66 lines
1.9 KiB
Rust
66 lines
1.9 KiB
Rust
use std::{convert::AsRef, fmt::Debug};
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use conduit::{implement, Result};
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use futures::stream::{Stream, StreamExt};
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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 lower-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 stream_from<'a, K, V, P>(&'a self, from: &P) -> 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.stream_from_raw(from).map(result_deserialize::<K, V>)
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}
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/// Iterate key-value entries in the map starting from lower-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 stream_from_raw<P>(&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.raw_stream_from(&key)
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}
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/// Iterate key-value entries in the map starting from lower-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 stream_raw_from<'a, K, V, P>(&'a self, from: &P) -> 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.raw_stream_from(from).map(result_deserialize::<K, V>)
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}
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/// Iterate key-value entries in the map starting from lower-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 raw_stream_from<P>(&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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let opts = super::read_options_default();
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stream::Items::new(&self.db, &self.cf, opts, Some(from.as_ref()))
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}
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