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use eyre::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>,
infer_job_id: bool,
frontend_hostname: Option<String>,
}
impl Context {
pub async fn new(
job_id: Option<u32>,
infer_job_id: bool,
frontend_hostname: Option<String>,
) -> Result<Self> {
Ok(Self {
node: get_execution_node().await?,
job_id,
infer_job_id,
frontend_hostname,
})
}
pub async fn job_id(&self) -> Result<u32> {
tracing::debug!("obtaining job id");
if let Some(job_id) = self.job_id {
tracing::debug!("job id was set, using {job_id}");
Ok(job_id)
} else if self.infer_job_id {
tracing::debug!("job id was not set but inference is enabled, finding job id");
let job_ids = crate::oar::list_user_job_ids(self).await?;
match job_ids.len() {
0 => Err(eyre::eyre!("cannot infer job id, no jobs are running")),
1 => Ok(job_ids[0]),
_ => Err(eyre::eyre!(
"cannot infer job id, multiple jobs are running"
)),
}
} else {
tracing::debug!("inference was disabled and job id is not set");
Err(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() -> String {
let hostname = if let Ok(hostname) = tokio::fs::read_to_string("/etc/hostname").await {
hostname
} else if let Ok(hostname) = std::env::var("HOSTNAME") {
hostname
} else {
tracing::warn!("unable to obtain hostname, using empty string");
String::default()
};
hostname.trim().to_string()
}
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