pub struct BufferHandler<'a, const N: usize>(/* private fields */);
Expand description

CoAP handler for reading from a Buffer

This implements a variant of the proposed stdio handling. It deviates in some details, in particular:

  • It uses CBOR streams rather than a response array, and no array pairs.
  • It always sends offset and a single data item (effecively leaving it open whether the pattern would be continued [5, "hello ", 11, "world"] or [5, "hello ", "world"]).
  • GET always reports the oldest available data (that’s probably underspecified in the original proposal)
  • GETs return immediately.
  • FETCH only takes a single integer: where to start.
  • No paired channel.

Implementations§

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impl<'a, const N: usize> BufferHandler<'a, N>

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pub fn new(buffer: &'a Buffer<N>) -> Self

Construct a handler for a buffer

This adds nothing to the buffer other than the selection of the CoAP serialization; if it were not for separation of concerns, the coap_handler implementation could just as well be on the buffer itself.

Trait Implementations§

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impl<'a, const N: usize> Handler for BufferHandler<'a, N>

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type RequestData = RequestedScrollbufPosition

Type constructed in extract_request_data() passed on to build_response(). Read more
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type ExtractRequestError = Error

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type BuildResponseError<M: MinimalWritableMessage> = BuildResponseError<<M as MinimalWritableMessage>::UnionError>

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fn extract_request_data<M: ReadableMessage>( &mut self, req: &M ) -> Result<RequestedScrollbufPosition, Error>

Process an incoming request. Read more
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fn estimate_length(&mut self, _: &<Self as Handler>::RequestData) -> usize

Estimate an upper bound for the number of bytes in the response Read more
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fn build_response<M: MutableWritableMessage>( &mut self, res: &mut M, mode: RequestedScrollbufPosition ) -> Result<(), Self::BuildResponseError<M>>

Build a response for the request Read more
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impl<'a, const N: usize> Reporting for BufferHandler<'a, N>

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type Record<'b> = BufferHandlerRecord where Self: 'b

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type Reporter<'b> = Once<BufferHandlerRecord> where Self: 'b

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fn report(&self) -> Self::Reporter<'_>

Auto Trait Implementations§

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impl<'a, const N: usize> !RefUnwindSafe for BufferHandler<'a, N>

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impl<'a, const N: usize> Send for BufferHandler<'a, N>

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impl<'a, const N: usize> Sync for BufferHandler<'a, N>

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impl<'a, const N: usize> Unpin for BufferHandler<'a, N>

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impl<'a, const N: usize> !UnwindSafe for BufferHandler<'a, N>

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> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<'a, OldRD, OldH> HandlerBuilder<'a, OldRD> for OldH
where OldH: Handler<RequestData = OldRD>,

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fn at<H>(self, path: &'a [&'a str], handler: H) -> ForkingHandler<'a, H, Self>
where H: Handler,

Divert requests arriving at path into the given handler. Read more
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fn at_with_attributes<H>( self, path: &'a [&'a str], attributes: &'a [Attribute], handler: H ) -> ForkingHandler<'a, ConstantSingleRecordReport<'a, H>, Self>
where H: Handler,

Divert requests arriving at path into the given handler, and announce them with the given attributes in .well-known/core. Read more
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fn below<H>( self, path: &'a [&'a str], handler: H ) -> ForkingTreeHandler<'a, H, Self>

Divert requests arriving with an Uri-Path starting with path to the given handler. 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<'a, OldRD, OldH> ReportingHandlerBuilder<'a, OldRD> for OldH
where OldH: Handler<RequestData = OldRD> + Reporting,

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fn with_wkc(self) -> WellKnownCore<Self>

Add a /.well-known/core resource that exposes the information the previous (stack of) handler(s) exposes throught the Reporting trait.
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impl<T> Same for T

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type Output = T

Should always be Self
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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.