antegen_thread_program/instructions/
fiber_swap.rs

1use crate::{errors::AntegenThreadError, *};
2use anchor_lang::prelude::*;
3
4/// Accounts required by the `swap_fiber` instruction.
5/// Copies source fiber's instruction into target, closes source.
6/// Validates authority, CPIs to Fiber Program to swap, updates thread fiber tracking.
7#[derive(Accounts)]
8#[instruction(source_fiber_index: u8)]
9pub struct FiberSwap<'info> {
10    /// The authority of the thread or the thread itself
11    #[account(
12        constraint = authority.key().eq(&thread.authority) || authority.key().eq(&thread.key())
13    )]
14    pub authority: Signer<'info>,
15
16    /// The thread that owns both fibers
17    #[account(
18        mut,
19        constraint = thread.fiber_ids.contains(&source_fiber_index) @ AntegenThreadError::InvalidFiberIndex,
20        seeds = [
21            SEED_THREAD,
22            thread.authority.as_ref(),
23            thread.id.as_slice(),
24        ],
25        bump = thread.bump,
26    )]
27    pub thread: Account<'info, Thread>,
28
29    /// CHECK: target fiber — receives source's instruction content.
30    /// Shape-agnostic; fiber program validates the `thread` field.
31    #[account(mut)]
32    pub target: UncheckedAccount<'info>,
33
34    /// CHECK: source fiber — closed after its instruction is copied to target.
35    /// Shape-agnostic; fiber program validates the `thread` field.
36    #[account(mut)]
37    pub source: UncheckedAccount<'info>,
38
39    /// The Fiber Program for CPI
40    pub fiber_program: Program<'info, antegen_fiber_program::program::AntegenFiber>,
41}
42
43pub fn fiber_swap(ctx: Context<FiberSwap>, source_fiber_index: u8) -> Result<()> {
44    let thread = &mut ctx.accounts.thread;
45
46    // CPI to Fiber Program's swap_fiber
47    thread.sign(|seeds| {
48        antegen_fiber_program::cpi::swap(CpiContext::new_with_signer(
49            ctx.accounts.fiber_program.key(),
50            antegen_fiber_program::cpi::accounts::Swap {
51                thread: thread.to_account_info(),
52                target: ctx.accounts.target.to_account_info(),
53                source: ctx.accounts.source.to_account_info(),
54            },
55            &[seeds],
56        ))
57    })?;
58
59    // Remove source fiber index from fiber_ids
60    thread.fiber_ids.retain(|&x| x != source_fiber_index);
61
62    // Adjust cursor if it was pointing to the removed source
63    if thread.fiber_cursor == source_fiber_index {
64        if thread.fiber_ids.is_empty() {
65            thread.fiber_cursor = 0;
66        } else {
67            thread.fiber_cursor = thread.fiber_ids[0];
68        }
69    }
70
71    Ok(())
72}
antegen_thread_program/instructions/fiber_swap.rs

antegen_thread_program/instructions/
fiber_swap.rs
