nostr-sdk 0.44.1

High level Nostr client library.
Documentation 
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use std::sync::Arc;

use nostr::util::BoxedFuture;
use nostr::{Event, RelayUrl, SubscriptionId};
use nostr_gossip::NostrGossip;
use nostr_relay_pool::policy::{AdmitPolicy, AdmitStatus, PolicyError};

#[derive(Debug)]
pub(crate) struct AdmissionPolicyMiddleware {
    pub(crate) gossip: Option<Arc<dyn NostrGossip>>,
    pub(crate) external_policy: Option<Arc<dyn AdmitPolicy>>,
}

impl AdmitPolicy for AdmissionPolicyMiddleware {
    fn admit_connection<'a>(
        &'a self,
        relay_url: &'a RelayUrl,
    ) -> BoxedFuture<'a, Result<AdmitStatus, PolicyError>> {
        Box::pin(async move {
            match &self.external_policy {
                Some(policy) => policy.admit_connection(relay_url).await,
                None => Ok(AdmitStatus::Success),
            }
        })
    }

    fn admit_event<'a>(
        &'a self,
        relay_url: &'a RelayUrl,
        subscription_id: &'a SubscriptionId,
        event: &'a Event,
    ) -> BoxedFuture<'a, Result<AdmitStatus, PolicyError>> {
        Box::pin(async move {
            // Process event in gossip
            if let Some(gossip) = &self.gossip {
                gossip
                    .process(event, Some(relay_url))
                    .await
                    .map_err(PolicyError::backend)?;
            }

            // Check if event is allowed by external policy
            match &self.external_policy {
                Some(policy) => policy.admit_event(relay_url, subscription_id, event).await,
                None => Ok(AdmitStatus::Success),
            }
        })
    }
}