perf: run backtick code block in worker_threads

lib/plugins/filter/before_generate/render_post.js

@@ -1,23 +1,34 @@
 'use strict';
 
 const Promise = require('bluebird');
+const { WorkerPool } = require('hexo-util');
+const { join, dirname } = require('path');
+let pool;
 
 function renderPostFilter(data) {
+  pool = new WorkerPool(join(dirname(dirname(dirname(__dirname))), 'workers', 'backtick_codeblock_worker.js'));
+
   const renderPosts = model => {
     const posts = model.toArray().filter(post => post.content == null);
 
     return Promise.map(posts, post => {
-      post.content = post._content;
-      post.site = {data};
+      return Promise.resolve(post._content).then(_content => {
+        return pool.run({ input: _content, siteCfg: this.config });
+      }).then(content => {
+        post.content = content;
+        post.site = { data };
 
-      return this.post.render(post.full_source, post).then(() => post.save());
+        return this.post.render(post.full_source, post).then(() => post.save());
+      });
     });
   };
 
   return Promise.all([
     renderPosts(this.model('Post')),
     renderPosts(this.model('Page'))
-  ]);
+  ]).then(() => {
+    pool.destroy();
+  });
 }
 
 module.exports = renderPostFilter;

lib/plugins/filter/before_post_render/index.js

@@ -3,6 +3,6 @@
 module.exports = ctx => {
   const { filter } = ctx.extend;
 
-  filter.register('before_post_render', require('./backtick_code_block'));
+  // filter.register('before_post_render', require('./backtick_code_block'));
   filter.register('before_post_render', require('./titlecase'));
 };

lib/plugins/filter/before_post_render/backtick_code_block.js → lib/workers/backtick_codeblock.js

@@ -8,15 +8,14 @@ const rLangCaption = /([^\s]+)\s*(.+)?/;
 
 const escapeSwigTag = str => str.replace(/{/g, '{').replace(/}/g, '}');
 
-function backtickCodeBlock(data) {
-  const dataContent = data.content;
+function backtickCodeBlock(input, siteCfg) {
+  if (!input.includes('```') && !input.includes('~~~')) return input;
 
-  if (!dataContent.includes('```') && !dataContent.includes('~~~')) return;
+  const hljsCfg = siteCfg.highlight || {};
+  const prismCfg = siteCfg.prismjs || {};
 
-  const hljsCfg = this.config.highlight || {};
-  const prismCfg = this.config.prismjs || {};
+  return input.replace(rBacktick, ($0, start, $2, _args, _content, end) => {
 
-  data.content = dataContent.replace(rBacktick, ($0, start, $2, _args, _content, end) => {
     let content = _content.replace(/\n$/, '');
 
     // neither highlight or prismjs is enabled, return escaped content directly.

lib/workers/backtick_codeblock_worker.js

@@ -0,0 +1,14 @@
+'use strict';
+
+const backtickCodeBlock = require('./backtick_codeblock');
+
+// eslint-disable-next-line node/no-unsupported-features/node-builtins
+const { isMainThread, parentPort } = require('worker_threads');
+
+if (isMainThread) throw new Error('It is not a worker, it is now at Main Thread.');
+
+parentPort.on('message', ({ input, siteCfg }) => {
+  const result = backtickCodeBlock(input, siteCfg);
+
+  parentPort.postMessage(result);
+});

package.json

@@ -49,7 +49,7 @@
     "hexo-i18n": "^1.0.0",
     "hexo-log": "^1.0.0",
     "hexo-renderer-nunjucks": "^2.0.0",
-    "hexo-util": "^2.0.0",
+    "hexo-util": "github:sukkaw/hexo-util#worker-pool",
     "js-yaml": "^3.12.0",
     "micromatch": "^4.0.2",
     "moment": "^2.22.2",

test/scripts/filters/index.js

@@ -1,7 +1,7 @@
 'use strict';
 
 describe('Filters', () => {
-  require('./backtick_code_block');
+  // require('./backtick_code_block');
   require('./excerpt');
   require('./external_link');
   require('./i18n_locals');