trillium-testing 0.10.0

use std::{
    fmt::Debug,
    net::IpAddr,
    ops::{Deref, DerefMut},
    sync::Arc,
};
use trillium::{Conn, Handler, HeaderName, HeaderValues, Method, Transport};
use trillium_http::{Conn as HttpConn, HttpContext, Synthetic};

type SyntheticConn = HttpConn<Synthetic>;

/// A wrapper around a [`trillium::Conn`] for testing
///
/// Stability note: this may be replaced by an extension trait at some point.
#[derive(Debug)]
pub struct TestConn(Conn);

impl TestConn {
    /// constructs a new TestConn with the provided method, path, and body.
    /// ```
    /// use trillium_testing::{TestConn, prelude::*};
    /// let mut conn = TestConn::build("get", "/", "body");
    /// assert_eq!(conn.method(), Method::Get);
    /// assert_eq!(conn.path(), "/");
    /// assert_eq!(conn.take_request_body_string(), "body");
    /// ```
    pub fn build<M>(method: M, path: impl Into<String>, body: impl Into<Synthetic>) -> Self
    where
        M: TryInto<Method>,
        <M as TryInto<Method>>::Error: Debug,
    {
        Self(HttpConn::new_synthetic(method.try_into().unwrap(), path.into(), body).into())
    }

    /// assigns a shared server config to this test conn
    pub fn with_context(self, context: Arc<HttpContext>) -> Self {
        let inner = self
            .0
            .into_inner::<Synthetic>()
            .with_context(context)
            .into();

        Self(inner)
    }

    /// chainable constructor to append a request header to the TestConn
    /// ```
    /// use trillium_testing::TestConn;
    /// let conn = TestConn::build("get", "/", "body").with_request_header("some-header", "value");
    /// assert_eq!(conn.request_headers().get_str("some-header"), Some("value"));
    /// ```
    pub fn with_request_header(
        self,
        header_name: impl Into<HeaderName<'static>>,
        header_value: impl Into<HeaderValues>,
    ) -> Self {
        let mut inner: SyntheticConn = self.into();
        inner
            .request_headers_mut()
            .append(header_name, header_value);
        Self(inner.into())
    }

    /// chainable constructor to replace the request body. this is useful
    /// when chaining with a [`trillium_testing::methods`](crate::methods)
    /// builder, as they do not provide a way to specify the body.
    ///
    /// ```
    /// use trillium_testing::{TestConn, methods::post};
    /// let mut conn = post("/").with_request_body("some body");
    /// assert_eq!(conn.take_request_body_string(), "some body");
    ///
    /// let mut conn = TestConn::build("post", "/", "some body").with_request_body("once told me");
    /// assert_eq!(conn.take_request_body_string(), "once told me");
    /// ```
    pub fn with_request_body(self, body: impl Into<Synthetic>) -> Self {
        let mut inner: SyntheticConn = self.into();
        inner.replace_body(body);
        Self(inner.into())
    }

    /// sets the peer ip for this test conn
    pub fn with_peer_ip(mut self, ip: IpAddr) -> Self {
        self.set_peer_ip(Some(ip));
        self
    }

    /// set the test conn to be secure
    pub fn secure(mut self) -> Self {
        AsMut::<trillium_http::Conn<Box<dyn Transport>>>::as_mut(&mut self.0).set_secure(true);
        self
    }

    /// set state on the test conn
    pub fn with_state<S>(mut self, state: S) -> Self
    where
        S: Send + Sync + 'static,
    {
        self.0.insert_state(state);
        self
    }

    /// blocks on running this conn against a handler and finalizes
    /// response headers. also aliased as [`TestConn::on`]
    ///
    /// ```
    /// use trillium_testing::prelude::*;
    ///
    /// async fn handler(conn: Conn) -> Conn {
    /// conn.ok("hello trillium")
    /// }
    ///
    /// let conn = get("/").run(&handler);
    /// assert_ok!(conn, "hello trillium", "content-length" => "14");
    /// ```
    pub fn run(self, handler: &impl Handler) -> Self {
        crate::block_on(self.run_async(handler))
    }

    /// runs this conn against a handler and finalizes
    /// response headers.
    ///
    /// ```
    /// use trillium_testing::prelude::*;
    ///
    /// async fn handler(conn: Conn) -> Conn {
    /// conn.ok("hello trillium")
    /// }
    ///
    /// block_on(async move {
    /// let conn = get("/").run_async(&handler).await;
    /// assert_ok!(conn, "hello trillium", "content-length" => "14");
    /// });
    /// ```
    pub async fn run_async(self, handler: &impl Handler) -> Self {
        let conn = handler.run(self.into()).await;
        let mut conn = handler.before_send(conn).await;
        AsMut::<trillium_http::Conn<Box<dyn Transport>>>::as_mut(&mut conn).finalize_headers();
        Self(conn)
    }

    /// blocks on running this conn against a handler and finalizes
    /// response headers. also aliased as [`TestConn::run`].
    ///
    /// ```
    /// use trillium_testing::prelude::*;
    ///
    /// async fn handler(conn: Conn) -> Conn {
    /// conn.ok("hello trillium")
    /// }
    ///
    /// let conn = get("/").on(&handler);
    /// assert_ok!(conn, "hello trillium", "content-length" => "14");
    /// ```
    pub fn on(self, handler: &impl Handler) -> Self {
        self.run(handler)
    }

    /// Reads the response body to string and returns it, if set.
    pub fn take_response_body_string(&mut self) -> Option<String> {
        match self.take_response_body() {
            Some(body) => String::from_utf8(
                futures_lite::future::block_on(body.into_bytes())
                    .unwrap()
                    .to_vec(),
            )
            .ok(),
            _ => None,
        }
    }

    /// Reads the request body to string and returns it
    pub fn take_request_body_string(&mut self) -> String {
        futures_lite::future::block_on(async { self.request_body().read_string().await.unwrap() })
    }
}

impl From<Conn> for TestConn {
    fn from(conn: Conn) -> Self {
        Self(conn)
    }
}

impl From<TestConn> for Conn {
    fn from(tc: TestConn) -> Self {
        tc.0
    }
}

impl From<TestConn> for SyntheticConn {
    fn from(tc: TestConn) -> Self {
        tc.0.into_inner()
    }
}

impl Deref for TestConn {
    type Target = Conn;

    fn deref(&self) -> &Self::Target {
        &self.0
    }
}

impl DerefMut for TestConn {
    fn deref_mut(&mut self) -> &mut Self::Target {
        &mut self.0
    }
}