{"id":34664,"date":"2023-02-24T15:43:25","date_gmt":"2023-03-20T03:31:40","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8go-cache-fetcher%e5%ae%a2%e6%88%b7%e7%ab%af%e8%bf%9b%e8%a1%8c%e7%bc%93%e5%ad%98%e6%8f%90%e5%8f%96\/"},"modified":"2024-04-29T16:05:59","modified_gmt":"2024-04-29T08:05:59","slug":"%e4%bd%bf%e7%94%a8go-cache-fetcher%e5%ae%a2%e6%88%b7%e7%ab%af%e8%bf%9b%e8%a1%8c%e7%bc%93%e5%ad%98%e6%8f%90%e5%8f%96","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8go-cache-fetcher%e5%ae%a2%e6%88%b7%e7%ab%af%e8%bf%9b%e8%a1%8c%e7%bc%93%e5%ad%98%e6%8f%90%e5%8f%96\/","title":{"rendered":"\u4f7f\u7528Go Cache Fetcher\u5ba2\u6237\u7aef\u8fdb\u884c\u7f13\u5b58\u63d0\u53d6"},"content":{"rendered":"

\u6211\u5236\u4f5c\u4e86\u4e00\u4e2a\u652f\u6301\u5e38\u89c1\u7684\u7528Redis\u6216\u8005memcache\u8fdb\u884c\u7f13\u5b58\u7684\u6a21\u5f0f\u7684Go\u5ba2\u6237\u7aef\u5e93\u3002\u5c31\u662f\u8fd9\u4e2a\u3002<\/p>\n

\u30a2\u30af\u30bb\u30b9\u3057\u305f\u3044\u60c5\u5831\u3084\u5909\u6570\u304b\u3089\u30ad\u30fc\u540d\u3092\u751f\u6210\u3059\u308b\r\nif (Redis\u306b\u30c7\u30fc\u30bf\u304c\u3042\u308b) {\r\n  Redis\u304b\u3089Get\u3059\u308b\r\n} else {\r\n  Database\u304b\u3089Get\u3057\u305f\u308a\u3001API\u304b\u3089fetch\u3059\u308b\r\n  Redis\u3078Set\u3059\u308b\r\n}\r\n<\/code><\/pre>\n
\u5047\u8bbe\u5728Redis\u4e2d\u4f7f\u7528\uff0c\u5982\u679c\u5b9e\u73b0\u4e86Client\uff0c\u5c31\u53ef\u4ee5\u7528\u4e8e\u4efb\u4f55\u7c7b\u578b\u7684\u7f13\u5b58\u3002
\n\u901a\u8fc7\u4f20\u9012\u51fd\u6570\uff0c\u53ef\u4ee5\u5bf9\u5176\u8fdb\u884c\u7f13\u5b58\uff0c\u56e0\u6b64\u53ef\u4ee5\u7528\u4e8e\u6570\u636e\u5e93\u6216API\u8bbf\u95ee\u3002
\n\u8fd8\u53ef\u4ee5\u5c06\u6570\u636e\u5e8f\u5217\u5316\u540e\u8fdb\u884c\u8bbe\u7f6e\u548c\u83b7\u53d6\u3002<\/p>\n
\u8bf7\u53c2\u9605README\u548c\u6d4b\u8bd5\u4ee3\u7801\u4ee5\u4e86\u89e3\u8be6\u7ec6\u4f7f\u7528\u65b9\u6cd5\u3002<\/p>\n
\u8fdb\u884c\u7f13\u5b58\u83b7\u53d6\u7684\u5ba2\u6237\u7aef<\/h1>\n
\u8fd9\u662f\u4e00\u4e2a\u7528Golang\u7f16\u5199\u7684\u7f13\u5b58\u63d0\u53d6\u5668\u3002<\/p>\n
\u5b89\u88c5<\/h2>\n
go get github.com\/peutes\/cachefetcher\r\n<\/code><\/pre>\n
\u2705 \u652f\u6301 Cash Fetcher \u5ba2\u6237\u7aef\u7684\u57fa\u672c\u903b\u8f91<\/h2>\n
\u4f60\u53ef\u4ee5\u4f7f\u7528Redis\u3001Memcached\u6216\u5176\u4ed6\u7f13\u5b58\u7cfb\u7edf\u6765\u7f13\u5b58\u5404\u79cd\u529f\u80fd\u7684\u54cd\u5e94\u3002
\n\u4f8b\u5982\uff0c\u5f53\u9996\u6b21\u4ece\u529f\u80fd\u4e2d\u83b7\u53d6\u54cd\u5e94\u65f6\uff0c\u53ef\u4ee5\u5c06\u5176\u4fdd\u5b58\u5728Redis\u4e2d\uff0c\u5e76\u83b7\u53d6\u529f\u80fd\u7684\u54cd\u5e94\uff0c
\n\u7136\u540e\uff0c\u5982\u679c\u6709\u7f13\u5b58\uff0c\u53ef\u4ee5\u4eceRedis\u4e2d\u83b7\u53d6\u3002<\/p>\n
\u4ece\u8981\u7d20\u4e2d\u81ea\u52a8\u751f\u6210\u7f13\u5b58\u952e\u3002<\/h2>\n
\u30ad\u30e3\u30c3\u30b7\u30e5\u30ad\u30fc\u306e\u751f\u6210\u30ed\u30b8\u30c3\u30af\u306b\u3064\u3044\u3066\u8003\u3048\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002
\n\u30ad\u30fc\u751f\u6210\u30ed\u30b8\u30c3\u30af\u306f\u30e1\u30a4\u30f3\u30ed\u30b8\u30c3\u30af\u304b\u3089\u96a0\u853d\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u2705 \u7b80\u6d01\u7684\u73b0\u91d1\u63a7\u5236<\/h2>\n
\u7f13\u5b58\u63a7\u5236\u975e\u5e38\u7b80\u5355\uff0c\u53ea\u9700\u8981\u8bbe\u7f6e\u952e\u5e76\u83b7\u53d6\u63d0\u53d6\u5668\u51fd\u6570\u3002<\/p>\n
\u8fd9\u4e2aFetcher\u5ba2\u6237\u7aef\u53ea\u9700\u8981\u4f7f\u7528SetKey\u548cFetch\u51fd\u6570\u5c31\u8db3\u591f\u4e86\u3002Fetch\u51fd\u6570\u4e2d\u9700\u8981\u8bbe\u7f6eFetcher\u51fd\u6570\u3001\u83b7\u53d6\u503c\u7684\u6307\u9488\u4ee5\u53ca\u7f13\u5b58\u7684\u6709\u6548\u671f\u9650\u3002<\/p>\n
    \n
  • \n
      SetKey()<\/ul>\n<\/li>\n<\/ul>\n
       <\/p>\n
        Fetch()<\/ul>\n
        \u5b89\u88c5<\/h2>\n
        go get github.com\/peutes\/go-cache-fetcher-client\r\n<\/code><\/pre>\n
        \u7528\u6cd5 f\u01ce)<\/h2>\n
        fetcher<\/span> :=<\/span> cachefetcher<\/span>.<\/span>NewCacheFetcher<\/span>(<\/span>\r\n  &<\/span>ClientImpl<\/span>{<\/span>\r\n    Rdb<\/span>:<\/span> redis<\/span>.<\/span>NewClient<\/span>(<\/span>&<\/span>redis<\/span>.<\/span>Options<\/span>{<\/span>Addr<\/span>:<\/span> \"localhost:6379\"<\/span>}),<\/span>\r\n  },<\/span>\r\n  nil<\/span>\r\n)<\/span>\r\nfetcher<\/span>.<\/span>SetKey<\/span>([]<\/span>string<\/span>{<\/span>\"prefix\"<\/span>,<\/span> \"str\"<\/span>},<\/span> \"hoge\"<\/span>)<\/span>\r\n\/\/ fetcher.Key() == \"prefix_str_hoge\"<\/span>\r\n\r\n\/\/ \u30d5\u30a7\u30c3\u30c1\u30e3\u30fc\u95a2\u6570\u3002\u305f\u3068\u3048\u3070\u3001DB\u304b\u3089\u8aad\u307f\u8fbc\u307f\u3092\u60f3\u5b9a\u3057\u307e\u3059\u3002<\/span>\r\nread<\/span> :=<\/span> func<\/span>(<\/span>s<\/span> string<\/span>)<\/span> string<\/span> {<\/span>\r\n  return<\/span> s<\/span> +<\/span> \" fetch!!\"<\/span>\r\n}<\/span>\r\n\r\n\/\/ \u6700\u521d\u306e\u30d5\u30a7\u30c3\u30c1\u306f\u30d5\u30a7\u30c3\u30c1\u30e3\u30fc\u95a2\u6570\u304b\u3089\u547c\u3070\u308c\u307e\u3059\u3002\u30ad\u30e3\u30c3\u30b7\u30e5\u306f\u547c\u3070\u308c\u307e\u305b\u3093\u3002<\/span>\r\nvar<\/span> dst<\/span> string<\/span>\r\nerr<\/span> :=<\/span> fetcher<\/span>.<\/span>Fetch<\/span>(<\/span>10<\/span>*<\/span>time<\/span>.<\/span>Second<\/span>,<\/span> &<\/span>dst<\/span>,<\/span> func<\/span>()<\/span> (<\/span>string<\/span>,<\/span> error<\/span>)<\/span> {<\/span>\r\n  return<\/span> read<\/span>(<\/span>\"first\"<\/span>),<\/span> nil<\/span>\r\n})<\/span>\r\n\/\/ dst == \"first fetch!!\" <- get from function<\/span>\r\n\r\n\/\/ \uff12\u56de\u76ee\u306e\u30d5\u30a7\u30c1\u306f\u6709\u52b9\u671f\u9650\u5185\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u304b\u3089\u547c\u3070\u308c\u307e\u3059\u3002\u30d5\u30a7\u30c3\u30c1\u30e3\u30fc\u95a2\u6570\u304b\u3089\u306f\u547c\u3070\u308c\u307e\u305b\u3093\u3002<\/span>\r\nerr<\/span> =<\/span> fetcher<\/span>.<\/span>Fetch<\/span>(<\/span>10<\/span>*<\/span>time<\/span>.<\/span>Second<\/span>,<\/span> &<\/span>dst<\/span>,<\/span> func<\/span>()<\/span> (<\/span>string<\/span>,<\/span> error<\/span>)<\/span> {<\/span>\r\n  return<\/span> read<\/span>(<\/span>\"second\"<\/span>),<\/span> nil<\/span>\r\n})<\/span>\r\n\/\/ dst == \"first fetch!!\" <- get from cache<\/span>\r\n\r\n<\/code><\/pre>\n
        \u88ab\u652f\u6301\u7684\u7c7b\u578b<\/h3>\n
        \u5728\u4e2d\u56fd\u53ea\u9700\u8981\u4e00\u4e2a\u9009\u62e9\u5c06\u4ee5\u4e0b\u5185\u5bb9\u7528\u4e2d\u6587\u672c\u5730\u5316\uff1a<\/p>\n
        \u5173\u952e\u8981\u7d20\u5305\u62ec string \u4ee5\u5916\u7684 int\u3001float\u3001bool\u3001complex\u3001byte\u3001time\u3001slice\u3001array \u548c\u6709 String() \u65b9\u6cd5\u7684 struct\u3002
        \n\u8be5\u5ba2\u6237\u7aef\u652f\u6301\u901a\u8fc7 gob serializer \u8fdb\u884c\u5e8f\u5217\u5316\u3002
        \n\u5e8f\u5217\u5316\u540e\u7684\u5b57\u7b26\u4e32\u5c06\u88ab\u4fdd\u5b58\u5728\u7f13\u5b58\u4e2d\u3002<\/p>\n
        fetcher<\/span>.<\/span>SetKey<\/span>([]<\/span>string<\/span>{<\/span>\"prefix\"<\/span>,<\/span> \"any\"<\/span>},<\/span> 1<\/span>,<\/span> 0.1<\/span>,<\/span> true<\/span>,<\/span> &<\/span>[]<\/span>string<\/span>{<\/span>\"a\"<\/span>,<\/span> \"b\"<\/span>},<\/span> time<\/span>.<\/span>Unix<\/span>(<\/span>0<\/span>,<\/span> 0<\/span>)<\/span>.<\/span>In<\/span>(<\/span>time<\/span>.<\/span>UTC<\/span>))<\/span>\r\n_<\/span> =<\/span> fetcher<\/span>.<\/span>Key<\/span>()<\/span> \/\/ \"prefix_any_1_0.1_true_a_b_1970-01-01_00:00:00_+0000_UTC\"<\/span>\r\n_<\/span> =<\/span> fetcher<\/span>.<\/span>HashKey<\/span>()<\/span> \/\/ \"prefix_any_c94a415eb6e20585f4fbc856b6edcf52007259522967c4bea548515e71531663\"<\/span>\r\n\r\nread<\/span> :=<\/span> func<\/span>()<\/span> ([]<\/span>int<\/span>,<\/span> error<\/span>)<\/span> {<\/span>\r\n  return<\/span> []<\/span>int<\/span>{<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>,<\/span> 4<\/span>,<\/span> 5<\/span>}<\/span>\r\n}<\/span>\r\nvar<\/span> dst<\/span> []<\/span>int<\/span>  \r\nerr<\/span> :=<\/span> fetcher<\/span>.<\/span>Fetch<\/span>(<\/span>10<\/span>*<\/span>time<\/span>.<\/span>Second<\/span>,<\/span> &<\/span>dst<\/span>,<\/span> read<\/span>)<\/span>\r\n\/\/ dst == []int{1, 2, 3, 4, 5}<\/span>\r\n\r\n<\/code><\/pre>\n
        \u8981\u7d20\u53ef\u4ee5\u652f\u6301\u9664\u4e86\u5b57\u7b26\u4e32\u7c7b\u578b\u4e4b\u5916\u7684\u5176\u4ed6\u7c7b\u578b\u3002
        \n\u5982\u679c\u5e0c\u671b\u4f7f\u7528interface{}\u6216\u81ea\u5b9a\u4e49\u7c7b\u578b\uff0c\u53ef\u4ee5\u4f7f\u7528GobRegister()\u8fdb\u884c\u6ce8\u518c\u3002<\/p>\n
            i<\/span> :=<\/span> 10<\/span>\r\n    b<\/span> :=<\/span> true<\/span>\r\n    s<\/span> :=<\/span> \"abc\"<\/span>\r\n    ft<\/span> :=<\/span> 0.123<\/span>\r\n    i8<\/span> :=<\/span> int8<\/span>(<\/span>20<\/span>)<\/span>\r\n    i64<\/span> :=<\/span> int64<\/span>(<\/span>30<\/span>)<\/span>\r\n    ui8<\/span> :=<\/span> uint8<\/span>(<\/span>40<\/span>)<\/span>\r\n    ui64<\/span> :=<\/span> uint64<\/span>(<\/span>50<\/span>)<\/span>\r\n\r\n    e<\/span> :=<\/span> &<\/span>testStruct<\/span>{<\/span>\r\n        I<\/span>:<\/span>     i<\/span>,<\/span>\r\n        B<\/span>:<\/span>     b<\/span>,<\/span>\r\n        S<\/span>:<\/span>     s<\/span>,<\/span>\r\n        F<\/span>:<\/span>     ft<\/span>,<\/span>\r\n        I8<\/span>:<\/span>    i8<\/span>,<\/span>\r\n        I64<\/span>:<\/span>   i64<\/span>,<\/span>\r\n        UI8<\/span>:<\/span>   ui8<\/span>,<\/span>\r\n        UI64<\/span>:<\/span>  ui64<\/span>,<\/span>\r\n        IP<\/span>:<\/span>    &<\/span>i<\/span>,<\/span>\r\n        BP<\/span>:<\/span>    &<\/span>b<\/span>,<\/span>\r\n        SP<\/span>:<\/span>    &<\/span>s<\/span>,<\/span>\r\n        FP<\/span>:<\/span>    &<\/span>ft<\/span>,<\/span>\r\n        I8P<\/span>:<\/span>   &<\/span>i8<\/span>,<\/span>\r\n        I64P<\/span>:<\/span>  &<\/span>i64<\/span>,<\/span>\r\n        UI8P<\/span>:<\/span>  &<\/span>ui8<\/span>,<\/span>\r\n        UI64P<\/span>:<\/span> &<\/span>ui64<\/span>,<\/span>\r\n        IS<\/span>:<\/span>    []<\/span>int<\/span>{<\/span>i<\/span>,<\/span> i<\/span>,<\/span> i<\/span>},<\/span>\r\n        BS<\/span>:<\/span>    []<\/span>bool<\/span>{<\/span>b<\/span>,<\/span> b<\/span>,<\/span> b<\/span>},<\/span>\r\n        SS<\/span>:<\/span>    []<\/span>string<\/span>{<\/span>s<\/span>,<\/span> s<\/span>,<\/span> s<\/span>},<\/span>\r\n        FS<\/span>:<\/span>    []<\/span>float64<\/span>{<\/span>ft<\/span>,<\/span> ft<\/span>,<\/span> ft<\/span>},<\/span>\r\n        IM<\/span>:<\/span>    map<\/span>[<\/span>int<\/span>]<\/span>int<\/span>{<\/span>1<\/span>:<\/span> i<\/span>,<\/span> 2<\/span>:<\/span> i<\/span>,<\/span> 3<\/span>:<\/span> i<\/span>},<\/span>\r\n        BM<\/span>:<\/span>    map<\/span>[<\/span>bool<\/span>]<\/span>bool<\/span>{<\/span>true<\/span>:<\/span> b<\/span>,<\/span> false<\/span>:<\/span> b<\/span>},<\/span>\r\n        SM<\/span>:<\/span>    map<\/span>[<\/span>string<\/span>]<\/span>string<\/span>{<\/span>\"a\"<\/span>:<\/span> s<\/span>,<\/span> \"bb\"<\/span>:<\/span> s<\/span>,<\/span> \"ccc\"<\/span>:<\/span> s<\/span>},<\/span>\r\n        FM<\/span>:<\/span>    map<\/span>[<\/span>float64<\/span>]<\/span>float64<\/span>{<\/span>0.1<\/span>:<\/span> ft<\/span>,<\/span> 0.2<\/span>:<\/span> ft<\/span>,<\/span> 0.3<\/span>:<\/span> ft<\/span>},<\/span>\r\n    }<\/span>\r\n\r\n    var<\/span> dst<\/span> testStruct<\/span>\r\n    f<\/span> :=<\/span> cachefetcher<\/span>.<\/span>NewCacheFetcher<\/span>(<\/span>redisClient<\/span>,<\/span> options<\/span>)<\/span>\r\n    err<\/span> :=<\/span> fetcher<\/span>.<\/span>SetKey<\/span>([]<\/span>string<\/span>{<\/span>\"prefix\"<\/span>,<\/span> \"key\"<\/span>},<\/span> \"struct1\"<\/span>)<\/span>\r\n    err<\/span> =<\/span> fetcher<\/span>.<\/span>Set<\/span>(<\/span>e<\/span>,<\/span> 10<\/span>*<\/span>time<\/span>.<\/span>Second<\/span>)<\/span>\r\n    err<\/span> =<\/span> fetcher<\/span>.<\/span>Get<\/span>(<\/span>&<\/span>dst<\/span>)<\/span>\r\n<\/code><\/pre>\n
        \u5176\u4ed6\u7f13\u5b58\u63a7\u5236<\/h3>\n
        \u5982\u679c\u9700\u8981\u6563\u5217\u952e\uff0c\u53ef\u4ee5\u4f7f\u7528 SetHashKey \u800c\u4e0d\u662f SetKey\u3002<\/p>\n
        \u6bcf\u4e2a\u5143\u7d20\u90fd\u53ef\u4ee5\u4f7f\u7528Set()\u3001Get()\u548cDel()\u65b9\u6cd5\u3002
        \n\u5982\u679c\u9700\u8981\u83b7\u53d6\u952e\uff0c\u5219\u4f7f\u7528Key()\u65b9\u6cd5\u3002
        \n\u5982\u679c\u9700\u8981\u4ee5\u5e03\u5c14\u503c\u7684\u5f62\u5f0f\u83b7\u53d6\u7f13\u5b58\u7ed3\u679c\u662f\u5426\u5b58\u5728\uff0c\u5219\u4f7f\u7528IsCached()\u65b9\u6cd5\u3002<\/p>\n
          \n
        • \n
            SetHashKey()<\/ul>\n<\/li>\n<\/ul>\n
             <\/p>\n
              \n
            • \n
                Set()<\/ul>\n<\/li>\n<\/ul>\n
                 <\/p>\n
                  \n
                • \n
                    Get()<\/ul>\n<\/li>\n<\/ul>\n
                     <\/p>\n
                      \n
                    • \n
                        SetString()<\/ul>\n<\/li>\n<\/ul>\n
                         <\/p>\n
                          \n
                        • \n
                            GetString()<\/ul>\n<\/li>\n<\/ul>\n
                             <\/p>\n
                              \n
                            • \n
                                Del()<\/ul>\n<\/li>\n<\/ul>\n
                                 <\/p>\n
                                  \n
                                • \n
                                    Key()<\/ul>\n<\/li>\n<\/ul>\n
                                     <\/p>\n
                                      IsCached()<\/ul>\n
                                      – \u6ce8\u518c\u9b54\u6cd5\u7389()<\/h2>\n
                                      \u7f13\u5b58\u5ba2\u6237\u7aef\u7684\u5b9e\u73b0<\/h3>\n
                                      \u8fd9\u4e2a\u7f13\u5b58\u83b7\u53d6\u5668\u5ba2\u6237\u7aef\u9700\u8981\u5b9e\u73b0\u7f13\u5b58\u5ba2\u6237\u7aef\uff0c\u4f46\u662f\u6211\u4eec\u63d0\u4f9b\u4e86\u4e00\u4e2a\u7b80\u5355\u7684Redis\u5ba2\u6237\u7aef\uff0c\u8fd9\u6837\u4f60\u53ef\u4ee5\u4f7f\u7528\u8fd9\u4e2a\u5ba2\u6237\u7aef\u6765\u8fd0\u884c\uff0c\u800c\u4e0d\u9700\u8981\u81ea\u5df1\u5b9e\u73b0\u3002<\/p>\n
                                      \/\/ SimpleRedisClientImpl \u306f\u30b5\u30f3\u30d7\u30eb\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e\u5b9f\u88c5\u3067\u3059\u3002<\/span>\r\ntype<\/span> SimpleRedisClientImpl<\/span> struct<\/span> {<\/span>\r\n    Rdb<\/span> *<\/span>redis<\/span>.<\/span>Client<\/span>\r\n}<\/span>\r\n\r\n\/\/ \u30b5\u30f3\u30d7\u30eb\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e `Set` \u5b9f\u88c5\u3067\u3059\u3002<\/span>\r\nfunc<\/span> (<\/span>i<\/span> *<\/span>SimpleRedisClientImpl<\/span>)<\/span> Set<\/span>(<\/span>key<\/span> string<\/span>,<\/span> value<\/span> interface<\/span>{},<\/span> expiration<\/span> time<\/span>.<\/span>Duration<\/span>)<\/span> error<\/span> {<\/span>\r\n    \/\/ You need an implementation to set from the cache.<\/span>\r\n    return<\/span> i<\/span>.<\/span>Rdb<\/span>.<\/span>Set<\/span>(<\/span>ctx<\/span>,<\/span> key<\/span>,<\/span> value<\/span>,<\/span> expiration<\/span>)<\/span>.<\/span>Err<\/span>()<\/span>\r\n}<\/span>\r\n\r\n\/\/ \u30b5\u30f3\u30d7\u30eb\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e `Get` \u5b9f\u88c5\u3067\u3059\u3002<\/span>\r\nfunc<\/span> (<\/span>i<\/span> *<\/span>SimpleRedisClientImpl<\/span>)<\/span> Get<\/span>(<\/span>key<\/span> string<\/span>,<\/span> dst<\/span> interface<\/span>{})<\/span> error<\/span> {<\/span>\r\n    \/\/ You need an implementation to get from the cache.<\/span>\r\n    v<\/span>,<\/span> err<\/span> :=<\/span> i<\/span>.<\/span>Rdb<\/span>.<\/span>Get<\/span>(<\/span>ctx<\/span>,<\/span> key<\/span>)<\/span>.<\/span>Result<\/span>()<\/span>\r\n    if<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n        return<\/span> err<\/span>\r\n    }<\/span>\r\n\r\n    reflect<\/span>.<\/span>ValueOf<\/span>(<\/span>dst<\/span>)<\/span>.<\/span>Elem<\/span>()<\/span>.<\/span>SetString<\/span>(<\/span>v<\/span>)<\/span>\r\n    return<\/span> nil<\/span>\r\n}<\/span>\r\n\r\n\/\/ \u30b5\u30f3\u30d7\u30eb\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e `Del` \u5b9f\u88c5\u3067\u3059\u3002<\/span>\r\nfunc<\/span> (<\/span>i<\/span> *<\/span>SimpleRedisClientImpl<\/span>)<\/span> Del<\/span>(<\/span>key<\/span> string<\/span>)<\/span> error<\/span> {<\/span>\r\n    return<\/span> i<\/span>.<\/span>Rdb<\/span>.<\/span>Del<\/span>(<\/span>ctx<\/span>,<\/span> key<\/span>)<\/span>.<\/span>Err<\/span>()<\/span>\r\n}<\/span>\r\n\r\n\/\/ \u30b5\u30f3\u30d7\u30eb\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e `IsErrCacheMiss` \u5b9f\u88c5\u3067\u3059\u3002<\/span>\r\n\/\/ \u30ad\u30e3\u30c3\u30b7\u30e5\u30df\u30b9\u30a8\u30e9\u30fc\u306e\u5224\u5b9a\u3092\u8fd4\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/span>\r\nfunc<\/span> (<\/span>i<\/span> *<\/span>SimpleRedisClientImpl<\/span>)<\/span> IsErrCacheMiss<\/span>(<\/span>err<\/span> error<\/span>)<\/span> bool<\/span> {<\/span>\r\n    return<\/span> errors<\/span>.<\/span>Is<\/span>(<\/span>err<\/span>,<\/span> redis<\/span>.<\/span>Nil<\/span>)<\/span>\r\n}<\/span>\r\n\r\n<\/code><\/pre>\n
                                      \u8bf7\u63d0\u4f9b\u4ee5\u4e0b\u7684\u4e2d\u6587\u672c\u5730\u5316\u7684\u5907\u9009\u9879\uff1a\u9009\u9879<\/h3>\n
                                      \u8fd9\u4e2aFetcher Client\u53ef\u4ee5\u4f7f\u7528\u8bbe\u7f6e\u4e2d\u7684Single Flight\u3002<\/p>\n
                                      \u5982\u679c\u542f\u7528 DebugPrintMode\uff0c\u952e\u5c06\u4f1a\u5728\u7ec8\u7aef\u4e0a\u8f93\u51fa\u3002<\/p>\n
                                      cachefetcher<\/span>.<\/span>Options<\/span>{<\/span>\r\n    Group<\/span>:<\/span>          &<\/span>singleflight<\/span>.<\/span>Group<\/span>{},<\/span> \/\/ default<\/span>\r\n    GroupTimeout<\/span>:<\/span>   30<\/span> *<\/span> time<\/span>.<\/span>Second<\/span>,<\/span>      \/\/ default<\/span>\r\n    DebugPrintMode<\/span>:<\/span> true<\/span>,<\/span>                  \/\/ default is false<\/span>\r\n})<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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