呼rust cpi
three lines, one struct, one cpi. this is the entire kagura integration surface for an anchor consumer.
1. cargo dep
1[dependencies]2anchor-lang = "0.31.1"3kagura-core = { path = "../kagura-core", features = ["cpi"] }2. account struct
Add three accounts to your instruction's account struct: kagura's config, your registered protocol, and the kagura-core program.
1use anchor_lang::prelude::*;2use kagura_core::cpi::accounts::RecordTick;3use kagura_core::program::KaguraCore;4 5#[derive(Accounts)]6pub struct YourTick<'info> {7 pub authority: Signer<'info>,8 9 /// CHECK: kagura-core config pda; verified by kagura-core's own constraints.10 #[account(mut)]11 pub kagura_config: UncheckedAccount<'info>,12 13 /// CHECK: kagura-core protocol registration pda; verified by stored pubkey on your state.14 #[account(mut, address = your_state.kagura_protocol)]15 pub kagura_protocol: UncheckedAccount<'info>,16 17 pub kagura_core_program: Program<'info, KaguraCore>,18 19 // ... your own accounts20}3. the cpi
1pub fn handler(ctx: Context<YourTick>) -> Result<()> {2 // ─── ask kagura-core how much wall-clock time has passed ───3 let cpi_accounts = RecordTick {4 authority: ctx.accounts.authority.to_account_info(),5 config: ctx.accounts.kagura_config.to_account_info(),6 protocol: ctx.accounts.kagura_protocol.to_account_info(),7 };8 let cpi_ctx = CpiContext::new(9 ctx.accounts.kagura_core_program.to_account_info(),10 cpi_accounts,11 );12 let tick = kagura_core::cpi::record_tick(cpi_ctx)?.get();13 14 // ─── now use tick.elapsed_ms in your math ───15 msg!("kagura tick #{} elapsed={}ms",16 tick.tick_number, tick.elapsed_ms);17 18 // ... your protocol-specific logic, parameterized by elapsed_ms19 Ok(())20}who signs
kagura-core requires that the signer of record_tick equals the protocol authority recorded at register_protocol time. Two patterns cover most integrations:
a) shared authority (simplest)
Your program and kagura-core register against the same wallet. The wallet signs every tick. This is what kagura-vault does.
1// your program2#[derive(Accounts)]3pub struct YourTick<'info> {4 pub authority: Signer<'info>, // <-- this is the kagura authority too5 // ...6}b) program pda as authority
Register kagura-core with your program's pda as authority. Then ticks sign with seeds. Useful when ticks are permissionless (anyone calls your instruction; your pda signs the inner cpi).
1let bump = ctx.accounts.your_state.bump;2let signer_seeds: &[&[u8]] = &[3 b"your-state",4 &[bump],5];6let cpi_ctx = CpiContext::new_with_signer(7 ctx.accounts.kagura_core_program.to_account_info(),8 cpi_accounts,9 &[signer_seeds],10);11let tick = kagura_core::cpi::record_tick(cpi_ctx)?.get();pre-registration
Before your program can tick, the chosen authority must call kagura-core register_protocol once. Easiest: do it from a script.
1import * as anchor from "@coral-xyz/anchor";2import { Program, BN } from "@coral-xyz/anchor";3import { PublicKey } from "@solana/web3.js";4import { KaguraCore } from "../target/types/kagura_core";5 6const PROTOCOL_SEED = Buffer.from("kagura-protocol");7const CONFIG_SEED = Buffer.from("kagura-config");8 9const provider = anchor.AnchorProvider.env();10anchor.setProvider(provider);11 12const core = anchor.workspace.kaguraCore as Program<KaguraCore>;13const wallet = (provider.wallet as anchor.Wallet).payer;14 15const [config] = PublicKey.findProgramAddressSync([CONFIG_SEED], core.programId);16const [protocol] = PublicKey.findProgramAddressSync(17 [PROTOCOL_SEED, wallet.publicKey.toBuffer()],18 core.programId,19);20 21await core.methods22 .registerProtocol("your-protocol-name", 1000) // 1s tick floor for vanilla solana23 .accounts({24 authority: wallet.publicKey,25 config,26 protocol,27 systemProgram: anchor.web3.SystemProgram.programId,28 })29 .rpc();error translation
Errors thrown by kagura-core during cpi are propagated to your program with their original error code. To handle them gracefully:
1match kagura_core::cpi::record_tick(cpi_ctx) {2 Ok(res) => {3 let tick = res.get();4 // happy path5 }6 Err(err) => {7 // err is an anchor Error wrapping the kagura-core error code8 msg!("kagura tick failed: {:?}", err);9 return Err(YourError::TickFailed.into());10 }11}example: kagura-vault
kagura-vault is the canonical consumer. Read programs/kagura-vault/src/instructions/tick_funding.rs for a production cpi pattern with token transfers, signer seeds for token authority pdas, and event emission.