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use log::trace; use parking_lot::{Mutex, MutexGuard}; use std::{ collections::VecDeque, fmt, sync::Arc, }; use crate::{ BasicProperties, error::Error, message::Delivery, types::ShortString, wait::NotifyReady, }; pub trait ConsumerDelegate: Send + Sync { fn on_new_delivery(&self, delivery: Delivery); fn drop_prefetched_messages(&self) {} fn on_canceled(&self) {} fn on_error(&self, _error: Error) {} } #[derive(Clone)] pub struct Consumer { inner: Arc<Mutex<ConsumerInner>>, } impl Consumer { pub(crate) fn new(consumer_tag: ShortString) -> Consumer { Consumer { inner: Arc::new(Mutex::new(ConsumerInner::new(consumer_tag))), } } pub fn inner(&self) -> MutexGuard<'_, ConsumerInner> { self.inner.lock() } pub fn set_delegate(&self, delegate: Box<dyn ConsumerDelegate>) { let mut inner = self.inner(); for delivery in inner.deliveries.drain(..) { delegate.on_new_delivery(delivery); } inner.delegate = Some(delegate); } pub(crate) fn start_new_delivery(&mut self, delivery: Delivery) { self.inner().current_message = Some(delivery) } pub(crate) fn set_delivery_properties(&mut self, properties: BasicProperties) { if let Some(delivery) = self.inner().current_message.as_mut() { delivery.properties = properties; } } pub(crate) fn receive_delivery_content(&mut self, payload: Vec<u8>) { if let Some(delivery) = self.inner().current_message.as_mut() { delivery.receive_content(payload); } } pub(crate) fn new_delivery_complete(&mut self) { let mut inner = self.inner(); if let Some(delivery) = inner.current_message.take() { inner.new_delivery(delivery); } } pub(crate) fn drop_prefetched_messages(&self) { self.inner().drop_prefetched_messages(); } pub(crate) fn cancel(&self) { self.inner().cancel(); } pub(crate) fn set_error(&self, error: Error) { self.inner().set_error(error); } } pub struct ConsumerInner { current_message: Option<Delivery>, deliveries: VecDeque<Delivery>, task: Option<Box<dyn NotifyReady + Send>>, canceled: bool, tag: ShortString, delegate: Option<Box<dyn ConsumerDelegate>>, error: Option<Error>, } impl fmt::Debug for ConsumerInner { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { write!(f, "ConsumerInnder({})", self.tag) } } impl ConsumerInner { fn new(consumer_tag: ShortString) -> Self { Self { current_message: None, deliveries: VecDeque::new(), task: None, canceled: false, tag: consumer_tag, delegate: None, error: None, } } pub fn next_delivery(&mut self) -> Option<Delivery> { self.deliveries.pop_front() } pub fn set_task(&mut self, task: Box<dyn NotifyReady + Send>) { self.task = Some(task); } pub fn has_task(&self) -> bool { self.task.is_some() } pub fn canceled(&self) -> bool { self.canceled } pub fn error(&mut self) -> Option<Error> { self.error.take() } pub fn tag(&self) -> &ShortString { &self.tag } fn new_delivery(&mut self, delivery: Delivery) { trace!("new_delivery; consumer_tag={}", self.tag); if let Some(delegate) = self.delegate.as_ref() { delegate.on_new_delivery(delivery); } else { self.deliveries.push_back(delivery); } if let Some(task) = self.task.as_ref() { task.notify(); } } fn drop_prefetched_messages(&mut self) { trace!("drop_prefetched_messages; consumer_tag={}", self.tag); if let Some(delegate) = self.delegate.as_ref() { delegate.drop_prefetched_messages(); } self.deliveries.clear(); } fn cancel(&mut self) { trace!("cancel; consumer_tag={}", self.tag); if let Some(delegate) = self.delegate.as_ref() { delegate.on_canceled(); } self.deliveries.clear(); self.canceled = true; self.task.take(); } pub fn set_error(&mut self, error: Error) { trace!("set_error; consumer_tag={}", self.tag); self.error = Some(error); self.cancel(); } } impl fmt::Debug for Consumer { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { write!(f, "Consumer({})", self.inner().tag()) } } #[cfg(feature = "futures")] mod futures { use super::*; use ::futures::stream::Stream; use std::{ pin::Pin, task::{Context, Poll}, }; use crate::confirmation::futures::Watcher; impl Stream for Consumer { type Item = Result<Delivery, Error>; fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> { trace!("consumer poll; polling transport"); let mut inner = self.inner(); trace!("consumer poll; acquired inner lock, consumer_tag={}", inner.tag()); if !inner.has_task() { inner.set_task(Box::new(Watcher(cx.waker().clone()))); } if let Some(delivery) = inner.next_delivery() { trace!("delivery; consumer_tag={}, delivery_tag={:?}", inner.tag(), delivery.delivery_tag); Poll::Ready(Some(Ok(delivery))) } else if inner.canceled() { trace!("consumer canceled; consumer_tag={}", inner.tag()); if let Some(error) = inner.error() { Poll::Ready(Some(Err(error))) } else { Poll::Ready(None) } } else { trace!("delivery; status=NotReady, consumer_tag={}", inner.tag()); Poll::Pending } } } }