switchboard-v2

A Rust library to interact with Switchboard V2 accounts.

This package can be used to interact and deserialize Switchboard V2 accounts.

See the documentation for more info on Switchboard.

Features

By default the crate will default to mainnet. You must explicitly enable the devnet feature to use on devnet.

Usage

Aggregator

Read Latest Result

use anchor_lang::solana_program::clock;
use std::convert::TryInto;
use switchboard_v2::{AggregatorAccountData, SwitchboardDecimal, SWITCHBOARD_PROGRAM_ID};

// check feed owner
let owner = *aggregator.owner;
if owner != SWITCHBOARD_PROGRAM_ID {
    return Err(error!(ErrorCode::InvalidSwitchboardAccount));
}

// deserialize account info
let feed = ctx.accounts.aggregator.load()?;
// OR
let feed = AggregatorAccountData::new(feed_account_info)?;

// get result
let decimal: f64 = feed.get_result()?.try_into()?;

// check if feed has been updated in the last 5 minutes
feed.check_staleness(clock::Clock::get().unwrap().unix_timestamp, 300)?;

// check if feed exceeds a confidence interval of +/i $0.80
feed.check_confidence_interval(SwitchboardDecimal::from_f64(0.80))?;

Example(s): anchor-feed-parser, native-feed-parser

Read Aggregator History

Note: The Aggregator must have a history buffer initialized before using

use switchboard_v2::AggregatorHistoryBuffer;
use std::convert::TryInto;

let history_buffer = AggregatorHistoryBuffer::new(history_account_info)?;
let current_timestamp = Clock::get()?.unix_timestamp;
let one_hour_ago: f64 = history_buffer.lower_bound(current_timestamp - 3600).unwrap().try_into()?;

VRF Account

Read Latest Result

use switchboard_v2::VrfAccountData;

// deserialize the account info
let vrf = ctx.accounts.vrf.load()?;
// OR
let vrf = VrfAccountData::new(vrf_account_info)?;

// read the result
let result_buffer = vrf.get_result()?;
let value: &[u128] = bytemuck::cast_slice(&result_buffer[..]);
let result = value[0] % 256000 as u128;

Example: anchor-vrf-parser

RequestRandomness CPI

pub use switchboard_v2::{VrfAccountData, VrfRequestRandomness};

let switchboard_program = ctx.accounts.switchboard_program.to_account_info();

let vrf_request_randomness = VrfRequestRandomness {
    authority: ctx.accounts.state.to_account_info(),
    vrf: ctx.accounts.vrf.to_account_info(),
    oracle_queue: ctx.accounts.oracle_queue.to_account_info(),
    queue_authority: ctx.accounts.queue_authority.to_account_info(),
    data_buffer: ctx.accounts.data_buffer.to_account_info(),
    permission: ctx.accounts.permission.to_account_info(),
    escrow: ctx.accounts.escrow.clone(),
    payer_wallet: ctx.accounts.payer_wallet.clone(),
    payer_authority: ctx.accounts.payer_authority.to_account_info(),
    recent_blockhashes: ctx.accounts.recent_blockhashes.to_account_info(),
    program_state: ctx.accounts.program_state.to_account_info(),
    token_program: ctx.accounts.token_program.to_account_info(),
};

let vrf_key = ctx.accounts.vrf.key.clone();
let authority_key = ctx.accounts.authority.key.clone();

let state_seeds: &[&[&[u8]]] = &[&[
    &STATE_SEED,
    vrf_key.as_ref(),
    authority_key.as_ref(),
    &[bump],
]];
msg!("requesting randomness");
vrf_request_randomness.invoke_signed(
    switchboard_program,
    params.switchboard_state_bump,
    params.permission_bump,
    state_seeds,
)?;

Example: anchor-vrf-parser

Buffer Relayer Account

Read Latest Result

use anchor_lang::solana_program::clock;
use std::convert::TryInto;
use switchboard_v2::{BufferRelayerAccountData, SWITCHBOARD_PROGRAM_ID};

// check feed owner
let owner = *aggregator.owner;
if owner != SWITCHBOARD_PROGRAM_ID {
    return Err(error!(ErrorCode::InvalidSwitchboardAccount));
}

// deserialize account info
let buffer = BufferRelayerAccountData::new(feed_account_info)?;

// get result
let buffer_result = buffer.get_result();

// check if feed has been updated in the last 5 minutes
buffer.check_staleness(clock::Clock::get().unwrap().unix_timestamp, 300)?;

// convert buffer to a string
let result_string = String::from_utf8(buffer.result)
    .map_err(|_| error!(ErrorCode::StringConversionFailed))?;
msg!("Buffer string {:?}!", result_string);

Example: anchor-buffer-parser