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use primitive_types::U256;
use serde::{self, Deserialize, Deserializer, Serializer};
use serde_with::{DeserializeAs, SerializeAs};
pub fn serialize<S>(x: &U256, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
serializer.serialize_str(&format!("0x{:x}", *x))
}
pub fn deserialize<'de, D>(deserializer: D) -> Result<U256, D::Error>
where
D: Deserializer<'de>,
{
let s = String::deserialize(deserializer)?;
let s = s.trim_start_matches("0x");
U256::from_str_radix(&s, 16).map_err(serde::de::Error::custom)
}
pub struct Hex0xU256(U256);
impl SerializeAs<U256> for Hex0xU256 {
fn serialize_as<S>(x: &U256, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
serializer.serialize_str(&format!("0x{:x}", *x))
}
}
impl<'de> DeserializeAs<'de, U256> for Hex0xU256 {
fn deserialize_as<D>(deserializer: D) -> Result<U256, D::Error>
where
D: Deserializer<'de>,
{
let s = String::deserialize(deserializer)?;
let s = s.trim_start_matches("0x");
U256::from_str_radix(&s, 16).map_err(serde::de::Error::custom)
}
}
#[test]
fn test_custom_de_serializer() {
use serde::Serialize;
use serde_with::serde_as;
#[serde_as]
#[derive(Debug, Serialize, Deserialize, PartialEq, Eq, Clone)]
struct Data {
#[serde_as(as = "Vec<Hex0xU256>")]
data: Vec<U256>,
}
let d = Data {
data: vec![
U256::from_dec_str("123").unwrap(),
U256::from_dec_str("123").unwrap(),
],
};
let yaml_encoded = serde_yaml::to_string(&d).unwrap();
println!("yaml_encoded:\n{}", yaml_encoded);
let yaml_decoded = serde_yaml::from_str(&yaml_encoded).unwrap();
assert_eq!(d, yaml_decoded);
let json_encoded = serde_json::to_string(&d).unwrap();
println!("json_encoded:\n{}", json_encoded);
let json_decoded = serde_json::from_str(&json_encoded).unwrap();
assert_eq!(d, json_decoded);
let json_decoded_2: Data = serde_json::from_str(
"
{
\"data\":[\"0x7b\", \"0x7b\"]
}
",
)
.unwrap();
assert_eq!(d, json_decoded_2);
}