improve debug memory-stats options

Signed-off-by: Jason Volk <jason@zemos.net>

src/admin/debug/commands.rs

@@ -843,19 +843,27 @@ pub(super) async fn resolve_true_destination(
 }
 
 #[admin_command]
-pub(super) async fn memory_stats(&self) -> Result<RoomMessageEventContent> {
-	let html_body = conduwuit::alloc::memory_stats();
+pub(super) async fn memory_stats(&self, opts: Option<String>) -> Result<RoomMessageEventContent> {
+	const OPTS: &str = "abcdefghijklmnopqrstuvwxyz";
 
-	if html_body.is_none() {
-		return Ok(RoomMessageEventContent::text_plain(
-			"malloc stats are not supported on your compiled malloc.",
-		));
-	}
+	let opts: String = OPTS
+		.chars()
+		.filter(|&c| {
+			let allow_any = opts.as_ref().is_some_and(|opts| opts == "*");
 
-	Ok(RoomMessageEventContent::text_html(
-		"This command's output can only be viewed by clients that render HTML.".to_owned(),
-		html_body.expect("string result"),
-	))
+			let allow = allow_any || opts.as_ref().is_some_and(|opts| opts.contains(c));
+
+			!allow
+		})
+		.collect();
+
+	let stats = conduwuit::alloc::memory_stats(&opts).unwrap_or_default();
+
+	self.write_str("```\n").await?;
+	self.write_str(&stats).await?;
+	self.write_str("\n```").await?;
+
+	Ok(RoomMessageEventContent::text_plain(""))
 }
 
 #[cfg(tokio_unstable)]

src/admin/debug/mod.rs

@@ -191,7 +191,13 @@ pub(super) enum DebugCommand {
 	},
 
 	/// - Print extended memory usage
-	MemoryStats,
+	///
+	/// Optional argument is a character mask (a sequence of characters in any
+	/// order) which enable additional extended statistics. Known characters are
+	/// "abdeglmx". For convenience, a '*' will enable everything.
+	MemoryStats {
+		opts: Option<String>,
+	},
 
 	/// - Print general tokio runtime metric totals.
 	RuntimeMetrics,

src/core/alloc/default.rs

@@ -5,7 +5,7 @@ pub fn trim() -> crate::Result { Ok(()) }
 
 /// Always returns None
 #[must_use]
-pub fn memory_stats() -> Option<String> { None }
+pub fn memory_stats(_opts: &str) -> Option<String> { None }
 
 /// Always returns None
 #[must_use]

src/core/alloc/hardened.rs

@@ -7,9 +7,9 @@ pub fn trim() -> crate::Result { Ok(()) }
 
 #[must_use]
 //TODO: get usage
-pub fn memory_usage() -> Option<string> { None }
+pub fn memory_usage() -> Option<String> { None }
 
 #[must_use]
-pub fn memory_stats() -> Option<String> {
+pub fn memory_stats(_opts: &str) -> Option<String> {
 	Some("Extended statistics are not available from hardened_malloc.".to_owned())
 }

src/core/alloc/je.rs

@@ -3,7 +3,7 @@
 use std::{
 	cell::OnceCell,
 	ffi::{c_char, c_void},
-	fmt::{Debug, Write},
+	fmt::Debug,
 };
 
 use arrayvec::ArrayVec;
@@ -66,15 +66,12 @@ pub fn memory_usage() -> Option<String> {
 #[cfg(not(feature = "jemalloc_stats"))]
 pub fn memory_usage() -> Option<String> { None }
 
-#[must_use]
-pub fn memory_stats() -> Option<String> {
-	const MAX_LENGTH: usize = 65536 - 4096;
+pub fn memory_stats(opts: &str) -> Option<String> {
+	const MAX_LENGTH: usize = 1_048_576;
 
-	let opts_s = "d";
 	let mut str = String::new();
-
 	let opaque = std::ptr::from_mut(&mut str).cast::<c_void>();
-	let opts_p: *const c_char = std::ffi::CString::new(opts_s)
+	let opts_p: *const c_char = std::ffi::CString::new(opts)
 		.expect("cstring")
 		.into_raw()
 		.cast_const();
@@ -84,7 +81,8 @@ pub fn memory_stats() -> Option<String> {
 	unsafe { ffi::malloc_stats_print(Some(malloc_stats_cb), opaque, opts_p) };
 
 	str.truncate(MAX_LENGTH);
-	Some(format!("<pre><code>{str}</code></pre>"))
+
+	Some(str)
 }
 
 unsafe extern "C" fn malloc_stats_cb(opaque: *mut c_void, msg: *const c_char) {