ollama run mistral-nemo:12b
>>> build me a Nostr relay
To create a Nostr relay, you'll need to implement the following
functionalities:
1. Handle connect/disconnect events from clients.
2. Relay messages between connected clients and external relays.
3. Implement message filtering based on user preferences (e.g., kind,
tags).
4. Validate and publish new notes and events.
Here's a basic Python implementation using asyncio for handling
asynchronous connections. This relay will support text notes with optional
tags. You'll need to install the `nostr` library first (`pip install
nostr`).
```python
import asyncio
from nostr import Note, Event
from nostr.relay_manager import RelayManager
# Global relay manager instance
relay_manager = RelayManager()
class NostrRelay:
def __init__(self, host="0.0.0.0", port=6006):
self.host = host
self.port = port
self.clients = set()
self.filter = {"#t": ["text"]} # Default filter for '#t' tag
async def broadcast(self, message):
for client in self.clients:
if client != message.source and not isinstance(message, Event)
or client.filter(message):
await client.send(message)
async def handle_client(self, reader, writer):
self.clients.add(writer)
try:
while True:
data = await reader.read(1024)
if not data:
break
message = await relay_manager.deserialize(data)
if isinstance(message, Note) or isinstance(message,
Event):
# Validate and publish new notes/events
if message.content.strip() and message.kind in [0, 1]:
# Text note (kind=0) or metadata (kind=1)
await self.broadcast(message)
relay_manager.publish(message)
elif isinstance(message, str) and
message.startswith("filter "):
# Update client's filter preferences
tag, value = message.split(" ", 2)[1:]
writer.filter = {tag: [value]}
else:
raise ValueError(f"Unknown message: {message}")
except Exception as e:
print(f"Error handling client: {e}")
finally:
self.clients.remove(writer)
writer.close()
def filter(self, message):
return all(message.tags.get(tag) == value for tag, value in
self.filter.items())
async def run(self):
server = await asyncio.start_server(self.handle_client, self.host,
self.port)
print(f"Nostr Relay listening on {self.host}:{self.port}")
try:
await server.serve_forever()
except KeyboardInterrupt:
pass
finally:
server.close()
if __name__ == "__main__":
relay = NostrRelay()
asyncio.run(relay.run())
```
To run this relay:
1. Save the script as `nostr_relay.py`.
2. Install the required libraries (`pip install nostr`).
3. Run the script using `python nostr_relay.py`.
This basic implementation supports text notes with optional tags and
allows clients to specify filter preferences by sending `filter #t
support more features like metadata (kind=1), follow/followers lists,
reactions (kind=7), etc.
For a production-grade Nostr relay, consider using an existing open-source
project like `nostr-relay` by nbs Code or building upon the reference
implementation provided by the Nostr project.
>>> Please write a Nostr relay in TypeScript for me
Here's a basic Nostr relay implementation in TypeScript using Node.js and
the `nostr-tools` library. This relay will support text notes with
optional tags, kind filtering, and event relaying.
First, make sure to install the required dependencies:
```bash
npm init -y
npm install nostr-tools net
```
Now, create a file named `nostr-relay.ts`:
```typescript
import { Event, Note, RelayManager } from 'nostr-tools';
import * as net from 'net';
type Filter = {
kinds?: number[];
tags?: Record
};
class NostrRelay {
private host: string;
private port: number;
private clients: Set
private filter: Filter = {};
constructor(host = '0.0.0.0', port = 6006) {
this.host = host;
this.port = port;
}
private broadcast(message: Event): void {
for (const client of this.clients) {
if (
client !== message.source &&
(!message.kind || this.filter.kinds?.includes(message.kind)) &&
(!this.filter.tags ||
Object.entries(this.filter.tags).every(([tag, values]) =>
values.includes(message.tags?.[tag] ?? '')))
) {
client.write(RelayManager.serialize(message));
}
}
}
private handleClient(client: net.Socket): void {
this.clients.add(client);
client.on('data', (data) => {
try {
const message = RelayManager.deserialize(data.toString());
if (!(message instanceof Event)) return;
if (message instanceof Note && message.content.trim()) {
// Validate and publish new notes/events
this.broadcast(message);
RelayManager.publish(message);
} else if (typeof message === 'string' &&
message.startsWith('filter ')) {
// Update client's filter preferences
const [, ...args] = message.split(' ');
const [tag, value] = args.map((arg) => arg.trim());
this.filter.tags ??= {};
this.filter.tags[tag] = (this.filter.tags[tag] ||
[]).concat(value);
} else {
throw new Error(`Unknown message: ${message}`);
}
} catch (error) {
console.error('Error handling client:', error);
}
});
client.on('end', () => {
this.clients.delete(client);
});
}
private start(): void {
const server = net.createServer(this.handleClient.bind(this));
server.listen(this.port, this.host, () => {
console.log(`Nostr Relay listening on ${this.host}:${this.port}`);
});
}
}
const relay = new NostrRelay();
relay.start();
```
To run the relay:
1. Save the script as `nostr-relay.ts`.
2. Install the required libraries (`npm install nostr-tools net`).
3. Compile and run the TypeScript code using Node.js: `ts-node
nostr-relay.ts`.
This basic implementation supports text notes with optional tags, kind
filtering (using `filter kinds
on specified filters. You can extend this implementation to support more
features like metadata, follow/followers lists, reactions, etc.
For a production-grade Nostr relay, consider using an existing open-source
project or building upon the reference implementation provided by the
Nostr project. Keep in mind that handling large numbers of connections and
messages efficiently requires careful considerations regarding performance
optimizations, error handling, and other aspects specific to your use
case.
Don't forget to monitor and maintain your relay's health regularly, as
unexpected issues can arise due to various factors such as network
instability or software bugs.