Messing with YANG

oc.rs

use std::sync::Arc;
use std::fs::File;
use yang2::context::{Context, ContextFlags};
use yang2::data::{
    Data, DataFormat, DataParserFlags, DataTree,
    DataValidationFlags,
};

static SEARCH_DIR: &str = "/path/to/openconfig/public/";

fn main() -> std::io::Result<()> {
    // Initialize context.
    let mut ctx = Context::new(ContextFlags::NO_YANGLIBRARY)
        .expect("Failed to create context");
    ctx.set_searchdir(SEARCH_DIR)
        .expect("Failed to set YANG search directory");

    // Load YANG modules.
    for module_name in &["openconfig-lldp"] {
        ctx.load_module(module_name, None, &[])
            .expect("Failed to load module");
    }
    let ctx = Arc::new(ctx);

    let dtree = DataTree::parse_file(
        &ctx,
        File::open("/path/to/nxos-lldp.xml")?,
        DataFormat::XML,
        DataParserFlags::empty(),
        DataValidationFlags::empty(),
    )
    .expect("Failed to parse data tree");

    // Iterate over all nodes of the data tree.
    println!("Iterating over all data nodes...");
    for dnode in dtree.traverse() {
        println!("  {}: {:?}", dnode.path(), dnode.value());
    }

    println!("Iterating over subpath only...");
    for dnode in dtree
        .find_xpath("/openconfig-lldp:lldp/interfaces")
        .expect("Failed to find interfaces")
    {
        println!("  {}: {:?}", dnode.path(), dnode.value());
    }

    Ok(())
}