocketsRequest
    where
        Uri: TryFrom<U>,
        <Uri as TryFrom<U>>::Error: Into<HttpError>,
    {
        let mut req = ws::WebsocketsRequest::new(url, self.0.clone());
        for (key, value) in self.0.headers.iter() {
            req.head.headers.insert(key.clone(), value.clone());
        }
        req
    }
}