tools: make doctool work if no internet available

Allow doctool to fallback to use local files if not building a release
build.
Backport-PR-URL: #32642
PR-URL: #30214Fixes: #29918
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>

Author: richardlau

test/internet/test-doctool-versions.js test/doctool/test-doctool-versions.jstest/internet/test-doctool-versions.js renamed to test/doctool/test-doctool-versions.js

@@ -1,21 +1,33 @@
 'use strict';
 
+const{ readFileSync }=require('fs');
+constpath=require('path');
+constsrcRoot=path.join(__dirname,'..','..');
+
 let_versions;
 
+constisRelease=()=>{
+constre=/#defineNODE_VERSION_IS_RELEASE0/;
+constfile=path.join(srcRoot,'src','node_version.h');
+return!re.test(readFileSync(file,{encoding: 'utf8'}));
+};
+
 constgetUrl=(url)=>{
 returnnewPromise((resolve,reject)=>{
 consthttps=require('https');
-constrequest=https.get(url,(response)=>{
+constrequest=https.get(url,{timeout: 5000},(response)=>{
 if(response.statusCode!==200){
 reject(newError(
 `Failed to get ${url}, status code ${response.statusCode}`));
 }
 response.setEncoding('utf8');
 letbody='';
+response.on('aborted',()=>reject());
 response.on('data',(data)=>body+=data);
 response.on('end',()=>resolve(body));
 });
 request.on('error',(err)=>reject(err));
+request.on('timeout',()=>request.abort());
 });
 };
 
@@ -27,10 +39,23 @@ module.exports = {
 
 // The CHANGELOG.md on release branches may not reference newer semver
 // majors of Node.js so fetch and parse the version from the master branch.
-constgithubContentUrl='https://raw.githubusercontent.com/nodejs/node/';
-constchangelog=awaitgetUrl(`${githubContentUrl}/master/CHANGELOG.md`);
+consturl=
+'https://raw.githubusercontent.com/nodejs/node/master/CHANGELOG.md';
+letchangelog;
+try{
+changelog=awaitgetUrl(url);
+}catch(e){
+// Fail if this is a release build, otherwise fallback to local files.
+if(isRelease()){
+throwe;
+}else{
+constfile=path.join(srcRoot,'CHANGELOG.md');
+console.warn(`Unable to retrieve ${url}. Falling back to ${file}.`);
+changelog=readFileSync(file,{encoding: 'utf8'});
+}
+}
 constltsRE=/LongTermSupport/i;
-constversionRE=/\*\[Node\.js([0-9.]+)\][^-—]+[-—]\s*(.*)\n/g;
+constversionRE=/\*\[Node\.js([0-9.]+)\][^-—]+[-—]\s*(.*)\r?\n/g;
 _versions=[];
 letmatch;
 while((match=versionRE.exec(changelog))!=null){