httpclient 0.26.1

HTTP client with middleware. Middleware provides composable support for record/replay, logging, exponential backoff, and more.
Documentation 
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use http::HeaderValue;
use http_body_util::BodyExt;
use http_body::Body as HttpBodyTrait;

#[cfg(feature = "stream")]
use futures_core::Stream;
#[cfg(feature = "stream")]
use std::pin::Pin;
#[cfg(feature = "stream")]
use std::task::{Context, Poll};

pub use memory::*;

use crate::error::ProtocolResult;

mod memory;

#[derive(Debug)]
pub enum Body {
    InMemory(InMemoryBody),
    Incoming(hyper::body::Incoming),
}

impl Body {
    pub fn is_empty(&self) -> bool {
        match self {
            Body::Incoming(b) => b.size_hint().upper() == Some(0),
            Body::InMemory(m) => m.is_empty(),
        }
    }

    pub async fn into_memory(self) -> ProtocolResult<InMemoryBody> {
        match self {
            Body::InMemory(m) => Ok(m),
            Body::Incoming(incoming_body) => {
                let bytes = incoming_body.collect().await?.to_bytes();
                Ok(InMemoryBody::Bytes(bytes.to_vec()))
            }
        }
    }

    pub async fn into_content_type(self, content_type: Option<&HeaderValue>) -> ProtocolResult<InMemoryBody> {
        match self {
            Body::InMemory(m) => Ok(m),
            Body::Incoming(incoming_body) => {
                let bytes = incoming_body.collect().await?.to_bytes();
                Self::process_bytes(bytes, content_type)
            }
        }
    }

    fn process_bytes(bytes: bytes::Bytes, content_type: Option<&HeaderValue>) -> ProtocolResult<InMemoryBody> {
        let content_type = content_type.and_then(|t| t.to_str().ok()).and_then(|t| t.split(';').next());
        match content_type {
            Some("application/json") => {
                let value = serde_json::from_slice(&bytes)?;
                Ok(InMemoryBody::Json(value))
            }
            Some("application/octet-stream") => Ok(InMemoryBody::Bytes(bytes.to_vec())),
            _ if bytes.is_empty() => Ok(InMemoryBody::Empty),
            _ => match String::from_utf8(bytes.to_vec()) {
                Ok(text) => Ok(InMemoryBody::Text(text)),
                Err(e) => {
                    let bytes = e.into_bytes();
                    Ok(InMemoryBody::Bytes(bytes))
                }
            },
        }
    }
}

impl Default for Body {
    fn default() -> Self {
        Body::InMemory(InMemoryBody::default())
    }
}

impl From<InMemoryBody> for Body {
    fn from(value: InMemoryBody) -> Self {
        Body::InMemory(value)
    }
}

impl From<Body> for http_body_util::Full<bytes::Bytes> {
    fn from(val: Body) -> Self {
        match val {
            Body::InMemory(body) => body.into(),
            Body::Incoming(_) => panic!("Cannot convert Incoming body to Full body directly"),
        }
    }
}

impl From<InMemoryBody> for http_body_util::Full<bytes::Bytes> {
    fn from(val: InMemoryBody) -> Self {
        match val {
            InMemoryBody::Empty => http_body_util::Full::new(bytes::Bytes::new()),
            InMemoryBody::Text(s) => http_body_util::Full::new(bytes::Bytes::from(s)),
            InMemoryBody::Bytes(b) => http_body_util::Full::new(bytes::Bytes::from(b)),
            InMemoryBody::Json(value) => {
                let b = serde_json::to_vec(&value).unwrap();
                http_body_util::Full::new(bytes::Bytes::from(b))
            }
        }
    }
}


impl From<hyper::body::Incoming> for Body {
    fn from(val: hyper::body::Incoming) -> Self {
        Body::Incoming(val)
    }
}

#[cfg(feature = "stream")]
pub struct DataStream(pub Body);

#[cfg(feature = "stream")]
impl Stream for DataStream {
    type Item = crate::Result<bytes::Bytes>;

    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
        match &mut self.0 {
            Body::Incoming(incoming) => {
                match Pin::new(incoming).poll_frame(cx) {
                    Poll::Ready(Some(Ok(frame))) => {
                        if let Ok(data) = frame.into_data() {
                            Poll::Ready(Some(Ok(data)))
                        } else {
                            // Skip trailers and continue polling
                            self.poll_next(cx)
                        }
                    }
                    Poll::Ready(Some(Err(e))) => Poll::Ready(Some(Err(crate::Error::Protocol(e.into())))),
                    Poll::Ready(None) => Poll::Ready(None),
                    Poll::Pending => Poll::Pending,
                }
            }
            Body::InMemory(memory_body) => {
                // For in-memory bodies, yield the entire content as a single chunk
                let bytes = match std::mem::take(memory_body).bytes() {
                    Ok(bytes) => bytes,
                    Err(e) => return Poll::Ready(Some(Err(e.into()))),
                };
                if bytes.is_empty() {
                    Poll::Ready(None)
                } else {
                    // Replace with empty to ensure we only yield once
                    *memory_body = InMemoryBody::Empty;
                    Poll::Ready(Some(Ok(bytes)))
                }
            }
        }
    }
}

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

    #[test]
    fn test_serialization() {
        let body = InMemoryBody::Json(json!({
            "foo": "bar"
        }));
        assert_eq!(serde_json::to_string(&body).expect("Unable to deserialize JSON"), r#"{"foo":"bar"}"#);
    }
}