erldash 0.3.0

A simple, terminal-based Erlang dashboard
Documentation 
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

use anyhow::Context;
use clap::Parser;
use erldash::{metrics, ui};

/// Erlang Dashboard.
#[derive(Debug, Parser)]
#[clap(version)]
struct Args {
    #[clap(subcommand)]
    command: erldash::Command,

    #[clap(hide = true, long)]
    logfile: Option<std::path::PathBuf>,

    #[clap(hide = true,long, default_value_t = simplelog::LevelFilter::Info)]
    loglevel: simplelog::LevelFilter,

    #[clap(hide = true, long)]
    truncate_log: bool,
}

fn main() -> anyhow::Result<()> {
    let args = Args::parse();
    setup_logger(&args)?;

    let poller = metrics::MetricsPoller::start_thread(args.command)?;
    let app = ui::App::new(poller)?;
    app.run()?;
    Ok(())
}

fn setup_logger(args: &Args) -> anyhow::Result<()> {
    if let Some(logfile) = &args.logfile {
        let file = std::fs::OpenOptions::new()
            .append(!args.truncate_log)
            .truncate(args.truncate_log)
            .create(true)
            .write(true)
            .open(logfile)
            .with_context(|| format!("failed to open log file {:?}", logfile))?;
        simplelog::WriteLogger::init(args.loglevel, Default::default(), file)?;
    }
    Ok(())
}