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src: add utilities to help debugging reproducibility of snapshots
- Print offsets in blob serializer - Add a special node:generate_default_snapshot ID to generate the built-in snapshot. - Improve logging - Add a test to check the reproducibilty of the snapshot PR-URL: #50983 Refs: nodejs/build#3043 Reviewed-By: Daniel Lemire <daniel@lemire.me> Reviewed-By: James M Snell <jasnell@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| 'use strict'; | ||
|
|
||
| require('../common'); | ||
| const { spawnSyncAndAssert } = require('../common/child_process'); | ||
| const tmpdir = require('../common/tmpdir'); | ||
| const fs = require('fs'); | ||
| const assert = require('assert'); | ||
|
|
||
| // When the test fails this helper can be modified to write outputs | ||
| // differently and aid debugging. | ||
| function log(line) { | ||
| console.log(line); | ||
| } | ||
|
|
||
| function generateSnapshot() { | ||
| tmpdir.refresh(); | ||
|
|
||
| spawnSyncAndAssert( | ||
| process.execPath, | ||
| [ | ||
| '--random_seed=42', | ||
| '--predictable', | ||
| '--build-snapshot', | ||
| 'node:generate_default_snapshot', | ||
| ], | ||
| { | ||
| env: { ...process.env, NODE_DEBUG_NATIVE: 'SNAPSHOT_SERDES' }, | ||
| cwd: tmpdir.path | ||
| }, | ||
| { | ||
| stderr(output) { | ||
| const lines = output.split('\n'); | ||
| for (const line of lines) { | ||
| if (line.startsWith('0x')) { | ||
| log(line); | ||
| } | ||
| } | ||
| }, | ||
| } | ||
| ); | ||
| const blobPath = tmpdir.resolve('snapshot.blob'); | ||
| return fs.readFileSync(blobPath); | ||
| } | ||
|
|
||
| const buf1 = generateSnapshot(); | ||
| const buf2 = generateSnapshot(); | ||
|
|
||
| const diff = []; | ||
| let offset = 0; | ||
| const step = 16; | ||
| do { | ||
| const length = Math.min(buf1.length - offset, step); | ||
| const slice1 = buf1.slice(offset, offset + length).toString('hex'); | ||
| const slice2 = buf2.slice(offset, offset + length).toString('hex'); | ||
| if (slice1 !== slice2) { | ||
| diff.push({ offset: '0x' + (offset).toString(16), slice1, slice2 }); | ||
| } | ||
| offset += length; | ||
| } while (offset < buf1.length); | ||
|
|
||
| assert.strictEqual(offset, buf1.length); | ||
| if (offset < buf2.length) { | ||
| const length = Math.min(buf2.length - offset, step); | ||
| const slice2 = buf2.slice(offset, offset + length).toString('hex'); | ||
| diff.push({ offset, slice1: '', slice2 }); | ||
| offset += length; | ||
| } while (offset < buf2.length); | ||
|
|
||
| assert.deepStrictEqual(diff, []); | ||
| assert.strictEqual(buf1.length, buf2.length); |