Struct tokio_codec::LinesCodec

[+] Show declaration

pub struct LinesCodec { /* fields omitted */ }

[−] Expand description

A simple Codec implementation that splits up data into lines.

Methods

impl LinesCodec

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pub fn new() -> LinesCodec

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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.

pub fn new_with_max_length(max_length: usize) -> Self

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Returns a LinesCodec with a maximum line length limit.

If this is set, calls to LinesCodec::decode will return a LengthError 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.

pub fn max_length(&self) -> usize

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Returns the maximum line length when decoding.

use std::usize;
use tokio_codec::LinesCodec;

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

use tokio_codec::LinesCodec;

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

Trait Implementations

impl PartialOrd<LinesCodec> for LinesCodec

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

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This method returns an ordering between self and other values if one exists.

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

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This method tests less than (for self and other) and is used by the < operator.

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

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This method tests less than or equal to (for self and other) and is used by the <= operator.

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

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This method tests greater than (for self and other) and is used by the > operator.

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

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This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Ord for LinesCodec

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

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This method returns an Ordering between self and other.

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

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Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

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Compares and returns the minimum of two values.

impl PartialEq<LinesCodec> for LinesCodec

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

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This method tests for self and other values to be equal, and is used by ==.

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

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This method tests for !=.

impl Clone for LinesCodec

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fn clone(&self) -> LinesCodec

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Returns a copy of the value.

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

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Performs copy-assignment from source.

impl Eq for LinesCodec

impl Hash for LinesCodec

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

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Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where     H: Hasher,

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Feeds a slice of this type into the given [Hasher].

impl Debug for LinesCodec

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

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Formats the value using the given formatter.

impl Decoder for LinesCodec

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type Item = String

The type of decoded frames.

type Error = Error

The type of unrecoverable frame decoding errors.

fn decode(&mut self, buf: &mut BytesMut) -> Result<Option<String>, Error>

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Attempts to decode a frame from the provided buffer of bytes.

fn decode_eof(&mut self, buf: &mut BytesMut) -> Result<Option<String>, Error>

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A default method available to be called when there are no more bytes available to be read from the underlying I/O.

fn framed<T>(self, io: T) -> Framed<T, Self> where     Self: Encoder,     T: AsyncRead + AsyncWrite,

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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.

impl Encoder for LinesCodec

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type Item = String

The type of items consumed by the Encoder

type Error = Error

The type of encoding errors.

fn encode(&mut self, line: String, buf: &mut BytesMut) -> Result<(), Error>

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Encodes a frame into the buffer provided.