intrepid-core 0.1.3

Manage complex async business logic with ease
Documentation 
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use crate::{Context, Frame};

use super::{Extractor, Message, MessageFrameError};

/// Extract the URI of a message from a frame.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct MessageUri(pub String);

impl<State> Extractor<State> for MessageUri {
    type Error = MessageFrameError;

    fn extract(frame: Frame, context: &Context<State>) -> Result<Self, Self::Error>
    where
        Self: Sized,
    {
        let Message(message_frame) = Message::extract(frame, context)?;

        Ok(Self(message_frame.uri))
    }
}

#[test]
fn message_uri() -> Result<(), MessageFrameError> {
    let frame = Frame::message("/test", (), ());
    let context = Context::<()>::default();
    let MessageUri(message_uri) = MessageUri::extract(frame, &context)?;

    assert_eq!(message_uri, "/test");

    Ok(())
}

#[test]
fn failure() -> Result<(), MessageFrameError> {
    use crate::{Error, ExtractorError};

    let context = Context::<()>::default();
    let result = MessageUri::extract_from_frame_and_state(Frame::default(), &context);

    assert!(matches!(
        result.unwrap_err(),
        Error::ExtractorError(ExtractorError::MessageFrameError(
            MessageFrameError::WrongFrame(_)
        ))
    ),);

    Ok(())
}