conduwuit/src/database/map/rev_stream.rs

use conduit::{implement, Result};
use futures::stream::{Stream, StreamExt};
use serde::Deserialize;

use crate::{keyval, keyval::KeyVal, stream, stream::Cursor};

/// Iterate key-value entries in the map from the end.
///
/// - Result is deserialized
#[implement(super::Map)]
pub fn rev_stream<'a, K, V>(&'a self) -> impl Stream<Item = Result<KeyVal<'_, K, V>>> + Send
where
	K: Deserialize<'a> + Send,
	V: Deserialize<'a> + Send,
{
	self.rev_raw_stream()
		.map(keyval::result_deserialize::<K, V>)
}

/// Iterate key-value entries in the map from the end.
///
/// - Result is raw
#[implement(super::Map)]
#[tracing::instrument(skip(self), fields(%self), level = "trace")]
pub fn rev_raw_stream(&self) -> impl Stream<Item = Result<KeyVal<'_>>> + Send {
	let opts = super::read_options_default();
	stream::ItemsRev::new(&self.db, &self.cf, opts).init(None)
}