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//! Async byte-stream iterators over response bodies.
use bytes::Bytes;
use http_body_util::BodyExt;
#[cfg(not(target_arch = "wasm32"))]
use crate::clock::Instant;
use crate::error::Error;
#[cfg(not(target_arch = "wasm32"))]
use crate::observer::{self, RequestEvent, RequestPhase, TransferDirection};
#[cfg(not(target_arch = "wasm32"))]
use crate::response::BodyObserverCtx;
use super::RequestBodySend;
#[cfg(not(target_arch = "wasm32"))]
use super::ResponseBodyLocal;
// ── BodyStreamSend ───────────────────────────────────────────────────────────
/// Async iterator over response body data frames.
pub struct BodyStreamSend {
body: RequestBodySend,
done: bool,
/// Trailer headers captured from the body's trailer frame, if any.
trailers: Option<http::HeaderMap>,
#[cfg(not(target_arch = "wasm32"))]
observer_ctx: Option<BodyObserverCtx>,
#[cfg(not(target_arch = "wasm32"))]
cumulative_bytes: u64,
#[cfg(not(target_arch = "wasm32"))]
transfer_start: Instant,
}
impl std::fmt::Debug for BodyStreamSend {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("BodyStreamSend").finish()
}
}
impl BodyStreamSend {
#[cfg(test)]
pub(crate) fn new(body: RequestBodySend) -> Self {
Self {
body,
done: false,
trailers: None,
#[cfg(not(target_arch = "wasm32"))]
observer_ctx: None,
#[cfg(not(target_arch = "wasm32"))]
cumulative_bytes: 0,
#[cfg(not(target_arch = "wasm32"))]
transfer_start: Instant::now(),
}
}
#[cfg(not(target_arch = "wasm32"))]
pub(crate) fn with_observer(body: RequestBodySend, ctx: Option<BodyObserverCtx>) -> Self {
let transfer_start = ctx
.as_ref()
.map(|c| c.response_started)
.unwrap_or_else(Instant::now);
Self {
body,
done: false,
trailers: None,
observer_ctx: ctx,
cumulative_bytes: 0,
transfer_start,
}
}
/// Returns the trailer headers received after the body, if any.
///
/// Only populated once the stream has been fully consumed (i.e. `next()`
/// returned `None`); trailers arrive after the final data frame.
pub fn trailers(&self) -> Option<&http::HeaderMap> {
self.trailers.as_ref()
}
/// Returns the next chunk of body data, or `None` when complete.
pub async fn next(&mut self) -> Option<Result<Bytes, Error>> {
if self.done {
return None;
}
loop {
match self.body.frame().await {
Some(Ok(frame)) => match frame.into_data() {
Ok(data) => {
// Skip empty data frames: a consumer expects `Some` to
// carry non-empty data and `None` to mean end of stream.
if data.is_empty() {
continue;
}
#[cfg(not(target_arch = "wasm32"))]
{
let chunk_bytes = data.len() as u64;
self.cumulative_bytes += chunk_bytes;
if let Some(ctx) = &self.observer_ctx {
ctx.observer.on_event(&RequestEvent {
method: ctx.method.clone(),
uri: ctx.uri.clone(),
phase: RequestPhase::BytesTransferred {
direction: TransferDirection::Download,
chunk_bytes,
cumulative_bytes: self.cumulative_bytes,
elapsed: self.transfer_start.elapsed(),
},
at: observer::Instant::now(),
});
}
}
return Some(Ok(data));
}
Err(frame) => {
// Capture trailers so callers can read them via
// `trailers()` after the stream completes.
match frame.into_trailers() {
Ok(trailers) => {
#[cfg(not(target_arch = "wasm32"))]
if let Some(ctx) = &self.observer_ctx {
let headers: Vec<(String, String)> = trailers
.iter()
.map(|(k, v)| {
(
k.as_str().to_owned(),
v.to_str().unwrap_or("<binary>").to_owned(),
)
})
.collect();
ctx.observer.on_event(&RequestEvent {
method: ctx.method.clone(),
uri: ctx.uri.clone(),
phase: RequestPhase::TrailersReceived { headers },
at: observer::Instant::now(),
});
}
match &mut self.trailers {
Some(existing) => existing.extend(trailers),
None => self.trailers = Some(trailers),
}
}
Err(_non_trailer) => {}
}
}
},
Some(Err(e)) => {
self.done = true;
#[cfg(not(target_arch = "wasm32"))]
self.fire_transfer_aborted(&e);
return Some(Err(e));
}
None => {
self.done = true;
#[cfg(not(target_arch = "wasm32"))]
self.fire_transfer_complete();
return None;
}
}
}
}
#[cfg(not(target_arch = "wasm32"))]
fn fire_transfer_complete(&self) {
if let Some(ctx) = &self.observer_ctx {
let transfer_duration = self.transfer_start.elapsed();
let throughput = if transfer_duration.as_secs_f64() > 0.0 {
(self.cumulative_bytes as f64 / transfer_duration.as_secs_f64()) as f32
} else {
0.0
};
ctx.observer.on_event(&RequestEvent {
method: ctx.method.clone(),
uri: ctx.uri.clone(),
phase: RequestPhase::TransferComplete {
direction: TransferDirection::Download,
total_bytes: self.cumulative_bytes,
transfer_duration,
throughput_bytes_per_sec: throughput,
},
at: observer::Instant::now(),
});
}
}
#[cfg(not(target_arch = "wasm32"))]
fn fire_transfer_aborted(&self, error: &crate::error::Error) {
if let Some(ctx) = &self.observer_ctx {
ctx.observer.on_event(&RequestEvent {
method: ctx.method.clone(),
uri: ctx.uri.clone(),
phase: RequestPhase::TransferAborted {
direction: TransferDirection::Download,
bytes_transferred: self.cumulative_bytes,
elapsed: self.transfer_start.elapsed(),
error: error.to_string(),
},
at: observer::Instant::now(),
});
}
}
}
#[cfg(not(target_arch = "wasm32"))]
impl Drop for BodyStreamSend {
fn drop(&mut self) {
if !self.done {
self.done = true;
self.fire_transfer_aborted(&crate::error::Error::Other("body stream dropped".into()));
}
}
}
// ── BodyStreamLocal ──────────────────────────────────────────────────────────
/// Async iterator over response body data frames for `!Send` bodies.
///
/// Used by completion-based runtimes (compio) where the response body is not `Send`.
#[cfg(not(target_arch = "wasm32"))]
pub struct BodyStreamLocal {
body: ResponseBodyLocal,
done: bool,
trailers: Option<http::HeaderMap>,
observer_ctx: Option<BodyObserverCtx>,
cumulative_bytes: u64,
transfer_start: Instant,
}
#[cfg(not(target_arch = "wasm32"))]
impl std::fmt::Debug for BodyStreamLocal {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("BodyStreamLocal").finish()
}
}
#[cfg(not(target_arch = "wasm32"))]
impl BodyStreamLocal {
pub(crate) fn with_observer(body: ResponseBodyLocal, ctx: Option<BodyObserverCtx>) -> Self {
let transfer_start = ctx
.as_ref()
.map(|c| c.response_started)
.unwrap_or_else(Instant::now);
Self {
body,
done: false,
trailers: None,
observer_ctx: ctx,
cumulative_bytes: 0,
transfer_start,
}
}
/// Returns the trailer headers received after the body, if any.
///
/// Only populated once the stream has been fully consumed.
pub fn trailers(&self) -> Option<&http::HeaderMap> {
self.trailers.as_ref()
}
/// Returns the next chunk of body data, or `None` when complete.
pub async fn next(&mut self) -> Option<Result<Bytes, Error>> {
use std::pin::Pin;
if self.done {
return None;
}
loop {
match Pin::new(&mut self.body).frame().await {
Some(Ok(frame)) => match frame.into_data() {
Ok(data) => {
// Skip empty data frames: a consumer expects `Some` to
// carry non-empty data and `None` to mean end of stream.
if data.is_empty() {
continue;
}
let chunk_bytes = data.len() as u64;
self.cumulative_bytes += chunk_bytes;
if let Some(ctx) = &self.observer_ctx {
ctx.observer.on_event(&RequestEvent {
method: ctx.method.clone(),
uri: ctx.uri.clone(),
phase: RequestPhase::BytesTransferred {
direction: TransferDirection::Download,
chunk_bytes,
cumulative_bytes: self.cumulative_bytes,
elapsed: self.transfer_start.elapsed(),
},
at: observer::Instant::now(),
});
}
return Some(Ok(data));
}
Err(frame) => match frame.into_trailers() {
Ok(trailers) => {
if let Some(ctx) = &self.observer_ctx {
let headers: Vec<(String, String)> = trailers
.iter()
.map(|(k, v)| {
(
k.as_str().to_owned(),
v.to_str().unwrap_or("<binary>").to_owned(),
)
})
.collect();
ctx.observer.on_event(&RequestEvent {
method: ctx.method.clone(),
uri: ctx.uri.clone(),
phase: RequestPhase::TrailersReceived { headers },
at: observer::Instant::now(),
});
}
match &mut self.trailers {
Some(existing) => existing.extend(trailers),
None => self.trailers = Some(trailers),
}
}
Err(_non_trailer) => {}
},
},
Some(Err(e)) => {
self.done = true;
self.fire_transfer_aborted(&e);
return Some(Err(e));
}
None => {
self.done = true;
self.fire_transfer_complete();
return None;
}
}
}
}
fn fire_transfer_complete(&self) {
if let Some(ctx) = &self.observer_ctx {
let transfer_duration = self.transfer_start.elapsed();
let throughput = if transfer_duration.as_secs_f64() > 0.0 {
(self.cumulative_bytes as f64 / transfer_duration.as_secs_f64()) as f32
} else {
0.0
};
ctx.observer.on_event(&RequestEvent {
method: ctx.method.clone(),
uri: ctx.uri.clone(),
phase: RequestPhase::TransferComplete {
direction: TransferDirection::Download,
total_bytes: self.cumulative_bytes,
transfer_duration,
throughput_bytes_per_sec: throughput,
},
at: observer::Instant::now(),
});
}
}
fn fire_transfer_aborted(&self, error: &crate::error::Error) {
if let Some(ctx) = &self.observer_ctx {
ctx.observer.on_event(&RequestEvent {
method: ctx.method.clone(),
uri: ctx.uri.clone(),
phase: RequestPhase::TransferAborted {
direction: TransferDirection::Download,
bytes_transferred: self.cumulative_bytes,
elapsed: self.transfer_start.elapsed(),
error: error.to_string(),
},
at: observer::Instant::now(),
});
}
}
}
#[cfg(not(target_arch = "wasm32"))]
impl Drop for BodyStreamLocal {
fn drop(&mut self) {
if !self.done {
self.done = true;
self.fire_transfer_aborted(&crate::error::Error::Other("body stream dropped".into()));
}
}
}