rs_limitless 0.1.1

Limitless Exchange API bindings in Rust — prediction market trading, HMAC authentication, EIP-712 signing, and WebSocket streams.
Documentation 
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use crate::prelude::*;

/// Deserialize a string as `Option<f64>`, treating empty strings as `None`.
///
/// The Limitless API sometimes returns empty strings for optional numeric
/// fields. This module handles that gracefully.
pub mod string_to_float_optional {
    use super::*;

    pub fn serialize<S>(value: &Option<f64>, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        match value {
            Some(v) => serializer.serialize_str(&v.to_string()),
            None => serializer.serialize_str(""),
        }
    }

    pub fn deserialize<'de, D>(deserializer: D) -> Result<Option<f64>, D::Error>
    where
        D: Deserializer<'de>,
    {
        let s: Option<String> = Option::deserialize(deserializer)?;
        match s {
            Some(s) if s.trim().is_empty() => Ok(None),
            Some(s) => f64::from_str(&s)
                .map(Some)
                .map_err(serde::de::Error::custom),
            None => Ok(None),
        }
    }
}

/// Deserialize a string as `f64`.
///
/// The Limitless API returns many numeric values (prices, amounts) as strings
/// to preserve precision. This converts them to `f64`.
pub mod string_to_float {
    use super::*;

    pub fn serialize<S>(value: &f64, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        serializer.serialize_str(&value.to_string())
    }

    pub fn deserialize<'de, D>(deserializer: D) -> Result<f64, D::Error>
    where
        D: Deserializer<'de>,
    {
        let s = String::deserialize(deserializer)?;
        s.parse::<f64>().map_err(serde::de::Error::custom)
    }
}

/// Deserialize a string as `u64`.
pub mod string_to_u64 {
    use super::*;

    pub fn serialize<S>(value: &u64, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        serializer.serialize_str(&value.to_string())
    }

    pub fn deserialize<'de, D>(deserializer: D) -> Result<u64, D::Error>
    where
        D: Deserializer<'de>,
    {
        let s = String::deserialize(deserializer)?;
        s.parse::<u64>().map_err(serde::de::Error::custom)
    }
}

/// Deserialize a string as `Option<u64>`, treating empty strings as `None`.
pub mod string_to_u64_optional {
    use super::*;

    pub fn serialize<S>(value: &Option<u64>, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        match value {
            Some(v) => serializer.serialize_str(&v.to_string()),
            None => serializer.serialize_str(""),
        }
    }

    pub fn deserialize<'de, D>(deserializer: D) -> Result<Option<u64>, D::Error>
    where
        D: Deserializer<'de>,
    {
        let s: Option<String> = Option::deserialize(deserializer)?;
        match s {
            Some(s) if s.trim().is_empty() => Ok(None),
            Some(s) => u64::from_str(&s)
                .map(Some)
                .map_err(serde::de::Error::custom),
            None => Ok(None),
        }
    }
}

/// Treat empty strings as `None` for any `Deserialize` type.
pub fn empty_string_as_none<'de, D, T>(deserializer: D) -> Result<Option<T>, D::Error>
where
    D: Deserializer<'de>,
    T: Deserialize<'de>,
{
    let s: Option<String> = Option::deserialize(deserializer)?;
    match s {
        Some(ref s) if s.trim().is_empty() => Ok(None),
        Some(s) => {
            let kind = T::deserialize(serde_json::Value::String(s))
                .map(Some)
                .map_err(serde::de::Error::custom)?;
            Ok(kind)
        }
        None => Ok(None),
    }
}