rustic_logger/
lib.rs

1use std::{fs::OpenOptions, io::{self, Write}};
2
3use chrono::{DateTime, Local};
4
5pub enum TSeverity {
6    DEBUG,
7    INFO,
8    WARN,
9    ERROR,
10}
11
12pub fn log(filename: &'static str, entry: &'static str, severity: Option<TSeverity>, time_format: Option<&'static str>) -> io::Result<String> {
13    let entry_time = formatted_time_entry(time_format);
14    
15    let entry_severity = match severity {
16        Some(TSeverity::DEBUG) => "DEBUG ",
17        Some(TSeverity::INFO) => "INFO  ",
18        Some(TSeverity::WARN) => "WARN  ",
19        Some(TSeverity::ERROR) => "ERROR ",
20        None => "",
21    };
22    
23    {
24        let together = format!("{}{} {}\n", entry_severity, entry_time, entry);
25        let entry_bytes = together.as_bytes();
26        record_entry_in_log(filename, &entry_bytes)?;
27    }
28    
29    Ok(entry_time)
30}
31
32fn formatted_time_entry(time_format: Option<&'static str>) -> String {
33    let default_time_format = "%Y-%m-%d %H:%M:%S,%3f";
34    let time_format_to_use = time_format.unwrap_or(default_time_format);
35    
36    let local: DateTime<Local> = Local::now();
37    let formatted = format!("[{}]", local.format(time_format_to_use).to_string());
38    formatted
39}
40
41fn record_entry_in_log(filename: &str, bytes: &[u8]) -> io::Result<()> {
42    let mut file = OpenOptions::new().
43                        append(true).
44                        write(true).
45                        create(true).
46                        open(filename)?;
47    file.write_all(bytes)?;
48    Ok(())
49}
rustic_logger/lib.rs

rustic_logger/
lib.rs
