MeiliSearch/dump/src/reader/v4/meta.rs

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Rust
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2022-10-06 15:49:30 +02:00
use std::{
fmt::{self, Display, Formatter},
marker::PhantomData,
str::FromStr,
};
use serde::{de::Visitor, Deserialize, Deserializer};
use uuid::Uuid;
use super::settings::{Settings, Unchecked};
#[derive(Deserialize, Debug)]
#[cfg_attr(test, derive(serde::Serialize))]
pub struct IndexUuid {
pub uid: String,
pub index_meta: IndexMeta,
}
#[derive(Deserialize, Debug)]
#[cfg_attr(test, derive(serde::Serialize))]
pub struct IndexMeta {
pub uuid: Uuid,
pub creation_task_id: usize,
}
// There is one in each indexes under `meta.json`.
#[derive(Deserialize)]
#[cfg_attr(test, derive(serde::Serialize))]
pub struct DumpMeta {
pub settings: Settings<Unchecked>,
pub primary_key: Option<String>,
}
#[derive(Deserialize, Debug, Clone, PartialEq, Eq)]
#[cfg_attr(test, derive(serde::Serialize))]
pub struct IndexUid(pub String);
impl TryFrom<String> for IndexUid {
type Error = IndexUidFormatError;
fn try_from(uid: String) -> Result<Self, Self::Error> {
if !uid
.chars()
.all(|x| x.is_ascii_alphanumeric() || x == '-' || x == '_')
|| uid.is_empty()
|| uid.len() > 400
{
Err(IndexUidFormatError { invalid_uid: uid })
} else {
Ok(IndexUid(uid))
}
}
}
impl FromStr for IndexUid {
type Err = IndexUidFormatError;
fn from_str(uid: &str) -> Result<IndexUid, IndexUidFormatError> {
uid.to_string().try_into()
}
}
impl From<IndexUid> for String {
fn from(uid: IndexUid) -> Self {
uid.into_inner()
}
}
#[derive(Debug)]
pub struct IndexUidFormatError {
pub invalid_uid: String,
}
impl Display for IndexUidFormatError {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
write!(
f,
"invalid index uid `{}`, the uid must be an integer \
or a string containing only alphanumeric characters \
a-z A-Z 0-9, hyphens - and underscores _.",
self.invalid_uid,
)
}
}
impl std::error::Error for IndexUidFormatError {}
/// A type that tries to match either a star (*) or
/// any other thing that implements `FromStr`.
#[derive(Debug)]
#[cfg_attr(test, derive(serde::Serialize))]
pub enum StarOr<T> {
Star,
Other(T),
}
impl<'de, T, E> Deserialize<'de> for StarOr<T>
where
T: FromStr<Err = E>,
E: Display,
{
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
/// Serde can't differentiate between `StarOr::Star` and `StarOr::Other` without a tag.
/// Simply using `#[serde(untagged)]` + `#[serde(rename="*")]` will lead to attempting to
/// deserialize everything as a `StarOr::Other`, including "*".
/// [`#[serde(other)]`](https://serde.rs/variant-attrs.html#other) might have helped but is
/// not supported on untagged enums.
struct StarOrVisitor<T>(PhantomData<T>);
impl<'de, T, FE> Visitor<'de> for StarOrVisitor<T>
where
T: FromStr<Err = FE>,
FE: Display,
{
type Value = StarOr<T>;
fn expecting(&self, formatter: &mut Formatter) -> std::fmt::Result {
formatter.write_str("a string")
}
fn visit_str<SE>(self, v: &str) -> Result<Self::Value, SE>
where
SE: serde::de::Error,
{
match v {
"*" => Ok(StarOr::Star),
v => {
let other = FromStr::from_str(v).map_err(|e: T::Err| {
SE::custom(format!("Invalid `other` value: {}", e))
})?;
Ok(StarOr::Other(other))
}
}
}
}
deserializer.deserialize_str(StarOrVisitor(PhantomData))
}
}