pub struct Channel { /* private fields */ }Expand description
A default batteries included transport channel.
This provides a fully featured http2 gRPC client based on hyper
and tower services.
§Multiplexing requests
Sending a request on a channel requires a &mut self and thus can only send
one request in flight. This is intentional and is required to follow the Service
contract from the tower library which this channel implementation is built on
top of.
tower itself has a concept of poll_ready which is the main mechanism to apply
back pressure. poll_ready takes a &mut self and when it returns Poll::Ready
we know the Service is able to accept only one request before we must poll_ready
again. Due to this fact any async fn that wants to poll for readiness and submit
the request must have a &mut self reference.
To work around this and to ease the use of the channel, Channel provides a
Clone implementation that is cheap. This is because at the very top level
the channel is backed by a tower_buffer::Buffer which runs the connection
in a background task and provides a mpsc channel interface. Due to this
cloning the Channel type is cheap and encouraged.
Implementations§
Source§impl Channel
impl Channel
Sourcepub fn from_static(s: &'static str) -> Endpoint
pub fn from_static(s: &'static str) -> Endpoint
Create an Endpoint from a static string.
Channel::from_static("https://example.com");Create an Endpoint from shared bytes.
Channel::from_shared("https://example.com");Sourcepub fn balance_list(list: impl Iterator<Item = Endpoint>) -> Channel
pub fn balance_list(list: impl Iterator<Item = Endpoint>) -> Channel
Sourcepub fn balance_channel_with_executor<K, E>(
capacity: usize,
executor: E,
) -> (Channel, Sender<Change<K, Endpoint>>)
pub fn balance_channel_with_executor<K, E>( capacity: usize, executor: E, ) -> (Channel, Sender<Change<K, Endpoint>>)
Sourcepub fn new<C>(connector: C, endpoint: Endpoint) -> Channel
pub fn new<C>(connector: C, endpoint: Endpoint) -> Channel
Create a new Channel using a custom connector to the provided Endpoint.
This is a lower level API, prefer to use Endpoint::connect_lazy if you are not using a custom connector.
Trait Implementations§
Source§impl Service<Request<Body>> for Channel
impl Service<Request<Body>> for Channel
Auto Trait Implementations§
impl Freeze for Channel
impl !RefUnwindSafe for Channel
impl Send for Channel
impl Sync for Channel
impl Unpin for Channel
impl !UnwindSafe for Channel
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