Struct rocket::data::Data[][src]

pub struct Data<'r> { /* fields omitted */ }
Expand description

Type representing the body data of a request.

This type is the only means by which the body of a request can be retrieved. This type is not usually used directly. Instead, data guards (types that implement FromData) are created indirectly via code generation by specifying the data = "<var>" route parameter as follows:

#[post("/submit", data = "<var>")]
fn submit(var: DataGuard) { /* ... */ }

Above, DataGuard can be any type that implements FromData. Note that Data itself implements FromData.

Reading Data

Data may be read from a Data object by calling either the open() or peek() methods.

The open method consumes the Data object and returns the raw data stream. The Data object is consumed for safety reasons: consuming the object ensures that holding a Data object means that all of the data is available for reading.

The peek method returns a slice containing at most 512 bytes of buffered body data. This enables partially or fully reading from a Data object without consuming the Data object.

Implementations

impl<'r> Data<'r>[src]

pub fn open(self, limit: ByteUnit) -> DataStream<'r>[src]

Returns the raw data stream, limited to limit bytes.

The stream contains all of the data in the body of the request, including that in the peek buffer. The method consumes the Data instance. This ensures that a Data type always represents all of the data in a request.

Example

use rocket::data::{Data, ToByteUnit};

fn handler(data: Data<'_>) {
    let stream = data.open(2.mebibytes());
}

pub async fn peek(&mut self, num: usize) -> &[u8][src]

Retrieve at most num bytes from the peek buffer without consuming self.

The peek buffer contains at most 512 bytes of the body of the request. The actual size of the returned buffer is the max of the request’s body, num and 512. The peek_complete method can be used to determine if this buffer contains all of the data in the body of the request.

Examples

In a data guard:

use rocket::request::{self, Request, FromRequest};
use rocket::data::{Data, FromData, Outcome};

#[rocket::async_trait]
impl<'r> FromData<'r> for MyType {
    type Error = MyError;

    async fn from_data(r: &'r Request<'_>, mut data: Data<'r>) -> Outcome<'r, Self> {
        if data.peek(2).await != b"hi" {
            return Outcome::Forward(data)
        }

        /* .. */
    }
}

In a fairing:

use rocket::{Rocket, Request, Data, Response};
use rocket::fairing::{Fairing, Info, Kind};

#[rocket::async_trait]
impl Fairing for MyType {
    fn info(&self) -> Info {
        Info {
            name: "Data Peeker",
            kind: Kind::Request
        }
    }

    async fn on_request(&self, req: &mut Request<'_>, data: &mut Data<'_>) {
        if data.peek(2).await == b"hi" {
            /* do something; body data starts with `"hi"` */
        }

        /* .. */
    }
}

pub fn peek_complete(&self) -> bool[src]

Returns true if the peek buffer contains all of the data in the body of the request. Returns false if it does not or if it is not known if it does.

Example

use rocket::data::Data;

async fn handler(mut data: Data<'_>) {
    if data.peek_complete() {
        println!("All of the data: {:?}", data.peek(512).await);
    }
}

Trait Implementations

impl<'r> FromData<'r> for Data<'r>[src]

type Error = Infallible

The associated error to be returned when the guard fails.

fn from_data<'life0, 'async_trait>(
    __arg0: &'r Request<'life0>,
    data: Data<'r>
) -> Pin<Box<dyn Future<Output = Outcome<'r, Self>> + Send + 'async_trait>> where
    'r: 'async_trait,
    'life0: 'async_trait,
    Self: 'async_trait, 
[src]

Asynchronously validates, parses, and converts an instance of Self from the incoming request body data. Read more

impl<'r, S, E> IntoOutcome<S, (Status, E), Data<'r>> for Result<S, E>[src]

type Failure = Status

The type to use when returning an Outcome::Failure.

type Forward = Data<'r>

The type to use when returning an Outcome::Forward.

fn into_outcome(self, status: Status) -> Outcome<'r, S, E>[src]

Converts self into an Outcome. If self represents a success, an Outcome::Success is returned. Otherwise, an Outcome::Failure is returned with failure as the inner value. Read more

fn or_forward(self, data: Data<'r>) -> Outcome<'r, S, E>[src]

Converts self into an Outcome. If self represents a success, an Outcome::Success is returned. Otherwise, an Outcome::Forward is returned with forward as the inner value. Read more

Auto Trait Implementations

impl<'r> !RefUnwindSafe for Data<'r>

impl<'r> Send for Data<'r>

impl<'r> Sync for Data<'r>

impl<'r> Unpin for Data<'r>

impl<'r> !UnwindSafe for Data<'r>

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> 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<T> Same<T> for T

type Output = T

Should always be Self

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