{"id":45450,"date":"2022-11-17T13:16:32","date_gmt":"2023-05-08T11:07:27","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45450-2\/"},"modified":"2024-04-29T01:09:10","modified_gmt":"2024-04-28T17:09:10","slug":"45450-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45450-2\/","title":{"rendered":""},"content":{"rendered":"

\u3069\u306e\u304f\u3089\u3044\u9045\u3044\u304b<\/h2>\n

\u30d5\u30a9\u30eb\u30c0\u5185\u306e\u30d5\u30a1\u30a4\u30eb\u540d\u3092Vec\u306b\u307e\u3068\u3081\u3066\u304a\u304d\u305f\u3044\u5834\u9762\u304c\u3042\u308a\u307e\u3057\u305f\u3002Rust \u3067\u666e\u901a\u306b\u5b9f\u88c5\u3059\u308b\u3068\u4e0b\u8a18\u306e\u3088\u3046\u306b\u306a\u308b\u3067\u3057\u3087\u3046\u304b\u3002\u30d5\u30a1\u30a4\u30eb\u6570\u304c\u5c11\u306a\u3044\u3068\u304d\u306f\u554f\u984c\u306a\u3044\u3067\u3059\u304c\u3001\u79c1\u306e\u74b0\u5883\u3067\u306f1\u4e07\u30d5\u30a1\u30a4\u30eb\u7a0b\u5ea6\u3042\u308b\u5834\u5408\u306b 5~10sec \u3082\u639b\u304b\u3063\u3066\u3057\u307e\u3044\u307e\u3057\u305f\u3002
\n\u4e0b\u8a18\u306f\u30c0\u30e1\u306a\u4f8b\u3067\u3059\u3002\uff08\u30b3\u30e1\u30f3\u30c8\u3067\u6559\u3048\u3066\u9802\u304d\u307e\u3057\u305f\uff09<\/p>\n

use<\/span> std<\/span>::<\/span>fs<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>io<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>path<\/span>::<\/span>Path<\/span>;<\/span>\r\n\r\nfn<\/span> read_dir<\/span><<\/span>P<\/span>:<\/span> AsRef<\/span><<\/span>Path<\/span>>><\/span>(<\/span>path<\/span>:<\/span> P<\/span>)<\/span> -><\/span> io<\/span>::<\/span>Result<\/span><<\/span>Vec<\/span><<\/span>String<\/span>>><\/span> {<\/span>\r\n    Ok<\/span>(<\/span>fs<\/span>::<\/span>read_dir<\/span>(<\/span>path<\/span>)<\/span>?<\/span>\r\n        .filter_map<\/span>(|<\/span>entry<\/span>|<\/span> entry<\/span>.ok<\/span>())<\/span>\r\n        .map<\/span>(|<\/span>entry<\/span>|<\/span> entry<\/span>.path<\/span>())<\/span>\r\n        .filter<\/span>(|<\/span>path<\/span>|<\/span> path<\/span>.is_file<\/span>())<\/span>\r\n        .filter_map<\/span>(|<\/span>path<\/span>|<\/span> Some<\/span>(<\/span>path<\/span>.file_name<\/span>()<\/span>?<\/span>.to_str<\/span>()<\/span>?<\/span>.into<\/span>()))<\/span>\r\n        .collect<\/span>())<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u308c\u2193\u304c\u826f\u3044\u30b3\u30fc\u30c9<\/p>\n
fn<\/span> read_dir<\/span><<\/span>P<\/span>:<\/span> AsRef<\/span><<\/span>Path<\/span>>><\/span>(<\/span>path<\/span>:<\/span> P<\/span>)<\/span> -><\/span> io<\/span>::<\/span>Result<\/span><<\/span>Vec<\/span><<\/span>String<\/span>>><\/span> {<\/span>\r\n    Ok<\/span>(<\/span>fs<\/span>::<\/span>read_dir<\/span>(<\/span>path<\/span>)<\/span>?<\/span>\r\n        .filter_map<\/span>(|<\/span>entry<\/span>|<\/span> {<\/span>\r\n            let<\/span> entry<\/span> =<\/span> entry<\/span>.ok<\/span>()<\/span>?<\/span>;<\/span>\r\n            if<\/span> entry<\/span>.file_type<\/span>()<\/span>.ok<\/span>()<\/span>?<\/span>.is_file<\/span>()<\/span> {<\/span>\r\n                Some<\/span>(<\/span>entry<\/span>.file_name<\/span>()<\/span>.to_string_lossy<\/span>()<\/span>.into_owned<\/span>())<\/span>\r\n            }<\/span> else<\/span> {<\/span>\r\n                None<\/span>\r\n            }<\/span>\r\n        })<\/span>\r\n        .collect<\/span>())<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u540c\u3058\u3088\u3046\u306a\u51e6\u7406\u3092 Node \u3067\u5b9f\u884c\u3059\u308b\u3068 100msec \u53f0\u3067\u7d42\u4e86\u3057\u307e\u3059\u3002
\nJavaScript (Node) \u3067\u306f\u2193\u306e\u3088\u3046\u306b\u306a\u308b\u3002<\/p>\n
const<\/span> fs<\/span> =<\/span> require<\/span>(<\/span>\"<\/span>fs<\/span>\"<\/span>);<\/span>\r\n\r\nfunction<\/span> readdir<\/span>(<\/span>path<\/span>)<\/span> {<\/span>\r\n    return<\/span> fs<\/span>.<\/span>readdirSync<\/span>(<\/span>path<\/span>,<\/span> {<\/span> withFileTypes<\/span>:<\/span> true<\/span> })<\/span>\r\n        .<\/span>filter<\/span>(<\/span>e<\/span> =><\/span> e<\/span>.<\/span>isFile<\/span>())<\/span>\r\n        .<\/span>map<\/span>(<\/span>e<\/span> =><\/span> e<\/span>.<\/span>name<\/span>);<\/span>\r\n}<\/span>\r\n\r\n<\/code><\/pre>\n
\u306a\u305c\u9045\u3044\uff1f<\/h2>\n
\u30bd\u30fc\u30b9\u3092\u8997\u3044\u3066\u307f\u307e\u3057\u3087\u3046\u3002
\nRust: https:\/\/github.com\/rust-lang\/rust\/blob\/stable\/src\/libstd\/sys\/windows\/fs.rs#L91
\nNode: https:\/\/github.com\/nodejs\/node\/blob\/v12.x\/deps\/uv\/src\/win\/fs.c#L1588<\/p>\n
Windows \u306e\u5834\u5408\u3001\u3069\u3061\u3089\u3082FindFirstFileW\u3001FindNextFileW\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002
\nRust \u306fReadDir\u306e\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u9032\u3081\u308b\u305f\u3073\u306bWIN32_FIND_DATA\u306e\u30e1\u30e2\u30ea\u9818\u57df\u3092\u78ba\u4fdd\u3057\u3066FindNextFileW\u3092\u547c\u3073\u51fa\u3057\u3066\u3044\u307e\u3059\u3002\u4e00\u65b9\u3067 Node \u306ffs__readdir\u95a2\u6570\u306e\u5b9f\u884c\u6642\u306b Array \u306b\u3059\u3079\u3066\u306e\u30d5\u30a1\u30a4\u30eb\u60c5\u5831\u3092\u683c\u7d0d\u3057\u3066\u3044\u308b\u3088\u3046\u3067\u3059\u3002
\n\u306a\u305c Rust \u306f\u3053\u306e\u3088\u3046\u306a\u5b9f\u88c5\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u3067\u3057\u3087\u3046\u304b\uff1f\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u3092\u610f\u8b58\u3057\u3066\u308b\u306e\u304b\u306a\uff1f<\/p>\n
\u9045\u3044\u539f\u56e0\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3002\u79c1\u306e\u30b3\u30fc\u30c9\u304c\u60aa\u304b\u3063\u305f\u306e\u3067\u3057\u305f\u3002\u3061\u3083\u3093\u3061\u3083\u3093\u3002<\/p>\n
fs::read_dir\u3067\u305b\u3063\u304b\u304f\u5f97\u3089\u308c\u305f\u60c5\u5831\u3092\u6368\u3066\u3066\u3001Path::is_file\u3068Path::file_name\u3092\u547c\u3073\u51fa\u3057\u3066\u3044\u307e\u3059\u3002Path::is_file\u306f\u30d5\u30a1\u30a4\u30eb\u30d1\u30b9\u3092\u4f7f\u3063\u3066OS\u306b\u554f\u3044\u5408\u308f\u305b\u3066\u3044\u307e\u3059\u3057\u3001DirEntry::path\uff0bPath::file_name\u306f\u30d5\u30eb\u30d1\u30b9\u3092\u751f\u6210\u3057\u3066\u304b\u3089\u30d5\u30a1\u30a4\u30eb\u540d\u3060\u3051\u3092\u5207\u308a\u51fa\u3059\u3068\u3044\u3046\u51e6\u7406\u3092\u3057\u3066\u3044\u307e\u3059\u3002<\/p><\/blockquote>\n
API \u3092\u547c\u3073\u51fa\u3059\u5b9f\u88c5<\/h2>\n
Windows<\/h3>\n
\u3044\u3064\u3082\u306e\u3088\u3046\u306bwinapi\u3092\u4f7f\u3063\u3066\u66f8\u3044\u3066\u3044\u304d\u307e\u3059\u3002\u30a8\u30e9\u30fc\u51e6\u7406\u306fanyhow\u306b\u4e38\u6295\u3052\u3067\u3059\u3002<\/p>\n
use<\/span> anyhow<\/span>::{<\/span>anyhow<\/span>,<\/span> bail<\/span>,<\/span> Result<\/span>};<\/span>\r\nuse<\/span> std<\/span>::<\/span>char<\/span>::{<\/span>decode_utf16<\/span>,<\/span> REPLACEMENT_CHARACTER<\/span>};<\/span>\r\nuse<\/span> std<\/span>::<\/span>mem<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>path<\/span>::<\/span>Path<\/span>;<\/span>\r\nuse<\/span> winapi<\/span>::<\/span>um<\/span>::{<\/span>\r\n    fileapi<\/span>::{<\/span>FindClose<\/span>,<\/span> FindFirstFileW<\/span>,<\/span> FindNextFileW<\/span>},<\/span>\r\n    handleapi<\/span>::<\/span>INVALID_HANDLE_VALUE<\/span>,<\/span>\r\n    minwinbase<\/span>::<\/span>WIN32_FIND_DATAW<\/span>,<\/span>\r\n    winnt<\/span>::<\/span>FILE_ATTRIBUTE_DIRECTORY<\/span>,<\/span>\r\n};<\/span>\r\n\r\n#[cfg(target_os<\/span> =<\/span> \"windows\"<\/span>)]<\/span>\r\nfn<\/span> read_dir<\/span><<\/span>P<\/span>:<\/span> AsRef<\/span><<\/span>Path<\/span>>><\/span>(<\/span>path<\/span>:<\/span> P<\/span>)<\/span> -><\/span> Result<\/span><<\/span>Vec<\/span><<\/span>String<\/span>>><\/span> {<\/span>\r\n    if<\/span> path<\/span>.as_ref<\/span>()<\/span>.is_file<\/span>()<\/span> {<\/span>\r\n        bail!<\/span>(<\/span>\"Path is not directory\"<\/span>);<\/span>\r\n    }<\/span>\r\n    let<\/span> path<\/span> =<\/span> path<\/span>.as_ref<\/span>()<\/span>.join<\/span>(<\/span>\"*\"<\/span>);<\/span>\r\n    let<\/span> path<\/span> =<\/span> path<\/span>.to_str<\/span>()<\/span>.ok_or<\/span>(<\/span>anyhow!<\/span>(<\/span>\"No path str\"<\/span>))<\/span>?<\/span>;<\/span>\r\n\r\n    let<\/span> mut<\/span> fd<\/span> =<\/span> unsafe<\/span> {<\/span> mem<\/span>::<\/span>MaybeUninit<\/span>::<\/span><<\/span>WIN32_FIND_DATAW<\/span>><\/span>::<\/span>zeroed<\/span>()<\/span>.assume_init<\/span>()<\/span> };<\/span>\r\n    let<\/span> handle<\/span> =<\/span> unsafe<\/span> {<\/span> FindFirstFileW<\/span>(<\/span>encode<\/span>(<\/span>&<\/span>path<\/span>)<\/span>.as_ptr<\/span>(),<\/span> &<\/span>mut<\/span> fd<\/span>)<\/span> };<\/span>\r\n    if<\/span> handle<\/span> ==<\/span> INVALID_HANDLE_VALUE<\/span> {<\/span>\r\n        bail!<\/span>(<\/span>\"Invalid handle value\"<\/span>);<\/span>\r\n    }<\/span>\r\n    let<\/span> mut<\/span> v<\/span> =<\/span> vec!<\/span>[];<\/span>\r\n    while<\/span> unsafe<\/span> {<\/span> FindNextFileW<\/span>(<\/span>handle<\/span>,<\/span> &<\/span>mut<\/span> fd<\/span>)<\/span> }<\/span> !=<\/span> 0<\/span> {<\/span>\r\n        if<\/span> fd<\/span>.dwFileAttributes<\/span> &<\/span> FILE_ATTRIBUTE_DIRECTORY<\/span> ==<\/span> 0<\/span> {<\/span>\r\n            let<\/span> file_name<\/span> =<\/span> decode<\/span>(<\/span>&<\/span>fd<\/span>.cFileName<\/span>);<\/span>\r\n            v<\/span>.push<\/span>(<\/span>file_name<\/span>);<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n    unsafe<\/span> {<\/span> FindClose<\/span>(<\/span>handle<\/span>)<\/span> };<\/span>\r\n    Ok<\/span>(<\/span>v<\/span>)<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> encode<\/span>(<\/span>source<\/span>:<\/span> &<\/span>str<\/span>)<\/span> -><\/span> Vec<\/span><<\/span>u16<\/span>><\/span> {<\/span>\r\n    source<\/span>.encode_utf16<\/span>()<\/span>.chain<\/span>(<\/span>Some<\/span>(<\/span>0<\/span>))<\/span>.collect<\/span>()<\/span>\r\n}<\/span>\r\nfn<\/span> decode<\/span>(<\/span>source<\/span>:<\/span> &<\/span>[<\/span>u16<\/span>])<\/span> -><\/span> String<\/span> {<\/span>\r\n    let<\/span> mut<\/span> s<\/span> =<\/span> String<\/span>::<\/span>with_capacity<\/span>(<\/span>260<\/span>);<\/span>\r\n    for<\/span> c<\/span> in<\/span> decode_utf16<\/span>(<\/span>source<\/span>.iter<\/span>()<\/span>.take_while<\/span>(|<\/span>&<\/span>c<\/span>|<\/span> c<\/span> !=<\/span> &<\/span>0<\/span>)<\/span>.cloned<\/span>())<\/span> {<\/span>\r\n        let<\/span> c<\/span> =<\/span> c<\/span>.unwrap_or<\/span>(<\/span>REPLACEMENT_CHARACTER<\/span>);<\/span>\r\n        s<\/span>.push<\/span>(<\/span>c<\/span>);<\/span>\r\n    }<\/span>\r\n    s<\/span>.shrink_to_fit<\/span>();<\/span>\r\n    s<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
Linux<\/h3>\n
use<\/span> anyhow<\/span>::{<\/span>anyhow<\/span>,<\/span> bail<\/span>,<\/span> Result<\/span>};<\/span>\r\nuse<\/span> libc<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>ffi<\/span>::<\/span>CString<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>path<\/span>::<\/span>Path<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>slice<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>str<\/span>;<\/span>\r\n\r\n#[cfg(target_os<\/span> =<\/span> \"linux\"<\/span>)]<\/span>\r\nfn<\/span> read_dir<\/span><<\/span>P<\/span>:<\/span> AsRef<\/span><<\/span>Path<\/span>>><\/span>(<\/span>path<\/span>:<\/span> P<\/span>)<\/span> -><\/span> Result<\/span><<\/span>Vec<\/span><<\/span>String<\/span>>><\/span> {<\/span>\r\n    let<\/span> path<\/span> =<\/span> path<\/span>.as_ref<\/span>()<\/span>.to_str<\/span>()<\/span>.ok_or<\/span>(<\/span>anyhow!<\/span>(<\/span>\"No path str\"<\/span>))<\/span>?<\/span>;<\/span>\r\n    let<\/span> path<\/span> =<\/span> CString<\/span>::<\/span>new<\/span>(<\/span>path<\/span>)<\/span>?<\/span>;<\/span>\r\n    let<\/span> dir<\/span> =<\/span> unsafe<\/span> {<\/span> libc<\/span>::<\/span>opendir<\/span>(<\/span>path<\/span>.as_ptr<\/span>())<\/span> };<\/span>\r\n    if<\/span> dir<\/span>.is_null<\/span>()<\/span> {<\/span>\r\n        bail!<\/span>(<\/span>\"Dir in null\"<\/span>);<\/span>\r\n    }<\/span>\r\n    let<\/span> mut<\/span> v<\/span> =<\/span> vec!<\/span>[];<\/span>\r\n    loop<\/span> {<\/span>\r\n        let<\/span> entry<\/span> =<\/span> unsafe<\/span> {<\/span> libc<\/span>::<\/span>readdir<\/span>(<\/span>dir<\/span>)<\/span> };<\/span>\r\n        if<\/span> entry<\/span>.is_null<\/span>()<\/span> {<\/span>\r\n            break<\/span>;<\/span>\r\n        }<\/span>\r\n        let<\/span> file_name<\/span> =<\/span> unsafe<\/span> {<\/span>\r\n            let<\/span> name<\/span> =<\/span> (<\/span>*<\/span>entry<\/span>)<\/span>.d_name<\/span>.as_ptr<\/span>();<\/span>\r\n            let<\/span> len<\/span> =<\/span> libc<\/span>::<\/span>strlen<\/span>(<\/span>name<\/span>)<\/span> as<\/span> usize<\/span>;<\/span>\r\n            let<\/span> slice<\/span> =<\/span> slice<\/span>::<\/span>from_raw_parts<\/span>(<\/span>name<\/span> as<\/span> *<\/span>const<\/span> u8<\/span>,<\/span> len<\/span>);<\/span>\r\n            str<\/span>::<\/span>from_utf8_unchecked<\/span>(<\/span>slice<\/span> as<\/span> &<\/span>[<\/span>u8<\/span>])<\/span>.into<\/span>()<\/span>\r\n        };<\/span>\r\n        v<\/span>.push<\/span>(<\/span>file_name<\/span>);<\/span>\r\n    }<\/span>\r\n    unsafe<\/span> {<\/span> libc<\/span>::<\/span>closedir<\/span>(<\/span>dir<\/span>)<\/span> };<\/span>\r\n    Ok<\/span>(<\/span>v<\/span>)<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u30d9\u30f3\u30c1\u30de\u30fc\u30af<\/h2>\n
\u5358\u4f4d\u306f msec \u3067\u3059\u3002<\/p>\n
Windows<\/h3>\n
\n
Rust\uff08\u30c0\u30e1\uff09Rust\uff08\u826f\u3044\uff09Rust\uff08API\uff09JavaScript860533941<\/div>\n<\/div>\n
Linux<\/h3>\n
\n
Rust\uff08\u30c0\u30e1\uff09Rust\uff08\u826f\u3044\uff09Rust\uff08API\uff09JavaScript82211433<\/div>\n<\/div>\n
\u3084\u3063\u305f\u305c<\/p>\n","protected":false},"excerpt":{"rendered":"
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