The Noderuntime update the current directory of a running app

[BobBlandin]

I write this wrapper for my application to use the capability to running a node script, with the version v3.0.0

public static String runNodeScript(String scriptPath, String mainFunctionName) throws IOException {
		ApplicationProperties bean = SpringContext.getBean(ApplicationProperties.class);
		String nodeScriptsPath = bean.getNodeScriptsPath();

		try (JavetEnginePool<NodeRuntime> javetEnginePool = new JavetEnginePool<NodeRuntime>()) {
			javetEnginePool.getConfig().setJSRuntimeType(JSRuntimeType.Node);

			try (IJavetEngine<NodeRuntime> iJavetEngine = javetEnginePool.getEngine()) {
				NodeRuntime nodeRuntime = iJavetEngine.getV8Runtime();
				NodeModuleProcess nodeModule = nodeRuntime.getNodeModule(NodeModuleProcess.class);
				
				nodeRuntime.getExecutor(new File(nodeScriptsPath + "/" + scriptPath).getAbsoluteFile()).executeVoid();

				return nodeRuntime.getGlobalObject().invokeString(mainFunctionName);
			}
		} catch (JavetException e) {
			logger.error("Error while running node script", e);
			throw new IOException("Error while running node script", e);
		}
	}

The problem, when I ran this method, all code like this does not work anymore (it's trhow an error like "path is not found...")

File testFile = new File("test.txt");
testFile.createNewFile();

I found the cause, that in the library (from my code the "nodeRuntime.getExecutor") there is a "chdir" command executed, and the working directory is never back again.

I have a simple workaround, it's to get the current directory before executing "getExecutor" and restore it after.

public static String runNodeScript(String scriptPath, String mainFunctionName) throws IOException {
		ApplicationProperties bean = SpringContext.getBean(ApplicationProperties.class);
		String nodeScriptsPath = bean.getNodeScriptsPath();

		try (JavetEnginePool<NodeRuntime> javetEnginePool = new JavetEnginePool<NodeRuntime>()) {
			javetEnginePool.getConfig().setJSRuntimeType(JSRuntimeType.Node);

			try (IJavetEngine<NodeRuntime> iJavetEngine = javetEnginePool.getEngine()) {
				NodeRuntime nodeRuntime = iJavetEngine.getV8Runtime();
				NodeModuleProcess nodeModule = nodeRuntime.getNodeModule(NodeModuleProcess.class);
				File currentWorkingDirectory = nodeModule.getWorkingDirectory();
				nodeRuntime.getExecutor(new File(nodeScriptsPath + "/" + scriptPath).getAbsoluteFile()).executeVoid();

				String result = nodeRuntime.getGlobalObject().invokeString(mainFunctionName);

				nodeModule.setWorkingDirectory(currentWorkingDirectory);

				return result;
			}
		} catch (JavetException e) {
			logger.error("Error while running node script", e);
			throw new IOException("Error while running node script", e);
		}
	}

[caoccao]

That's how Node.js works. It needs the working directory to be the one.

In your case, you may do whatever you want to do with the working directory afterwards.