93 lines
2.4 KiB
Rust
93 lines
2.4 KiB
Rust
use std::{convert::AsRef, fmt::Debug, sync::Arc};
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use conduit::{implement, Result};
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use futures::{
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stream::{Stream, StreamExt},
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FutureExt, TryFutureExt, TryStreamExt,
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};
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use rocksdb::Direction;
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use serde::{Deserialize, Serialize};
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use crate::{
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keyval::{result_deserialize, serialize_key, KeyVal},
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stream,
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};
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/// Iterate key-value entries in the map starting from upper-bound.
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///
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/// - Query is serialized
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/// - Result is deserialized
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#[implement(super::Map)]
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pub fn rev_stream_from<'a, K, V, P>(
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self: &'a Arc<Self>, from: &P,
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) -> impl Stream<Item = Result<KeyVal<'_, K, V>>> + Send
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where
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P: Serialize + ?Sized + Debug,
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K: Deserialize<'a> + Send,
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V: Deserialize<'a> + Send,
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{
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self.rev_stream_from_raw(from)
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.map(result_deserialize::<K, V>)
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}
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/// Iterate key-value entries in the map starting from upper-bound.
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///
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/// - Query is serialized
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/// - Result is raw
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#[implement(super::Map)]
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#[tracing::instrument(skip(self), level = "trace")]
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pub fn rev_stream_from_raw<P>(self: &Arc<Self>, from: &P) -> impl Stream<Item = Result<KeyVal<'_>>> + Send
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where
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P: Serialize + ?Sized + Debug,
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{
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let key = serialize_key(from).expect("failed to serialize query key");
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self.rev_raw_stream_from(&key)
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}
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/// Iterate key-value entries in the map starting from upper-bound.
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///
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/// - Query is raw
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/// - Result is deserialized
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#[implement(super::Map)]
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pub fn rev_stream_raw_from<'a, K, V, P>(
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self: &'a Arc<Self>, from: &P,
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) -> impl Stream<Item = Result<KeyVal<'_, K, V>>> + Send
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where
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P: AsRef<[u8]> + ?Sized + Debug + Sync,
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K: Deserialize<'a> + Send,
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V: Deserialize<'a> + Send,
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{
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self.rev_raw_stream_from(from)
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.map(result_deserialize::<K, V>)
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}
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/// Iterate key-value entries in the map starting from upper-bound.
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///
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/// - Query is raw
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/// - Result is raw
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#[implement(super::Map)]
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#[tracing::instrument(skip(self, from), fields(%self), level = "trace")]
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pub fn rev_raw_stream_from<P>(self: &Arc<Self>, from: &P) -> impl Stream<Item = Result<KeyVal<'_>>> + Send
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where
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P: AsRef<[u8]> + ?Sized + Debug,
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{
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use crate::pool::Seek;
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let opts = super::read_options_default();
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let state = stream::State::new(&self.db, &self.cf, opts);
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let seek = Seek {
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map: self.clone(),
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dir: Direction::Reverse,
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key: Some(from.as_ref().into()),
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state: crate::pool::into_send_seek(state),
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res: None,
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};
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self.db
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.pool
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.execute_iter(seek)
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.ok_into::<stream::ItemsRev<'_>>()
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.into_stream()
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.try_flatten()
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.boxed()
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}
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