melodium-engine 0.10.0

Mélodium core engine and executor implementation
Documentation 
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use std::sync::OnceLock;
use uuid::Uuid;

static EXECUTION_RUN_ID: OnceLock<Uuid> = OnceLock::new();
static EXECUTION_GROUP_ID: OnceLock<Uuid> = OnceLock::new();

#[allow(unused)]
pub fn set_execution_run_id(uuid: Uuid) -> Result<(), ()> {
    EXECUTION_RUN_ID.set(uuid).map_err(|_| ())
}

#[allow(unused)]
pub fn set_execution_group_id(uuid: Uuid) -> Result<(), ()> {
    EXECUTION_GROUP_ID.set(uuid).map_err(|_| ())
}

pub fn execution_run_id() -> &'static Uuid {
    EXECUTION_RUN_ID.get_or_init(|| {
        std::env::var("MELODIUM_RUN_ID")
            .map(|var| Uuid::parse_str(&var).ok())
            .ok()
            .flatten()
            .unwrap_or_else(|| Uuid::new_v4())
    })
}

pub fn execution_group_id() -> &'static Uuid {
    EXECUTION_GROUP_ID.get_or_init(|| {
        std::env::var("MELODIUM_GROUP_ID")
            .map(|var| Uuid::parse_str(&var).ok())
            .ok()
            .flatten()
            .unwrap_or_else(|| Uuid::new_v4())
    })
}