read_value()/write_value(): put behind feature postcard-values

This commit is contained in:
Astro 2020-12-11 19:13:00 +01:00
parent fb28e8a9b1
commit 532ba8381f
4 changed files with 18 additions and 3 deletions

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@ -11,7 +11,11 @@ categories = ["embedded", "database"]
license = "GPL-3"
edition = "2018"
[features]
default = ["postcard-values"]
postcard-values = ["postcard", "serde"]
[dependencies]
byteorder = { version = "1", default-features = false }
serde = { version = "1.0", default-features = false }
postcard = "0.5"
serde = { version = "1.0", default-features = false, optional = true }
postcard = { version = "0.5", optional = true }

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@ -4,7 +4,9 @@ use core::{fmt, str};
pub enum Error<B> {
Read(ReadError),
Write(WriteError<B>),
#[cfg(feature = "postcard-values")]
Encode(postcard::Error),
#[cfg(feature = "postcard-values")]
Decode(postcard::Error),
}

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@ -2,6 +2,7 @@
use core::{mem::size_of, str};
use byteorder::{ByteOrder, BigEndian};
#[cfg(feature = "postcard-values")]
use serde::{Deserialize, Serialize};
mod error;
@ -59,10 +60,12 @@ impl<B: StoreBackend> Store<B> {
.map(|value| str::from_utf8(value)
.map_err(ReadError::Utf8Error)
)
.transpose())
.transpose()
)
}
/// read from `key`, decode with `postcard`
#[cfg(feature = "postcard-values")]
pub fn read_value<'a, T: Deserialize<'a>>(&'a self, key: &str) -> Result<Option<T>, Error<B::Error>> {
self.read(key)?
.map(
@ -159,6 +162,7 @@ impl<B: StoreBackend> Store<B> {
}
/// encode with `postcard`, write at `key`
#[cfg(feature = "postcard-values")]
pub fn write_value<T: Serialize>(&mut self, key: &str, value: T) -> Result<(), Error<B::Error>> {
let mut buf = [0; 64];
let data = postcard::to_slice(&value, &mut buf)

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@ -74,6 +74,7 @@ fn write_read_str_utf8() {
}
#[test]
#[cfg(feature = "postcard-values")]
fn write_read_value_str() {
let mut store = make_store();
store.write_value("foo", "bar").unwrap();
@ -81,6 +82,7 @@ fn write_read_value_str() {
}
#[test]
#[cfg(feature = "postcard-values")]
fn write_read_value_u32() {
let mut store = make_store();
store.write_value("foo", 42005u32).unwrap();
@ -88,6 +90,7 @@ fn write_read_value_u32() {
}
#[test]
#[cfg(feature = "postcard-values")]
fn write_read_value_i64() {
let mut store = make_store();
store.write_value("foo", -99999999i64).unwrap();
@ -95,6 +98,7 @@ fn write_read_value_i64() {
}
#[test]
#[cfg(feature = "postcard-values")]
fn write_read_value_f32() {
let mut store = make_store();
store.write_value("foo", 3.75e17f32).unwrap();
@ -102,6 +106,7 @@ fn write_read_value_f32() {
}
#[test]
#[cfg(feature = "postcard-values")]
fn write_read_value_f64() {
let mut store = make_store();
store.write_value("foo", -1.999e-13f64).unwrap();