57 lines
1.6 KiB
Rust
57 lines
1.6 KiB
Rust
use std::{convert::AsRef, fmt::Debug, io::Write, sync::Arc};
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use futures::Future;
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use serde::Serialize;
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use tuwunel_core::{Result, arrayvec::ArrayVec, implement};
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use crate::{Handle, keyval::KeyBuf, ser};
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/// Fetch a value from the database into cache, returning a reference-handle
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/// asynchronously. The key is serialized into an allocated buffer to perform
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/// the query.
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#[implement(super::Map)]
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#[inline]
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pub fn qry<K>(
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self: &Arc<Self>,
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key: &K,
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) -> impl Future<Output = Result<Handle<'_>>> + Send + use<'_, K>
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where
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K: Serialize + ?Sized + Debug,
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{
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let mut buf = KeyBuf::new();
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self.bqry(key, &mut buf)
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}
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/// Fetch a value from the database into cache, returning a reference-handle
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/// asynchronously. The key is serialized into a fixed-sized buffer to perform
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/// the query. The maximum size is supplied as const generic parameter.
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#[implement(super::Map)]
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#[inline]
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pub fn aqry<const MAX: usize, K>(
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self: &Arc<Self>,
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key: &K,
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) -> impl Future<Output = Result<Handle<'_>>> + Send + use<'_, MAX, K>
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where
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K: Serialize + ?Sized + Debug,
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{
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let mut buf = ArrayVec::<u8, MAX>::new();
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self.bqry(key, &mut buf)
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}
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/// Fetch a value from the database into cache, returning a reference-handle
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/// asynchronously. The key is serialized into a user-supplied Writer.
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#[implement(super::Map)]
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#[tracing::instrument(skip(self, buf), level = "trace")]
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pub fn bqry<K, B>(
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self: &Arc<Self>,
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key: &K,
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buf: &mut B,
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) -> impl Future<Output = Result<Handle<'_>>> + Send + use<'_, K, B>
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where
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K: Serialize + ?Sized + Debug,
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B: Write + AsRef<[u8]>,
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{
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let key = ser::serialize(buf, key).expect("failed to serialize query key");
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self.get(key)
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}
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