rust - log4rs 错误 Log4rs(Os { 代码 : 2, 种类 : NotFound, 消息: "No such file or directory"})

Question

我正在尝试通过遵循 the docs 来实现 log4rs .我的目标是将 info!("INFO") 的结果放入文件 requests.log，但出现错误:

thread 'main' panicked at 'called Result::unwrap() on an Err value: Log4rs(Os { code: 2, kind: NotFound, message: "No such file or directory" })', libcore/result.rs:945:5

我在 src 文件夹中有以下文件:

- main.rs
- log4rs.yml
- requests.log

主要.rs:

#[macro_use]
extern crate log;
extern crate log4rs;

fn main() {
    println!("Hello, world!");
    log4rs::init_file("log4rs.yml", Default::default()).unwrap();
    info!("INFO");
}

配置文件log4rs.yml:

# Scan this file for changes every 30 seconds
refresh_rate: 30 seconds

appenders:
  # An appender named "stdout" that writes to stdout
  stdout:
    kind: console

  # An appender named "requests" that writes to a file with a custom pattern encoder
  requests:
    kind: file
    path: "requests.log"
    encoder:
      pattern: "{d} - {m}{n}"

# Set the default logging level to "warn" and attach the "stdout" appender to the root
root:
  level: warn
  appenders:
    - stdout

loggers:
  # Raise the maximum log level for events sent to the "app::backend::db" logger to "info"
  app::backend::db:
    level: info

  # Route log events sent to the "app::requests" logger to the "requests" appender,
  # and *not* the normal appenders installed at the root
  app::requests:
    level: info
    appenders:
      - requests
    additive: false

Answer 1

当您键入 cargo run 时，您的工作目录就是当前目录。这意味着您的所有相对路径都将取决于此工作目录。

例如，如果您在您的主目录 (~) 中并且您的项目文件夹名为 foo。当你进入它时，它会给你 ~/foo。如果您现在键入 cargo run，这意味着当 log4rs 尝试打开您的文件时，它将尝试打开文件 ~/foo/log4rs.yml。该文件不在这里，而是在 ~/foo/src/log4rs.yml

你有很多解决方案:

• log4rs::init_file("src/log4rs.yml", Default::default()).unwrap();
• 将 log4rs.yml 移动到 foo
• 使用绝对路径(对于您当前的情况不是一个好的解决方案)