anya_core/layer2/

taproot_assets.rs

//! Taproot Assets Layer 2 Integration
//!
//! This module provides integration with Taproot Assets (formerly known as Taro),
//! which enables issuing assets on Bitcoin using Taproot and Merkle trees.

use crate::layer2::{
    AssetParams, AssetTransfer, Layer2Protocol, Layer2ProtocolTrait, Proof, ProtocolState,
    TransactionStatus, TransferResult, ValidationResult, VerificationResult,
};
use serde::{Deserialize, Serialize};
use std::collections::HashMap;

/// Network type for Taproot Assets
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum Network {
    Mainnet,
    Testnet,
    Regtest,
}

/// Asset metadata for Taproot Assets
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AssetMetadata {
    pub name: String,
    pub supply: u64,
    pub precision: u8,
    pub issuer: String,
    pub additional_fields: HashMap<String, String>,
}

/// Issuance transaction result
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct IssuanceTx {
    pub txid: String,
    pub asset_id: String,
    pub taproot_script: String,
}

/// Taproot Assets configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TaprootAssetsConfig {
    /// Network type (mainnet, testnet, regtest)
    pub network: String,
    /// Bitcoin node RPC URL
    pub bitcoin_rpc_url: String,
    /// Taproot Assets daemon URL
    pub tapd_url: String,
    /// Enable asset universe sync
    pub universe_sync: bool,
    /// Timeout in milliseconds
    pub timeout_ms: u64,
}

impl Default for TaprootAssetsConfig {
    fn default() -> Self {
        Self {
            network: "mainnet".to_string(),
            bitcoin_rpc_url: "http://localhost:8332".to_string(),
            tapd_url: "http://localhost:8089".to_string(),
            universe_sync: true,
            timeout_ms: 30000,
        }
    }
}

/// Taproot Assets protocol implementation
#[derive(Debug)]
pub struct TaprootAssetsProtocol {
    config: TaprootAssetsConfig,
    state: ProtocolState,
}

impl TaprootAssetsProtocol {
    /// Create a new Taproot Assets protocol instance
    pub fn new(config: TaprootAssetsConfig) -> Self {
        Self {
            config,
            state: ProtocolState {
                version: "0.3.0".to_string(), // Current Taproot Assets version
                connections: 0,
                capacity: None, // No fixed capacity
                operational: false,
                height: 0,
                hash: "default_hash".to_string(),
                timestamp: std::time::SystemTime::now()
                    .duration_since(std::time::UNIX_EPOCH)
                    .unwrap_or_default()
                    .as_secs(),
            },
        }
    }

    /// Get Taproot Assets-specific configuration
    pub fn get_config(&self) -> &TaprootAssetsConfig {
        &self.config
    }

    /// Mint a new asset
    pub fn mint_asset(
        &self,
        name: &str,
        supply: u64,
        asset_type: &str,
    ) -> Result<String, Box<dyn std::error::Error + Send + Sync>> {
        println!("Minting {asset_type} asset '{name}' with supply {supply}");
        Ok(format!("taproot_asset_{asset_type}_{name}"))
    }

    /// Create asset universe proof
    pub fn create_universe_proof(
        &self,
        asset_id: &str,
    ) -> Result<Vec<u8>, Box<dyn std::error::Error + Send + Sync>> {
        println!("Creating universe proof for asset {asset_id}");
        Ok(vec![0x01, 0x02, 0x03, 0x04]) // Mock proof
    }
}

impl Default for TaprootAssetsProtocol {
    fn default() -> Self {
        Self::new(TaprootAssetsConfig::default())
    }
}

impl Layer2ProtocolTrait for TaprootAssetsProtocol {
    /// Initialize the Taproot Assets protocol
    fn initialize(&self) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
        println!("Initializing Taproot Assets protocol...");
        Ok(())
    }

    /// Get the current state of the protocol
    fn get_state(&self) -> Result<ProtocolState, Box<dyn std::error::Error + Send + Sync>> {
        Ok(self.state.clone())
    }

    /// Submit a transaction (asset transfer)
    fn submit_transaction(
        &self,
        tx_data: &[u8],
    ) -> Result<String, Box<dyn std::error::Error + Send + Sync>> {
        println!(
            "Submitting Taproot Assets transaction: {} bytes",
            tx_data.len()
        );
        Ok("taproot_tx_".to_string() + &hex::encode(&tx_data[..8]))
    }

    /// Check transaction status
    fn check_transaction_status(
        &self,
        tx_id: &str,
    ) -> Result<TransactionStatus, Box<dyn std::error::Error + Send + Sync>> {
        println!("Checking Taproot Assets transaction status: {tx_id}");
        Ok(TransactionStatus::Confirmed)
    }

    /// Synchronize state
    fn sync_state(&mut self) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
        println!("Syncing Taproot Assets state...");
        self.state.operational = true;
        self.state.connections = 1;
        Ok(())
    }

    /// Issue a new Taproot asset
    fn issue_asset(
        &self,
        params: AssetParams,
    ) -> Result<String, Box<dyn std::error::Error + Send + Sync>> {
        println!("Issuing Taproot asset {}", params.name);
        let asset_id = self.mint_asset(&params.name, params.total_supply, "normal")?;
        Ok(asset_id)
    }

    /// Transfer a Taproot asset
    fn transfer_asset(
        &self,
        transfer: AssetTransfer,
    ) -> Result<TransferResult, Box<dyn std::error::Error + Send + Sync>> {
        println!(
            "Transferring {} of Taproot asset {} to {}",
            transfer.amount, transfer.asset_id, transfer.recipient
        );

        Ok(TransferResult {
            tx_id: format!("taproot_transfer_{}", transfer.asset_id),
            status: TransactionStatus::Confirmed,
            fee: Some(546), // Bitcoin dust limit
            timestamp: std::time::SystemTime::now()
                .duration_since(std::time::UNIX_EPOCH)
                .unwrap()
                .as_secs(),
        })
    }

    /// Verify a Merkle proof for Taproot assets
    fn verify_proof(
        &self,
        proof: Proof,
    ) -> Result<VerificationResult, Box<dyn std::error::Error + Send + Sync>> {
        println!("Verifying Taproot {} proof", proof.proof_type);

        // In a real implementation, this would verify Merkle proofs
        let is_valid = proof.proof_type == "merkle" || proof.proof_type == "universe";

        Ok(VerificationResult {
            valid: is_valid,
            is_valid,
            error: if is_valid {
                None
            } else {
                Some("Invalid proof type".to_string())
            },
            timestamp: std::time::SystemTime::now()
                .duration_since(std::time::UNIX_EPOCH)
                .unwrap()
                .as_secs(),
        })
    }

    /// Validate Taproot Assets state
    fn validate_state(
        &self,
        state_data: &[u8],
    ) -> Result<ValidationResult, Box<dyn std::error::Error + Send + Sync>> {
        println!(
            "Validating Taproot Assets state: {} bytes",
            state_data.len()
        );

        // Basic validation - ensure state data is not empty
        let violations = if state_data.is_empty() {
            vec!["State data cannot be empty".to_string()]
        } else {
            vec![]
        };

        Ok(ValidationResult {
            is_valid: violations.is_empty(),
            violations,
            timestamp: std::time::SystemTime::now()
                .duration_since(std::time::UNIX_EPOCH)
                .unwrap()
                .as_secs(),
        })
    }
}

/// Implementation of async Layer2Protocol trait for TaprootAssetsProtocol
#[async_trait::async_trait]
impl Layer2Protocol for TaprootAssetsProtocol {
    async fn initialize(&self) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
        // Reuse existing sync implementation
        <TaprootAssetsProtocol as Layer2ProtocolTrait>::initialize(self)
    }

    async fn connect(&self) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
        println!("Asynchronously connecting to Taproot Assets network...");
        Ok(())
    }

    async fn get_state(&self) -> Result<ProtocolState, Box<dyn std::error::Error + Send + Sync>> {
        // Reuse existing sync implementation
        <TaprootAssetsProtocol as Layer2ProtocolTrait>::get_state(self)
    }

    async fn submit_transaction(
        &self,
        tx_data: &[u8],
    ) -> Result<String, Box<dyn std::error::Error + Send + Sync>> {
        println!(
            "Asynchronously submitting transaction to Taproot Assets: {} bytes",
            tx_data.len()
        );
        // Reuse existing sync implementation with logging
        <TaprootAssetsProtocol as Layer2ProtocolTrait>::submit_transaction(self, tx_data)
    }

    async fn check_transaction_status(
        &self,
        tx_id: &str,
    ) -> Result<TransactionStatus, Box<dyn std::error::Error + Send + Sync>> {
        println!(
            "Asynchronously checking Taproot Assets transaction status: {}",
            tx_id
        );
        // Reuse existing sync implementation
        <TaprootAssetsProtocol as Layer2ProtocolTrait>::check_transaction_status(self, tx_id)
    }

    async fn sync_state(&mut self) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
        println!("Asynchronously syncing Taproot Assets state...");
        // Reuse existing sync implementation
        <TaprootAssetsProtocol as Layer2ProtocolTrait>::sync_state(self)
    }

    async fn issue_asset(
        &self,
        params: AssetParams,
    ) -> Result<String, Box<dyn std::error::Error + Send + Sync>> {
        println!("Asynchronously issuing Taproot asset {}", params.name);
        // Reuse existing sync implementation
        <TaprootAssetsProtocol as Layer2ProtocolTrait>::issue_asset(self, params)
    }

    async fn transfer_asset(
        &self,
        transfer: AssetTransfer,
    ) -> Result<TransferResult, Box<dyn std::error::Error + Send + Sync>> {
        println!(
            "Asynchronously transferring {} of Taproot asset {} to {}",
            transfer.amount, transfer.asset_id, transfer.recipient
        );
        // Reuse existing sync implementation
        <TaprootAssetsProtocol as Layer2ProtocolTrait>::transfer_asset(self, transfer)
    }

    async fn verify_proof(
        &self,
        proof: Proof,
    ) -> Result<VerificationResult, Box<dyn std::error::Error + Send + Sync>> {
        println!(
            "Asynchronously verifying Taproot {} proof",
            proof.proof_type
        );
        // Reuse existing sync implementation
        <TaprootAssetsProtocol as Layer2ProtocolTrait>::verify_proof(self, proof)
    }

    async fn validate_state(
        &self,
        state_data: &[u8],
    ) -> Result<ValidationResult, Box<dyn std::error::Error + Send + Sync>> {
        println!(
            "Asynchronously validating Taproot Assets state: {} bytes",
            state_data.len()
        );
        // Reuse existing sync implementation
        <TaprootAssetsProtocol as Layer2ProtocolTrait>::validate_state(self, state_data)
    }
}

/// Taproot Assets specific error
#[derive(Debug, Clone)]
pub enum Error {
    InvalidMetadata(String),
    NetworkError(String),
    AssetCreationFailed(String),
}

impl std::fmt::Display for Error {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Error::InvalidMetadata(msg) => write!(f, "Invalid metadata: {msg}"),
            Error::NetworkError(msg) => write!(f, "Network error: {msg}"),
            Error::AssetCreationFailed(msg) => write!(f, "Asset creation failed: {msg}"),
        }
    }
}

impl std::error::Error for Error {}

/// Create a Taproot asset
pub async fn create_taproot_asset(
    metadata: &AssetMetadata,
    network: &Network,
) -> Result<IssuanceTx, Error> {
    // Validate metadata
    if metadata.name.is_empty() {
        return Err(Error::InvalidMetadata(
            "Asset name cannot be empty".to_string(),
        ));
    }

    if metadata.supply == 0 {
        return Err(Error::InvalidMetadata(
            "Asset supply must be greater than 0".to_string(),
        ));
    }

    // Generate mock transaction (in real implementation, this would create actual Taproot Assets)
    let txid = format!("{}_{}_txid", metadata.name, network_to_string(network));
    let asset_id = format!("{}_{}_asset_id", metadata.name, network_to_string(network));
    let taproot_script = "tr(KEY,{SILENT_LEAF})".to_string();

    Ok(IssuanceTx {
        txid,
        asset_id,
        taproot_script,
    })
}

/// Create a Taproot asset for mobile (JSON interface)
pub async fn create_taproot_asset_mobile(
    metadata_json: &str,
    network_str: &str,
) -> Result<String, Error> {
    // Parse metadata
    let metadata: AssetMetadata = serde_json::from_str(metadata_json)
        .map_err(|e| Error::InvalidMetadata(format!("Failed to parse metadata: {e}")))?;

    // Parse network
    let network = match network_str.to_lowercase().as_str() {
        "mainnet" => Network::Mainnet,
        "testnet" => Network::Testnet,
        "regtest" => Network::Regtest,
        _ => {
            return Err(Error::NetworkError(format!(
                "Unknown network: {network_str}"
            )))
        }
    };

    // Create asset
    let issuance_tx = create_taproot_asset(&metadata, &network).await?;

    // Return JSON result
    serde_json::to_string(&issuance_tx)
        .map_err(|e| Error::AssetCreationFailed(format!("Failed to serialize result: {e}")))
}

fn network_to_string(network: &Network) -> &'static str {
    match network {
        Network::Mainnet => "mainnet",
        Network::Testnet => "testnet",
        Network::Regtest => "regtest",
    }
}