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extern crate serde;
use serde::ser::{Serialize, Serializer, SerializeStruct};
use std::borrow::Cow;
#[cfg(test)]
#[cfg_attr(test, macro_use)]
extern crate serde_json;
#[cfg(test)]
extern crate serde_derive;
pub enum JTableResponse<'e, T> {
Ok(Action<T>),
Err(Cow<'e, str>)
}
pub enum Action<T> {
List(Vec<T>),
Create(T),
Update,
Delete
}
impl<T> Action<T> where T: Serialize {
fn ser<S: SerializeStruct>(&self, s: &mut S) -> Result<(), S::Error> {
use Action::*;
match self {
Update | Delete => {},
Create(r) => s.serialize_field("Record", r)?,
List(l) => s.serialize_field("Records", l)?
}
Ok(())
}
}
impl<'e, T> serde::Serialize for JTableResponse<'e, T> where T: Serialize {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where S: Serializer {
let mut ser_struct = serializer.serialize_struct("response", 2)?;
match self {
JTableResponse::Ok(value) => {
ser_struct.serialize_field("Result", "OK")?;
value.ser(&mut ser_struct)?;
},
JTableResponse::Err(msg) => {
ser_struct.serialize_field("Result", "ERROR")?;
ser_struct.serialize_field("Message", msg)?;
}
}
ser_struct.end()
}
}
#[cfg(test)]
mod tests {
use super::*;
use serde_derive::{Deserialize, Serialize};
#[test]
fn serialize_list() {
#[derive(Deserialize, Serialize)]
struct Project {
name: String,
version: u32,
contributors: Vec<String>,
}
assert_eq!(
serde_json::to_value(
JTableResponse::Ok(
Action::List(vec![
Project {
name: "Rust".to_string(),
version: 2018,
contributors: vec!["brson".to_string()]
}
])
)
).unwrap(),
json!({
"Result": "OK",
"Records": [{
"name": "Rust",
"version": 2018,
"contributors": ["brson"]
}]
})
);
assert_eq!(
serde_json::to_value(
JTableResponse::Err::<Project>("Requested entry violates constraints".into())
).unwrap(),
json!({"Result": "ERROR", "Message": "Requested entry violates constraints"})
);
assert_eq!(
serde_json::to_value(
JTableResponse::Ok(
Action::Create(Some(Project{name: "jtable".to_string(), version: 1, contributors: vec![]}))
)
).unwrap(),
json!({"Result": "OK", "Record": {"name": "jtable", "version": 1, "contributors": []}})
);
}
}