Enum Reply 

pub enum Reply {
    Simple(Vec<u8>),
    Error(Vec<u8>),
    Int(i64),
    Bulk(Vec<u8>),
    Nil,
    Array(Vec<Reply>),
    Map(Vec<(Reply, Reply)>),
    Set(Vec<Reply>),
    Double(f64),
    Boolean(bool),
    Verbatim {
        fmt: [u8; 3],
        data: Vec<u8>,
    },
    BigNumber(Vec<u8>),
    Null,
    Push(Vec<Reply>),
    BlobError(Vec<u8>),
}

A parsed RESP reply (server → client) — the client-side counterpart of the crate’s encode_* functions (server-side encoders).

Variants prefixed with Resp3: in their doc are only ever produced by a server speaking RESP3; an HELLO 2 (or no HELLO) session sees the RESP2 subset (Simple / Error / Int / Bulk / Nil / Array) exclusively. Adding new variants is non-breaking: an exhaustive match on Reply is forced to opt into RESP3 by listing each variant (rust 2024 will not warn on missing arms only after #[non_exhaustive] — which we deliberately omit so RESP2-only code stays compile-checked for completeness).

Variants

Simple(Vec<u8>)

+OK

Error(Vec<u8>)

-ERR ...

Int(i64)

:42

Bulk(Vec<u8>)

$5\r\nhello\r\n

Nil

$-1 or *-1 — the RESP2 null sentinel; in RESP3 the dedicated Reply::Null (_\r\n) is used instead. Both round-trip here.

Array(Vec<Reply>)

*N ...

Map(Vec<(Reply, Reply)>)

Resp3: %N\r\n<key1><value1>...<keyN><valueN> — N pairs (the header count is the pair count, NOT the element count, so a map of 3 pairs is %3 plus 6 sub-replies). Parsed/exposed as a Vec of pairs so duplicate keys + insertion order are preserved.

Set(Vec<Reply>)

Resp3: ~N\r\n<item1>...<itemN> — set semantics on the wire; dedup is the application’s job (RESP3 doesn’t require it).

Double(f64)

Resp3: ,1.5\r\n — double. inf / -inf / nan are valid payloads per the RESP3 spec and survive the round-trip.

Boolean(bool)

Resp3: #t\r\n / #f\r\n — boolean.

Verbatim

Resp3: =15\r\ntxt:Some bytes\r\n — verbatim string carrying a 3-char format tag (txt / mkd / etc.) + raw bytes. The colon separator is part of the wire encoding but not part of data.

Fields

fmt: [u8; 3]

3-char format tag (e.g. b"txt" for plain text, b"mkd" for markdown).

data: Vec<u8>

Payload bytes following the : separator.

BigNumber(Vec<u8>)

Resp3: (170141183460469231731687303715884105727\r\n — arbitrary- precision integer; carried as the raw digit bytes since we don’t pull in a bignum crate (charter: zero deps).

Null

Resp3: _\r\n — true null. RESP2 falls back to Reply::Nil.

Push(Vec<Reply>)

Resp3: >N\r\n... — like Reply::Array but tagged as an out-of-band server-push frame (pub/sub messages in RESP3). The client must dispatch these separately from regular replies.

BlobError(Vec<u8>)

Resp3: !8\r\nERR ohno\r\n — error carried as a length-prefixed bulk (handles errors containing CRLF that the simple-string - shape can’t encode).

Trait Implementations

impl Clone for Reply

fn clone(&self) -> Reply

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Reply

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

Formats the value using the given formatter.

impl PartialEq for Reply

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl StructuralPartialEq for Reply