coinnect 0.5.12

A Rust library to connect to various crypto-currencies exchanges.
Documentation 
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//! Use this module to interact with Poloniex through a Generic API.
//! This a more convenient and safe way to deal with the exchange since methods return a Result<>
//! but this generic API does not provide all the functionnality that Poloniex offers.

use exchange::ExchangeApi;
use poloniex::api::PoloniexApi;

use bigdecimal::BigDecimal;
use std::str::FromStr;

use error::*;
use types::*;
use poloniex::utils;
use helpers;

impl ExchangeApi for PoloniexApi {
    fn ticker(&mut self, pair: Pair) -> Result<Ticker> {
        let pair_name = match utils::get_pair_string(&pair) {
            Some(name) => name,
            None => return Err(ErrorKind::PairUnsupported.into()),
        };
        let raw_response = self.return_ticker()?;

        let result = utils::parse_result(&raw_response)?;

        let price = helpers::from_json_bigdecimal(&result[*pair_name]["last"], "last")?;
        let ask = helpers::from_json_bigdecimal(&result[*pair_name]["lowestAsk"], "lowestAsk")?;
        let bid = helpers::from_json_bigdecimal(&result[*pair_name]["highestBid"], "highestBid")?;
        let vol = helpers::from_json_bigdecimal(&result[*pair_name]["quoteVolume"], "quoteVolume")?;

        Ok(Ticker {
            timestamp: helpers::get_unix_timestamp_ms(),
            pair: pair,
            last_trade_price: price,
            lowest_ask: ask,
            highest_bid: bid,
            volume: Some(vol),
        })
    }

    fn orderbook(&mut self, pair: Pair) -> Result<Orderbook> {
        let pair_name = match utils::get_pair_string(&pair) {
            Some(name) => name,
            None => return Err(ErrorKind::PairUnsupported.into()),
        };
        let raw_response = self.return_order_book(pair_name, "1000")?; // 1000 entries max

        let result = utils::parse_result(&raw_response)?;

        let mut ask_offers = Vec::new();
        let mut bid_offers = Vec::new();

        let ask_array = result["asks"]
            .as_array()
            .ok_or_else(|| ErrorKind::InvalidFieldFormat(format!("{}", result["asks"])))?;
        let bid_array = result["bids"]
            .as_array()
            .ok_or_else(|| ErrorKind::InvalidFieldFormat(format!("{}", result["asks"])))?;

        for ask in ask_array {
            let price = helpers::from_json_bigdecimal(&ask[0], "ask price")?;
            let volume_str = ask[1].as_f64().unwrap().to_string();
            let volume = BigDecimal::from_str(&volume_str).unwrap();

            ask_offers.push((price, volume));
        }

        for bid in bid_array {
            let price = helpers::from_json_bigdecimal(&bid[0], "bid price")?;
            let volume_str = bid[1].as_f64().unwrap().to_string();
            let volume = BigDecimal::from_str(&volume_str).unwrap();

            bid_offers.push((price, volume));
        }

        Ok(Orderbook {
            timestamp: helpers::get_unix_timestamp_ms(),
            pair: pair,
            asks: ask_offers,
            bids: bid_offers,
        })
    }

    fn add_order(&mut self, order_type: OrderType, pair: Pair, quantity: Volume, price: Option<Price>) -> Result<OrderInfo> {
        let pair_name = match utils::get_pair_string(&pair) {
            Some(name) => name,
            None => return Err(ErrorKind::PairUnsupported.into()),
        };

        // The trick is to use minimal (0.0) and "maximum" (999..) price to simulate market order
        let raw_response = match order_type {
            // Unwrap safe here with the check above.
            OrderType::BuyLimit => {
                if price.is_none() {
                    return Err(ErrorKind::MissingPrice.into());
                }

                self.buy(
                    pair_name,
                    &price.unwrap().to_string(),
                    &quantity.to_string(),
                    None,
                )
            }
            OrderType::BuyMarket => self.buy(
                pair_name,
                "9999999999999999999",
                &quantity.to_string(),
                None,
            ),
            OrderType::SellLimit => {
                if price.is_none() {
                    return Err(ErrorKind::MissingPrice.into());
                }

                self.sell(
                    pair_name,
                    &price.unwrap().to_string(),
                    &quantity.to_string(),
                    None,
                )
            }
            OrderType::SellMarket => self.sell(pair_name, "0.0", &quantity.to_string(), None),
        }?;

        let result = utils::parse_result(&raw_response)?;

        Ok(OrderInfo {
            timestamp: helpers::get_unix_timestamp_ms(),
            identifier: vec![
                result["orderNumber"]
                    .as_f64()
                    .ok_or_else(|| ErrorKind::MissingField("orderNumber".to_string()))?
                    .to_string(),
            ],
        })
    }

    fn balances(&mut self) -> Result<Balances> {
        let raw_response = self.return_balances()?;
        let result = utils::parse_result(&raw_response)?;

        let mut balances = Balances::new();

        for (key, val) in result.iter() {
            let currency = utils::get_currency_enum(key);

            if currency.is_some() {
                let amount = helpers::from_json_bigdecimal(&val, "amount")?;
                balances.insert(currency.unwrap(), amount);
            }
        }
        Ok(balances)
    }
}