Debug tool for benchmarking proof-of-work algorithms (#155)

* cmd/anubis: add a debug option for benchmarking hashrate

Having the ability to benchmark different proof-of-work implementations
is useful for extending Anubis. This adds a flag `--debug-benchmark-js`
(and its associated environment variable `DEBUG_BENCHMARK_JS`) for
serving a tool to do so.

Internally, a there is a new policy action, "DEBUG_BENCHMARK", which
serves the benchmarking tool instead of a challenge. The flag then
replaces all bot rules with a special rule matching every request
to that action. The benchmark page makes heavy use of inline styles,
because currently all global styles are shared across all pages. This
could be fixed, but I wanted to avoid major changes to the templates.

* web/js: add signal for aborting an active proof-of-work algorithm

Both proof-of-work algorithms now take an optional `AbortSignal`, which
immediately terminates all workers and returns `false` if aborted before
the challenge is complete.

* web/js: add algorithm comparison to the benchmark page

"Compare:" is added to the benchmark page for testing the relative
performance between two algorithms. Since benchmark runs generally have
high variance, it may take a while for the averages to converge on a
stable difference.

---------

Signed-off-by: Xe Iaso <me@xeiaso.net>
Co-authored-by: Xe Iaso <me@xeiaso.net>

1 files changed, 51 insertions, 0 deletions

diff --git a/web/index.templ b/web/index.templ
index 1899ae3..b43e82c 100644
--- a/web/index.templ
+++ b/web/index.templ
@@ -121,3 +121,54 @@ templ errorPage(message string) {
 		<p><a href="/">Go home</a></p>
 	</div>
 }
+
+templ bench() {
+	<div style="height:20rem;display:flex">
+		<table style="margin-top:1rem;display:grid;grid-template:auto 1fr/auto auto;gap:0 0.5rem">
+			<thead style="border-bottom:1px solid black;padding:0.25rem 0;display:grid;grid-template:1fr/subgrid;grid-column:1/-1">
+				<tr id="table-header" style="display:contents">
+					<th style="width:4.5rem">Time</th>
+					<th style="width:4rem">Iters</th>
+				</tr>
+				<tr id="table-header-compare" style="display:none">
+					<th style="width:4.5rem">Time A</th>
+					<th style="width:4rem">Iters A</th>
+					<th style="width:4.5rem">Time B</th>
+					<th style="width:4rem">Iters B</th>
+				</tr>
+			</thead>
+			<tbody id="results" style="padding-top:0.25rem;display:grid;grid-template-columns:subgrid;grid-auto-rows:min-content;grid-column:1/-1;row-gap:0.25rem;overflow-y:auto;font-variant-numeric:tabular-nums">
+			</tbody>
+		</table>
+		<div class="centered-div">
+			<img
+				id="image"
+				style="width:100%;max-width:256px;"
+				src={ "/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=" +
+	    anubis.Version }
+			/>
+			<p id="status" style="max-width:256px">Loading...</p>
+			<script async type="module" src={ "/.within.website/x/cmd/anubis/static/js/bench.mjs?cacheBuster=" + anubis.Version }></script>
+			<div id="sparkline"></div>
+			<noscript>
+				<p>Running the benchmark tool requires JavaScript to be enabled.</p>
+			</noscript>
+		</div>
+	</div>
+	<form id="controls" style="position:fixed;top:0.5rem;right:0.5rem">
+		<div style="display:flex;justify-content:end">
+			<label for="difficulty-input" style="margin-right:0.5rem">Difficulty:</label>
+			<input id="difficulty-input" type="number" name="difficulty" style="width:3rem"/>
+		</div>
+		<div style="margin-top:0.25rem;display:flex;justify-content:end">
+			<label for="algorithm-select" style="margin-right:0.5rem">Algorithm:</label>
+			<select id="algorithm-select" name="algorithm"></select>
+		</div>
+		<div style="margin-top:0.25rem;display:flex;justify-content:end">
+			<label for="compare-select" style="margin-right:0.5rem">Compare:</label>
+			<select id="compare-select" name="compare">
+			  <option value="NONE">-</option>
+			</select>
+		</div>
+	</form>
+}