74 lines
2.3 KiB
Rust
74 lines
2.3 KiB
Rust
use std::{convert::AsRef, fmt::Debug};
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use conduit::{implement, Result};
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use futures::{
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future,
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stream::{Stream, StreamExt},
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TryStreamExt,
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};
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use serde::{Deserialize, Serialize};
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use crate::{keyval, keyval::KeyVal, ser};
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/// Iterate key-value entries in the map where the key matches a prefix.
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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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#[tracing::instrument(skip(self), fields(%self), level = "trace")]
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pub fn rev_stream_prefix<'a, K, V, P>(&'a self, prefix: &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.rev_stream_prefix_raw(prefix)
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.map(keyval::result_deserialize::<K, V>)
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}
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/// Iterate key-value entries in the map where the key matches a prefix.
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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), fields(%self), level = "trace")]
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pub fn rev_stream_prefix_raw<P>(&self, prefix: &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 = ser::serialize_to_vec(prefix).expect("failed to serialize query key");
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self.rev_raw_stream_from(&key)
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.try_take_while(move |(k, _): &KeyVal<'_>| future::ok(k.starts_with(&key)))
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}
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/// Iterate key-value entries in the map where the key matches a prefix.
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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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#[tracing::instrument(skip(self), fields(%self), level = "trace")]
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pub fn rev_stream_raw_prefix<'a, K, V, P>(
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&'a self, prefix: &'a P,
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) -> impl Stream<Item = Result<KeyVal<'_, K, V>>> + Send + 'a
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where
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P: AsRef<[u8]> + ?Sized + Debug + Sync + 'a,
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K: Deserialize<'a> + Send + 'a,
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V: Deserialize<'a> + Send + 'a,
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{
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self.rev_raw_stream_prefix(prefix)
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.map(keyval::result_deserialize::<K, V>)
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}
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/// Iterate key-value entries in the map where the key matches a prefix.
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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), fields(%self), level = "trace")]
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pub fn rev_raw_stream_prefix<'a, P>(&'a self, prefix: &'a P) -> impl Stream<Item = Result<KeyVal<'_>>> + Send + 'a
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where
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P: AsRef<[u8]> + ?Sized + Debug + Sync + 'a,
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{
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self.rev_raw_stream_from(prefix)
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.try_take_while(|(k, _): &KeyVal<'_>| future::ok(k.starts_with(prefix.as_ref())))
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}
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