## Client

# Struct Client

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    pub struct Client { /* private fields */ }

Expand description

Creates `Publisher` instances.

This is the main entry point for the publisher API. A single `Client` can be used to create multiple `Publisher` clients for different topics. It manages the underlying gRPC connection and authentication.

## §Example

    // Create a client.
    let client = Client::builder().build().await?;

    // Create a publisher for a specific topic.
    let publisher = client.publisher("projects/my-project/topics/my-topic").build();

    // Publish a message.
    let handle = publisher.publish(PubsubMessage::new().set_data("hello world"));
    let message_id = handle.await?;
    println!("Message sent with ID: {}", message_id);

## Implementations§

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### impl Client

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#### pub fn builder() -> ClientBuilder

Returns a builder for Client.

    let client = Client::builder().build().await?;

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#### pub fn publisher<T>(&self, topic: T) -> PublisherBuilder
where T: Into<String>,

Creates a new `Publisher` for a given topic.

    let client = Client::builder().build().await?;
    let publisher = client.publisher("projects/my-project/topics/my-topic").build();
    let message_id = publisher.publish(PubsubMessage::new().set_data("Hello, World")).await?;

## Trait Implementations§

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### impl Clone for Client

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#### fn clone(&self) -> Client

Returns a duplicate of the value. Read more
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#### fn clone_from(&mut self, source: &Self)

Performs copy-assignment from `source`. Read more
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### impl Debug for Client

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

Formats the value using the given formatter. Read more

## Auto Trait Implementations§

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### impl Freeze for Client

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### impl !RefUnwindSafe for Client

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### impl Send for Client

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### impl Sync for Client

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### impl Unpin for Client

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### impl !UnwindSafe for Client

## Blanket Implementations§

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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> CloneToUninit for T
where T: Clone,

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#### unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (`clone_to_uninit`)
Performs copy-assignment from `self` to `dest`. 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> Instrument for T

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#### fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided [`Span`], returning an `Instrumented` wrapper. Read more
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#### fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current `Span`, returning an `Instrumented` wrapper. Read more
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### impl<T, U> Into<U> for T
where U: From<T>,

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#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

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### impl<T> IntoRequest<T> for T

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#### fn into_request(self) -> Request<T>

Wrap the input message `T` in a `tonic::Request`
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### impl<L> LayerExt<L> for L

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#### fn named_layer<S>(&self, service: S) -> Layered<<L as Layer<S>>::Service, S>
where L: Layer<S>,

Applies the layer to a service and wraps it in [`Layered`].
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### impl<T> PolicyExt for T
where T: ?Sized,

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#### fn and<P, B, E>(self, other: P) -> And<T, P>
where T: Policy<B, E>, P: Policy<B, E>,

Create a new `Policy` that returns [`Action::Follow`] only if `self` and `other` return `Action::Follow`. Read more
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#### fn or<P, B, E>(self, other: P) -> Or<T, P>
where T: Policy<B, E>, P: Policy<B, E>,

Create a new `Policy` that returns [`Action::Follow`] if either `self` or `other` returns `Action::Follow`. Read more
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### impl<T> ToOwned for T
where T: Clone,

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#### type Owned = T

The resulting type after obtaining ownership.
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#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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### impl<T, U> TryFrom<U> for T
where U: Into<T>,

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#### type Error = Infallible

The type returned in the event of a conversion error.
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#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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### impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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### impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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#### fn vzip(self) -> V

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### impl<T> WithSubscriber for T

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#### fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided `Subscriber` to this type, returning a [`WithDispatch`] wrapper. Read more
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#### fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default `Subscriber` to this type, returning a [`WithDispatch`] wrapper. Read more