Enum ResponseCode 

pub enum ResponseCode {
    Greeting(u16),
    Disconnect,
    AuthRequired(u16),
    AuthSuccess,
    MultilineData(u16),
    SingleLine(u16),
    Invalid,
}

Categorized NNTP response code for type-safe handling

This enum categorizes NNTP response codes based on their semantics and handling requirements per RFC 3977 §3.2.

Response Code Ranges

Per RFC 3977 §3.2.1:

• 1xx: Informational (multiline data follows)
• 2xx: Success (may be multiline)
• 3xx: Success so far, further input expected
• 4xx: Temporary failure
• 5xx: Permanent failure

Variants

Greeting(u16)

Server greeting - RFC 3977 §5.1

• 200: Posting allowed
• 201: No posting allowed

Disconnect

Disconnect/goodbye - RFC 3977 §5.4

• 205: Connection closing

AuthRequired(u16)

Authentication required - RFC 4643 §2.3

• 381: Password required
• 480: Authentication required

AuthSuccess

Authentication successful - RFC 4643 §2.5.1

• 281: Authentication accepted

MultilineData(u16)

Multiline data response Per RFC 3977 §3.4.1:

• All 1xx codes (100-199)
• Specific 2xx codes: 215, 220, 221, 222, 224, 225, 230, 231, 282

SingleLine(u16)

Single-line response (everything else)

Invalid

Invalid or unparseable response

Implementations

impl ResponseCode

pub fn parse(data: &[u8]) -> Self

Parse response data into a categorized response code

Per RFC 3977 §3.2, responses start with a 3-digit status code.

Optimization: Direct byte-to-digit conversion avoids UTF-8 overhead.

pub fn is_multiline(&self) -> bool

Check if this response type is multiline

Per RFC 3977 §3.4.1, multiline responses require special handling with terminator detection.

pub fn status_code(&self) -> Option<u16>

Get the numeric status code if available

pub fn is_success(&self) -> bool

Check if this is a success response (2xx or 3xx)

Per RFC 3977 §3.2.1:

• 2xx: Success
• 3xx: Success so far, send more input

Trait Implementations

impl Clone for ResponseCode

fn clone(&self) -> ResponseCode

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ResponseCode

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

Formats the value using the given formatter.

impl PartialEq for ResponseCode

fn eq(&self, other: &ResponseCode) -> 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 Copy for ResponseCode

impl Eq for ResponseCode

impl StructuralPartialEq for ResponseCode