Struct CompactReaction 

pub struct CompactReaction {
    pub id: [u8; 32],
    pub reference_id: [u8; 32],
    pub author_idx: u16,
    pub emoji: Box<str>,
    pub emoji_url: Option<Box<str>>,
}

Memory-efficient reaction with binary IDs and interned author.

Compared to the regular Reaction struct (~292 bytes with heap):

• IDs use [u8; 32] instead of hex String (saves ~56 bytes each)
• Author uses u16 index into interner (saves ~86 bytes)
• Emoji uses Box (saves 8 bytes, supports custom emoji like :cat_heart_eyes:)
• Total: ~82 bytes vs ~292 bytes (72% savings!)

Fields

id: [u8; 32]

Reaction event ID as binary

reference_id: [u8; 32]

Message being reacted to (binary event ID)

author_idx: u16

Author npub index (interned via NpubInterner)

emoji: Box<str>

Emoji string (supports standard emoji and custom like :cat_heart_eyes:)

emoji_url: Option<Box<str>>

NIP-30 custom-emoji URL when the reaction is :shortcode: form. Boxed so the cold path (stock unicode reactions) stays 8 bytes.

Implementations

impl CompactReaction

pub fn id_hex(&self) -> String

Get reaction ID as hex string

pub fn reference_id_hex(&self) -> String

Get reference ID as hex string

pub fn from_reaction(reaction: &Reaction, interner: &mut NpubInterner) -> Self

Convert from regular Reaction, interning author

pub fn from_reaction_owned( reaction: Reaction, interner: &mut NpubInterner, ) -> Self

Convert from regular Reaction (owned), interning author

pub fn to_reaction(&self, interner: &NpubInterner) -> Reaction

Convert back to regular Reaction, resolving author from interner

Trait Implementations

impl Clone for CompactReaction

fn clone(&self) -> CompactReaction

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CompactReaction

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

Formats the value using the given formatter.

impl DeepSize for CompactReaction

fn deep_size(&self) -> usize