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// ...parser...
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}
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</code></pre>
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<p>deferred函数帮助Parse从panic中恢复。在deferred函数内部，panic value被附加到错误信息中；并用err变量接收错误信息，返回给调用者。我们也可以通过调用runtime.Stack往错误信息中添加完整的堆栈调用信息。</p>
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<p>recover函数帮助Parse从panic中恢复。在deferred函数内部，panic value被附加到错误信息中；并用err变量接收错误信息，返回给调用者。我们也可以通过调用runtime.Stack往错误信息中添加完整的堆栈调用信息。</p>
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<p>不加区分的恢复所有的panic异常，不是可取的做法；因为在panic之后，无法保证包级变量的状态仍然和我们预期一致。比如，对数据结构的一次重要更新没有被完整完成、文件或者网络连接没有被关闭、获得的锁没有被释放。此外，如果写日志时产生的panic被不加区分的恢复，可能会导致漏洞被忽略。</p>
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<p>虽然把对panic的处理都集中在一个包下，有助于简化对复杂和不可以预料问题的处理，但作为被广泛遵守的规范，你不应该试图去恢复其他包引起的panic。公有的API应该将函数的运行失败作为error返回，而不是panic。同样的，你也不应该恢复一个由他人开发的函数引起的panic，比如说调用者传入的回调函数，因为你无法确保这样做是安全的。</p>
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<p>有时我们很难完全遵循规范，举个例子，net/http包中提供了一个web服务器，将收到的请求分发给用户提供的处理函数。很显然，我们不能因为某个处理函数引发的panic异常，杀掉整个进程；web服务器遇到处理函数导致的panic时会调用recover，输出堆栈信息，继续运行。这样的做法在实践中很便捷，但也会引起资源泄漏，或是因为recover操作，导致其他问题。</p>
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// ...parser...
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}
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</code></pre>
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<p>deferred函数帮助Parse从panic中恢复。在deferred函数内部，panic value被附加到错误信息中；并用err变量接收错误信息，返回给调用者。我们也可以通过调用runtime.Stack往错误信息中添加完整的堆栈调用信息。</p>
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<p>recover函数帮助Parse从panic中恢复。在deferred函数内部，panic value被附加到错误信息中；并用err变量接收错误信息，返回给调用者。我们也可以通过调用runtime.Stack往错误信息中添加完整的堆栈调用信息。</p>
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<p>不加区分的恢复所有的panic异常，不是可取的做法；因为在panic之后，无法保证包级变量的状态仍然和我们预期一致。比如，对数据结构的一次重要更新没有被完整完成、文件或者网络连接没有被关闭、获得的锁没有被释放。此外，如果写日志时产生的panic被不加区分的恢复，可能会导致漏洞被忽略。</p>
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<p>虽然把对panic的处理都集中在一个包下，有助于简化对复杂和不可以预料问题的处理，但作为被广泛遵守的规范，你不应该试图去恢复其他包引起的panic。公有的API应该将函数的运行失败作为error返回，而不是panic。同样的，你也不应该恢复一个由他人开发的函数引起的panic，比如说调用者传入的回调函数，因为你无法确保这样做是安全的。</p>
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<p>有时我们很难完全遵循规范，举个例子，net/http包中提供了一个web服务器，将收到的请求分发给用户提供的处理函数。很显然，我们不能因为某个处理函数引发的panic异常，杀掉整个进程；web服务器遇到处理函数导致的panic时会调用recover，输出堆栈信息，继续运行。这样的做法在实践中很便捷，但也会引起资源泄漏，或是因为recover操作，导致其他问题。</p>
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