{"id":728,"date":"2020-11-17T21:36:04","date_gmt":"2020-11-17T13:36:04","guid":{"rendered":"https:\/\/www.rayer.idv.tw\/blog\/?p=728"},"modified":"2020-11-19T16:24:19","modified_gmt":"2020-11-19T08:24:19","slug":"go-%e5%a6%82%e4%bd%95%e9%99%8d%e4%bd%8e%e9%9d%9e%e5%90%8c%e6%ad%a5%e8%99%95%e7%90%86%e7%9a%84%e5%bb%b6%e9%81%b2","status":"publish","type":"post","link":"https:\/\/www.rayer.idv.tw\/blog\/?p=728","title":{"rendered":"go \u5982\u4f55\u964d\u4f4e\u975e\u540c\u6b65\u8655\u7406\u7684\u5ef6\u9072"},"content":{"rendered":"\n

\u539f\u59cbslide\u5728\u9019\u88e1<\/a>\u3002\u539f\u6587\u7684\u7bc4\u4f8b\u7f3a\u4e86\u4e00\u4e9b\u6771\u897f\u4ee5\u81f4\u65bccompile\u8d77\u4f86\u6703\u932f\u8aa4\uff0c\u6211\u628a\u7f3a\u7684\u6771\u897f\u9806\u624b\u88dc\u4e0a\u53bb\uff0c\u4ee5\u53ca\u88dc\u4e0a\u4e00\u4e9b\u6211\u9019\u908a\u7684\u5fc3\u5f97\u8ddf\u984d\u5916\u7684\u6e2c\u8a66\u65b9\u6cd5\u3002<\/p>\n\n\n\n\n\n\n\n

\u7bc4\u4f8b : Google Search<\/h2>\n
    \n
  • Google Search\u662f\u5e79\u561b\u7684\n
      \n
    • \u7d66\u4e00\u500bquery string\uff0c\u56de\u50b3\u641c\u5c0b\u7d50\u679c\uff08\u4e5f\u8a31\u9084\u52a0\u4e9b\u5ee3\u544a\uff09<\/li>\n<\/ul>\n<\/li>\n
    • \u6211\u5011\u8981\u600e\u9ebc\u5f97\u5230\u641c\u5c0b\u7d50\u679c\n
        \n
      • \u5206\u5225\u9001query string\u5230Web\/Image\/Youtube\/Map\/News…\u7b49\u641c\u5c0b\u5f15\u64ce\uff0c\u7136\u5f8c\u628a\u7d50\u679c\u5408\u4f75\u8d77\u4f86<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

        \u6211\u5011\u8981\u600e\u9ebcimplement\u9019\u500b\u7cfb\u7d71?<\/p>\n

        \u5148\u4f86Mockup\u9019\u500b\u7cfb\u7d71\u7684\u6a23\u5b50\u5427<\/h2>\n

        \u6211\u5011\u7528fakeSearch<\/code>\u4f86\u6a21\u64ec\u4e00\u500bServer\uff0c\u9019\u500bserver\u53ef\u80fd\u6703\u5f88\u5feb\u5373\u6642\u7684\u53cd\u61c9\uff0c\u4e5f\u53ef\u80fd\u6700\u591a\u6703\u5728100ms\u4ee5\u5f8c\u624d\u53cd\u61c9\u3002<\/p>\n

        var (\n    Web = fakeSearch("web")\n    Image = fakeSearch("image")\n    Video = fakeSearch("video")\n)\n\ntype Search func(query string) Result\ntype Result string\n\n\/\/\u7b2c\u4e00\u500b\u7248\u672c\u7684google search, \u6700\u76f4\u89c0\nfunc Google(query string) (results []Result) {\n\tresults = append(results, Web(query))\n\tresults = append(results, Image(query))\n\tresults = append(results, Video(query))\n\treturn\n}\n\nfunc fakeSearch(kind string) Search {\n        return func(query string) Result {\n        \/\/\u6a21\u64ecServer\u5ef6\u9072\n              time.Sleep(time.Duration(rand.Intn(100)) * time.Millisecond)\n              return Result(fmt.Sprintf("%s result for %q\\n", kind, query))\n        }\n}\n<\/code><\/pre>\n
        \u6e2c\u8a66\u4e00\u4e0b\u9019\u500bmock\u80fd\u4e0d\u80fdwork<\/p>\n
        func main() {\n    rand.Seed(time.Now().UnixNano())\n    start := time.Now()\n    results := Google("golang")\n    elapsed := time.Since(start)\n    fmt.Println(results)\n    fmt.Println(elapsed)\n}\n<\/code><\/pre>\n
        Google Search 1.0<\/h2>\n
        1.0\u5c31\u662f\u6211\u5011\u653e\u5728mockup\u88e1\u9762\u7684\u90a3\u500b\u7248\u672c\uff0cgoogle\u6703\u53bb\u5404\u7a2e\u4f86\u6e90\u641c\u5c0b\u7d50\u679c\uff0c\u7136\u5f8c\u628a\u5b83\u7d66\u5408\u4f75\u8d77\u4f86\u50b3\u56de\u53bb\u3002<\/p>\n
        func Google(query string) (results []Result) {\n\tresults = append(results, Web(query))\n\tresults = append(results, Image(query))\n\tresults = append(results, Video(query))\n\treturn\n}\n<\/code><\/pre>\n
        Google Search 2.0<\/h2>\n
        1.0\u986f\u7136\u6709\u4e9b\u554f\u984c\uff0c\u4ed6\u7684query\u90fd\u662f\u8981\u7b49\u4e0a\u4e00\u500bquery\u5b8c\u6210\u4ee5\u5f8c\u624d\u80fd\u555f\u52d5\uff0c\u6240\u4ee5\u6574\u500b\u7a0b\u5e8f\u6703\u88ab\u963b\u585e\u597d\u4e00\u9663\u5b50\u3002\u9019\u500b\u5be6\u4f5c\u4e0d\u9700\u8981\u9396\uff0c\u6c92\u6709conditional variable\uff0c\u4e5f\u4e0d\u9700\u8981callbacks<\/p>\n
        func Google(query string) (results []Result) {\n    c := make(chan Result)\n    go func() { c <- Web(query) } ()\n    go func() { c <- Image(query) } ()\n    go func() { c <- Video(query) } ()\n\n    for i := 0; i < 3; i++ {\n        result := <-c\n        results = append(results, result)\n    }\n    return\n}\n<\/code><\/pre>\n
        Google Search 2.1<\/h2>\n
        \u90a3\u8981\u662f\u6211\u5011\u8a2d\u5b9a\u4e00\u500btimeout\u5462?<\/p>\n
            c := make(chan Result)\n    go func() { c <- Web(query) } ()\n    go func() { c <- Image(query) } ()\n    go func() { c <- Video(query) } ()\n\n    timeout := time.After(80 * time.Millisecond)\n    for i := 0; i < 3; i++ {\n        select {\n        case result := <-c:\n            results = append(results, result)\n        case <-timeout:\n            fmt.Println("timed out")\n            return\n        }\n    }\n    return\n\n<\/code><\/pre>\n
        \u4f46\u662f\u986f\u7136\u7684\uff0cdrop\u6389\u592a\u6162\u7684search\u5176\u5be6\u4e0d\u592a\u597d\u3002\u5047\u8a2dServer\u56de\u61c9\u6642\u9593\u5c31\u662f0-100\u4e4b\u9593\uff0c\u800c\u592a\u6162\u7684response\u5c31\u662f\u6703\u88abdrop\u6389\uff0c\u90a3\u6709\u6c92\u6709\u4ec0\u9ebc\u65b9\u6cd5\u80fd\u62ff\u5230\u5b8c\u6574\u7684result\u5462\uff1f<\/p>\n
        Google Search 3.0<\/h2>\n
        \u89e3\u6c7adrop\u904e\u6162result\u7684\u554f\u984c<\/h3>\n
        \u8981\u89e3\u6c7a2.1\u7684\u554f\u984c\u5176\u5be6\u4e5f\u4e0d\u96e3\uff0c\u6211\u5011\u5c0d\u540c\u4e00\u500b\u670d\u52d9\uff08\u6bd4\u65b9\u8aaaVideo<\/code>\uff09\u505a\u51fa\u591a\u500brequest\uff0c\u53d6\u5176\u4e2d\u6700\u5feb\u7684\u4e00\u500b\u5c31\u53ef\u4ee5\u4e86 — \u9019\u4e5f\u662fgoogle\u76ee\u524d\u7684\u505a\u6cd5\uff0c\u6240\u4ee5\u5927\u5bb6\u77e5\u9053\u70ba\u4ec0\u9ebc\u641c\u5c0b\u90a3\u9ebc\u8017\u96fb\u4e86\u5427….<\/p>\n
        func First(query string, replicas ...Search) Result {\n    c := make(chan Result)\n    searchReplica := func(i int) { c <- replicas[i](query) }\n    for i := range replicas {\n        go searchReplica(i)\n    }\n    return <-c\n}\n\nfunc main() {\n    rand.Seed(time.Now().UnixNano())\n    start := time.Now()\n    result := First("golang",\n        fakeSearch("replica 1"),\n        fakeSearch("replica 2"))\n    elapsed := time.Since(start)\n    fmt.Println(result)\n    fmt.Println(elapsed)\n}\n<\/code><\/pre>\n
        \u6240\u4ee53.0\u5be6\u4f5c\u5927\u6982\u6703\u9577\u9019\u6a23<\/h3>\n
        \u8a18\u5f97\u8981\u5148\u5728\u4e0a\u65b9\u984d\u5916\u5ba3\u544aWeb2\/Image2\/Video2<\/p>\n
        var (\n\tWeb = fakeSearch("web")\n\tImage = fakeSearch("image")\n\tVideo = fakeSearch("video")\n\tWeb2 = fakeSearch("web")\n\tImage2 = fakeSearch("image")\n\tVideo2 = fakeSearch("video")\n)\n<\/code><\/pre>\n
        \u7136\u5f8c3.0\u6703\u662f\u9577\u9019\u6a23<\/p>\n
            c := make(chan Result)\n    go func() { c <- First(query, Web, Web2) } ()\n    go func() { c <- First(query, Image, Image2) } ()\n    go func() { c <- First(query, Video, Video2) } ()\n    timeout := time.After(80 * time.Millisecond)\n    for i := 0; i < 3; i++ {\n        select {\n        case result := <-c:\n            results = append(results, result)\n        case <-timeout:\n            fmt.Println("timed out")\n            return\n        }\n    }\n    return\n<\/code><\/pre>\n
        3.0\u9084\u6709\u4ec0\u9ebc\u554f\u984c\u5462?<\/h3>\n
        \u9019\u500b\u7559\u4f5cBonus\u7d66\u5927\u5bb6\u53c3\u8003\u4e00\u4e0b\u30023.0\u6709\u4e00\u500b\u76f8\u7576\u660e\u986f\u7684bug\u5c31\u662f\uff0c\u7576First\u5f8c\u9762\u7684\u6240\u6709Search\u90fd\u5927\u65bc80\u7684\u6642\u5019\uff0c\u6703\u5c0e\u81f4\u6389\u7d50\u679c\u3002\u6bd4\u65b9\u8aaa\uff0cc <- First(query, Image, Image2)<\/code>\u7576\u5f8c\u9762\u5169\u500b\u56de\u61c9\u901f\u5ea6\u90fd\u6bd480\u6162\uff08\u8a2d\u5b9a\u4e0a\u4ed6\u5011\u901f\u5ea6\u662f0-100\uff09\uff0c\u8a72\u7d50\u679c\u5c31\u4e0d\u898b\u4e86\uff0c\u4f60\u6703\u770b\u5230\u5370\u51fatimed out\u3002<\/p>\n
        \u6240\u4ee5\u6211\u5011\u9084\u53ef\u4ee5\u7814\u7a76\u770b\u770b :<\/p>\n
          \n
        • \u5982\u4f55\u907f\u514d\u6389\u8cc7\u6599\uff1f<\/li>\n
        • \u5982\u4f55\u5728\u6389\u8cc7\u6599\u7684\u6642\u5019\u52d5\u614b\u628a\u5bb9\u5fcd\u503c\u62c9\u9ad8\uff1f\u597d\u8655\u8ddf\u58de\u8655\u5206\u5225\u662f\uff1f<\/li>\n
        • \u6216\u8005\u63db\u500b\u65b9\u6cd5\uff0c\u5982\u4f55\u52d5\u614b\u589e\u52a0replica\uff1f\u597d\u8655\u8ddf\u58de\u8655\u5206\u5225\u662f\uff1f\u5728\u73fe\u5be6\u751f\u6d3b\u4e2d\uff0c\u52d5\u614b\u589e\u52a0replica\u7684\u8a71\uff0c\u61c9\u8a72\u8981\u6ce8\u610f\u4ec0\u9ebc\u689d\u4ef6\uff1f<\/li>\n
        • \u4e8b\u5be6\u4e0a\u7db2\u8def\u9023\u7dda\u901f\u5ea6\u4e26\u975efakeSearch\u9019\u6a23\u7684\u7a69\u5b9a\u5728\u5169\u500b\u6578\u503c\u4e2d\u9593\u5f98\u5f8a\uff0c\u6709\u6c92\u6709\u66f4\u597d\u7684\u6a21\u578b\u53ef\u4ee5\u6a21\u64ec\u4e00\u6bb5\u597d\u4e00\u6bb5\u58de\u7684\u4e0d\u7a69\u5b9a\u7db2\u8def\uff1f\u751a\u81f3package drop?<\/li>\n<\/ul>\n
          \u5982\u679c\u8981\u6e2c\u8a66\u9019\u500b\u6975\u7aef\u72c0\u614b\u7684\u8a71\uff0c\u6211\u5011\u53ef\u4ee5\u628atimeout := time.After(80 *time.Millisecond)<\/code>\u768480\u6539\u6210\u4e00\u500b\u66f4\u5c0f\u7684\u6578\u5b57\uff0c\u6bd4\u65b9\u8aaa40\u3002\u6216\u8005\u8aaa\uff0c\u6211\u5011\u53ef\u4ee5\u628afakeSearch\u7684response time\u52d5\u614b\u62c9\u5230\u4e00\u500b\u66f4\u5927\u7684\u7bc4\u570d\uff0c\u5c31\u53ef\u4ee5\u5f88\u5bb9\u6613\u91cd\u73fe\u51fa\u9019\u500b\u6389\u8cc7\u6599\u7684\u72c0\u614b\u3002<\/p>\n
          \u4f86\u6bd4\u8f03\u4e00\u4e0b1.0 2.0 3.0\u7684\u6548\u80fd<\/h2>\n
          demo code\u5982\u4e0b\uff0c\u7d50\u679c\u5927\u7d04\u6703\u50cf\u662f\u9019\u6a23<\/p>\n
          Function : main.Google1 Total time : 1639       Avg time : 163\nFunction : main.Google2 Total time : 712        Avg time : 71\nFunction : main.Google3 Total time : 550        Avg time : 55<\/p>\n
          package main\n\nimport (\n\t"fmt"\n\t"math\/rand"\n\t"reflect"\n\t"runtime"\n\t"time"\n)\n\nvar (\n\tWeb = fakeSearch("web")\n\tImage = fakeSearch("image")\n\tVideo = fakeSearch("video")\n\tWeb2 = fakeSearch("web")\n\tImage2 = fakeSearch("image")\n\tVideo2 = fakeSearch("video")\n)\n\ntype Search func(query string) Result\ntype Google func(query string) []Result\ntype Result string\n\nfunc fakeSearch(kind string) Search {\n\treturn func(query string) Result {\n\t\ttime.Sleep(time.Duration(rand.Intn(100)) * time.Millisecond)\n\t\treturn Result(fmt.Sprintf("%s result for %q\\n", kind, query))\n\t}\n}\n\nfunc Google1(query string) (results []Result) {\n\tresults = append(results, Web(query))\n\tresults = append(results, Image(query))\n\tresults = append(results, Video(query))\n\treturn\n}\n\nfunc Google2(query string) (results []Result) {\n\tc := make(chan Result)\n\tgo func() { c <- Web(query) } ()\n\tgo func() { c <- Image(query) } ()\n\tgo func() { c <- Video(query) } ()\n\n\tfor i := 0; i < 3; i++ {\n\t\tresult := <-c\n\t\tresults = append(results, result)\n\t}\n\treturn\n}\n\nfunc Google21(query string) (results []Result) {\n\tc := make(chan Result)\n\tgo func() { c <- Web(query) } ()\n\tgo func() { c <- Image(query) } ()\n\tgo func() { c <- Video(query) } ()\n\n\ttimeout := time.After(80 * time.Millisecond)\n\tfor i := 0; i < 3; i++ {\n\t\tselect {\n\t\tcase result := <-c:\n\t\t\tresults = append(results, result)\n\t\tcase <-timeout:\n\t\t\tfmt.Println("timed out")\n\t\t\treturn\n\t\t}\n\t}\n\treturn\n}\n\nfunc First(query string, replicas ...Search) Result {\n\tc := make(chan Result)\n\tsearchReplica := func(i int) { c <- replicas[i](query) }\n\tfor i := range replicas {\n\t\tgo searchReplica(i)\n\t}\n\treturn <-c\n}\n\nfunc Google3(query string) (results []Result) {\n\tc := make(chan Result)\n\tgo func() { c <- First(query, Web, Web2) } ()\n\tgo func() { c <- First(query, Image, Image2) } ()\n\tgo func() { c <- First(query, Video, Video2) } ()\n\ttimeout := time.After(80 * time.Millisecond)\n\tfor i := 0; i < 3; i++ {\n\t\tselect {\n\t\tcase result := <-c:\n\t\t\tresults = append(results, result)\n\t\tcase <-timeout:\n\t\t\tfmt.Println("timed out")\n\t\t\treturn\n\t\t}\n\t}\n\treturn\n}\n\nfunc Benchmark(google Google) (output []Result, start time.Time, elapsed time.Duration) {\n\tstart = time.Now()\n\toutput = google("golang")\n\telapsed = time.Since(start)\n\treturn\n}\n\nfunc GetFunctionName(i interface{}) string {\n\treturn runtime.FuncForPC(reflect.ValueOf(i).Pointer()).Name()\n}\n\nfunc main() {\n\ttest := []Google{Google1, Google2, Google3}\n\tconst loops = 10\n\tfor _, google := range test {\n\t\tvar totalTime int64\n\t\tfor round := 0; round < loops; round++ {\n\t\t\trand.Seed(time.Now().UnixNano())\n\t\t\t\/\/fmt.Printf("start\\t : %d -> %s\\n", round, GetFunctionName(google))\n\t\t\t_, _, elapsed := Benchmark(google)\n\t\t\ttotalTime += elapsed.Milliseconds()\n\t\t\t\/\/fmt.Printf("end\\t : %d -> %s(%s)\\n", round, GetFunctionName(google), elapsed)\n\t\t}\n\t\tfmt.Printf("Function : %s\\tTotal time : %d\\tAvg time : %d\\n", GetFunctionName(google), totalTime, totalTime \/ 10)\n\t}\n}\n<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
          \u539f\u59cbslide\u5728\u9019\u88e1\u3002\u539f\u6587\u7684\u7bc4\u4f8b\u7f3a\u4e86\u4e00\u4e9b\u6771\u897f\u4ee5\u81f4\u65bccompile\u8d77\u4f86\u6703\u932f\u8aa4\uff0c\u6211\u628a\u7f3a\u7684\u6771\u897f\u9806\u624b\u88dc\u4e0a\u53bb\uff0c\u4ee5\u53ca\u88dc\u4e0a\u4e00\u4e9b\u6211\u9019\u908a\u7684\u5fc3\u5f97\u8ddf\u984d\u5916\u7684\u6e2c\u8a66\u65b9\u6cd5\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[38,84],"tags":[86],"class_list":["post-728","post","type-post","status-publish","format-standard","hentry","category-code","category-84","tag-golang"],"yoast_head":"\ngo \u5982\u4f55\u964d\u4f4e\u975e\u540c\u6b65\u8655\u7406\u7684\u5ef6\u9072 - 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