Struct rocket::Shutdown[][src]

#[must_use = "`Shutdown` does nothing unless polled or `notify`ed"]
pub struct Shutdown(_);
Expand description

A request guard and future for graceful shutdown.

A server shutdown is manually requested by calling Shutdown::notify() or, if enabled, through automatic triggers like Ctrl-C. Rocket will stop accepting new requests, finish handling any pending requests, wait a grace period before cancelling any outstanding I/O, and return Ok() to the caller of Rocket::launch(). Graceful shutdown is configured via config::Shutdown.

Detecting Shutdown

Shutdown is also a future that resolves when Shutdown::notify() is called. This can be used to detect shutdown in any part of the application:

use rocket::Shutdown;

#[get("/wait/for/shutdown")]
async fn wait_for_shutdown(shutdown: Shutdown) -> &'static str {
    shutdown.await;
    "Somewhere, shutdown was requested."
}

See the stream docs for an example of detecting shutdown in an infinite responder.

Additionally, a completed shutdown request resolves the future returned from Rocket::launch():

use rocket::Shutdown;

#[get("/shutdown")]
fn shutdown(shutdown: Shutdown) -> &'static str {
    shutdown.notify();
    "Shutting down..."
}

#[rocket::main]
async fn main() {
    let result = rocket::build()
        .mount("/", routes![shutdown])
        .launch()
        .await;

    // If the server shut down (by visiting `/shutdown`), `result` is `Ok`.
    result.expect("server failed unexpectedly");
}

Implementations

impl Shutdown[src]

pub fn notify(self)[src]

Notify the application to shut down gracefully.

This function returns immediately; pending requests will continue to run until completion or expiration of the grace period, which ever comes first, before the actual shutdown occurs. The grace period can be configured via Shutdown::grace.

use rocket::Shutdown;

#[get("/shutdown")]
fn shutdown(shutdown: Shutdown) -> &'static str {
    shutdown.notify();
    "Shutting down..."
}

Trait Implementations

impl Clone for Shutdown[src]

fn clone(&self) -> Shutdown

Notable traits for Shutdown

impl Future for Shutdown type Output = ();
[src]

Returns a copy of the value. Read more

fn clone_from(&mut self, source: &Self)1.0.0[src]

Performs copy-assignment from source. Read more

impl Debug for Shutdown[src]

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

Formats the value using the given formatter. Read more

impl<'r> FromRequest<'r> for Shutdown[src]

type Error = Infallible

The associated error to be returned if derivation fails.

fn from_request<'life0, 'async_trait>(
    request: &'r Request<'life0>
) -> Pin<Box<dyn Future<Output = Outcome<Self, Self::Error>> + Send + 'async_trait>> where
    'r: 'async_trait,
    'life0: 'async_trait,
    Self: 'async_trait, 
[src]

Derives an instance of Self from the incoming request metadata. Read more

impl Future for Shutdown[src]

type Output = ()

The type of value produced on completion.

fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>[src]

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

impl !RefUnwindSafe for Shutdown

impl Send for Shutdown

impl Sync for Shutdown

impl Unpin for Shutdown

impl !UnwindSafe for Shutdown

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized
[src]

pub fn type_id(&self) -> TypeId[src]

Gets the TypeId of self. Read more

impl<T> Borrow<T> for T where
    T: ?Sized
[src]

pub fn borrow(&self) -> &T[src]

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T where
    T: ?Sized
[src]

pub fn borrow_mut(&mut self) -> &mut T[src]

Mutably borrows from an owned value. Read more

impl<T> From<T> for T[src]

pub fn from(t: T) -> T[src]

Performs the conversion.

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

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

Map this future’s output to a different type, returning a new future of the resulting type. Read more

fn map_into<U>(self) -> MapInto<Self, U> where
    Self::Output: Into<U>, 

Map this future’s output to a different type, returning a new future of the resulting type. Read more

fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F> where
    F: FnOnce(Self::Output) -> Fut,
    Fut: Future

Chain on a computation for when a future finished, passing the result of the future to the provided closure f. Read more

fn left_future<B>(self) -> Either<Self, B> where
    B: Future<Output = Self::Output>, 

Wrap this future in an Either future, making it the left-hand variant of that Either. Read more

fn right_future<A>(self) -> Either<A, Self> where
    A: Future<Output = Self::Output>, 

Wrap this future in an Either future, making it the right-hand variant of that Either. Read more

fn into_stream(self) -> IntoStream<Self>

Convert this future into a single element stream. Read more

fn flatten(self) -> Flatten<Self> where
    Self::Output: Future

Flatten the execution of this future when the output of this future is itself another future. Read more

fn flatten_stream(self) -> FlattenStream<Self> where
    Self::Output: Stream, 

Flatten the execution of this future when the successful result of this future is a stream. Read more

fn fuse(self) -> Fuse<Self>

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

fn inspect<F>(self, f: F) -> Inspect<Self, F> where
    F: FnOnce(&Self::Output), 

Do something with the output of a future before passing it on. Read more

fn catch_unwind(self) -> CatchUnwind<Self> where
    Self: UnwindSafe

Catches unwinding panics while polling the future. Read more

fn shared(self) -> Shared<Self> where
    Self::Output: Clone

Create a cloneable handle to this future where all handles will resolve to the same result. Read more

fn remote_handle(self) -> (Remote<Self>, RemoteHandle<Self::Output>)

Turn this future into a future that yields () on completion and sends its output to another future on a separate task. Read more

fn boxed<'a>(
    self
) -> Pin<Box<dyn Future<Output = Self::Output> + 'a + Send, Global>> where
    Self: Send + 'a, 

Wrap the future in a Box, pinning it. Read more

fn boxed_local<'a>(
    self
) -> Pin<Box<dyn Future<Output = Self::Output> + 'a, Global>> where
    Self: 'a, 

Wrap the future in a Box, pinning it. Read more

fn unit_error(self) -> UnitError<Self>

fn never_error(self) -> NeverError<Self>

fn poll_unpin(&mut self, cx: &mut Context<'_>) -> Poll<Self::Output> where
    Self: Unpin

A convenience for calling Future::poll on Unpin future types.

fn now_or_never(self) -> Option<Self::Output>

Evaluates and consumes the future, returning the resulting output if the future is ready after the first call to Future::poll. Read more

impl<T> Instrument for T[src]

fn instrument(self, span: Span) -> Instrumented<Self>[src]

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

fn in_current_span(self) -> Instrumented<Self>[src]

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

impl<T, U> Into<U> for T where
    U: From<T>, 
[src]

pub fn into(self) -> U[src]

Performs the conversion.

impl<T> IntoCollection<T> for T

pub fn into_collection<A>(self) -> SmallVec<A> where
    A: Array<Item = T>, 

Converts self into a collection.

pub fn mapped<U, F, A>(self, f: F) -> SmallVec<A> where
    F: FnMut(T) -> U,
    A: Array<Item = U>, 

impl<F> IntoFuture for F where
    F: Future
[src]

type Output = <F as Future>::Output

🔬 This is a nightly-only experimental API. (into_future)

The output that the future will produce on completion.

type Future = F

🔬 This is a nightly-only experimental API. (into_future)

Which kind of future are we turning this into?

pub fn into_future(self) -> <F as IntoFuture>::Future[src]

🔬 This is a nightly-only experimental API. (into_future)

Creates a future from a value.

impl<T> Same<T> for T

type Output = T

Should always be Self

impl<T> ToOwned for T where
    T: Clone
[src]

type Owned = T

The resulting type after obtaining ownership.

pub fn to_owned(&self) -> T[src]

Creates owned data from borrowed data, usually by cloning. Read more

pub fn clone_into(&self, target: &mut T)[src]

🔬 This is a nightly-only experimental API. (toowned_clone_into)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
[src]

type Error = Infallible

The type returned in the event of a conversion error.

pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]

Performs the conversion.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

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

The type returned in the event of a conversion error.

pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>[src]

Performs the conversion.

impl<V, T> VZip<V> for T where
    V: MultiLane<T>, 

pub fn vzip(self) -> V