{"id":926920,"date":"2024-12-26T15:58:46","date_gmt":"2024-12-26T07:58:46","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/926920.html"},"modified":"2024-12-26T15:58:48","modified_gmt":"2024-12-26T07:58:48","slug":"python%e5%a6%82%e4%bd%95%e7%86%94%e6%96%ad","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/926920.html","title":{"rendered":"python\u5982\u4f55\u7194\u65ad"},"content":{"rendered":"<p style=\"text-align:center;\" ><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/25063313\/be5f69a8-6e12-4d83-9ace-0f441cd55d30.webp\" alt=\"python\u5982\u4f55\u7194\u65ad\" \/><\/p>\n<p><p> <strong>\u5728Python\u4e2d\u5b9e\u73b0\u7194\u65ad\u673a\u5236\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u5e93\u5982<code>pybreaker<\/code>\u6216\u81ea\u5df1\u5b9e\u73b0\u4e00\u4e2a\u7b80\u5355\u7684\u7194\u65ad\u5668\u3002\u7194\u65ad\u673a\u5236\u7684\u6838\u5fc3\u662f\uff1a\u76d1\u63a7\u670d\u52a1\u8c03\u7528\u7684\u5931\u8d25\u7387\u3001\u6839\u636e\u8bbe\u5b9a\u7684\u9608\u503c\u81ea\u52a8\u6682\u505c\u8c03\u7528\u3001\u5728\u77ed\u65f6\u95f4\u5185\u91cd\u8bd5\u5e76\u68c0\u6d4b\u670d\u52a1\u6062\u590d\u60c5\u51b5\u3002<\/strong>\u5176\u4e2d\uff0c\u4f7f\u7528<code>pybreaker<\/code>\u5e93\u662f\u4e00\u4e2a\u5e38\u89c1\u7684\u65b9\u6cd5\uff0c\u56e0\u4e3a\u5b83\u63d0\u4f9b\u4e86\u4e00\u4e2a\u7b80\u5355\u6613\u7528\u7684\u7194\u65ad\u5668\u5b9e\u73b0\u3002\u901a\u8fc7\u8bbe\u5b9a\u5931\u8d25\u9608\u503c\u3001\u7194\u65ad\u65f6\u95f4\u4ee5\u53ca\u76d1\u63a7\u670d\u52a1\u6062\u590d\u60c5\u51b5\uff0c\u6211\u4eec\u53ef\u4ee5\u6709\u6548\u5730\u4fdd\u62a4\u7cfb\u7edf\u514d\u53d7\u8fc7\u8f7d\u6216\u6545\u969c\u670d\u52a1\u7684\u5f71\u54cd\u3002\u4e0b\u9762\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u5982\u4f55\u5728Python\u4e2d\u5b9e\u73b0\u7194\u65ad\u673a\u5236\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u7194\u65ad\u673a\u5236\u7684\u57fa\u672c\u6982\u5ff5<\/h3>\n<\/p>\n<p><p>\u7194\u65ad\u673a\u5236\u662f\u4e00\u79cd\u4fdd\u62a4\u7cfb\u7edf\u514d\u53d7\u8fc7\u8f7d\u7684\u8bbe\u8ba1\u6a21\u5f0f\u3002\u5b83\u7684\u7075\u611f\u6765\u6e90\u4e8e\u7535\u8def\u4e2d\u7684\u7194\u65ad\u5668\uff0c\u5f53\u7535\u8def\u8d1f\u8f7d\u8fc7\u9ad8\u65f6\uff0c\u7194\u65ad\u5668\u4f1a\u81ea\u52a8\u65ad\u5f00\uff0c\u9632\u6b62\u7535\u8def\u635f\u574f\u3002\u5728\u8f6f\u4ef6\u7cfb\u7edf\u4e2d\uff0c\u7194\u65ad\u673a\u5236\u53ef\u4ee5\u9632\u6b62\u56e0\u67d0\u4e2a\u670d\u52a1\u7684\u6545\u969c\u6216\u54cd\u5e94\u7f13\u6162\u800c\u5bfc\u81f4\u6574\u4e2a\u7cfb\u7edf\u7684\u6027\u80fd\u4e0b\u964d\u3002<\/p>\n<\/p>\n<p><h4>1.1 \u7194\u65ad\u5668\u7684\u72b6\u6001<\/h4>\n<\/p>\n<p><p>\u7194\u65ad\u5668\u901a\u5e38\u6709\u4e09\u79cd\u72b6\u6001\uff1a<\/p>\n<\/p>\n<ul>\n<li><strong>\u95ed\u5408\u72b6\u6001\uff08Closed\uff09<\/strong>\uff1a\u7cfb\u7edf\u6b63\u5e38\u5de5\u4f5c\uff0c\u5141\u8bb8\u8bf7\u6c42\u901a\u8fc7\u3002<\/li>\n<li><strong>\u6253\u5f00\u72b6\u6001\uff08Open\uff09<\/strong>\uff1a\u5f53\u5931\u8d25\u7387\u8d85\u8fc7\u8bbe\u5b9a\u7684\u9608\u503c\u65f6\uff0c\u7194\u65ad\u5668\u6253\u5f00\uff0c\u963b\u6b62\u8bf7\u6c42\u901a\u8fc7\u3002<\/li>\n<li><strong>\u534a\u5f00\u72b6\u6001\uff08Half-Open\uff09<\/strong>\uff1a\u5728\u6253\u5f00\u72b6\u6001\u7ecf\u8fc7\u4e00\u6bb5\u65f6\u95f4\u540e\uff0c\u7194\u65ad\u5668\u4f1a\u8fdb\u5165\u534a\u5f00\u72b6\u6001\uff0c\u5141\u8bb8\u90e8\u5206\u8bf7\u6c42\u901a\u8fc7\u4ee5\u68c0\u6d4b\u670d\u52a1\u662f\u5426\u6062\u590d\u3002<\/li>\n<\/ul>\n<p><h4>1.2 \u7194\u65ad\u5668\u7684\u89e6\u53d1\u6761\u4ef6<\/h4>\n<\/p>\n<p><p>\u7194\u65ad\u5668\u7684\u89e6\u53d1\u901a\u5e38\u57fa\u4e8e\u4ee5\u4e0b\u6761\u4ef6\uff1a<\/p>\n<\/p>\n<ul>\n<li><strong>\u5931\u8d25\u7387<\/strong>\uff1a\u5728\u4e00\u5b9a\u65f6\u95f4\u7a97\u53e3\u5185\uff0c\u5931\u8d25\u8bf7\u6c42\u7684\u6bd4\u4f8b\u8d85\u8fc7\u8bbe\u5b9a\u7684\u9608\u503c\u3002<\/li>\n<li><strong>\u8fde\u7eed\u5931\u8d25\u6b21\u6570<\/strong>\uff1a\u8fde\u7eed\u5931\u8d25\u7684\u8bf7\u6c42\u6570\u91cf\u8d85\u8fc7\u8bbe\u5b9a\u503c\u3002<\/li>\n<\/ul>\n<p><h3>\u4e8c\u3001\u4f7f\u7528<code>pybreaker<\/code>\u5e93\u5b9e\u73b0\u7194\u65ad<\/h3>\n<\/p>\n<p><p><code>pybreaker<\/code>\u662f\u4e00\u4e2aPython\u5e93\uff0c\u63d0\u4f9b\u4e86\u4e00\u4e2a\u7b80\u5355\u6613\u7528\u7684\u7194\u65ad\u5668\u5b9e\u73b0\u3002\u901a\u8fc7\u8fd9\u4e2a\u5e93\uff0c\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u5730\u5728Python\u5e94\u7528\u4e2d\u96c6\u6210\u7194\u65ad\u673a\u5236\u3002<\/p>\n<\/p>\n<p><h4>2.1 \u5b89\u88c5<code>pybreaker<\/code><\/h4>\n<\/p>\n<p><p>\u8981\u4f7f\u7528<code>pybreaker<\/code>\uff0c\u9996\u5148\u9700\u8981\u5b89\u88c5\u5b83\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u547d\u4ee4\u5b89\u88c5\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-bash\">pip install pybreaker<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2.2 \u57fa\u672c\u4f7f\u7528\u793a\u4f8b<\/h4>\n<\/p>\n<p><p>\u4e0b\u9762\u662f\u4e00\u4e2a\u4f7f\u7528<code>pybreaker<\/code>\u5b9e\u73b0\u7194\u65ad\u673a\u5236\u7684\u57fa\u672c\u793a\u4f8b\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">import pybreaker<\/p>\n<p>import requests<\/p>\n<h2><strong>\u521b\u5efa\u7194\u65ad\u5668\u5b9e\u4f8b<\/strong><\/h2>\n<p>breaker = pybreaker.CircuitBreaker(f<a href=\"https:\/\/docs.pingcode.com\/blog\/59162.html\" target=\"_blank\">AI<\/a>l_max=5, reset_timeout=60)<\/p>\n<p>def fetch_data(url):<\/p>\n<p>    try:<\/p>\n<p>        # \u4f7f\u7528\u7194\u65ad\u5668\u88c5\u9970\u8bf7\u6c42\u51fd\u6570<\/p>\n<p>        with breaker:<\/p>\n<p>            response = requests.get(url)<\/p>\n<p>            response.raise_for_status()<\/p>\n<p>            return response.json()<\/p>\n<p>    except pybreaker.CircuitBreakerError:<\/p>\n<p>        print(&quot;Circuit is open. Request blocked!&quot;)<\/p>\n<p>    except requests.RequestException as e:<\/p>\n<p>        print(f&quot;Request failed: {e}&quot;)<\/p>\n<h2><strong>\u793a\u4f8b\u8c03\u7528<\/strong><\/h2>\n<p>data = fetch_data(&quot;https:\/\/api.example.com\/data&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2.3 <code>pybreaker<\/code>\u7684\u914d\u7f6e\u9009\u9879<\/h4>\n<\/p>\n<ul>\n<li><strong><code>fail_max<\/code><\/strong>\uff1a\u5728\u6307\u5b9a\u65f6\u95f4\u7a97\u53e3\u5185\u5141\u8bb8\u7684\u6700\u5927\u5931\u8d25\u6b21\u6570\u3002<\/li>\n<li><strong><code>reset_timeout<\/code><\/strong>\uff1a\u7194\u65ad\u5668\u4ece\u6253\u5f00\u72b6\u6001\u5230\u534a\u5f00\u72b6\u6001\u7684\u7b49\u5f85\u65f6\u95f4\u3002<\/li>\n<\/ul>\n<p><h3>\u4e09\u3001\u81ea\u5b9a\u4e49\u7194\u65ad\u5668\u5b9e\u73b0<\/h3>\n<\/p>\n<p><p>\u9664\u4e86\u4f7f\u7528\u73b0\u6210\u7684\u5e93\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u6839\u636e\u9700\u6c42\u81ea\u884c\u5b9e\u73b0\u4e00\u4e2a\u7b80\u5355\u7684\u7194\u65ad\u5668\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u81ea\u5b9a\u4e49\u7194\u65ad\u5668\u7684\u57fa\u672c\u5b9e\u73b0\u793a\u4f8b\uff1a<\/p>\n<\/p>\n<p><h4>3.1 \u81ea\u5b9a\u4e49\u7194\u65ad\u5668\u7c7b<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">import time<\/p>\n<p>class SimpleCircuitBreaker:<\/p>\n<p>    def __init__(self, fail_threshold, recovery_time):<\/p>\n<p>        self.fail_threshold = fail_threshold<\/p>\n<p>        self.recovery_time = recovery_time<\/p>\n<p>        self.failure_count = 0<\/p>\n<p>        self.last_failure_time = None<\/p>\n<p>        self.state = &quot;CLOSED&quot;<\/p>\n<p>    def call(self, func, *args, kwargs):<\/p>\n<p>        if self.state == &quot;OPEN&quot; and time.time() - self.last_failure_time &lt; self.recovery_time:<\/p>\n<p>            raise Exception(&quot;Circuit is open!&quot;)<\/p>\n<p>        try:<\/p>\n<p>            result = func(*args, kwargs)<\/p>\n<p>            self.reset()<\/p>\n<p>            return result<\/p>\n<p>        except Exception as e:<\/p>\n<p>            self.record_failure()<\/p>\n<p>            raise e<\/p>\n<p>    def record_failure(self):<\/p>\n<p>        self.failure_count += 1<\/p>\n<p>        self.last_failure_time = time.time()<\/p>\n<p>        if self.failure_count &gt;= self.fail_threshold:<\/p>\n<p>            self.state = &quot;OPEN&quot;<\/p>\n<p>    def reset(self):<\/p>\n<p>        self.failure_count = 0<\/p>\n<p>        self.state = &quot;CLOSED&quot;<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>3.2 \u4f7f\u7528\u81ea\u5b9a\u4e49\u7194\u65ad\u5668<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">def unstable_service():<\/p>\n<p>    # \u6a21\u62df\u4e00\u4e2a\u53ef\u80fd\u5931\u8d25\u7684\u670d\u52a1<\/p>\n<p>    raise Exception(&quot;Service failed!&quot;)<\/p>\n<p>breaker = SimpleCircuitBreaker(fail_threshold=3, recovery_time=30)<\/p>\n<p>try:<\/p>\n<p>    breaker.call(unstable_service)<\/p>\n<p>except Exception as e:<\/p>\n<p>    print(e)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u56db\u3001\u7194\u65ad\u673a\u5236\u7684\u5e94\u7528\u573a\u666f<\/h3>\n<\/p>\n<p><p>\u7194\u65ad\u673a\u5236\u5e7f\u6cdb\u5e94\u7528\u4e8e\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\uff0c\u5c24\u5176\u662f\u5728\u4ee5\u4e0b\u573a\u666f\u4e2d\uff1a<\/p>\n<\/p>\n<p><h4>4.1 \u5fae\u670d\u52a1\u67b6\u6784<\/h4>\n<\/p>\n<p><p>\u5728\u5fae\u670d\u52a1\u67b6\u6784\u4e2d\uff0c\u5404\u4e2a\u670d\u52a1\u4e4b\u95f4\u901a\u8fc7\u7f51\u7edc\u8fdb\u884c\u901a\u4fe1\uff0c\u7f51\u7edc\u7684\u4e0d\u7a33\u5b9a\u6027\u53ef\u80fd\u5bfc\u81f4\u67d0\u4e9b\u670d\u52a1\u7684\u54cd\u5e94\u53d8\u6162\u751a\u81f3\u4e0d\u53ef\u7528\u3002\u7194\u65ad\u673a\u5236\u53ef\u4ee5\u5e2e\u52a9\u8bc6\u522b\u8fd9\u4e9b\u95ee\u9898\u5e76\u6682\u65f6\u505c\u6b62\u8bf7\u6c42\uff0c\u907f\u514d\u5f71\u54cd\u5230\u5176\u4ed6\u670d\u52a1\u3002<\/p>\n<\/p>\n<p><h4>4.2 \u5916\u90e8API\u8c03\u7528<\/h4>\n<\/p>\n<p><p>\u5bf9\u4e8e\u4f7f\u7528\u7b2c\u4e09\u65b9API\u7684\u5e94\u7528\uff0cAPI\u53ef\u80fd\u56e0\u4e3a\u5404\u79cd\u539f\u56e0\u53d8\u5f97\u4e0d\u53ef\u7528\u3002\u901a\u8fc7\u7194\u65ad\u673a\u5236\uff0c\u53ef\u4ee5\u5728API\u4e0d\u53ef\u7528\u65f6\u81ea\u52a8\u505c\u6b62\u8bf7\u6c42\uff0c\u5e76\u5728API\u6062\u590d\u540e\u91cd\u65b0\u5c1d\u8bd5\u3002<\/p>\n<\/p>\n<p><h4>4.3 \u6570\u636e\u5e93\u8fde\u63a5<\/h4>\n<\/p>\n<p><p>\u5f53\u6570\u636e\u5e93\u51fa\u73b0\u6545\u969c\u6216\u8fde\u63a5\u6570\u8fc7\u591a\u65f6\uff0c\u7194\u65ad\u673a\u5236\u53ef\u4ee5\u6682\u65f6\u963b\u6b62\u65b0\u7684\u8fde\u63a5\u8bf7\u6c42\uff0c\u4fdd\u62a4\u6570\u636e\u5e93\u4e0d\u88ab\u8fc7\u8f7d\u3002<\/p>\n<\/p>\n<p><h3>\u4e94\u3001\u7194\u65ad\u673a\u5236\u7684\u6700\u4f73\u5b9e\u8df5<\/h3>\n<\/p>\n<p><p>\u4e3a\u4e86\u6709\u6548\u5730\u5b9e\u65bd\u7194\u65ad\u673a\u5236\uff0c\u9700\u8981\u9075\u5faa\u4e00\u4e9b\u6700\u4f73\u5b9e\u8df5\uff1a<\/p>\n<\/p>\n<p><h4>5.1 \u5408\u7406\u8bbe\u7f6e\u9608\u503c<\/h4>\n<\/p>\n<p><p>\u6839\u636e\u4e1a\u52a1\u9700\u6c42\u548c\u7cfb\u7edf\u6027\u80fd\u8bbe\u5b9a\u5408\u7406\u7684\u5931\u8d25\u9608\u503c\u548c\u6062\u590d\u65f6\u95f4\uff0c\u907f\u514d\u8fc7\u4e8e\u9891\u7e41\u5730\u89e6\u53d1\u7194\u65ad\u3002<\/p>\n<\/p>\n<p><h4>5.2 \u76d1\u63a7\u548c\u65e5\u5fd7<\/h4>\n<\/p>\n<p><p>\u4f7f\u7528\u76d1\u63a7\u548c\u65e5\u5fd7\u7cfb\u7edf\u8bb0\u5f55\u7194\u65ad\u5668\u7684\u72b6\u6001\u53d8\u5316\u548c\u6545\u969c\u4fe1\u606f\uff0c\u4ee5\u4fbf\u53ca\u65f6\u53d1\u73b0\u548c\u89e3\u51b3\u95ee\u9898\u3002<\/p>\n<\/p>\n<p><h4>5.3 \u4e0e\u91cd\u8bd5\u673a\u5236\u7ed3\u5408<\/h4>\n<\/p>\n<p><p>\u7ed3\u5408\u91cd\u8bd5\u673a\u5236\uff0c\u5728\u7194\u65ad\u5668\u534a\u5f00\u72b6\u6001\u4e0b\u8fdb\u884c\u6709\u9650\u7684\u91cd\u8bd5\uff0c\u4ee5\u68c0\u6d4b\u670d\u52a1\u6062\u590d\u60c5\u51b5\u3002<\/p>\n<\/p>\n<p><h4>5.4 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