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//!
//! This is a minimal interface for the [Kraken exchange REST API](https://docs.kraken.com/rest/) using the [async-std](https://async.rs/) runtime.
//!
//! Being a minimal interface for the API there is just a single method which takes the endpoint name and the parameters as a [Value](https://docs.serde.rs/serde_json/value/enum.Value.html) object from [serde_json](https://docs.serde.rs/serde_json/).
//!
//! When querying a private endpoint this library will handle and properly sing the petition to Kraken.
//!
//! # Prerequisites
//! To use the **```private```** endpoints you will need to generate an **```API-Key```** and an **```API-Secret```** to authenticate to the desired Kraken account.
//! [How to generate an API key pair?](https://support.kraken.com/hc/en-us/articles/360000919966-How-to-generate-an-API-key-pair-)
//!
//! # Usage
//! Create the ``KrakenClient`` object with ``new()`` or ``with_credentials(key, secret)`` based on your needs.
//!
//! Then call ``api_request(endpoint_name, payload)``. It will return a JSON for you to handle or an error message. You can read about the payload for each endpoint and the returned JSON in the [API documentation](https://docs.kraken.com/rest/).
//!
//! Available **Public** Endpoint Names:
//! [Time](https://docs.kraken.com/rest/#operation/getServerTime),
//! [SystemStatus](https://docs.kraken.com/rest/#operation/getSystemStatus),
//! [Assets](https://docs.kraken.com/rest/#operation/getAssetInfo),
//! [AssetPairs](https://docs.kraken.com/rest/#operation/getTradableAssetPairs),
//! [Ticker](https://docs.kraken.com/rest/#operation/getTickerInformation),
//! [OHLC](https://docs.kraken.com/rest/#operation/getOHLCData),
//! [Depth](https://docs.kraken.com/rest/#operation/getOrderBook),
//! [Trades](https://docs.kraken.com/rest/#operation/getRecentTrades),
//! [Spread](https://docs.kraken.com/rest/#operation/getRecentSpreads).
//!
//! Available **Private** Endpoint Names:
//! *User Data*
//! [Balance](https://docs.kraken.com/rest/#operation/getAccountBalance),
//! [TradeBalance](https://docs.kraken.com/rest/#operation/getTradeBalance),
//! [OpenOrders](https://docs.kraken.com/rest/#operation/getOpenOrders),
//! [ClosedOrders](https://docs.kraken.com/rest/#operation/getClosedOrders),
//! [QueryOrders](https://docs.kraken.com/rest/#operation/getOrdersInfo),
//! [TradesHistory](https://docs.kraken.com/rest/#operation/getTradeHistory),
//! [QueryTrades](https://docs.kraken.com/rest/#operation/getTradesInfo),
//! [OpenPositions](https://docs.kraken.com/rest/#operation/getOpenPositions),
//! [Ledgers](https://docs.kraken.com/rest/#operation/getLedgers),
//! [QueryLedgers](https://docs.kraken.com/rest/#operation/getLedgersInfo),
//! [TradeVolume](https://docs.kraken.com/rest/#operation/getTradeVolume),
//! [AddExport](https://docs.kraken.com/rest/#operation/addExport),
//! [ExportStatus](https://docs.kraken.com/rest/#operation/exportStatus),
//! [RetrieveExport](https://docs.kraken.com/rest/#operation/retrieveExport),
//! [RemoveExport](https://docs.kraken.com/rest/#operation/removeExport).
//!
//! *User Trading*
//! [AddOrder](https://docs.kraken.com/rest/#operation/addOrder)
//! [CancelOrder](https://docs.kraken.com/rest/#operation/cancelOrder)
//! [CancellAll](https://docs.kraken.com/rest/#operation/cancelAllOrders)
//! [CancelAllOrdersAfter](https://docs.kraken.com/rest/#operation/cancelAllOrdersAfter).
//!
//! *User Funding*
//! [DepositMethods](https://docs.kraken.com/rest/#operation/getDepositMethods),
//! [DepositAddresses](https://docs.kraken.com/rest/#operation/getDepositAddresses),
//! [DepositStatus](https://docs.kraken.com/rest/#operation/getStatusRecentDeposits),
//! [WithdrawInfo](https://docs.kraken.com/rest/#operation/getWithdrawalInformation),
//! [Withdraw](https://docs.kraken.com/rest/#operation/withdrawFunds),
//! [WithdrawStatus](https://docs.kraken.com/rest/#operation/getStatusRecentWithdrawals),
//! [WithdrawCancel](https://docs.kraken.com/rest/#operation/cancelWithdrawal),
//! [WalletTransfer](https://docs.kraken.com/rest/#operation/walletTransfer).
//!
//! *Websocket Auth*
//! [GetWebSocketsToken](https://docs.kraken.com/rest/#operation/getWebsocketsToken).
//!
//! # Example
//! ```rust
//! use async_kraken::client::KrakenClient;
//!
//! fn get_keys() -> (String, String) {
//! let content = std::fs::read_to_string("key").expect("File not found");
//! let lines: Vec<&str> = content.lines().collect();
//!
//! let key = String::from(lines[0]);
//! let secret = String::from(lines[1]);
//!
//! (key, secret)
//! }
//!
//! #[async_std::main]
//! async fn main() {
//! // # Only public endpoints
//! // let k = KrakenClient::new();
//!
//! // # Public and private enpoints
//! let (key, secret) = get_keys();
//! let k = KrakenClient::with_credentials(key, secret);
//!
//! match k.api_request("Time", serde_json::json!({})).await {
//! Ok(json) => println!("{:?}", json),
//! Err(e) => println!("{:?}", e),
//! };
//!
//! match k.api_request("OHLC", serde_json::json!({"pair":"doteur", "interval":30, "since":0})).await
//! {
//! Ok(json) => println!("{:?}", json),
//! Err(e) => println!("{:?}", e),
//! };
//!
//! match k.api_request("Balance", serde_json::json!({})).await {
//! Ok(json) => println!("{:?}", json),
//! Err(e) => println!("{:?}", e),
//! };
//! }
//! ```
//! # Disclaimer
//! This software comes without any kind of warranties.
//! You are the sole responsible of your gains or loses.
//!
use Deserialize;
use Value;
use ;