Struct CompactReaction 

pub struct CompactReaction {
    pub 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

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 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, parent_id: &[u8; 32], interner: &NpubInterner, ) -> Reaction

Convert back to regular Reaction, resolving author from interner. parent_id is the reacted-to message’s binary event id: a CompactReaction is always nested inside that message, so its id IS the reference (the field used to be stored redundantly on every reaction).

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