web3 0.1.0

Ethereum JSON-RPC client.
Documentation 
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use types::{Address, U256, Bytes};

/// Call contract request (eth_call / eth_estimateGas)
#[derive(Clone, Debug, PartialEq, Serialize)]
pub struct CallRequest {
  /// Sender address (None for arbitrary address)
  #[serde(skip_serializing_if="Option::is_none")]
  pub from: Option<Address>,
  /// To address
  pub to: Address,
  /// Supplied gas (None for sensible default)
  #[serde(skip_serializing_if="Option::is_none")]
  pub gas: Option<U256>,
  /// Gas price (None for sensible default)
  #[serde(skip_serializing_if="Option::is_none")]
  #[serde(rename = "gasPrice")]
  pub gas_price: Option<U256>,
  /// Transfered value (None for no transfer)
  #[serde(skip_serializing_if="Option::is_none")]
  pub value: Option<U256>,
  /// Data (None for empty data)
  #[serde(skip_serializing_if="Option::is_none")]
  pub data: Option<Bytes>,
}

/// Send Transaction Parameters
#[derive(Clone, Debug, PartialEq, Serialize)]
pub struct TransactionRequest {
  /// Sender address
  pub from: Address,
  /// Recipient address (None for contract creation)
  #[serde(skip_serializing_if="Option::is_none")]
  pub to: Option<Address>,
  /// Supplied gas (None for sensible default)
  #[serde(skip_serializing_if="Option::is_none")]
  pub gas: Option<U256>,
  /// Gas price (None for sensible default)
  #[serde(skip_serializing_if="Option::is_none")]
  #[serde(rename = "gasPrice")]
  pub gas_price: Option<U256>,
  /// Transfered value (None for no transfer)
  #[serde(skip_serializing_if="Option::is_none")]
  pub value: Option<U256>,
  /// Transaction data (None for empty bytes)
  #[serde(skip_serializing_if="Option::is_none")]
  pub data: Option<Bytes>,
  /// Transaction nonce (None for next available nonce)
  #[serde(skip_serializing_if="Option::is_none")]
  pub nonce: Option<U256>,
  /// Min block inclusion (None for include immediately)
  #[serde(skip_serializing_if="Option::is_none")]
  pub condition: Option<TransactionCondition>,
}

/// Represents condition on minimum block number or block timestamp.
#[derive(Debug, Clone, Eq, PartialEq, Hash, Serialize, Deserialize)]
#[serde(deny_unknown_fields)]
pub enum TransactionCondition {
	/// Valid at this minimum block number.
	#[serde(rename="block")]
	Block(u64),
	/// Valid at given unix time.
	#[serde(rename="time")]
	Timestamp(u64),
}

#[cfg(test)]
mod tests {
  use serde_json;
  use super::{CallRequest, TransactionRequest, TransactionCondition};

  #[test]
  fn should_serialize_call_request() {
    // given
    let call_request = CallRequest {
      from: None,
      to: 5.into(),
      gas: Some(21_000.into()),
      gas_price: None,
      value: Some(5_000_000.into()),
      data: Some(vec![1, 2, 3].into()),
    };

    // when
    let serialized = serde_json::to_string_pretty(&call_request).unwrap();

    // then
    assert_eq!(serialized,
r#"{
  "to": "0x0000000000000000000000000000000000000005",
  "gas": "0x5208",
  "value": "0x4c4b40",
  "data": "0x010203"
}"#);
  }

  #[test]
  fn should_serialize_transaction_request() {
    // given
    let tx_request = TransactionRequest {
      from: 5.into(),
      to: None,
      gas: Some(21_000.into()),
      gas_price: None,
      value: Some(5_000_000.into()),
      data: Some(vec![1, 2, 3].into()),
      nonce: None,
      condition: Some(TransactionCondition::Block(5)),
    };

    // when
    let serialized = serde_json::to_string_pretty(&tx_request).unwrap();

    // then
    assert_eq!(serialized,
r#"{
  "from": "0x0000000000000000000000000000000000000005",
  "gas": "0x5208",
  "value": "0x4c4b40",
  "data": "0x010203",
  "condition": {
    "block": 5
  }
}"#);
  }
}