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use eyre::{Context as _, Result};
use crate::machine::Machine;
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum ExecutionNode {
Frontend,
Machine(Machine),
Unknown,
}
#[derive(Debug, Clone)]
pub struct Context {
pub node: ExecutionNode,
job_id: Option<u32>,
frontend_hostname: Option<String>,
}
impl Context {
pub async fn new(job_id: Option<u32>, frontend_hostname: Option<String>) -> Result<Self> {
Ok(Self {
node: get_execution_node().await?,
job_id,
frontend_hostname,
})
}
pub fn job_id(&self) -> Result<u32> {
self.job_id.ok_or_else(|| eyre::eyre!("missing job id"))
}
pub fn frontend_hostname(&self) -> Result<&str> {
self.frontend_hostname
.as_deref()
.ok_or_else(|| eyre::eyre!("missing frontend hostname"))
}
}
async fn get_execution_node() -> Result<ExecutionNode> {
let hostname = get_hostname().await?;
let node = match hostname.as_str() {
"frontend" => ExecutionNode::Frontend,
_ => match Machine::from_hostname(&hostname) {
Some(machine) => ExecutionNode::Machine(machine),
_ => ExecutionNode::Unknown,
},
};
Ok(node)
}
async fn get_hostname() -> Result<String> {
if let Ok(hostname) = tokio::fs::read_to_string("/etc/hostname").await {
Ok(hostname)
} else {
std::env::var("HOSTNAME").context("reading HOSTNAME env var")
}
}
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