nautalid 0.1.0

Scratch container substrate — TLS 1.3 HTTP/2+3 kernel, LID/AetherDB, optional filter bus (GPL-3.0-or-later).
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//! Control-plane commands for tracing / log level.

use kdl::KdlNode;

use crate::bus::{BusModule, response};
use crate::telemetry;

pub struct TelemetryModule;

impl TelemetryModule {
    fn command_node<'a>(
        module_node: &'a KdlNode,
        command_nodes: &[&'a KdlNode],
    ) -> Option<&'a KdlNode> {
        if let Some(cmd) = command_nodes.first() {
            return Some(cmd);
        }
        module_node.children()?.nodes().first()
    }
}

impl BusModule for TelemetryModule {
    fn name(&self) -> &'static str {
        "telemetry"
    }

    fn handle(&self, module_node: &KdlNode, command_nodes: &[&KdlNode]) -> String {
        let Some(cmd) = Self::command_node(module_node, command_nodes) else {
            return response::err("telemetry commands: status, set-level \"…\"");
        };
        match cmd.name().value() {
            "status" => {
                let rust_log = telemetry::current_filter_directive();
                format!("status rust_log=\"{rust_log}\"")
            }
            "set-level" => {
                let Some(level) = cmd.get("level").and_then(|v| v.as_string()) else {
                    return response::err(
                        "set-level requires level=\"info\" (or trace, debug, warn, error)",
                    );
                };
                match telemetry::set_filter_directive(level) {
                    Ok(()) => response::ok("level-updated"),
                    Err(e) => response::err(&e),
                }
            }
            other => response::err(&format!("unknown telemetry command: {other}")),
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use kdl::KdlDocument;

    #[test]
    fn status_reports_filter() {
        let doc: KdlDocument = "telemetry {\n    status\n}".parse().unwrap();
        let node = doc.nodes().first().unwrap();
        let body = TelemetryModule.handle(node, &[]);
        assert!(body.contains("rust_log="));
    }
}