Struct h2::client::Connection

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pub struct Connection<T, B: Buf = Bytes> { /* private fields */ }
Expand description

Manages all state associated with an HTTP/2 client connection.

A Connection is backed by an I/O resource (usually a TCP socket) and implements the HTTP/2 client logic for that connection. It is responsible for driving the internal state forward, performing the work requested of the associated handles (SendRequest, ResponseFuture, SendStream, RecvStream).

Connection values are created by calling handshake. Once a Connection value is obtained, the caller must repeatedly call poll until Ready is returned. The easiest way to do this is to submit the Connection instance to an executor.

§Examples

    let (send_request, connection) = client::handshake(my_io).await?;
    // Submit the connection handle to an executor.
    tokio::spawn(async { connection.await.expect("connection failed"); });

    // Now, use `send_request` to initialize HTTP/2 streams.
    // ...

Implementations§

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impl<T, B> Connection<T, B>
where T: AsyncRead + AsyncWrite + Unpin, B: Buf,

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pub fn set_target_window_size(&mut self, size: u32)

Sets the target window size for the whole connection.

If size is greater than the current value, then a WINDOW_UPDATE frame will be immediately sent to the remote, increasing the connection level window by size - current_value.

If size is less than the current value, nothing will happen immediately. However, as window capacity is released by FlowControl instances, no WINDOW_UPDATE frames will be sent out until the number of “in flight” bytes drops below size.

The default value is 65,535.

See FlowControl documentation for more details.

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pub fn set_initial_window_size(&mut self, size: u32) -> Result<(), Error>

Set a new INITIAL_WINDOW_SIZE setting (in octets) for stream-level flow control for received data.

The SETTINGS will be sent to the remote, and only applied once the remote acknowledges the change.

This can be used to increase or decrease the window size for existing streams.

§Errors

Returns an error if a previous call is still pending acknowledgement from the remote endpoint.

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pub fn ping_pong(&mut self) -> Option<PingPong>

Takes a PingPong instance from the connection.

§Note

This may only be called once. Calling multiple times will return None.

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pub fn max_concurrent_send_streams(&self) -> usize

Returns the maximum number of concurrent streams that may be initiated by this client.

This limit is configured by the server peer by sending the SETTINGS_MAX_CONCURRENT_STREAMS parameter in a SETTINGS frame. This method returns the currently acknowledged value received from the remote.

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pub fn max_concurrent_recv_streams(&self) -> usize

Returns the maximum number of concurrent streams that may be initiated by the server on this connection.

This returns the value of the SETTINGS_MAX_CONCURRENT_STREAMS parameter sent in a SETTINGS frame that has been acknowledged by the remote peer. The value to be sent is configured by the Builder::max_concurrent_streams method before handshaking with the remote peer.

Trait Implementations§

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impl<T, B> Debug for Connection<T, B>
where T: AsyncRead + AsyncWrite + Debug, B: Debug + Buf,

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fn fmt(&self, fmt: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<T, B> Future for Connection<T, B>
where T: AsyncRead + AsyncWrite + Unpin, B: Buf,

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type Output = Result<(), Error>

The type of value produced on completion.
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fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>

Attempt to resolve the future to a final value, registering the current task for wakeup if the value is not yet available. Read more

Auto Trait Implementations§

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impl<T, B = Bytes> !Freeze for Connection<T, B>

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impl<T, B = Bytes> !RefUnwindSafe for Connection<T, B>

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impl<T, B> Send for Connection<T, B>
where T: Send, B: Send,

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impl<T, B> Sync for Connection<T, B>
where T: Sync, B: Sync + Send,

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impl<T, B> Unpin for Connection<T, B>
where T: Unpin,

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impl<T, B = Bytes> !UnwindSafe for Connection<T, B>

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> FutureExt for T
where T: Future + ?Sized,

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fn map<U, F>(self, f: F) -> Map<Self, F>
where F: FnOnce(Self::Output) -> U, Self: Sized,

Map this future’s output to a different type, returning a new future of the resulting type. Read more
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fn map_into<U>(self) -> MapInto<Self, U>
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Map this future’s output to a different type, returning a new future of the resulting type. Read more
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fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F>
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Wrap this future in an Either future, making it the right-hand variant of that Either. Read more
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fn into_stream(self) -> IntoStream<Self>
where Self: Sized,

Convert this future into a single element stream. Read more
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fn flatten(self) -> Flatten<Self>
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Flatten the execution of this future when the output of this future is itself another future. Read more
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fn flatten_stream(self) -> FlattenStream<Self>
where Self::Output: Stream, Self: Sized,

Flatten the execution of this future when the successful result of this future is a stream. Read more
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fn fuse(self) -> Fuse<Self>
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Fuse a future such that poll will never again be called once it has completed. This method can be used to turn any Future into a FusedFuture. Read more
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fn inspect<F>(self, f: F) -> Inspect<Self, F>
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Do something with the output of a future before passing it on. Read more
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fn catch_unwind(self) -> CatchUnwind<Self>
where Self: Sized + UnwindSafe,

Catches unwinding panics while polling the future. Read more
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fn shared(self) -> Shared<Self>
where Self: Sized, Self::Output: Clone,

Create a cloneable handle to this future where all handles will resolve to the same result. Read more
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fn poll_unpin(&mut self, cx: &mut Context<'_>) -> Poll<Self::Output>
where Self: Unpin,

A convenience for calling Future::poll on Unpin future types.
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fn now_or_never(self) -> Option<Self::Output>
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Evaluates and consumes the future, returning the resulting output if the future is ready after the first call to Future::poll. Read more
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type Ok = T

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fn try_poll( self: Pin<&mut F>, cx: &mut Context<'_>, ) -> Poll<<F as Future>::Output>

Poll this TryFuture as if it were a Future. Read more
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