rust 使用 logging 模块示例代码

rust 使用 log, env_logger 模块代码示例

1. 

[代码][其他]代码    

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
1#[macro_use]

2extern crate log;

3extern crate env_logger;

4

5extern crate time;

6

7use std::env;

8use log::{LogRecord, LogLevelFilter};

9use env_logger::LogBuilder;

10

11fn now() -> String {

12        time::strftime("%Y-%m-%d %H:%M:%S", &time::now()).unwrap()

13}

14

15

16fn main() {

17    let format = |record: &LogRecord| {

18        format!("{} {} {}:{} {}", now(), record.level(), record.location().file(), record.location().line(), record.args())

19    };

20

21    let mut builder = LogBuilder::new();

22    builder.format(format).filter(None, LogLevelFilter::Info);

23

24    if env::var("RUST_LOG").is_ok() {

25        builder.parse(&env::var("RUST_LOG").unwrap());

26    }

27

28    builder.init().unwrap();

29

30    error!("error message");

31    warn!("warn message");

32    info!("info message");

33    debug!("debug message");

34    trace!("trace message");

35    

36    info!("done.")

37}

38

39// output :

40//2016-06-25 16:49:04 ERROR examples/ex01.rs:41 error message

41//2016-06-25 16:49:04 WARN examples/ex01.rs:42 warn message

42//2016-06-25 16:49:04 INFO examples/ex01.rs:43 info message

43//2016-06-25 16:49:04 INFO examples/ex01.rs:47 done.

44