update webpack and yarn builders

Updating the WebPack and Yarn builders so that they do not launch simultaneously. Compiling some modules simultaneously causes conflicts/crashes

resources/[system]/[builders]/webpack/webpack_builder.js

@@ -2,7 +2,9 @@ const fs = require('fs');
 const path = require('path');
 const workerFarm = require('worker-farm');
 const async = require('async');
-
+let buildingInProgress = false;
+let currentBuildingModule = '';
+let currentBuildingScript = '';
 const webpackBuildTask = {
     shouldBuild(resourceName) {
         const numMetaData = GetNumResourceMetadata(resourceName, 'webpack_config');
@@ -23,7 +25,7 @@ const webpackBuildTask = {
             const cachePath = `cache/${resourceName}/${config.replace(/\//g, '_')}.json`;
 
             try {
-				return JSON.parse(fs.readFileSync(cachePath, { encoding: 'utf8' }));
+                return JSON.parse(fs.readFileSync(cachePath, {encoding: 'utf8'}));
             } catch {
                 return null;
             }
@@ -66,21 +68,23 @@ const webpackBuildTask = {
     },
 
     build(resourceName, cb) {
+        let buildWebpack = async () => {
+            let error = null;
             const configs = [];
             const numMetaData = GetNumResourceMetadata(resourceName, 'webpack_config');
 
             for (let i = 0; i < numMetaData; i++) {
                 configs.push(GetResourceMetadata(resourceName, 'webpack_config', i));
             }
-	
+            for (const configName of configs) {
-		async.forEachOf(configs, (configName, i, acb) => {
                 const configPath = GetResourcePath(resourceName) + '/' + configName;
 
                 const cachePath = `cache/${resourceName}/${configName.replace(/\//g, '_')}.json`;
 
                 try {
                     fs.mkdirSync(path.dirname(cachePath));
-			} catch {}
+                } catch {
+                }
 
                 const config = require(configPath);
 
@@ -89,6 +93,13 @@ const webpackBuildTask = {
                 if (config) {
                     const resourcePath = path.resolve(GetResourcePath(resourceName));
 
+                    while (buildingInProgress) {
+                        console.log(`webpack is busy by another process: we are waiting to compile  ${resourceName} (${configName})`);
+                        await sleep(3000);
+                    }
+                    buildingInProgress = true;
+                    currentBuildingModule = resourceName;
+                    currentBuildingScript = configName;
                     workers({
                         configPath,
                         resourcePath,
@@ -102,7 +113,11 @@ const webpackBuildTask = {
                                 console.error(err.details);
                             }
 
-						acb("worker farm webpack errored out");
+                            buildingInProgress = false;
+                            currentBuildingModule = '';
+                            currentBuildingScript = '';
+                            error = "worker farm webpack errored out";
+                            console.error("worker farm webpack errored out");
                             return;
                         }
 
@@ -110,30 +125,32 @@ const webpackBuildTask = {
                             for (const error of outp.errors) {
                                 console.log(error);
                             }
-						acb("webpack got an error");
+                            buildingInProgress = false;
+                            currentBuildingModule = '';
+                            currentBuildingScript = '';
+                            error = "webpack got an error";
+                            console.error("webpack got an error");
                             return;
                         }
 
                         console.log(`${resourceName}: built ${configName}`);
 
-					acb();
+                        buildingInProgress = false;
-				});
+                        currentBuildingModule = '';
-				
+                        currentBuildingScript = '';
-				return;
-			}
-			
-			acb("no configuration");
-		}, (err) => {
-			setImmediate(() => {
-				if (err) {
-					cb(false, err);
-					return;
-				}
-				
-				cb(true);
-			});
                     });
                 }
+            }
+            if (error) {
+                cb(false, error);
+            } else cb(true);
+        };
+        buildWebpack().then();
+    }
+};
+
+function sleep(ms) {
+    return new Promise(resolve => setTimeout(resolve, ms));
 }
 
 RegisterResourceBuildTaskFactory('z_webpack', () => webpackBuildTask);

resources/[system]/[builders]/yarn/yarn_builder.js

@@ -1,6 +1,8 @@
 const path = require('path');
 const fs = require('fs');
 const child_process = require('child_process');
+let buildingInProgress = false;
+let currentBuildingModule = '';
 
 const yarnBuildTask = {
 	shouldBuild(resourceName) {
@@ -30,6 +32,13 @@ const yarnBuildTask = {
 	},
 	
 	build(resourceName, cb) {
+		let buildYarn = async () => {
+			while (buildingInProgress) {
+				console.log(`yarn is busy by another process: we are waiting to compile  ${resourceName}`);
+				await sleep(3000);
+			}
+			buildingInProgress = true;
+			currentBuildingModule = resourceName;
 			const process = child_process.fork(
 				require.resolve('./yarn_cli.js'),
 				['install'],
@@ -40,6 +49,8 @@ const yarnBuildTask = {
 			process.on('exit', (code, signal) => {
 				setImmediate(() => {
 					if (code != 0 || signal) {
+						buildingInProgress = false;
+						currentBuildingModule = '';
 						cb(false, 'yarn failed!');
 						return;
 					}
@@ -53,10 +64,17 @@ const yarnBuildTask = {
 
 					}
 
+					buildingInProgress = false;
+					currentBuildingModule = '';
 					cb(true);
 				});
 			});
+		};
+		buildYarn().then();
 	}
-}
+};
 
+function sleep(ms) {
+	return new Promise(resolve => setTimeout(resolve, ms));
+}
 RegisterResourceBuildTaskFactory('yarn', () => yarnBuildTask);