安装

在您的项目目录中运行以下 Cargo 命令：

cargo add switchboard-solana

或添加以下行到您的 Cargo.toml 文件中

[dependencies]
switchboard-solana = "0.29"

注意：次要版本对应于 anchor-lang 依赖。此包的版本 0.29.* 使用 anchor-lang 0.29.0，而版本 0.27.* 使用 anchor-lang 0.27.0。我们目前支持 Anchor 29、28 和 27。

账户

此 SDK 为 Oracle 程序提供以下账户定义：

• OracleQueue
• Crank
• Oracle
• Permission
• Aggregator
• Job
• Lease
• Vrf
• VrfLite
• VrfPool

此 SDK 为 Attestation 程序提供以下账户定义：

• AttestationQueue
• Verifier
• AttestationPermission
• SwitchboardWallet
• Function
• FunctionRequest

Usage

Functions

在允许您的程序修改其状态之前，您需要验证您函数的 enclave_signer。

use switchboard_solana::FunctionAccountData;

#[derive(Accounts)]
pub struct SaveDataInstruction<'info> {
    // ... your required accounts to modify your program's state

    // We use this to derive and verify the functions enclave state
    #[account(
        constraint =
            function.load()?.validate(
              &enclave_signer.to_account_info()
            )?
    )]
    pub function: AccountLoader<'info, FunctionAccountData>,
    pub enclave_signer: Signer<'info>,
}

Aggregator

读取最新结果

use anchor_lang::solana_program::clock;
use std::convert::TryInto;
use switchboard_solana::{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))?;

读取聚合器历史记录

注意：在使用之前，聚合器必须初始化历史缓冲区。

use switchboard_solana::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 账户

读取 VRF 结果

use switchboard_solana::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;

请求随机性 CPI

pub use switchboard_solana::{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,
)?;