{"id":42386,"date":"2025-06-08T15:27:25","date_gmt":"2025-06-08T07:27:25","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/42386.html"},"modified":"2025-06-08T15:27:25","modified_gmt":"2025-06-08T07:27:25","slug":"golang%ef%bd%9cetcd%e6%9c%8d%e5%8a%a1%e6%b3%a8%e5%86%8c%e4%b8%8e%e5%8f%91%e7%8e%b0-%e7%ad%96%e7%95%a5%e6%a8%a1%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/42386.html","title":{"rendered":"Golang\uff5cetcd\u670d\u52a1\u6ce8\u518c\u4e0e\u53d1\u73b0 &amp; \u7b56\u7565\u6a21\u5f0f"},"content":{"rendered":"<ul>\n<li>etcd \u662f\u4e00\u4e2a\u5f00\u6e90\u7684 \u5206\u5e03\u5f0f\u952e\u503c\u5b58\u50a8\u7cfb\u7edf&#xff08;Key-Value Store&#xff09;&#xff0c;\u4e3b\u8981\u7528\u4e8e\u914d\u7f6e\u5171\u4eab\u548c\u670d\u52a1\u53d1\u73b0\u3002<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250608072722-68453b5a5dde3.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250608072722-68453b5ac388a.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250608072723-68453b5b3fcfc.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<ul>\n<li>ETCD\u662f\u4e00\u4e2a\u952e\u503c&#xff08;KV&#xff09;\u6570\u636e\u5e93&#xff0c;\u7c7b\u4f3c\u4e8eRedis&#xff0c;\u652f\u6301\u5206\u5e03\u5f0f\u96c6\u7fa4\u3002<\/li>\n<li>ETCD\u4e5f\u53ef\u4ee5\u770b\u4f5c\u662f\u4e00\u4e2a\u5206\u5e03\u5f0f\u6587\u4ef6\u7cfb\u7edf&#xff0c;\u7c7b\u4f3c\u4e8eZooKeeper&#xff0c;\u53ef\u4ee5\u5bf9\u6587\u4ef6\u548c\u76ee\u5f55\u8fdb\u884c\u76d1\u542c\u3002<\/li>\n<li>\u5728\u670d\u52a1\u6ce8\u518c\u573a\u666f\u4e0b&#xff0c;ETCD\u4e2d\u7684key\u662f\u7c7b\u4f3c\u4e8e\u6587\u4ef6\u8def\u5f84\u7684\u5b57\u7b26\u4e32&#xff0c;value\u4e3a\u7a7a\u3002<\/li>\n<li>\u6bcf\u53f0\u670d\u52a1\u5668\u542f\u52a8\u540e&#xff0c;\u4f1a\u4e3b\u52a8\u5c06\u81ea\u5df1\u7684IP\u5730\u5740\u548c\u63d0\u4f9b\u7684\u670d\u52a1\u540d\u79f0\u5199\u5165ETCD\u3002<\/li>\n<li>\u4e3a\u4e86\u9632\u6b62key\u8fc7\u671f&#xff0c;\u670d\u52a1\u5668\u4f1a\u6bcf\u9694\u4e00\u6bb5\u65f6\u95f4&#xff08;\u59829\u79d2&#xff09;\u91cd\u65b0\u5199\u5165\u81ea\u5df1\u7684\u4fe1\u606f\u3002<\/li>\n<li>\u901a\u8fc7\u8bbe\u7f6e\u79df\u671f&#xff08;\u59822\u79d2&#xff09;&#xff0c;ETCD\u53ef\u4ee5\u5728\u670d\u52a1\u5668\u5b95\u673a\u540e\u53ca\u65f6\u6e05\u7406\u8fc7\u671f\u7684key\u3002<\/li>\n<li>\u5ba2\u6237\u7aef\u901a\u8fc7\u67e5\u8be2ETCD\u6765\u83b7\u53d6\u80fd\u591f\u63d0\u4f9b\u670d\u52a1\u7684\u670d\u52a1\u5668IP\u5730\u5740\u3002<\/li>\n<li>\u5ba2\u6237\u7aef\u53ef\u4ee5\u67e5\u8be2\u5177\u6709\u7279\u5b9a\u524d\u7f00\u7684key&#xff0c;\u4ee5\u83b7\u53d6\u6240\u6709\u63d0\u4f9b\u76f8\u540c\u670d\u52a1\u7684\u670d\u52a1\u5668IP\u3002<\/li>\n<li>ETCD\u652f\u6301\u76d1\u542c\u529f\u80fd&#xff0c;\u5ba2\u6237\u7aef\u53ef\u4ee5\u76d1\u542c\u7279\u5b9a\u524d\u7f00\u7684\u53d8\u5316&#xff0c;\u5b9e\u65f6\u83b7\u53d6\u65b0\u7684\u670d\u52a1\u5668\u4fe1\u606f\u3002<\/li>\n<\/ul>\n<p><span class=\"token keyword\">package<\/span> service_hub<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">(<\/span><br \/>\n<span class=\"token string\">&#034;context&#034;<\/span><br \/>\n<span class=\"token string\">&#034;errors&#034;<\/span><br \/>\n<span class=\"token string\">&#034;github.com\/jmh000527\/criker-search\/index_service\/load_balancer&#034;<\/span><br \/>\n<span class=\"token string\">&#034;github.com\/jmh000527\/criker-search\/utils&#034;<\/span><br \/>\n<span class=\"token string\">&#034;go.etcd.io\/etcd\/api\/v3\/v3rpc\/rpctypes&#034;<\/span><br \/>\netcdv3 <span class=\"token string\">&#034;go.etcd.io\/etcd\/client\/v3&#034;<\/span><br \/>\n<span class=\"token string\">&#034;strings&#034;<\/span><br \/>\n<span class=\"token string\">&#034;sync&#034;<\/span><br \/>\n<span class=\"token string\">&#034;time&#034;<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\">\/\/ EtcdServiceHub \u670d\u52a1\u6ce8\u518c\u4e2d\u5fc3&#xff0c;\u4f7f\u7528\u5355\u4f8b\u6a21\u5f0f\u6784\u9020\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8be5\u670d\u52a1\u7528\u4e8e\u4e0eetcd\u8fdb\u884c\u4ea4\u4e92&#xff0c;\u7ba1\u7406\u670d\u52a1\u7684\u6ce8\u518c\u3001\u6ce8\u9500\u4ee5\u53ca\u5fc3\u8df3\u7eed\u7ea6\u7b49\u529f\u80fd\u3002<\/span><br \/>\n<span class=\"token keyword\">type<\/span> EtcdServiceHub <span class=\"token keyword\">struct<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nclient             <span class=\"token operator\">*<\/span>etcdv3<span class=\"token punctuation\">.<\/span>Client             <span class=\"token comment\">\/\/ etcd\u5ba2\u6237\u7aef&#xff0c;\u7528\u4e8e\u4e0eetcd\u8fdb\u884c\u64cd\u4f5c<\/span><br \/>\nheartbeatFrequency <span class=\"token builtin\">int64<\/span>                      <span class=\"token comment\">\/\/ \u670d\u52a1\u7eed\u7ea6\u7684\u5fc3\u8df3\u9891\u7387&#xff0c;\u5355\u4f4d&#xff1a;\u79d2<\/span><br \/>\nwatched            sync<span class=\"token punctuation\">.<\/span>Map                   <span class=\"token comment\">\/\/ \u5b58\u50a8\u5df2\u7ecf\u76d1\u89c6\u7684\u670d\u52a1&#xff0c;\u4ee5\u907f\u514d\u91cd\u590d\u76d1\u89c6<\/span><br \/>\nloadBalancer       load_balancer<span class=\"token punctuation\">.<\/span>LoadBalancer <span class=\"token comment\">\/\/ \u8d1f\u8f7d\u5747\u8861\u7b56\u7565\u7684\u63a5\u53e3&#xff0c;\u652f\u6301\u591a\u79cd\u8d1f\u8f7d\u5747\u8861\u5b9e\u73b0<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">const<\/span> <span class=\"token punctuation\">(<\/span><br \/>\nServiceRootPath <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\/criker-search&#034;<\/span> <span class=\"token comment\">\/\/ etcd key\u7684\u524d\u7f00<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">var<\/span> <span class=\"token punctuation\">(<\/span><br \/>\netcdServiceHub <span class=\"token operator\">*<\/span>EtcdServiceHub <span class=\"token comment\">\/\/ \u8be5\u5168\u5c40\u53d8\u91cf\u5305\u5916\u4e0d\u53ef\u89c1&#xff0c;\u5305\u5916\u60f3\u4f7f\u7528\u65f6\u901a\u8fc7GetServiceHub()\u83b7\u5f97<\/span><br \/>\nhubOnce        sync<span class=\"token punctuation\">.<\/span>Once       <span class=\"token comment\">\/\/ \u5355\u4f8b\u6a21\u5f0f\u9700\u8981\u7528\u5230\u4e00\u4e2aonce<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\">\/\/ GetServiceHub ServiceHub\u7684\u6784\u9020\u51fd\u6570&#xff0c;\u91c7\u7528\u5355\u4f8b\u6a21\u5f0f\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/<\/span><br \/>\n<span class=\"token comment\">\/\/ \u53c2\u6570:<\/span><br \/>\n<span class=\"token comment\">\/\/   &#8211; etcdServers: \u5305\u542betcd\u670d\u52a1\u5668\u5730\u5740\u7684\u5b57\u7b26\u4e32\u5207\u7247\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/   &#8211; heartbeatFrequency: \u5fc3\u8df3\u9891\u7387&#xff0c;\u8868\u793a\u670d\u52a1\u5fc3\u8df3\u7684\u95f4\u9694\u65f6\u95f4&#xff08;\u4ee5\u79d2\u4e3a\u5355\u4f4d&#xff09;\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8fd4\u56de\u503c:<\/span><br \/>\n<span class=\"token comment\">\/\/   &#8211; *EtcdServiceHub: \u8fd4\u56de\u4e00\u4e2a\u521d\u59cb\u5316\u597d\u7684EtcdServiceHub\u5b9e\u4f8b\u3002<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token function\">GetServiceHub<\/span><span class=\"token punctuation\">(<\/span>etcdServers <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token builtin\">string<\/span><span class=\"token punctuation\">,<\/span> heartbeatFrequency <span class=\"token builtin\">int64<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span>EtcdServiceHub <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u68c0\u67e5\u662f\u5426\u5df2\u7ecf\u5b58\u5728etcdServiceHub\u5b9e\u4f8b<\/span><br \/>\n<span class=\"token keyword\">if<\/span> etcdServiceHub <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token boolean\">nil<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u4f7f\u7528sync.Once\u786e\u4fdd\u5355\u4f8b\u6a21\u5f0f&#xff0c;hubOnce.Do\u4e2d\u7684\u4ee3\u7801\u5757\u53ea\u4f1a\u88ab\u6267\u884c\u4e00\u6b21<\/span><br \/>\nhubOnce<span class=\"token punctuation\">.<\/span><span class=\"token function\">Do<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">func<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u521b\u5efa\u4e00\u4e2a\u65b0\u7684etcd\u5ba2\u6237\u7aef&#xff0c;\u8fde\u63a5\u5230\u6307\u5b9a\u7684etcd\u670d\u52a1\u5668<\/span><br \/>\nclient<span class=\"token punctuation\">,<\/span> err <span class=\"token operator\">:&#061;<\/span> etcdv3<span class=\"token punctuation\">.<\/span><span class=\"token function\">New<\/span><span class=\"token punctuation\">(<\/span>etcdv3<span class=\"token punctuation\">.<\/span>Config<span class=\"token punctuation\">{<\/span><br \/>\nEndpoints<span class=\"token punctuation\">:<\/span>   etcdServers<span class=\"token punctuation\">,<\/span>     <span class=\"token comment\">\/\/ etcd \u670d\u52a1\u5668\u7684\u5730\u5740\u5217\u8868<\/span><br \/>\nDialTimeout<span class=\"token punctuation\">:<\/span> <span class=\"token number\">3<\/span> <span class=\"token operator\">*<\/span> time<span class=\"token punctuation\">.<\/span>Second<span class=\"token punctuation\">,<\/span> <span class=\"token comment\">\/\/ \u8fde\u63a5\u8d85\u65f6\u65f6\u95f4<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">if<\/span> err <span class=\"token operator\">!&#061;<\/span> <span class=\"token boolean\">nil<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5982\u679c\u8fde\u63a5etcd\u670d\u52a1\u5668\u5931\u8d25&#xff0c;\u8bb0\u5f55\u9519\u8bef\u5e76\u7ec8\u6b62\u7a0b\u5e8f<\/span><br \/>\nutils<span class=\"token punctuation\">.<\/span>Log<span class=\"token punctuation\">.<\/span><span class=\"token function\">Fatal<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8fde\u63a5etcd\u5931\u8d25:&#034;<\/span><span class=\"token punctuation\">,<\/span> err<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u521d\u59cb\u5316\u4e00\u4e2a\u65b0\u7684EtcdServiceHub\u5b9e\u4f8b<\/span><br \/>\netcdServiceHub <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>EtcdServiceHub<span class=\"token punctuation\">{<\/span><br \/>\nclient<span class=\"token punctuation\">:<\/span>             client<span class=\"token punctuation\">,<\/span>                      <span class=\"token comment\">\/\/ \u8bbe\u7f6eetcd\u5ba2\u6237\u7aef<\/span><br \/>\nheartbeatFrequency<span class=\"token punctuation\">:<\/span> heartbeatFrequency<span class=\"token punctuation\">,<\/span>          <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u5fc3\u8df3\u9891\u7387<\/span><br \/>\nloadBalancer<span class=\"token punctuation\">:<\/span>       <span class=\"token operator\">&amp;<\/span>load_balancer<span class=\"token punctuation\">.<\/span>RoundRobin<span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token comment\">\/\/ \u4f7f\u7528Round-Robin\u8d1f\u8f7d\u5747\u8861\u7b56\u7565<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8fd4\u56de\u5df2\u521d\u59cb\u5316\u7684etcdServiceHub\u5b9e\u4f8b<\/span><br \/>\n<span class=\"token keyword\">return<\/span> etcdServiceHub<br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ RegisterService \u6ce8\u518c\u670d\u52a1\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/ \u7b2c\u4e00\u6b21\u6ce8\u518c\u65f6&#xff0c;\u4f1a\u5411etcd\u5199\u5165\u4e00\u4e2akey&#xff0c;\u5e76\u521b\u5efa\u4e00\u4e2a\u79df\u7ea6&#xff1b;\u540e\u7eed\u6ce8\u518c\u4ec5\u8fdb\u884c\u7eed\u7ea6\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/<\/span><br \/>\n<span class=\"token comment\">\/\/ \u53c2\u6570:<\/span><br \/>\n<span class=\"token comment\">\/\/   &#8211; service: \u5fae\u670d\u52a1\u7684\u540d\u79f0\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/   &#8211; endpoint: \u5fae\u670d\u52a1\u670d\u52a1\u5668\u7684\u5730\u5740\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/   &#8211; leaseId: \u79df\u7ea6ID&#xff0c;\u7b2c\u4e00\u6b21\u6ce8\u518c\u65f6\u5e94\u7f6e\u4e3a0\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8fd4\u56de\u503c:<\/span><br \/>\n<span class=\"token comment\">\/\/   &#8211; etcdv3.LeaseID: \u8fd4\u56de\u79df\u7ea6ID\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/   &#8211; error: \u8fd4\u56de\u9519\u8bef\u4fe1\u606f&#xff0c;\u5982\u679c\u64cd\u4f5c\u6210\u529f\u5219\u4e3anil\u3002<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token punctuation\">(<\/span>hub <span class=\"token operator\">*<\/span>EtcdServiceHub<span class=\"token punctuation\">)<\/span> <span class=\"token function\">RegisterService<\/span><span class=\"token punctuation\">(<\/span>service<span class=\"token punctuation\">,<\/span> endpoint <span class=\"token builtin\">string<\/span><span class=\"token punctuation\">,<\/span> leaseId etcdv3<span class=\"token punctuation\">.<\/span>LeaseID<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">(<\/span>etcdv3<span class=\"token punctuation\">.<\/span>LeaseID<span class=\"token punctuation\">,<\/span> <span class=\"token builtin\">error<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u68c0\u67e5\u662f\u5426\u4e3a\u9996\u6b21\u6ce8\u518c&#xff08;\u79df\u7ea6ID\u662f\u5426\u5c0f\u4e8e\u7b49\u4e8e0&#xff09;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> leaseId <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u9996\u6b21\u6ce8\u518c: \u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u79df\u7ea6&#xff0c;\u79df\u7ea6\u7684\u6709\u6548\u671f\u4e3aheartbeatFrequency\u79d2<\/span><br \/>\nleaseGrantResponse<span class=\"token punctuation\">,<\/span> err <span class=\"token operator\">:&#061;<\/span> hub<span class=\"token punctuation\">.<\/span>client<span class=\"token punctuation\">.<\/span><span class=\"token function\">Grant<\/span><span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">.<\/span><span class=\"token function\">Background<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> hub<span class=\"token punctuation\">.<\/span>heartbeatFrequency<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">if<\/span> err <span class=\"token operator\">!&#061;<\/span> <span class=\"token boolean\">nil<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5982\u679c\u521b\u5efa\u79df\u7ea6\u5931\u8d25&#xff0c;\u8bb0\u5f55\u9519\u8bef\u5e76\u8fd4\u56de<\/span><br \/>\nutils<span class=\"token punctuation\">.<\/span>Log<span class=\"token punctuation\">.<\/span><span class=\"token function\">Printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u521b\u5efa\u79df\u7ea6\u5931\u8d25: %v&#034;<\/span><span class=\"token punctuation\">,<\/span> err<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> err<br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/ \u6784\u5efa\u670d\u52a1\u5728etcd\u4e2d\u7684key&#xff0c;\u8def\u5f84\u5f62\u5982: \/{ServiceRootPath}\/{service}\/{endpoint}<\/span><br \/>\nkey <span class=\"token operator\">:&#061;<\/span> strings<span class=\"token punctuation\">.<\/span><span class=\"token function\">TrimRight<\/span><span class=\"token punctuation\">(<\/span>ServiceRootPath<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\/&#034;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\/&#034;<\/span> <span class=\"token operator\">&#043;<\/span> service <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\/&#034;<\/span> <span class=\"token operator\">&#043;<\/span> endpoint<br \/>\n<span class=\"token comment\">\/\/ \u5c06\u670d\u52a1\u6ce8\u518c\u5230etcd\u4e2d&#xff0c;\u5e76\u5c06\u79df\u7ea6\u4e0e\u8be5\u670d\u52a1\u7ed1\u5b9a<\/span><br \/>\n<span class=\"token boolean\">_<\/span><span class=\"token punctuation\">,<\/span> err <span class=\"token operator\">&#061;<\/span> hub<span class=\"token punctuation\">.<\/span>client<span class=\"token punctuation\">.<\/span><span class=\"token function\">Put<\/span><span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">.<\/span><span class=\"token function\">Background<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> key<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;&#034;<\/span><span class=\"token punctuation\">,<\/span> etcdv3<span class=\"token punctuation\">.<\/span><span class=\"token function\">WithLease<\/span><span class=\"token punctuation\">(<\/span>leaseGrantResponse<span class=\"token punctuation\">.<\/span>ID<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">if<\/span> err <span class=\"token operator\">!&#061;<\/span> <span class=\"token boolean\">nil<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5982\u679c\u6ce8\u518c\u670d\u52a1\u5931\u8d25&#xff0c;\u8bb0\u5f55\u9519\u8bef\u5e76\u8fd4\u56de<\/span><br \/>\nutils<span class=\"token punctuation\">.<\/span>Log<span class=\"token punctuation\">.<\/span><span class=\"token function\">Printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u670d\u52a1\u6ce8\u518c\u5931\u8d25: %v&#034;<\/span><span class=\"token punctuation\">,<\/span> err<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">return<\/span> leaseGrantResponse<span class=\"token punctuation\">.<\/span>ID<span class=\"token punctuation\">,<\/span> err<br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\nutils<span class=\"token punctuation\">.<\/span>Log<span class=\"token punctuation\">.<\/span><span class=\"token function\">Printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6210\u529f\u6ce8\u518c\u670d\u52a1: %v&#034;<\/span><span class=\"token punctuation\">,<\/span> key<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8fd4\u56de\u65b0\u7684\u79df\u7ea6ID<\/span><br \/>\n<span class=\"token keyword\">return<\/span> leaseGrantResponse<span class=\"token punctuation\">.<\/span>ID<span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">nil<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u7eed\u7ea6: \u901a\u8fc7\u79df\u7ea6ID\u8fdb\u884c\u7eed\u79df\u64cd\u4f5c<\/span><br \/>\n<span class=\"token boolean\">_<\/span><span class=\"token punctuation\">,<\/span> err <span class=\"token operator\">:&#061;<\/span> hub<span class=\"token punctuation\">.<\/span>client<span class=\"token punctuation\">.<\/span><span class=\"token function\">KeepAliveOnce<\/span><span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">.<\/span><span class=\"token function\">Background<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> leaseId<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">if<\/span> errors<span class=\"token punctuation\">.<\/span><span class=\"token function\">Is<\/span><span class=\"token punctuation\">(<\/span>err<span class=\"token punctuation\">,<\/span> rpctypes<span class=\"token punctuation\">.<\/span>ErrLeaseNotFound<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5982\u679c\u7eed\u79df\u65f6\u53d1\u73b0\u79df\u7ea6\u4e0d\u5b58\u5728&#xff0c;\u5219\u91cd\u65b0\u6ce8\u518c\u670d\u52a1&#xff0c;\u5c06leaseID\u7f6e\u4e3a0\u91cd\u65b0\u8fdb\u884c\u6ce8\u518c<\/span><br \/>\nutils<span class=\"token punctuation\">.<\/span>Log<span class=\"token punctuation\">.<\/span><span class=\"token function\">Printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u672a\u627e\u5230\u79df\u7ea6&#xff0c;\u91cd\u65b0\u6ce8\u518c\u670d\u52a1&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">return<\/span> hub<span class=\"token punctuation\">.<\/span><span class=\"token function\">RegisterService<\/span><span class=\"token punctuation\">(<\/span>service<span class=\"token punctuation\">,<\/span> endpoint<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> err <span class=\"token operator\">!&#061;<\/span> <span class=\"token boolean\">nil<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5982\u679c\u7eed\u79df\u8fc7\u7a0b\u4e2d\u53d1\u751f\u5176\u4ed6\u9519\u8bef&#xff0c;\u8bb0\u5f55\u9519\u8bef\u5e76\u8fd4\u56de<\/span><br \/>\nutils<span class=\"token punctuation\">.<\/span>Log<span class=\"token punctuation\">.<\/span><span class=\"token function\">Printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7eed\u79df\u5931\u8d25: %v&#034;<\/span><span class=\"token punctuation\">,<\/span> err<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> err<br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5982\u679c\u7eed\u79df\u6210\u529f&#xff0c;\u5219\u8fd4\u56de\u73b0\u6709\u7684\u79df\u7ea6ID<\/span><br \/>\n<span class=\"token keyword\">return<\/span> leaseId<span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">nil<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ UnregisterService \u4e3b\u52a8\u6ce8\u9500\u670d\u52a1\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/ \u4eceetcd\u4e2d\u5220\u9664\u670d\u52a1\u7684\u6ce8\u518c\u4fe1\u606f\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/<\/span><br \/>\n<span class=\"token comment\">\/\/ \u53c2\u6570:<\/span><br \/>\n<span class=\"token comment\">\/\/   &#8211; service: \u5fae\u670d\u52a1\u7684\u540d\u79f0\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/   &#8211; endpoint: \u5fae\u670d\u52a1\u670d\u52a1\u5668\u7684\u5730\u5740\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8fd4\u56de\u503c:<\/span><br \/>\n<span class=\"token comment\">\/\/   &#8211; error: \u8fd4\u56de\u9519\u8bef\u4fe1\u606f&#xff0c;\u5982\u679c\u64cd\u4f5c\u6210\u529f\u5219\u4e3anil\u3002<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token punctuation\">(<\/span>hub <span class=\"token operator\">*<\/span>EtcdServiceHub<span class=\"token punctuation\">)<\/span> <span class=\"token function\">UnregisterService<\/span><span class=\"token punctuation\">(<\/span>service <span class=\"token builtin\">string<\/span><span class=\"token punctuation\">,<\/span> endpoint <span class=\"token builtin\">string<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token builtin\">error<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u6784\u5efa\u670d\u52a1\u5728etcd\u4e2d\u7684key&#xff0c;\u8def\u5f84\u5f62\u5982: \/{ServiceRootPath}\/{service}\/{endpoint}<\/span><br \/>\nkey <span class=\"token operator\">:&#061;<\/span> strings<span class=\"token punctuation\">.<\/span><span class=\"token function\">TrimRight<\/span><span class=\"token punctuation\">(<\/span>ServiceRootPath<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\/&#034;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\/&#034;<\/span> <span class=\"token operator\">&#043;<\/span> service <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\/&#034;<\/span> <span class=\"token operator\">&#043;<\/span> endpoint<\/p>\n<p><span class=\"token comment\">\/\/ \u4eceetcd\u4e2d\u5220\u9664\u670d\u52a1\u6ce8\u518c\u4fe1\u606f<\/span><br \/>\n<span class=\"token boolean\">_<\/span><span class=\"token punctuation\">,<\/span> err <span class=\"token operator\">:&#061;<\/span> hub<span class=\"token punctuation\">.<\/span>client<span class=\"token punctuation\">.<\/span><span class=\"token function\">Delete<\/span><span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">.<\/span><span class=\"token function\">Background<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> key<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">if<\/span> err <span class=\"token operator\">!&#061;<\/span> <span class=\"token boolean\">nil<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5982\u679c\u5220\u9664\u64cd\u4f5c\u5931\u8d25&#xff0c;\u8bb0\u5f55\u9519\u8bef\u5e76\u8fd4\u56de<\/span><br \/>\nutils<span class=\"token punctuation\">.<\/span>Log<span class=\"token punctuation\">.<\/span><span class=\"token function\">Printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6ce8\u9500\u670d\u52a1\u5931\u8d25: %v&#034;<\/span><span class=\"token punctuation\">,<\/span> err<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">return<\/span> err<br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6210\u529f\u6ce8\u9500\u670d\u52a1&#xff0c;\u8bb0\u5f55\u65e5\u5fd7<\/span><br \/>\nutils<span class=\"token punctuation\">.<\/span>Log<span class=\"token punctuation\">.<\/span><span class=\"token function\">Printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6210\u529f\u6ce8\u9500\u670d\u52a1: %v&#034;<\/span><span class=\"token punctuation\">,<\/span> key<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token boolean\">nil<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ GetServiceEndpoints \u670d\u52a1\u53d1\u73b0\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/ \u4eceetcd\u4e2d\u67e5\u8be2\u6307\u5b9a\u670d\u52a1\u7684\u6240\u6709endpoint&#xff0c;\u5e76\u8fd4\u56de\u8fd9\u4e9bendpoint\u7684\u5217\u8868\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/ \u53c2\u6570:<\/span><br \/>\n<span class=\"token comment\">\/\/   &#8211; service: \u5fae\u670d\u52a1\u7684\u540d\u79f0\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8fd4\u56de\u503c:<\/span><br \/>\n<span class=\"token comment\">\/\/   &#8211; []string: \u5305\u542b\u6240\u6709\u670d\u52a1endpoint\u7684\u5217\u8868\u3002\u5982\u679c\u67e5\u8be2\u5931\u8d25&#xff0c;\u5219\u8fd4\u56denil\u3002<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token punctuation\">(<\/span>hub <span class=\"token operator\">*<\/span>EtcdServiceHub<span class=\"token punctuation\">)<\/span> <span class=\"token function\">GetServiceEndpoints<\/span><span class=\"token punctuation\">(<\/span>service <span class=\"token builtin\">string<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token builtin\">string<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u6784\u9020\u670d\u52a1\u7684key\u524d\u7f00&#xff0c;\u7528\u4e8e\u83b7\u53d6\u670d\u52a1\u7684\u6240\u6709endpoint<\/span><br \/>\nprefix <span class=\"token operator\">:&#061;<\/span> strings<span class=\"token punctuation\">.<\/span><span class=\"token function\">TrimRight<\/span><span class=\"token punctuation\">(<\/span>ServiceRootPath<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\/&#034;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\/&#034;<\/span> <span class=\"token operator\">&#043;<\/span> service <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\/&#034;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4eceetcd\u4e2d\u83b7\u53d6\u4ee5\u6307\u5b9a\u524d\u7f00\u4e3a\u5f00\u5934\u7684\u6240\u6709key-value\u5bf9<\/span><br \/>\ngetResponse<span class=\"token punctuation\">,<\/span> err <span class=\"token operator\">:&#061;<\/span> hub<span class=\"token punctuation\">.<\/span>client<span class=\"token punctuation\">.<\/span><span class=\"token function\">Get<\/span><span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">.<\/span><span class=\"token function\">Background<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> prefix<span class=\"token punctuation\">,<\/span> etcdv3<span class=\"token punctuation\">.<\/span><span class=\"token function\">WithPrefix<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">if<\/span> err <span class=\"token operator\">!&#061;<\/span> <span class=\"token boolean\">nil<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5982\u679c\u83b7\u53d6\u670d\u52a1endpoint\u5931\u8d25&#xff0c;\u8bb0\u5f55\u9519\u8bef\u5e76\u8fd4\u56denil<\/span><br \/>\nutils<span class=\"token punctuation\">.<\/span>Log<span class=\"token punctuation\">.<\/span><span class=\"token function\">Printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4eceetcd\u83b7\u53d6\u670d\u52a1\u7aef\u70b9\u5931\u8d25: %v&#034;<\/span><span class=\"token punctuation\">,<\/span> err<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token boolean\">nil<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6784\u9020\u8fd4\u56de\u7684endpoint\u5217\u8868<\/span><br \/>\nendpoints <span class=\"token operator\">:&#061;<\/span> <span class=\"token function\">make<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token builtin\">string<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">len<\/span><span class=\"token punctuation\">(<\/span>getResponse<span class=\"token punctuation\">.<\/span>Kvs<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">for<\/span> <span class=\"token boolean\">_<\/span><span class=\"token punctuation\">,<\/span> kv <span class=\"token operator\">:&#061;<\/span> <span class=\"token keyword\">range<\/span> getResponse<span class=\"token punctuation\">.<\/span>Kvs <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u4ecekey\u4e2d\u63d0\u53d6endpoint<\/span><br \/>\npath <span class=\"token operator\">:&#061;<\/span> strings<span class=\"token punctuation\">.<\/span><span class=\"token function\">Split<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">string<\/span><span class=\"token punctuation\">(<\/span>kv<span class=\"token punctuation\">.<\/span>Key<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\/&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\nendpoints <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">append<\/span><span class=\"token punctuation\">(<\/span>endpoints<span class=\"token punctuation\">,<\/span> path<span class=\"token punctuation\">[<\/span><span class=\"token function\">len<\/span><span class=\"token punctuation\">(<\/span>path<span class=\"token punctuation\">)<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8bb0\u5f55\u83b7\u53d6\u5230\u7684\u670d\u52a1endpoint<\/span><br \/>\nutils<span class=\"token punctuation\">.<\/span>Log<span class=\"token punctuation\">.<\/span><span class=\"token function\">Printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6700\u65b0\u7684\u670d\u52a1\u7aef\u70b9: %v&#034;<\/span><span class=\"token punctuation\">,<\/span> endpoints<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">return<\/span> endpoints<br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ GetServiceEndpoint \u6839\u636e\u8d1f\u8f7d\u5747\u8861\u7b56\u7565\u4ece\u670d\u52a1\u7aef\u70b9\u4e2d\u9009\u62e9\u4e00\u4e2a\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/ \u901a\u8fc7\u8c03\u7528\u8d1f\u8f7d\u5747\u8861\u7b56\u7565\u7684Take\u65b9\u6cd5&#xff0c;\u4ece\u83b7\u53d6\u7684\u670d\u52a1\u7aef\u70b9\u5217\u8868\u4e2d\u9009\u62e9\u4e00\u4e2a\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/<\/span><br \/>\n<span class=\"token comment\">\/\/ \u53c2\u6570:<\/span><br \/>\n<span class=\"token comment\">\/\/   &#8211; service: \u5fae\u670d\u52a1\u7684\u540d\u79f0\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8fd4\u56de\u503c:<\/span><br \/>\n<span class=\"token comment\">\/\/   &#8211; string: \u9009\u62e9\u7684\u670d\u52a1\u7aef\u70b9\u5730\u5740\u3002<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token punctuation\">(<\/span>hub <span class=\"token operator\">*<\/span>EtcdServiceHub<span class=\"token punctuation\">)<\/span> <span class=\"token function\">GetServiceEndpoint<\/span><span class=\"token punctuation\">(<\/span>service <span class=\"token builtin\">string<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token builtin\">string<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u83b7\u53d6\u6307\u5b9a\u670d\u52a1\u7684\u6240\u6709\u7aef\u70b9<\/span><br \/>\nendpoints <span class=\"token operator\">:&#061;<\/span> hub<span class=\"token punctuation\">.<\/span><span class=\"token function\">GetServiceEndpoints<\/span><span class=\"token punctuation\">(<\/span>service<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\">\/\/ \u4f7f\u7528\u8d1f\u8f7d\u5747\u8861\u7b56\u7565\u9009\u62e9\u4e00\u4e2a\u7aef\u70b9<\/span><br \/>\n<span class=\"token keyword\">return<\/span> hub<span class=\"token punctuation\">.<\/span>loadBalancer<span class=\"token punctuation\">.<\/span><span class=\"token function\">Take<\/span><span class=\"token punctuation\">(<\/span>endpoints<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ Close \u5173\u95edetcd\u5ba2\u6237\u7aef\u8fde\u63a5\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/ \u91ca\u653eetcd\u5ba2\u6237\u7aef\u5360\u7528\u7684\u8d44\u6e90&#xff0c;\u5e76\u8bb0\u5f55\u5173\u95ed\u8fde\u63a5\u7684\u72b6\u6001\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8fd4\u56de\u503c:<\/span><br \/>\n<span class=\"token comment\">\/\/   &#8211; \u65e0<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token punctuation\">(<\/span>hub <span class=\"token operator\">*<\/span>EtcdServiceHub<span class=\"token punctuation\">)<\/span> <span class=\"token function\">Close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5c1d\u8bd5\u5173\u95edetcd\u5ba2\u6237\u7aef\u8fde\u63a5<\/span><br \/>\nerr <span class=\"token operator\">:&#061;<\/span> hub<span class=\"token punctuation\">.<\/span>client<span class=\"token punctuation\">.<\/span><span class=\"token function\">Close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">if<\/span> err <span class=\"token operator\">!&#061;<\/span> <span class=\"token boolean\">nil<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5982\u679c\u5173\u95ed\u8fde\u63a5\u5931\u8d25&#xff0c;\u8bb0\u5f55\u9519\u8bef\u65e5\u5fd7<\/span><br \/>\nutils<span class=\"token punctuation\">.<\/span>Log<span class=\"token punctuation\">.<\/span><span class=\"token function\">Printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5173\u95edetcd\u5ba2\u6237\u7aef\u8fde\u63a5\u5931\u8d25: %v&#034;<\/span><span class=\"token punctuation\">,<\/span> err<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>ETCD\u63d0\u4f9bAPI\u7528\u4e8e\u670d\u52a1\u7684\u6ce8\u518c\u4e0e\u53d1\u73b0\u3002<\/li>\n<li>\u670d\u52a1\u4e2d\u5fc3\u7684\u6838\u5fc3\u662fclient&#xff0c;\u7528\u4e8e\u8fde\u63a5\u5230ETCD\u3002<\/li>\n<li>\u670d\u52a1\u6ce8\u518c\u540e&#xff0c;\u9700\u8981\u5b9a\u671f\u4e0a\u62a5\u5fc3\u8df3\u4ee5\u4fdd\u6301\u5b58\u6d3b\u72b6\u6001\u3002<\/li>\n<li>service worker\u5355\u72ec\u90e8\u7f72\u5728\u670d\u52a1\u5668\u4e0a&#xff0c;\u8fde\u63a5service hub\u4f7f\u7528\u5355\u4f8b\u6a21\u5f0f\u3002<\/li>\n<li>\u901a\u8fc7once\u5b9e\u73b0\u5355\u4f8b\u6a21\u5f0f&#xff0c;\u5224\u65ad\u662f\u5426\u5df2\u521b\u5efa\u5b9e\u4f8b\u3002<\/li>\n<li>\u4f7f\u7528ETCD new\u65b9\u6cd5\u8fde\u63a5&#xff0c;\u4f20\u5165endpoints\u548c\u914d\u7f6e\u4fe1\u606f\u3002<\/li>\n<li>\u914d\u7f6e\u4e2d\u6838\u5fc3\u662fendpoints&#xff0c;\u9700\u8981\u63d0\u4f9bETCD\u96c6\u7fa4\u7684\u591a\u4e2aIP\u3002<\/li>\n<li>\u8fde\u63a5\u8d85\u65f6\u8bbe\u7f6e\u4e3a3\u79d2&#xff0c;\u786e\u4fdd\u8fde\u63a5\u53ef\u9760\u6027\u3002<\/li>\n<li>\u670d\u52a1\u542f\u52a8\u65f6&#xff0c;\u9996\u5148\u7533\u8bf7\u79df\u7ea6\u5e76\u83b7\u53d6\u79df\u7ea6ID\u3002<\/li>\n<li>\u5c06\u670d\u52a1\u4fe1\u606f&#xff08;service name &#043; ip:port&#xff09;\u6ce8\u518c\u5230ETCD\u4e2d&#xff0c;\u5e76\u8bbe\u7f6e\u79df\u7ea6\u3002<\/li>\n<li>\u5b9a\u671f\u7eed\u79df\u4ee5\u4fdd\u6301\u670d\u52a1\u5b58\u6d3b\u72b6\u6001\u3002<\/li>\n<li>\u5982\u679c\u79df\u7ea6ID\u4e0d\u5b58\u5728&#xff0c;\u5219\u91cd\u65b0\u6ce8\u518c\u670d\u52a1\u3002<\/li>\n<li>\u63d0\u4f9b\u6ce8\u9500\u51fd\u6570&#xff0c;\u4f20\u5165service name\u548cendpoint IP\u3002<\/li>\n<li>\u4eceETCD\u4e2d\u5220\u9664\u5bf9\u5e94\u7684key&#xff0c;\u5b8c\u6210\u6ce8\u9500\u3002<\/li>\n<li>\u670d\u52a1\u8c03\u7528\u65b9\u901a\u8fc7get service\u51fd\u6570\u83b7\u53d6\u670d\u52a1\u5217\u8868\u3002<\/li>\n<li>\u4f20\u5165service name\u4f5c\u4e3a\u524d\u7f00&#xff0c;\u67e5\u8be2\u6ee1\u8db3\u524d\u7f00\u7684key\u3002<\/li>\n<li>\u8fd4\u56de\u6240\u6709\u5339\u914dkey\u7684IP\u5217\u8868&#xff0c;\u4f9b\u8c03\u7528\u65b9\u9009\u62e9\u3002<\/li>\n<\/ul>\n<hr \/>\n<ul>\n<li>\u7b56\u7565\u6a21\u5f0f<\/li>\n<\/ul>\n<p><span class=\"token comment\">\/\/ GetServiceEndpoint \u6839\u636e\u8d1f\u8f7d\u5747\u8861\u7b56\u7565\u4ece\u670d\u52a1\u7aef\u70b9\u4e2d\u9009\u62e9\u4e00\u4e2a\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/ \u901a\u8fc7\u8c03\u7528\u8d1f\u8f7d\u5747\u8861\u7b56\u7565\u7684Take\u65b9\u6cd5&#xff0c;\u4ece\u83b7\u53d6\u7684\u670d\u52a1\u7aef\u70b9\u5217\u8868\u4e2d\u9009\u62e9\u4e00\u4e2a\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/<\/span><br \/>\n<span class=\"token comment\">\/\/ \u53c2\u6570:<\/span><br \/>\n<span class=\"token comment\">\/\/   &#8211; service: \u5fae\u670d\u52a1\u7684\u540d\u79f0\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8fd4\u56de\u503c:<\/span><br \/>\n<span class=\"token comment\">\/\/   &#8211; string: \u9009\u62e9\u7684\u670d\u52a1\u7aef\u70b9\u5730\u5740\u3002<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token punctuation\">(<\/span>hub <span class=\"token operator\">*<\/span>EtcdServiceHub<span class=\"token punctuation\">)<\/span> <span class=\"token function\">GetServiceEndpoint<\/span><span class=\"token punctuation\">(<\/span>service <span class=\"token builtin\">string<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token builtin\">string<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u83b7\u53d6\u6307\u5b9a\u670d\u52a1\u7684\u6240\u6709\u7aef\u70b9<\/span><br \/>\nendpoints <span class=\"token operator\">:&#061;<\/span> hub<span class=\"token punctuation\">.<\/span><span class=\"token function\">GetServiceEndpoints<\/span><span class=\"token punctuation\">(<\/span>service<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\">\/\/ \u4f7f\u7528\u8d1f\u8f7d\u5747\u8861\u7b56\u7565\u9009\u62e9\u4e00\u4e2a\u7aef\u70b9<\/span><br \/>\n<span class=\"token keyword\">return<\/span> hub<span class=\"token punctuation\">.<\/span>loadBalancer<span class=\"token punctuation\">.<\/span><span class=\"token function\">Take<\/span><span class=\"token punctuation\">(<\/span>endpoints<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>\u7531\u4e8e\u8c03\u7528\u65b9\u5e0c\u671b\u76f4\u63a5\u83b7\u53d6\u4e00\u53f0\u670d\u52a1\u5668\u8fdb\u884c\u63a5\u53e3\u901a\u4fe1&#xff0c;\u670d\u52a1\u4e2d\u5fc3\u901a\u8fc7\u7b56\u7565\u6a21\u5f0f&#xff0c;\u5c06\u8d1f\u8f7d\u5747\u8861\u7b97\u6cd5\u7684\u5b9e\u73b0\u4ea4\u7ed9\u5916\u90e8&#xff0c;\u91c7\u7528\u63a5\u53e3\u65b9\u5f0f\u5b9a\u4e49\u8d1f\u8f7d\u5747\u8861\u7b56\u7565&#xff0c;\u5e76\u5c55\u793a\u4e86\u8f6e\u8be2\u548c\u968f\u673a\u4e24\u79cd\u7b80\u5355\u7684\u8d1f\u8f7d\u5747\u8861\u7b56\u7565\u5b9e\u73b0&#xff0c;\u5f3a\u8c03\u4e86\u5728\u5e76\u53d1\u73af\u5883\u4e0b\u786e\u4fdd\u7d2f\u52a0\u64cd\u4f5c\u7684\u7ebf\u7a0b\u5b89\u5168\u6027\u3002<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250608072724-68453b5c1a024.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p><span class=\"token keyword\">package<\/span> load_balancer<\/p>\n<p><span class=\"token comment\">\/\/ LoadBalancer \u8d1f\u8f7d\u5747\u8861\u63a5\u53e3&#xff0c;\u5b9a\u4e49\u9009\u62e9Endpoint\u7684\u65b9\u6cd5<\/span><br \/>\n<span class=\"token keyword\">type<\/span> LoadBalancer <span class=\"token keyword\">interface<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ Take \u4ece\u7ed9\u5b9a\u7684\u7aef\u70b9\u5217\u8868\u4e2d\u9009\u62e9\u4e00\u4e2a<\/span><br \/>\n<span class=\"token function\">Take<\/span><span class=\"token punctuation\">(<\/span>endpoints <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token builtin\">string<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token builtin\">string<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token string\">&#034;math\/rand&#034;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ RandomSelect \u8d1f\u8f7d\u5747\u8861\u7b97\u6cd5&#xff1a;\u968f\u673a\u9009\u62e9\u6cd5<\/span><br \/>\n<span class=\"token comment\">\/\/ \u968f\u673a\u9009\u62e9\u7b97\u6cd5\u4ece\u5217\u8868\u4e2d\u968f\u673a\u9009\u62e9\u4e00\u4e2a\u7aef\u70b9<\/span><br \/>\n<span class=\"token keyword\">type<\/span> RandomSelect <span class=\"token keyword\">struct<\/span><span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ Take \u9009\u62e9\u4e00\u4e2aEndpoint&#xff0c;\u6839\u636e\u968f\u673a\u9009\u62e9\u7b97\u6cd5<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token punctuation\">(<\/span>b <span class=\"token operator\">*<\/span>RandomSelect<span class=\"token punctuation\">)<\/span> <span class=\"token function\">Take<\/span><span class=\"token punctuation\">(<\/span>endpoints <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token builtin\">string<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token builtin\">string<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token function\">len<\/span><span class=\"token punctuation\">(<\/span>endpoints<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;&#034;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/ \u4ece\u7aef\u70b9\u5217\u8868\u4e2d\u968f\u673a\u9009\u62e9\u4e00\u4e2a\u7d22\u5f15<\/span><br \/>\nindex <span class=\"token operator\">:&#061;<\/span> rand<span class=\"token punctuation\">.<\/span><span class=\"token function\">Intn<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">len<\/span><span class=\"token punctuation\">(<\/span>endpoints<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">return<\/span> endpoints<span class=\"token punctuation\">[<\/span>index<span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token string\">&#034;sync\/atomic&#034;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ RoundRobin \u8d1f\u8f7d\u5747\u8861\u7b97\u6cd5&#xff1a;\u8f6e\u8be2\u6cd5<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8f6e\u8be2\u6cd5\u786e\u4fdd\u6bcf\u4e2a\u8bf7\u6c42\u8f6e\u6d41\u88ab\u5206\u914d\u5230\u5217\u8868\u4e2d\u7684\u6bcf\u4e2a\u7aef\u70b9<\/span><br \/>\n<span class=\"token keyword\">type<\/span> RoundRobin <span class=\"token keyword\">struct<\/span> <span class=\"token punctuation\">{<\/span><br \/>\nacc <span class=\"token builtin\">int64<\/span> <span class=\"token comment\">\/\/ \u8bb0\u5f55\u7d2f\u8ba1\u8bf7\u6c42\u6b21\u6570<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ Take \u9009\u62e9\u4e00\u4e2aEndpoint&#xff0c;\u6839\u636e\u8f6e\u8be2\u7b97\u6cd5<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token punctuation\">(<\/span>b <span class=\"token operator\">*<\/span>RoundRobin<span class=\"token punctuation\">)<\/span> <span class=\"token function\">Take<\/span><span class=\"token punctuation\">(<\/span>endpoints <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token builtin\">string<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token builtin\">string<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token function\">len<\/span><span class=\"token punctuation\">(<\/span>endpoints<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;&#034;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/ \u7ebf\u7a0b\u5b89\u5168\u5730\u589e\u52a0\u8bf7\u6c42\u6b21\u6570<\/span><br \/>\nn <span class=\"token operator\">:&#061;<\/span> atomic<span class=\"token punctuation\">.<\/span><span class=\"token function\">AddInt64<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>b<span class=\"token punctuation\">.<\/span>acc<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8ba1\u7b97\u8981\u9009\u62e9\u7684Endpoint\u7684\u7d22\u5f15<\/span><br \/>\nindex <span 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