web3 0.1.0

Ethereum JSON-RPC client.
Documentation 
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use std::fmt;
use serde::{Serialize, Serializer, Deserialize, Deserializer};
use serde::de::{Error, Visitor};
use rustc_serialize::hex::{FromHex, ToHex};

/// Raw bytes wrapper
#[derive(Clone, Debug, Default, PartialEq)]
pub struct Bytes(pub Vec<u8>);

impl<T: Into<Vec<u8>>> From<T> for Bytes {
  fn from(data: T) -> Self {
    Bytes(data.into())
  }
}

impl Serialize for Bytes {
  fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where S: Serializer {
    let mut serialized = "0x".to_owned();
    serialized.push_str(self.0.to_hex().as_ref());
    serializer.serialize_str(serialized.as_ref())
  }
}

impl<'a> Deserialize<'a> for Bytes {
  fn deserialize<D>(deserializer: D) -> Result<Bytes, D::Error>
    where D: Deserializer<'a> {
    deserializer.deserialize_identifier(BytesVisitor)
  }
}

struct BytesVisitor;

impl<'a> Visitor<'a> for BytesVisitor {
  type Value = Bytes;

  fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
    write!(formatter, "a 0x-prefixed hex-encoded vector of bytes")
  }

  fn visit_str<E>(self, value: &str) -> Result<Self::Value, E> where E: Error {
    if value.len() >= 2 && &value[0..2] == "0x" && value.len() & 1 == 0 {
      Ok(Bytes(FromHex::from_hex(&value[2..]).map_err(|_| Error::custom("invalid hex"))?))
    } else {
      Err(Error::custom("invalid format"))
    }
  }

  fn visit_string<E>(self, value: String) -> Result<Self::Value, E> where E: Error {
    self.visit_str(value.as_ref())
  }
}