Struct asynchronous_codec::LengthCodec

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pub struct LengthCodec;
Expand description

A simple Codec implementation sending your data by prefixing it by its length.

§Example

This codec will most likely be used wrapped in another codec like so.

use asynchronous_codec::{Decoder, Encoder, LengthCodec};
use bytes::{Bytes, BytesMut};
use std::io::{Error, ErrorKind};

pub struct MyStringCodec(LengthCodec);

impl Encoder for MyStringCodec {
    type Item = String;
    type Error = Error;

    fn encode(&mut self, src: Self::Item, dst: &mut BytesMut) -> Result<(), Self::Error> {
        let bytes = Bytes::from(src);
        self.0.encode(bytes, dst)
    }
}

impl Decoder for MyStringCodec {
    type Item = String;
    type Error = Error;

    fn decode(&mut self, src: &mut BytesMut) -> Result<Option<Self::Item>, Self::Error> {
        match self.0.decode(src)? {
            Some(bytes) => {
                match String::from_utf8(bytes.to_vec()) {
                    Ok(string) => Ok(Some(string)),
                    Err(e) => Err(Error::new(ErrorKind::InvalidData, e))
                }
            },
            None => Ok(None),
        }
    }
}

Trait Implementations§

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impl Decoder for LengthCodec

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type Item = Bytes

The type of items returned by decode
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type Error = Error

The type of decoding errors.
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fn decode( &mut self, src: &mut BytesMut, ) -> Result<Option<Self::Item>, Self::Error>

Decode an item from the src BytesMut into an item
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fn decode_eof( &mut self, src: &mut BytesMut, ) -> Result<Option<Self::Item>, Self::Error>

Called when the input stream reaches EOF, signaling a last attempt to decode Read more
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impl Encoder for LengthCodec

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type Item = Bytes

The type of items consumed by encode
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type Error = Error

The type of encoding errors.
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fn encode( &mut self, src: Self::Item, dst: &mut BytesMut, ) -> Result<(), Self::Error>

Encodes an item into the BytesMut provided by dst.

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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<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, 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.