Disable metrics server for wasm

Cargo.lock

@@ -3088,25 +3088,6 @@ dependencies = [
  "tracing",
 ]
 
-[[package]]
-name = "h2"
-version = "0.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "51ee2dd2e4f378392eeff5d51618cd9a63166a2513846bbc55f21cfacd9199d4"
-dependencies = [
- "bytes",
- "fnv",
- "futures-core",
- "futures-sink",
- "futures-util",
- "http 1.1.0",
- "indexmap 2.0.2",
- "slab",
- "tokio",
- "tokio-util",
- "tracing",
-]
-
 [[package]]
 name = "half"
 version = "1.8.2"
@@ -3431,7 +3412,7 @@ dependencies = [
  "futures-channel",
  "futures-core",
  "futures-util",
- "h2 0.3.21",
+ "h2",
  "http 0.2.9",
  "http-body 0.4.5",
  "httparse",
@@ -3454,7 +3435,6 @@ dependencies = [
  "bytes",
  "futures-channel",
  "futures-util",
- "h2 0.4.3",
  "http 1.1.0",
  "http-body 1.0.0",
  "httparse",
@@ -3463,7 +3443,6 @@ dependencies = [
  "pin-project-lite 0.2.13",
  "smallvec",
  "tokio",
- "want",
 ]
 
 [[package]]
@@ -3499,7 +3478,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ca38ef113da30126bbff9cd1705f9273e15d45498615d138b0c20279ac7a76aa"
 dependencies = [
  "bytes",
- "futures-channel",
  "futures-util",
  "http 1.1.0",
  "http-body 1.0.0",
@@ -3507,9 +3485,6 @@ dependencies = [
  "pin-project-lite 0.2.13",
  "socket2 0.5.4",
  "tokio",
- "tower",
- "tower-service",
- "tracing",
 ]
 
 [[package]]
@@ -8135,7 +8110,7 @@ dependencies = [
  "encoding_rs",
  "futures-core",
  "futures-util",
- "h2 0.3.21",
+ "h2",
  "http 0.2.9",
  "http-body 0.4.5",
  "hyper 0.14.27",
@@ -10075,7 +10050,7 @@ dependencies = [
  "bytes",
  "futures-core",
  "futures-util",
- "h2 0.3.21",
+ "h2",
  "http 0.2.9",
  "http-body 0.4.5",
  "hyper 0.14.27",

common/client-core/Cargo.toml

@@ -31,11 +31,6 @@ tokio = { workspace = true, features = ["macros"] }
 time = "0.3.17"
 zeroize = { workspace = true }
 
-# For serving metrics
-hyper = { version = "1", features = ["full"] }
-http-body-util = "0.1"
-hyper-util = { version = "0.1", features = ["full"] }
-
 # internal
 nym-bandwidth-controller = { path = "../bandwidth-controller" }
 nym-config = { path = "../config" }
@@ -54,6 +49,19 @@ nym-credential-storage = { path = "../credential-storage" }
 nym-network-defaults = { path = "../network-defaults" }
 si-scale = "0.2.2"
 
+### For serving prometheus metrics
+[target."cfg(not(target_arch = \"wasm32\"))".dependencies.hyper]
+version = "1.2"
+features = ["server", "http1"]
+
+[target."cfg(not(target_arch = \"wasm32\"))".dependencies.http-body-util]
+version = "0.1"
+
+[target."cfg(not(target_arch = \"wasm32\"))".dependencies.hyper-util]
+version = "0.1"
+features = ["tokio"]
+###
+
 [target."cfg(not(target_arch = \"wasm32\"))".dependencies.tokio-stream]
 version = "0.1.11"
 features = ["time"]

common/client-core/src/client/packet_statistics_control.rs

@@ -8,14 +8,23 @@ use nym_metrics::{inc, inc_by, metrics};
 use si_scale::helpers::bibytes2;
 
 // Metrics server
+#[cfg(not(all(target_arch = "wasm32", target_os = "unknown")))]
 use http_body_util::Full;
+#[cfg(not(all(target_arch = "wasm32", target_os = "unknown")))]
 use hyper::body::Bytes;
+#[cfg(not(all(target_arch = "wasm32", target_os = "unknown")))]
 use hyper::server::conn::http1;
+#[cfg(not(all(target_arch = "wasm32", target_os = "unknown")))]
 use hyper::service::service_fn;
+#[cfg(not(all(target_arch = "wasm32", target_os = "unknown")))]
 use hyper::{Request, Response};
+#[cfg(not(all(target_arch = "wasm32", target_os = "unknown")))]
 use hyper_util::rt::TokioIo;
+#[cfg(not(all(target_arch = "wasm32", target_os = "unknown")))]
 use std::convert::Infallible;
+#[cfg(not(all(target_arch = "wasm32", target_os = "unknown")))]
 use std::net::SocketAddr;
+#[cfg(not(all(target_arch = "wasm32", target_os = "unknown")))]
 use tokio::net::TcpListener;
 
 use crate::spawn_future;
@@ -496,11 +505,18 @@ impl PacketStatisticsControl {
         let snapshot_interval = Duration::from_millis(SNAPSHOT_INTERVAL_MS);
         let mut snapshot_interval = tokio::time::interval(snapshot_interval);
 
-        let metrics_port = 18000;
-        let addr = SocketAddr::from(([0, 0, 0, 0], metrics_port));
-        let listener = TcpListener::bind(addr)
-            .await
-            .expect(&format!("Cannot bind metrics server to {metrics_port}!"));
+        cfg_if::cfg_if! {
+            if #[cfg(all(target_arch = "wasm32", target_os = "unknown"))] {
+                log::warn!("Metrics server is not supported on wasm32-unknown-unknown");
+                let listener = None;
+            } else {
+                let metrics_port = 18000;
+                let addr = SocketAddr::from(([0, 0, 0, 0], metrics_port));
+                let listener = Some(TcpListener::bind(addr)
+                .await
+                .unwrap_or_else(|_ | panic!("Cannot bind metrics server to {metrics_port}!")));
+            }
+        }
 
         loop {
             tokio::select! {
@@ -514,7 +530,8 @@ impl PacketStatisticsControl {
                         break;
                     }
                 },
-                result = listener.accept() => {
+                // conditional will disable the branch if we're in wasm32-unknown-unknown
+                result = listener.as_ref().unwrap().accept(), if listener.is_some() => {
                     if let Ok((stream, _)) = result {
                         let io = TokioIo::new(stream);