FIX: [bitget] use new size instead of size

[bailantaotao]

Bitget API changelog

https://www.bitget.com/api-doc/common/changelog
The spot order channel push now includes a new parameter newSize, which will gradually replace the existing parameter size in subsequent updates.

newSize represents the order quantity, following the specified rules:

when orderType=limit, newSize represents the quantity of base coin,
when orderType=market and side=buy, newSize represents the quantity of quote coin,
when orderType=market and side=sell, newSize represents the quantity of base coin

Unexpected Size field

The size filed is unexpected on limit buy order. it represents the size * volume. This is different from what was previously tested.

The order placed a limit buy at price 1.6 and size 5.6756, but the websocket returned size 9.0809.

[{"instId":"APEUSDT","orderId":"1144801703390253056","clientOid":"8d9160a6-69a6-46e6-b6bf-41f77a869c7e","price":"1.6000","size":"9.0809","newSize":"5.6756","notional":"9.080960","orderType":"limit","force":"gtc","side":"buy","accBaseVolume":"0.0000","priceAvg":"0.0000","status":"live","cTime":"1708667916152","uTime":"1708667916152","feeDetail":[],"enterPointSource":"WEB"}]

The raw data above is displayed in the web console.

Other data filed in size and newSize is expected.

when orderType=limit, and side = sell, newSize and size represents the quantity of base coin,

[{"instId":"APEUSDT","orderId":"1144800668517044224","clientOid":"b540604a-21a3-40d6-9655-ee42e2db41f7","price":"1.6800","size":"3.3000","newSize":"3.3000","orderType":"limit","force":"gtc","side":"sell","accBaseVolume":"0.0000","priceAvg":"0.0000","status":"cancelled","cTime":"1708667669419","uTime":"1708667676652","feeDetail":[],"enterPointSource":"WEB"}]

when orderType=market and side=buy, newSize and size represents the quantity of quote coin,

[{"instId":"APEUSDT","orderId":"1144800468134170630","clientOid":"d0f595a1-482f-46f6-8bac-02b88052b5f1","size":"5.5000","newSize":"5.5000","notional":"5.500000","orderType":"market","force":"gtc","side":"buy","accBaseVolume":"0.0000","priceAvg":"0.0000","status":"live","cTime":"1708667621644","uTime":"1708667621644","feeDetail":[],"enterPointSource":"WEB"}]

when orderType=market and side=sell, newSize and size represents the quantity of base coin

[{"instId":"APEUSDT","orderId":"1144800723705696258","clientOid":"5bbf35af-c8e6-491b-ac38-55f2ee9e1e70","size":"3.3114","newSize":"3.3114","orderType":"market","force":"gtc","side":"sell","accBaseVolume":"0.0000","priceAvg":"0.0000","status":"live","cTime":"1708667682577","uTime":"1708667682577","feeDetail":[],"enterPointSource":"WEB"}]

[bbgokarma-bot]

Welcome back! @bailantaotao, This pull request may get 218 BBG.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 21.77%. Comparing base (06c533f) to head (5c75095).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1542   +/-   ##
=======================================
  Coverage   21.77%   21.77%           
=======================================
  Files         606      606           
  Lines       43940    43940           
=======================================
  Hits         9566     9566           
  Misses      33692    33692           
  Partials      682      682           

Files	Coverage Δ
pkg/exchange/bitget/convert.go	91.73% <100.00%> (ø)
pkg/exchange/bitget/types.go	51.64% <ø> (ø)

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[bbgokarma-bot]

Hi @bailantaotao,

Well done! 228 BBG has been sent to your polygon wallet. Please check the following tx:

https://polygonscan.com/tx/0xb79f4da8870061f88a77a73155460369d21b8c944880918fbe992ccf48391581

Thank you for your contribution!