94 lines
2.2 KiB
Rust
94 lines
2.2 KiB
Rust
use std::{convert::AsRef, fmt::Debug, sync::Arc};
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use futures::{FutureExt, Stream, StreamExt, TryFutureExt, TryStreamExt, future::Either};
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use rocksdb::Direction;
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use serde::{Deserialize, Serialize};
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use tokio::task;
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use tuwunel_core::{Result, implement};
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use super::stream_from::is_cached;
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use crate::{
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keyval::{Key, result_deserialize_key, serialize_key},
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stream,
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};
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#[implement(super::Map)]
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pub fn keys_from<'a, K, P>(
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self: &'a Arc<Self>,
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from: &P,
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) -> impl Stream<Item = Result<Key<'_, K>>> + Send + use<'a, K, P>
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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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{
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self.keys_from_raw(from)
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.map(result_deserialize_key::<K>)
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}
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#[implement(super::Map)]
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#[tracing::instrument(skip(self), level = "trace")]
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pub fn keys_from_raw<P>(
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self: &Arc<Self>,
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from: &P,
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) -> impl Stream<Item = Result<Key<'_>>> + Send + use<'_, P>
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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.raw_keys_from(&key)
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}
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#[implement(super::Map)]
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pub fn keys_raw_from<'a, K, P>(
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self: &'a Arc<Self>,
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from: &P,
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) -> impl Stream<Item = Result<Key<'_, K>>> + Send + use<'a, K, P>
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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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{
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self.raw_keys_from(from)
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.map(result_deserialize_key::<K>)
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}
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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 raw_keys_from<P>(
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self: &Arc<Self>,
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from: &P,
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) -> impl Stream<Item = Result<Key<'_>>> + Send + use<'_, P>
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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::iter_options_default(&self.engine);
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let state = stream::State::new(self, opts);
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if is_cached(self, from) {
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let state = state.init_fwd(from.as_ref().into());
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return Either::Left(
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task::consume_budget()
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.map(move |()| stream::Keys::<'_>::from(state))
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.into_stream()
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.flatten(),
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);
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}
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let seek = Seek {
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map: self.clone(),
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dir: Direction::Forward,
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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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Either::Right(
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self.engine
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.pool
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.execute_iter(seek)
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.ok_into::<stream::Keys<'_>>()
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.into_stream()
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.try_flatten(),
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)
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}
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