python-bitshares指定node节点的坑

<p dir="auto"><br /><span>最近学习了<a href="/@oflyhigh">@oflyhigh写的python-bitshares系列相关文章，试着自己写了些代码，发现学习过程中有些问题，记录下来。<span> python-bitshares是<a href="/@xeroc">@xeroc大神维护的库 ,uptick就是用的这个库。 <blockquote> <p dir="auto"><br /> 或<br /><span><a href="https://github.com/bitshares/python-bitshares" target="_blank" rel="nofollow noreferrer noopener" title="This link will take you away from hive.blog" class="external_link">https://github.com/bitshares/python-bitshares<span> <a href="https://github.com/xeroc/python-bitshares" target="_blank" rel="nofollow noreferrer noopener" title="This link will take you away from hive.blog" class="external_link">https://github.com/xeroc/python-bitshares <h4>安装： <pre><code>pip install bitshares <h4>升级： <pre><code>pip install --user --upgrade <p dir="auto">然后我们就可以开发自己的bitshares应用程序了。 <pre><code>from bitshares import BitShares from pprint import pprint node = "wss://ws.gdex.top" bts = BitShares(node) pprint(bts.info()) <p dir="auto">ok，看起来貌似一切正常，但是，当我们newWallet，addPrivateKey，并且set_default_account(account)操作时，诡异的事情发生了：<br /> <img src="https://images.hive.blog/768x0/https://steemitimages.com/DQmY8is5pTiZQ5PXDpu5Rg2g5fb223JS9RWmnDc8pZorqWa/%E5%9B%BE%E7%89%87.png" srcset="https://images.hive.blog/768x0/https://steemitimages.com/DQmY8is5pTiZQ5PXDpu5Rg2g5fb223JS9RWmnDc8pZorqWa/%E5%9B%BE%E7%89%87.png 1x, https://images.hive.blog/1536x0/https://steemitimages.com/DQmY8is5pTiZQ5PXDpu5Rg2g5fb223JS9RWmnDc8pZorqWa/%E5%9B%BE%E7%89%87.png 2x" /><br /> 发现我们设置的node没起作用，竟然连接到 <blockquote> <p dir="auto">wss://node.bitshares.eu <p dir="auto">经过代码跟踪，发现这是storage.py这个单元中的class Configuration(DataDir)这个类中设定的默认认值：<br /> <img src="https://images.hive.blog/768x0/https://steemitimages.com/DQmeQaPAW3bmb4eBn2n299hruue15sgZ4e8Z9vs8mtBRfMk/%E5%9B%BE%E7%89%87.png" srcset="https://images.hive.blog/768x0/https://steemitimages.com/DQmeQaPAW3bmb4eBn2n299hruue15sgZ4e8Z9vs8mtBRfMk/%E5%9B%BE%E7%89%87.png 1x, https://images.hive.blog/1536x0/https://steemitimages.com/DQmeQaPAW3bmb4eBn2n299hruue15sgZ4e8Z9vs8mtBRfMk/%E5%9B%BE%E7%89%87.png 2x" /><br /> 找到问题就容易解决了，添加如下代码，搞定： <pre><code>Configuration.config_defaults["node"] = node <p dir="auto">那么bug成因是什么呢？看代码：<br /> <img src="https://images.hive.blog/768x0/https://steemitimages.com/DQmcyQv5Jy2ZUx1BY9Sq7g4MFLtNiippfiBmcTJEEKF58Px/%E5%9B%BE%E7%89%87.png" srcset="https://images.hive.blog/768x0/https://steemitimages.com/DQmcyQv5Jy2ZUx1BY9Sq7g4MFLtNiippfiBmcTJEEKF58Px/%E5%9B%BE%E7%89%87.png 1x, https://images.hive.blog/1536x0/https://steemitimages.com/DQmcyQv5Jy2ZUx1BY9Sq7g4MFLtNiippfiBmcTJEEKF58Px/%E5%9B%BE%E7%89%87.png 2x" /><br /> 因为set_default_account函数创建了一个Account实例，但是没有传bitshares_instance参数，而Account类的父类BlockchainObject在bitshares_instance=None时又调用了instance.py单元的shared_bitshares_instance函数：<br /> <img src="https://images.hive.blog/768x0/https://steemitimages.com/DQmPDDDnF1AuLkgVJ6Y521EjKanATwPTV2GnzcStU34P5cj/%E5%9B%BE%E7%89%87.png" srcset="https://images.hive.blog/768x0/https://steemitimages.com/DQmPDDDnF1AuLkgVJ6Y521EjKanATwPTV2GnzcStU34P5cj/%E5%9B%BE%E7%89%87.png 1x, https://images.hive.blog/1536x0/https://steemitimages.com/DQmPDDDnF1AuLkgVJ6Y521EjKanATwPTV2GnzcStU34P5cj/%E5%9B%BE%E7%89%87.png 2x" /><br /> 再看shared_bitshares_instance函数干了什么：<br /> <img src="https://images.hive.blog/768x0/https://steemitimages.com/DQmed5VLmdW5b3ytvSyzBz9gw3r46hf29zoCC713Ne4oEYu/%E5%9B%BE%E7%89%87.png" srcset="https://images.hive.blog/768x0/https://steemitimages.com/DQmed5VLmdW5b3ytvSyzBz9gw3r46hf29zoCC713Ne4oEYu/%E5%9B%BE%E7%89%87.png 1x, https://images.hive.blog/1536x0/https://steemitimages.com/DQmed5VLmdW5b3ytvSyzBz9gw3r46hf29zoCC713Ne4oEYu/%E5%9B%BE%E7%89%87.png 2x" /><br /> 创建了一个新的BitShares实例，并传入了空的配置，然后再回到bitshares.py单元：<br /> <img src="https://images.hive.blog/768x0/https://steemitimages.com/DQma8GAS2FaVc73BSturkLGnHcPVeAxua7DpU6AZcZ2hEDv/%E5%9B%BE%E7%89%87.png" srcset="https://images.hive.blog/768x0/https://steemitimages.com/DQma8GAS2FaVc73BSturkLGnHcPVeAxua7DpU6AZcZ2hEDv/%E5%9B%BE%E7%89%87.png 1x, https://images.hive.blog/1536x0/https://steemitimages.com/DQma8GAS2FaVc73BSturkLGnHcPVeAxua7DpU6AZcZ2hEDv/%E5%9B%BE%E7%89%87.png 2x" /><br /> 一切都已明了，在BitShares对象创建时，如果node传空参，就去storage.py中读取默认值config_defaults["node"]。<br /> 搞完，收工。