launcher/src/pre_serve.rs

//! Types for the `before_serve` configuration and `exec_aliases` table.
//!
//! Lives outside `config.rs` so the latter stays under the 500-line limit
//! the project enforces (see AGENTS.md).

use serde::Deserialize;

/// Behaviour on a non-zero exit code for a [`PreServeCommand`].
#[derive(Clone, Copy, Debug, PartialEq, Eq, Default, Deserialize)]
#[serde(rename_all = "lowercase")]
pub enum OnFailure {
    #[default]
    Abort,
    Warn,
    Continue,
}

/// One entry in a `before_serve` block.
#[derive(Clone, Debug, Deserialize)]
#[serde(untagged)]
pub enum PreServeCommand {
    Bare(String),
    Configured {
        command: String,
        #[serde(default)]
        on_failure: OnFailure,
    },
}

impl PreServeCommand {
    pub fn command(&self) -> &str {
        match self {
            PreServeCommand::Bare(c) => c,
            PreServeCommand::Configured { command, .. } => command,
        }
    }

    pub fn on_failure(&self) -> OnFailure {
        match self {
            PreServeCommand::Bare(_) => OnFailure::default(),
            PreServeCommand::Configured { on_failure, .. } => *on_failure,
        }
    }
}

#[derive(Clone, Debug, Default, Deserialize)]
pub struct BeforeServeTable {
    #[serde(default)]
    pub commands: Vec<PreServeCommand>,
}

#[derive(Clone, Debug, Default, Deserialize)]
pub struct ModsTable {
    #[serde(default)]
    pub commands: Vec<PreServeCommand>,
}

/// Distributed execution backend — `mp`, `ray`, or absent (single-node).
/// Defaults to [`None_`] when not specified in the recipe.
#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, Deserialize)]
#[serde(rename_all = "lowercase")]
pub enum DistributedBackend {
    Mp,
    Ray,
    #[default]
    None_,
}

impl std::fmt::Display for DistributedBackend {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            DistributedBackend::Mp => write!(f, "mp"),
            DistributedBackend::Ray => write!(f, "ray"),
            DistributedBackend::None_ => write!(f, "none"),
        }
    }
}