From 842a953bc4af50a318b25a5efb6637efa5a3af74 Mon Sep 17 00:00:00 2001
From: taynpg <taynpg@163.com>
Date: Thu, 9 Apr 2026 17:17:18 +0800
Subject: [PATCH] =?UTF-8?q?=E5=9F=BA=E6=9C=AC?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .gitignore  |   1 +
 Cargo.lock  | 377 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |  10 ++
 src/main.rs |  82 ++++++++++++
 4 files changed, 470 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..f40f9fc
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,377 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..cc9302a
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "rust_log"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+tracing = "0.1.44"
+tracing-subscriber = { version = "0.3.23", features = ["fmt", "ansi", "env-filter", "local-time"] }
+tracing-appender = "0.2.4"
+time = { version = "0.3", features = ["macros"] }
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..0eda2ab
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,82 @@
+use time::macros::format_description;
+use tracing::level_filters::LevelFilter;
+use tracing::{debug, error, info, trace, warn};
+use tracing_appender::rolling::{RollingFileAppender, Rotation};
+use tracing_subscriber::fmt::format;
+use tracing_subscriber::fmt::time::LocalTime;
+use tracing_subscriber::{self, fmt, layer::SubscriberExt, util::SubscriberInitExt};
+/*
+
+核心概念：Span 与 Event
+Tracing 的核心设计是围绕链路追踪展开的，通过两个核心概念 Span 和 Event 实现上下文关联与关键信息记录。
+
+Span（跨度）：描述一个操作的时间范围和上下文，是链路追踪的基本单元。每个 Span 可以包含多个子 Span，形成层级化的调用链路，用于清晰展示操作的链路过程。
+Event（事件）：记录 Span 生命周期内的关键瞬间，类似于日志记录，可携带键值对形式的结构化数据，便于后续筛选、解析和调试。
+
+*/
+
+fn main() {
+    // 滚动输出到文件
+    let file_appender = RollingFileAppender::builder()
+        .rotation(Rotation::DAILY)
+        .filename_prefix("app")
+        .filename_suffix("log")
+        .build("logs")
+        .expect("无法创建文件appender");
+
+    // 必须保持 _guard 的周期，才能 non_block 写入文件，不能 _ 接收。
+    let (non_block_writer, _guard) = tracing_appender::non_blocking(file_appender);
+
+    // 时间格式。
+    let timer_format =
+        format_description!("[year]-[month]-[day] [hour]:[minute]:[second].[subsecond digits:3]");
+    let timer = LocalTime::new(timer_format);
+
+    // Tracing 依赖订阅者（Subscriber）处理 Span 和 Event，需在程序入口初始化订阅者
+    tracing_subscriber::registry()
+        // 可以从环境读取：let env_filter =
+        // EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new("info"));
+        // 从环境变量 RUST_LOG(默认) 读取日志级别，默认设为 info
+        // 如果想从其他环境变量中读取，使用 try_from_env 这个函数
+        .with(LevelFilter::INFO)
+        // fmt::layer() 终端输出。
+        // .with(fmt::layer().with_timer(LocalTime::rfc_3339()))
+        .with(
+            fmt::layer()
+                .pretty()
+                .fmt_fields(format::PrettyFields::new())
+                .with_line_number(false)
+                .with_file(false)
+                .with_ansi(true)
+                .with_timer(timer.clone()),
+        )
+        .with(
+            fmt::layer()
+                .with_timer(timer.clone())
+                .with_ansi(false)
+                .with_writer(non_block_writer),
+        )
+        .init();
+
+    // span 演示。就是比正常日志多了，这个 mydemo 显示。
+    // 支持嵌套，可用于追踪调用。
+    // let test_span = span!(Level::INFO, "mydemo");
+    // let _enter = test_span.enter();
+
+    // span 可以用在函数上，自动创建， #[instrument(level = "INFO", skip(arg1))]
+    // 在异步场景下，不要直接采用手动创建 Span 的方式，这会导致上下文丢失。
+    // 有两种方式：
+    //      第一种就使用 #[instrument] 宏自动添加 Span。
+    //      另一种就是使用 tracing::Instrument 来手动创建 Span。
+    // tokio::spawn(async move {
+    //    async_fn3()
+    //        .instrument(tracing::info_span!("async_fn3"))
+    //        .await;
+    // });
+
+    trace!("你好，trace。");
+    debug!("你好，debug。");
+    info!("你好，info。");
+    warn!("你好，warn。");
+    error!("你好，error。");
+}