huobipro fetchOpenOrders: consider using different endpoints depends on whether symbol param is present

• OS: MacOS 10.14.5
• Programming Language version: Nodejs 10.15.3
• CCXT version: 1.18.829
• Exchange: huobipro
• Method: fetchOpenOrders

Suggestion:

• Use v1/order/openOrders if symbol parameter is present.
• If not, there’s a way to get open orders of all symbols using v1/order/orders?states=submitted,partial-filled,created. The documentation says the endpoint will be deprecated, but their website is currently using it anyway

This is the request URL comes from their website querying for open orders https://www.hbg.com/-/x/pro/v1/order/orders?states=submitted,partial-filled,created&size=11 (I guess the APIs they’re using are the same except the https://www.hbg.com/-/x/pro/v1/ part)

[lostless13]

The “fetchOpenOrdersV1” method in the huobipro class that calls is the “order/orders” api endpoint is returning the following error from huobi for me when no symbol is provided:

ExchangeError: huobipro {"status":"error","err-code":"require-symbol","err-msg":"Parameter `symbol` is required.","data":null}

Looking through the docs they too seem to reflect requiring the symbol field on the order/orders endpoint now.

Unless I’m missing something in the docs, there is not a method that returns all open orders as far as I can tell.

[kroitor]

We have reverted the defaults and the called endpoints to how they were before adding this change and we have added two options:

exchange = ccxt.huobipro ({
    
    # this option is for open orders only
    'fetchOpenOrdersMethod': 'fetch_open_orders_v1',  # or 'fetch_open_orders_v2'
    
    # this option is for all v1 orders
    'fetchOrdersByStatedMethod': 'private_get_order_orders',  # or 'private_get_order_history'
})

The fetchOpenOrdersV1 method is the default and it will use the privateGetOrderOrders endpoint by default.

Related: #5376.