Added reporting on number of cpu cores and available ram

mixnode/src/node/http/hardware.rs

@@ -1,8 +1,17 @@
 use rocket::serde::{json::Json, Serialize};
+use sysinfo::{Cpu, System, SystemExt};
 
 #[derive(Serialize)]
 #[serde(crate = "rocket::serde")]
 pub(crate) struct Hardware {
+    ram: String,
+    num_cores: usize,
+    crypto_hardware: Option<CryptoHardware>,
+}
+
+#[derive(Serialize)]
+#[serde(crate = "rocket::serde")]
+pub(crate) struct CryptoHardware {
     aesni: bool,
     processor: String,
     sgx: bool,
@@ -10,16 +19,37 @@ pub(crate) struct Hardware {
 
 /// Provides hardware information which Nym can use to optimize mixnet speed over time (memory, crypto hardware, CPU, cores, etc).
 #[get("/hardware")]
-pub(crate) fn hardware() -> Json<Option<Hardware>> {
-    if let Some(info) = hardware_info() {
-        Json(Some(info))
-    } else {
-        Json(None)
+pub(crate) fn hardware() -> Json<Hardware> {
+    Json(hardware_info())
+}
+
+/// Gives back a summary report of whatever system hardware info we can get for this platform.
+fn hardware_info() -> Hardware {
+    let crypto_hardware = hardware_info_from_cupid();
+    hardware_from_sysinfo(crypto_hardware)
+}
+
+/// Sysinfo gives back basic stuff like number of CPU cores and available memory. If available, this includes the hardware encryption
+/// extensions report
+fn hardware_from_sysinfo(crypto_hardware: Option<CryptoHardware>) -> Hardware {
+    let mut system = System::new_all();
+    let total_memory = system.free_memory();
+    system.refresh_all();
+    let ram = format!("{}KB", total_memory);
+    let cores = system.cpus();
+    let num_cores = cores.len();
+    Hardware {
+        crypto_hardware,
+        ram,
+        num_cores,
     }
 }
 
-fn hardware_info() -> Option<Hardware> {
-    cupid::master().map(|info| Hardware {
+/// The `cupid` crate gives back a report on available hardware encryption extensions which may be useful for future mixnet optimizations.
+///
+/// Note: this information is generally only available on x86 platforms for Linux.
+fn hardware_info_from_cupid() -> Option<CryptoHardware> {
+    cupid::master().map(|info| CryptoHardware {
         aesni: info.aesni(),
         processor: info.brand_string().unwrap().to_string(),
         sgx: info.sgx(),