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add BLAZINGLY FAST logs

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Toshit Chawda 2025-03-06 20:13:55 -08:00
parent f15cf568c1
commit 9b0af07516
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GPG key ID: 91480ED99E2B3D9D
1 changed files with 87 additions and 65 deletions
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146
src/client/shared/sourcemaps.ts
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@ -1,5 +1,5 @@
import { $scramjet, flagEnabled } from "../../scramjet";
import { ScramjetClient } from "../client";
import { flagEnabled } from "../../scramjet";
import { ProxyCtx, ScramjetClient } from "../client";
enum RewriteType {
Insert = 0,
@ -29,67 +29,9 @@ function getEnd(rewrite: Rewrite): number {
throw "unreachable";
}
const sourcemaps: Record<string, Rewrite[]> = {};
const scramtag_ident = "/*scramtag ";
export const enabled = (client: ScramjetClient) =>
flagEnabled("sourcemaps", client.url);
export default function (client: ScramjetClient, self: Self) {
// every script will push a sourcemap
Object.defineProperty(
self,
globalThis.$scramjet.config.globals.pushsourcemapfn,
{
value: (buf: Array<number>, tag: string) => {
const sourcemap = Uint8Array.from(buf);
const view = new DataView(sourcemap.buffer);
const decoder = new TextDecoder("utf-8");
const rewrites: Rewrite[] = [];
const rewritelen = view.getUint32(0, true);
let cursor = 4;
for (let i = 0; i < rewritelen; i++) {
const type = view.getUint8(cursor) as RewriteType;
cursor += 1;
if (type == RewriteType.Insert) {
const start = view.getUint32(cursor, true);
cursor += 4;
const size = view.getUint32(cursor, true);
cursor += 4;
rewrites.push({ type, start, size });
} else if (type == RewriteType.Replace) {
const start = view.getUint32(cursor, true);
cursor += 4;
const end = view.getUint32(cursor, true);
cursor += 4;
const len = view.getUint32(cursor, true);
cursor += 4;
const str = decoder.decode(
sourcemap.subarray(cursor, cursor + len)
);
rewrites.push({ type, start, end, str });
}
}
sourcemaps[tag] = rewrites;
},
enumerable: false,
writable: false,
configurable: false,
}
);
const scramtag_ident = "/*scramtag ";
// when we rewrite javascript it will make function.toString leak internals
// this can lead to double rewrites which is bad
client.Proxy("Function.prototype.toString", {
apply(ctx) {
function doUnrewrite(ctx: ProxyCtx) {
let stringified: string = ctx.fn.call(ctx.this);
// every function rewritten will have a scramtag comment
@ -156,6 +98,86 @@ export default function (client: ScramjetClient, self: Self) {
newString += stringified.slice(lastpos);
return ctx.return(newString);
}
const sourcemaps: Record<string, Rewrite[]> = {};
export const enabled = (client: ScramjetClient) =>
flagEnabled("sourcemaps", client.url);
export default function (client: ScramjetClient, self: Self) {
// every script will push a sourcemap
Object.defineProperty(
self,
globalThis.$scramjet.config.globals.pushsourcemapfn,
{
value: (buf: Array<number>, tag: string) => {
const sourcemap = Uint8Array.from(buf);
const view = new DataView(sourcemap.buffer);
const decoder = new TextDecoder("utf-8");
const rewrites: Rewrite[] = [];
const rewritelen = view.getUint32(0, true);
let cursor = 4;
for (let i = 0; i < rewritelen; i++) {
const type = view.getUint8(cursor) as RewriteType;
cursor += 1;
if (type == RewriteType.Insert) {
const start = view.getUint32(cursor, true);
cursor += 4;
const size = view.getUint32(cursor, true);
cursor += 4;
rewrites.push({ type, start, size });
} else if (type == RewriteType.Replace) {
const start = view.getUint32(cursor, true);
cursor += 4;
const end = view.getUint32(cursor, true);
cursor += 4;
const len = view.getUint32(cursor, true);
cursor += 4;
const str = decoder.decode(
sourcemap.subarray(cursor, cursor + len)
);
rewrites.push({ type, start, end, str });
}
}
sourcemaps[tag] = rewrites;
},
enumerable: false,
writable: false,
configurable: false,
}
);
// when we rewrite javascript it will make function.toString leak internals
// this can lead to double rewrites which is bad
client.Proxy("Function.prototype.toString", {
apply(ctx) {
const before = performance.now();
doUnrewrite(ctx);
const after = performance.now();
const duration = after - before;
if (flagEnabled("rewriterLogs", new URL(location.href))) {
let timespan: string;
if (duration < 1) {
timespan = "BLAZINGLY FAST";
} else if (duration < 500) {
timespan = "decent speed";
} else {
timespan = "really slow";
}
console.log(
`js unrewrite for function was ${timespan} (${duration.toFixed(2)}ms)`
);
}
},
});
}