Struct svc_telemetry::grpc::client::Channel
source · pub struct Channel { /* private fields */ }Expand description
A default batteries included transport channel.
This provides a fully featured http2 gRPC client based on [hyper::Client]
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<K>(
capacity: usize
) -> (Channel, Sender<Change<K, Endpoint>>)where
K: Hash + Eq + Send + Clone + 'static,
pub fn balance_channel<K>(
capacity: usize
) -> (Channel, Sender<Change<K, Endpoint>>)where
K: Hash + Eq + Send + Clone + 'static,
Trait Implementations§
source§impl Service<Request<UnsyncBoxBody<Bytes, Status>>> for Channel
impl Service<Request<UnsyncBoxBody<Bytes, Status>>> for Channel
§type Future = ResponseFuture
type Future = ResponseFuture
The future response value.
Auto Trait Implementations§
impl !RefUnwindSafe for Channel
impl Send for Channel
impl Sync for Channel
impl Unpin for Channel
impl !UnwindSafe for Channel
Blanket Implementations§
§impl<T> Conv for T
impl<T> Conv for T
§impl<T> FmtForward for T
impl<T> FmtForward for T
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Self: LowerHex,
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&'a Self: for<'a> IntoIterator,
fn fmt_list(self) -> FmtList<Self>where
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Formats each item in a sequence. Read more
source§impl<T, ReqBody, ResBody> GrpcService<ReqBody> for Twhere
T: Service<Request<ReqBody>, Response = Response<ResBody>>,
<T as Service<Request<ReqBody>>>::Error: Into<Box<dyn Error + Sync + Send + 'static, Global>>,
ResBody: Body,
<ResBody as Body>::Error: Into<Box<dyn Error + Sync + Send + 'static, Global>>,
impl<T, ReqBody, ResBody> GrpcService<ReqBody> for Twhere
T: Service<Request<ReqBody>, Response = Response<ResBody>>,
<T as Service<Request<ReqBody>>>::Error: Into<Box<dyn Error + Sync + Send + 'static, Global>>,
ResBody: Body,
<ResBody as Body>::Error: Into<Box<dyn Error + Sync + Send + 'static, Global>>,
§type ResponseBody = ResBody
type ResponseBody = ResBody
Responses body given by the service.
source§fn poll_ready(
&mut self,
cx: &mut Context<'_>
) -> Poll<Result<(), <T as GrpcService<ReqBody>>::Error>>
fn poll_ready(
&mut self,
cx: &mut Context<'_>
) -> Poll<Result<(), <T as GrpcService<ReqBody>>::Error>>
Returns
Ready when the service is able to process requests. Read moresource§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoRequest<T> for T
impl<T> IntoRequest<T> for T
source§fn into_request(self) -> Request<T>
fn into_request(self) -> Request<T>
Wrap the input message
T in a tonic::Request§impl<T> Pipe for Twhere
T: ?Sized,
impl<T> Pipe for Twhere
T: ?Sized,
§fn pipe<R>(self, func: impl FnOnce(Self) -> R) -> Rwhere
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§fn into_make_service(self) -> IntoMakeService<S>
fn into_make_service(self) -> IntoMakeService<S>
Convert this service into a
MakeService, that is a [Service] whose
response is another service. Read more§impl<T, Request> ServiceExt<Request> for Twhere
T: Service<Request> + ?Sized,
impl<T, Request> ServiceExt<Request> for Twhere
T: Service<Request> + ?Sized,
§fn ready(&mut self) -> Ready<'_, Self, Request>where
Self: Sized,
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Self: Sized,
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§fn ready_and(&mut self) -> Ready<'_, Self, Request>where
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fn ready_and(&mut self) -> Ready<'_, Self, Request>where
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👎Deprecated since 0.4.6: please use the
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§fn ready_oneshot(self) -> ReadyOneshot<Self, Request>where
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§fn oneshot(self, req: Request) -> Oneshot<Self, Request>where
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Executes a new future after this service’s future resolves. This does
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