Nostr SDK

Description

A full-featured SDK for building high-performance and reliable nostr applications.

The SDK can be used to build both sides of a nostr application:

• clients, bots, and services that connect to existing relays;
• local relays that run inside your process, including mock relays for tests.

Getting started

Client

use std::net::{Ipv4Addr, SocketAddr, SocketAddrV4};

use nostr_sdk::prelude::*;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Generate new random keys
    let keys = Keys::generate();

    // Or use your already existing (from hex or bech32)
    let keys = Keys::parse("hex-or-bech32-secret-key")?;

    // Show bech32 public key
    let bech32_pubkey: String = keys.public_key().to_bech32()?;
    println!("Bech32 PubKey: {}", bech32_pubkey);

    // Configure client to use proxy for `.onion` relays
    let addr = SocketAddr::V4(SocketAddrV4::new(Ipv4Addr::LOCALHOST, 9050));
    let proxy: Proxy = Proxy::onion(addr);
    let client = Client::builder().proxy(proxy).build();

    // Add relays
    client.add_relay("wss://relay.damus.io").await?;
    client.add_relay("ws://jgqaglhautb4k6e6i2g34jakxiemqp6z4wynlirltuukgkft2xuglmqd.onion").await?;

    // Add read relay
    client.add_relay("wss://relay.nostr.info").capabilities(RelayCapabilities::READ).await?;

    // Connect to relays
    client.connect().await;

    // Publish a text note
    let event = EventBuilder::new(Kind::TextNote, "My first text note from rust-nostr!")
        .finalize(&keys)?;
    client.send_event(&event).await?;

    Ok(())
}

Local Relay

The local-relay feature enables in-process relays without re-implementing policies, storage, or protocol handling.

• LocalRelay runs a fully fledged relay inside your process.
• MockRelay runs an ephemeral relay for unit and integration tests.

use std::time::Duration;

use nostr_sdk::prelude::*;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Create the relay. If no database is provided, an in-memory database is used.
    let relay = LocalRelay::builder()
        .port(7777)
        .rate_limit(RateLimit {
            max_reqs: 128,
            notes_per_minute: 30,
        })
        .build();

    // Start the relay.
    relay.run().await?;

    println!("Relay listening on {}", relay.url().await);

    // Keep the process running
    loop {
        tokio::time::sleep(Duration::from_secs(60)).await;
    }
}

More examples can be found in the examples directory.

Crate Feature Flags

The following crate feature flags are available:

Local Relay supported NIPs

Legend:

• ✅ Fully supported
• 🔧 Depends on the database implementation
• ❌ Not supported

*: The relay does not accept or send expired events. The database has to delete them.

WASM

This crate supports the wasm32 targets.

An example can be found at nostr-sdk-wasm-example repo.

On macOS, you need to install llvm:

brew install llvm
LLVM_PATH=$(brew --prefix llvm)
AR="${LLVM_PATH}/bin/llvm-ar" CC="${LLVM_PATH}/bin/clang" cargo build --target wasm32-unknown-unknown

NOTE: Currently nip03 feature not support WASM.

Changelog

All notable changes to this library are documented in the CHANGELOG.md.

State

This library is in an ALPHA state, things that are implemented generally work, but the API will change in breaking ways.

Donations

Nostr Dev Kit is free and open-source. This means we do not earn any revenue by selling it. Instead, we rely on your financial support. If you actively use any of the libs/software/services, then please donate.

License

This project is distributed under the MIT software license – see the LICENSE file for details