0.3.18 (app only): the clock sample asks igneum_getExecStatus first and takes no block from a follower without a record (ledger N7)

A node before 0.3.18's exec RPC fix dies on eth_getBlockByNumber when its exec follower holds no record (rpc.rs indexes records[0] on an empty vector; the panic hook exits the process), and this sample ran every 9 s once blocks arrived, so a fresh install's IBD and PC 1's restart crash-looped. The sample now waits for executedTipHash. No node change; the pin stays at 5899f603. Version 0.3.18 on the 0.3.17 app tree.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

app/igneum-app/Cargo.lock

@@ -219,7 +219,7 @@ dependencies = [
 
 [[package]]
 name = "igneum-app"
-version = "0.3.17"
+version = "0.3.18"
 dependencies = [
  "ed25519-dalek",
  "getrandom",

app/igneum-app/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "igneum-app"
-version = "0.3.17"
+version = "0.3.18"
 edition = "2021"
 description = "Igneum Miner engine: supervises the node, the miner and the GPU workers, and serves the dashboard on 127.0.0.1"
 license = "MIT"

app/igneum-app/resources/igneum-app.rc

@@ -6,8 +6,8 @@
 1 ICON "igneum.ico"
 
 1 VERSIONINFO
-FILEVERSION     0,3,17,0
+FILEVERSION     0,3,18,0
-PRODUCTVERSION  0,3,17,0
+PRODUCTVERSION  0,3,18,0
 FILEFLAGSMASK   0x3fL
 FILEFLAGS       0x0L
 FILEOS          VOS_NT_WINDOWS32
@@ -20,12 +20,12 @@ BEGIN
         BEGIN
             VALUE "CompanyName",      "Igneum"
             VALUE "FileDescription",  "Igneum Miner engine"
-            VALUE "FileVersion",      "0.3.17"
+            VALUE "FileVersion",      "0.3.18"
             VALUE "InternalName",     "igneum-app"
             VALUE "LegalCopyright",   "Igneum contributors"
             VALUE "OriginalFilename", "igneum-app.exe"
             VALUE "ProductName",      "Igneum Miner"
-            VALUE "ProductVersion",   "0.3.17"
+            VALUE "ProductVersion",   "0.3.18"
         END
     END
     BLOCK "VarFileInfo"

app/igneum-app/src/update.rs

@@ -40,9 +40,36 @@ fn days_from_civil(y: i64, m: i64, d: i64) -> i64 {
     era * 146_097 + doe - 719_468
 }
 
+/// True once the node's exec follower holds a record (igneum_getExecStatus's executedTipHash is set). Any error or an
+/// unreachable node reads false: the block sample waits rather than asks.
+fn exec_has_record(evm_port: u16) -> bool {
+    let body = "{\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"igneum_getExecStatus\",\"params\":[]}";
+    let out = crate::detect::run_timeout(
+        Command::new(crate::platform::tool("curl")).args(["-s", "--max-time", "5", "-X", "POST", &format!("http://127.0.0.1:{evm_port}"), "-H", "Content-Type: application/json", "-d", body]),
+        None,
+        Duration::from_secs(7),
+    );
+    out.as_deref().map(exec_status_has_record).unwrap_or(false)
+}
+
+/// The reading of an igneum_getExecStatus reply: a record is held when executedTipHash is a non-null string.
+pub fn exec_status_has_record(reply: &str) -> bool {
+    serde_json::from_str::<serde_json::Value>(reply)
+        .ok()
+        .and_then(|v| v.get("result")?.get("executedTipHash")?.as_str().map(|h| !h.is_empty()))
+        .unwrap_or(false)
+}
+
 /// The latest block's timestamp (unix seconds) from the node's Ethereum JSON-RPC (the execution layer mirrors the
 /// consensus block times). The first clock source: local time against what the peers produced.
 pub fn latest_block_time(evm_port: u16) -> Option<f64> {
+    // 0.3.18 (ledger N7, 7 October 2026): a node whose exec follower holds no record yet dies on eth_getBlockByNumber
+    // (rpc.rs indexes records[0] on an empty vector and the panic hook exits the process). The nodes before 0.3.18's
+    // fix are live on every machine, and this sample runs every 9 s once blocks arrive, so it asks igneum_getExecStatus
+    // first (it indexes nothing) and takes no block until the follower reports an executed tip.
+    if !exec_has_record(evm_port) {
+        return None;
+    }
     let body = "{\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"eth_getBlockByNumber\",\"params\":[\"latest\",false]}";
     let out = crate::detect::run_timeout(
         Command::new(crate::platform::tool("curl")).args(["-s", "--max-time", "5", "-X", "POST", &format!("http://127.0.0.1:{evm_port}"), "-H", "Content-Type: application/json", "-d", body]),
@@ -56,6 +83,15 @@ pub fn latest_block_time(evm_port: u16) -> Option<f64> {
 
 #[cfg(test)]
 mod tests {
+    /// Ledger N7: the clock sample must not ask eth_getBlockByNumber of a follower with no record
+    #[test]
+    fn exec_status_gate() {
+        assert!(super::exec_status_has_record(r#"{"jsonrpc":"2.0","id":1,"result":{"executedTip":"0x38a5","executedTipHash":"0xa3ae37ec31b9227c3855a1b25ba50ee9f6815bf00b0befcc8836b430baf04343"}}"#));
+        assert!(!super::exec_status_has_record(r#"{"jsonrpc":"2.0","id":1,"result":{"executedTip":"0x0","executedTipHash":null}}"#));
+        assert!(!super::exec_status_has_record(r#"{"jsonrpc":"2.0","id":1,"error":{"code":-32601,"message":"method not found"}}"#));
+        assert!(!super::exec_status_has_record(""));
+        assert!(!super::exec_status_has_record("not json"));
+    }
     #[test]
     fn http_date() {
         assert_eq!(super::parse_http_date("Sun, 04 Oct 2026 11:17:47 GMT"), Some(1_791_112_667.0));

app/windows/version.h

@@ -3,6 +3,6 @@
 // packaging/windows/Igneum-Miner.iss when the app version moves. Include guards, not #pragma once: rc.exe reads it too.
 #ifndef IGNEUM_HOST_VERSION_H
 #define IGNEUM_HOST_VERSION_H
-#define IGNEUM_HOST_VERSION_STR "0.3.17"
+#define IGNEUM_HOST_VERSION_STR "0.3.18"
-#define IGNEUM_HOST_VERSION_RC  0,3,17,0
+#define IGNEUM_HOST_VERSION_RC  0,3,18,0
 #endif

packaging/mac/app/Info.plist

@@ -11,7 +11,7 @@
 	<key>CFBundleVersion</key>
 	<string>VERSION_STAMP</string>
 	<key>CFBundleShortVersionString</key>
-	<string>0.3.17</string>
+	<string>0.3.18</string>
 	<key>CFBundlePackageType</key>
 	<string>APPL</string>
 	<key>CFBundleExecutable</key>

packaging/windows/Igneum-Miner.iss

@@ -9,7 +9,7 @@
   #define ArtDir "..\..\brand\icons"
 #endif
 #ifndef AppVersion
-  #define AppVersion "0.3.17"
+  #define AppVersion "0.3.18"
 #endif
 #define AppName "Igneum Miner"
 #define Publisher "Igneum"