1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167

use crate::{clients::utils::CHANNEL_PAIR_DELIMITER, WSClient};
use std::collections::HashMap;
use std::sync::{Arc, Mutex};
use std::time::{SystemTime, UNIX_EPOCH};

use super::super::ws_client_internal::{MiscMessage, WSClientInternal};
use super::super::{Candlestick, OrderBook, OrderBookSnapshot, Ticker, Trade, BBO};

use log::*;
use serde_json::Value;

const EXCHANGE_NAME: &str = "bitz";

const WEBSOCKET_URL: &str = "wss://wsapi.bitz.plus/";

// See https://apidocv2.bitz.plus/en/#heartbeat-and-persistent-connection-strategy
const CLIENT_PING_INTERVAL_AND_MSG: (u64, &str) = (10, "ping");

/// The WebSocket client for Bitz spot market.
///
/// * WebSocket API doc: <https://apidocv2.bitz.plus/en/#websocket-url>
/// * Trading at <https://www.bitz.plus/exchange>
pub struct BitzSpotWSClient<'a> {
    client: WSClientInternal<'a>,
}

fn pair_channels_to_command(pair: &str, channels: &[String], subscribe: bool) -> String {
    format!(
        r#"{{"action":"Topic.{}", "data":{{"symbol":"{}", "type":"{}", "_CDID":"100002", "dataType":"1"}}, "msg_id":{}}}"#,
        if subscribe { "sub" } else { "unsub" },
        pair,
        channels.join(","),
        SystemTime::now()
            .duration_since(UNIX_EPOCH)
            .unwrap()
            .as_millis(),
    )
}

fn channels_to_commands(channels: &[String], subscribe: bool) -> Vec<String> {
    let mut all_commands: Vec<String> = channels
        .iter()
        .filter(|ch| ch.starts_with('{'))
        .map(|s| s.to_string())
        .collect();

    let mut pair_channels = HashMap::<String, Vec<String>>::new();
    for s in channels.iter().filter(|ch| !ch.starts_with('{')) {
        let v: Vec<&str> = s.split(CHANNEL_PAIR_DELIMITER).collect();
        let channel = v[0];
        let pair = v[1];
        match pair_channels.get_mut(pair) {
            Some(channels) => channels.push(channel.to_string()),
            None => {
                pair_channels.insert(pair.to_string(), vec![channel.to_string()]);
            }
        }
    }

    for (pair, channels) in pair_channels.iter() {
        all_commands.push(pair_channels_to_command(pair, channels, subscribe));
    }

    all_commands
}

fn on_misc_msg(msg: &str) -> MiscMessage {
    if msg == "pong" {
        return MiscMessage::Pong;
    }
    let obj = serde_json::from_str::<HashMap<String, Value>>(msg).unwrap();

    if obj.contains_key("action")
        && obj
            .get("action")
            .unwrap()
            .as_str()
            .unwrap()
            .starts_with("Pushdata.")
    {
        MiscMessage::Normal
    } else if obj.contains_key("status") {
        let status = obj.get("status").unwrap().as_i64().unwrap();
        // see https://apidocv2.bitz.plus/en/#error
        match status {
            -101001 => {
                error!("Subscription type parameter error: {}", msg);
                panic!("Subscription type parameter error: {}", msg);
            }
            -101002 => {
                error!("Fail to get subscribed symbol of trading pair: {}", msg);
                panic!("Fail to get subscribed symbol of trading pair: {}", msg);
            }
            -101003 => {
                error!("k-line scale resolution error: {}", msg);
                panic!("k-line scale resolution error: {}", msg);
            }
            _ => warn!("Received {} from {}", msg, EXCHANGE_NAME),
        }
        MiscMessage::Misc
    } else {
        warn!("Received {} from {}", msg, EXCHANGE_NAME);
        MiscMessage::Misc
    }
}

fn to_raw_channel(channel: &str, pair: &str) -> String {
    format!("{}{}{}", channel, CHANNEL_PAIR_DELIMITER, pair)
}

#[rustfmt::skip]
impl_trait!(Trade, BitzSpotWSClient, subscribe_trade, "order", to_raw_channel);
#[rustfmt::skip]
impl_trait!(OrderBook, BitzSpotWSClient, subscribe_orderbook, "depth", to_raw_channel);
#[rustfmt::skip]
impl_trait!(Ticker, BitzSpotWSClient, subscribe_ticker, "market", to_raw_channel);

impl<'a> BBO for BitzSpotWSClient<'a> {
    fn subscribe_bbo(&self, _pairs: &[String]) {
        panic!("Bitz does NOT have BBO channel");
    }
}

impl<'a> OrderBookSnapshot for BitzSpotWSClient<'a> {
    fn subscribe_orderbook_snapshot(&self, _pairs: &[String]) {
        panic!("Bitz does NOT have orderbook snapshot channel");
    }
}

fn to_candlestick_raw_channel(pair: &str, interval: u32) -> String {
    let interval_str = match interval {
        60 => "1min",
        300 => "5min",
        900 => "15min",
        1800 => "30min",
        3600 => "60min",
        14400 => "4hour",
        86400 => "1day",
        432000 => "5day",
        604800 => "1week",
        2592000 => "1mon",
        _ => panic!(
            "Bitz available intervals 1min,5min,15min,30min,60min,4hour,1day,5day,1week,1mon"
        ),
    };
    format!(
        r#"{{"action":"Topic.sub", "data":{{"symbol":"{}", "type":"kline", "resolution":"{}", "_CDID":"100002", "dataType":"1"}}, "msg_id":{}}}"#,
        pair,
        interval_str,
        SystemTime::now()
            .duration_since(UNIX_EPOCH)
            .unwrap()
            .as_millis(),
    )
}

impl_candlestick!(BitzSpotWSClient);

define_client!(
    BitzSpotWSClient,
    EXCHANGE_NAME,
    WEBSOCKET_URL,
    channels_to_commands,
    on_misc_msg,
    Some(CLIENT_PING_INTERVAL_AND_MSG),
    None
);