serde.rs

// This file simply re-exports some methods from serde_json
// The reason is two fold:
// 1. To easily ensure that all calling libraries use the same version (minimize code size)
// 2. To allow us to switch out to eg. serde-json-core more easily
use serde::{de::DeserializeOwned, Serialize};
use std::any::type_name;

use crate::binary::Binary;
use crate::errors::{StdError, StdResult};

pub fn from_slice<T: DeserializeOwned>(value: &[u8]) -> StdResult<T> {
    serde_json_wasm::from_slice(value).map_err(|e| StdError::parse_err(type_name::<T>(), e))
}

pub fn from_binary<T: DeserializeOwned>(value: &Binary) -> StdResult<T> {
    from_slice(value.as_slice())
}

pub fn to_vec<T>(data: &T) -> StdResult<Vec<u8>>
where
    T: Serialize + ?Sized,
{
    serde_json_wasm::to_vec(data).map_err(|e| StdError::serialize_err(type_name::<T>(), e))
}

pub fn to_binary<T>(data: &T) -> StdResult<Binary>
where
    T: Serialize + ?Sized,
{
    to_vec(data).map(Binary)
}

#[cfg(test)]
mod tests {
    use super::*;
    use serde::Deserialize;

    #[derive(Serialize, Deserialize, Debug, PartialEq)]
    #[serde(rename_all = "snake_case")]
    enum SomeMsg {
        Refund {},
        ReleaseAll {
            image: String,
            amount: u32,
            time: u64,
            karma: i32,
        },
        Cowsay {
            text: String,
        },
    }

    #[test]
    fn to_vec_works() {
        let msg = SomeMsg::Refund {};
        let serialized = to_vec(&msg).unwrap();
        assert_eq!(serialized, br#"{"refund":{}}"#);

        let msg = SomeMsg::ReleaseAll {
            image: "foo".to_string(),
            amount: 42,
            time: 9007199254740999, // Number.MAX_SAFE_INTEGER + 7
            karma: -17,
        };
        let serialized = String::from_utf8(to_vec(&msg).unwrap()).unwrap();
        assert_eq!(
            serialized,
            r#"{"release_all":{"image":"foo","amount":42,"time":9007199254740999,"karma":-17}}"#
        );
    }

    #[test]
    fn from_slice_works() {
        let deserialized: SomeMsg = from_slice(br#"{"refund":{}}"#).unwrap();
        assert_eq!(deserialized, SomeMsg::Refund {});

        let deserialized: SomeMsg = from_slice(
            br#"{"release_all":{"image":"foo","amount":42,"time":18446744073709551615,"karma":-17}}"#,
        )
        .unwrap();
        assert_eq!(
            deserialized,
            SomeMsg::ReleaseAll {
                image: "foo".to_string(),
                amount: 42,
                time: 18446744073709551615,
                karma: -17
            }
        );
    }

    #[test]
    fn from_slice_or_binary() {
        let msg = SomeMsg::Refund {};
        let serialized: Binary = to_binary(&msg).unwrap();

        let parse_binary: SomeMsg = from_binary(&serialized).unwrap();
        assert_eq!(parse_binary, msg);

        let parse_slice: SomeMsg = from_slice(&serialized).unwrap();
        assert_eq!(parse_slice, msg);
    }

    #[test]
    fn to_vec_works_for_special_chars() {
        let msg = SomeMsg::Cowsay {
            text: "foo\"bar\\\"bla".to_string(),
        };
        let serialized = String::from_utf8(to_vec(&msg).unwrap()).unwrap();
        assert_eq!(serialized, r#"{"cowsay":{"text":"foo\"bar\\\"bla"}}"#);
    }

    #[test]
    fn from_slice_works_for_special_chars() {
        let deserialized: SomeMsg =
            from_slice(br#"{"cowsay":{"text":"foo\"bar\\\"bla"}}"#).unwrap();
        assert_eq!(
            deserialized,
            SomeMsg::Cowsay {
                text: "foo\"bar\\\"bla".to_string(),
            }
        );
    }
}