Enum redis_protocol::resp3::types::Frame

pub enum Frame {
    BlobString {
        data: Bytes,
        attributes: Option<Attributes>,
    },
    BlobError {
        data: Bytes,
        attributes: Option<Attributes>,
    },
    SimpleString {
        data: Bytes,
        attributes: Option<Attributes>,
    },
    SimpleError {
        data: Str,
        attributes: Option<Attributes>,
    },
    Boolean {
        data: bool,
        attributes: Option<Attributes>,
    },
    Null,
    Number {
        data: i64,
        attributes: Option<Attributes>,
    },
    Double {
        data: f64,
        attributes: Option<Attributes>,
    },
    BigNumber {
        data: Bytes,
        attributes: Option<Attributes>,
    },
    VerbatimString {
        data: Bytes,
        format: VerbatimStringFormat,
        attributes: Option<Attributes>,
    },
    Array {
        data: Vec<Frame>,
        attributes: Option<Attributes>,
    },
    Map {
        data: FrameMap,
        attributes: Option<Attributes>,
    },
    Set {
        data: FrameSet,
        attributes: Option<Attributes>,
    },
    Push {
        data: Vec<Frame>,
        attributes: Option<Attributes>,
    },
    Hello {
        version: RespVersion,
        auth: Option<Auth>,
    },
    ChunkedString(Bytes),
}

An enum describing the possible data types in RESP3 along with the corresponding Rust data type to represent the payload.

https://github.com/antirez/RESP3/blob/master/spec.md

Variants

BlobString

Fields

data: Bytes

attributes: Option<Attributes>

A binary-safe blob.

BlobError

Fields

data: Bytes

attributes: Option<Attributes>

A binary-safe blob representing an error.

SimpleString

Fields

data: Bytes

attributes: Option<Attributes>

A small non binary-safe string.

The internal data type is Bytes in order to support callers that use this interface to parse a MONITOR stream.

SimpleError

Fields

data: Str

attributes: Option<Attributes>

A small non binary-safe string representing an error.

Boolean

Fields

data: bool

attributes: Option<Attributes>

A boolean type.

Null

A null type.

Number

Fields

data: i64

attributes: Option<Attributes>

A signed 64 bit integer.

Double

Fields

data: f64

attributes: Option<Attributes>

A signed 64 bit floating point number.

BigNumber

Fields

data: Bytes

attributes: Option<Attributes>

A large number not representable as a Number or Double.

This library does not attempt to parse this, nor does it offer any utilities to do so.

VerbatimString

Fields

data: Bytes

format: VerbatimStringFormat

attributes: Option<Attributes>

A binary-safe string to be displayed without any escaping or filtering.

Array

Fields

data: Vec<Frame>

attributes: Option<Attributes>

An array of frames, arbitrarily nested.

Map

Fields

data: FrameMap

attributes: Option<Attributes>

An unordered map of key-value pairs.

According to the spec keys can be any other RESP3 data type. However, it doesn’t make sense to implement Hash for certain Rust data types like HashMap, Vec, HashSet, etc, so this library limits the possible data types for keys to only those that can be hashed in a semi-sane way.

For example, attempting to create a Frame::Map<HashMap<Frame::Set<HashSet<Frame>>, Frame::Foo>> from bytes will panic.

Set

Fields

data: FrameSet

attributes: Option<Attributes>

An unordered collection of other frames with a uniqueness constraint.

Push

Fields

data: Vec<Frame>

attributes: Option<Attributes>

Out-of-band data to be returned to the caller if necessary.

Hello

Fields

version: RespVersion

auth: Option<Auth>

A special frame type used when first connecting to the server to describe the protocol version and optional credentials.

ChunkedString(Bytes)

One chunk of a streaming string.

Implementations

impl Frame

pub fn can_hash(&self) -> bool

Whether or not the frame can be used as a key in a HashMap or HashSet.

Not all frame types can be hashed, and trying to do so can panic. This function can be used to handle this gracefully.

pub fn attributes(&self) -> Option<&Attributes>

Read the attributes attached to the frame.

pub fn take_attributes(&mut self) -> Option<Attributes>

Take the attributes off this frame.

pub fn attributes_mut(&mut self) -> Option<&mut Attributes>

Read a mutable reference to any attributes attached to the frame.

pub fn add_attributes(
    &mut self,
    attributes: Attributes
) -> Result<(), RedisProtocolError>

Attempt to add attributes to the frame, extending the existing attributes if needed.

pub fn new_end_stream() -> Self

Create a new Frame that terminates a stream.

pub fn len(&self) -> usize

A context-aware length function that returns the length of the inner frame contents.

This does not return the encoded length, but rather the length of the contents of the frame such as the number of elements in an array, the size of any inner buffers, etc.

Note: Null has a length of 0 and Hello, Number, Double, and Boolean have a length of 1.

See encode_len to read the number of bytes necessary to encode the frame.

pub fn take(&mut self) -> Frame

Replace self with Null, returning the original value.

pub fn kind(&self) -> FrameKind

Read the associated FrameKind.

pub fn is_null(&self) -> bool

Whether or not the frame is a Null variant.

pub fn is_array(&self) -> bool

Whether or not the frame represents an array of frames.

pub fn is_push(&self) -> bool

Whether or not the frame represents data pushed to the client from the server.

pub fn is_boolean(&self) -> bool

Whether or not the frame is a boolean value.

pub fn is_error(&self) -> bool

Whether or not the frame represents an error.

pub fn is_aggregate_type(&self) -> bool

Whether or not the frame is an array, map, or set.

pub fn is_blob(&self) -> bool

Whether or not the frame represents a BlobString or BlobError.

pub fn is_chunked_string(&self) -> bool

Whether or not the frame represents a chunked string.

pub fn is_end_stream_frame(&self) -> bool

Whether or not the frame is an empty chunked string, signifying the end of a chunked string stream.

pub fn is_verbatim_string(&self) -> bool

Whether or not the frame is a verbatim string.

pub fn verbatim_string_format(&self) -> Option<&VerbatimStringFormat>

If the frame is a verbatim string then read the associated format.

pub fn as_str(&self) -> Option<&str>

Read the frame as a string slice if it can be parsed as a UTF-8 string without allocating.

Numbers and Doubles will not be cast to a string since that would require allocating.

pub fn to_string(&self) -> Option<String>

Read the frame as a String if it can be parsed as a UTF-8 string.

pub fn as_bytes(&self) -> Option<&[u8]>

Attempt to read the frame as a byte slice.

pub fn as_i64(&self) -> Option<i64>

Attempt to read the frame as an i64.

pub fn as_f64(&self) -> Option<f64>

Attempt to read the frame as an f64.

pub fn is_moved_or_ask_error(&self) -> bool

Whether or not the frame represents a MOVED or ASK error.

pub fn to_redirection(&self) -> Option<Redirection>

Attempt to parse the frame as a cluster redirection error.

pub fn is_normal_pubsub(&self) -> bool

Whether or not the frame represents a publish-subscribe message, but not a pattern publish-subscribe message.

pub fn is_pubsub_message(&self) -> bool

Whether or not the frame represents a message on a publish-subscribe channel.

pub fn is_pattern_pubsub_message(&self) -> bool

Whether or not the frame represents a message on a publish-subscribe channel matched against a pattern subscription.

pub fn parse_as_pubsub(self) -> Result<(Frame, Frame), Self>

Attempt to parse the frame as a publish-subscribe message, returning the (channel, message) tuple if successful, or the original frame if the inner data is not a publish-subscribe message.

pub fn encode_len(&self) -> Result<usize, RedisProtocolError>

Attempt to read the number of bytes needed to encode the frame.

Trait Implementations

impl Clone for Frame

fn clone(&self) -> Frame

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Frame

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

Formats the value using the given formatter.

impl From<bool> for Frame

fn from(value: bool) -> Self

Converts to this type from the input type.

impl From<i64> for Frame

fn from(value: i64) -> Self

Converts to this type from the input type.

impl Hash for Frame

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

Feeds this value into the given Hasher.

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

Feeds a slice of this type into the given Hasher.

impl PartialEq<Frame> for Frame

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

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

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

This method tests for !=.

impl TryFrom<HashMap<Frame, Frame, RandomState>> for Frame

type Error = RedisProtocolError

The type returned in the event of a conversion error.

fn try_from(value: HashMap<Frame, Frame>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<HashSet<Frame, RandomState>> for Frame

type Error = RedisProtocolError

The type returned in the event of a conversion error.

fn try_from(value: HashSet<Frame>) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<f64> for Frame

type Error = RedisProtocolError

The type returned in the event of a conversion error.

fn try_from(value: f64) -> Result<Self, Self::Error>

Performs the conversion.

impl Eq for Frame