azure-functions 0.4.0

Azure Functions for Rust
Documentation 
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use crate::http::{Body, ResponseBuilder, Status};
use crate::rpc::protocol;
use std::collections::HashMap;

/// Represents a HTTP output binding.
///
/// Responses can be created for any type that implements `Into<Body>`.
///
/// # Examples
///
/// Creating a response from a string:
///
/// ```rust
/// use azure_functions::bindings::HttpResponse;
/// use azure_functions::http::{Body, Status};
///
/// let response: HttpResponse = "hello world".into();
///
/// assert_eq!(response.status(), Status::Ok);
/// assert_eq!(
///     response
///         .headers()
///         .get("Content-Type")
///         .unwrap(),
///     "text/plain");
/// assert_eq!(
///     response.body().as_str().unwrap(),
///     "hello world"
/// );
/// ```
///
/// Creating a response from a JSON value (see the [json! macro](https://docs.serde.rs/serde_json/macro.json.html) from the `serde_json` crate):
///
/// ```rust
/// # #[macro_use] extern crate serde_json;
/// # extern crate azure_functions;
/// use azure_functions::bindings::HttpResponse;
/// use azure_functions::http::{Body, Status};
///
/// let response: HttpResponse = json!({ "hello": "world!" }).into();
///
/// assert_eq!(response.status(), Status::Ok);
/// assert_eq!(
///     response
///         .headers()
///         .get("Content-Type")
///         .unwrap(),
///     "application/json"
/// );
/// assert_eq!(
///     response.body().as_str().unwrap(),
///     "{\"hello\":\"world!\"}"
/// );
/// ```
///
/// Creating a response from a sequence of bytes:
///
/// ```rust
/// use azure_functions::bindings::HttpResponse;
/// use azure_functions::http::{Body, Status};
///
/// let response: HttpResponse = [1, 2, 3][..].into();
///
/// assert_eq!(response.status(), Status::Ok);
/// assert_eq!(
///     response
///         .headers()
///         .get("Content-Type")
///         .unwrap(),
///     "application/octet-stream"
/// );
/// assert_eq!(
///     response.body().as_bytes(),
///     [1, 2, 3]
/// );
/// ```
///
/// Building a custom response:
///
/// ```rust
/// use azure_functions::bindings::HttpResponse;
/// use azure_functions::http::{Body, Status};
///
/// let url = "http://example.com";
/// let body = format!("The requested resource has moved to: {}", url);
///
/// let response: HttpResponse = HttpResponse::build()
///     .status(Status::MovedPermanently)
///     .header("Location", url)
///     .body(body.as_str())
///     .into();
///
/// assert_eq!(response.status(), Status::MovedPermanently);
/// assert_eq!(
///     response
///         .headers()
///         .get("Location")
///         .unwrap(),
///     url
/// );
/// assert_eq!(
///     response.body().as_str().unwrap(),
///     body
/// );
/// ```
#[derive(Default, Debug)]
pub struct HttpResponse {
    pub(crate) data: protocol::RpcHttp,
    pub(crate) status: Status,
}

impl HttpResponse {
    pub(crate) fn new() -> Self {
        HttpResponse {
            data: protocol::RpcHttp::new(),
            status: Status::Ok,
        }
    }

    /// Creates a new [ResponseBuilder](../http/struct.ResponseBuilder.html) for building a response.
    ///
    /// # Examples
    ///
    /// ```rust
    /// use azure_functions::bindings::HttpResponse;
    /// use azure_functions::http::Status;
    ///
    /// let response: HttpResponse = HttpResponse::build().status(Status::NotFound).into();
    /// assert_eq!(response.status(), Status::NotFound);
    /// ```
    pub fn build() -> ResponseBuilder {
        ResponseBuilder::new()
    }

    /// Gets the status code for the response.
    ///
    /// # Examples
    ///
    /// ```rust
    /// use azure_functions::bindings::HttpResponse;
    /// use azure_functions::http::Status;
    ///
    /// let response: HttpResponse = HttpResponse::build().status(Status::BadRequest).into();
    /// assert_eq!(response.status(), Status::BadRequest);
    /// ```
    pub fn status(&self) -> Status {
        self.status
    }

    /// Gets the body of the response.
    ///
    /// # Examples
    ///
    /// ```rust
    /// use azure_functions::bindings::HttpResponse;
    ///
    /// let response: HttpResponse = HttpResponse::build().body("example").into();
    /// assert_eq!(response.body().as_str().unwrap(), "example");
    /// ```
    pub fn body(&self) -> Body {
        if self.data.has_body() {
            Body::from(self.data.get_body())
        } else {
            Body::Empty
        }
    }

    /// Gets the headers of the response.
    ///
    /// # Examples
    ///
    /// ```rust
    /// use azure_functions::bindings::HttpResponse;
    ///
    /// let response: HttpResponse = HttpResponse::build().header("Content-Type", "text/plain").into();
    /// assert_eq!(response.headers().get("Content-Type").unwrap(), "text/plain");
    /// ```
    pub fn headers(&self) -> &HashMap<String, String> {
        &self.data.headers
    }
}

impl<'a, T> From<T> for HttpResponse
where
    T: Into<Body<'a>>,
{
    fn from(data: T) -> Self {
        HttpResponse::build().body(data).into()
    }
}

impl From<ResponseBuilder> for HttpResponse {
    fn from(builder: ResponseBuilder) -> Self {
        builder.0
    }
}

impl Into<protocol::TypedData> for HttpResponse {
    fn into(mut self) -> protocol::TypedData {
        self.data.set_status_code(self.status.to_string());

        let mut data = protocol::TypedData::new();
        data.set_http(self.data);
        data
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn it_is_empty_by_default() {
        let response = HttpResponse::new();

        assert_eq!(response.status(), Status::Ok);
        assert!(matches!(response.body(), Body::Empty));
    }

    #[test]
    fn it_is_empty_from_a_builder() {
        let response: HttpResponse = HttpResponse::build().into();

        assert_eq!(response.status(), Status::Ok);
        assert!(matches!(response.body(), Body::Empty));
    }

    #[test]
    fn it_builds_with_a_status() {
        let response: HttpResponse = HttpResponse::build().status(Status::Continue).into();

        assert_eq!(response.status(), Status::Continue);
    }

    #[test]
    fn it_builds_with_a_string_body() {
        const BODY: &'static str = "test body";

        let response: HttpResponse = HttpResponse::build().body(BODY).into();

        assert_eq!(
            response.headers().get("Content-Type").unwrap(),
            "text/plain"
        );
        assert_eq!(response.body().as_str().unwrap(), BODY);
    }

    #[test]
    fn it_builds_with_a_json_body() {
        #[derive(Serialize, Deserialize)]
        struct Data {
            message: String,
        };

        const MESSAGE: &'static str = "test";

        let data = Data {
            message: MESSAGE.to_string(),
        };

        let response: HttpResponse = HttpResponse::build()
            .body(::serde_json::to_value(data).unwrap())
            .into();

        assert_eq!(
            response.headers().get("Content-Type").unwrap(),
            "application/json"
        );
        assert_eq!(response.body().as_json::<Data>().unwrap().message, MESSAGE);
    }

    #[test]
    fn it_builds_with_a_bytes_body() {
        const BODY: &'static [u8] = &[1, 2, 3];

        let response: HttpResponse = HttpResponse::build().body(BODY).into();

        assert_eq!(
            response.headers().get("Content-Type").unwrap(),
            "application/octet-stream"
        );
        assert_eq!(response.body().as_bytes(), BODY);
    }

    #[test]
    fn it_builds_with_headers() {
        let response: HttpResponse = HttpResponse::build()
            .header("header1", "value1")
            .header("header2", "value2")
            .header("header3", "value3")
            .into();

        assert_eq!(response.headers().get("header1").unwrap(), "value1");
        assert_eq!(response.headers().get("header2").unwrap(), "value2");
        assert_eq!(response.headers().get("header3").unwrap(), "value3");
    }

    #[test]
    fn it_converts_to_typed_data() {
        let response: HttpResponse = HttpResponse::build()
            .status(Status::BadRequest)
            .header("header", "value")
            .body("body")
            .into();

        let data: protocol::TypedData = response.into();
        assert!(data.has_http());

        let http = data.get_http();
        assert_eq!(http.get_status_code(), "400");
        assert_eq!(http.get_headers().get("header").unwrap(), "value");
        assert!(http.get_body().has_string());
        assert_eq!(http.get_body().get_string(), "body");
    }
}