Struct rocket::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

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());
}

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 min 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"` */
        }

        /* .. */
    }
}

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

The associated error to be returned when the guard fails.

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

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

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

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

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

Blanket Implementations

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Performs the conversion.

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

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Pipes by value. This is generally the method you want to use. Read more

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Calls .tap() only in debug builds, and is erased in release builds.

Calls .tap_mut() only in debug builds, and is erased in release builds. Read more

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Calls .tap_borrow_mut() only in debug builds, and is erased in release builds. Read more

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Calls .tap_deref_mut() only in debug builds, and is erased in release builds. Read more

Provides immutable access for inspection. Read more

Calls tap in debug builds, and does nothing in release builds.

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Calls tap_mut in debug builds, and does nothing in release builds.

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Provides mutable access to the reference for modification.

Calls tap_ref_mut in debug builds, and does nothing in release builds.

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Calls tap_borrow in debug builds, and does nothing in release builds.

Provides mutable access to the borrow for modification.

Calls tap_borrow_mut in debug builds, and does nothing in release builds. Read more

Immutably dereferences self for inspection.

Calls tap_deref in debug builds, and does nothing in release builds.

Mutably dereferences self for modification.

Calls tap_deref_mut in debug builds, and does nothing in release builds. Read more

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The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.