taler-rust

GNU Taler code in Rust. Largely core banking integrations.
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lib.rs (3027B)

      1 /*
      2   This file is part of TALER
      3   Copyright (C) 2024, 2025, 2026 Taler Systems SA
      4 
      5   TALER is free software; you can redistribute it and/or modify it under the
      6   terms of the GNU Affero General Public License as published by the Free Software
      7   Foundation; either version 3, or (at your option) any later version.
      8 
      9   TALER is distributed in the hope that it will be useful, but WITHOUT ANY
     10   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
     11   A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details.
     12 
     13   You should have received a copy of the GNU Affero General Public License along with
     14   TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
     15 */
     16 
     17 use std::{path::PathBuf, time::Duration};
     18 
     19 use config::{Config, parser::ConfigSource};
     20 use tracing::error;
     21 use tracing_subscriber::util::SubscriberInitExt;
     22 
     23 use crate::log::taler_logger;
     24 
     25 pub mod api_common;
     26 pub mod api_params;
     27 pub mod api_revenue;
     28 pub mod api_transfer;
     29 pub mod api_wire;
     30 pub mod bench;
     31 pub mod cli;
     32 pub mod config;
     33 pub mod db;
     34 pub mod error;
     35 pub mod error_code;
     36 pub mod json_file;
     37 pub mod log;
     38 pub mod types;
     39 
     40 #[derive(clap::Parser, Debug, Clone)]
     41 pub struct CommonArgs {
     42     /// Specifies the configuration file
     43     #[clap(long, short)]
     44     #[arg(global = true)]
     45     config: Option<PathBuf>,
     46 
     47     /// Configure logging to use LOGLEVEL
     48     #[clap(long, short('L'))]
     49     #[arg(global = true)]
     50     log: Option<tracing::Level>,
     51 }
     52 
     53 pub fn taler_main(
     54     src: ConfigSource,
     55     args: CommonArgs,
     56     app: impl AsyncFnOnce(Config) -> Result<(), anyhow::Error>,
     57 ) {
     58     taler_logger(args.log).init();
     59     let cfg = match Config::from_file(src, args.config) {
     60         Ok(cfg) => cfg,
     61         Err(err) => {
     62             error!(target: "config", "{}", err);
     63             std::process::exit(1);
     64         }
     65     };
     66 
     67     // Setup async runtime
     68     let runtime = tokio::runtime::Builder::new_multi_thread()
     69         .enable_all()
     70         .build()
     71         .unwrap();
     72 
     73     // Run app
     74     let result = runtime.block_on(app(cfg));
     75     if let Err(err) = result {
     76         error!(target: "cli", "{}", err);
     77         std::process::exit(1);
     78     }
     79 }
     80 
     81 /// Infinite exponential backoff with decorrelated jitter
     82 pub struct ExpoBackoffDecorr {
     83     base: u32,
     84     max: u32,
     85     factor: f32,
     86     sleep: u32,
     87 }
     88 
     89 impl ExpoBackoffDecorr {
     90     pub fn new(base: Duration, max: Duration, factor: f32) -> Self {
     91         Self {
     92             base: base.as_millis() as u32,
     93             max: max.as_millis() as u32,
     94             factor,
     95             sleep: base.as_millis() as u32,
     96         }
     97     }
     98 
     99     pub fn backoff(&mut self) -> Duration {
    100         self.sleep =
    101             rand::random_range(self.base..(self.sleep as f32 * self.factor) as u32).min(self.max);
    102         Duration::from_millis(self.sleep as u64)
    103     }
    104 
    105     pub fn reset(&mut self) {
    106         self.sleep = self.base
    107     }
    108 }
    109 
    110 impl Default for ExpoBackoffDecorr {
    111     fn default() -> Self {
    112         Self::new(Duration::from_millis(400), Duration::from_secs(30), 2.5)
    113     }
    114 }