576 lines
No EOL
24 KiB
Python
576 lines
No EOL
24 KiB
Python
# Transaction processing and polling service for Lamassu ATM integration
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import asyncio
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import asyncpg
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from datetime import datetime, timedelta
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from typing import List, Optional, Dict, Any
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from loguru import logger
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import socket
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import threading
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import time
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try:
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import asyncssh
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SSH_AVAILABLE = True
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except ImportError:
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try:
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# Fallback to subprocess-based SSH tunnel
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import subprocess
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SSH_AVAILABLE = True
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except ImportError:
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SSH_AVAILABLE = False
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logger.warning("SSH tunnel support not available")
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from lnbits.core.services import create_invoice, pay_invoice
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from lnbits.settings import settings
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from .crud import (
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get_flow_mode_clients,
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get_payments_by_lamassu_transaction,
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create_dca_payment,
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get_client_balance_summary,
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get_active_lamassu_config,
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update_config_test_result
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)
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from .models import CreateDcaPaymentData, LamassuTransaction
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class LamassuTransactionProcessor:
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"""Handles polling Lamassu database and processing transactions for DCA distribution"""
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def __init__(self):
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self.last_check_time = None
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self.processed_transaction_ids = set()
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self.ssh_process = None
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self.ssh_key_path = None
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async def get_db_config(self) -> Optional[Dict[str, Any]]:
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"""Get database configuration from the database"""
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try:
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config = await get_active_lamassu_config()
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if not config:
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logger.error("No active Lamassu database configuration found")
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return None
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return {
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"host": config.host,
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"port": config.port,
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"database": config.database_name,
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"user": config.username,
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"password": config.password,
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"config_id": config.id,
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"use_ssh_tunnel": config.use_ssh_tunnel,
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"ssh_host": config.ssh_host,
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"ssh_port": config.ssh_port,
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"ssh_username": config.ssh_username,
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"ssh_password": config.ssh_password,
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"ssh_private_key": config.ssh_private_key
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}
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except Exception as e:
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logger.error(f"Error getting database configuration: {e}")
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return None
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def setup_ssh_tunnel(self, db_config: Dict[str, Any]) -> Optional[Dict[str, Any]]:
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"""Setup SSH tunnel if required and return modified connection config"""
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if not db_config.get("use_ssh_tunnel"):
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return db_config
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if not SSH_AVAILABLE:
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logger.error("SSH tunnel requested but SSH libraries not available")
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return None
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try:
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# Close existing tunnel if any
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self.close_ssh_tunnel()
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# Use subprocess-based SSH tunnel as fallback
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return self._setup_subprocess_ssh_tunnel(db_config)
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except Exception as e:
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logger.error(f"Failed to setup SSH tunnel: {e}")
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self.close_ssh_tunnel()
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return None
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def _setup_subprocess_ssh_tunnel(self, db_config: Dict[str, Any]) -> Optional[Dict[str, Any]]:
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"""Setup SSH tunnel using subprocess (compatible with all environments)"""
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import subprocess
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import socket
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# Find an available local port
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with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
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s.bind(('', 0))
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local_port = s.getsockname()[1]
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# Build SSH command
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ssh_cmd = [
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"ssh",
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"-N", # Don't execute remote command
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"-L", f"{local_port}:{db_config['host']}:{db_config['port']}",
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f"{db_config['ssh_username']}@{db_config['ssh_host']}",
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"-p", str(db_config['ssh_port']),
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"-o", "StrictHostKeyChecking=no",
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"-o", "UserKnownHostsFile=/dev/null",
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"-o", "LogLevel=ERROR"
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]
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# Add authentication method
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if db_config.get("ssh_password"):
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# Check if sshpass is available for password authentication
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try:
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import subprocess
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subprocess.run(["which", "sshpass"], check=True, capture_output=True)
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ssh_cmd = ["sshpass", "-p", db_config["ssh_password"]] + ssh_cmd
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except subprocess.CalledProcessError:
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logger.error("Password authentication requires 'sshpass' tool which is not installed. Please use SSH key authentication instead.")
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return None
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elif db_config.get("ssh_private_key"):
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# Write private key to temporary file
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import tempfile
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import os
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key_fd, key_path = tempfile.mkstemp(suffix='.pem')
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try:
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with os.fdopen(key_fd, 'w') as f:
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f.write(db_config["ssh_private_key"])
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os.chmod(key_path, 0o600)
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ssh_cmd.extend(["-i", key_path])
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self.ssh_key_path = key_path # Store for cleanup
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except Exception as e:
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os.unlink(key_path)
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raise e
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else:
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logger.error("SSH tunnel requires either private key or password")
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return None
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# Start SSH tunnel process
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try:
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self.ssh_process = subprocess.Popen(
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ssh_cmd,
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stdout=subprocess.DEVNULL,
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stderr=subprocess.DEVNULL,
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stdin=subprocess.DEVNULL
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)
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# Wait a moment for tunnel to establish
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import time
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time.sleep(2)
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# Check if process is still running
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if self.ssh_process.poll() is not None:
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raise Exception("SSH tunnel process terminated immediately")
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logger.info(f"SSH tunnel established: localhost:{local_port} -> {db_config['ssh_host']}:{db_config['ssh_port']} -> {db_config['host']}:{db_config['port']}")
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# Return modified config to connect through tunnel
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tunnel_config = db_config.copy()
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tunnel_config["host"] = "127.0.0.1"
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tunnel_config["port"] = local_port
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return tunnel_config
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except FileNotFoundError:
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logger.error("SSH command not found. SSH tunneling requires ssh (and sshpass for password auth) to be installed on the system.")
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return None
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except Exception as e:
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logger.error(f"Failed to establish SSH tunnel: {e}")
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return None
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def close_ssh_tunnel(self):
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"""Close SSH tunnel if active"""
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# Close subprocess-based tunnel
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if hasattr(self, 'ssh_process') and self.ssh_process:
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try:
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self.ssh_process.terminate()
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self.ssh_process.wait(timeout=5)
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logger.info("SSH tunnel process closed")
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except Exception as e:
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logger.warning(f"Error closing SSH tunnel process: {e}")
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try:
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self.ssh_process.kill()
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except:
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pass
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finally:
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self.ssh_process = None
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# Clean up temporary key file if exists
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if hasattr(self, 'ssh_key_path') and self.ssh_key_path:
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try:
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import os
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os.unlink(self.ssh_key_path)
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logger.info("SSH key file cleaned up")
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except Exception as e:
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logger.warning(f"Error cleaning up SSH key file: {e}")
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finally:
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self.ssh_key_path = None
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async def test_connection_detailed(self) -> Dict[str, Any]:
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"""Test connection with detailed step-by-step reporting"""
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result = {
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"success": False,
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"message": "",
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"steps": [],
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"ssh_tunnel_used": False,
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"ssh_tunnel_success": False,
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"database_connection_success": False,
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"config_id": None
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}
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try:
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# Step 1: Get configuration
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result["steps"].append("Retrieving database configuration...")
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db_config = await self.get_db_config()
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if not db_config:
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result["message"] = "No active Lamassu database configuration found"
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result["steps"].append("❌ No configuration found")
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return result
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result["config_id"] = db_config["config_id"]
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result["steps"].append("✅ Configuration retrieved")
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# Step 2: SSH Tunnel setup (if required)
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if db_config.get("use_ssh_tunnel"):
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result["ssh_tunnel_used"] = True
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result["steps"].append("Setting up SSH tunnel...")
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if not SSH_AVAILABLE:
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result["message"] = "SSH tunnel required but SSH support not available"
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result["steps"].append("❌ SSH support missing (requires ssh command line tool)")
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return result
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connection_config = self.setup_ssh_tunnel(db_config)
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if not connection_config:
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result["message"] = "Failed to establish SSH tunnel"
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result["steps"].append("❌ SSH tunnel failed - check SSH credentials and server accessibility")
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return result
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result["ssh_tunnel_success"] = True
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result["steps"].append(f"✅ SSH tunnel established to {db_config['ssh_host']}:{db_config['ssh_port']}")
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else:
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connection_config = db_config
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result["steps"].append("ℹ️ Direct database connection (no SSH tunnel)")
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# Step 3: Database connection
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result["steps"].append("Connecting to Postgres database...")
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connection = await asyncpg.connect(
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host=connection_config["host"],
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port=connection_config["port"],
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database=connection_config["database"],
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user=connection_config["user"],
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password=connection_config["password"],
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timeout=30
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)
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result["database_connection_success"] = True
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result["steps"].append("✅ Database connection successful")
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# Step 4: Test query
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result["steps"].append("Testing database query...")
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test_query = "SELECT 1 as test"
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await connection.fetchval(test_query)
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result["steps"].append("✅ Database query test successful")
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# Step 5: Test actual table access
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result["steps"].append("Testing access to cash_out_txs table...")
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table_query = "SELECT COUNT(*) FROM cash_out_txs LIMIT 1"
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count = await connection.fetchval(table_query)
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result["steps"].append(f"✅ Table access successful (found {count} transactions)")
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await connection.close()
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result["success"] = True
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result["message"] = "All connection tests passed successfully"
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except asyncpg.InvalidCatalogNameError:
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result["message"] = "Database not found - check database name"
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result["steps"].append("❌ Database does not exist")
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except asyncpg.InvalidPasswordError:
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result["message"] = "Authentication failed - check username/password"
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result["steps"].append("❌ Invalid database credentials")
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except asyncpg.CannotConnectNowError:
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result["message"] = "Database server not accepting connections"
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result["steps"].append("❌ Database server unavailable")
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except asyncpg.ConnectionDoesNotExistError:
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result["message"] = "Cannot connect to database server"
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result["steps"].append("❌ Cannot reach database server")
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except Exception as e:
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error_msg = str(e)
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if "cash_out_txs" in error_msg:
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result["message"] = "Connected to database but cash_out_txs table not found"
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result["steps"].append("❌ Lamassu transaction table missing")
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elif "paramiko" in error_msg.lower() or "ssh" in error_msg.lower():
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result["message"] = f"SSH tunnel error: {error_msg}"
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result["steps"].append(f"❌ SSH error: {error_msg}")
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else:
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result["message"] = f"Connection test failed: {error_msg}"
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result["steps"].append(f"❌ Unexpected error: {error_msg}")
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finally:
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# Always cleanup SSH tunnel
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self.close_ssh_tunnel()
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# Update test result in database
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if result["config_id"]:
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try:
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await update_config_test_result(result["config_id"], result["success"])
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except Exception as e:
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logger.warning(f"Could not update config test result: {e}")
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return result
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async def connect_to_lamassu_db(self) -> Optional[asyncpg.Connection]:
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"""Establish connection to Lamassu Postgres database"""
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try:
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db_config = await self.get_db_config()
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if not db_config:
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return None
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# Setup SSH tunnel if required
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connection_config = self.setup_ssh_tunnel(db_config)
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if not connection_config:
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return None
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connection = await asyncpg.connect(
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host=connection_config["host"],
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port=connection_config["port"],
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database=connection_config["database"],
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user=connection_config["user"],
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password=connection_config["password"],
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timeout=30
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)
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logger.info("Successfully connected to Lamassu database")
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# Update test result on successful connection
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try:
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await update_config_test_result(db_config["config_id"], True)
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except Exception as e:
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logger.warning(f"Could not update config test result: {e}")
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return connection
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except Exception as e:
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logger.error(f"Failed to connect to Lamassu database: {e}")
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# Update test result on failed connection
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try:
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db_config = await self.get_db_config()
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if db_config:
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await update_config_test_result(db_config["config_id"], False)
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except Exception as update_error:
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logger.warning(f"Could not update config test result: {update_error}")
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return None
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async def fetch_new_transactions(self, connection: asyncpg.Connection) -> List[Dict[str, Any]]:
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"""Fetch new successful transactions from Lamassu database"""
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try:
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# Set the time window - check for transactions in the last hour + 5 minutes buffer
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time_threshold = datetime.now() - timedelta(hours=1, minutes=5)
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# Query for successful cash-out transactions (people selling BTC for fiat)
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# These are the transactions that trigger DCA distributions
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query = """
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SELECT
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co.id as transaction_id,
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co.fiat as fiat_amount,
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co.crypto as crypto_amount,
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co.created as transaction_time,
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co.session_id,
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co.machine_id,
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co.status,
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co.commission_percentage,
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co.tx_hash
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FROM cash_out_txs co
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WHERE co.created >= $1
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AND co.status = 'confirmed'
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AND co.id NOT IN (
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-- Exclude already processed transactions
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SELECT DISTINCT lamassu_transaction_id
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FROM myextension.dca_payments
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WHERE lamassu_transaction_id IS NOT NULL
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)
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ORDER BY co.created DESC
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"""
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rows = await connection.fetch(query, time_threshold)
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transactions = []
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for row in rows:
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# Convert asyncpg.Record to dict
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transaction = {
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"transaction_id": str(row["transaction_id"]),
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"fiat_amount": int(row["fiat_amount"]), # Amount in smallest currency unit
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"crypto_amount": int(row["crypto_amount"]), # Amount in satoshis
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"transaction_time": row["transaction_time"],
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"session_id": row["session_id"],
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"machine_id": row["machine_id"],
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"status": row["status"],
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"commission_percentage": float(row["commission_percentage"]) if row["commission_percentage"] else 0.0,
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"tx_hash": row["tx_hash"]
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}
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transactions.append(transaction)
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logger.info(f"Found {len(transactions)} new transactions to process")
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return transactions
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except Exception as e:
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logger.error(f"Error fetching transactions from Lamassu database: {e}")
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return []
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async def calculate_distribution_amounts(self, transaction: Dict[str, Any]) -> Dict[str, int]:
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"""Calculate how much each Flow Mode client should receive"""
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try:
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# Get all active Flow Mode clients
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flow_clients = await get_flow_mode_clients()
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if not flow_clients:
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logger.info("No Flow Mode clients found - skipping distribution")
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return {}
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# Calculate principal amount (total - commission)
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fiat_amount = transaction["fiat_amount"]
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commission_percentage = transaction["commission_percentage"]
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commission_amount = int(fiat_amount * commission_percentage / 100)
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principal_amount = fiat_amount - commission_amount
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logger.info(f"Transaction: {fiat_amount}, Commission: {commission_amount}, Principal: {principal_amount}")
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# Get balance summaries for all clients to calculate proportions
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client_balances = {}
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total_confirmed_deposits = 0
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for client in flow_clients:
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balance = await get_client_balance_summary(client.id)
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if balance.remaining_balance > 0: # Only include clients with remaining balance
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client_balances[client.id] = balance.remaining_balance
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total_confirmed_deposits += balance.remaining_balance
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if total_confirmed_deposits == 0:
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logger.info("No clients with remaining DCA balance - skipping distribution")
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return {}
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# Calculate proportional distribution
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distributions = {}
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exchange_rate = transaction["crypto_amount"] / transaction["fiat_amount"] # sats per fiat unit
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for client_id, client_balance in client_balances.items():
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# Calculate this client's proportion of the principal
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proportion = client_balance / total_confirmed_deposits
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client_fiat_amount = int(principal_amount * proportion)
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client_sats_amount = int(client_fiat_amount * exchange_rate)
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distributions[client_id] = {
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"fiat_amount": client_fiat_amount,
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"sats_amount": client_sats_amount,
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"exchange_rate": exchange_rate
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}
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logger.info(f"Client {client_id[:8]}... gets {client_fiat_amount} fiat units = {client_sats_amount} sats")
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return distributions
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except Exception as e:
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logger.error(f"Error calculating distribution amounts: {e}")
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return {}
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async def distribute_to_clients(self, transaction: Dict[str, Any], distributions: Dict[str, Dict[str, int]]) -> None:
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"""Send Bitcoin payments to DCA clients"""
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try:
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transaction_id = transaction["transaction_id"]
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for client_id, distribution in distributions.items():
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try:
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# Get client info
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flow_clients = await get_flow_mode_clients()
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client = next((c for c in flow_clients if c.id == client_id), None)
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if not client:
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logger.error(f"Client {client_id} not found")
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continue
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# Create DCA payment record
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payment_data = CreateDcaPaymentData(
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client_id=client_id,
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amount_sats=distribution["sats_amount"],
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amount_fiat=distribution["fiat_amount"],
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exchange_rate=distribution["exchange_rate"],
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transaction_type="flow",
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lamassu_transaction_id=transaction_id
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)
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# Record the payment in our database
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dca_payment = await create_dca_payment(payment_data)
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# TODO: Actually send Bitcoin to client's wallet
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# This will be implemented when we integrate with LNBits payment system
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logger.info(f"DCA payment recorded for client {client_id[:8]}...: {distribution['sats_amount']} sats")
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except Exception as e:
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logger.error(f"Error processing distribution for client {client_id}: {e}")
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continue
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||
|
||
except Exception as e:
|
||
logger.error(f"Error distributing to clients: {e}")
|
||
|
||
async def process_transaction(self, transaction: Dict[str, Any]) -> None:
|
||
"""Process a single transaction - calculate and distribute DCA payments"""
|
||
try:
|
||
transaction_id = transaction["transaction_id"]
|
||
|
||
# Check if transaction already processed
|
||
existing_payments = await get_payments_by_lamassu_transaction(transaction_id)
|
||
if existing_payments:
|
||
logger.info(f"Transaction {transaction_id} already processed - skipping")
|
||
return
|
||
|
||
logger.info(f"Processing new transaction: {transaction_id}")
|
||
|
||
# Calculate distribution amounts
|
||
distributions = await self.calculate_distribution_amounts(transaction)
|
||
|
||
if not distributions:
|
||
logger.info(f"No distributions calculated for transaction {transaction_id}")
|
||
return
|
||
|
||
# Distribute to clients
|
||
await self.distribute_to_clients(transaction, distributions)
|
||
|
||
logger.info(f"Successfully processed transaction {transaction_id}")
|
||
|
||
except Exception as e:
|
||
logger.error(f"Error processing transaction {transaction.get('transaction_id', 'unknown')}: {e}")
|
||
|
||
async def poll_and_process(self) -> None:
|
||
"""Main polling function - checks for new transactions and processes them"""
|
||
try:
|
||
logger.info("Starting Lamassu transaction polling...")
|
||
|
||
# Connect to Lamassu database
|
||
connection = await self.connect_to_lamassu_db()
|
||
if not connection:
|
||
logger.error("Could not connect to Lamassu database - skipping this poll")
|
||
return
|
||
|
||
try:
|
||
# Fetch new transactions
|
||
new_transactions = await self.fetch_new_transactions(connection)
|
||
|
||
# Process each transaction
|
||
for transaction in new_transactions:
|
||
await self.process_transaction(transaction)
|
||
|
||
logger.info(f"Completed processing {len(new_transactions)} transactions")
|
||
|
||
finally:
|
||
await connection.close()
|
||
# Close SSH tunnel if it was used
|
||
self.close_ssh_tunnel()
|
||
|
||
except Exception as e:
|
||
logger.error(f"Error in polling cycle: {e}")
|
||
# Ensure cleanup on error
|
||
self.close_ssh_tunnel()
|
||
|
||
|
||
# Global processor instance
|
||
transaction_processor = LamassuTransactionProcessor()
|
||
|
||
|
||
async def poll_lamassu_transactions() -> None:
|
||
"""Entry point for the polling task"""
|
||
await transaction_processor.poll_and_process() |