web3 0.1.0

Ethereum JSON-RPC client.
Documentation 
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use serde::{Serialize, Serializer, Deserialize, Deserializer};
use serde::de::Error;
use serde_json::{self, Value};
use types::{U256, H256};

/// Miner's work package
#[derive(Debug, PartialEq, Eq)]
pub struct Work {
  /// The proof-of-work hash.
  pub pow_hash: H256,
  /// The seed hash.
  pub seed_hash: H256,
  /// The target.
  pub target: H256,
  /// The block number: this isn't always stored.
  pub number: Option<u64>,
}

impl<'a> Deserialize<'a> for Work {
  fn deserialize<D>(deserializer: D) -> Result<Work, D::Error> where D: Deserializer<'a> {
    let v: Value = Deserialize::deserialize(deserializer)?;

    let (pow_hash, seed_hash, target, number) = serde_json::from_value::<(H256, H256, H256, u64)>(v.clone())
      .map(|(pow_hash, seed_hash, target, number)| (pow_hash, seed_hash, target, Some(number)))
      .or_else(|_| {
        serde_json::from_value::<(H256, H256, H256)>(v)
          .map(|(pow_hash, seed_hash, target)| (pow_hash, seed_hash, target, None))
      })
      .map_err(|e| D::Error::custom(format!("Cannot deserialize Work: {:?}", e)))?;

    Ok(Work {
      pow_hash: pow_hash,
      seed_hash: seed_hash,
      target: target,
      number: number,
    })
  }
}

impl Serialize for Work {
  fn serialize<S>(&self, s: S) -> Result<S::Ok, S::Error> where S: Serializer {
    match self.number.as_ref() {
      Some(num) => (&self.pow_hash, &self.seed_hash, &self.target, U256::from(*num)).serialize(s),
      None => (&self.pow_hash, &self.seed_hash, &self.target).serialize(s),
    }
  }
}