{"id":45627,"date":"2023-10-04T02:50:28","date_gmt":"2023-05-10T01:52:50","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45627-2\/"},"modified":"2024-05-04T02:43:15","modified_gmt":"2024-05-03T18:43:15","slug":"45627-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45627-2\/","title":{"rendered":""},"content":{"rendered":"<p>Rust\u3067\u4f7f\u3048\u308b\u30ed\u30ac\u30fc\u3092\u8abf\u3079\u3066\u307f\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3044\u304f\u3064\u304b\u3042\u308b\u5b9f\u88c5\u306e\u3046\u3061\u3001<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">env_logger<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">simple_logger<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">stderrlog<\/ul>\n<p>\u3092\u52d5\u304b\u3057\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n<h2>log crate<\/h2>\n<p>Rust\u306elog crate\u306binfo!\u7b49\u306e\u30de\u30af\u30ed\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u307e\u3059\u304c\u3001\u7528\u9014\u306b\u5fdc\u3058\u3066\u305d\u306e\u5b9f\u88c5\u3092\u9078\u3079\u308b\u4f5c\u308a\u306b\u306a\u3063\u3066\u3044\u308b\u3088\u3046\u3067\u3059\u3002<\/p>\n<h3>log\u5b9f\u88c5\u306e\u4e00\u89a7<\/h3>\n<p>Available loggin implementations\u306e\u8ee2\u8f09\u3067\u3059\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Simple minimal loggers:<\/ul>\n<\/li>\n<\/ul>\n<p>env_logger<br \/>\nsimple_logger<br \/>\nsimplelog<br \/>\npretty_env_logger<br \/>\nstderrlog<br \/>\nflexi_logger<\/p>\n<p>Complex configurable frameworks:<\/p>\n<p>log4rs<br \/>\nfern<\/p>\n<p>Adaptors for other facilities:<\/p>\n<p>syslog<br \/>\nslog-stdlog_<\/p>\n<h2>env_logger<\/h2>\n<p>log\u306e\u5b9f\u88c5\u3067\u3069\u308c\u3092\u4f7f\u3048\u3070\u3044\u3044\u306e\u304b\u5206\u304b\u308a\u307e\u305b\u3093\u304c\u3001crates.io\u306b\u3088\u308b\u3068env_logger\u306e\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u6570\u304c\u5727\u5012\u7684\u306b\u591a\u3044\u3088\u3046\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nd\">#[macro_use]<\/span>\r\n<span class=\"k\">extern<\/span> <span class=\"n\">crate<\/span> <span class=\"k\">log<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">extern<\/span> <span class=\"n\">crate<\/span> <span class=\"n\">env_logger<\/span> <span class=\"k\">as<\/span> <span class=\"n\">logger<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"k\">use<\/span> <span class=\"k\">log<\/span><span class=\"p\">::<\/span><span class=\"n\">Level<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">use<\/span> <span class=\"nn\">std<\/span><span class=\"p\">::<\/span><span class=\"n\">env<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"k\">fn<\/span> <span class=\"nf\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nn\">env<\/span><span class=\"p\">::<\/span><span class=\"nf\">set_var<\/span><span class=\"p\">(<\/span><span class=\"s\">\"RUST_LOG\"<\/span><span class=\"p\">,<\/span> <span class=\"s\">\"info\"<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"c\">\/\/ env::set_var(\"RUST_LOG\", \"trace\");<\/span>\r\n    <span class=\"nn\">logger<\/span><span class=\"p\">::<\/span><span class=\"nf\">init<\/span><span class=\"p\">();<\/span>\r\n\r\n    <span class=\"nd\">debug!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"this is a debug {}\"<\/span><span class=\"p\">,<\/span> <span class=\"s\">\"message\"<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"nd\">error!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"this is printed by default\"<\/span><span class=\"p\">);<\/span>\r\n\r\n    <span class=\"k\">if<\/span> <span class=\"nd\">log_enabled!<\/span><span class=\"p\">(<\/span><span class=\"nn\">Level<\/span><span class=\"p\">::<\/span><span class=\"n\">Info<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">let<\/span> <span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">3<\/span> <span class=\"o\">*<\/span> <span class=\"mi\">4<\/span><span class=\"p\">;<\/span> <span class=\"c\">\/\/ expensive computation<\/span>\r\n        <span class=\"nd\">info!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"the answer was: {}\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">x<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5b9f\u884c\u30d5\u30a1\u30a4\u30eb\u306e\u540d\u524d\u304cmain\u3068\u3059\u308b\u3068\u3001\u6b21\u306e\u3088\u3046\u306a\u5b9f\u884c\u7d50\u679c\u304c\u5f97\u3089\u308c\u307e\u3059\u3002env_logger\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u30ed\u30b0\u30ec\u30d9\u30eb\u306fError\u3067\u3001\u6a19\u6e96\u30a8\u30e9\u30fc\u51fa\u529b\u306b\u66f8\u304d\u51fa\u3055\u308c\u307e\u3059\u3002\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u306e\u4e2d\u3067\u74b0\u5883\u5909\u6570\u306eRUST_LOG\u3092Info\u306b\u8a2d\u5b9a\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u3053\u3053\u3067\u306ferror\u3068info\u306f\u51fa\u529b\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001debug\u306f\u4f55\u3082\u51fa\u307e\u305b\u3093\u306d\u3002<\/p>\n<pre class=\"post-pre\"><code>$ .\/main\r\n[2019-03-24T14:16:11Z ERROR log_sample] this is printed by default\r\n[2019-03-24T14:16:11Z INFO  log_sample] the answer was: 12\r\n<\/code><\/pre>\n<h2>simple_logger<\/h2>\n<p>crate\u306e\u540d\u524d\u306e\u901a\u308a\u3001\u30b7\u30f3\u30d7\u30eb\u306b\u6a19\u6e96\u51fa\u529b\u306b\u66f8\u304d\u51fa\u3057\u307e\u3059<\/p>\n<pre class=\"post-pre\"><code><span class=\"nd\">#[macro_use]<\/span>\r\n<span class=\"k\">extern<\/span> <span class=\"n\">crate<\/span> <span class=\"k\">log<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">extern<\/span> <span class=\"n\">crate<\/span> <span class=\"n\">simple_logger<\/span> <span class=\"k\">as<\/span> <span class=\"n\">logger<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"k\">use<\/span> <span class=\"k\">log<\/span><span class=\"p\">::<\/span><span class=\"n\">Level<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"k\">fn<\/span> <span class=\"nf\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"c\">\/\/ logger::init().unwrap();<\/span>\r\n    <span class=\"nn\">logger<\/span><span class=\"p\">::<\/span><span class=\"nf\">init_with_level<\/span><span class=\"p\">(<\/span><span class=\"nn\">Level<\/span><span class=\"p\">::<\/span><span class=\"n\">Info<\/span><span class=\"p\">)<\/span><span class=\"nf\">.unwrap<\/span><span class=\"p\">();<\/span>\r\n\r\n    <span class=\"nd\">debug!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"this is a debug {}\"<\/span><span class=\"p\">,<\/span> <span class=\"s\">\"message\"<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"nd\">error!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"this is printed by default\"<\/span><span class=\"p\">);<\/span>\r\n\r\n    <span class=\"k\">if<\/span> <span class=\"nd\">log_enabled!<\/span><span class=\"p\">(<\/span><span class=\"nn\">Level<\/span><span class=\"p\">::<\/span><span class=\"n\">Info<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">let<\/span> <span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">3<\/span> <span class=\"o\">*<\/span> <span class=\"mi\">4<\/span><span class=\"p\">;<\/span> <span class=\"c\">\/\/ expensive computation<\/span>\r\n        <span class=\"nd\">info!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"the answer was: {}\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">x<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5b9f\u884c\u30d5\u30a1\u30a4\u30eb\u306e\u540d\u524d\u304cmain\u3068\u3059\u308b\u3068\u3001\u6b21\u306e\u3088\u3046\u306a\u5b9f\u884c\u7d50\u679c\u304c\u5f97\u3089\u308c\u307e\u3059\u3002simple_logger\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u30ed\u30b0\u30ec\u30d9\u30eb\u306ftrace\u3067\u3059\u304c\u3001\u305d\u306e\u30ec\u30d9\u30eb\u306f\u7c21\u5358\u306b\u5909\u66f4\u3067\u304d\u308b\u307f\u305f\u3044\u3067\u3059\u3002\u591a\u304f\u306elogger\u306e\u5b9f\u88c5\u3067\u306f\u3053\u306e\u3088\u3046\u306ainit\u95a2\u6570\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u308b\u3068\u306e\u3053\u3068\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>$ .\/main\r\n2019-03-24 23:32:48 ERROR [log_sample] this is printed by default\r\n2019-03-24 23:32:48 INFO  [log_sample] the answer was: 12\r\n<\/code><\/pre>\n<h2>stderrlog<\/h2>\n<p>\u3082\u3046\u4e00\u3064\u304f\u3089\u3044\u3001stderrlog\u8a66\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nd\">#[macro_use]<\/span>\r\n<span class=\"k\">extern<\/span> <span class=\"n\">crate<\/span> <span class=\"k\">log<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">extern<\/span> <span class=\"n\">crate<\/span> <span class=\"n\">stderrlog<\/span> <span class=\"k\">as<\/span> <span class=\"n\">logger<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"k\">use<\/span> <span class=\"k\">log<\/span><span class=\"p\">::<\/span><span class=\"n\">Level<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"k\">fn<\/span> <span class=\"nf\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nn\">logger<\/span><span class=\"p\">::<\/span><span class=\"nf\">new<\/span><span class=\"p\">()<\/span>\r\n        <span class=\"nf\">.module<\/span><span class=\"p\">(<\/span><span class=\"nd\">module_path!<\/span><span class=\"p\">())<\/span>\r\n        <span class=\"nf\">.verbosity<\/span><span class=\"p\">(<\/span><span class=\"mi\">2<\/span><span class=\"p\">)<\/span>\r\n        <span class=\"nf\">.init<\/span><span class=\"p\">()<\/span>\r\n        <span class=\"nf\">.unwrap<\/span><span class=\"p\">();<\/span>\r\n\r\n    <span class=\"nd\">debug!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"this is a debug {}\"<\/span><span class=\"p\">,<\/span> <span class=\"s\">\"message\"<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"nd\">error!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"this is printed by default\"<\/span><span class=\"p\">);<\/span>\r\n\r\n    <span class=\"k\">if<\/span> <span class=\"nd\">log_enabled!<\/span><span class=\"p\">(<\/span><span class=\"nn\">Level<\/span><span class=\"p\">::<\/span><span class=\"n\">Info<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">let<\/span> <span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">3<\/span> <span class=\"o\">*<\/span> <span class=\"mi\">4<\/span><span class=\"p\">;<\/span> <span class=\"c\">\/\/ expensive computation<\/span>\r\n        <span class=\"nd\">info!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"the answer was: {}\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">x<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u3092\u5165\u308c\u305f\u308a\u3082\u3063\u3068\u7d30\u304b\u3044\u8a2d\u5b9a\u3082\u3067\u304d\u307e\u3059\u304c\u3001\u3053\u3053\u3067\u306f\u30b5\u30dc\u3063\u3066\u3044\u307e\u3059\u3002\u5b9f\u884c\u7d50\u679c\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>$ .\/main\r\nERROR - this is printed by default\r\nINFO - the answer was: 12\r\n<\/code><\/pre>\n<p>\u6ce8\u610f\u70b9\u3068\u3057\u3066\u306f\u3001stderrlog\u306everbosity\u304c\u30ed\u30b0\u30ec\u30d9\u30eb\u306b\u76f8\u5f53\u3059\u308b\u306e\u3067\u3059\u304c\u3001logcrate\u306eLovel\u3068\u306f\u5fae\u5999\u306b\u305a\u308c\u3066\u3044\u308b\u306e\u3067verbosity(Level::Info as usize)\u7b49\u3068\u3059\u308b\u3068\u671f\u5f85\u3059\u308b\u7d50\u679c\u3068\u305a\u308c\u3066\u3057\u307e\u3044\u307e\u3057\u305f\u3002\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u3068\u3044\u305f\u307b\u3046\u304c\u826f\u3055\u305d\u3046\u3067\u3059\u306d\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">log\u306eLevel<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">stderrlog\u306everbosity<\/ul>\n<h2>\u88dc\u8db3(?)<\/h2>\n<p>use &#8230; as logger\u3068\u3059\u308c\u3070\u30c0\u30c3\u30af\u30bf\u30a4\u30d4\u30f3\u30b0\u306b\u306a\u308b\u304b\u306a\u3068\u671f\u5f85\u3057\u305f\u306e\u3067\u3059\u304c\u3001\u5b9f\u88c5\u3054\u3068\u306b\u521d\u671f\u5316\u306b\u5fc5\u8981\u306a\u624b\u9806\u304c\u7570\u306a\u3063\u3066\u308b\u306e\u3067\u307b\u3068\u3093\u3069\u610f\u5473\u304c\u3042\u308a\u307e\u305b\u3093\u3067\u3057\u305forz<\/p>\n<h2>\u53c2\u8003\u306b\u3057\u305f\u8a18\u4e8b\u306a\u3069<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Crate log<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Rust\u3067\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u30c7\u30d0\u30c3\u30b0\u3092\u3059\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">Rust\uff1alog\u3067\u30ed\u30b0\u51fa\u529b\u3092\u884c\u3046<\/ul>\n<h2>\u30b3\u30fc\u30c9<\/h2>\n<p>log_sample<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Rust\u3067\u4f7f\u3048\u308b\u30ed\u30ac\u30fc\u3092\u8abf\u3079\u3066\u307f\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3044\u304f\u3064\u304b\u3042\u308b\u5b9f\u88c5\u306e\u3046\u3061\u3001 env_logger &nbsp; [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45627","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>- Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/45627-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"Rust\u3067\u4f7f\u3048\u308b\u30ed\u30ac\u30fc\u3092\u8abf\u3079\u3066\u307f\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3044\u304f\u3064\u304b\u3042\u308b\u5b9f\u88c5\u306e\u3046\u3061\u3001 env_logger &nbsp; [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/45627-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2023-05-10T01:52:50+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-05-03T18:43:15+00:00\" \/>\n<meta name=\"author\" content=\"\u5b87, \u534e\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta 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