nanows 2.0.2

A robust, type-safe Python client for interacting with Nano cryptocurrency nodes via WebSockets

NanoWS V2

A robust, type-safe Python client for interacting with Nano cryptocurrency nodes via WebSockets.

Features

• Clean Domain-Driven Design Architecture: Clear separation of concerns with domain, application, and infrastructure layers.
• Type Safety: Strong typing for all APIs using Python type hints.
• Automatic Reconnection: Handles connection drops and automatically reconnects to the server.
• Subscription Restoration: Automatically restores all subscriptions after reconnection.
• Comprehensive Topic Support: Supports all Nano WebSocket API topics and filters.
• Typed Messages: Parses WebSocket messages into typed objects for easier handling.

Installation

pip install nanows

Quick Start

import asyncio
from nanows.api import NanoWebSocketClient

async def main():
    # Create the client
    client = NanoWebSocketClient(url="ws://localhost:7078")
    
    try:
        # Connect to the WebSocket server
        await client.connect()
        
        # Subscribe to telemetry messages
        await client.subscribe_telemetry()
        
        # Subscribe to confirmation messages for specific accounts
        await client.subscribe_confirmation(
            accounts=["nano_1ipx847tk8o46pwxt5qjdbncjqcbwcc1rrmqnkztrfjy5k7z4imsrata9est"],
            include_election_info=True
        )
        
        # Receive and process messages
        async for message in client.receive_messages():
            if message.topic == "telemetry":
                print(f"Telemetry update - Block count: {message.block_count}")
            
            elif message.topic == "confirmation":
                print(f"Confirmation - Account: {message.account}, Amount: {message.amount}")
    
    finally:
        # Disconnect from the WebSocket server
        await client.disconnect()

# Run the example
asyncio.run(main())

Using the Context Manager

import asyncio
from nanows.api import NanoWebSocketClient

async def main():
    async with NanoWebSocketClient(url="ws://localhost:7078") as client:
        # Subscribe to telemetry messages
        await client.subscribe_telemetry()
        
        # Receive and process messages
        async for message in client.receive_messages():
            if message.topic == "telemetry":
                print(f"Telemetry update - Block count: {message.block_count}")

# Run the example
asyncio.run(main())

Automatic Reconnection

The client automatically handles connection drops and reconnects to the server. All subscriptions are restored after reconnection.

client = NanoWebSocketClient(
    url="ws://localhost:7078",
    reconnect_attempts=10,  # Maximum number of reconnection attempts
    reconnect_delay=2.0,    # Initial delay between reconnection attempts (seconds)
    reconnect_backoff=1.2,  # Backoff factor for reconnection delay
    keepalive_interval=60   # Interval between keepalive messages (seconds)
)

Supported Topics

• confirmation: Block confirmations
• vote: Representative votes
• telemetry: Node telemetry
• started_election: Started elections
• stopped_election: Stopped elections
• new_unconfirmed_block: New unconfirmed blocks
• bootstrap: Bootstrap events
• active_difficulty: Active difficulty updates
• work: Proof of work generation

Typed Messages

The client parses WebSocket messages into typed objects for easier handling:

async for message in client.receive_messages():
    if isinstance(message, ConfirmationMessage):
        # Handle confirmation message
        print(f"Confirmation - Account: {message.account}, Amount: {message.amount}")
        
    elif isinstance(message, TelemetryMessage):
        # Handle telemetry message
        print(f"Telemetry - Block count: {message.block_count}, Peer count: {message.peer_count}")

Architecture

The client is built using a clean Domain-Driven Design architecture:

• Domain Layer: Contains the core domain models and interfaces
• Application Layer: Contains the high-level services that orchestrate the domain
• Infrastructure Layer: Contains the concrete implementations of the interfaces

License

MIT