March 2022
Intermediate to advanced
293 pages
5h 31m
Chinese
Content preview from 精通区块链
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市场基础设施 ｜ 171
6.7.3 REST
与
WebSocket
速度是构建高质量交易机器人的重要因素，这样机器人才能在别人之前读懂
市场并执行交易。在使用
REST API
时，交易机器人必须不断地轮询
API
以
查看市场的最新状态，这往往会导致市场发生变化和交易机器人看到该变化
之间的时间间隔。当交易机器人受到速率限制而必须等待一瞬间才能发出有
效的请求时，这些间隔会大大增加。
交易机器人查看当前市场状态的更快方法是订阅
WebSocket
。通过这种设置，
一旦市场发生变化，交易所的服务器就会向
WebSocket
的所有订阅者推送通
知。然后，所有订阅
WebSocket
的交易机器人将在同一时间收到相同的信息，
不需要发送额外
API
请求。
对交易者来说，找出交易所托管其
API
服务器的确切位置，并将他们的交易
机器人托管在同一地点，可能会有帮助。例如，如果交易所的
API
服务器托
管在北弗吉尼亚地区的
AWS
上，交易者可以在同一地区的
AWS
上托管他
们的机器人，以确保更快的通信。
6.7.4
在沙盒中进行测试
当开发者在测试交易机器人的各种功能时，理想情况下应该使用假钱在沙盒
（
sandbox
）环境中进行测试。如果交易所的
API
没有沙盒环境，开发者就不
得不使用真钱来测试出功能，这往往限制了交易机器人的测试能力。使用真
钱测试新功能通常风险太大，很容易因为
bug
而损失。
6.7.5
市场汇总器
有一些服务（如
CoinMarketCap
和
CoinGecko
）从数百家交易所汇总市场价格，
并将这些数据打包到
API
中。这种
API
的优点是可以让交易机器人很容易地 ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.