{"id":44068,"date":"2022-10-01T06:03:15","date_gmt":"2023-11-02T05:59:35","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8%e5%ad%a6%e4%b9%a0%e3%80%8ago%e8%af%ad%e8%a8%80%e4%b9%8b%e6%97%85%ef%bc%88%e7%bb%83%e4%b9%a0%ef%bc%9a%e7%bd%91%e7%bb%9c%e7%88%ac%e8%99%ab%ef%bc%89%e3%80%8b%e6%97%b6%e5%8f%aa%e9%80%9a%e8%bf%87\/"},"modified":"2024-01-15T11:53:14","modified_gmt":"2024-01-15T03:53:14","slug":"%e5%9c%a8%e5%ad%a6%e4%b9%a0%e3%80%8ago%e8%af%ad%e8%a8%80%e4%b9%8b%e6%97%85%ef%bc%88%e7%bb%83%e4%b9%a0%ef%bc%9a%e7%bd%91%e7%bb%9c%e7%88%ac%e8%99%ab%ef%bc%89%e3%80%8b%e6%97%b6%e5%8f%aa%e9%80%9a%e8%bf%87","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8%e5%ad%a6%e4%b9%a0%e3%80%8ago%e8%af%ad%e8%a8%80%e4%b9%8b%e6%97%85%ef%bc%88%e7%bb%83%e4%b9%a0%ef%bc%9a%e7%bd%91%e7%bb%9c%e7%88%ac%e8%99%ab%ef%bc%89%e3%80%8b%e6%97%b6%e5%8f%aa%e9%80%9a%e8%bf%87\/","title":{"rendered":"\u5728\u5b66\u4e60\u300aGo\u8bed\u8a00\u4e4b\u65c5\uff08\u7ec3\u4e60\uff1a\u7f51\u7edc\u722c\u866b\uff09\u300b\u65f6\u53ea\u901a\u8fc7\u5b8c\u6210\u8bfe\u7a0b\u8fdb\u884c\u56de\u7b54"},"content":{"rendered":"

\u8fbe\u5230\u7684\u76ee\u7684\u53ea\u6709\u4e00\u4e2a\u3002<\/h1>\n

(Note: The given phrase “\u76ee\u7684” means “purpose” or “objective” in English. The provided paraphrase in Chinese conveys the same meaning.)<\/p>\n

\u300aGo\u4e4b\u65c5\u300b\u662f\u4e00\u6761\u6240\u6709\u521a\u5f00\u59cb\u5b66\u4e60Go\u8bed\u8a00\u7684\u4eba\u90fd\u4f1a\u7ecf\u5386\u7684\u8def\u7ebf\uff0c\u4f46\u662f\u7ec3\u4e60\u9898\u8fd8\u662f\u633a\u8d39\u8111\u529b\u7684\u3002
\n\u5373\u4f7f\u65e0\u6cd5\u89e3\u51b3\uff0c\u56e0\u4e3a\u7f51\u7edc\u4e0a\u6709\u5f88\u591a\u7b54\u6848\uff0c\u6211\u4eec\u53ef\u4ee5\u7406\u89e3\u5e76\u7ee7\u7eed\u524d\u8fdb\u3002
\n\u4e0d\u8fc7\uff0c\u53ea\u6709\u6700\u540e\u4e00\u4e2a\u95ee\u9898\uff0c\u65e0\u8bba\u600e\u4e48\u627e\uff0c\u90fd\u627e\u4e0d\u5230\u53ea\u4f7f\u7528\u5728\u6559\u7a0b\u4e2d\u5b66\u5230\u7684\u77e5\u8bc6\u5c31\u80fd\u89e3\u7b54\u7684\u3002
\n\u8fd9\u53ef\u80fd\u53ea\u662f\u6211\u627e\u4e0d\u5bf9\u65b9\u6cd5\u5427\u3002\u3002\u3002
\n\u8fd9\u6b21\uff0c\u6211\u53ea\u4f7f\u7528\u4e86\u5728\u6559\u7a0b\u4e2d\u5b66\u5230\u7684\u77e5\u8bc6\u6765\u89e3\u7b54\uff08\u53ef\u80fd\u4e0d\u592a\u806a\u660e\uff09\uff0c\u4f46\u8fd8\u662f\u7559\u5b58\u4e0b\u6765\u3002<\/p>\n

\u8acb\u63d0\u4f9b\u554f\u984c\u7684\u5167\u5bb9\u3002<\/h1>\n

Golang\u4e4b\u65c5 | \u7ec3\u4e60\uff1a\u7f51\u7edc\u722c\u866b<\/p>\n

\u8bf7\u4fee\u6539Crawl\u51fd\u6570,\u4f7f\u5176\u80fd\u591f\u540c\u65f6\u83b7\u53d6\u591a\u4e2aURL\uff0c\u800c\u4e0d\u9700\u83b7\u53d6\u76f8\u540c\u7684URL\u4e24\u6b21\u3002<\/p>\n

\u8865\u5145\u8bf4\u660e\uff1a\u60a8\u53ef\u4ee5\u5728Crawl\u51fd\u6570\u5185\u90e8\u8fdb\u884c\u9002\u5f53\u6539\u8fdb\u6765\u5b9e\u73b0\uff0c\u4f46\u4e0d\u5fc5\u975e\u8981\u5c06\u5176\u90fd\u653e\u5728Crawl\u51fd\u6570\u5185\u90e8\u3002<\/p>\n

\u7b80\u800c\u8a00\u4e4b\uff1amap\u53ef\u4ee5\u7528\u6765\u7f13\u5b58\u5df2\u83b7\u53d6\u7684URL\uff0c\u4f46\u4ec5\u9760map\u65e0\u6cd5\u786e\u4fdd\u5e76\u53d1\u6267\u884c\u7684\u5b89\u5168\u6027\uff01<\/p><\/blockquote>\n

\u722c\u866b\u7f51\u9875\u4ee3\u7801\u7684\u95ee\u9898exercise-web-crawler.go
\npackage main<\/p>\n

import (
\n“fmt”
\n)<\/p>\n

type Fetcher interface {
\n\/\/ Fetch\u8fd4\u56deURL\u7684\u5185\u5bb9\u548c\u627e\u5230\u7684URL\u5217\u8868\u3002
\nFetch(url string) (body string, urls []string, err error)
\n}<\/p>\n

\/\/ Crawl\u4f7f\u7528fetcher\u9012\u5f52\u722c\u53d6\u9875\u9762\uff0c\u4ece\u7ed9\u5b9a\u7684url\u5f00\u59cb\uff0c\u722c\u53d6\u5230\u6307\u5b9a\u7684\u6df1\u5ea6\u3002
\nfunc Crawl(url string, depth int, fetcher Fetcher) {
\n\/\/ TODO: \u5e76\u884c\u83b7\u53d6URL\u3002
\n\/\/ TODO: \u4e0d\u91cd\u590d\u83b7\u53d6\u76f8\u540c\u7684URL\u3002
\n\/\/ \u8fd9\u4e2a\u5b9e\u73b0\u90fd\u6ca1\u6709\u505a\u5230\uff1a
\nif depth <= 0 {
\nreturn
\n}
\nbody, urls, err := fetcher.Fetch(url)
\nif err != nil {
\nfmt.Println(err)
\nreturn
\n}
\nfmt.Printf(“\u53d1\u73b0: %s %q\\n”, url, body)
\nfor _, u := range urls {
\nCrawl(u, depth-1, fetcher)
\n}
\nreturn
\n}<\/p>\n

func main() {
\nCrawl(“https:\/\/golang.org\/”, 4, fetcher)
\n}<\/p>\n

\/\/ fakeFetcher\u662f\u4e00\u4e2a\u8fd4\u56de\u56fa\u5b9a\u7ed3\u679c\u7684Fetcher\u3002
\ntype fakeFetcher map[string]*fakeResult<\/p>\n

type fakeResult struct {
\nbody string
\nurls []string
\n}<\/p>\n

func (f fakeFetcher) Fetch(url string) (string, []string, error) {
\nif res, ok := f[url]; ok {
\nreturn res.body, res.urls, nil
\n}
\nreturn “”, nil, fmt.Errorf(“\u672a\u627e\u5230: %s”, url)
\n}<\/p>\n

\/\/ fetcher\u662f\u4e00\u4e2a\u586b\u5145\u4e86\u5047\u6570\u636e\u7684fakeFetcher\u3002
\nvar fetcher = fakeFetcher{
\n“https:\/\/golang.org\/”: &fakeResult{
\n“Go\u7f16\u7a0b\u8bed\u8a00”,
\n[]string{
\n“https:\/\/golang.org\/pkg\/”,
\n“https:\/\/golang.org\/cmd\/”,
\n},
\n},
\n“https:\/\/golang.org\/pkg\/”: &fakeResult{
\n“Packages”,
\n[]string{
\n“https:\/\/golang.org\/”,
\n“https:\/\/golang.org\/cmd\/”,
\n“https:\/\/golang.org\/pkg\/fmt\/”,
\n“https:\/\/golang.org\/pkg\/os\/”,
\n},
\n},
\n“https:\/\/golang.org\/pkg\/fmt\/”: &fakeResult{
\n“fmt\u5305”,
\n[]string{
\n“https:\/\/golang.org\/”,
\n“https:\/\/golang.org\/pkg\/”,
\n},
\n},
\n“https:\/\/golang.org\/pkg\/os\/”: &fakeResult{
\n“os\u5305”,
\n[]string{
\n“https:\/\/golang.org\/”,
\n“https:\/\/golang.org\/pkg\/”,
\n},
\n},
\n}<\/p>\n<\/details>\n

\u8fd9\u6bb5\u4ee3\u7801\u5728\u505a\u4ec0\u4e48\uff1f<\/h2>\n

\u9996\u5148\uff0c\u5728mail()\u51fd\u6570\u4e2d\u8c03\u7528\u4e86Crawl(“https:\/\/golang.org\/”, 4, fetcher)\u3002
\n\u53e6\u5916\uff0c\u53ef\u4ee5\u770b\u51fa\u5bf9\u4e8e\u901a\u8fc7fetcher.Fetch(url)\u83b7\u53d6\u7684\u591a\u4e2aURL\uff0c\u4e5f\u8c03\u7528\u4e86Crawl(u, depth-1, fetcher)\u3002
\n\u67e5\u770bCrawl()\u51fd\u6570\uff0c\u53ef\u4ee5\u770b\u5230\u5728depth <= 0\u65f6\u8fd4\u56de\uff0c\u5e76\u4e14\u6bcf\u6b21\u8c03\u7528Crawl()\u51fd\u6570\u65f6\u90fd\u4f1a\u5bf9depth\u8fdb\u884c\u51cf1\u64cd\u4f5c\u3002
\n\u4e5f\u5c31\u662f\u8bf4\uff0c\u5bf9\u4e8e\u6bcf\u4e2aURL\u6700\u591a\u8c03\u7528\u4e863\u6b21Crawl()\u51fd\u6570\u3002<\/p>\n

\u7136\u540e\uff0c\u6211\u4eec\u6765\u5bf9\u7167\u4e00\u4e0bfetcher\u7684\u5f62\u72b6\u548c\u503c\u3002<\/p>\n

type<\/span> fakeFetcher<\/span> map<\/span>[<\/span>string<\/span>]<\/span>*<\/span>fakeResult<\/span>\r\n\r\ntype<\/span> fakeResult<\/span> struct<\/span> {<\/span>\r\n    body<\/span> string<\/span>\r\n    urls<\/span> []<\/span>string<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
var<\/span> fetcher<\/span> =<\/span> fakeFetcher<\/span>{<\/span>\r\n    \"https:\/\/golang.org\/\"<\/span>:<\/span> &<\/span>fakeResult<\/span>{<\/span>\r\n        \"The Go Programming Language\"<\/span>,<\/span>\r\n        []<\/span>string<\/span>{<\/span>\r\n            \"https:\/\/golang.org\/pkg\/\"<\/span>,<\/span>\r\n            \"https:\/\/golang.org\/cmd\/\"<\/span>,<\/span>\r\n        },<\/span>\r\n    },<\/span>\r\n<\/code><\/pre>\n
\u5f53\u770b\u5230\u7b2c\u4e00\u4e2a\u9009\u9879\u65f6\uff0c\u53ef\u4ee5\u770b\u51fafetcher\u7684\u5f62\u5f0f\u662fmap[key]{ body, urls[XXX, YYY] }\u3002<\/p>\n
\u5f53\u8c03\u7528 fetcher[“https:\/\/golang.org\/”].body \u65f6\uff0c\u5c06\u4f1a\u8fd4\u56de “The Go Programming Language”\u3002
\n\u5f53\u8c03\u7528 fetcher[“https:\/\/golang.org\/”].urls \u65f6\uff0c\u5c06\u4f1a\u8fd4\u56de [https:\/\/golang.org\/pkg\/ https:\/\/golang.org\/cmd\/]\u3002
\n\u901a\u8fc7\u4ee5\u4e0a\u7684\u4e86\u89e3\uff0c\u53ef\u4ee5\u5f97\u51fa\u7ed3\u8bba fetcher.Fetch(url) \u5b9e\u9645\u4e0a\u53ea\u662f\u8fd4\u56de\u4e86\u4e0a\u8ff0\u5185\u5bb9\u3002<\/p>\n
\u7136\u540e\uff0c\u5bf9\u4e8e\u6bcf\u4e2aURL\uff0c\u6700\u591a\u91cd\u590d3\u6b21\u76f8\u540c\u7684\u64cd\u4f5c\u6216\u8005\u5728map\u7684\u952e\uff08\u5373URL\uff09\u4e0d\u5b58\u5728\uff08\u5373\u672a\u627e\u5230\uff09\u4e4b\u524d\u4e00\u76f4\u91cd\u590d\u3002<\/p>\n
\u7b54\u6848\u4e4b\u8def<\/h1>\n
\u6839\u636e\u95ee\u9898\u7684\u5185\u5bb9\uff0c\u9700\u8981\u505a\u7684\u4e8b\u60c5\u5927\u81f4\u6709\u4e24\u4e2a\u65b9\u9762\u3002<\/p>\n
    \n
  1. \n
      \u5e76\u884c\u83b7\u53d6URL<\/ol>\n<\/li>\n<\/ol>\n
       <\/p>\n
        \u53ea\u8c03\u7528\u4e00\u6b21URL<\/ol>\n
        1. \u901a\u8fc7\u4f7f\u7528goroutine\uff0c\u53ef\u4ee5\u5b9e\u73b0\u6b64\u529f\u80fd\u3002\u53e6\u5916\uff0c\u4e3a\u4e86\u8fdb\u884c\u540c\u6b65\uff0c\u53ef\u4ee5\u4f7f\u7528chanel\u6765\u5b9e\u73b0\u3002
        \n2. \u5173\u4e8e\u7b2c\u4e8c\u70b9\uff0c\u6839\u636e\u6240\u5199\uff0c\u4f7f\u7528map\u5e94\u8be5\u53ef\u4ee5\u5b9e\u73b0\u3002\u7136\u800c\uff0c\u7531\u4e8e\u6d89\u53ca\u5e76\u884c\u6267\u884c\uff0c\u4f3c\u4e4e\u9700\u8981\u8fdb\u884c\u4e92\u65a5\u63a7\u5236\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e92\u65a5\u9501mutex(Lock(), Unlock())\u6765\u5b9e\u73b0\u3002<\/p>\n
        \u9996\u5148\uff0c\u6211\u4eec\u770b\u4e00\u4e0b\u5728main()\u51fd\u6570\u4e2d\u8c03\u7528\u7684Crawl()\u51fd\u6570\u3002<\/p>\n
        func<\/span> Crawl<\/span>(<\/span>url<\/span> string<\/span>,<\/span> depth<\/span> int<\/span>,<\/span> fetcher<\/span> Fetcher<\/span>)<\/span> {<\/span>\r\n    \/\/ TODO: Fetch URLs in parallel.<\/span>\r\n    \/\/ TODO: Don't fetch the same URL twice.<\/span>\r\n    \/\/ This implementation doesn't do either:<\/span>\r\n    if<\/span> depth<\/span> <=<\/span> 0<\/span> {<\/span>\r\n        return<\/span>\r\n    }<\/span>\r\n    body<\/span>,<\/span> urls<\/span>,<\/span> err<\/span> :=<\/span> fetcher<\/span>.<\/span>Fetch<\/span>(<\/span>url<\/span>)<\/span>\r\n    if<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n        fmt<\/span>.<\/span>Println<\/span>(<\/span>err<\/span>)<\/span>\r\n        return<\/span>\r\n    }<\/span>\r\n    fmt<\/span>.<\/span>Printf<\/span>(<\/span>\"found: %s %q<\/span>\\n<\/span>\"<\/span>,<\/span> url<\/span>,<\/span> body<\/span>)<\/span>\r\n    for<\/span> _<\/span>,<\/span> u<\/span> :=<\/span> range<\/span> urls<\/span> {<\/span>\r\n        Crawl<\/span>(<\/span>u<\/span>,<\/span> depth<\/span>-<\/span>1<\/span>,<\/span> fetcher<\/span>)<\/span>\r\n    }<\/span>\r\n    return<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
        \u867d\u7136\u5b83\u662f\u9012\u5f52\u8c03\u7528\uff0c\u4f46\u5982\u679c\u4f7f\u7528\u901a\u9053\uff0c\u4f3c\u4e4e\u53ea\u9700\u8981\u5728\u51fd\u6570\u5185\u90e8\u518d\u521b\u5efa\u4e00\u4e2a\u51fd\u6570\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n
        \u6211\u5c06\u539f\u6765\u7684\u5904\u7406\u903b\u8f91\u5b8c\u6574\u5730\u653e\u5165\u4e86crawlChild()\u4e2d\u3002<\/p>\n
        func<\/span> Crawl<\/span>(<\/span>url<\/span> string<\/span>,<\/span> depth<\/span> int<\/span>,<\/span> fetcher<\/span> Fetcher<\/span>)<\/span> {<\/span>\r\n    \/\/ TODO: Fetch URLs in parallel.<\/span>\r\n    \/\/ TODO: Don't fetch the same URL twice.<\/span>\r\n    \/\/ This implementation doesn't do either:<\/span>\r\n    var<\/span> crawlChild<\/span> func<\/span>(<\/span>string<\/span>,<\/span> int<\/span>)<\/span>\r\n    crawlChild<\/span> =<\/span> func<\/span>(<\/span>url<\/span> string<\/span>,<\/span> depth<\/span> int<\/span>)<\/span> {<\/span>\r\n        if<\/span> depth<\/span> <=<\/span> 0<\/span> {<\/span>\r\n            return<\/span>\r\n        }<\/span>\r\n        body<\/span>,<\/span> urls<\/span>,<\/span> err<\/span> :=<\/span> fetcher<\/span>.<\/span>Fetch<\/span>(<\/span>url<\/span>)<\/span>\r\n        if<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n            fmt<\/span>.<\/span>Println<\/span>(<\/span>err<\/span>)<\/span>\r\n            return<\/span>\r\n        }<\/span>\r\n        fmt<\/span>.<\/span>Printf<\/span>(<\/span>\"found: %s %q<\/span>\\n<\/span>\"<\/span>,<\/span> url<\/span>,<\/span> body<\/span>)<\/span>\r\n        for<\/span> _<\/span>,<\/span> u<\/span> :=<\/span> range<\/span> urls<\/span> {<\/span>\r\n            go<\/span> crawlChild<\/span>(<\/span>u<\/span>,<\/span> depth<\/span>-<\/span>1<\/span>)<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n    crawlChild<\/span>(<\/span>url<\/span>,<\/span> depth<\/span>)<\/span>\r\n    return<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
        \u5982\u679c\u4f7f\u7528\u8fd9\u6837\u8fd0\u884c\uff0c\u53ea\u4f1a\u8f93\u51fa\u4e00\u4e2a\u3002\u5b83\u4f1a\u5728\u4e0d\u7b49\u5f85\u5176\u4ed6goroutine\u7684\u60c5\u51b5\u4e0b\u7ed3\u675f\u3002<\/p>\n
        found: https:\/\/golang.org\/ \"The Go Programming Language\"\r\n<\/code><\/pre>\n
        \u5c1d\u8bd5\u4fee\u6539\u4ee5\u4f7f\u7528 Chanel\u3002<\/p>\n
        func<\/span> Crawl<\/span>(<\/span>url<\/span> string<\/span>,<\/span> depth<\/span> int<\/span>,<\/span> fetcher<\/span> Fetcher<\/span>)<\/span> {<\/span>\r\n    \/\/ TODO: Fetch URLs in parallel.<\/span>\r\n    \/\/ TODO: Don't fetch the same URL twice.<\/span>\r\n    \/\/ This implementation doesn't do either:<\/span>\r\n    \/\/ \u8ffd\u52a0<\/span>\r\n    ch<\/span> :=<\/span> make<\/span>(<\/span>chan<\/span> string<\/span>,<\/span> depth<\/span>*<\/span>depth<\/span>)<\/span>\r\n    var<\/span> prev<\/span> int<\/span>\r\n\r\n    var<\/span> crawlChild<\/span> func<\/span>(<\/span>string<\/span>,<\/span> int<\/span>)<\/span>\r\n    crawlChild<\/span> =<\/span> func<\/span>(<\/span>url<\/span> string<\/span>,<\/span> depth<\/span> int<\/span>)<\/span> {<\/span>\r\n        if<\/span> depth<\/span> <=<\/span> 0<\/span> {<\/span>\r\n            return<\/span>\r\n        }<\/span>\r\n        \/\/ \u8ffd\u52a0<\/span>\r\n        ch<\/span> <-<\/span> url<\/span>\r\n        body<\/span>,<\/span> urls<\/span>,<\/span> err<\/span> :=<\/span> fetcher<\/span>.<\/span>Fetch<\/span>(<\/span>url<\/span>)<\/span>\r\n        if<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n            fmt<\/span>.<\/span>Println<\/span>(<\/span>err<\/span>)<\/span>\r\n            return<\/span>\r\n        }<\/span>\r\n        fmt<\/span>.<\/span>Printf<\/span>(<\/span>\"found: %s %q<\/span>\\n<\/span>\"<\/span>,<\/span> url<\/span>,<\/span> body<\/span>)<\/span>\r\n        for<\/span> _<\/span>,<\/span> u<\/span> :=<\/span> range<\/span> urls<\/span> {<\/span>\r\n            go<\/span> crawlChild<\/span>(<\/span>u<\/span>,<\/span> depth<\/span>-<\/span>1<\/span>)<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n    crawlChild<\/span>(<\/span>url<\/span>,<\/span> depth<\/span>)<\/span>\r\n    \/\/ \u8ffd\u52a0<\/span>\r\n    for<\/span> {<\/span>\r\n        if<\/span> len<\/span>(<\/span>ch<\/span>)<\/span> !=<\/span> prev<\/span> {<\/span>\r\n            prev<\/span> =<\/span> len<\/span>(<\/span>ch<\/span>)<\/span>\r\n        }<\/span> else<\/span> {<\/span>\r\n            break<\/span>\r\n        }<\/span>\r\n        time<\/span>.<\/span>Sleep<\/span>(<\/span>time<\/span>.<\/span>Millisecond<\/span>)<\/span>\r\n    }<\/span>\r\n    return<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
        \u7531\u4e8e\u5982\u679c\u672a\u6307\u5b9a\u5927\u5c0f\u4f1a\u5bfc\u81f4\u6b7b\u9501\uff0c\u6240\u4ee5\u6211\u6307\u5b9a\u4e86\u5927\u5c0f\uff0c\u4f46\u662f\u6211\u4e0d\u77e5\u9053\u5408\u9002\u7684\u5927\u5c0f\uff0c\u6240\u4ee5\u6211\u8bd5\u4e86\u4e00\u4e0bdepth*depth\u4f5c\u4e3a\u5927\u5c0f\u3002\u7136\u540e\uff0c\u5728\u8fd4\u56de\u4e4b\u524d\uff0c\u867d\u7136\u4e0d\u662f\u6b63\u5e38\u7684\u7528\u6cd5\uff0c\u4f46\u6211\u4f1a\u7528\u65e0\u9650\u5faa\u73af\u7b49\u5f85\uff0c\u76f4\u5230\u786e\u5b9a\u901a\u9053\u6570\u91cf\u4e0d\u4f1a\u518d\u589e\u52a0\u3002<\/p>\n
        \u5f53\u4ee5\u8fd9\u4e2a\u72b6\u6001\u6267\u884c\u65f6\uff0c\u6700\u7ec8\u7ec8\u4e8e\u83b7\u5f97\u4e86\u4e0e\u6700\u521d\u76f8\u540c\u7684\u7ed3\u679c\u3002
        \n\u63a5\u4e0b\u6765\uff0c\u53ea\u9700\u8981\u786e\u4fddURL\u4ec5\u88ab\u8c03\u7528\u4e00\u6b21\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5URL\u4e3a\u952e\u7684map[string]bool\uff0c\u5728\u8c03\u7528URL\u4e4b\u524d\u8fdb\u884cT\/F\u5224\u65ad\u5373\u53ef\u3002<\/p>\n
        func<\/span> Crawl<\/span>(<\/span>url<\/span> string<\/span>,<\/span> depth<\/span> int<\/span>,<\/span> fetcher<\/span> Fetcher<\/span>)<\/span> {<\/span>\r\n    \/\/ TODO: Fetch URLs in parallel.<\/span>\r\n    \/\/ TODO: Don't fetch the same URL twice.<\/span>\r\n    \/\/ This implementation doesn't do either:<\/span>\r\n    \/\/ \u8ffd\u52a0<\/span>\r\n    ch<\/span> :=<\/span> make<\/span>(<\/span>chan<\/span> string<\/span>,<\/span> depth<\/span>*<\/span>depth<\/span>)<\/span>\r\n    var<\/span> prev<\/span> int<\/span>\r\n    \/\/ \u8ffd\u52a0<\/span>\r\n    cache<\/span> :=<\/span> make<\/span>(<\/span>map<\/span>[<\/span>string<\/span>]<\/span>bool<\/span>)<\/span>\r\n    var<\/span> mutex<\/span> sync<\/span>.<\/span>Mutex<\/span>\r\n\r\n    var<\/span> crawlChild<\/span> func<\/span>(<\/span>string<\/span>,<\/span> int<\/span>)<\/span>\r\n    crawlChild<\/span> =<\/span> func<\/span>(<\/span>url<\/span> string<\/span>,<\/span> depth<\/span> int<\/span>)<\/span> {<\/span>\r\n        if<\/span> depth<\/span> <=<\/span> 0<\/span> {<\/span>\r\n            return<\/span>\r\n        }<\/span>\r\n        \/\/ \u8ffd\u52a0<\/span>\r\n        if<\/span> cache<\/span>[<\/span>url<\/span>]<\/span> ==<\/span> true<\/span> {<\/span>\r\n            return<\/span>\r\n        }<\/span>\r\n        mutex<\/span>.<\/span>Lock<\/span>()<\/span>\r\n        defer<\/span> mutex<\/span>.<\/span>Unlock<\/span>()<\/span>\r\n        cache<\/span>[<\/span>url<\/span>]<\/span> =<\/span> true<\/span>\r\n\r\n        \/\/ \u8ffd\u52a0<\/span>\r\n        ch<\/span> <-<\/span> url<\/span>\r\n        body<\/span>,<\/span> urls<\/span>,<\/span> err<\/span> :=<\/span> fetcher<\/span>.<\/span>Fetch<\/span>(<\/span>url<\/span>)<\/span>\r\n        if<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n            fmt<\/span>.<\/span>Println<\/span>(<\/span>err<\/span>)<\/span>\r\n            return<\/span>\r\n        }<\/span>\r\n        fmt<\/span>.<\/span>Printf<\/span>(<\/span>\"found: %s %q<\/span>\\n<\/span>\"<\/span>,<\/span> url<\/span>,<\/span> body<\/span>)<\/span>\r\n        for<\/span> _<\/span>,<\/span> u<\/span> :=<\/span> range<\/span> urls<\/span> {<\/span>\r\n            go<\/span> crawlChild<\/span>(<\/span>u<\/span>,<\/span> depth<\/span>-<\/span>1<\/span>)<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n    crawlChild<\/span>(<\/span>url<\/span>,<\/span> depth<\/span>)<\/span>\r\n    \/\/ \u8ffd\u52a0<\/span>\r\n    for<\/span> {<\/span>\r\n        if<\/span> len<\/span>(<\/span>ch<\/span>)<\/span> !=<\/span> prev<\/span> {<\/span>\r\n            prev<\/span> =<\/span> len<\/span>(<\/span>ch<\/span>)<\/span>\r\n        }<\/span> else<\/span> {<\/span>\r\n            break<\/span>\r\n        }<\/span>\r\n        time<\/span>.<\/span>Sleep<\/span>(<\/span>time<\/span>.<\/span>Millisecond<\/span>)<\/span>\r\n    }<\/span>\r\n    return<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
        \u5f53\u5b83\u88ab\u6267\u884c\u65f6\uff0c\u5b8c\u7f8e\u5730\u53ea\u88ab\u8c03\u7528\u4e86\u4e00\u6b21\u3002<\/p>\n
        found: https:\/\/golang.org\/ \"The Go Programming Language\"\r\nfound: https:\/\/golang.org\/pkg\/ \"Packages\"\r\nfound: https:\/\/golang.org\/pkg\/os\/ \"Package os\"\r\nnot found: https:\/\/golang.org\/cmd\/\r\nfound: https:\/\/golang.org\/pkg\/fmt\/ \"Package fmt\"\r\n\r\nProgram exited.\r\n<\/code><\/pre>\n
        \u8fd9\u4e2a\u4ee3\u7801\u5728\u4e0b\u9762\u7684\u94fe\u63a5\u4e2d\u53ef\u4ee5\u627e\u5230\uff1a a-tour-of-go\/exercise-web-crawler.go at master \u00b7 hirano00o\/a-tour-of-go<\/p>\n
        \u6700\u540e<\/h1>\n
        \u53bb\u5b66\u5b8cA Tour of Go\u4e4b\u540e\uff0c\u6211\u8ba4\u4e3a\u6700\u597d\u53bb\u5b9e\u9645\u7f16\u5199\u4e00\u4e9b\u4e1c\u897f\uff0c\u6216\u8005\u67e5\u770bGo Wiki\uff08\u82f1\u8bed\uff09\u548cCodeReviewComments\u3002\u867d\u7136\u5b66\u4e60A Tour of Go\u53ef\u80fd\u9700\u8981\u82b1\u8d39\u4e00\u6bb5\u65f6\u95f4\uff0c\u4f46\u662f\u57fa\u672c\u7684\u6982\u5ff5\u4f1a\u5b66\u5230\uff0c\u6240\u4ee5\u6211\u8ba4\u4e3a\u5b83\u662f\u503c\u5f97\u4e00\u505a\u7684\u3002<\/p>\n
        \u5173\u4e8e CodeReviewComment\uff0c\u56e0\u4e3a\u6709\u4eba\u5df2\u7ecf\u7ffb\u8bd1\u4e86\uff0c\u6240\u4ee5\u6211\u60f3\u4f60\u53ef\u4ee5\u53bb\u770b\u770b\u90a3\u4e2a\u3002<\/p>\n
        \u53ef\u4ee5\u53c2\u7167<\/h2>\n
          \n
        • \n
            Home \u00b7 golang\/go Wiki<\/ul>\n<\/li>\n<\/ul>\n
             <\/p>\n
              #golang CodeReviewComments \u65e5\u672c\u8a9e\u7ffb\u8a33 – Qiita<\/ul>\n","protected":false},"excerpt":{"rendered":"
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