workinf_Blender_Wasm/my-tools/diagnose_local_save_stability.mjs

import assert from 'node:assert/strict';
import fs from 'node:fs';
import path from 'node:path';
import crypto from 'node:crypto';
import { fileURLToPath } from 'node:url';
import createEngine from '../build_web_blender6/bin/web_engine.js';

const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..');
const engine = await createEngine({ wasmBinary: fs.readFileSync(path.join(root, 'build_web_blender6/bin/web_engine.wasm')) });
const handle = engine._web_engine_create();
const pointers = engine._malloc(8);
const started = performance.now();
const hash = bytes => crypto.createHash('sha256').update(bytes).digest('hex');
const output = () => {
  const pointer = engine.HEAPU32[pointers / 4];
  const length = engine.HEAPU32[pointers / 4 + 1];
  return { pointer, bytes: engine.HEAPU8.slice(pointer, pointer + length) };
};
const open = file => {
  const bytes = fs.readFileSync(path.join(root, file));
  const pointer = engine._malloc(bytes.length);
  try {
    engine.HEAPU8.set(bytes, pointer);
    assert.equal(engine._web_engine_open_blend(handle, pointer, bytes.length), 0);
  } finally { engine._free(pointer); }
};
const invoke = (cmd, params = {}, ok = true) => {
  const bytes = Buffer.from(JSON.stringify({ cmd, params }));
  const pointer = engine._malloc(bytes.length);
  try {
    engine.HEAPU8.set(bytes, pointer);
    assert.equal(engine._web_engine_call_json(handle, pointer, bytes.length, pointers, pointers + 4), 0);
    const result = JSON.parse(new TextDecoder().decode(output().bytes));
    assert.equal(result.ok, ok, result.error);
  } finally { engine._free(pointer); }
};
const command = (command, ok = true) => invoke('applyCommand', { command }, ok);
const snapshot = () => {
  assert.equal(engine._web_engine_get_scene_snapshot(handle, pointers, pointers + 4), 0);
  return JSON.parse(new TextDecoder().decode(output().bytes));
};
const save = () => {
  assert.equal(engine._web_engine_save_blend(handle, pointers, pointers + 4), 0);
  const result = output();
  engine._web_engine_free_buffer(result.pointer);
  return result.bytes;
};
try {
  open('tests/files/web/nonmesh_scene.blend');
  command({ type: 'createObjectData', objectType: 'EMPTY', name: 'Save Stability Probe' });
  const beforeState = snapshot();
  const font = beforeState.nonMeshData.find(data => data.type === 'FONT');
  assert(font);
  const first = save();
  const savedMemory = engine._web_engine_get_allocated_bytes();
  assert.equal(hash(save()), hash(first), 'unchanged repeated saves must have identical bytes');
  assert.equal(engine._web_engine_get_allocated_bytes(), savedMemory, 'repeated saves must not accumulate retained buffers');
  command({ type: 'setFontLinks', dataId: font.id, links: { regular: 'vfont:MissingLocalFont' } }, false);
  const rejectedState = snapshot();
  assert.equal(rejectedState.revision, beforeState.revision);
  assert.deepEqual(rejectedState.nonMeshData, beforeState.nonMeshData);
  assert.deepEqual(rejectedState.vfonts, beforeState.vfonts);
  const afterFailure = save();
  assert.equal(hash(afterFailure), hash(first), 'a rejected command must preserve saved bytes for the same revision');
  command({ type: 'createObjectData', objectType: 'EMPTY', name: 'Changed Save Probe' });
  const changed = save();
  assert.notEqual(hash(changed), hash(first), 'successful edits must invalidate saved bytes');
  invoke('undo');
  assert(!snapshot().nodes.some(node => node.name === 'Changed Save Probe'));
  assert.notEqual(hash(save()), hash(changed), 'undo must not export the newer cached state');
  invoke('redo');
  assert(snapshot().nodes.some(node => node.name === 'Changed Save Probe'));
  const redone = save();
  assert.equal(hash(save()), hash(redone));
  open('tests/files/web/basic_scene.blend');
  const reopened = save();
  assert.equal(hash(reopened), hash(fs.readFileSync(path.join(root, 'tests/files/web/basic_scene.blend'))),
    'opening a different project must invalidate the saved byte cache');
  open('tests/files/web/nonmesh_scene.blend');
  assert.equal(hash(save()), hash(fs.readFileSync(path.join(root, 'tests/files/web/nonmesh_scene.blend'))));
  console.log(JSON.stringify({ status: 'PASS', seconds: (performance.now() - started) / 1000,
    savedHash: hash(first), afterFailureHash: hash(afterFailure), changedHash: hash(changed) }));
} catch (error) {
  console.log(JSON.stringify({ status: 'FAIL', error: error.message, seconds: (performance.now() - started) / 1000 }));
  process.exitCode = 1;
} finally {
  engine._free(pointers);
  engine._web_engine_destroy(handle);
}