balancer_sdk 0.1.16-alpha

//! This is a collection of examples for interacting with each of the Base Vault API methods.
//! Each method is run in main() below -- you can comment out whichever example you don't want
//! to run.
//!
//! The examples use the RPC_URL constant, but you can/should replace that with your own.
//! Since the Base Pool contract is inherited by all of the other pools, we can use any pool interface.
//! In these examples, we use the WeightedPool

extern crate balancer_sdk;
mod helpers;

use balancer_sdk::pools::*;
use balancer_sdk::*;
use ethcontract::tokens::Tokenize;
use ethers_core::utils;
use helpers::*;
use std::str::FromStr;

const POOL_ADDRESS: &str = "0x01abc00e86c7e258823b9a055fd62ca6cf61a163";

/// Get the active instance that will interact with the ethereum node.
/// You can replace the RPC_URL with whatever is your prefered rpc endpoint.
fn get_pool_instance() -> WeightedPool {
    const RPC_URL: &str = "https://rpc.flashbots.net/";
    let transport = ethcontract::web3::transports::Http::new(RPC_URL).unwrap();
    let web3 = ethcontract::Web3::new(transport);
    let pool_address = addr!(POOL_ADDRESS);

    WeightedPool::new(web3, pool_address)
}

// BASE POOL API EXAMPLES
async fn get_vault() {
    print_start_new_example("BasePool#getVault");

    let instance = get_pool_instance();
    let vault_address = instance.get_vault().call().await.unwrap();

    println!("Balancer Pool Vault Address {:#?}", vault_address,);
}

async fn get_pool_id() {
    print_start_new_example("BasePool#getPoolId");

    let instance = get_pool_instance();
    let id = instance.get_pool_id().call().await.unwrap();

    println!(
        "Balancer Pool Id {:#?} for pool with address {:#?}",
        id.into_token().to_string(),
        POOL_ADDRESS
    );
}

async fn get_swap_fee_percentage() {
    print_start_new_example("BasePool#getSwapFeePercentage");

    let instance = get_pool_instance();
    let fee = instance.get_swap_fee_percentage().call().await.unwrap();
    let fee_human_readable = utils::format_units::<usize, i32>(fee.as_usize(), 18 - 2).unwrap();

    println!(
        "Balancer Pool Id {:#?} swap fee percentage {:#?} ({:.4})%",
        POOL_ADDRESS, fee, fee_human_readable
    );
}

/**
* Updates the pool's swap fee.

 Note: This can only be called by an authorized account, denoted by the pool's owner. There are three cases for swap fee control:

 - Swap Fees are immutable
  - Owner: 0x0000000000000000000000000000000000000000
 - Swap Fees are controlled by a third party (currently Gauntlet)
  - Owner: 0xBA1BA1ba1BA1bA1bA1Ba1BA1ba1BA1bA1ba1ba1B
 - Swap Fees are controlled by an account immutably set at pool creation
  - Owner: the account which was set at pool creation
*/
async fn set_swap_fee_percentage() {
    print_start_new_example("BasePool#setSwapFeePercentage");

    let instance = get_pool_instance();

    let percentage = swap_fee!("0.15");

    let result = match instance
        .set_swap_fee_percentage(percentage.into())
        .call()
        .await
    {
        Ok(any) => any,
        Err(e) => println!(
            "This should fail with BAL#401 if you are not the pool owner. {}",
            e
        ),
    };

    println!("Balancer Pool fee set? {:#?}", result);
}

/**
 * All methods for the Vault API are supported and type secure.
 */
#[tokio::main]
async fn main() {
    get_vault().await;
    get_pool_id().await;
    get_swap_fee_percentage().await;
    set_swap_fee_percentage().await;
}