Add tracer, fix MessageActions slow startup

1 files changed, 63 insertions, 0 deletions

diff --git a/src/debug/Tracer.ts b/src/debug/Tracer.ts
new file mode 100644
index 0000000..86b5786
--- /dev/null
+++ b/src/debug/Tracer.ts
@@ -0,0 +1,63 @@
+/*
+ * Vencord, a modification for Discord's desktop app
+ * Copyright (c) 2022 Vendicated and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+import Logger from "../utils/logger";
+
+if (IS_DEV) {
+    var traces = {} as Record<string, [number, any[]]>;
+    var logger = new Logger("Tracer", "#FFD166");
+}
+
+const noop = function () { };
+
+export const beginTrace = !IS_DEV ? noop :
+    function beginTrace(name: string, ...args: any[]) {
+        if (name in traces)
+            throw new Error(`Trace ${name} already exists!`);
+
+        traces[name] = [performance.now(), args];
+    };
+
+export const finishTrace = !IS_DEV ? noop : function finishTrace(name: string) {
+    const end = performance.now();
+
+    const [start, args] = traces[name];
+    delete traces[name];
+
+    logger.debug(`${name} took ${end - start}ms`, args);
+};
+
+type Func = (...args: any[]) => any;
+type TraceNameMapper<F extends Func> = (...args: Parameters<F>) => string;
+
+const noopTracer =
+    <F extends Func>(name: string, f: F, mapper?: TraceNameMapper<F>) => f;
+
+export const traceFunction = !IS_DEV
+    ? noopTracer
+    : function traceFunction<F extends Func>(name: string, f: F, mapper?: TraceNameMapper<F>): F {
+        return function (this: any, ...args: Parameters<F>) {
+            const traceName = mapper?.(...args) ?? name;
+
+            beginTrace(traceName, ...arguments);
+            const result = f.apply(this, args);
+            finishTrace(traceName);
+
+            return result;
+        } as F;
+    };