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tools/split-levels-database.js

@@ -0,0 +1,94 @@
+#!/usr/bin/env node
+/**
+ * 将 levels-database.json 拆为 index + 分片，首屏只下 index（~几 KB）。
+ *
+ * 输出:
+ *   <outDir>/levels-db-index.json (+ .br)
+ *   <outDir>/StreamingAssets/aa/levels-db/<min>-<max>.json (+ .br)
+ */
+const fs = require('fs');
+const path = require('path');
+const { brotliCompressFile, formatBytes } = require('./package-optimize');
+
+const DEFAULT_SHARD_SIZE = 100;
+
+function mkdirp(p) { fs.mkdirSync(p, { recursive: true }); }
+
+/**
+ * @param {string} srcPath  assets/level-data/levels-database.json
+ * @param {string} outDir   运行时包根目录
+ * @param {{ shardSize?: number }} opts
+ */
+function splitLevelsDatabase(srcPath, outDir, opts = {}) {
+  const shardSize = opts.shardSize || DEFAULT_SHARD_SIZE;
+  const raw = JSON.parse(fs.readFileSync(srcPath, 'utf8'));
+  const levels = raw.levels || {};
+  const ids = Object.keys(levels)
+    .map((k) => parseInt(k, 10))
+    .filter((n) => !Number.isNaN(n))
+    .sort((a, b) => a - b);
+
+  if (ids.length < 1) {
+    throw new Error(`关卡库为空: ${srcPath}`);
+  }
+
+  const min = ids[0];
+  const max = ids[ids.length - 1];
+  const shardDir = path.join(outDir, 'StreamingAssets', 'aa', 'levels-db');
+  mkdirp(shardDir);
+
+  const shards = [];
+  for (let start = min; start <= max; start += shardSize) {
+    const end = Math.min(start + shardSize - 1, max);
+    const slice = {};
+    for (const id of ids) {
+      if (id >= start && id <= end) {
+        slice[String(id)] = levels[String(id)];
+      }
+    }
+    if (!Object.keys(slice).length) continue;
+
+    const fileName = `${start}-${end}.json`;
+    const relFile = `levels-db/${fileName}`;
+    const absPath = path.join(shardDir, fileName);
+    fs.writeFileSync(absPath, JSON.stringify({ levels: slice }), 'utf8');
+    const br = brotliCompressFile(absPath, absPath + '.br');
+    console.log(`>>> levels-db/${fileName}: ${formatBytes(br.raw)} → .br ${formatBytes(br.br)}`);
+
+    shards.push({ min: start, max: end, file: relFile, count: Object.keys(slice).length });
+  }
+
+  const index = {
+    version: 2,
+    mode: 'sharded',
+    shardSize,
+    levelIdBase: raw.levelIdBase,
+    generatedAt: raw.generatedAt || new Date().toISOString(),
+    source: raw.source || 'split-levels-database',
+    total: ids.length,
+    min,
+    max,
+    stats: raw.stats,
+    shards,
+  };
+
+  const indexPath = path.join(outDir, 'levels-db-index.json');
+  fs.writeFileSync(indexPath, JSON.stringify(index), 'utf8');
+  const indexBr = brotliCompressFile(indexPath, indexPath + '.br');
+  console.log(`>>> levels-db-index.json: ${formatBytes(indexBr.raw)} → .br ${formatBytes(indexBr.br)}`);
+  console.log(`>>> 关卡库分片: ${shards.length} 片, ${ids.length} 关 (${min}–${max})`);
+
+  return { index, shards, total: ids.length };
+}
+
+module.exports = { splitLevelsDatabase, DEFAULT_SHARD_SIZE };
+
+if (require.main === module) {
+  const src = path.resolve(process.argv[2]);
+  const out = path.resolve(process.argv[3]);
+  if (!src || !out) {
+    console.error('Usage: split-levels-database.js <levels-database.json> <outDir>');
+    process.exit(1);
+  }
+  splitLevelsDatabase(src, out);
+}