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serializer.rs
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serializer.rs
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use std::any::{Any, type_name};
use std::fmt::{Debug, Display, Formatter};
use bytes::Bytes;
use serde::{Deserialize, Serialize};
use crate::api::ToStruct;
use crate::request::ResponseStatus;
use dce_util::mixed::{DceErr, DceResult};
use dce_util::mem::self_transmute;
#[derive(Debug)]
pub enum Serializable<Dto> {
Dto(Dto),
Status(ResponseStatus<Dto>),
}
#[derive(Debug)]
pub enum Serialized {
String(String),
Bytes(Bytes),
}
impl Serialized {
pub fn unwrap<T: 'static>(self) -> T {
match self {
Serialized::String(v) => self_transmute::<String, T>(v),
Serialized::Bytes(v) => self_transmute::<Bytes, T>(v),
}
}
}
impl Display for Serialized {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
f.write_str(&match self {
Serialized::String(str) => str.to_string(),
Serialized::Bytes(bytes) => String::from_utf8_lossy(bytes).to_string(),
})
}
}
pub trait Deserializer<Dto> {
fn deserialize<'a>(&self, value: Serialized) -> DceResult<Dto>;
}
pub trait Serializer<Dto> {
fn serialize(&self, value: Serializable<Dto>) -> DceResult<Serialized>;
}
// 无用序列器,用于不解析或不序列化的请求数据,默认序列器
/// unreachable serializer, just for no parse or no serialize request data, default serializer
pub struct UnreachableSerializer;
impl<Dto> Deserializer<Dto> for UnreachableSerializer {
fn deserialize<'a>(&self, _: Serialized) -> DceResult<Dto> {
panic!("missing serializer in api configuration, or try not using a serializable Request")
}
}
impl<Dto> Serializer<Dto> for UnreachableSerializer {
fn serialize(&self, _: Serializable<Dto>) -> DceResult<Serialized> {
panic!("missing serializer in api configuration, or do not try respond in a not responsible Request")
}
}
impl ToStruct for UnreachableSerializer {
fn from<const N: usize>(_: [(&str, Box<dyn Any>); N]) -> Self {
UnreachableSerializer
}
}
pub struct StringSerializer;
impl<Dto: From<Serialized>> Deserializer<Dto> for StringSerializer {
fn deserialize<'a>(&self, value: Serialized) -> DceResult<Dto> {
Ok(Dto::from(value))
}
}
impl<Dto: Into<Serialized> + 'static> Serializer<Dto> for StringSerializer {
fn serialize(&self, value: Serializable<Dto>) -> DceResult<Serialized> {
Ok(match value {
Serializable::Dto(v) => v.into(),
Serializable::Status(s) => Serialized::String((if s.status { "succeeded" } else { "failed" }).to_string())
})
}
}
impl ToStruct for StringSerializer {
fn from<const N: usize>(_: [(&str, Box<dyn Any>); N]) -> Self {
StringSerializer
}
}
pub struct JsonSerializer {
}
impl<Dto: for<'a> Deserialize<'a>> Deserializer<Dto> for JsonSerializer {
fn deserialize<'a>(&self, value: Serialized) -> DceResult<Dto> {
Ok((match value {
Serialized::String(v) => serde_json::from_str(v.as_str()),
Serialized::Bytes(v) => serde_json::from_slice(v.as_ref()),
}).or(Err(DceErr::closed(0, "Serialized cannot deserialize to ReqDto".to_owned())))?)
}
}
impl<Dto: Serialize + 'static> Serializer<Dto> for JsonSerializer {
fn serialize(&self, value: Serializable<Dto>) -> DceResult<Serialized> {
Ok(Serialized::String(match value {
Serializable::Dto(v) => serde_json::to_string::<Dto>(&v),
Serializable::Status(v) => serde_json::to_string::<ResponseStatus<Dto>>(&v),
}.or(Err(DceErr::closed(0, "RespDto not a jsonable".to_owned())))?))
}
}
impl ToStruct for JsonSerializer {
fn from<const N: usize>(_: [(&str, Box<dyn Any>); N]) -> Self {
JsonSerializer {}
}
}
impl<Dto> Debug for dyn Deserializer<Dto> + Send + Sync {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
f.write_str(format!("Deserializer: {}{{}}", type_name::<Self>()).as_str())
}
}
impl<Dto> Debug for dyn Serializer<Dto> + Send + Sync {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
f.write_str(format!("Serializer: {}{{}}", type_name::<Self>()).as_str())
}
}