feat(dataplane): set gateway name

Set the gateway name from the cmd line --name argument.
If no --name is provided, set the gateway name from the hostname
provided by the OS. Fail to start if the gatway name cannot be set.

With this, the gateway name defaults to the hostname but can always
be overriden with --name.

Signed-off-by: Fredi Raspall <[email protected]>

Author: Fredi-raspall

Cargo.lock

@@ -16,6 +16,7 @@ ctrlc = { workspace = true, features = ["termination"] }
 dpdk = { workspace = true }
 dyn-iter = { workspace = true }
 futures = { workspace = true }
+gwname = { workspace = true }
 hyper = { workspace = true }
 hyper-util = { workspace = true }
 id = { workspace = true }
@@ -26,7 +27,7 @@ mgmt = { workspace = true }
 mio = { workspace = true, features = ["os-ext", "net"] }
 nat = { workspace = true }
 net = { workspace = true, features = ["test_buffer"] }
-nix = { workspace = true }
+nix = { workspace = true, features = ["hostname"] }
 netdev = { workspace = true }
 once_cell = { workspace = true }
 ordermap = { workspace = true, features = ["std"] }

dataplane/Cargo.toml

@@ -16,9 +16,11 @@ use args::{CmdArgs, Parser};
 use drivers::kernel::DriverKernel;
 use mgmt::{ConfigProcessorParams, MgmtParams, start_mgmt};
 
+use nix::unistd::gethostname;
 use pyroscope::PyroscopeAgent;
 use pyroscope_pprofrs::{PprofConfig, pprof_backend};
 
+use gwname::{get_gw_name, set_gw_name};
 use routing::RouterParamsBuilder;
 use tracectl::{custom_target, get_trace_ctl, trace_target};
 
@@ -29,8 +31,26 @@ custom_target!("tonic", LevelFilter::ERROR, &[]);
 custom_target!("h2", LevelFilter::ERROR, &[]);
 custom_target!("Pyroscope", LevelFilter::INFO, &[]);
 
+fn init_name(args: &CmdArgs) -> Result<(), String> {
+    if let Some(name) = args.get_name() {
+        set_gw_name(name)?;
+    } else {
+        let hostname =
+            gethostname().map_err(|errno| format!("Failed to get hostname: {}", errno.desc()))?;
+        let name = hostname
+            .to_str()
+            .ok_or_else(|| format!("Failed to convert hostname {}", hostname.display()))?;
+        set_gw_name(name)?;
+    }
+    Ok(())
+}
 fn init_logging() {
     let tctl = get_trace_ctl();
+    info!(
+        " ━━━━━━ Dataplane for '{}' started ━━━━━━",
+        get_gw_name().unwrap_or_else(|| unreachable!())
+    );
+
     tctl.set_default_level(LevelFilter::DEBUG)
         .expect("Setting default loglevel failed");
 }
@@ -65,9 +85,15 @@ fn process_tracing_cmds(args: &CmdArgs) {
     }
 }
 
+#[allow(clippy::too_many_lines)]
 fn main() {
-    init_logging();
     let args = CmdArgs::parse();
+    if let Err(e) = init_name(&args) {
+        eprintln!("Failed to set gateway name: {e}");
+        std::process::exit(1);
+    }
+    init_logging();
+
     let agent_running = args.pyroscope_url().and_then(|url| {
         match PyroscopeAgent::builder(url.as_str(), "hedgehog-dataplane")
             .backend(pprof_backend(