git-next/src/server/mod.rs

mod actors;
mod config;

use actix::prelude::*;

use std::path::PathBuf;

use tracing::{error, info};

use crate::{
    filesystem::FileSystem,
    server::config::{Forge, ForgeName, RepoName},
};

use self::{actors::repo::RepoActor, config::Repo};

pub fn init(fs: FileSystem) {
    let file_name = "git-next-server.toml";
    let path = PathBuf::from(file_name);
    if fs.file_exists(&path) {
        eprintln!(
            "The configuration file already exists at {} - not overwritting it.",
            file_name
        );
    } else {
        match fs.write_file(file_name, include_str!("../../server-default.toml")) {
            Ok(_) => println!("Created a default configuration file at {}", file_name),
            Err(e) => {
                eprintln!("Failed to write to the configuration file: {}", e)
            }
        }
    }
}

pub fn start(fs: FileSystem) {
    let Ok(_) = init_logging() else {
        eprintln!("Failed to initialize logging.");
        return;
    };
    info!("Starting Server...");
    let config = match config::ServerConfig::load(&fs) {
        Ok(config) => config,
        Err(err) => {
            error!("Failed to load config file. Error: {}", err);
            return;
        }
    };

    info!("Config loaded");
    let actors = config
        .forges()
        .flat_map(|(forge_name, forge)| create_forge_repos(forge, forge_name))
        .collect::<Vec<_>>();

    actix::System::new().block_on(async {
        let addresses = actors.into_iter().map(start_actor).collect::<Vec<_>>();
        let _ = actix_rt::signal::ctrl_c().await;
        info!("Ctrl-C received, shutting down...");
        drop(addresses);
    });
}

fn create_forge_repos(
    forge: &Forge,
    forge_name: ForgeName,
) -> Vec<(ForgeName, RepoName, RepoActor)> {
    let forge = forge.clone();
    let span = tracing::info_span!("Forge", %forge_name, %forge);
    let _guard = span.enter();
    info!("Creating Forge");
    forge
        .repos()
        .map(create_actor(forge_name, forge.clone()))
        .collect::<Vec<_>>()
}

fn create_actor(
    forge_name: ForgeName,
    forge: config::Forge,
) -> impl Fn((RepoName, &Repo)) -> (ForgeName, RepoName, RepoActor) {
    move |(repo_name, repo)| {
        let span = tracing::info_span!("Repo", %repo_name, %repo);
        let _guard = span.enter();
        info!("Creating Repo");
        let actor = actors::repo::RepoActor::new(config::RepoDetails::new(
            &repo_name,
            repo,
            &forge_name,
            &forge,
        ));
        info!("Created Repo");
        (forge_name.clone(), repo_name, actor)
    }
}

fn start_actor(
    actor: (ForgeName, RepoName, actors::repo::RepoActor),
) -> Addr<actors::repo::RepoActor> {
    let (forge_name, repo_name, actor) = actor;
    let span = tracing::info_span!("Forge/Repo", %forge_name, %repo_name);
    let _guard = span.enter();
    info!("Starting");
    let addr = actor.start();
    addr.do_send(actors::repo::StartRepo);
    info!("Started");
    addr
}

pub fn init_logging() -> Result<(), tracing::subscriber::SetGlobalDefaultError> {
    use tracing_subscriber::prelude::*;

    let console_layer = console_subscriber::ConsoleLayer::builder().spawn();

    let subscriber = tracing_subscriber::fmt::layer()
        // NOTE: set RUSTLOG in ${root}/.cargo/config
        .with_target(false)
        .with_file(true)
        .with_line_number(true);
    tracing_subscriber::registry()
        .with(console_layer)
        .with(subscriber)
        .init();
    Ok(())
}