Add live log buffering support and endpoint; enhance log display functionality.

Software/MainBoard/rust/src/webserver/get_log.rs

@@ -1,7 +1,10 @@
 use crate::fat_error::FatResult;
 use crate::log::LOG_ACCESS;
+use alloc::string::String;
+use alloc::vec::Vec;
 use edge_http::io::server::Connection;
 use edge_nal::io::{Read, Write};
+use serde::Serialize;
 
 pub(crate) async fn get_log<T, const N: usize>(
     conn: &mut Connection<'_, T, N>,
@@ -34,3 +37,29 @@ where
     conn.write_all("]".as_bytes()).await?;
     Ok(Some(200))
 }
+
+#[derive(Serialize)]
+struct LiveLogEntry {
+    seq: u64,
+    text: String,
+}
+
+#[derive(Serialize)]
+struct LiveLogResponse {
+    entries: Vec<LiveLogEntry>,
+    dropped: bool,
+    next_seq: u64,
+}
+
+pub(crate) async fn get_live_log(after: Option<u64>) -> FatResult<Option<String>> {
+    let (raw_entries, dropped, next_seq) = crate::log::INTERCEPTOR.get_live_logs(after);
+    let response = LiveLogResponse {
+        entries: raw_entries
+            .into_iter()
+            .map(|(seq, text)| LiveLogEntry { seq, text })
+            .collect(),
+        dropped,
+        next_seq,
+    };
+    Ok(Some(serde_json::to_string(&response)?))
+}