Fix CI failing since rustc 1.65.0

Two issues.

1. Backtrace
BT format changed in Rust 1.65, causing
bactrace_util::generate_backtraced_name to return an autogenerated name
created via uuidv4. However, changes applied since then have actually
made the happy path a hard requirement by expecting the resultant string
to be of the form r"(.*)::(.*)::.*". This was the case when the test
names were pulled from BT, but didn't work for autogenerated uuidv4 ones.

This patch removed the uuid name generation from backtrace_util, and
implemented it in mock_node in a different manner.

2. split-debuginfo=unpacked fails on Windows.
Cargo should not forward this option if not supported, but this does not
work in this case. Likely a regression in cargo-rustc interaction. For
now removed this flag with an appropriate remark to get the CI going.

Cargo.toml

@@ -227,5 +227,9 @@ web3 = { git = "https://github.com/golemfactory/rust-web3", branch = "update_eth
 
 # Speed up builds on macOS (will be default in next rust version probably)
 # https://jakedeichert.com/blog/reducing-rust-incremental-compilation-times-on-macos-by-70-percent/
-[profile.dev]
-split-debuginfo = "unpacked"
+#
+# TODO: reenable split-debuginfo.
+# Commented out split-debuginfo makes Windows builds fail due to "`-Csplit-debuginfo=unpacked` is unstable on this platform."
+# This should not be the case (cargo is meant to verify that this option is supported), but it is since version 1.65, I think.
+# [profile.dev]
+# split-debuginfo = "unpacked"

core/market/src/testing/backtrace_util.rs

@@ -21,7 +21,7 @@ fn adjust_backtrace_level(frames: &[backtrace::BacktraceFrame]) -> Option<usize>
 }
 
 fn get_symbol_at_level(bt: &backtrace::Backtrace, lvl: usize) -> Option<String> {
-    let frames = &bt.frames();
+    let frames = bt.frames();
     match adjust_backtrace_level(frames) {
         Some(adjustment) => {
             let frame = &frames[lvl + adjustment];
@@ -34,18 +34,17 @@ fn get_symbol_at_level(bt: &backtrace::Backtrace, lvl: usize) -> Option<String>
     None
 }
 
-pub fn generate_backtraced_name(level: Option<usize>) -> String {
+pub fn generate_backtraced_name(level: Option<usize>) -> Option<String> {
     let bt = backtrace::Backtrace::new();
+
     // 0th element should be this function. We'd like to know the caller
-    if let Some(name) = get_symbol_at_level(&bt, level.unwrap_or(1)) {
+    let name = get_symbol_at_level(&bt, level.unwrap_or(1));
+
+    if let Some(name) = &name {
         log::trace!("Generated name: {} level: {:?} BT: {:#?}", name, level, bt);
-        return name;
+    } else {
+        log::warn!("No backtrace support. bt={:#?}", bt);
     }
-    let u4 = uuid::Uuid::new_v4().to_string();
-    log::error!(
-        "No backtrace support. Generating default name from UUIDv4. uuid4={}, bt={:#?}",
-        u4,
-        bt
-    );
-    u4
+
+    name
 }

core/market/src/testing/mock_node.rs

@@ -105,14 +105,14 @@ impl MockNodeKind {
     }
 }
 
-fn testname_from_backtrace(bn: &str) -> String {
+fn testname_from_backtrace(bn: &str) -> Option<String> {
     log::info!("Test name to regex match: {}", &bn);
     // Extract test name
-    let captures = Regex::new(r"(.*)::(.*)::.*").unwrap().captures(bn).unwrap();
+    let captures = Regex::new(r"(.*)::(.*)::.*").unwrap().captures(bn)?;
     let filename = captures.get(1).unwrap().as_str().to_string();
     let testname = captures.get(2).unwrap().as_str().to_string();
 
-    format!("{}.{}", filename, testname)
+    Some(format!("{}.{}", filename, testname))
 }
 
 impl MarketsNetwork {
@@ -122,19 +122,35 @@ impl MarketsNetwork {
     pub async fn new(test_name: Option<&str>) -> Self {
         std::env::set_var("RUST_LOG", "debug");
         let _ = env_logger::builder().try_init();
-        // level 1 is this function.
-        // level 2 is <core::future::from_generator::GenFuture<T> as
-        // core::future::future::Future>::poll::XXX> (async)
-        // We want to know the caller.
-        let mut bn = crate::testing::backtrace_util::generate_backtraced_name(Some(3));
-        // Special case for mac&windows. Tests are run in adifferent way on those systems and we
-        // have to dive one less level down the stack to find the caller (test_* module).
-        if !bn.starts_with("test_") {
-            bn = crate::testing::backtrace_util::generate_backtraced_name(Some(2));
-        }
-        bn = testname_from_backtrace(&bn);
 
-        let test_name = test_name.unwrap_or(&bn).to_string();
+        let test_name_from_bt = || {
+            // level 1 is this function.
+            // level 2 is <core::future::from_generator::GenFuture<T> as
+            // core::future::future::Future>::poll::XXX> (async)
+            // We want to know the caller.
+            crate::testing::backtrace_util::generate_backtraced_name(Some(3))
+                .and_then(|name| {
+                    // Special case for mac&windows. Tests are run in adifferent way on those systems and we
+                    // have to dive one less level down the stack to find the caller (test_* module).
+                    if !name.starts_with("test_") {
+                        crate::testing::backtrace_util::generate_backtraced_name(Some(2))
+                    } else {
+                        Some(name)
+                    }
+                })
+                .as_deref()
+                .and_then(testname_from_backtrace)
+        };
+
+        let unknown_test_name = || {
+            let nonce = rand::random::<u128>();
+            format!("unknown-test-{:#32x}", nonce)
+        };
+
+        let test_name = test_name
+            .map(String::from)
+            .or_else(test_name_from_bt)
+            .unwrap_or_else(unknown_test_name);
         log::info!("Intializing MarketsNetwork. tn={}", test_name);
 
         MockNet::default().bind_gsb();