Struct tokio_util::codec::LinesCodec

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pub struct LinesCodec { /* private fields */ }
Available on crate feature codec only.
Expand description

A simple Decoder and Encoder implementation that splits up data into lines.

This uses the \n character as the line ending on all platforms.

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impl LinesCodec

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pub fn new() -> LinesCodec

Returns a LinesCodec for splitting up data into lines.

§Note

The returned LinesCodec will not have an upper bound on the length of a buffered line. See the documentation for new_with_max_length for information on why this could be a potential security risk.

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pub fn new_with_max_length(max_length: usize) -> Self

Returns a LinesCodec with a maximum line length limit.

If this is set, calls to LinesCodec::decode will return a LinesCodecError when a line exceeds the length limit. Subsequent calls will discard up to limit bytes from that line until a newline character is reached, returning None until the line over the limit has been fully discarded. After that point, calls to decode will function as normal.

§Note

Setting a length limit is highly recommended for any LinesCodec which will be exposed to untrusted input. Otherwise, the size of the buffer that holds the line currently being read is unbounded. An attacker could exploit this unbounded buffer by sending an unbounded amount of input without any \n characters, causing unbounded memory consumption.

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pub fn max_length(&self) -> usize

Returns the maximum line length when decoding.

use std::usize;
use tokio_util::codec::LinesCodec;

let codec = LinesCodec::new();
assert_eq!(codec.max_length(), usize::MAX);
use tokio_util::codec::LinesCodec;

let codec = LinesCodec::new_with_max_length(256);
assert_eq!(codec.max_length(), 256);

Trait Implementations§

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impl Clone for LinesCodec

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fn clone(&self) -> LinesCodec

Returns a copy of the value. Read more
1.0.0 · source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for LinesCodec

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

Formats the value using the given formatter. Read more
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impl Decoder for LinesCodec

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type Item = String

The type of decoded frames.
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type Error = LinesCodecError

The type of unrecoverable frame decoding errors. Read more
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fn decode( &mut self, buf: &mut BytesMut, ) -> Result<Option<String>, LinesCodecError>

Attempts to decode a frame from the provided buffer of bytes. Read more
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fn decode_eof( &mut self, buf: &mut BytesMut, ) -> Result<Option<String>, LinesCodecError>

A default method available to be called when there are no more bytes available to be read from the underlying I/O. Read more
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fn framed<T: AsyncRead + AsyncWrite + Sized>(self, io: T) -> Framed<T, Self>
where Self: Sized,

Provides a Stream and Sink interface for reading and writing to this Io object, using Decode and Encode to read and write the raw data. Read more
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impl Default for LinesCodec

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl<T> Encoder<T> for LinesCodec
where T: AsRef<str>,

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type Error = LinesCodecError

The type of encoding errors. Read more
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fn encode(&mut self, line: T, buf: &mut BytesMut) -> Result<(), LinesCodecError>

Encodes a frame into the buffer provided. Read more
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impl Hash for LinesCodec

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl Ord for LinesCodec

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fn cmp(&self, other: &LinesCodec) -> Ordering

This method returns an Ordering between self and other. Read more
1.21.0 · source§

fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
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impl PartialEq for LinesCodec

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fn eq(&self, other: &LinesCodec) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl PartialOrd for LinesCodec

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fn partial_cmp(&self, other: &LinesCodec) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl Eq for LinesCodec

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impl StructuralPartialEq for LinesCodec

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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> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. 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> Instrument for T

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

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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where U: From<T>,

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Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

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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

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