sol-trade-sdk/examples/middleware_system/src/main.rs

use anyhow::Result;
use sol_trade_sdk::{
    common::{AnyResult, PriorityFee, TradeConfig},
    swqos::{SwqosConfig, SwqosRegion},
    trading::{
        core::params::PumpSwapParams, factory::DexType, middleware::builtin::LoggingMiddleware,
        InstructionMiddleware, MiddlewareManager,
    },
    SolanaTrade,
};
use solana_sdk::{
    commitment_config::CommitmentConfig, instruction::Instruction, pubkey::Pubkey,
    signature::Keypair,
};
use std::{str::FromStr, sync::Arc};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    test_middleware().await?;
    Ok(())
}

/// Custom middleware
#[derive(Clone)]
pub struct CustomMiddleware;

impl InstructionMiddleware for CustomMiddleware {
    fn name(&self) -> &'static str {
        "CustomMiddleware"
    }

    fn process_protocol_instructions(
        &self,
        protocol_instructions: Vec<Instruction>,
        protocol_name: String,
        is_buy: bool,
    ) -> Result<Vec<Instruction>> {
        // do anything you want here
        // you can modify the instructions here
        Ok(protocol_instructions)
    }

    fn process_full_instructions(
        &self,
        full_instructions: Vec<Instruction>,
        protocol_name: String,
        is_buy: bool,
    ) -> Result<Vec<Instruction>> {
        // do anything you want here
        // you can modify the instructions here
        Ok(full_instructions)
    }

    fn clone_box(&self) -> Box<dyn InstructionMiddleware> {
        Box::new(self.clone())
    }
}

/// Create SolanaTrade client
/// Initializes a new SolanaTrade client with configuration
async fn create_solana_trade_client() -> AnyResult<SolanaTrade> {
    println!("Creating SolanaTrade client...");

    // In real transactions, use your own private key to initialize the payer
    let payer = Keypair::new();
    let rpc_url = "https://api.mainnet-beta.solana.com".to_string();

    let swqos_configs = vec![SwqosConfig::Default(rpc_url.clone())];

    let trade_config = TradeConfig {
        rpc_url,
        commitment: CommitmentConfig::confirmed(),
        priority_fee: PriorityFee::default(),
        swqos_configs,
        lookup_table_key: None,
    };

    let solana_trade_client = SolanaTrade::new(Arc::new(payer), trade_config).await;
    println!("SolanaTrade client created successfully!");

    Ok(solana_trade_client)
}

async fn test_middleware() -> AnyResult<()> {
    let mut client = create_solana_trade_client().await?;
    // SDK example middleware that prints instruction information
    // You can reference LoggingMiddleware to implement the InstructionMiddleware trait for your own middleware
    let middleware_manager = MiddlewareManager::new().add_middleware(Box::new(CustomMiddleware));
    client = client.with_middleware_manager(middleware_manager);
    let mint_pubkey = Pubkey::from_str("pumpCmXqMfrsAkQ5r49WcJnRayYRqmXz6ae8H7H9Dfn")?;
    let buy_sol_cost = 100_000;
    let slippage_basis_points = Some(100);
    let recent_blockhash = client.rpc.get_latest_blockhash().await?;
    let pool_address = Pubkey::from_str("539m4mVWt6iduB6W8rDGPMarzNCMesuqY5eUTiiYHAgR")?;
    client
        .buy(
            DexType::PumpSwap,
            mint_pubkey,
            buy_sol_cost,
            slippage_basis_points,
            recent_blockhash,
            None,
            Box::new(PumpSwapParams::from_pool_address_by_rpc(&client.rpc, &pool_address).await?),
            None,
            true,
        )
        .await?;
    println!("tip: This transaction will not succeed because we're using a test account. You can modify the code to initialize the payer with your own private key");
    Ok(())
}