Add split_partition_queue to StreamConsumer

changelog.md

@@ -4,6 +4,28 @@ See also the [rdkafka-sys changelog](rdkafka-sys/changelog.md).
 
 ## Unreleased
 
+* Add the `StreamConsumer::split_partition_queue` method to mirror
+  `BaseConsumer::split_partition_queue` ([#411]).
+
+  Thanks to [@davidblewett], [@duarten], and [@nemosupremo] for contributing to
+  the implementation.
+
+* **Breaking change.** Remove the `StreamConsumerContext` type and the
+  `ConsumerContext::message_queue_nonempty_callback` method. These were
+  essentially implementation details of `StreamConsumer` that had leaked into
+  the public API. The vast majority of users should be unaffected.
+
+* **Breaking change.** Remove the type parameters from the `MessageStream` type.
+
+* **Breaking change.** Add the received `TopicPartitionList` to the
+  `Rebalance::Revoke` variant, which is useful when using incremental
+  cooperative rebalancing ([#398]).
+
+* Avoid crashing if librdkafka invokes the commit callback with a null
+  topic partition list ([#406]).
+
+  Thanks, [@thijsc].
+
 * Add the new statistics fields in librdkafka v1.7.0 to the various statistics
   types. The new fields are:
 
@@ -46,11 +68,28 @@ See also the [rdkafka-sys changelog](rdkafka-sys/changelog.md).
   statistics from librdkafka. The default implementation calls
   `ClientContext::stats` with the decoded statistics.
 
-* **Breaking change.** Add the received `TopicPartitionList` to the
-  `Rebalance::Revoke` variant, which is useful when using incremental
-  cooperative rebalancing ([#398]).
+* Add the `Default` trait to the statistics types: `Statistics`, `Broker`,
+  `Window`, `TopicPartition`, `Topic`, `Partition`, `ConsumerGroup`, and
+  `ExactlyOnceSemantics` ([#410]).
+
+  Thanks, [@scanterog].
+
+* Add the `Debug` trait to `DefaultClientContext` and `DefaultConsumerContext`
+  ([#401]).
+
+  Thanks, [@DXist].
 
 [#398]: https://github.com/fede1024/rust-rdkafka/issues/398
+[#401]: https://github.com/fede1024/rust-rdkafka/issues/401
+[#406]: https://github.com/fede1024/rust-rdkafka/issues/406
+[#410]: https://github.com/fede1024/rust-rdkafka/issues/410
+[#411]: https://github.com/fede1024/rust-rdkafka/issues/411
+[@davidblewett]: https://github.com/davidblewett
+[@duarten]: https://github.com/duarten
+[@DXist]: https://github.com/DXist
+[@nemosupremo]: https://github.com/nemosupremo
+[@scanterog]: https://github.com/scanterog
+[@thijsc]: https://github.com/thijsc
 
 <a name="0.27.0"></a>
 ## 0.27.0 (2021-10-17)

src/client.rs

@@ -107,8 +107,9 @@ pub trait ClientContext: Send + Sync {
     }
 
     // NOTE: when adding a new method, remember to add it to the
-    // StreamConsumerContext and FutureProducerContext as well.
-    // https://github.com/rust-lang/rfcs/pull/1406 will maybe help in the future.
+    // FutureProducerContext as well.
+    // https://github.com/rust-lang/rfcs/pull/1406 will maybe help in the
+    // future.
 }
 
 /// An empty [`ClientContext`] that can be used when no customizations are

src/consumer/base_consumer.rs

@@ -62,25 +62,6 @@ unsafe extern "C" fn native_rebalance_cb<C: ConsumerContext>(
     context.rebalance(&native_client, err, &mut tpl);
 }
 
-/// Native message queue nonempty callback. This callback will run whenever the
-/// consumer's message queue switches from empty to nonempty.
-unsafe extern "C" fn native_message_queue_nonempty_cb<C: ConsumerContext>(
-    _: *mut RDKafka,
-    opaque_ptr: *mut c_void,
-) {
-    let context = &mut *(opaque_ptr as *mut C);
-
-    (*context).message_queue_nonempty_callback();
-}
-
-unsafe fn enable_nonempty_callback<C: ConsumerContext>(queue: &NativeQueue, context: &Arc<C>) {
-    rdsys::rd_kafka_queue_cb_event_enable(
-        queue.ptr(),
-        Some(native_message_queue_nonempty_cb::<C>),
-        Arc::as_ptr(context) as *mut c_void,
-    )
-}
-
 /// A low-level consumer that requires manual polling.
 ///
 /// This consumer must be periodically polled to make progress on rebalancing,
@@ -91,7 +72,6 @@ where
 {
     client: Client<C>,
     main_queue_min_poll_interval: Timeout,
-    _queue: Option<NativeQueue>,
 }
 
 impl FromClientConfig for BaseConsumer {
@@ -133,16 +113,9 @@ where
             RDKafkaType::RD_KAFKA_CONSUMER,
             context,
         )?;
-        let queue = client.consumer_queue();
-        if let Some(queue) = &queue {
-            unsafe {
-                enable_nonempty_callback(queue, client.context());
-            }
-        }
         Ok(BaseConsumer {
             client,
             main_queue_min_poll_interval,
-            _queue: queue,
         })
     }
 
@@ -269,10 +242,7 @@ where
             ))
         };
         queue.map(|queue| {
-            unsafe {
-                enable_nonempty_callback(&queue, self.client.context());
-                rdsys::rd_kafka_queue_forward(queue.ptr(), ptr::null_mut());
-            }
+            unsafe { rdsys::rd_kafka_queue_forward(queue.ptr(), ptr::null_mut()) }
             PartitionQueue::new(self.clone(), queue)
         })
     }
@@ -623,15 +593,15 @@ pub struct PartitionQueue<C>
 where
     C: ConsumerContext,
 {
-    consumer: Arc<BaseConsumer<C>>,
-    queue: NativeQueue,
+    pub(crate) consumer: Arc<BaseConsumer<C>>,
+    pub(crate) queue: NativeQueue,
 }
 
 impl<C> PartitionQueue<C>
 where
     C: ConsumerContext,
 {
-    fn new(consumer: Arc<BaseConsumer<C>>, queue: NativeQueue) -> Self {
+    pub(crate) fn new(consumer: Arc<BaseConsumer<C>>, queue: NativeQueue) -> Self {
         PartitionQueue { consumer, queue }
     }
 

src/consumer/mod.rs

@@ -130,13 +130,6 @@ pub trait ConsumerContext: ClientContext {
     fn main_queue_min_poll_interval(&self) -> Timeout {
         Timeout::After(Duration::from_secs(1))
     }
-
-    /// Message queue nonempty callback. This method will run when the
-    /// consumer's message queue switches from empty to nonempty.
-    fn message_queue_nonempty_callback(&self) {}
-
-    // NOTE: when adding a new method, remember to add it to the
-    // StreamConsumerContext as well.
 }
 
 /// An inert [`ConsumerContext`] that can be used when no customizations are