#include "demo_guard.h"

// Fault-injection demo. Under the wasm runtime every unit fault is a guest
// trap that the workspace turns into a clean 500 without harming the worker;
// these modes exercise the three distinct trap causes (mirrors tests/wasm-kill).
u64 error_reporting_recurse(volatile u64 depth)
{
	volatile u64 next = depth + 1;
	return(next + error_reporting_recurse(next));
}

RENDER(Request& context)
{
	if(!test_demo_request_allowed(context))
	{
		test_demo_render_restricted_html(context, "Error reporting", "crash or abort request workers for diagnostics");
		return;
	}
	String mode = context.get["mode"];

	if(mode == "trap")
		__builtin_trap();
	if(mode == "recurse")
	{
		volatile u64 sink = error_reporting_recurse(0);
		(void)sink;
	}
	if(mode == "loop")
	{
		volatile u64 i = 0;
		while(i >= 0)
			i++;
	}

	<>
		<link rel="stylesheet" href='style.css?v=<?= time() ?>'></link>
		<h1>
			<a href="index.uce">UCE Test</a>:
			Error reporting
		</h1>
		<p>These actions trigger guest traps so you can verify that UCE returns a usable `500` response from a healthy worker instead of dropping the upstream connection.</p>
		<ul>
			<li><a href="?mode=trap">Trigger an explicit trap (`__builtin_trap`)</a></li>
			<li><a href="?mode=recurse">Trigger stack exhaustion (unbounded recursion)</a></li>
			<li><a href="?mode=loop">Trigger a runaway loop (epoch interrupt)</a></li>
		</ul>
	</>
}